Characteristics and classification of transient suppression diodes

Features:

1. Adding TVS diodes to the signal and power lines can prevent the microprocessor or single-chip microcomputer from malfunctioning due to instantaneous pulses, such as electrostatic discharge effects, AC power surges and switching power supply noise.

2. The electrostatic discharge effect can release pulses exceeding 10000V and 60A, and can last for 10ms; while general TTL devices will be damaged when they encounter 10V pulses exceeding 30ms. Using TVS diodes can effectively absorb pulses that can cause device damage, and can eliminate interference (Crosstalk) caused by switches between buses.

3. Place the TVS diode between the signal line and the ground to prevent unnecessary noise from the data and control bus.

Classification:

TVS devices can be divided into unipolar and bipolar according to polarity, and can be divided into general-purpose devices suitable for various circuits and special-purpose devices suitable for special circuits according to their uses. Such as: various AC voltage protectors, 4~200mA current environmental protection devices, data line protectors, coaxial cable protectors, telephone protectors, etc. According to the package and internal structure, it can be divided into: axial lead diode, dual in-line TVS array (for multi-line protection), patch type, component type and high-power module type, etc.