www.vishay.com For technical questions, contact: ff2aresistors@vishay.com Document Number: 31019
86 Revision: 05-May-08
PTF
Vishay Dale
Metal Film Resistors, Precision, Ultra-High Stability
FEATURES
•Extremely low temperature coefficient of
resistance
•Very low noise and voltage coefficient
•Very good high frequency characteristics
•Can replace wirewound bobbins
•Proprietary epoxy coating provides
superior moisture protection
•Lead (Pb)-free version is RoHS compliant
Note:
• Marking: Print-marked-model, Value, Tolerance, TC, Date code
Note:
(1) Historical tolerance codes were BB for 0.01 % and BC for 0.02 %
* Pb containing terminations are not RoHS compliant, exemptions may apply
Available
Pb-free
RoHS*
COMPLIANT
e3
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL
HISTORICAL
MODEL
POWER RATING
P85 °C
W
LIMITING ELEMENT
VOLTAGE MAX.
V≅
TEMPERATURE
COEFFICIENT
ppm/°C
TOLERANCE
%
RESISTANCE
RANGE
Ω
PTF51 PTF-51 0.05 200 5, 10, 15 0.02, 0.05, 0.1, 0.25, 0.5, 1 15R to 100K
PTF56 PTF-56 0.125 300 5, 10, 15 0.01, 0.02, 0.05, 0.1, 0.25, 0.5, 1 15R to 500K
PTF65 PTF-65 0.25 500 5, 10, 15 0.05, 0.1, 0.25, 0.5, 1 15R to 1M0
TEMPERATURE COEFFICIENT CODES
GLOBAL TC CODE HISTORICAL TC CODE TEMPERATURE COEFFICIENT
ZT- 1 6 5 ppm/°C
YT- 1 3 10 ppm/°C
X T-10 15 ppm/°C
TECHNICAL SPECIFICATIONS
PARAMETER UNIT PTF51 PTF56 PTF65
Rated Dissipation at 85 °C W 0.05 0.125 0.25
Limiting Element Voltage V≅200 300 500
Insulation Voltage (1 Min) Veff > 500 > 500 > 500
Thermal Resistance K/W < 1300 < 520 260
Terminal Strength, Axial N > 150 > 50 > 50
Insulation Resistance Ω≥ 1011 ≥ 1011 ≥ 1011
Category Temperature Range °C - 55 to + 150 - 55 to + 150 - 55 to + 150
Failure Rate 10-9/h< 1< 1< 1
Weight (Max.) g 0.11 0.35 0.75
GLOBAL PART NUMBER INFORMATION
RESISTANCE TOLERANCE
MODEL VALUE CODE
PTF51 R = Decimal
K = Thousand
M = Million
15R000 = 15 Ω
500K00= 500 kΩ
1M0000= 1.0 MΩ
T = ± 0.01 % (1) Z = 5 ppm EK = Lead (Pb)-free, Bulk
EA = Lead (Pb)-free, T/R (Full)
EB = Lead (Pb)-free,
T/R (1000 pieces)
BF = Tin/Lead, Bulk
RE = Tin/Lead, T/R (Full)
R6 = Tin/Lead, T/R (1000 pieces)
Q = ± 0.02 % (1) Y= 10 ppm
PTF65 A = ± 0.05 %X = 15 ppm
B=± 0.1 %0 = Special
C=± 0.25 %
D=± 0.5 %
F=± 1 %
New Global Part Numbering: PTF5620K500BYRE (preferred part numbering format)
PT F 56 2 0K5 0 0B Y
Historical Part Number example: PTF-5620K5BT-13R36 (will continue to be accepted)
PTF-56 20K5 B T-13 R36
HISTORICAL RESISTANCE TOLERANCE TEMP.
MODEL VALUE CODE COEFFICIENT
Blank = Standard
(Dash Number)
(up to 3 digits)
From
1 - 999
PACKAGING
as applicable
PTF56
RE
TEMP.
COEFFICIENTSPECIAL
GLOBAL
PACKAGING
Document Number: 31019 For technical questions, contact: ff2aresistors@vishay.com www.vishay.com
Revision: 05-May-08 87
PTF
Metal Film Resistors, Precision, Ultra-High Stability Vishay Dale
DIMENSIONS
Note:
(1) 1.08 ± 0.125 [27.43 ± 3.18] if tape and reel
L1 max.
LD
1.50 ± 0.125 (1)
[38.10 ± 3.18]
d
GLOBAL
MODEL
DIMENSIONS in inches [millimeters]
LDL
1 max. d
PTF51 0.150 ± 0.020
[3.81 ± 0.51]
0.070 ± 0.010
[1.78 ± 0.25]
0.200
[5.08]
0.016
[0.41]
PTF56 0.250 ± 0.031
[6.35 ± 0.79]
0.091 ± 0.009
[2.31 ± 0.23]
0.300
[7.62]
0.025
[0.64]
PTF65 0.375 ± 0.062
[9.53 ± 1.57]
0.145 ± 0.016
[3.68 ± 0.41]
0.475
[12.07]
0.025
[0.64]
PERFORMANCE
TEST CONDITIONS OF TEST TEST RESULTS
Life MIL-PRF-55182 Paragraph 4.8.18
1000 h rated power at + 85 °C ≤ ± 0.04 %
Thermal Shock MIL-STD-202, Method 107
- 55 °C to + 85 °C ≤ ± 0.02 %
Short Time Overload MIL-R-10509, Paragraph 4.7.6 ≤ ± 0.01 %
Low Temperature Operation MIL-PRF-55182, Methods 4.8.10 ≤ ± 0.02 %
Moisture MIL-PRF-55182, Paragraph 4.8.15 ≤ ± 0.08 %
Resistance to Soldering Heat MIL-STD-202, Methods 210 ≤ ± 0.02 %
Damp Heat IEC 60068-2-3 56 days at 40 °C and 92 % RH ≤ ± 0.08 %
Dielectric Withstanding Voltage MIL-STD-202, Methods 301 and 105 ≤ ± 0.01 %
MATERIAL SPECIFICATIONS
Element: Precision deposited nickel chrome
alloy with controlled annealing
Encapsulation: Specially formulated epoxy
compounds. Coated construction
Core: Fire-cleanded high purity ceramic
Termination:
Standard lead material is
solder-coated copper. Solderable and
weldable per MIL-STD-1276, Type C.
AMBIENT TEMPERATURE IN °C
DERATING
RATED POWER IN %
0
20
40
60
80
100
120
- 55
- 25 0 25 50 75 100 125 150 175 200
85
TEMPERATURE COEFFICIENT OF RESISTANCE
Temperature coefficient (TC) of resistance is normally stated as
the maximum amount of resistance change from the original
+ 25 °C value as the ambient temperature increases of
decreases. This is most commonly expressed in parts per
million per degree centigrade (ppm/°C).
The resistance curve over the operating temperature range is
usually a non-linear curve within predictable maximum limits.
PTF resistors have a very unifom resistance temp.
characteristic when measured over the operating range of
- 20 °C to + 85 °C. The standard temperature coefficients
available are
X = ± 15 ppm/°C, Y = ± 10 ppm/°C and Z = ± 5 ppm/°C.
Some applications of the PTF require operation beyond the
specifications of - 20 °C to + 85 °C. The change in temperature
coeffecient of resistance is very small (less than ± 0.05 ppm/°C)
over the expanded temperature range of - 55 °C to ± 150 °C.
Therefore, when operating outside the range - 20 °C to + 85 °C,
the designer can plan for a worst case addition of
± 0.05 ppm/°C for each degree centigrade beyond either
- 20 °C or + 85 °C as indicated in the graph. This applies to all
three temperature coefficient codes.
Example: Assume the operating characteristics demand a
temperature range from - 55 °C to + 125 °C. This requires a
± 35 °C Δ below - 20 °C and a ± 40 °C Δ above + 85 °C. The
extreme Δ being ± 40 °C means that the worst case addition to
the specified TC limit of ± 0.05 ppm/°C times ± 40 °C or
± 2 ppm/°C. Therefore, a Z which is characterized by a base TC
limit of ± 5 ppm/°C over the temperature range of - 20 °C to
± 85 °C will exhibit a maximum temperature coefficient of
± 7 ppm/°C over the expanded portion of the temperature range
of - 55 °C to + 125 °C.
4
3
2
1
0
- 50 - 40 - 30 - 20 90 100 110 120 130 140 150
EXPANDED
OPERATING RANGE
- 55 °C TO - 20 °C
EXPANDED
OPERATING RANGE
- 85°
C TO + 150 °C
- 20 °C TO + 85°
C
BASE TC LIMIT
X, Y
or Z
/
mp
p?C
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Document Number: 91000 www.vishay.com
Revision: 18-Jul-08 1
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