MOSFET adds temperature sensor

MOSFET adds temperature sensor

New Products |
By Nick Flaherty

Infineon Technologies has launched a 600V Superjunction MOSFET with an integrated temperature sensor for automotive power management applications.

The Infineon CoolMOS S7TA is designed to meet the specific requirements of automotive electronics with a temperature sensor in the package that significantly improves the accuracy of junction temperature sensing.

 This improves reliability and durability, building on the design of its counterpart for industrial applications, the CoolMOS S7T.

The CoolMOS S7TA is particularly well suited for solid-state relay (SSR) applications, demonstrating superior R DS(on) and sensing accuracy, which is crucial for various automotive electronic devices that rely on efficient power management solutions.

The integration of a Superjunction MOSFET with an embedded temperature sensor in the same package enhances the performance of SSRs and ensures dependable operation even under the most severe overload conditions.

The embedded sensor of the S7TA offers a 40 percent increase in accuracy and up to four times faster response time than standalone on-board sensors. Such advances in temperature monitoring are critical for automotive applications, enabling individual monitoring within multi-device systems, thereby improving reliability, and preventing thermal issues that can lead to system failures.

Superjunction MOSFETs boost ZVS performance

The optimisation includes precise control of the output stage. This level of precision is key to reducing power consumption and energy costs, which is a pressing concern in automotive applications where efficiency translates directly into vehicle range and operational economy. Compared to traditional electromechanical relays, the CoolMOS S7TA offers a significant improvement in total power dissipation.

The CoolMOS S7TA further provides a high overcurrent threshold, which serves to increase the reliability of the SSR and reduce the likelihood of failures. The robust switching solution paves the way for safer operations within the vehicle, and the enhanced robustness of the MOSFETs leads to a longer automotive relay lifecycle, resulting in lower maintenance and replacement costs.

The 600 V CoolMOS S7TA is aimed at critical components such as circuit breakers, encompassing high-voltage battery disconnect switches, low-frequency switches for both direct current (DC) and alternating current (AC), as well as high-voltage electronic fuses (HV eFuses).

Infineon has developed a proof-of-concept board that showcases the robustness and versatility of an automotive eFuse. The EVAL_eFuse_PoC_400V_S7 has an interchangeable power stage that adapts to various operating conditions with different voltage classes and cooling methods.

Both the 600 V CoolMOS S7T in automotive and industrial grades are already available and come in QDPAK TSC and BSC packages, offering a range of R DS(on) from 17 to 40 mΩ. The 10 mΩ variant will be added to the lineup in the second half of 2024. 


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