1 Features

• AEC-Q100 qualified with:

– Temperature grade 0: –40°C to 150°C TA

– 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 barrier:

– Withstand isolation voltage: 5kVRMS

– Isolation working voltage: 1.06kVRMS

• Isolation barrier life: >30 years

• 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

• Operating supply range: 3V to 34V

• Positive slope sensor gain: 10mV/°C

• Sensor offset: 500mV at 0°C

• Fast thermal response: <4s

• Short circuit protected output

• Low power consumption: 45μA (typical)

• Safety-related certifications (planned):

– 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

• SiC PowerFET temperature monitoring

• IGBT PowerFET temperature monitoring

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 (for example: HV

FETs, IGBTs, or HV contactors) without requiring

expensive isolation circuitry. 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 non-isolated 3V to 34V supply,

the ISOTMP35R-Q1 allows easy integration into

applications where subregulated power is not

available on the high-voltage plane.

The best 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 worst-case 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.