How to distinguish between single and bidirectional TVS diodes?

How to distinguish between single and bidirectional TVS diodes?

Bi directional unit, abbreviated as Bi; Unidirectional unit, abbreviated as Uni. The most reliable way to distinguish between single and bidirectional TVS diodes is to refer to the product manual corresponding to the part number, where the Bi list represents bidirectional and the Uni list represents unidirectional. Of course, it can also be more intuitively distinguished based on the model. The tail patch CA of the TVS diodes model is bidirectional, and if A is unidirectional, for example, 3KP33CA is a bidirectional TVS diodes and 3KP33A is a unidirectional TVS. Of course, there are slight differences in the naming method of TVS diodes models among different brand suppliers. Generally speaking, they are all standardized models according to national standards, and there will not be significant differences. Of course, a multimeter can also be used to test and determine whether a single or dual TVS test has voltage on both sides, while a one-way TVS test has voltage on one side.