1SMB85AT3G

The 1SMB85AT3G is a unidirectional Zener transient voltage suppressor (TVS) diode from Littelfuse. Part of the 1SMB5.0AT3G series, this device is designed to protect sensitive electronic components from high-voltage, high-energy transients. It features a working peak reverse voltage of 85 V and a maximum clamping voltage of 137 V at a peak pulse current of 4.4 A, with a peak power dissipation of 600 W for a 1 ms pulse.

The diode provides a single channel of protection with a fast response time typically less than 1 ns. It has a capacitance of 220 pF at 1 MHz, making it suitable for general-purpose transient suppression. The operating junction temperature range is -65°C to 150°C, ensuring reliable performance in harsh environments.

The device is housed in a void-free, transfer-molded plastic DO-214AA (SMB) package with a modified L-bend lead style, designed for surface mounting. It is supplied in tape and reel packaging with 2,500 pieces per reel, facilitating automated assembly.

Typical applications include communication systems, automotive electronics, industrial controls, power supplies, medical equipment, and business machines. The component is also rated for ESD protection (Class 3, >16 kV per Human Body Model).