Product Index > Sensors, Transducers > Temperature Sensors

Temperature Sensors

Families

Types

NTC Thermistors

Negative Temperature Coefficient (NTC) Thermistors have an increase in resistance as temperature decreases and a decrease in resistance as temperature increases. Thermistors are commonly specified in Ohms at 25°C (77°F).

Resistance in Ohms at 25°C
0 ~ 100 Ohms 101 ~ 1k Ohms 1.01k ~ 2k Ohms 2.01k ~ 3k Ohms 3.01k ~ 4k Ohms 4.01k ~ 5k Ohms	5.01k ~ 10k Ohms 10.01k ~ 25k Ohms 25.01k ~ 50k Ohms 50.01k ~ 100k Ohms 100.01k Ohms and up

PTC Thermistors

Positive Temperature Coefficient (PTC) Thermistors have a decrease in resistance as temperature decreases and an increase in resistance as temperature increases. Thermistors are commonly specified in Ohms at 25°C (77°F).

Resistance in Ohms at 25°C
0 ~ 100 Ohms 101 ~ 1k Ohms	1k Ohms and up

Analog and Digital Output

A temperature transducer converts a temperature to a digital or analog signal. Digi-Key offers options for local, remote, combined local or remote, and infrared (IR). They are available with multiple features, wide temperature ranges and in many package types.

Local - Sensor on chip
Remote - Sensor off chip

Analog

Digital

Thermostats (Mechanical)

Temperature regulators are mechanical switches that are activated at a specific temperature. Digi-Key offers options in single pole, single throw (SPST) normally-open (NO) or normally-closed (NC).

Switching Temperature

Circuit

Thermostats (Solid State)

Temperature switches are solid state switches that operate at a specified temperature. Unlike mechanical temperature regulators, solid state temperature switches have longer lifetimes and can trip hot or cold. This establishes an exact trip point and that the hysteresis is in the desired direction

Switching Temperature

Trip Temperature Threshold