BZW04-376B-E3/54 Circuit Protection

Current - Peak Pulse (10/1000µs):	670mA
Base Part Number:	BZW04
Supplier Device Package:	DO-204AL (DO-41)
Package / Case:	DO-204AL, DO-41, Axial
Mounting Type:	Through Hole
Operating Temperature:	-55°C ~ 175°C (TJ)
Capacitance @ Frequency:	--
Applications:	General Purpose
Power Line Protection:	No
Power - Peak Pulse:	400W
Series:	TransZorb®
Voltage - Clamping (Max) @ Ipp:	603V
Voltage - Breakdown (Min):	418V
Voltage - Reverse Standoff (Typ):	376V
Bidirectional Channels:	1
Type:	Zener
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction

TVS - Diodes are transilient voltage suppressors (TVS) that protect sensitive electrical circuits against temporary voltage spikes or inductive loading. BZW04-376B-E3/54 is a common type of TVS Diode that is designed to provide protection from short duration transients while operating over a wide frequency range from DC to 8.5 GHz. In this article, we will discuss the application field and working principle of BZW04-376B-E3/54 TVS Diode.

Application Field

BZW04-376B-E3/54 TVS Diode is mainly used in audio, video, direct link cable, USB, SCSI, and many other circuits which require fast response and high frequency protection from transient voltages. It provides protection from transient voltages up to 250V peak. It also has a low leakage current which ensures that there is no unnecessary degradation of multiple input signal lines or output. As this TVS Diode is designed to provide protection from short duration transients, it is suitable for high frequency as well as low frequency applications.

The BZW04-376B-E3/54 TVS Diode is also used in automotive, medical, and telecommunications applications as it can successfully protect the circuits from transient voltages by disposing off this energy. This TVS Diode is also used in the automotive sector due to its ability to provide protection from electrical disturbances like over-voltage, inductive loading, and electrostatic discharge.

Working Principle

The BZW04-376B-E3/54 TVS Diode is a combination of a Zener Diode and a Transistor. It works on the principle of clamping. It functions as a short circuit from ground to the supply voltage when the voltage across its terminals increases beyond a certain level. This clamping action will ensure that the transient voltage spike dissipates its energy harmlessly into the ground. The working voltage of this TVS Diode is between 5 and 24 V and can handle transient peaks up to 250V.

The BZW04-376B-E3/54 TVS Diode consists of two internal Zener Diodes connected in reverse series with each other, connected to the output of a NPN transistor. This transistor is configured in the common-emitter configuration which allows the transistor to control the flow of current and voltage. When the load voltage exceeds the working voltage of the TVS Diode, the transistor will switch on and start conducting current. This current will then discharge into the ground, thus limiting the output to the working voltage.

The BZW04-376B-E3/54 TVS Diode also has an ESD protection feature. The ESD protection feature prevents electrostatic discharge energy from affecting the circuit. This is achieved by using a capacitance between the source and the drain of the transistor. This capacitance stores any static charge which helps in providing protection against potential ESD.

Conclusion

BZW04-376B-E3/54 TVS Diode is a combination of a Zener Diode and a Transistor which works on the principle of clamping. It is mainly used in audio, video, direct link cable, USB, SCSI, and many other circuits which require fast response and high frequency protection from transient voltages. It also has an ESD protection feature which helps in providing protection against potential ESD. In this article, we discussed the application field and working principle of BZW04-376B-E3/54 TVS Diode.

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