11525 Sorrento Valley Rd.
San Diego, California 92121
(858) 481-0210
SPECIFICATION SHEET
P600L CURRENT LIMITING FUSE
REVISION: ABCDEFGHJ K
DATE: 11/87 5/90 5/92 7/94 6/95 12/95 6/96 1/97 11/99 12/99
DRAWN: Jeff Montgomery
CHECKED: Yan Ma
APPROVED: Jeff Montgomery
ECN: 2116 SHEET 1 OF 26
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 2 of 26
1. SCOPE
1.1 Scope. This specification establishes the requirements for thick film current limiting fuses.
Fuses described in this document are designed and manufactured for high reliability applications based on
guaranteed blow limits. These fuses are intended for use in direct (DC) and alternating current (AC) circuits and
are capable of operation over a temperature range of –55°C to +125°C ambient including high vacuum
environments.
2. LOT ACCEPTANCE TESTING
2.1 Lot Acceptance Testing. This specification provides for two acceptance levels for the
procurement of fuses. The degree of testing and associated documentation can be specified as appropriate to
the end use of the fuses. Regardless of the acceptance level specified, the inherent quality and reliability of the
fuses will remain constant. The acceptance levels with the applicable inspection required are indicated in Table I.
TABLE I. LOT ACCEPTANCE LEVEL.
3. APPLICABLE DOCUMENTS
3.1 Issues of Documents. The following specifications, standards and handbooks form a part of this
specification to the extent specified herein. In the event of a conflict between the documents referenced herein
and this specification, this specification governs.
SPECIFICATIONS
MIL-G-45204: Gold Plating Electrodeposited.
MIL-PRF-23419: General Specification for Instrument Type Fuses.
MIL-F14256: Flux, Soldering, Liquid (Rosin Base).
STANDARDS
MIL-STD-202: Test Methods for Electronic and Electrical Component Parts.
MIL-STD-790: Reliability Assurance Program for Electronic Parts Specifications.
MIL-STD-1285: Marking of Electrical and Electronic Parts.
MIL-STD-45662: Calibration System Requirements.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 3 of 26
OTHERS
P600L-PA: Internal Visual Examination (Precap) for Current Limiting Fuses.
P600L-R: Radiographic Inspection for Current Limiting Fuses.
ASTM E595: Materials from Outgassing in a Vacuum Environment, Total Mass Loss
and Collected Volatile Condensable, Standard Test Method for.
4. REQUIREMENTS
4.1 Qualification. Fuses manufactured in accordance with this document shall be capable of passing
the qualification requirements specified in Table V and section 4 of this document.
4.2 Materials, Design and Construction. The materials, design and construction of the fuses shall be
as specified herein (see Figure 6 for flow chart of operations).
4.2.1 Terminals. The lead material shall be CDA-102 copper, plated with gold per MIL-G-45204, Type
II, Grade C, Class 1 with nickel underplate of 50 micro-inches.
4.2.2 Housing. The housing material shall be polyphenylene sulfide (PPS). The PPS material will be
insert molded to form the body of the fuse.
4.3 Voltage Rating. The voltage ratings for fuses specified herein are 50 volts DC, 72 volts DC and
125 volts DC. Nonstandard fuses with voltage ratings of 135 volts DC are also available. The applicable voltage
ratings are specified in Table VI (see note 4 for 135 volt ratings).
4.4 Current Rating. The current rating is the maximum amperes that the fuse will carry at a case
temperature of +25°C without degradation. The applicable current ratings are specified in Table VI.
4.5 Temperature Rating. The temperature rating for fuses specified herein is –55°C to +150°C
nonoperating. The maximum operating temperature shall not exceed a case temperature of +125°C. The
temperature derating curve is given in Figure 5.
4.6 Resistance Rating. The cold resistance of the fuses shall be as specified in Table VI when
measured in accordance with 5.8.2.
4.7 Marking. Fuses shall be marked in accordance with Method I of MIL-STD-1285. Adhesive type
mylar labels used in serialization will be suitably protected with a clear epoxy. The following information shall be
marked on each fuse:
a) AEM Part Number (see Table VI)
b) Non-recurring serial number
c) Voltage rating (VDC)
d) Current rating in amperes
e) Manufacture lot code (C-Lot)
f) AEM logo
Note: For marking examples, please refer to Figures 1, 2 and 3.
4.8 Performance.
4.8.1 Thermal Shock. When fuses are tested in accordance with 5.8.3 herein, they shall show no
electrical or mechanical damage and there shall be no loosening of the terminals. Their voltage drops shall not
change by more than 10 percent from the pre-thermally shocked values.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 4 of 26
4.8.2 Burn-in. When fus es are tes ted in acc ordance with 5.8.4, they shall not open circuit nor s hall their
voltage drops change by more than 10 percent from the pre-thermally shocked values. There shall be no
mechanical damage as a result of this testing.
4.8.3 Dielectric Strength. W hen fus es are tested in accordance with 5.8.5, the leakage c urrent shall not
exceed 1 milliampere.
4.8.4 X-Ray Inspection. When fuses are tested in accordance with 5.8.6, there shall be no rejections.
4.8.5 Current-Carrying Capacity (Group C / Qualification Only). When fuses are tested in accordance
with 5.8.7, they shall show no evidence of mechanical damage and shall carry the current as specified without
electrical failure. The temperature of the case or terminals shall at no point rise more than +85°C above the ambient
air temperature. The maximum temperature rise for 6.0, 7.5, 10, 15 and 20 ampere fuses shall be +120°C.
4.8.6 Terminal Strength. W hen fuses are tested in accordance with 5.8.8, the lead terminals shall not
break or loosen. The cold resistance values shall not change by more than 10 percent.
4.8.7 Thermal Vacuum (Qualification Only). When fuses are tested in accordance with 5.8.17, they shall
not open circuit during the application of derated DC current nor shall there be evidence of arcing or mechanical
damage af ter the test. Fuses that are subj ected to the 400 perc ent overload cur rent test s hall "blow" within the time
period specified (see Table VI). The cold resistance values of those fuses not subjected to the overload current
shall not change by more than 10 percent when measured after thermal vacuum exposure.
4.8.8 Overload Current.
4.8.8.1 Overload Current Characterization. Each fuse lot shall be sam pled to assure that blow tim e limits
fall within the limits of Table VI. Each lot shall be truncated to form an inspection lot based upon the Final Voltage
Drop after burn-in. The manufacturer shall blow samples (a minimum of 20 samples total) selected from the
extrem es of the truncated population to insure that their blow times are within the specification. The results of this
procedure shall be provided in the "Group A Data" with the lot data package.
4.8.8.2 Overload Current. Fuses selected f rom a tr uncated distribution shall be tes ted in accordanc e with
5.8.15. The clearing times and the maximum I2t shall be as specified in Table VI. After clearing, the circuit shall
rem ain open without closing again dur ing a one minute period. T he let through ener gy during the one minute per iod
shall be included in the calculation of I2t. The blown fuses shall meet the resistance after firing test of 4.8.9.
4.8.9 Resistance after Firing. When blown fuses are tested in accordance with 5.8.16, the minimum
resistanc e shall be 10 megohm s. The f ollowing exceptions shall apply for fus es with current r atings greater than 5
amperes:
a) 250% Overload - A resistance value of 100K ohms minimum following the 250% overload test.
b) Other Overloads - A resistance value of 1 megohm minimum following overload testing.
4.8.10 Moisture Resistance (Group C / Qualification Only). When fuses are tested in accordance with
5.8.9, there shall be no evidence of cracking or peeling of the fuse body, loosening of the terminals or excessive
corrosion of the leads. The resistance of the fuses shall not change by more than 15 percent as a result of the
moisture exposure.
4.8.11 Shock (Group C / Qualification Only). When fuses are tested in accordance with 5.8.10, there shall
be no evidence of mechanical damage and the fuse resistance shall not change by more than 10 percent.
4.8.12 Vibration (Group C / Qualification Only). When fuses are tested in accordance with 5.8.11, there
shall be no evidence of mechanical damage and the fuse resistance shall not change by more than 10 percent.
4.8.13 Low Temper ature Oper ation (Group C / Q ualific ation Only). When f uses are tested in ac cordanc e
with 5.8.13, they shall not open circuit and the fuse resistance shall not change by more than 10 percent.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 5 of 26
4.8.14 Life (2000 Hours, Gr oup C / Qualif ic ation O nly). When f u ses ar e tested in ac c ordanc e with 5.8.14,
they shall not open circuit and the fuse resistance shall not change by more than 10 percent.
4.8.15 Resistance to Soldering Heat (Group C / Qualification Only). When fuses are tested in accordance
with 5.8.12, there shall be no mechanical damage and the fuse resistance shall not change by more than 10
percent.
4.8.16 Solderability. Fuses shall meet the solderability requirements specified in MIL-STD-202, Method
208. Prior to testing, gold plated leads shall have the gold removed by single or double dipping into a flowing or
nonflowing hot solder of sufficient volume to assure complete gold removal.
4.8.17 Salt Spray (Group C / Qualific ation Only). When f uses are tested in ac cordanc e with 5.8.18, there
shall be no evidence of excessive corrosion. Excessive corrosion is defined as that which interferes with the
electrical or mechanical performance. There shall be no warping or cracking of the fuse body and the fuse
resistance shall not change by more than 10 percent.
4.8.18 Outgassing (Qualification Only). When fuses are tested in accordance with 5.8.19, the materials
shall meet the following requirements:
a) Total mass loss (TML) - Shall not exceed 1.0 percent.
b) Collected volatile condensable material (CVCM) - Shall not exceed 0.1 percent.
4.8.19 Short Circuit Interrupt (Group C / Qualification Only). W hen fuses are tested in accordance with
5.8.20, the resistance after short circuit testing shall be at least 1.0 megohm.
4.9 Workmanship. Fuses shall meet the visual and mechanical criteria outlined in AEM Process
Instructions P70617 and P70765 when inspected per 5.8.1.
4.9.1 Precap Inspection. Prior to molding all fuses shall be visually inspected with a minimum of 10
power magnification. Inspection criteria are outlined in the AEM Precap Document P600L-PA.
5. QUALITY A SS URANCE P ROVIS IONS
5.1 Classification of Inspection. The inspection of fuses procured to the requirements of this
specification shall be classified as follows:
a) Qualification Inspection (paragraph 5.6) when specified on the purchase order.
b) Acceptance Inspection (paragraph 5.7).
5.2 Reliability Assurance Program. AEM shall ensure that a reliability assurance program is
established and maintained in accordance with MIL-STD-790.
5.3 Test Equipment and Inspection Facilities. AEM shall establish and maintain a calibration system in
accordance with MIL-STD-45662.
5.4 Acceptance Inspection Reports. AEM shall supply with each shipment of fuses the following
minimum data:
a) All variables data acc umulated during G roup A and G roup B inspec tions . G roup C data, if requir ed
on the purchase order, shall be shipped at the completion of Group C inspection.
b) Customer specified test reports.
c) Certification of Conformance signed by Quality Assurance Manager.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 6 of 26
5.5 Inspection Conditions and Methods. Unless otherwise specified in this document, inspections shall
be conducted at room ambient environments of +25°C +/- 5°C and the maximum relative humidity shall be 75
percent.
5.6 Qualification Inspection.
5.6.1 Qualific ation Samples. Samples submitted to qualif ic ation inspec tion s hall be r epres entative of the
norm al high reliability production. A s ample of 32 f uses repres enting the lowest, m iddle, and highest voltage drops
within the truncated distribution shall be submitted for qualification inspection. At the completion of Subgroup I
inspection, the 32 samples shall be divided into the subgroups and quantities shown in Table V. Each subgroup
shall have approximately equal representation of the fuse voltage drops.
5.7 Acceptance Inspection.
5.7.1 Inspection of Fuses for Delivery. Inspection of fuses for delivery against a purchase order shall
consist of the tests listed in Table I.
5.7.2 Inspection Lot. An inspection lot shall consist of one amperage rating of one lot date code.
5.7.3 Group A Inspection. Group A inspection shall consist of the tests listed in Table II and shall be
conducted in the order indicated.
5.7.4 Group B Inspection. Group B inspection shall consist of the tests listed in Table III and shall be
conducted in the order indicated. All f us es submitted to Gr oup B ins pec tion shall have s uc c es sfully met all electric al
requirements of the Group A inspection (Visual rejects and X-Ray rejects may be utiliz ed for Group B inspection).
5.7.5 Group C Inspection. Group C inspection, when required by the purchase order, shall consist of the
tests listed in Table IV. The fuses submitted for Group C inspection shall have met Group A and Group B inspection
requirements as part of the inspection lot from which they were taken. Group C inspection must be completed within
150 day s after the completion of Group B inspection.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 7 of 26
TABLE II. GROUP A INSPECTION.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 8 of 26
TABLE III. GROUP B INSPECTION.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 9 of 26
TABLE IV. GROUP C INSPECTION.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 10 of 26
TABLE V. QUALIFICATION INSPECTION.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 11 of 26
TABLE VI. ELECTRICAL AND MECHANICAL REQUIREMENTS.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 12 of 26
5.8 Methods of Examination and Test.
5.8.1 Visual and Mechanical Inspection. Fuses shall be visually and mechanically examined per AEM
Process Instruction P70617 following the molding operation. Fuses shall be visually and mechanically examined per
AEM Process Instruction P70765 following the final assembly marking and sealing operations.
5.8.2 Resistance. The resistance of the fuse shall be measured using a constant current DC source
having an open circuit voltage not greater than the voltage rating of the fuse. The measurement current shall be
from 0.1 to 10 m illiam peres and provide a m easurem ent acc uracy of +/- 1%. A Keithley Model 580 or equivalent is
recom mended f or these meas urements. Meas urements s hall be taken at room ambient conditions as close to the
fuse element as is possible.
5.8.3 Therm al Shock . Fuses shall be test ed in accordance with Method 107, T est Condition B, of MIL-
STD-202. A total of five cycles shall be run without interruption. The voltage drops of the fuses shall be measured
before the five cycles in accordance with 5.8.4.1. The burn-in test of 5.8.4 shall follow this test.
5.8.4 Burn-in. Fuses shall be mounted by their terminals in suitable mount sockets. Spacing between
each fuse shall not be less than 0.1 inches or greater than 1 inch. Fuses shall be electrically connected to a
constant DC source supplying rated current through each f use. Current shall be applied f or 168 +4 / -0 hours while
at room ambient conditions (+25°C to +28°C). Forced air shall not flow over the fuses during this burn-in period. The
voltage drop of each fuse shall be measured in accordance with 5.8.4.1 after the burn-in period with the voltage
drop change determined from the measurement taken before the thermal shock test of 5.8.3.
5.8.4.1 Voltage Drop at Rated Current. T he voltage drop of the fus e shall be measur ed at room am bient
conditions while rated DC current is flowing through the fuse. The measurement shall be made to +/- 1 percent
accuracy w ith the voltage probes placed as close to the fuse element as is practical.
5.8.5 Dielectric Str ength. Fuses shall be tested in ac cordanc e with Method 301 of MIL- STD- 202. Fus es
shall be mounted in a test fixture capable of exposing all major surfaces of the fuse body and leads to the test
voltage. The test voltage shall be applied to the terminals electrically tied together and to the test fixture. The
following details shall apply:
a) Test voltage - 500 VRMS.
b) Duration - 5 seconds for acceptance tests.
- 60 seconds for qualification tests.
c) Leakage current - 1 milliampere maximum.
d) Measurements - DC resistanc e of the f us e af ter the dielectr ic st rength ex pos ure in
accordance with 5.8.2.
5.8.6 X-Ray Inspection. Fus es shall be subjected to r adiographic inspection in ac cordance with Method
209 of MIL-STD-202. The following details shall apply:
a) The radiograph shall be of sufficient quality to render a clear, sharp image of the penetrameter.
b) The source-object distance shall ensure a sharply defined image.
c) Two views of each fuse (0° and 90°) shall be provided.
d) A radiograph penetrameter shall be included on each radiographic film.
e) Radiographs shall be examined at 10X magnification for the defects specified in AEM P600L-R
Specification.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 13 of 26
5.8.7 Current-C arrying Capacity (Group C / Qualif ication Only). Fuse sam ples shall be appor tioned and
subm itted to the following DC test cur rents at -55°C to -60°C, at +20°C to +35°C (room am bient tem perature), and
at +125°C to +130°C:
Test Temperature DC Test Current
-55°C 110% of Rated
+25°C 100% of Rated
+ 125°C 80% of Rated
The test curr ent shall be maintained for 30 minutes af ter the temperature of each fuse has stabilized, but shall not
be applied for les s than 1.5 hours. It m ay be assum ed that the temperatur e has stabilized when three consecutive
temperature readings tak en at 10 minute intervals show no rise in tem perature. The tem perature of the fuse body
shall be measured by thermocouples (wire size 28 to 32 AWG).
5.8.8 Terminal Strength. Fuses shall be tested in accordance with Method 211 of MIL-STD-202. The
following exceptions shall apply:
a) Test Condition - Test Condition A (5 lbs pull) applying the force axially to each lead wire
individually , then Test Condition C (1 lb force) applying three bends to each wire terminal.
b) Method of Holding - The fuse body shall be held by means other than rigid clamping to prevent
stresses from being transferred to the fuse element.
c) Measurements - DC resistance measurements shall be taken before and after exposure in
accordance with 5.8.2.
5.8.9 Moisture Resistance (Group C / Qualification Only). Fuses shall be tested in accordance with
Method 106 of MIL-STD-202. The following exceptions shall apply :
a) Mounting - Normal mounting means on a noncorrosive metal panel positioned 15 degrees from the
vertical with the terminals down.
b) Polarizing voltage shall be 100 volts DC.
c) Steps 7a and 7b are not applicable.
d) Measurements - DC resistance measurements shall be taken before and after the exposure in
accordance with 5.8.2.
5.8.10 Shock (Group C / Qualification Only). Fuses shall be tested in accordance with Method 213 of
MIL-STD-202. The following details and exceptions shall apply :
a) Mounting - Fuses shall be securely fastened to the table of the shock m achine to prevent relative
motion between the fuses and the table.
b) Test Condition - F (except 1500G, 0.5 milliseconds, half-sine)
c) Loading during Test - Rated DC current on half of the samples tested.
d) Number of Shocks - Three shocks in each direction of three mutually perpendicular axes (18
shocks total).
e) Measurements - DC resistance measurements shall be taken before and after the shock exposure
in accordance with 5.8.2.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 14 of 26
5.8.11 Vibration (Gr oup C / Qualification Only). Fuses s hall be tested in accordance with Method 204 of
MIL-STD-202. The following details and exceptions shall apply :
a) Mounting - Fuses shall be securely fastened to the table of the vibration machine to prevent relative
motion between the fuses and the table.
b) Test Level - Sinusoidal vibration from 5 to 3000 hertz, 0.4 inch double amplitude or 30G's peak,
whichever is less.
c) Sweep Rate - Approximately 1/2 octave per minute.
d) Test Duration - 12 hours total (4 hours in each of three major axes).
e) Loading during Testing - Rated DC current on half of the samples tested.
f) Measurements - DC resistance measurements shall be taken before and after the vibration
exposure in accordance with 5.8.2.
5.8.12 Resistance to Solder ing Heat (Group C / Qualif ication Only). Fuses s hall be tested in accordanc e
with Method 210 of MIL-STD-202. The following exceptions shall apply:
a) The leads shall have the gold rem oved by single or double dipping into a flowing or nonf lowing hot
solder of sufficient volume to assure complete gold removal. Both leads shall be dipped in R flux
per MIL-F-14256 for a period of 5 +/- 2 sec onds, af ter which they shall be pre-tinned by imm ersion
into solder f or 3 to 5 s ec onds . T he s older shall be maintained at 260°C +/- 5°C. The leads s hall be
immersed to within .050 inches of the body of the fuse.
b) Test Condition B.
c) Cooling Time - Five minutes minimum.
d) Measurements - DC resistance measurements shall be taken before and after soldering heat
exposure in accordance with 5.8.2.
e) Examination after Test - Fuses shall be examined at a 7X magnification for evidence of mechanical
damage.
5.8.13 Low Temperature Operation (Group C / Qualification Only). Fuses shall be mounted by their
terminals in sockets and placed in a low temperature chamber. The chamber temperature shall be lowered
gradually to -55°C +0/-3°C within a period of 1 hour . After stabilizing at the low temperature for a period of 1 hour,
rated DC current shall be applied to the fuses for a period of 4 +1/-0 hours while at the low temperature. The
chamber shall then be gradually raised to room temperature within a 4 hour period and maintained at room
temper ature for a period of 8 hours m inim um. Af ter this time, the DC c urrent shall be rem oved from the fuses and
the fuses removed from the chamber. The DC resistance of the fuses shall be measured before and after the test in
accordance with 5.8.2.
5.8.14 Life (2000 Hours, Group C / Qualification Only). Fuses shall be mounted by their terminals in
sockets and placed in a chamber at +125°C +3/-0°C ambient. The fuses shall be electrically connected to a DC
source supplying 64 percent of the +25°C rated current. The current source shall supply an open circuit voltage
equal to the voltage rating of the fuses. The fuses shall remain in the chamber at the specified current for 2000 +/- 8
hours. T he electr ical cir cuit shall pr ovide a suitable indicator , which shall be m onitor ed daily during the length of the
life test, to identify failure (blowing) of any fuse. T he tim e of failur e shall be rec orded to the neares t +/-12 hours and
the blown fuse replaced with a short circuit for the remainder of the test. The DC resistance of the fuses shall be
measured before and after the test in accordance with 5.8.2.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 15 of 26
5.8.15 Overload Current. F uses s hall be subjec ted to the applic able perc ent of DC curr ent (250%, 400%
or 600%) specified in Table VI. For Group B and Group C inspections, the fuses shall be tested while at case
temperatures of +25°C to +35°C. For Qualification inspection (Subgroup II, Table V) and Group C inspection
(Subgroup II, T able IV) the fuses s hall be divided equally and tested at -55°C to -60°C, at +25°C to +35°C, and at
+125°C to +130°C. The low impedance source shall be adjusted to supply an open circuit voltage equal to the rating
of the fuse. The time to "blow" (the interval measured from the application of the current to the time the current
drops below the rating of the fuse) s hall be meas ured for eac h fuse. Each fuse shall r emain in the tes t circuit for 1
minute af ter the fuse opens to check for restrik e conditions. The m aximum clearing I2T shall be determined using
an oscillogram showing the current trace. The determination shall be made by application of Simpson's rule. A
recommended test circuit is shown in Figure 4.
5.8.16 Resistance after Firing. The open resistance of the "blown" fuse shall be measured by applying
rated DC voltage across the terminals of the fuse. The resistance value shall be taken after a one-minute
application of the test voltage.
5.8.17 Thermal Vacuum (Qualification Only). Fuses shall be mounted in suitable mount sockets. The
fuses shall then be placed in a vacuum chamber and the chamber evacuated to a pressure of 5 X 10-5 torr
max imum . T he tem peratur e of the fuse m ount shall be controlled s uch that the temperatur e of the f us es, measur ed
with a therm ocouple mounted on the fus e body, is m aintained at +125 +/- 3°C for a period of 48 +4/-0 hour s, while
90% of the +25°C rated current is flowing through each fuse. At the end of the 48 hour exposure and while the fuses
are at the test temperature and pressure, half of the sam ples shall be given an overload current at 400 percent of
their rated cur rent using the pr ocedure s pecified in 5.8.15. T he f uses shall then be rem oved fr om the cham ber and
the remaining fuses (not blown) measured for DC resistance in accordance with 5.8.2.
5.8.18 Salt Spray Corrosion (Group C / Qualification Only). Fuses shall be tested in accordance with
Method 101 of MIL-STD-202. The following details shall apply:
a) Five percent salt solution.
b) Test Condition B.
c) Following the dry i ng period, the fuses shall be subjected to 100 percent of rated current for 1 hour.
d) Following the test the fuses shall be examined for compliance with 4.8.17.
5.8.19 Outgass ing (Qualification Only). The fuses or fus e mater ials shall be tested as specified in AST M
E595.
5.8.20 Short Circuit Interrupt (Group C / Qualification Only). Fuses shall be placed in a DC test circuit
capable of supplying a minimum of 1000 amperes. The test circuit shall be made using appropriate generating
equipment as a source of power and with the rate of current r ise for the test c ircuit adjusted for at least 3.25 X 106
amper es per second. The open circuit voltage of the test circuit shall be adj usted to a value equal to the m aximum
rating of the fuse to be tested.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 16 of 26
6. APPLICATIONS
6.1 Parallel Operation. Fuses may be used in parallel operation to gain current-carrying capability.
When fuses are to be utilized in parallel configurations, the fuses should be procured as matched sets. The
requirements for matched set fuses are indicated below.
a) Each matched set shall consist of two or more fuses.
b) Matched set fuses shall be from the same manufacturing lot (same voltage and current rating).
c) Matched set fuses shall be created by matching individual voltage drops within the set to
within 1% (highest to lowest within individual set). T he voltage drop values used for m atc hing shall
be extracted from the voltage drops taken following the burn-in period.
d) Matched set fuses shall be marked in accordance with paragraph 4.7, except that an additional
matched set serial label shall be placed on the top of each part. Matched set serial labels shall
consist of a unique number for each fuse set, followed by a unique letter for each fuse within the
set (i.e., 001A, 001B, 001C, 001D; 002A, 002B, 002C, 002D; etc.) . Matched fuses may exceed the
maximum height dimension by .010 inches as a result of the match set label.
e) Matched set fuses shall be packaged together, separate from other matched set fuses.
f) Data generated by the matching requirement shall be included with the standard Group A and
B Data Package.
g) The number of fuses within the matched set shall be specified on the purchase order.
6.2 Installation. Fuses may be mounted directly onto a printed circuit board or in crimp type
receptacles. Bending or twisting of the leads should not be done without mechanically supporting the leads at the
exit of the fuse body. For surface mount applications, P600L fuses may be procured as SK406 options. AEM
drawing 887108 (Revision C) provides the outline package dimensions for each P600L Figure supplied as an
SK406 part type. Group A and B Screening for SK406 part types shall be as s pec if ied in this document (ex c ept that
Solderability is conducted as the first test for Group B). To order a P600L part type in a SK406 lead option,
substitute “SK406” for “P600L” in the standard part number.
Example: P600L-72-5.0 (Radial Leaded Format)
SK406-72-5.0 (Surface Mount Format)
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 17 of 26
FIGURE 1. DIMENSIONS, CONSTRUCTION AND MARKING.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 18 of 26
FIGURE 2. DIMENSIONS, CONSTRUCTION AND MARKING.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 19 of 26
FIGURE 3. DIMENSIONS, CONSTRUCTION AND MARKING.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 20 of 26
FIGURE 4. OVERLOAD CURRENT TEST CIRCUIT.
FIGURE 5. CURRENT DERATING LIMITS.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 21 of 26
FIGURE 6. OPERATIONS FLOW CHART.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 22 of 26
DOCUMENT CHANGE NOTICE
REV. LETTER REV. DATE PAGE CHANGE ITEM APPROVAL
A 11-25-87 N/A Issued new drawing. F.D. 11-25-87
B 05-01-90 All Rety ped and renumbered. J.M. 05-01-90
4 Para. 1.0: Changed Temp. Rating
to -55ΕC to 150ΕC.
5 Para. 3.3: Added P600L-M Spec.
5 Para. 4.5: Changed Temp. Rating
to -55ΕC to 150ΕC.
5 Para. 4.6: Changed test current
to 0.1 to 10 milliamperes.
6 Para. 4.9.5: Changed TCR from
0.25% to 0.35% per ΕC.
7 Para. 4.9.10: Deleted Note B.
8 Para. 5.2: Changed NBS to NIST.
14 Para. 5.6.2: Changed test current
to 0.1 to 10 milliamperes.
14 Para. 5.6.4: Deleted 80% current
exception for 10 and 15 amp fuses.
15 Para. 5.6.7: Added High Temp.
Reference of +125ΕC.
17 Para. 5.6.14: Deleted Heat Sink
Requirement.
19 Table VI: Added new part numbers
for 125 VDC fuses.
20 Figure 2: Redrawn.
21 Figure 3: Redrawn.
22 Figure 4: Flow Chart redrawn
to reflect changes in mfg.
24 Figure 6: Derating Curve redrawn.
25 Para. 6.1: Added reference to
P600L-M Spec.
C 05-01-92 All Completely retyped and numbered. J.M. 5-01-92
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 23 of 26
DOCUMENT CHANGE NOTICE
REV. LETTER REV. DATE PAGE CHANGE ITEM APPROVAL
2 Added ref. to MIL-F-23419 and
MIL-F-12456.
3 Added ref. to MIL-STD-690 and
MIL-STD-790.
3 Added ref. to MIL-STD-45662 and
ASTM E595.
3 Para. 4.3: Added 50 VDC ref.
4 Para. 4.7: Added ref. to Fig. 3.
5 Para. 4.9.6: Added requirement for
Current Carrying Capacity .
6 Para. 4.9.17: Added requirement for
Solderability.
6 Para. 4.9.18: Added requirement for
Salt Spray.
6 Para. 4.9.19: Added requirement for
Outgassing.
6 Para. 4.9.20: Added requirement for
Short Circuit Interrupt.
7 Para. 5.2: Added ref. to MIL-STD-790.
8 Para. 5.7: Added requirement for FR
(Failure Rate) Qualification.
9 Table II: Added ref. to MIL-F-23419.
10 Table III: Added requirement for
Terminal Strength & Solderability .
11 Table IV: Reduced number of defective
allowed for Subgroup I to 0.
12 Table V: Completely revised qual-
ification plan per MIL-F-23419.
13 Table VI: Revised cold resistance
and clear-time limits for fuses. Added
I2T requirements.
14 Added Table VII for FR Qualification.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 24 of 26
DOCUMENT CHANGE NOTICE
REV. LETTER REV. DATE PAGE CHANGE ITEM APPROVAL
15 Para. 5.9.4: Changed minimum
spacing from 1/2 to 1/4 inch.
16 Para. 5.9.8: Added method for Current
Carrying Capacity .
17 Para. 5.9.10: Change requirement for
pull from 2 to 5 pounds.
17 Para. 5.9.12: Added requirement for
mounting method.
17 Para. 5.9.13: Added requirement for
mounting method.
18 Para. 5.9.14: Added requirement for
removal of gold prior to testing.
18 Para. 5.9.16: Changed life test
temperature from +85ΕC to +125ΕC.
19 Para. 5.9.17: Added requirement for
testing at -55ΕC and +125ΕC, and
I2T method for measurement.
19 Para. 5.9.19: Changed test temperature
from + 8 5 ΕC to +125 ΕC.
19 Para. 5.9.20: Added method for Salt Spray
Testing.
19 Para. 5.9.21: Added method for
Outgassing Test.
19 Para. 5.9.22: Added method for Short
Circuit Testing.
21 Figure 1: Changed dimension from
0.275 to 0.280.
22 Figure 2: Changed dimension from
0.375 to 0.380.
23 Figure 3: New drawing.
25 Figure 6: Revised Flow Chart to
reflect methods of manufacture.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 25 of 26
DOCUMENT CHANGE NOTICE
REV. LETTER REV. DATE PAGE CHANGE ITEM APPROVAL
D 07-11-94 4 Para. 4.9.1: Deleted reference to J.M. 7-11-94
temperature cycling.
8 Para. 5.8.4: Added note allowing visual
and x-ray rejects to be used for Group B
tests.
13 Table VI: Revised cold resistance limits
for 125 VDC fuses rated at 1.5, 2.0, 3.0,
4.0 and 5.0 amps.
18 Para. 5.9.14: Changed flux from RMA
to R ty pe.
E 6-5-95 All Added reference to AEM. J.M. 6-5-95
11 Table IV: Added Mil-F-23419
Test Flow (FM12).
13 Table VI: Changed cold res.
limits for P600L-72-15.0 and P600L-
50-20.0 fuse ty pes.
F 12-18-95 All Removed all references to Mil-Std-690. J.M. 12-18-95
All Added "Group C / Qualification Only "
for all Group C / Qual. test paragraphs.
4 Para's 4.6 and 4.8.4: Revised.
Removed TCR requirement.
5 Para. 4.8.8.1: Changed to 20 samples min.
7 Para’s 5.3, 5.4 and 5.7.5: Revised.
8 Table II: Repositioned DWV test.
Added PDA note 1.
10 Table IV: Revised to follow Mil-F-23419/12.
11 Table V: Revised to follow Mil-F-23419/12.
13 Para. 5.8.1: Revised to list AEM Procedures.
13 Para. 5.8.4: Revised for part spacing.
22 Figure 6: Revised to follow Mil-F-23419/12.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P600L SPECIFICATION
NUMBER P600L REVISION K ECN 2116 SHEET 26 of 26
DOCUMENT CHANGE NOTICE
REV. LETTER REV. DATE PAGE CHANGE ITEM APPROVAL
G 6-21-96 All Edited document for improved readability . J.M. 6-21-96
2 Para. 1.1: Revised operating temperature range to
-55ΕC to +125ΕC (was -55ΕC to +150ΕC).
11 Table V: Revised Subgroup III per FM12 Spec.
H 1-29-97 22 Updated Figure 6 (ECN 2048) J.M. 1-31-97
J 11-1-99 3 Removed reference to P600L-M Specification. J.M. 11/99
3 Para. 4.3: Added reference to 135 VDC ratings.
11 Table VI: Added note /4 for 135 VDC options.
16 Para. 6.1: Added requirements (a – g) for match
set fuse s.
16 Para. 6.2: Added option for SK406 fuses for S.M.
applications.
K 11 Table 6: Corrected Note 4C to reference 487034,
487035 and 487036 (Rev. B for each).
16 Para. 6.2: Added reference to drawing revision C
for 887108.
