ISOTMP35R ±2.0°C, 5kVRMS Reinforced Isolated, Analog Temperature Sensor

(10mV/°C) With Fast Response Time (< 4s) and 1.06kVRMS Working Voltage

1 Features

• 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

– ±2.0°C maximum from 0°C to 70°C

– ±3.0°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 2.0V

• Fast thermal response: < 4s

• High CMTI: 65kV/µs

• Low power consumption: 45µA (typical)

• DFP (SSOP-12) package

• Safety-related certifications:

– 5kVRMS isolation for 1 minute per UL 1577

2 Applications

• AC charging 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

V

OUT

V

DD

GND

Thermal Diodes

TSENSE

TSENSE

TSENSE

TSENSE

TSENSE

TSENSE

ISOTMP35R

+

–

90

HEAT ONLY

Functional Block Diagram

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 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 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 ranges from

100mV to 2.0V 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 ±3.0°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 heat-

source measurement. This reduces the need for time-

consuming thermal modeling and improves system

design margin by reducing mechanical variations due

to manufacturing and assembly.

Packaging Information

PART NUMBER

PACKAGE(1)

PACKAGE SIZE(2)

ISOTMP35R

DFP (SSOP, 12)

10.3mm × 3.6mm

(1)

For more information, see Section 11.

(2)

The package size (length × width) is a nominal value and

includes pins, where applicable.

ISOTMP35R

SNIS244A – SEPTEMBER 2025 – REVISED MAY 2026

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.