T4-LDS-0037-1, Rev 1 (111456) ©2011 Microsemi Corporation Page 1 of 5
1N5518B thru 1N5546B-1
Availa ble on
commercial
versions
Low Voltage Avalanche
500 mW Zener Diodes DO-35
Qualified per MIL-PRF-19500/437
Qualified Levels:
JAN, JANTX and
JANTXV
DESCRIPTION
The 1N5518 thru 1N5546 series of 0.5 watt axial-leaded glass Zener Voltage Regulators
provides a selection from 3.3 to 33 volts with tolerances ranging from plus/minus 1% to 20%.
The standard tolerance is plus/minus 5% with the B suffix unless ordered otherwise. These
axial-leaded glass DO-35 Zeners are also available with an internal metallurgical bond option.
This type of bonded Zener package construction is also available in JAN, JANTX, and
JANTXV military qualifications. Microsemi also offers numerous other Zener products to meet
higher and lower power applications.
DO-35 (DO-204AH)
Package
Also available in:
DO-213AA MELF
(surface mount)
1N5518BUR-1 thru
1N5546BUR-1
Important: For the latest information, visit our website http://www.microsemi.com.
FEATURES
• JEDEC registered 1N5518 thru 1N5546.
• Voltage tolerances of plus/minus 20%, 10%, 5%, 2%, and 1% available. See Note 1 on page 3.
• Interna l meta llurg ic al bond option available with “-1” suffix.
• JAN, JANTX, and JANTXV qualification per MIL-PRF-19500/437 available (requires metallurgical
bond option as well as plus/minus 5% voltage tolerance or tighter with B-1, C-1 or D-1 suffix).
• RoHS compliant versions available (commercial grade only).
APPLICATIONS / BENEFITS
• Regulates voltage over a broad operating current and temperature range.
• Guaranteed voltage regulation (∆VZ) from IZL to IZT.
• Voltage selection from 3.3 to 33 V.
• Flexible axial-lea d mount ing te r minals.
• Nonsensitive to ESD per MIL-STD-750 Method 1020.
• Minimal capacitance (see Figure 3).
• Inherently radiation hard as described in Microsemi “MicroNote 050” which is available at
Microsemi.com.
MAXIMUM RATINGS
MSC – Lawrence
6 Lake Street,
Lawrence, MA 01841
1-800-446-1158
(978) 620-2600
Fax: (978) 689-0803
MSC – Ireland
Gort Road Business Park,
Ennis, Co. Clare, Ireland
Tel: +353 (0) 65 6840044
Fax: +353 (0) 65 6822298
Website:
www.microsemi.com
Parameters/Test Conditions
Symbol
Value
Unit
Junction and Storage Temperature
TJ and TSTG
-65 to +175
oC
Steady-State Power
(Note 1)
(Also see derating in Figure 2)
PD 0.5 W
Thermal Resi stan ce Jun cti on-to-Lead (Note 2)
RӨJL
250
oC/W
Thermal Resi stan ce Jun cti on-to-Ambient (Note 3)
RӨJA
300
oC/W
Forward Voltage @ 200 mA
VF
1.1
V
Solder Pad Temperature @ 10 s
TSP
260
oC
Notes: 1. At TL < 50 oC 3/8 inch (10 mm ) from body or 0.48 W at TA < 25 ºC when mount ed on FR4 PC board as
described for thermal resistance above.
2. At 3/8 (10 mm) lead length from body.
3. When mounted on FR4 PC board (1 oz Cu) with 4 mm2 copper pads and track width 1 mm, length 25 mm.
T4-LDS-0037-1, Rev 1 (111456) ©2011 Microsemi Corporation Page 2 of 5
1N5518B thru 1N5546B-1
MECHANICAL and PACKAGING
• CASE: Hermetically sealed axial-lead glass DO-35 (DO-204AH) package.
• TERMINALS: Leads, tin-lead plated solderable per MIL-STD-750, method 2026. RoHS compliant matte-Tin available for
commercial only.
• POLARITY: Cathode indicated by band where diode is to be operated with the banded end positive with respect to the opposite
end for Zener regulation.
• MARKING: Part number.
• TAPE & REEL option: Standard per EIA-296 (add “TR” suffix to part number). Consult factory for quantities.
• WEIGHT: 0.2 grams.
• See Package Dimensions on last page.
PART NOMENCLATURE
JAN 1N5518 B -1 (e3)
Reliability Level
JAN = JAN Level
JANTX = JANTX Level
JANTXV = JANTXV Level
Blank = Commercial
JEDEC type number
(see Electrical Characteristic
table)
Zener Voltage Tolerance
A = 10%
B = 5%
C = 2%
D = 1%
Blank = 20%
RoHS Compli ance
e3 = RoHS compliant (available
on commercial grade only)
Blank = non-RoHS compliant
Metallurgical Bond
-1 = Metallurgical bond
blank = Standard bond
SYMBOLS & DEFINITIONS
Symbol
Definition
IR
Reverse Current: The maximum reverse (leakage) current that will flow at the specified voltage and temperature.
IZ, IZT, IZK
Regulator Current: The dc regulator current (IZ), at a specified test point (IZT), near breakdown knee (IZK).
IZL
Low Regulator (Zener) Current: The lowest rated dc current for the specified power rating.
IZM
Maximum Regulator (Zener) Current: The maximum rated dc current for the specified power rating.
VZ
Zener Voltage: The zener voltage the device will exhibit at a specified current (I Z) in its breakdown region.
∆VZ
Voltage Regulation: The change in zener voltage between two specified currents or percentage of IZM.
ZZT or ZZK
Dynamic Impedance: The small signal impedance of the diode when biased to operate in its breakdown region at a
specified rms current modulation (typically 10% of IZT or IZK) and superimpos ed on IZT or IZK respectively.
T4-LDS-0037-1, Rev 1 (111456) ©2011 Microsemi Corporation Page 3 of 5
1N5518B thru 1N5546B-1
ELECTRICAL CHARACTERISTICS
(TA = 25
o
C unless otherwise noted. Based on DC measurements at thermal equil i bri um; VF = 1.1 Max @ IF = 200 mA for all types.)
JEDEC
TYPE
NUMBER
(Note 1)
NOMINAL
ZENER
VOLTAGE
VZ @ IZT
(Note 2)
Volts
TEST
CURRENT
IZT
mA
MAX. ZENER
IMPEDANCE
B-C-D SUFFIX
ZZT @ IZT
(Note 3)
Ohms
MAX. R EVERSE LEAKAGE
CURRENT (Note 4)
B-C-D
SUFFIX
MAXIMUM
DC ZENER
CURRENT
IZM
(Note 5)
mAdc
B-C-D SUFFIX
MAX. NOISE
DENSITY
AT IZ = 250µA
ND
µ
V/
√
Hz
REGULATION
FACTOR
∆
VZ
(Note 6)
Volts
LOW V
Z
CURRENT
IZL
(Note 6)
mA
IR
µA
VR – Volts
NON & A-
SUFFIX
B-C-D
SUFFIX
1N5518
1N5519
1N5520
1N5521
1N5522
3.3
3.6
3.9
4.3
4.7
20
20
20
20
10
26
24
22
18
22
5.0
3.0
1.0
3.0
2.0
0.90
0.90
0.90
1.0
1.5
1.0
1.0
1.0
1.5
2.0
115
105
98
88
81
0.5
0.5
0.5
0.5
0.5
0.90
0.90
0.85
0.75
0.60
2.0
2.0
2.0
2.0
1.0
1N5523
1N5524
1N5525
1N5526
1N5527
5.1
5.6
6.2
6.8
7.5
5.0
3.0
1.0
1.0
1.0
26
30
30
30
35
2.0
2.0
1.0
1.0
0.5
2.0
3.0
4.5
5.5
6.0
2.5
3.5
5.0
6.2
6.8
75
68
61
56
51
0.5
1.0
1.0
1.0
2.0
0.65
0.30
0.20
0.10
0.05
0.25
0.25
0.01
0.01
0.01
1N5528
1N5529
1N5530
1N5531
1N5532
8.2
9.1
10.0
11.0
12.0
1.0
1.0
1.0
1.0
1.0
40
45
60
80
90
0.5
0.1
0.05
0.05
0.05
6.5
7.0
8.0
9.0
9.5
7.5
8.2
9.1
9.9
10.8
46
42
38
35
32
4.0
4.0
4.0
5.0
10
0.05
0.05
0.10
0.20
0.20
0.01
0.01
0.01
0.01
0.01
1N5533
1N5534
1N5535
1N5536
1N5537
13.0
14.0
15.0
16.0
17.0
1.0
1.0
1.0
1.0
1.0
90
100
100
100
100
0.01
0.01
0.01
0.01
0.01
10.5
11.5
12.5
13.0
14.0
11.7
12.6
13.5
14.4
15.3
29
27
25
24
22
15
20
20
20
20
0.20
0.20
0.20
0.20
0.20
0.01
0.01
0.01
0.01
0.01
1N5538
1N5539
1N5540
1N5541
1N5542
18.0
19.0
20.0
22.0
24.0
1.0
1.0
1.0
1.0
1.0
100
100
100
100
100
0.01
0.01
0.01
0.01
0.01
15.0
16.0
17.0
18.0
20.0
16.2
17.1
18.0
19.8
21.6
21
20
19
17
16
20
20
20
25
30
0.20
0.20
0.20
0.25
0.30
0.01
0.01
0.01
0.01
0.01
1N5543
1N5544
1N5545
1N5546
25.0
28.0
30.0
33.0
1.0
1.0
1.0
1.0
100
100
100
100
0.01
0.01
0.01
0.01
21.0
23.0
24.0
28.0
22.4
25.2
27.0
29.7
15
14
13
12
35
40
45
50
0.35
0.40
0.45
0.50
0.01
0.01
0.01
0.01
NOTES:
1. TOLERANCE AND VOLTAGE DESIGNATION –
The JEDEC type numbers shown are +/-20% with guarant eed limits for only VZ, IR, and VF. Units with A suffix are +/-10% with
guaranteed limits f or VZ, IR, and VF. Units with guaranteed limi ts for all six paramet ers are indicated by a B suffix for +/-5.0% units,
C suffix for +/-2.0% and D suffix for +/-1.0%.
2. ZENER VOLTAGE (V Z) MEASUREMENT –
Nominal zener voltage is measured with the devic e juncti on in thermal equilibri um with ambient t emperature of 25 oC.
3. ZENER IMPEDANCE (ZZ) MEASUREMENT –
The zener impedance is derived from the 60 Hz ac voltage, which results when an ac current having an rms value equal to 10%
of the dc zener current (IZT) is superimposed on IZT.
4. REVERSE LEAKAGE CURRENT (IR) –
Reverse leakage currents are guaranteed and are measured at VR as shown on the table.
5. MAXIMUM REGULATOR CURRENT (IZM) –
The maximum current shown is as shown in MIL-PRF-19500/437.
6. MAXIMUM REGULATION FACT OR (∆VZ) –
∆VZ is the maximum difference between VZ at IZT and VZ at IZL measured with the device junction in thermal equilibr ium.
T4-LDS-0037-1, Rev 1 (111456) ©2011 Microsemi Corporation Page 4 of 5
1N5518B thru 1N5546B-1
GRAPHS
FIGURE 1 TL – Lead Temperature (oC) 3/8” from body
Noise Density Measurement Circuit
FIGURE 2 – Temperature-Power Derating Curve
ZENER VOLTAGE VZ
FIGURE 3 FIGURE 4
Capacitanc e vs. Ze ner Vol t age Zener Diode Characteristics and Symbol Identification
(TYPICAL)
Rated Maximum DC Operation (mW)
Noise density, (N
D
) is specified in microvolts rms per
square-root-hertz (µV/ √Hz). Actual measurement is
performed usi ng a 1 kHz to 3 kHz frequency bandpass
filt er with a constant Zener test current (IZT) at 25 oC
ambient temperature.
TYPICAL CAPACITANCE IN PICOFARADS
At zero volts
At –2 volts (VR)
T4-LDS-0037-1, Rev 1 (111456) ©2011 Microsemi Corporation Page 5 of 5
1N5518B thru 1N5546B-1
PACKAGE DIMENSIONS
Ltr
Dimensions
Notes
Inch
Millimeters
Min
Max
Min
Max
BD
.055
.090
1.40
2.29
3
BL
.120
.200
3.05
5.08
3
LD
.018
.022
0.46
0.56
LL
1.000
1.500
25.40
38.10
LL1
.050
1.27
4
NOTES:
1. Dimensions are in inch.
2. Millimeters are given for general information only.
3. Package contour optional within BD and length BL. Heat slugs, if any, shall be included within this cylinder
but shall not be subject to minimum limit of BD. The BL dimension shall include the entire body including
slugs.
4. Within this zone lead, diameter may vary to allow for lead finishes and irregularities other than heat slugs.
5. In accordance with ASME Y14.5M, diameters are equivalent to Φx symbology.
