SMF28A-E3-08 Circuit Protection

Current - Peak Pulse (10/1000µs):	4.4A
Base Part Number:	SMF*A
Supplier Device Package:	SMF
Package / Case:	DO-219AB
Mounting Type:	Surface Mount
Operating Temperature:	-65°C ~ 175°C (TJ)
Capacitance @ Frequency:	227pF @ 1MHz
Applications:	General Purpose
Power Line Protection:	No
Power - Peak Pulse:	200W
Series:	--
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
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction to SMF28A-E3-08

The SMF28A-E3-08 TVS (transient voltage suppressor) diode is a general purpose, low capacitance voltage clamp device designed to protect high speed circuits from voltage transients caused by lightning and other electrical transients. This diode is designed to be used with equipment that is powered by low levels of electrical potential and provides a low clamping ratio which ensures a low power dissipation and reliable operation. It is a low-voltage, high-current device with a low clamping voltage and low current leakage. The SMF28A-E3-08 is suitable for use in a variety of automotive, consumer electronics, and industrial systems.

Application Fields for SMF28A-E3-08

The SMF28A-E3-08 is commonly used in automotive assemblies, with applications ranging from protecting vehicle components against transients caused by door slams or vehicle start-ups to providing surge protection of electrical systems. The device also finds applications in consumer electronics, providing protection from unexpected surges or spikes of voltage which can occur in batteries, power supplies, and other consumer devices. SMF28A-E3-08 can be used to protect a variety of systems from voltage transients, as well as to provide high-speed, low-power protection for sensitive RF communication systems. The device is popular in a variety of industrial systems, including those used in power transmission and distribution systems, data processing and communication systems, and instrumentation and automation systems.

Working Principle of SMF28A-E3-08

The SMF28A-E3-08 is a low-capacitance TVS diode which works by clamping transients to a lower and more easily dissipated voltage level. The device is designed such that it does not introduce a significant amount of capacitance or inductance into the circuitry, thus allowing the device to protect the circuit without disrupting its performance. This is achieved through the use of a special diode structure which has an extremely low capacitance-to-voltage ratio.The device works in two main stages; the first stage is when the voltage transient occurs and the diode limits the voltage to a safe level, usually a fraction of its nominal breakdown voltage rating. The second stage follows this, where the current is allowed to flow and the power dissipation of the diode is maximized to dissipate the excess energy and prevent the circuit from exceeding the safe voltage levels. The device will then reset and the device is ready for use again.

Conclusion

The SMF28A-E3-08 is a versatile and reliable device designed for use in a wide range of automotive, consumer electronics, and industrial applications. The diode is designed to provide a low clamping ratio to allow a low power dissipation for reliable operation, while at the same time providing a low capacitance-to-voltage ratio for maximum transient protection. The two-stage working principle of the device ensures that excess energy is dissipated, allowing the device to reset and be ready to use again. The SMF28A-E3-08 is a valuable tool in protecting high-speed circuits from voltage transients caused by lightning and other electrical transients.

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