The SM8Z30A is a supplier-specific, bi-directional, unidirectional, transient voltage suppression (TVS) device with DO-218AB encapsulation. It is produced by Dowo, and is RoHS compliant. This device works as both an overvoltage and an undershoot protection for electronic circuits, protecting them from voltage or current spikes. The particular SM8Z30A model provides protection up to 48.4V, 33.3V and 30V. It is ideal for use with 12V, 24V, and 36V based systems.