Discussion on various classification and nomenclature of TVS diodes

Discussion on various classification and nomenclature of TVS diodes

What is the so-called TVS  transient suppression diode for? TVS  diodes is a new type of high-efficiency circuit protection component developed on the basis of voltage regulator technology. With its unique advantages (PS level response speed, high transient power, easy control of clamping voltage, small breakdown voltage deviation, low leakage current, high reliability, small volume, low capacitance, etc.), it stands out in the field of circuit protection components and stands out. It is undeniable that the names of TVS diodes are diverse and different people have different names. For this, the key question is, according to what law is it called? How much do you know about the classification of TVS diodes?

SMD TVS  diodes and inline TVS  diodes

TVS   diodes can be divided into SMT TVS diode and inline TVS diodes arrays according to their packaging and internal structure. The SMF, SMAJ, P4SMA, SMBJ, P6SMB, SMCJ, SMDJ and other series of transient suppression diodes are available; The direct insertion TVS tube series includes P6KE, 1.5KE, 5KP and other series. It is not difficult to see that there are various types of TVS tubes, and different circuit protection solutions correspond to different series of TVS tube products.

Bidirectional and unidirectional TVS diodes

TVS  diodes can be divided into bidirectional TVS  diodes and unidirectional TVS diodes according to their polarity. The functional characteristics of a unidirectional TVS transistor are similar to those of a voltage regulator diodes; The functional characteristics of a bidirectional TVS transistor are equivalent to the function of two voltage regulator diodes in reverse series. Once the circuit protection is determined to prevent overvoltage and transient surges, it is believed that many purchasers will require FAE on-site engineers to prioritize testing whether TVS  diode can meet the protection requirements of circuit protection. Generally speaking, unidirectional TVS  diode are used in DC circuits, bidirectional TVS  diode are used in AC circuits, and TVS  diodes arrays are used in multi-channel protection circuits. So, how can we quickly distinguish between single and bidirectional transient suppression diodes?

1) Look at the model: Although different brands have different naming methods for their models, there are still rules. Taking the brand Youfeng Microelectronics as an example, the letter A at the end of the model represents unidirectional, and the letter CA represents bidirectional.

2) Refer to the specification book: it is generally described on the page, with bidirectional conduction and unidirectional conduction;

3) Multimeter test: one-way and one-way, with voltage on both sides in both directions.