MXLSMBJ78CA Circuit Protection

Voltage - Clamping (Max) @ Ipp:	126V
Supplier Device Package:	SMBJ (DO-214AA)
Package / Case:	DO-214AA, SMB
Mounting Type:	Surface Mount
Operating Temperature:	-65°C ~ 150°C (TJ)
Capacitance @ Frequency:	--
Applications:	General Purpose
Power Line Protection:	No
Power - Peak Pulse:	600W
Current - Peak Pulse (10/1000µs):	4.7A
Series:	Military, MIL-PRF-19500
Voltage - Breakdown (Min):	86.7V
Voltage - Reverse Standoff (Typ):	78V
Bidirectional Channels:	1
Type:	Zener
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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TVS - Diodes

Transient Voltage Suppressors (TVS) like MXLSMBJ78CA are semiconductor devices used to protect against overvoltage caused by electrostatic discharge (ESD), inductive switching, and atmospheric conditions such as lightning strikes. TVS diodes provide an alternative to traditional power supplies, fuses, and surge suppressors.

Applications

TVS diodes like MXLSMBJ78CA are widely used for radio-frequency (RF) and power line protection due to their fast response time and high surge current handling capability. They are ideal for use in low profile, high-voltage applications where space restrictions come into play. They are also being increasingly used in automotive, industrial, aerospace, and consumer applications for overvoltage protection.

Working Principle of MXLSMBJ78CA

The MXLSMBJ78CA is a uni-directional Transient Voltage Suppressor (TVS) diode with an average clamping voltage of 78V that can withstand 2000W of peak pulse power for 1μs. Its operating voltage range is from 6.5V to 32V and the typical junction capacitance is about 1.4pF. The device has two regions: a highly doped region, called an avalanche region, and a less-doped region, called a protective region. When an overvoltage pulse exceeds its breakover voltage, it switches into a conducting mode, which creates a low-resistance path for the current flow and reduces it to a safe level. This process is known as clamping.

Conclusion

TVS diodes are extremely useful devices for providing effective protection against ESD, inductive switching, and other overvoltage conditions. The MXLSMBJ78CA is a uni-directional TVS diode with an average clamping voltage of 78V that can withstand 2000W of peak pulse power for 1μs. With its fast response time and high surge current handling capability, it is ideal for use in low profile, high-voltage applications.

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