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TVS-Diodes Introduction

TVS - Diodes are a type of electronic component that works as an active protection for over-voltage transients. They work by clamping the voltage at a specified level when a specific threshold is crossed. When high-voltages (e.g. electrical surges) cause the voltage at the input of the diode to exceed the breakdown voltage of the diode, the diode will quickly and automatically short the supply and reduce or eliminate the voltage spike. This protects the device and wiring from potential damage.

BZW04-70BHA0G Application Field and Working Principles

The BZW04-70BHA0G is a Si-driven, unidirectional transient voltage suppressor(TVS) specially designed for protecting against ESD, EFT, and lightning. It is used in automotive, industrial, medical, and consumer applications. It offers an integrated power protection solution and excellent performance in a variety of applications.

The BZW04-70BHA0G operates as an ESD protection diode when the input voltage rises above the breakdown voltage. During the breakdown of the BZW04-70BHA0G, the diode quickly reduces the voltage to a safe limit. The BZW04-70BHA0G offers superior ESD performance, with an IEC 61000-4-2 Level 4 (±20 kV contact discharge capability) rating. Additionally, the diode also offers an EFT protection rating of IEC 61000-4-4 (up to 4 kV).

The working of BZW04-70BHA0G can be explained as follows. It consists of a junction diode, a voltage-controlled resistor, and an array of capacitors. When the input voltage exceeds the breakdown voltage of the diode, the voltage-controlled resistor reduces the voltage by limiting the current flow. The capacitors act as filters, smoothing the voltage fluctuations. The diode also has a reverse polarity protection, which ensures that the TVS will not be damaged if it is connected with the wrong polarity.

Benefits and Limitations of BZW04-70BHA0G

The BZW04-70BHA0G offers a complete ESD protection solution with excellent performance. It is available in a small package size and features a low parasitic inductance, high surge current tolerance, and low capacitance. This makes it suitable for high-speed applications such as 10/100BASE-T Ethernet, HDMI, and LVDS. Additionally, it has a low clamping voltage, which helps protect sensitive devices. The BZW04-70BHA0G is also RoHS compliant and UL listed.

The limitation of the BZW04-70BHA0G is its limited EFT and clamping current capability. Its clamping current is limited to 5 A and its EFT rating is only 4 kV. Additionally, its clamping voltage varies with temperature and current, thus potentially causing erroneous protection in some cases.

Conclusion

The BZW04-70BHA0G is a Si-driven, unidirectional transient voltage suppressor (TVS) specially designed for protecting against ESD, EFT, and lightning. It offers an integrated power protection solution and excellent performance in a variety of applications. The device features a low parasitic inductance, a low clamping voltage, and a low capacitance, making it suitable for high-speed applications. However, it has a limited clamping current and EFT rating, as well as a variable clamping voltage with temperature and current.

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