SMBJ220A-H

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TVS - Diodes are a form of electrical protection, generally used to protect against voltage “spikes” such as those resulting from lightning and electric surges. SMBJ220A-H is a type of tvs diode that can be used for the purpose of protecting electrical devices from transients or electrostatic events. This diode works by providing a limited voltage between its anode and cathode and can be used for applications ranging from medical equipment protection to consumer electronics.

SMBJ220A-H consists of four terminals that form two serially connected, semiconductor two-terminal diodes, thus acting as two separate paths for current to travel through the device. This construction serves the purpose of providing voltage protection in two directions, such as when current travels in parallel or in both directions. The four terminals of the diode are the Anode (A), Cathode (C), Directional (DI) and Fuse (F).

The Anode and Cathode terminals are obviously responsible for allowing current through the device for protection. The Anode absorbs surge current during normal operation, and the Cathode absorbs surge current in the reverse direction. The Directional (DI) terminal limits the peak surge current that can be released, and is ultimately the protection for the Anode and Cathode terminals.

The Fuse (F) terminal is used when extreme surge current needs to be blocked, as opposed to limited. The Fuse (F) terminal is designed to activate, or “blow”, the fuse when it reaches a pre-set temperature or current level, which then opens and interrupts the circuit, thus preventing further damage.

SMBJ220A-H has a maximum voltage rating of 220V and a maximum peak pulse current of 400A. The device is ideal for most low-voltage applications, including those involving automotive electronics, telecoms, consumer electronics and medical equipment. This means that it can protect electronics against transient voltage from sources like lightning and electric surges as well as electrostatic discharge (ESD).

In summary, SMBJ220A-H is a type of tvs diode designed to provide protection in low-voltage applications from transients and electrical surges. It features four terminals consisting of the Anode, Cathode, Directional, and Fuse and has a maximum voltage of 220V and a peak pulse current of 400A. It is an ideal device for protecting consumer electronics, automotive electronics, telecom equipment and medical equipment against transient voltages, and electrostatic discharge.

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