1280G_07 Datasheet, PDF (1/4 Pages) Vishay Siliconix – Bulk Metal® Foil Technology Precision Trimming Potentiometers 3/4

1280G, 1285G
Vishay Foil Resistors
Bulk Metal^® Foil Technology
Precision Trimming Potentiometers
3/4" Rectilinear, ± 5 ppm/°C and ± 15 ppm/°C TCR
FEATURES
• Temperature coefficient of resistance (TCR):
(- 55 °C to + 125 °C ref. at + 25 °C)
- ± 15 ppm/°C (model 1280G);
- ± 5 ppm/°C (model 1285G)³⁾;
- through the wiper ± 50 ppm/°C
RoHS
COMPLIANT
• Load life stability: 0.5 % maximum ΔR under full rated
power at + 25 °C for 2000 h
TABLE 1 - 1280G AND 1285G SERIES
ELECTRICAL SPECIFICATIONS
Resistance Tolerance
Model 1280G 10 %¹⁾
Model 1285G 5 %
Resistance Range
10 Ω to 20 kΩ
TCR Model 1280G
± 15 ppm/°C (- 55 °C to + 25 °C)
± 15 ppm/°C (+ 25 °C to + 125 °C)
TCR Model 1285G³⁾
± 5 ppm/°C (- 55 °C to + 25 °C)
± 5 ppm/°C (+ 25 °C to + 125 °C)
Power
0.75 W at + 25 °C derated linearly
to 0 W at + 125 °C (see Fig. 2)
Settability
0.05 % typical; 0.1 % maximum
Setting Stability
0.1 % typical; 0.5 % maximum,
ΔSS
• Electrostatic discharge: above 25 000 V
• Settability: 0.05 % typical; 0.1 % maximum
• Setting stability: 0.1 % typical; 0.5 % maximum, ΔSS
• Power rating: 0.75 W at + 25 °C
• Resistance range: 10 Ω to 20 kΩ
• Resistance tolerance: ± 10 %, ± 5 %
• Backlash: < 0.05 %
• Tap test: 0.05 % typical; 0.1 % maximum
• “O”-ring prevents ingress of fluids during any board
cleaning operation
• Termination: gold plated
Roll-on, Roll-off
0.25 % typical; 1.0 % maximum
Load Life Stability
0.5 % ΔR after 2000 h under full rated
power at + 25 °C
End Resistance
2 Ω maximum
C.R.V.²⁾
3 Ω typical; 10 Ω maximum
Frequency
Characteristics
10 ns rise time at 1 kΩ to 100 MHz
Notes
1. 5 % available on special order
2. The 1280G can be screened for low noise, if required
3. For model 1285G 10 Ω and 20 Ω TCR is ± 10 ppm/°C
4. Panel mount available on special order
TABLE 2 - STANDARD VALUE
10 Ω, 20 Ω, 50 Ω, 100 Ω, 200 Ω, 500 Ω
1K, 2K, 5K, 10K, 20K
TABLE 3 - 1280G AND 1285G SERIES
MECHANICAL SPECIFICATIONS
Adjustment Turns
26 ± 2 turns
Backlash
< 0.05 %
Stops
clutch, wiper idles
Sealed
+ 85 °C water immersion
Torque
5 oz. in. maximum
Weight
1.5 grams maximum
Construction
Case Material
Lead Screw
Wiper
Rider Block
Element
Lead Material
Valox^®
Brass
Precious metal brush
Nylon
Bulk Metal^® Foil
Gold plated phosphor bronze
Document Number: 63056
Revision: 07-Nov-07
For any questions, contact: [e-mail]
www.vishay.com
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