1280G_10 Datasheet, PDF (1/4 Pages) Vishay Siliconix – Bulk Metal® Foil Technology Ultra High Precision Trimming Potentiometers 3/4" Rectilinear

Accutrim™ 1280G, 1285G
Vishay Foil Resistors
Bulk Metal^® Foil Technology Ultra High Precision
Trimming Potentiometers ³/₄" Rectilinear, ± 5 ppm/°C and
± 15 ppm/°C TCR with a Smooth and Unidirectional Output
FEATURES
INTRODUCTION
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
Wiper Travel
WIREWOUND
Wiper Travel
• 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
• A smooth and unidirectional resistance with leadscrew
adjustment
• Load life stability: 0.5 % maximum ΔR under full rated
power at + 25 °C for 2000 h
• Electrostatic discharge (ESD) up to 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
• Terminal finish: gold plated (tin/lead finish available on
request)
CERMET
Wiper Travel
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
TCR Model 1285G ⁽³⁾
± 15 ppm/°C (- 55 °C to + 125 °C, ref. + 25 °C)
± 5 ppm/°C (- 55 °C to + 125 °C, ref. + 25 °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
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
C.R.V. (noise) ⁽²⁾
2 Ω maximum
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, 1 kΩ, 2 kΩ, 5 kΩ, 10 kΩ, 20 kΩ
Document Number: 63056
Revision: 25-Mar-10
For any questions, contact: [e-mail]
www.foilresistors.com
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