MSMCJ85A

Voltage - Clamping (Max) @ Ipp:	137V
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):	10.4A
Series:	Military, MIL-PRF-19500
Voltage - Breakdown (Min):	94.4V
Voltage - Reverse Standoff (Typ):	85V
Unidirectional Channels:	1
Type:	Zener
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Transient Voltage Suppressors - Diodes (TVS-Diodes)

The MSMCJ85A is a power semiconductor device belonging to the transient voltage suppressor (TVS-Diode) family. These devices are designed to protect electrical and electronic devices from transient high-voltage surges, spikes, surges and other negative voltage events. TVS-Diodes are used to prevent accidental or intentional over-voltage events from damaging sensitive electrical components.

MSMCJ85A Application Field

The MSMCJ85A TVS-Diode is designed primarily for use in low-signal audio/video applications and the voltage protection circuits of consumer electronic equipment. Its low on-state resistance makes it an excellent choice to deliver protection from surges, spikes, lightning transients and other transient electrical events. It is also suitable for protection from electrostatic discharge (ESD).

MSMCJ85A Working Principle

In its basic form, a TVS-Diode acts as a voltage dependent switch. When the voltage across it exceeds its breakdown voltage, it rapidly goes from a non-conductive state to an energized, conductive state. This is caused by an avalanche breakdown process, which disrupts the electric field across the diode junction. The avalanche breakdown process causes the voltage to drop dramatically, essentially allowing a controlled surge of current to pass though the diode, which then effectively clamps the voltage at a safe level. Once the surge is gone, the diode automatically returns to a non-conducting state.In the case of the MSMCJ85A, it is designed to absorb currents up to 5,400 Amperes (8/20 microsecond waveform). Its peak power rating (P PPM ) is 525 Volts, 10 Watts, and it is capable of dissipating up to 7.5 Watts of continuous power. It is rated for very low capacitance and may be used in high-frequency applications.

Conclusion

In this article we have discussed the MSMCJ85A TVS-Diode, its application field and working principle. We hope this information has been useful in helping explain how TVS-Diodes are used to protect sensitive electrical and electronic components from transient events, such as surges, spikes, lightning transients and other electrical events. TVS-Diodes are becoming increasingly popular in the audio/video and consumer electronic markets, as they provide a reliable and cost-effective means of voltage protection for a wide range of applications.

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