Texas Instruments ISOTMP35R/-Q1 Analog Temperature Sensors

Introduction

The Texas Instruments ISOTMP35R/-Q1 is a reinforced isolated analog temperature sensor IC designed for accurate temperature monitoring in electrically demanding systems. It combines temperature sensing and a high-voltage isolation barrier in one device, simplifying designs that need to measure temperatures across isolation boundaries.

Part Description

The ISOTMP35R/-Q1 provides an analog output with a linear 10 mV/°C slope and a 500 mV output offset at 0°C. This predictable output characteristic enables straightforward connection to analog-to-digital converters, monitoring circuits, and control systems.

Key characteristics include:

• Analog temperature measurement from -40°C to +150°C
• 10 mV/°C analog output slope
• 500 mV output at 0°C
• Operating supply range of 3.1 V to 34 V
• Integrated reinforced isolation barrier
• 5 kVRMS reinforced isolation
• Compact solution for isolated temperature-monitoring circuits
• The ISOTMP35R-Q1 version is AEC-Q100 qualified for automotive applications

By integrating isolation directly into the temperature sensor, the device can reduce component count and help designers avoid separate isolation amplifiers or complex isolated sensing arrangements.

Applications

Potential applications for the ISOTMP35R/-Q1 include:

• Electric vehicle traction inverter temperature monitoring
• On-board charger thermal management
• High-voltage battery management systems
• Automotive powertrain electronics
• Industrial motor-drive temperature sensing
• Solar inverter thermal protection
• Energy-storage system monitoring
• Isolated power-supply temperature measurement
• High-voltage DC/DC converter monitoring
• Factory automation equipment
• Charging-station power electronics
• Grid-connected power conversion systems

Industries

The ISOTMP35R/-Q1 can be used in a range of industries, including:

• Automotive and electric mobility
• Industrial automation
• Renewable energy
• Energy storage
• Power conversion and power supplies
• EV charging infrastructure
• Smart-grid and utility equipment
• Robotics and motion control
• Test and measurement
• Aerospace and transportation electronics

Usage Ideas

1. EV Inverter Thermal Monitor
   Use the sensor to measure the temperature near an inverter power module while maintaining reinforced isolation between the high-voltage stage and low-voltage vehicle controller.

2. Industrial Motor Drive Protection
   Place the device near a motor-drive power stage and connect its analog output to a controller ADC for overtemperature warnings, fan control, or controlled shutdown.

3. Solar Inverter Heat-Sink Monitor
   Integrate the sensor into a solar inverter to track heat-sink or power-module temperatures and adjust operating power when thermal limits are approached.

Conclusion

The Texas Instruments ISOTMP35R/-Q1 offers a practical solution for isolated analog temperature measurement in high-voltage and high-reliability electronic systems. Its integrated 5 kVRMS reinforced isolation, wide operating supply range, linear analog output, and temperature range from -40°C to +150°C make it well suited for industrial power systems, renewable-energy equipment, and automotive electrification designs. The AEC-Q100-qualified ISOTMP35R-Q1 variant is especially appropriate for demanding automotive thermal-monitoring applications.