Bidirectional TVS Diodes

Whenever the protected line carries voltage of both polarities: AC lines, AC coupled signals, differential pairs and most industrial or automotive buses. A unidirectional part would conduct on the negative half and corrupt the signal, so bidirectional is a requirement rather than a preference on those lines.

Electrically it is symmetric, so there is no polarity in the usual sense. Even so, confirm the pin assignment from the datasheet package drawing, because multi-channel parts have defined channel-to-pin mapping and the marking may still indicate orientation for assembly purposes.

Above the highest voltage the line reaches in either direction during normal operation, including any common mode offset the bus specifies. If the standoff is set only against the nominal signal amplitude, the device may conduct on legitimate signal excursions and corrupt communication.

It depends on the capacitance. A device sized for surge energy usually has capacitance high enough to degrade a fast link noticeably. For high speed differential interfaces, compare low capacitance ESD parts first, and measure the eye diagram and return loss with the part fitted.

With a complete part number, send the part number, quantity, delivery region and the date you need it. If you are still selecting, send the line type, the full signal swing including common mode, the surge standard and the data rate.

Send the line voltage range, surge level and preferred package. Our FAE team will check whether VOOHU can supply a suitable part from its TVS and ESD range and confirm availability.

Usually. Size it on the peak: 24 V AC peaks near 34 V, more at high line. A 58 V part stays off there; check its clamp figure against the equipment behind it.

Only the datasheet is published at present. Use its DO-214AB outline drawing or a standard DO-214AB land pattern, and check pads against the drawing.