Questions and answers

How do I choose a TVS diode for ESD protection?

How do I choose a TVS diode for ESD protection?

To obtain good ESD protection performance, select a TVS diode with the clamp voltage higher than the line voltage. Select a TVS diode with a guaranteed ESD tolerance level higher than the system’s ESD immunity requirement.

How are TVS diodes rated?

In most diodes, the peak pulse capability will be rated either 8/20µs or 10/1000µs impulse waveform. The actual power dissipation of the transient suppressor component is a key determinant that should be considered when selecting the most suitable circuit protective device for your electronic application.

When would you use a TVS diode?

TVS Diodes are used to protect semiconductor components from high-voltage transients. Their p-n junctions have a larger cross-sectional area than those of a normal diode, allowing them to conduct large currents to ground without sustaining damage.

What is TVS diode working voltage?

Figure 2 – TVS Diode Operation TVS diodes are available in a wide range of operating voltages. Traditional device voltages range from 5V to 440V for discrete devices. Recent innovations in TVS technology have yielded devices, such as Semtech’s SLV series, which operate at 2.8 and 3.3V.

What is the difference between Zener and TVS diode?

2-6(b), a Zener diode clamps input voltage to a constant voltage and supplies clamped voltage to other semiconductor devices. Thus, a TVS diode absorbs surge voltage to protect other semiconductor devices, whereas a Zener diode provides constant voltage to other semiconductor devices.

What is maximum clamping voltage?

Clamping voltage refers to the maximum amount of voltage that can pass a surge protector or electrical breaker before it restricts further voltage from passing to a device or computer. It is a process through which a device or equipment is protected from electrical surges.

How does Zener diode works?

A Zener diode is a silicon semiconductor device that permits current to flow in either a forward or reverse direction. The Zener diode has a well-defined reverse-breakdown voltage, at which it starts conducting current, and continues operating continuously in the reverse-bias mode without getting damaged.

Where should a TVS diode be placed?

Place TVS diode near the edge of the PCB. To enable the excessive surge current to be channeled to chassis ground before damaging the transceiver, the placement of the TVS diode is also important. It is a good practice to place TVS diodes as close to the edge of the board as possible.

Is Zener diode bidirectional?

Features: ・This zener diode absorbs both plus and minus surge in one package, and are suitable for various signal lines fromconsumer appliances to automotives. ・Bi-directional zener diodes.

How does a TVS diode fail?

TVS devices will fail in one of three modes. These are shorts, opens, and degraded devices. In most applications, the preferred method of failure is a short. A short is defined when the TVS device has a resistance value of less than 1 Ω at a DC voltage of 0.1 V (ref.

Is TVS a Zener diode?

One common misconception is that TVS diodes and Zener diodes are the same thing, and I often hear TVS diodes referred to as “Zeners”. TVS diodes and Zener diodes are engineered for very different applications. Zener diodes are designed to regulate voltage and therefore operate in the breakdown region (Figure 2).