Accutrim™ 1242 (QPL)
Vishay Foil Resistors
Bulk Metal® Foil Technology Ultra High Precision Trimming
Potentiometers, QPL Approved 1/4" Square, Qualified to
MIL-PRF-22097, Char. F, RJ26 with a Smooth and Unidirectional Output
FEATURES
Resistance
Resistance
Vishay Foil precision trimmers have the Bulk Metal® Foil
resistive element which possesses a unique inherent
temperature and load life stability. Plus, their advanced
virtually back lash-free adjustment mechanism makes them
easy to set quickly and accurately and keeps the setting
exactly on target.
BULK METAL
FOIL
Resistance
INTRODUCTION
• Temperature coefficient of resistance (TCR):
± 10 ppm/°C maximum (4) (- 55 °C to + 150 °C ref. at
+ 25 °C); through the wiper (5); ± 25 ppm/°C
• A smooth and unidirectional resistance with leadscrew
adjustment
• Load life stability: 0.1 % typical ΔR, 1.0 % maximum ΔR
under full rated power of 0.25 W at 85 °C for 1000 h
• Settability: 0.05 % typical; 0.1 % maximum
• Setting stability: 0.1 % typical; 0.5 % maximum, ΔSS
• Power rating: 0.25 W at + 85 °C
• Resistance range: 20 Ω to 5 kΩ
• Resistance tolerance: ± 10 %
• Electrostatic discharge (ESD) up to 25 000 V
• Terminal finish: gold plated (tin/lead finish is available on
request)
WIREWOUND
Wiper Travel
Wiper Travel
CERMET
Wiper Travel
TABLE 1 - MODEL SELECTION
MODEL
1242
(RJ26)
TERMINATION STYLE
W-edge mount, top adjust
X-edge mount, side adjust
AVERAGE
WEIGHT (g)
STANDARD RESISTANCE
VALUES (in Ω) (1)
0.4
20, 50, 100, 200, 500,
1K, 2K, 5K
STANDARD
POWER RATING
TOLERANCE (2) at + 85 °C AMBIENT
± 10 %
0.25 W
NO. OF
TURNS
21 ± 2
Note
• See figure 1
TABLE 2 - 1242 (RJ26) SERIES ELECTRICAL SPECIFICATIONS
(3)
Temperature Coefficient of Resistance (TCR), 50 Ω to 10 kΩ
End-to-end (4)
± 10 ppm/°C maximum (- 55 °C to + 150 °C, 25 °C ref.)
Temperature Coefficient of Resistance (TCR), 5 Ω, 10 Ω and 20 Ω
End-to-end (4)
± 20 ppm/°C
Through the wiper
(5)
± 25 ppm/°C
Stability
Load life at 1000 h
0.1 % typical ΔR
1.0 % maximum ΔR (under full rated power of 0.25 W at + 85 °C)
Power Rating (at + 85 °C) (6)
0.25 W
Settability
0.05 % typical; 0.1 % maximum
Setting Stability
0.1 % typical; 0.5 % maximum ΔSS
Contact Resistance Variation - CRV (noise)
± 3 % or 3 Ω (7)
Hop-off
0.25 % typical; 1.0 % maximum
High-Frequency Operation
Rise time
Inductance
Capacitance
1.0 ns without ringing
0.08 µH typical
0.5 pF typical
Operating Temperature Range
- 55 °C to + 150 °C
Note
• See page 3 for footnotes
Document Number: 63052
Revision: 23-Mar-10
For any questions, contact: foil@vishaypg.com
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1
Accutrim™ 1242 (QPL)
Vishay Foil Resistors
TABLE 3 - MECHANICAL SPECIFICATIONS
Adjustment Turns
Mechanical Stops
Internal Terminations
Case Material
Shaft Torque
Backlash
21 ± 2
Wiper idles - no discontinuity
All welded - no flux
Diallyl-phthalate: green (DAP)
3 oz. in. maximum
0.005 % typical
FIGURE 1 - SCHEMATIC AND DIMENSIONS in Inches (Millimeters)
1242W 0.040" (1.02 mm) C
0.040" (1.02 mm) C
VISHAY
0.250" (6.35 mm) D
2
CW
3
1
STANDARD MARKING:
Model No.
2
3
1
Date Code
Resistance Value
0.250" (6.35 mm) D
Tolerance
0.050" (1.27 mm) C
0.175" (4.45 mm) C
0.100" (2.54 mm) A
0.050" (1.27 mm) C
0.100" (2.54 mm) A
NOTES:
Adjustment screw 0.070"
(1.78 mm) diameter with
0.020" (0.51 mm) X 0.020"
0.125" (3.18 mm) C
1242X
(0.51 mm) slot. Model 1242
0.040" (1.02 mm) C
has gold plated terminal
pins 0.016" (0.41 mm) ± 0.001"
(0.03 mm) diameter, 0.200"
0.250" (6.35 mm) D
VISHAY
(5.08 mm) length minimum.
1
3
CW
1
2
TOLERANCES:
A = ± 0.005" (0.13)
2
3
C = ± 0.010" (0.25)
D = ± 0.020" (0.51)
0.050" (1.27 mm) C
0.250" (6.35 mm) D
0.050" (1.27 mm) C
0.100" (2.54 mm) A
0.175" (4.45 mm) C
0.050" (1.27 mm) C
0.100" (2.54 mm) A
0.125" (3.18 mm) C
Percent of Rated Power
FIGURE 2 - POWER DERATING CURVE
+ 85 °C
+ 100
+ 75
+ 50
+ 25
0
- 75
- 50
- 25
0
+ 25
+ 50
+ 75 + 100 + 125 + 150 + 175
Ambient Temperature °C
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For any questions, contact: foil@vishaypg.com
Document Number: 63052
Revision: 23-Mar-10
Accutrim™ 1242 (QPL)
Vishay Foil Resistors
TABLE 4 - COMPARISON
MIL-PRF-22097/5 CHARACTERISTIC F (8)
(RJ26) 1242 SPECIFICATIONS
No failures
No failures
TEST GROUP I
Visual and mechanical
Total resistance
± 10 %
± 10 %
10 to 25 turns
21 ± 2 turns
End resistance
± 2 % or 20 Ω (7)
2 Ω (values ≤ 1 kΩ) ; 5 Ω (values ≥ 2 kΩ)
Contact resistance variation - CRV (noise)
± 3.0 % or 3 Ω (7)
± 3.0 % or 3 Ω (7)
Atmospheric pressure
600 VAC, 1 min
600 VAC, 1 min
Barometric pressure
250 VAC, 1 min
250 VAC, 1 min
Insulation resistance
> 1000 MΩ
> 1000 MΩ
3 oz. in. maximum
3 oz. in. maximum
± 1.0 %
0.1 % typical; 0.5 % maximum
± 0.01 %/°C (± 100 ppm/°C)
± 0.001 %/°C (± 10 ppm/°C)
Actual effective electrical travel
Dielectric withstanding voltage - DWV
Per MIL-STD-202, methods 301 and 105
Shaft torque
Thermal shock
TEST GROUP II
Resistance temperature characteristic - TCR
Moisture resistance
Contact resistance variation - CRV (noise)
± 1.0 %
± 0.5 %
± 3.0 % or 3 Ω (7)
± 3.0 % or 3 Ω (7)
TEST GROUP III
Shock (specified pulse)
± 1.0 %
± 0.5 %
Vibration (high-frequency)
± 1.0 %
± 0.5 %
± 3.0 % or 3 Ω (7)
± 3.0 % or 3 Ω (7)
No corrosion
No corrosion
Contact resistance variation - CRV (noise)
Salt spray
TEST GROUP IV
Solder heat
± 1.0 %
± 0.1 %
Life (1000 h at 85 °C)
± 2.0 %
± 1.0 %
± 3.0 % or 3 Ω (7)
± 3.0 % or 3 Ω (7)
Low-temperature operation
± 1.0 %
± 0.5 %
High-temperature exposure
± 2.0 %
± 0.5 %
± 3.0 % or 3 Ω (7)
± 3.0 % or 3 Ω (7)
Contact resistance variation - CRV (noise)
TEST GROUP V
Contact resistance variation - CRV (noise)
TEST GROUP VI
Rotational life
Contact resistance variation - CRV (noise)
Terminal strength
± 2.0 %
± 2.0 %
± 3.0 % or 3 Ω (7)
± 3.0 % or 3 Ω (7)
2 lbs.
2 lbs.
TEST GROUP VII
Solderability
Immersion
TEST GROUP VIII
Fungus
MIL-STD-202 method 208
MIL-STD-202 method 208
No continuous stream of bubbles
No continuous stream of bubbles
MIL-STD-810 method 508
MIL-STD-810 method 508
No mechanical damage
No mechanical damage
Notes
(1) 5 Ω and 10 Ω resistance values available on special order.
(2) 5 % resistance tolerance available on special order.
(3) Maximum is 1.0 % A.Q.L. standard for all specifications except TCR. (For TCR information, see notes 4 and 5.) “Typical” is a designers
reference which represents that 85 % of the lots supplied, over a long period of time, will be at least the figure shown or better.
(4) Maximum TCR applies to the 3 σ (sigma) limit or 99.73 % of a production lot. (Measured end-to-end with wiper off the element.)
(5) Measurements of TCR through the wiper are influenced more by setting stability and the percentage of the total/resistance in use (at the wiper)
than by fundamental resistance change due to temperature alone. The parameter shown in table 2 is a 2 s distribution typifying the behavior
of the device when used with 40 % or more of the total resistance in use.
(6) Derated linearly from full power at + 85 °C to zero power at + 150 °C. See figure 2 on previous page.
(7) Whichever is greater.
(8) All ΔR’s are measured to the tolerance specified + 0.01 Ω.
Document Number: 63052
Revision: 23-Mar-10
For any questions, contact: foil@vishaypg.com
www.foilresistors.com
3
Accutrim™ 1242 (QPL)
Vishay Foil Resistors
TABLE 5 - GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBER: Y0057500R000K0L (preferred part number format)
DENOTES PRECISION
VALUE
CHARACTERISTICS (1)
Y
R=Ω
K = kΩ
0 = gold plated termination (lead (Pb)-free)
1 to 999 = custom
Y
0
0
5
7
5
PRODUCT CODE
0
0
R
0
0
RESISTANCE TOLERANCE
0057 = 1242W
4057 = 1242X
0
K
0
L
PACKAGING
K = ± 10.0 %
L = foam/box pack
FOR EXAMPLE: ABOVE GLOBAL ORDER Y0057 500R000 K 0 L:
TYPE: 1242W
VALUE: 500.0 Ω
ABSOLUTE TOLERANCE: ± 10.0 %
TERMINATION: gold plated (lead (Pb)-free)
PACKAGING: foam/box pack
HISTORICAL PART NUMBER: RJ26 F W 501 (will continue to be used)
RJ26
F
W
501
MODEL
CHARACTERISTIC
MOUNTING TYPE
RJ26
Having specifications
per table 1 of MIL-PRF-22097
(i.e., TCR of 100 ppm/°C,
power rating of 0.25 W at
+ 85 °C and improved
environmental specifications)
W, PC pins
(edge mount, top adjust)
RESISTANCE VALUE
First 2 digits significant, last
digit represents the number of
zeros (i.e., 501 = 500 Ω)
X, PC pins
(edge mount, side adjust)
Note
(1)
For non-standard requests, please contact application engineering.
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For any questions, contact: foil@vishaypg.com
Document Number: 63052
Revision: 23-Mar-10
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Vishay Precision Group, Inc.
Disclaimer
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Document No.: 63999
Revision: 15-Jul-2014
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