An easily calibrated precision temperature sensor whose operation is similar to a zener diode. The device has a breakdown voltage directly proportional to absolute temperature & has a linear output equal to 10m VC. The device operates over a current range of 400andmicro A to 5m A 1m A recommended & even when uncalibrated has a typical temperature error of only 2C over its operating range. When calibrated the error is 1C.