STMicroelectronics 1-Element Bi-Directional TVS Diode 400 W Surface Mount, 2-Pin DO-214 SM4T68CAY

STMicroelectronics SM4T68CAY is a 1-element bi-directional Transient Voltage Suppressor (TVS) diode designed to protect automotive and industrial electronic circuits from voltage surges and electrostatic discharge effects. Packaged in a compact surface mount DO-214AC (SMA) case with 2 pins, this device provides reliable transient overvoltage protection for sensitive semiconductors under harsh automotive and industrial conditions.

With a peak pulse power dissipation rating of 400 W, it effectively clamps voltage spikes to protect components, featuring a minimum breakdown voltage of 64.4 V and a maximum reverse stand-off voltage of 58 V. Its bi-directional design allows protection in AC and DC applications against transients defined by ISO 7637-2 and electrostatic discharges per ISO 10605.

The SM4T68CAY meets the AEC-Q101 automotive qualification standard, ensuring robust operation in temperature ranges from -55°C to 150°C. Its clamping voltage is 121 V with a peak pulse current capability of 19 A, ensuring efficient surge absorption. The low reverse leakage current of 1 μA helps maintain circuit integrity during normal operation.

Its physical dimensions of 4.6 mm length, 2.9 mm width, and 2.45 mm height make it suitable for compact PCB layouts in automotive control units, power supply circuits, communication modules, and sensor protection. This diode is widely used in automotive electronics, industrial machinery, and power management systems, where transient voltage suppression is critical to maintaining system reliability and longevity.

The device series SM4TxxCAY provides a range of voltages and power ratings in similar packages, allowing design flexibility for different protection voltage requirements. The packaging on reel form facilitates automated assembly and integration in mass production environments.

Provides 400 W peak pulse power dissipation for robust surge protection. Features a bi-directional diode configuration suitable for AC and DC voltage transients. Minimum breakdown voltage of 64.4 V with a maximum reverse stand-off voltage of 58 V.

Compact DO-214AC (SMA) surface mount package measuring 4.6 mm length, 2.9 mm width, and 2.45 mm height. Compliant with automotive standard AEC-Q101 and withstands operating temperatures from -55°C to 150°C. Designed to protect sensitive circuits against ISO 7637-2 surges and ISO 10605 electrostatic discharges.

Has a clamping voltage of 121 V and a maximum peak pulse current of 19 A. Offers low leakage current of 1 μA ensuring minimal interference in normal operation.

For engineers and designers needing reliable transient voltage suppression in automotive or industrial electronic designs, the STMicroelectronics SM4T68CAY offers a high-power, compact, and automotive-qualified solution. Explore more TVS diode products in the Electronics & Electricals category on EnvMart for compatible surge protection devices.