1 Features
• 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
– ±1.5°C maximum from 0°C to 70°C
– ±2.5°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)
• DFP (SSOP-12) package
• Safety-related certifications (planned):
– 5kVRMS isolation for 1 minute per UL 1577

2 Applications
• AC charging (pile) station
• DC fast charging station
• Rack and server PSU with 48V output
• Server PSU with 12V output
• Merchant DC/DC
• Merchant telecom rectifier
• Battery backup unit
• Merchant DIN rail power supply
• AC/DC adapter PSU

3 Description
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 (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 allows easy integration into applications
where subregulated power is not available on the
high-voltage plane.
The best output voltage of the ISOTMP35R ranges
from 100mV to 2V 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 ±2.5°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 heatsource
measurement. This reduces the need for timeconsuming
thermal modeling and improves system
design margin by reducing mechanical variations due
to manufacturing and assembly.