1242 查看數據表（PDF） - Vishay Semiconductors
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1242 Datasheet PDF : 5 Pages
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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 F8)
(RJ26) 1242 SPECIFICATIONS
TEST GROUP I
Visual and mechanical
No failures
No failures
Total resistance
± 10 %
± 10 %
Actual effective electrical travel
End resistance
10 to 25 turns
± 2 % or 20 Ω7)
21 ± 2 turns
2 Ω (values ≤ 1 kΩ) ; 5 Ω (values ≥ 2 kΩ)
Contact resistance variation - CRV (noise)
± 3.0 % or 3 Ω7)
± 3.0 % or 3 Ω7)
Dielectric withstanding voltage - DWV
Per MIL-STD-202, methods 301 and 105 Per MIL-STD-202, methods 301 and 105
(atmospheric and barometric pressure)
Insulation resistance
> 1000 MΩ
> 1000 MΩ
Shaft torque
3 oz. in. maximum
3 oz. in. maximum
Thermal shock
± 1.0 %
0.1 % typical; 0.5 % maximum
TEST GROUP II
Resistance temperature characteristic - TCR
± 0.01 % (± 100 ppm/°C)
± 0.001 % (10 ppm/°C)
Moisture resistance
± 1.0 %
± 0.5 %
Contact resistance variation - CRV (noise)
± 3.0 % or 3 Ω7)
± 3.0 % or 3 Ω7)
TEST GROUP III
Shock (specified pulse)
± 1.0 %
± 0.5 %
Vibration (high-frequency)
± 1.0 %
± 0.5 %
Contact resistance variation - CRV (noise)
± 3.0 % or 3 Ω7)
± 3.0 % or 3 Ω7)
Salt spray
No corrosion
No corrosion
TEST GROUP IV
Solder heat
± 1.0 %
± 0.1 %
Life (1000 h at 85 °C)
± 2.0 %
± 1.0 %
Contact resistance variation - CRV (noise)
± 3.0 % or 3 Ω7)
± 3.0 % or 3 Ω7)
TEST GROUP V
Low-temperature operation
± 1.0 %
± 0.5 %
High-temperature exposure
± 2.0 %
± 0.5 %
Contact resistance variation - CRV (noise)
± 3.0 % or 3 Ω7)
± 3.0 % or 3 Ω7)
TEST GROUP VI
Rotational life
± 2.0 %
± 2.0 %
Contact resistance variation - CRV (noise)
± 3.0 % or 3 Ω7)
± 3.0 % or 3 Ω7)
Terminal strength
2 lbs.
2 lbs.
TEST GROUP VII
Solderability
MIL-STD-202 method 208
MIL-STD-202 method 208
Immersion
No continuous stream of bubbles
No continuous stream of bubbles
TEST GROUP VIII
MIL-STD-810 method 508
MIL-STD-810 method 508
Fungus
No mechanical damage
No mechanical damage
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
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