• Digi-Key Corporation

Temperature Switches

From Digi-Key, the ADT6401/ADT6402 is a trip point temperature switch available in a 6-lead SOT-23 package. Each part contains an internal band gap temperature sensor for local temperature sensing. When the temperature crosses the trip point setting, the logic output is activated. The ADT6401 logic output is active low and open-drain. The ADT6402 logic output is active high and push-pull. The temperature is digitized to a resolution of 0.125°C (11-bit). The pin-selectable trip point settings are 10°C apart starting from –45°C to +5°C for under temperature switching, and from 45°C to 115°C for over temperature switching.
These devices typically consume 30 µA of supply current. Hysteresis is pin selectable at 2°C and 10°C. The temperature switch is specified to operate over the supply range of 2.7 V to 5.5 V.
When they're used for monitoring temperatures from 45°C to 115°C, the logic output pin becomes active when the temperature goes higher than the selected trip point temperature. When the ADT6401/ADT6402 is used for monitoring temperatures from –45°C to +5°C, the logic output pin becomes active when the temperature goes lower than the selected trip point temperature.