ISOTMP35R

The ISOTMP35R is the industry’s first reinforced isolated temperature sensor IC, combining an integrated isolation barrier, up to 5kVRMS withstand voltage, with an analog temperature sensor featuring a 10mV/°C slope from –40°C to 150°C. This integration enables the sensor to be co-located with high-voltage heat sources such as power MOSFETs, IGBTs, and busbars eliminating the need for external isolation amplifiers or isolated data converters. The direct contact with the high-voltage heat source also provides greater accuracy and faster thermal response compared with approaches where the sensor is placed further away to meet isolation requirements.

Operating from a wide supply range of 3.1V to 34V, the ISOTMP35R enables flexible integration in systems where a regulated low-voltage rail is not available on the high-voltage domain.

The output voltage of the ISOTMP35R ranges from 100mV to 2.0V for a –40°C to 150°C temperature range. The ISOTMP35R does not require any external calibration or trimming to provide a worst-case accuracy of ±0.5°C at room temperature and ±3.0°C over the full –40°C to 150°C temperature range. The linear output, 500mV offset, and factory calibration of the ISOTMP35R simplify the circuitry requirements in a single supply environment where reading negative temperatures is necessary.

The integrated isolation barrier satisfies UL 1577 requirements. The surface mount package (12-pin SSOP) provides excellent heat flow from the heat source to the embedded thermal sensor, minimizing thermal mass and providing more accurate heat-source measurement. This reduces the need for time-consuming thermal modeling and improves system design margin by reducing mechanical variations due to manufacturing and assembly.