NEWS
CONTACT US
Industry NewsYou are here：HOME >> NEWS >> Industry News
How to quickly distinguish single and bi-directional TVS diodes
Publish：SHENZHEN ENXIC ELECTRONICS CO., LTD,Schottky diodes, rectifier diodes, fast recovery diodes, switching transistors, thermistors, MOS tube, TVS tube, Youze Electronics Time：2017-11-22 Views:1088
Transient suppression diode or TVS tube, TVS tube has a single and bi-directional distinction, from the surface to see basically no difference, but through the above analysis comparison, one way and two ways have many different. Can two-way TVS tubes be used instead of one way? You Ze electronics Xiaobian recommends that you do not blindly choose. So how do we distinguish the single and bidirectional TVS pipes?
First, how to distinguish the single bidirectional of TVS transient diode.
1. Look at the model. From the surface of the model, we can tell that although different brands have different naming ways, they all have regular patterns.
2, look at the specification book, usually on the first page. <1> bidirectional bidirectional conduction, <2> one-way one-way conduction.
3, using a multimeter
<1> is used to measure the position of diodes, one side and one side, and two sides have voltage.
<2> measurement of DC, two-way symmetry, one-way, only reverse is avalanche breakdown characteristics, general 1mA under test.
4, after all TVS tubes are amplified, there will be a root cathode line. It is used to distinguish the positive and negative poles of diodes, and has nothing to do with one way or two directions.
Two, single / two-way use of different points
1. one way is used in DC. Two-way use is used in communication; unidirectional TVs tube protection devices can only protect the positive or negative pulses, while one end of the bidirectional TVs tube protection device is protected by one end, one end is grounded, both from the reverse or from the forward ESD pulses are released, more effectively protect the IC.
The 2.TVS tube has one way and two directions. The forward characteristic of the unidirectional TVS tube is the same as that of the normal voltage diode, and the hard breakdown near the "right angle" at the reverse breakdown point is a typical PN junction avalanche. When there is an instantaneous overvoltage pulse, the current of the device increases rapidly and the reverse voltage rises to the clamp voltage value, and keeps it at this level. The V-I characteristic curve of the bidirectional TVS tube is like two one-way TVS "back to back" combination, and the positive and negative two directions all have the same avalanche striking characteristics and clamping characteristics, and both sides breakdown both positive and negative. Symmetric relation voltage is more than or equal to 0.9 VBR (positive) /VBR (-) = 1.1. Once the interference voltage at both ends is higher than the clamping voltage, Vc will be suppressed immediately.
3. pole capacitance Cj
The pole capacitance of TVS tube is larger than that of Cj, and the larger the capacitance is, the larger the capacitance is.
4.USB data line all used bi-directional;
5. the current curve is different. The circuit symbol of one direction TVS tube is the same as ordinary voltage regulator tube. Its forward characteristic is the same as that of ordinary diode, and the reverse characteristic is a typical PN junction avalanche device. Bidirectional diodes are typical PN junction avalanche devices.
Three. Can bi-directional TVS tubes be used as one way?
From the market, the TVS tube has a wider range of applications, the lower the better the key parameter capacitance C, which leads to the general use of two-way TVS tubes in the electronic market and small factories. However, through the analysis of the above analysis, one way and two ways have many different, many places can use two-way for two-way, but which is the most important or see the circuit design of the project, some can only use a one-way TVS.
Previous： 2018/06/26
Next：6 typical examples of the application of TVS tube in circuit design 2017/11/04
Next：6 typical examples of the application of TVS tube in circuit design 2017/11/04
- PRODUCTS
- LRC
- Frank
- Embedded module
- TRR浙江明德微
- UTC
- Transistor series（ST、LRC）
- Capacitance series
- Fuse series（DA）
- MOS series
- Resistance series
- CONTACT US
- Tel: 0755-82642360
Fax: 0755-82642380
E-mail: sale@enxic.com
Address: Shenzhen city Longhua District Long Lu Zehua Building ten unit 1009 room
- [QR code]