MSMLG78AE3

Voltage - Clamping (Max) @ Ipp:	126V
Supplier Device Package:	SMLG (DO-215AB)
Package / Case:	DO-215AB, SMC Gull Wing
Mounting Type:	Surface Mount
Operating Temperature:	-65°C ~ 150°C (TJ)
Capacitance @ Frequency:	--
Applications:	General Purpose
Power Line Protection:	No
Power - Peak Pulse:	3000W (3kW)
Current - Peak Pulse (10/1000µs):	22.8A
Series:	Military, MIL-PRF-19500
Voltage - Breakdown (Min):	86.7V
Voltage - Reverse Standoff (Typ):	78V
Unidirectional Channels:	1
Type:	Zener
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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TVS - Diodes: MSMLG78AE3 Application Field and Working Principle

TVS (Transient Voltage Suppressor) diodes are a type of protection device used to protect electrical and electronic equipment from transient overvoltage events such as ESD (electrostatic discharge) and lightning. TVS diodes are usually larger than regular diode structures and use materials with higher reverse breakdown voltage. The MSMLG78AE3 is a TVS diode that has a breakdown rating of 78V and a peak pulse power rating of 600W.

Application Field

The MSMLG78AE3 is mainly used to protect sensitive electronics from transient overvoltages caused by switching transients, ESD events and lightning. It is especially well-suited to applications such as automotive, industrial, and solar. It is especially useful in applications where it is necessary to provide high-level transient protection at a very low stand-by current.

Working Principle

When the voltage across the device reaches the breakdown voltage of 78V, it transitions from a low-impedance state to a high-impedance state. This drastic transformation causes the transient energy to be spread over a wider area, resulting in lower voltages across the protected device. The breakdown voltage of 78V ensures that the protected equipment is not subject to voltages higher than the specified rating.When the transient voltage reaches an even higher amplitude, the peak avalanche voltage of the device begins to limit the peak overvoltage. This limits the peak overvoltage to approximately 1.5 times the specified breakdown voltage. The clamping voltage (peak reverse voltage) of the device increases proportionally with the amplitude of the transient overvoltage, ensuring that the protected device is not subject to overvoltages higher than the device limit.The reverse leakage current (Irr) for the device is specified to be no more than 2mA when the peak reverse voltage is 120V. This guarantee of low reverse leakage current ensures that the protected device is not exposed to unwanted current (Irr).

Conclusion

The MSMLG78AE3 is a TVS diode with a breakdown voltage of 78V and a peak pulse power rating of 600W. It is utilized in a wide variety of applications such as automotive, industrial, and solar, and is especially well-suited to applications requiring high-level transient protection at a very low stand-by current. It has a clamping voltage of 1.5 times the breakdown voltage and is designed to limit peak overvoltage. The reverse leakage current is specified to be no more than 2mA, ensuring that the protected device is not exposed to unwanted current.

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