1 Features

• AEC-Q100 qualified with:

– Temperature Grade-0: –40°C to 150°C

– Device HBM ESD classification level 2

– Device CDM ESD classification level C5

• Functional Safety-Capable

– Documentation available to aid functional safety

system design

• Robust integrated isolation:

– Withstand isolation voltage: 5kVRMS

– Isolation working voltage: 1.06kVRMS

– Isolation barrier lifetime: > 15 years

– Basic isolation option available

• Temperature sensor accuracy:

– ±0.5°C typical at 25°C

– ±2.5°C maximum from 0°C to 70°C

– ±3.5°C maximum from –40°C to 150°C

• Wide supply range: 3.1V to 34V

• Analog Output:

– 10mV/°C positive slope

– 500mV offset at 0°C

– Output voltage range: 100mV to 2V

• Fast thermal response: < 4s

• High CMTI: 65kV/μs

• Low power consumption: 45μA (typical)

• Safety-related certifications:

– 5kVRMS isolation for 1 minute per UL 1577

2 Applications

• HEV/EV battery-management system (BMS)

• HEV/EV on-board and wireless charger

• HEV/EV DC/DC converter

• HEV/EV inverter and motor control

• Powertrain temperature sensor

3 Description

The ISOTMP35R-Q1 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-Q1 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-Q1 ranges

from 100mV to 2V for a –40°C to 150°C temperature

range. The ISOTMP35R-Q1 does not require any

external calibration or trimming to provide a worstcase

accuracy of ±0.5°C at room temperature and

±3.5°C over the full –40°C to 150°C temperature

range. The linear output, 500mV offset, and factory

calibration of the ISOTMP35R-Q1 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 heatsource

measurement. This reduces the need for timeconsuming

thermal modeling and improves system

design margin by reducing mechanical variations due

to manufacturing and assembly.