How to use devices with low antistatic ability
For users of devices, devices with high antistatic capability are always more popular than devices with low antistatic capability. However, with the development of VLSI, a scale-down design has been adopted to achieve small size, light weight, low power consumption, high integration, and high performance, high reliability, low input, and high output. The advantages of fast turnover and other aspects. A series of micro-machining technologies such as shallow junctions and thin oxide layers are commonly used in the manufacturing process, and the antistatic ability of the devices is getting worse.
The antistatic capability of the device varies with the design and manufacturing process of the device. For example, CMOS, compared with PMOS and NMOS devices, although the antistatic ability is in the same order of magnitude, CMOS devices have a slightly higher antistatic capability than PMOS and NMOS devices by several hundred volts.
The user's request for a device with high antistatic capability is, to a certain extent, not realistic. First, devices with high antistatic capability are more complicated in design and manufacturing process, and the cost is higher. Second, devices with high antistatic capability are expensive and the cost of the whole machine increases.
In view of the above situation, it is recommended to add a transient voltage suppression circuit (TVS) for lightning protection, overvoltage prevention, antistatic and anti-interference at the input/output terminals of sensitive devices with low antistatic capability when designing the whole machine. Can effectively improve the antistatic ability of the whole machine. Transient voltage suppression circuits have been widely used in other high-tech fields such as communications, computers, I/O ports, and signal input/output protection.
Transient Voltage Suppression Circuitry (TVS) is a high performance protection device. When the transient voltage protection diode is subjected to a reverse transient high energy impact, it turns the high impedance between its two poles into a low impedance at a speed of the order of 1 x 10-12 s. Absorbing surge power of up to several kilowatts, the voltage between the two poles is clamped to a predetermined value, effectively protecting the sensitive components of the electronic circuit from various surge pulses. The device has the advantages of fast response time, large transient power, low leakage current, easy control of clamping voltage, no damage limit, small volume, etc., and has been widely used in various fields.