What is the difference between Schottky diodes and transient suppression diodes?

Schottky diode is a fast recovery diode, which belongs to a low-power, ultra high speed semiconductor device. Its notable feature is that the reverse recovery time is extremely short (can be as small as a few nanoseconds), and the forward conduction voltage drop is only about 0.4V. Its workmanship is finer and more complex than ordinary diodes, and its price is also higher, but its external performance and functionality are similar to ordinary diodes.

The Schottky transistor is a component in which a Schottky diode is connected in parallel between the base emitter of a transistor (as shown in the figure below). With this Schottky diode, the transistor can prevent over saturation of the base.

Schottky diode circuit symbol

TVS diode: Transient Voltage Suppressor (TVS), abbreviated as TVS, is a high-efficiency protective device in the form of a diode. When the two poles of a TVS diode are subjected to a reverse transient high-energy impact, it can transform the high impedance between its two poles into low impedance at a speed of 10-12 seconds, absorbing surge power of up to several kilowatts, and clamping the voltage between the two poles at a predetermined value, effectively protecting precision components in electronic circuits from damage caused by various surge pulses.

There are three specific characteristics:

1. Adding transient suppression diodes to the signal and power lines can prevent the failure of microprocessors or microcontrollers caused by momentary pulses, such as electrostatic discharge effects, surges in AC power supplies, and noise from switching power supplies.

2. The electrostatic discharge effect can release pulses exceeding 10000V and 60A, and can last for 10ms; However, typical TTL devices will be damaged when exposed to 10V pulses exceeding 30ms. By using TVS diodes, it is possible to effectively absorb pulses that can cause device damage and eliminate interference caused by switches between buses (Crosstalk).
3. Placing the TVS diode between the signal line and ground can prevent unnecessary noise from affecting the data and control bus.