1242
Vishay Foil Resistors
Bulk Metal
®
Foil Technology
Precision Trimming Potentiometers, QPL Approved 1/4 Inch
Square, Qualified to MIL-PRF-22097, Char. F, RJ26
FEATURES
•
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
•
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: 50
Ω
to 5 kΩ
•
Resistance tolerance:
±
10 %
•
Terminal finish: gold plated
TABLE 1 - MODEL SELECTION
*
MODEL
1242
(RJ26)
TERMINATION STYLE
W-edge mount, top adjust
X-edge mount, side adjust
AVERAGE
WEIGHT (g)
0.4
STANDARD RESISTANCE
VALUES (in
Ω)
1)
50, 100, 200, 500, 1K, 2K, 5K
STANDARD
TOLERANCE
2)
± 10 %
POWER RATING
at + 85 °C AMBIENT
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)
End-to-end
4)
Through the wiper
5)
Stability
Load life at 1000 h
Power Rating (at + 85 °C)
6)
Settability
Setting Stability
Contact Resistance Variation - CRV (noise)
Hop-off
High-Frequency Operation
Rise time
Inductance
Capacitance
Operating Temperature Range
Note
• See page 3 for footnotes
± 10 ppm/°C maximum (- 55 °C to + 150 °C, 25 °C ref.)
± 25 ppm/°C
0.1 % typical
ΔR
1.0 % maximum
ΔR
(under full rated power of 0.25 W at + 85 °C)
0.25 W
0.05 % typical; 0.1 % maximum
0.1 % typical; 0.5 % maximum
ΔSS
± 3 % or 3
Ω
7)
0.25 % typical; 1.0 % maximum
1.0 ns without ringing
0.08 µH typical
0.5 pF typical
- 55 °C to + 150 °C
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
Document Number: 63052
Revision: 06-Nov-08
For any questions, contact: foil@vishay.com
www.vishay.com
1
1242
Vishay Foil Resistors
Bulk Metal
®
Foil Technology
Precision Trimming Potentiometers, QPL Approved 1/4 Inch
Square, Qualified to MIL-PRF-22097, Char. F, RJ26
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
CW
3
1
2
STANDARD MARKING:
Model No.
Date Code
Resistance Value
Tolerance
3
2
1
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
NOTES:
Adjustment screw 0.070"
(1.78 mm) diameter with
0.020" (0.51 mm) X 0.020"
(0.51 mm) slot. Model 1242
has gold plated terminal
pins 0.016" (0.41 mm) ± 0.001"
(0.03 mm) diameter, 0.200"
1242X
0.040" (1.02 mm) C
0.250" (6.35 mm) D
VISHAY
1
CW
1
2
3
0.050" (1.27 mm) C
0.050" (1.27 mm) C
0.100" (2.54 mm) A
0.050" (1.27 mm) C
0.100" (2.54 mm) A
0.125" (3.18 mm) C
0.175" (4.45 mm) C
2
3
(5.08 mm) length minimum.
TOLERANCES:
A = ± 0.005" (0.13)
C = ± 0.010" (0.25)
D = ± 0.020" (0.51)
0.250" (6.35 mm) D
FIGURE 2 - POWER DERATING CURVE
Percent of Rated Power
+ 100
+ 75
+ 50
+ 25
0
- 75
- 50
- 25
0
+ 25 + 50
+ 75 + 100 + 125 + 150 + 175
+ 85 °C
Ambient Temperature °C
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For any questions, contact: foil@vishay.com
Document Number: 63052
Revision: 06-Nov-08
1242
Bulk Metal
®
Foil Technology
Vishay Foil Resistors
Precision Trimming Potentiometers, QPL Approved 1/4 Inch
Square, Qualified to MIL-PRF-22097, Char. F, RJ26
TABLE 4 - COMPARISON
MIL-PRF-22097/5 CHARACTERISTIC F
8)
TEST GROUP I
Visual and mechanical
Total resistance
Actual effective electrical travel
End resistance
Contact resistance variation - CRV (noise)
Dielectric withstanding voltage - DWV
(atmospheric and barometric pressure)
Insulation resistance
Shaft torque
Thermal shock
TEST GROUP II
Resistance temperature characteristic - TCR
Moisture resistance
Contact resistance variation - CRV (noise)
TEST GROUP III
Shock (specified pulse)
Vibration (high-frequency)
Contact resistance variation - CRV (noise)
Salt spray
TEST GROUP IV
Solder heat
Life (1000 h at 85 °C)
Contact resistance variation - CRV (noise)
TEST GROUP V
Low-temperature operation
High-temperature exposure
Contact resistance variation - CRV (noise)
TEST GROUP VI
Rotational life
Contact resistance variation - CRV (noise)
Terminal strength
TEST GROUP VII
Solderability
Immersion
TEST GROUP VIII
Fungus
MIL-STD-202 method 208
No continuous stream of bubbles
MIL-STD-810 method 508
No mechanical damage
MIL-STD-202 method 208
No continuous stream of bubbles
MIL-STD-810 method 508
No mechanical damage
± 2.0 %
± 3.0 % or 3
Ω
7)
2 lbs.
± 2.0 %
± 3.0 % or 3
Ω
7)
2 lbs.
± 1.0 %
± 2.0 %
± 3.0 % or 3
Ω
7)
± 0.5 %
± 0.5 %
± 3.0 % or 3
Ω
7)
± 1.0 %
± 2.0 %
± 3.0 % or 3
Ω
7)
± 0.1 %
± 1.0 %
± 3.0 % or 3
Ω
7)
± 1.0 %
± 1.0 %
± 3.0 % or 3
Ω
7)
No corrosion
± 0.5 %
± 0.5 %
± 3.0 % or 3
Ω
7)
No corrosion
± 0.01 % (± 100 ppm/°C)
± 1.0 %
± 3.0 % or 3
Ω
7)
± 0.001 % (10 ppm/°C)
± 0.5 %
± 3.0 % or 3
Ω
7)
> 1000 MΩ
3 oz. in. maximum
± 1.0 %
> 1000 MΩ
3 oz. in. maximum
0.1 % typical; 0.5 % maximum
No failures
± 10 %
10 to 25 turns
± 2 % or 20
Ω
7)
± 3.0 % or 3
Ω
7)
Per MIL-STD-202, methods 301 and 105
No failures
± 10 %
21 ± 2 turns
2
Ω
(values
≤
1 kΩ) ; 5
Ω
(values
≥
2 kΩ)
± 3.0 % or 3
Ω
7)
Per MIL-STD-202, methods 301 and 105
(RJ26) 1242 SPECIFICATIONS
Notes
1. 5
Ω,
10
Ω,
and 20
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 for full power at + 85 °C to zero (0) W 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: 06-Nov-08
For any questions, contact: foil@vishay.com
www.vishay.com
3
1242
Vishay Foil Resistors
Bulk Metal
®
Foil Technology
Precision Trimming Potentiometers, QPL Approved 1/4 Inch
Square, Qualified to MIL-PRF-22097, Char. F, RJ26
TABLE 5 - GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBER: Y0057500R000K0L (preferred part number format)
DENOTES PRECISION
Y
VALUE
R
=
Ω
K
= kΩ
AER*
0
= gold plated termination
1 - 999
= custom
Y
0
0
5
7
5
0
0
R
0
0
0
K
0
L
PRODUCT CODE
0057
= 1242W
4057
= 1242X
RESISTANCE TOLERANCE
K
= ± 10.0 %
PACKAGING
L
= bulk pack
FOR EXAMPLE: ABOVE GLOBAL ORDER Y0057 500R000 K 0 L:
TYPE: 1242W
VALUE: 500.0
Ω
ABSOLUTE TOLERANCE: ± 10.0 %
TERMINATION: gold plated
PACKAGING: bulk pack
HISTORICAL PART NUMBER: RJ26 F W 501 (will continue to be used)
RJ26
MODEL
RJ26
F
CHARACTERISTIC
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
MOUNTING TYPE
W, PC pins
(edge mount, top adjust)
X, PC pins
(edge mount, side adjust)
501
RESISTANCE VALUE
First 2 digits significant, last
digit represents the number of
zeros (i.e., 501 = 500
Ω)
Note
* Application engineering release: for non-standard requests, please contact application engineering.
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4
For any questions, contact: foil@vishay.com
Document Number: 63052
Revision: 06-Nov-08
Legal Disclaimer Notice
Vishay
Disclaimer
All product specifications and data are subject to change without notice.
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 herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
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.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless
otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such
applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting
from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding
products designed for such applications.
Product names and markings noted herein may be trademarks of their respective owners.
Document Number: 91000
Revision: 18-Jul-08
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