Vishay recently announced a new QPL series of ultra-high-precision Accutrim trimming potentiometers designed to meet and exceed the requirements of MIL-PRF-22097 Char. F.
For avionics, military and space applications (AMS), the QPL-approved RJ26-style devices offer low end-to-end TCR of ±10 ppm/°C from –55°C to +150°C, +25°C reference, and ±25 ppm/°C through the wiper, load life stability of 0,1% under full rated power at +85°C for 1000 hours, and less than 0,05% typical settability.
The new 1242 series features a bulk metal foil resistive element that possesses inherent temperature and load life stability. Their advanced, virtually backlash-free (<0,005%) adjustment mechanism makes them easy to set quickly and accurately, and maintains that setting through temperature cycling and vibration, as well as thermal and mechanical shock.
Unlike wirewound trimmers that have a single-point contact with the wound element, Vishay Foil trimmers have a multifingered wiper traversing a flat element. The wiper engagement pressure can be much higher when the load is spread out over various wiper tangs, so the sensitivity to shock and vibration in Foil-based trimmers is virtually eliminated for most applications.
In addition to their low TCR and excellent load life stability, the trimmers feature a resistance range from 20 Ω to 5 kΩ, resistance tolerance of ±10%, and 0,25 W power rating at +85°C. The devices are essentially non-inductive with rise times as fast as 1 ns for high-frequency applications. For increased reliability, the trimmers provide high ESD immunity, withstanding electrostatic discharges up to 25 kV.
The 1242 trimmers feature gold-plated terminations with tin/lead terminations on request. Each device is inspected for short-time overload, immersion, resistance tolerance and end resistance. They are sealed against moisture and are available with options including special markings, burn-in and screening operations.
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