SMP12A-M3/85A

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Transient voltage suppressors (TVSs) are devices designed to provide overvoltage protection against electrical transients which might occur on power lines, connections, and other parts of electronic equipment.

SMP12A-M3/85A is one type of TVS dampers. It\'s a unidirectional device, which is specifically designed for the protection of electronic systems from voltage transients generated by lightning and other transient voltage events. It provides high peak pulse power protection of up to 800 W (8/20μs). This particular model is offered in an industry standard SMPD3 package.

SMP12A-M3/85A\'s typical application field include automotive, telecommunication, consumer electronics and industrial applications where transient protection is needed. Most commonly, it is used in Automotive Electronic Control Unit(ECU) and Automotive Telematics, gas tanks, and other sensitive components of automotive electrical systems.

The working principle of SMP12A-M3/85A is quite simple. It contains a Zener diode, a Schottky diode and a FET in one small package. When an overvoltage occurs, the Zener diode begins to conduct, providing the short circuit between the circuit terminal and ground. Along with the FET, this reduces the over-voltage to a safe level, protecting the circuit.

The Schottky diode works in parallel with the Zener diode, allowing it to have a low voltage drop across it. This reduces the power consumption of the device and increases its efficiency. The FET is important as it allows the device to draw a low leakage current, while still providing protection against overvoltage.

SMP12A-M3/85A has a minimum breakdown voltage of 12V. It only works with unidirectional overvoltage protection. The device\'s maximum peak power handling capability is 800 W (8/20μs). It has an operating temperature range of -55°C to +125°C and is rated with a clamping voltage of 20V.

In conclusion, SMP12A-M3/85A is a unidirectional transient voltage suppressor that provides protection against transient overvoltage. Its typical application fields include automotive, telecommunication, consumer electronics and industrial applications. It has a minimum breakdown voltage of 12V, and its maximum peak power handling capability is 800 W (8/20μs).

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