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.