1242 Datasheet, PDF (1/5 Pages) Vishay Siliconix – Bulk Metal® Foil Technology Precision Trimming Potentiometers, QPL Approved 1/4 Inch

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 maximum⁴⁾ (- 55 °C to + 150 °C ref.
at + 25 °C); through the wiper⁵⁾; ± 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
TERMINATION STYLE
AVERAGE
WEIGHT (g)
1242
(RJ26)
W-edge mount, top adjust
X-edge mount, side adjust
0.4
Note
* See figure 1
STANDARD RESISTANCE
VALUES (in Ω)¹⁾
50, 100, 200, 500, 1K, 2K, 5K
STANDARD
TOLERANCE²⁾
± 10 %
POWER RATING
at + 85 °C AMBIENT
0.25 W
NO. OF
TURNS
21 ± 2
TABLE 2 - 1242 (RJ26) SERIES ELECTRICAL SPECIFICATIONS³⁾
Temperature Coefficient of Resistance (TCR)
End-to-end⁴⁾
Through the wiper⁵⁾
± 10 ppm/°C maximum (- 55 °C to + 150 °C, 25 °C ref.)
± 25 ppm/°C
Stability
Load life at 1000 h
Power Rating (at + 85 °C)⁶⁾
0.1 % typical ΔR
1.0 % maximum ΔR (under full rated power of 0.25 W at + 85 °C)
0.25 W
Settability
0.05 % typical; 0.1 % maximum
Setting Stability
Contact Resistance Variation - CRV (noise)
0.1 % typical; 0.5 % maximum ΔSS
± 3 % or 3 Ω⁷⁾
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
TABLE 3 - MECHANICAL SPECIFICATIONS
Adjustment Turns
21 ± 2
Mechanical Stops
Wiper idles - no discontinuity
Internal Terminations
All welded - no flux
Case Material
Diallyl-phthalate: green (DAP)
Shaft Torque
3 oz. in. maximum
Backlash
0.005 % typical
Document Number: 63052
Revision: 06-Nov-08
For any questions, contact: [e-mail]
www.vishay.com
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