Current - Peak Pulse (10/1000µs):	66A
Supplier Device Package:	SMLJ (DO-214AB)
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:	3000W (3kW)
Series:	Military, MIL-PRF-19500
Voltage - Clamping (Max) @ Ipp:	45.4V
Voltage - Breakdown (Min):	31.1V
Voltage - Reverse Standoff (Typ):	28V
Unidirectional Channels:	1
Type:	Zener
Moisture Sensitivity Level (MSL):	--
Part Status:	Active

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MSMLJ28A/TR Application Field and Working Principle

Introduction

MSMLJ28A/TR is a special three-terminal uni-directional device, also known as Transient Voltage Suppressor (TVS) Diode which is widely used in automotive and telecom applications to protect electronic devices from electrical disturbances caused by lightning strikes. The device works by dissipating the transient high energy pulses, thus avoiding its rotation and destruction of the host electronics and equipment.

Application Field

MSMLJ28A/TR has a broad range of applications because of its superior electrical characteristics. It is mainly used in telecommunications networks to protect components, such as capacitors, transistors, and other components in the circuit from electrical transients such as lightning surge and electrostatic discharge (ESD) generated by nearby storms.

Working Principle

The working principle of MSMLJ28A/TR can be divided into two parts, static and dynamic. In the static mode, the device has a reverse p-n junction diode for overcoming the voltage of reverse bias flow. The concentration of the p-doped part is higher than the n-doped region, and it will provide a voltage drop of around .01V when a small reverse bias is applied. The device is capable of providing peak power of up to 13W (at 8/20 μs pulse width).In the dynamic mode, the MSMLJ28A/TR will absorb and clamp excess voltage to a safe limit, thus providing protection from electrical transients. When a transient voltage exceeds the breakdown voltage of the device, the breakdown voltage will be clamped to the breakdown value and the device will allow the required current to pass through the junction. As the transient voltage then drops below the breakdown voltage, the diode will again become reverse biased and the device will act as an open circuit, allowing any remaining excess energy to be dissipated.

Conclusion

The MSMLJ28A/TR is a highly effective transient voltage suppressor diode, which can be used to protect circuits and electronics from electrical transients such as lightning surge and ESD. It has a wide range of applications due to its superior electrical characteristics, and works by dissipating the excess energy caused by these transients. The device has two modes of operation, static and dynamic, in which it works to either suppress or clamp the input voltage to a safe limit.

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