MSMBJ20A

Voltage - Clamping (Max) @ Ipp:	32.4V
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):	18.5A
Series:	Military, MIL-PRF-19500
Voltage - Breakdown (Min):	22.2V
Voltage - Reverse Standoff (Typ):	20V
Unidirectional Channels:	1
Type:	Zener
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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IntroductionMSMBJ20A is a type of Transient Voltage Suppressor (TVS) diode, which is widely used to provide protection from voltage transients. This type of diode is designed to provide over-voltage protection in various types of electronic and electrical circuits and systems. It is an unidirectional diode with a low breakdown voltage and low leakage current. This makes it an ideal choice for applications requiring over-voltage protection, and makes it highly suitable for transient protection tasks.Applications of MSMBJ20AThe MSMBJ20A is commonly used in a variety of electronic and electrical circuits, including those used in telecommunications, automotive, computer, and consumer electronics. It is used for over-voltage protection in circuits where transient voltage spikes could cause malfunction or damage. Some of the specific applications of MSMBJ20A include:• Protection of data lines and power supply lines from over-voltage transients• Protection of automotive MCUs, displays, and other sensors from electrostatic discharge (ESD) and power surges• Protection of CRT displays, telephone systems, and digital cameras from voltage transients• Protection of battery and switching power supplies from over-voltage transientsWorking Principle of MSMBJ20AThe MSMBJ20A is designed to protect against voltage transients. It is capable of conducting current in either direction and is designed to clamp the voltage to a certain level when it exceeds this voltage. This clamping action isolates the protected circuit from destruction. The breakdown voltage of a TVS diode is an important parameter that determines the protection level of the device. Generally, the lower the breakdown voltage, the more effective is its capability to protect against transients.The operation of a MSMBJ20A is based on avalanche breakdown. When the diode is subjected to a voltage higher than its breakdown voltage, the electric field becomes so strong that the electrons in the depletion region are accelerated to large enough energies to cause avalanche breakdown. This creates a large number of electron-hole pairs, which create an exponential increase in the current flowing through the diode. This current creates a voltage drop, which clamps the voltage at the breakdown voltage of the diode.ConclusionThe MSMBJ20A is a type of unidirectional TVS diode commonly used for over-voltage protection in various types of electronic and electrical circuits and systems. It has a low breakdown voltage and low leakage current, which makes it a suitable choice for transient protection tasks. The operation of the MSMBJ20A is based on avalanche breakdown, wherein a voltage drop is created to clamp the voltage at the breakdown voltage of the diode when it is subjected to a voltage higher than this breakdown voltage.

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