MXSMCJ51AE3 Circuit Protection

Voltage - Clamping (Max) @ Ipp:	82.4V
Supplier Device Package:	DO-214AB (SMCJ)
Package / Case:	DO-214AB, SMC
Mounting Type:	Surface Mount
Operating Temperature:	-65°C ~ 150°C (TJ)
Capacitance @ Frequency:	--
Applications:	General Purpose
Power Line Protection:	No
Power - Peak Pulse:	1500W (1.5kW)
Current - Peak Pulse (10/1000µs):	18.2A
Series:	Military, MIL-PRF-19500
Voltage - Breakdown (Min):	56.7V
Voltage - Reverse Standoff (Typ):	51V
Unidirectional Channels:	1
Type:	Zener
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Introduction

MXSMCJ51AE3 is a transient voltage suppressor (TVS). It is designed to protect sensitive electronics from voltage spikes and over-voltage events. It is used in a variety of devices in many industries. This article describes the application fields and working principle of the MXSMCJ51AE3.

Application fields

The MXSMCJ51AE3 is suitable for a broad range of application fields. It can be used for industrial, automotive, medical and consumer electronic products. It can also be used in electric machinery, data communication equipment, smart phones, automotive electronics, radio-frequency (RF) amplifiers, audio-visual equipment, as well as printers and copiers.

In automotive applications, the MXSMCJ51AE3 is used to protect components from high voltage transients and over-voltages generated by “inductive loads” such as alternators and motors. In industrial applications, it is designed to protect automation, control and data communication systems from over-voltage and transient voltage spikes. In medical and consumer electronics, the MXSMCJ51AE3 is designed to protect sensitive circuitry from voltage transients.

Working Principle

The MXSMCJ51AE3 consists of a Zener diode and an avalanche diode connected in parallel. The Zener and avalanche diodes have different characteristics and are designed for different protection mechanisms.The Zener diode is used for “clamp voltage protection” and can be triggered by over-voltage spikes or transients. When the over-voltage event occurs, the Zener diode acts as a break in the circuit and limits the voltage spike to a set “clamp voltage”.The avalanche diode is used for “crowbar protection” and is designed to protect the circuit from high voltage transients. When a high voltage transient occurs, the avalanche diode will “break down” and shunt the energy away from the sensitive components.

Conclusion

The MXSMCJ51AE3 is a transient voltage suppressor (TVS) designed to protect sensitive electronics from voltage spikes and over-voltage events. It is suitable for a wide range of applications in industrial, automotive, medical and consumer electronics. The MXSMCJ51AE3 consists of a Zener diode and an avalanche diode which provide clamp voltage and crowbar protection.

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