Voltage - Clamping (Max) @ Ipp:	45.4V
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):	13.2A
Series:	Military, MIL-PRF-19500
Voltage - Breakdown (Min):	31.1V
Voltage - Reverse Standoff (Typ):	28V
Unidirectional Channels:	1
Type:	Zener
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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What is MASMBJ28A TVS Diode and How it Works?

A transient voltage suppressor (TVS) diode, such as the MASMBJ28A, is a relatively new electronic device that safeguards vulnerable electronics from damaging voltage surges. They are the most effective and reliable means of protecting sensitive electronic components from damage by sudden surges, spikes, and power transients. By utilizing the principle of avalanche breakdown, a TVS diode prevents electrical noise, voltage transients, and transient current from affecting the sensitive electronics with which it is connected. In this article, let us learn more details about MASMBJ28A TVS diode, its application fields, and working principle.

What Is a TVS Diode?

A TVS diode is an over-voltage protection device designed to protect electronic components from voltage transients/spikes and noise which could damage sensitive electronic systems. It is constructed of a semiconductor material (usually silicon) and its operation is based on the principle of avalanche breakdown. When a voltage higher than the threshold voltage of the device is applied across the TVS diode, a high current surge causes the avalanche breakdown of the diode material. This breakdown occurs at a very low voltage, resulting in a dramatic increase in current through the diode. The high current effectively lowers the input voltage to a safe level by dissipating the excess energy as heat.

Application Field of MASMBJ28A

The MASMBJ28A is an ultra-fast, high-efficiency, unidirectional TVS diode designed to protect electronic circuits against destructive voltage transients. It is rated at 28 volts with a working current of 600mA and a peak pulse power rating of 1500W. This makes it ideal for a multitude of applications, such as protecting USB ports, telephone lines, and automotive circuits. In automotive circuits, for example, the MASMBJ28A is used to protect against the sudden, uncontrolled currents which are caused by engine ignition or alternator noise. It is also effective against electrostatic discharge (ESD) which can occur when materials with dissimilar electrical charges come into contact with each other. The MASMBJ28A is also suitable for protecting the data and signal lines on embedded and communication systems. It can provide protection against static electricity, lightning, and other sources of electrical over-voltage, while also reducing the likelihood of EMI (electromagnetic interference) affecting any nearby electronic microscopes, probes, or other sensitive sensing devices.

Working Principle of MASMBJ28A

The working principle of the MASMBJ28A is quite simple: it works by utilizing the principle of avalanche breakdown. When a voltage higher than the device\'s rated breakdown voltage, also known as the clamping voltage (VC), is applied, the diode undergoes the process of avalanche breakdown.During this breakdown, the electrons and holes in the silicon material gain enough energy so that they can move (or flow) freely, which in turn creates an increased number of collisional events. This phenomenon is known as avalanche multiplication, and it eventually results in a high current surge. By dissipating the excess energy as heat, the diode is able to effectively lower the input voltage to a safe level.Overall, the MASMBJ28A is an effective and robust device for providing protection against voltage transients, spikes, and power transients. Its application field covers automotive circuits, USB ports, telephone lines, and embedded/communication systems, and its avalanche breakdown principle ensures reliable performance with every usage.

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