www.vishay.com For technical questions, contact: ff2aresistors@vishay.com Document Number: 31019
86 Revision: 18-Nov-10
PTF
Vishay Dale
Metal Film Resistors, High Precision, 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
•
For surface mount product, see Vishay Dale’s PSF
datasheet
•
Compliant to RoHS Directive 2002/95/EC
Notes
• Marking: Print-marked-model, value, tolerance, TC, date code
• DSCC has created a drawing to support the need for a precision axial-leaded product. Vishay Dale is listed as a resource on this drawing as
follows:
This drawing can be viewed at: www.dscc.dla.mil/Programs/MilSpec/ListDwgs.asp?DocType=DSCCdwg
(1) Continuous working voltage shall be or maximum working voltage, whichever is less.
(2) Hot solder dipped leads
(3) For operation of the PTF resistors at higher power ratings, see the Load Life Shift Due to Power and Derating table. This table gives a
summary of the effects of using the PTF product at the more common combinations of power rating and case size, as well as quantifies the
load life stability under those conditions.
Note
(4) Historical tolerance codes were BB for 0.01 % and BC for 0.02 %
* Pb containing terminations are not RoHS compliant, exemptions may apply
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL
HISTORICAL
MODEL
POWER RATING (3)
P85 °C
W
LIMITING ELEMENT
VOLTAGE MAX. (1)
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 15 to 100K
PTF56 PTF-56 0.125 300 5, 10, 15 0.01, 0.02, 0.05, 0.1, 0.25, 0.5, 1 15 to 500K
PTF65 PTF-65 0.25 500 5, 10, 15 0.05, 0.1, 0.25, 0.5, 1 15 to 1M
DSCC
DRAWING
NUMBER
VISHAY DALE
MODEL
POWER RATING
P85 °C
W
RESISTANCE
RANGE
Ω
TOLERANCE
± %
TEMPERATURE
COEFFICIENT
± ppm/°C
MAXIMUM WORKING
VOLTAGE (1)
V
89088 PTF56..31,
PTF56..32 (2) 0.100 15 to 100K 0.01, 0.05, 0.1, 0.5, 1 5, 10 200
90038 PTF65..16,
PTF65..14 (2) 0.250 15 to 100K 0.05, 0.1, 0.5, 1 5, 10 200
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
P x R
GLOBAL PART NUMBER INFORMATION
HISTORICAL RESISTANCE TOLERANCE TEMP.
MODEL VALUE CODE COEFFICIENT
PTF-56 20K5 B T-13 R36
RESISTANCE TOLERANCE
MODEL VALUE CODE
PTF51 R = Ω
K = kΩ
M = MΩ
15R000 = 15 Ω
500K00= 500 kΩ
1M0000= 1.0 MΩ
T = ± 0.01 %
(4)
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 %
(4)
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)
Blank = Standard
(Dash number)
(Up to 3 digits)
From
1 to 999
PACKAGING
as applicable
PTF56
RE
TEMP.
COEFFICIENTSPECIAL
GLOBAL
PACKAGING
Document Number: 31019 For technical questions, contact: ff2aresistors@vishay.com www.vishay.com
Revision: 18-Nov-10 87
PTF
Metal Film Resistors, High Precision, High Stability Vishay Dale
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
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 (TYPICAL TEST LOTS)
Life (at Standard Power Ratings) 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.
www.vishay.com For technical questions, contact: ff2aresistors@vishay.com Document Number: 31019
88 Revision: 18-Nov-10
PTF
Vishay Dale Metal Film Resistors, High Precision, High Stability
LOAD LIFE SHIFT DUE TO POWER AND DERATING (AT 85 °C)
The power rating for the PTF parts is tied to the derating temperature, the heat rise of the parts, and the ΔR for the load life performance.
When the tables/graphs below are used together they show that when the parts are run at higher power ratings, the parts will run hotter,
which has the potential of causing the resistance of the parts to shift more over the life of the part.
LOAD LIFE SHIFT VS. POWER RATING
LOAD LIFE
CONDITIONS OF TEST MAXIMUM ΔR (TYPICAL TEST LOTS)
MIL-PRF-55182 Paragraph 4.8.18
1000 h rated power at + 85 °C ≤ ± 0.04 % ≤ ± 0.15 % ≤ ± 0.5 % ≤ ± 1.0 %
MODEL POWER RATING AT + 85 °C
PTF51 1/20 W 1/10 W 1/8 W 1/4 W
PTF56 1/8 W - 1/4 W 1/2 W
PTF65 1/4 W - 1/2 W 3/4 W
Example: When a PTF56 part is run at 1/8 W in a 70 °C ambient environment, the resistor will generate enough heat that the surface
temperature of the part will reach about 17 °C over the ambient temperature, and over the life of the part this could cause the resistance
value to shift up to ± 0.04 %.
If the same resistor was instead run at 1/4 W in a 70 °C environment, the element will heat up to about 30 °C over ambient, and over the life
of the part the resistance value could shift roughly ± 0.5 %.
And if the resistor was run at its maximum power rating of 1/2 W in a 70 °C environment, it will heat up to about 61°C over ambient, and you
could see the resistance value shift roughly ± 1 % over the life of the part.
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
0
20
40
60
80
100
120
APPLIED POWER IN W
HEAT RISE (°C ABOVE AMBIENT)
0 0.125 0.25 0.375 0.5 0.625 0.75 0.875 1 1.125
THERMAL RESISTANCE
PTF65
PTF56
PTF51
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 or 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 temperature 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 coefficient 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
ppm/°C
E
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NI C
T
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S
AB O
T
NOIT
I
DDA
EHT
FO NO
I
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OP DED
N
A
PXE
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G
NAR ERUTA
REPMET
Document Number: 91000 www.vishay.com
Revision: 11-Mar-11 1
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