1SMA5943BT3G

The 1SMA5943BT3G is a 56V Zener diode from onsemi's 1SMA59xxBT3G series of 1.5 watt plastic surface mount voltage regulators. It features a standard Zener breakdown voltage range of 3.3 V to 68 V, with this specific device providing 56 V at a test current of typically 200 mA. The diode offers a power dissipation of 1.5 W at a lead temperature of 75°C, with derating above that temperature. It is designed for surface mount applications using the DO-214AC (SMA) package, which provides a low profile and flat handling surface for accurate placement.

Key electrical specifications include a Zener impedance of 86 Ω at the test current, a reverse leakage current of 500 nA at 42.6 V, and a forward voltage of 1.5 V at 200 mA. The device is rated for an operating temperature range of -65°C to 150°C and has a junction-to-ambient thermal resistance of 250°C/W on a standard FR-4 board. The ESD rating is Class 3 (>16 kV) per the Human Body Model, making it suitable for robust designs.

Packaging is tape and reel with a standard quantity of 5000 pieces per reel. The device is Pb-free and has a flammability rating of UL 94 V-0. The SMA package is designed for top slide or bottom circuit board mounting and is an ideal replacement for MELF packages.