SMF28A-TP Circuit Protection

Voltage - Clamping (Max) @ Ipp:	45.4V
Supplier Device Package:	SOD-123FL
Package / Case:	SOD-123F
Mounting Type:	Surface Mount
Operating Temperature:	-65°C ~ 175°C (TA)
Capacitance @ Frequency:	--
Applications:	General Purpose
Power Line Protection:	No
Power - Peak Pulse:	200W
Current - Peak Pulse (10/1000µs):	4.4A
Series:	--
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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TVS diodes, also known as transient voltage suppressors, are electronic components used to protect sensitive circuit elements from damage caused by high voltage transients such as electrostatic discharge. The SMF28A-TP is a device from Vishay Semiconductors in the TVS diode family.The SMF28A-TP consists of two back-to-back avalanche support diodes with a thermal disconnect switch. The combination of these two systems allows the device to provide excellent EOS and ESD protection for applications in the avionics, automotive, and nuclear industries. The device also features a low-capacitance diode which minimizes signal distortion and allows for increased switching speeds when operated in applications with high-frequency signals.The SMF28A-TP can operate at temperatures between -55°C and 150°C and has a maximum surge current of 3300A (8/20 μs). In addition to protecting against electrostatic discharge, the device can also be used to protect against lightning-induced surges, power line transients, and heavy inductive loads. The device is offered in an SOD-123FL package and is rated for a forward voltage of 1.2V.In terms of applications, the SMF28A-TP is a suitable choice for EOS and ESD protection in a variety of environments, particularly avionics, automotive, and nuclear. Furthermore, the device is suitable for use in automotive powertrains, automotive engine control units, automotive body electronics, avionics systems, and nuclear reactors. The working principle of the SMF28A-TP lies in the combination of a fast-acting avalanche support diode and a thermally disconnect switch. The avalanche support diode works by reducing the overvoltage until it reaches a safe level. When a negative or positive spike occurs, the diode switches on and conducts the additional current, suppressing the surge and protecting the circuit elements from damage. Meanwhile, the thermal disconnect switch acts to reduce the operating temperature of the device within the specified range, ensuring reliable and safe operation. In conclusion, the SMF28A-TP is a valuable device for EOS and ESD protection in a wide variety of hazardous environments. Its combination of a fast-acting avalanche support diode and a thermal disconnect switch makes it an excellent choice for automotive, avionics, and nuclear applications. Furthermore, its low-capacitance diode also allows it to be used in applications with high-frequency signals without sacrificing performance.

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