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
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL HISTORICAL
MODEL
MODEL
RESISTANCE
POWER RATING
(3)
LIMITING ELEMENT TEMPERATURE
TOLERANCE
RANGE
P
85 °C
VOLTAGE MAX.
(1)
COEFFICIENT
±%
Ω
W
V
± ppm/°C
0.05
200
5, 10, 15
0.02, 0.05, 0.1, 0.25, 0.5, 1
15 to 100K
0.125
300
5, 10, 15
0.01, 0.02, 0.05, 0.1, 0.25, 0.5, 1
15 to 500K
0.25
500
5, 10, 15
0.05, 0.1, 0.25, 0.5, 1
15 to 1M
PTF51
PTF-51
PTF56
PTF-56
PTF65
PTF-65
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:
DSCC
DRAWING
NUMBER
89088
90038
VISHAY DALE
MODEL
PTF56..31,
PTF56..32
(2)
PTF65..16,
PTF65..14
(2)
POWER RATING
P
85 °C
W
0.100
0.250
RESISTANCE
RANGE
Ω
15 to 100K
15 to 100K
TOLERANCE
±%
0.01, 0.05, 0.1, 0.5, 1
0.05, 0.1, 0.5, 1
TEMPERATURE
COEFFICIENT
± ppm/°C
5, 10
5, 10
MAXIMUM WORKING
VOLTAGE
(1)
V
200
200
(1)
(2)
(3)
This drawing can be viewed at:
www.dscc.dla.mil/Programs/MilSpec/ListDwgs.asp?DocType=DSCCdwg
Continuous working voltage shall be
P
x
R
or maximum working voltage, whichever is less.
Hot solder dipped leads
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.
TEMPERATURE COEFFICIENT CODES
GLOBAL TC CODE
Z
Y
X
HISTORICAL TC CODE
T-16
T-13
T-10
TEMPERATURE COEFFICIENT
5 ppm/°C
10 ppm/°C
15 ppm/°C
GLOBAL PART NUMBER INFORMATION
New Global Part Numbering: PTF5620K500BYRE (preferred part numbering format)
P
GLOBAL
MODEL
PTF51
PTF56
PTF65
T
F
5
6
2
0
K
5
0
0
B
Y
R
E
SPECIAL
Blank = Standard
(Dash number)
(Up to 3 digits)
From
1 to 999
as applicable
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)
Historical Part Number example: PTF-5620K5BT-13R36 (will continue to be accepted)
RESISTANCE
VALUE
R
=
Ω
K
= kΩ
M
= MΩ
15R000
= 15
Ω
500K00=
500 kΩ
1M0000=
1.0 MΩ
TOLERANCE
CODE
T
=
±
0.01
%
(4)
Q
=
±
0.02
%
(4)
A
=
±
0.05
%
B
=
±
0.1
%
C
=
±
0.25
%
D
=
±
0.5
%
F
=
±
1
%
TEMP.
COEFFICIENT
Z
= 5 ppm
Y
= 10 ppm
X
= 15 ppm
0
= Special
PACKAGING
PTF-56
HISTORICAL
MODEL
20K5
RESISTANCE
VALUE
B
TOLERANCE
CODE
T-13
TEMP.
COEFFICIENT
R36
PACKAGING
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
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For technical questions, contact:
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Document Number: 31019
Revision: 18-Nov-10
PTF
Metal Film Resistors, High Precision, High Stability
Vishay Dale
TECHNICAL SPECIFICATIONS
PARAMETER
Rated Dissipation at 85 °C
Limiting Element Voltage
Insulation Voltage (1 Min)
Thermal Resistance
Terminal Strength, Axial
Insulation Resistance
Category Temperature Range
Failure Rate
Weight (Max.)
UNIT
W
V≅
V
eff
K/W
N
Ω
°C
10
-9
/h
g
PTF51
0.05
200
> 500
< 1300
> 150
≥
10
11
- 55 to + 150
<1
0.11
PTF56
0.125
300
> 500
< 520
> 50
≥
10
11
- 55 to + 150
<1
0.35
PTF65
0.25
500
> 500
260
> 50
≥
10
11
- 55 to + 150
<1
0.75
DIMENSIONS
1.50 ± 0.125
(1)
(38.10 ± 3.18)
L
D
GLOBAL
MODEL
PTF51
DIMENSIONS
in inches (millimeters)
L
D
L
1 max.
0.200
(5.08)
0.300
(7.62)
0.475
(12.07)
d
0.016
(0.41)
0.025
(0.64)
0.025
(0.64)
0.150 ± 0.020 0.070 ± 0.010
(3.81 ± 0.51) (1.78 ± 0.25)
0.250 ± 0.031 0.091 ± 0.009
(6.35 ± 0.79) (2.31 ± 0.23)
0.375 ± 0.062 0.145 ± 0.016
(9.53 ± 1.57) (3.68 ± 0.41)
Note
(1)
1.08 ± 0.125 (27.43 ± 3.18) if tape and reel
L
1 max.
d
PTF56
PTF65
PERFORMANCE
TEST
Life (at Standard Power Ratings)
Thermal Shock
Short Time Overload
Low Temperature Operation
Moisture
Resistance to Soldering Heat
Damp Heat IEC 60068-2-3
Dielectric Withstanding Voltage
CONDITIONS OF TEST
MIL-PRF-55182 Paragraph 4.8.18
1000 h rated power at + 85 °C
MIL-STD-202, Method 107
- 55 °C to + 85 °C
MIL-R-10509, Paragraph 4.7.6
MIL-PRF-55182, Methods 4.8.10
MIL-PRF-55182, Paragraph 4.8.15
MIL-STD-202, Methods 210
56 days at 40 °C and 92 % RH
MIL-STD-202, Methods 301 and 105
TEST RESULTS (TYPICAL TEST LOTS)
≤
± 0.04 %
≤
± 0.02 %
≤
± 0.01 %
≤
± 0.02 %
≤
± 0.08 %
≤
± 0.02 %
≤
± 0.08 %
≤
± 0.01 %
MATERIAL SPECIFICATIONS
Element
Encapsulation
Core
Termination
Precision deposited nickel chrome alloy with controlled annealing
Specially formulated epoxy compounds. Coated construction
Fire-cleanded high purity ceramic
Standard lead material is solder-coated copper. Solderable and weldable
per MIL-STD-1276, Type C.
Document Number: 31019
Revision: 18-Nov-10
For technical questions, contact:
ff2aresistors@vishay.com
www.vishay.com
87
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
CONDITIONS OF TEST
MAXIMUM
ΔR
(TYPICAL TEST LOTS)
LOAD LIFE
MIL-PRF-55182 Paragraph 4.8.18
≤
± 0.04 %
≤
± 0.15 %
≤
± 0.5 %
≤
± 1.0 %
1000 h rated power at + 85 °C
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
RATED POWER IN
%
HEAT RISE (°C ABOVE AMBIENT)
120
100
80
60
40
20
0
- 55
120
100
PTF51
PTF56
PTF65
80
60
40
20
0
0
0.125
0.25
0.375
0.5
0.625
0.75 0.875
1 1.125
APPLIED POWER IN W
- 25
0
25
50
75
100
85
125
150
175
200
DERATING
AMBIENT TEMPERATURE IN °C
THERMAL RESISTANCE
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.
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.
ppm/°C
ADDITIO
N
TO BASE TC I
N
THE
EXPA
N
DED PORTIO
N
OF THE
TEMPERATURE RA
N
GE
4
3
2
1
- 20 °C TO +
85
°C
BASE TC LIMIT
0
- 50 - 40 - 30 - 20
EXPANDED
OPERATING RANGE
- 55 °C TO - 20 °C
X, Y
or Z
90 100 110 120 130 140 150
EXPANDED
OPERATING RANGE
-
85
°C TO + 150 ° C
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.
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For technical questions, contact:
ff2aresistors@vishay.com
Document Number: 31019
Revision: 18-Nov-10
Legal Disclaimer Notice
Vishay
Disclaimer
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE
RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively,
“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other
disclosure relating to any product.
Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or
the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all
liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special,
consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular
purpose, non-infringement and merchantability.
Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of typical
requirements that are often placed on Vishay products in generic applications. Such statements are not binding statements
about the suitability of products for a particular application. It is the customer’s responsibility to validate that a particular
product with the properties described in the product specification is suitable for use in a particular application. Parameters
provided in datasheets and/or specifications may vary in different applications and performance may vary over time. All
operating parameters, including typical parameters, must be validated for each customer application by the customer’s
technical experts. Product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase,
including but not limited to the warranty expressed therein.
Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining
applications or for any other application in which the failure of the Vishay product could result in personal injury or death.
Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk and agree
to fully indemnify and hold Vishay and its distributors harmless from and against any and all claims, liabilities, expenses and
damages arising or resulting in connection with such use or sale, including attorneys fees, even if such claim alleges that Vishay
or its distributor was negligent regarding the design or manufacture of the part. Please contact authorized Vishay personnel to
obtain written terms and conditions regarding products designed for such applications.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by
any conduct of Vishay. Product names and markings noted herein may be trademarks of their respective owners.
Document Number: 91000
Revision: 11-Mar-11
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