Texas Instruments ISOTMP35/ISOTMP35-Q1 Isolated Temperature Sensor
Texas Instruments ISOTMP35/ISOTMP35-Q1 Isolated Temperature Sensor is designed with analog output and a fast thermal response of <2 seconds. This sensor combines a robust integrated isolation barrier offering 3000VRMS withstand isolation voltage and 500VRMS isolation working voltage. This integration enables the sensor to be co-located with high-voltage heat sources without requiring expensive isolation circuitry, providing greater accuracy and faster thermal response. The ISOTMP35/ISOTMP35-Q1 sensor operates from a non-isolated 2.3V to 5.5V supply voltage range and allows easy integration into applications where sub-regulated power is unavailable on the high-voltage plane. The ISOTMP35-Q1 temperature sensor is AEC-Q100 qualified for automotive applications. Typical applications include SiC/IGBT PowerFET temperature monitoring, HEV/EV Battery Management System (BMS), HEV/EV On-Board Charger (OBC) and wireless charger, HEV/EV DC/DC converter, and powertrain temperature sensor.
The ISOTMP35/ISOTMP35-Q1 temperature sensor's integrated isolation barrier satisfies UL 1577 requirements. This sensor is packed in a surface-mount package (7-pin SOIC) and provides excellent heat flow from the heat source to the embedded thermal sensor. This minimizes thermal mass, provides more accurate heat-source measurement, and improves system design margin by reducing mechanical variations due to manufacturing and assembly.
Features
- Robust integrated isolation barrier:
- 3000VRMS withstand isolation voltage
- 500VRMS isolation working voltage
- AEC-Q100 qualified with:
- Temperature grade 0: -40°C to 150°C ambient operating temperature range
- Device HBM ESD classification level 2
- Device CDM ESD classification level C5
- Documentation available to aid functional safety system design
- >50 years isolation barrier life
- Temperature sensor accuracy:
- ±0.5°C typical at 25°C
- ±1.5°C maximum from 0°C to 70°C
- ±2.0°C maximum from –40°C to 150°C
- 2.3V to 5.5V operating supply range
- 10mV/°C positive slope sensor gain with 500mV offset at 0°C
- <2 seconds fast thermal response
- Short-circuit protected output
- 9µA (typical) low power consumption
- DFQ (SOIC-7) package
- Safety-related certifications (planned):
- 3kVRMS isolation for 1 minute per UL 1577
Applications
- Silicon Carbide (SiC) PowerFET temperature monitoring
- Insulated-Gate Bipolar Transistor (IGBT) PowerFET temperature monitoring
- HEV/EV BMS
- HEV/EV OBC and wireless charger
- HEV/EV DC/DC converter
- HEV/EV inverter and motor control
- Powertrain temperature sensor
Functional Block Diagram
Typical Application Diagram
Development Tool
Texas Instruments ISOTMP35BEVM Evaluation Module
Facilitates the evaluation of the ISOTMP35 analog isolated temperature sensor.
Published: 2024-07-22
| Updated: 2025-05-15