BZW04-14-E3/73

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TVS - Diodes: BZW04-14-E3/73 application field and working principle

TVS-Diodes, also known as Transient Voltage Suppression Diodes, are devices that protect electronic components against voltage transients such as electrostatic discharges and induced surges. They can be used in multiple application areas, and, depending on the device, can dissipate up to a few hundred watts of power. A notable device of this kind is the BZW04-14-E3/73, which was introduced by STMicroelectronics for commercial use.

Application Field

The BZW04-14-E3/73 is mainly used for mid to low power applications in the consumer, automotive, and industrial markets, and is well-suited for these usage scenarios because it can handle up to 11.8 volts. It also has a reverse breakdown voltage of 14 volts (at 27°C, 5V), and it can dissipate 200W (8/20µs pulses) of power. Furthermore, the BZW04-14-E3/73 features a wide range of operating temperatures, from -55°C to 125°C.

Working Principle

The BZW04-14-E3/73 utilizes quite simple electronics - a pair of two diodes connected in series. This is the most basic type, known as the “diode doubler”, in which the two diodes form a bridge in order to double the voltage. The greater the current flow, the faster the bridge works to form the higher voltage. This means that the diode doubler is capable of providing high voltage protection even at higher pulse widths. Additionally, the BZW04-14-E3/73 incorporates small ceramic capacitance, which provides extra protection against high frequency voltage transients.

In order to provide increased protection against electrostatic discharge (ESD), the BZW04-14-E3/73 also includes an enhanced ESD protection circuit. This ESD protection circuit works by forming a path in series with the main circuit. This path absorbs the ESD energy, thus reducing the stress on the sensitive components. In order to reduce the odds of failure, the device also includes a thermally activated resistor that will activate in the event of an overtemperature event, allowing the device to dissipate the energy.

Conclusion

In conclusion, the BZW04-14-E3/73 from STMicroelectronics is a useful device for mid to low power applications. It is designed to provide protection against voltage transients such as electrostatic discharges and induced surges. The device is also capable of handling a wide range of operating temperatures, from -55°C to 125°C, and can dissipate up to 200 watts of power.

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