Accutrim™ ꢃ280G, ꢃ28ꢀG
Vishay Foil Resistors
Bulk Metal® Foil Technology Ultra High Precision
Trimming Potentiometers 3/4" Rectilinear, ꢀ ꢁꢁm/ꢂ° and
ꢃꢀ ꢁꢁm/ꢂ° T°R with a Smooth and Unidirectional Outꢁut
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
INTRODUCTION
• A smooth and unidirectional resistance with leadscrew
adjustment
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.
• 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
BULK METAL
• Resistance tolerance: 10 %, 5 %
• Backlash: < 0.05 %
WIREWOUND
FOIL
• Tap test: 0.05 % typical; 0.1 % maximum
Wiꢁer Travel
Wiꢁer Travel
• “O”-ring prevents ingress of fluids during any board
cleaning operation
• Terminal finish: gold plated (tin/lead finish available on
request)
°ERMET
Wiꢁer Travel
TABLE 1 - 1280G AND 1285G SERIES ELECTRICAL SPECIFICATIONS
Resistance Tolerance
Resistance Range
T°R Model ꢃ280G
T°R Model ꢃ28ꢀG (3)
Power
Model 1280G 10 % (1), Model 1285G 5 %
10 Ω to 20 kΩ
15 ppm/°C (- 55 °C to + 125 °C, ref. + 25 °C)
5 ppm/°C (- 55 °C to + 125 °C, ref. + 25 °C)
0.75 W at + 25 °C derated linearly to 0 W at + 125 °C (see Fig. 2)
0.05 % typical; 0.1 % maximum
Settability
Setting Stability
Roll-on, Roll-off
Load Life Stability
End Resistance
°.R.V. (noise) (2)
Frequency °haracteristics
0.1 % typical; 0.5 % maximum
0.25 % typical; 1.0 % maximum
0.5 % ΔR after 2000 h under full rated power at + 25 °C
2 Ω maximum
3 Ω typical; 10 Ω maximum
10 ns rise time at 1 k
Ω to 100 MHz
Notes
(1)
(2)
(3)
(4)
5 % available on special order
The 1280G can be screened for low noise, if required
For model 1285G 10 Ω and 20 Ω TCR is 10 ppm/°C
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: foil@vishaypg.com
www.foilresistors.com
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