BZW04-94BHA0G

TVS - Diodes

TVS diodes, also known as transient voltage suppressors, are special purpose diodes designed to protect circuitry and components from voltage transients or high-energy surge events. These transient events could include lightning strikes, power surges, and electrostatic discharge, and can damage circuit components, reduce performance, and even cause data loss. While Surge Protective Devices (SPDs) are often the preferred choice for surge protection, TVS diodes are more common, smaller, and less expensive, which makes them the ideal choice for surge protection of vulnerable low-cost consumer electronics such as audio/video components, PCs, and other home appliances.

BZW04-94BHA0G Application Fields and Working Principle

The BZW04-94BHA0G is a low breakover voltage point, high power rating, low clamping voltage, and low reverse current transient voltage suppressor designed for use in automotive applications. It is a single diode voltage suppressor, designed to provide both ESD and surge protection for electronic systems. The device provides ESD protection for IEC-61000-4-2 level 4 & 5 standards and surge protection for vehicles with 24V power line.

The BZW04-94BHA0G is a specifically designed TVS diode which utilizes a Zener diode and an avalanche diode for ESD protection and is able to provide sufficient protection against surges up to several hundreds of volts. A Zener diode acts as a ‘doorknob’ to clamp the voltage at the maximum specified voltage, while the avalanche diode ensures that the system will not experience an overshoot by ensuring that only a controlled amount of electrical current flows.

The device can be connected in either direction without negatively impacting device performance. When a transient voltage surge is detected, the device functions by actively diverting the energy from the surge away from the system, thus protecting it from damage. The diode can also absorb the current induced by ESD, allowing the voltage to be clamped to safe levels, protects the system from resetting, and prevents component or data loss.

The device has been tested to meet industry standards, and is also able to provide protection from reverse-flow current, which is an important issue in automotive applications, where systems are regularly exposed to high levels of vibration. The device is RoHS compliant and is approved and available through major automotive component suppliers.