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How to distinguish the direction of transient suppression diodes

Commonly used maintenance device transient suppression diode TVS, DC maintenance generally uses unidirectional TVS tube, AC maintenance generally uses bidirectional TVS tube, multi-channel maintenance uses TVS array device, high-power maintenance uses TVS special maintenance module. However, compared with other direct selection applications of circuit maintenance devices, TVS diodes are still single and bidirectional before testing. Although the ultimate role is the same, but the scope of application of single bidirectional TVS diode is still different, bidirectional TVS tube is suitable for AC circuit, unidirectional TVS tube is commonly used for DC circuit. Novice engineers can't quickly identify the single and bidirectional of TVS diodes when they just contact TVS diodes. The purpose of this article is to teach you how to identify the direction of transient suppression diodes:

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Look at the model. We can tell from the appearance of the model alone. Although different brands are named in different ways, they all have rules: for example, electronic transient suppression diode SMBJ15CA and SMBJ15CA represent one-way ca represents two-way. Look at the specifications, usually on the first page. <1> two-way for double tour guide,<2> one-way for single tour guide,

Use a multimeter to measure:<1> measure the gear of the diode, one side is connected, and both sides have voltage in both directions;<2> DC measurement, bidirectional symmetry, unidirectional as long as the reverse direction is avalanche breakdown characteristic, ordinary 1mA measurement. All TVS tubes will have a cathode line after amplification, which is used to distinguish the positive and negative poles of the diode, and has nothing to do with single and two-way.

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