STMicroelectronics

SM4T21CAY

SM4T21CAY Description

The SM4T21CAY is a high-performance TVS diode designed and manufactured by STMicroelectronics. It is part of the SM4TY, TRANSIL™ series and is specifically tailored for automotive applications. This Zener diode is surface-mounted and comes in a tape & reel packaging, making it ideal for automated assembly processes. With a peak pulse power rating of 400W and a peak pulse current of 59A (8/20µs), the SM4T21CAY is designed to handle high-energy transients, ensuring robust protection for sensitive electronic components.

SM4T21CAY Features

• Voltage Ratings: The SM4T21CAY boasts a reverse standoff voltage of 18V and a clamping voltage of 39.3V at the peak pulse current. This ensures reliable operation within the specified voltage range while providing effective protection against voltage spikes.
• Current Handling: With a peak pulse current of 59A (8/20µs) and a continuous current rating of 1mA, the SM4T21CAY can handle both high-energy transients and low-level continuous currents, making it suitable for a wide range of applications.
• Power Line Protection: Although the SM4T21CAY does not offer power line protection, its high-energy handling capability makes it an excellent choice for protecting sensitive electronic components from voltage transients.
• Moisture Sensitivity Level (MSL): The SM4T21CAY has an MSL of 1, indicating that it can be stored and handled without any special precautions, making it suitable for a wide range of manufacturing environments.
• REACH Compliance: The SM4T21CAY is REACH unaffected, ensuring compliance with the European Union's regulations on the Registration, Evaluation, Authorization, and Restriction of Chemicals (REACH).
• RoHS Compliance: The SM4T21CAY is RoHS3 compliant, meeting the European Union's restrictions on hazardous substances in electronic components.

SM4T21CAY Applications

The SM4T21CAY is ideal for a variety of automotive applications, including:

• Infotainment Systems: Protecting sensitive electronic components from voltage transients caused by power surges or electrical noise.
• Sensors and Actuators: Ensuring reliable operation of sensors and actuators by safeguarding them against voltage spikes and electrostatic discharge (ESD) events.
• Power Supplies: Providing overvoltage protection for automotive power supplies, ensuring stable operation and extending the life of electronic components.

Conclusion of SM4T21CAY

The SM4T21CAY is a versatile and high-performance TVS diode designed for automotive applications. Its robust voltage and current ratings, combined with its REACH and RoHS compliance, make it an excellent choice for protecting sensitive electronic components from voltage transients. With its surface-mount packaging and tape & reel format, the SM4T21CAY is well-suited for automated assembly processes, ensuring reliable protection for a wide range of automotive systems.