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.