BETASMBJ5.0AUnidirectional transient suppressor
Give a voltage spike a short path to ground.
SMBJ5.0A is a unidirectional transient-voltage suppressor. It connects across a protected DC rail, with its banded cathode at the positive node and its anode at ground. A short, low-inductance return helps divert surge current away from the load. The stand-off voltage, breakdown voltage and clamping voltage describe different conditions. A 5 V stand-off rating does not mean the rail will be held at exactly 5 V during a surge. The protected circuit must tolerate the actual clamp voltage, including wiring overshoot. This reference follows Vishay’s commercial SMB part. The diagram illustrates a protected 5 V input with a fuse and upstream source impedance. The fuse handles sustained faults; the TVS handles appropriately limited transients. Select both from the real source, load and pulse requirements.
