ISOTMP35R ±1.5°C, 5kVRMS Reinforced Isolated Temperature Sensor with Analog

Output and 1.06kVRMS Working Voltage

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

VOUT

VDD

GND

Thermal Diodes

TSENSE

TSENSE

TSENSE

Heat only

TSENSE

TSENSE

TSENSE

ISOTMP35R

+

–

90

Ω

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 (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 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 10.

(2)

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

includes pins, where applicable.

ISOTMP35R

SNIS244 – SEPTEMBER 2025

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. ADVANCE INFORMATION for preproduction products; subject to change

without notice.