SMF75A Circuit Protection

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Transient Voltage Suppressors (TVS) diodes are the leading type of devices used for protecting sensitive electronic components from transient voltage spikes. The SMF75A type TVS diodes are popular for providing surge protection for automotive power systems such as engine controllers, alternators, and similar devices. They are designed to provide protection against high-energy surges in the range of 4500 W (8/20 μs), making them ideal for applications where other types of protection devices are not suitable.

The SMF75A’s construction consists of a zinc oxide spark gap that directs the energy from the surge into the integrated diode stack. The diode stack consists of 16 avalanche diodes connected in series and each of them is rated for a maximum breakdown voltage of 600 V. When the voltage of the incoming surge exceeds this value, the diodes will start conducting and will divert the energy away from the protected circuitry. The Spark Gap has a very low resistance when a high voltage surge is present, allowing the current to flow more easily through the diode stack.

Since the SMF75A is designed to absorb the energy of a transient surge, its basic working principle is similar to that of other TVS diodes. When a surge is detected, the diode stack is triggered into an avalanche breakdown and begins to conduct current. The diodes then dissipate the energy of the surge as heat, providing the necessary protection for the electronics. The SMF75A is particularly well suited for automotive applications due to its fast response time and its ability to dissipate higher surge energies than most other TVS diodes.

In addition to providing protection against transient surges, the SMF75A also provides an invaluable extra layer of protection against low frequency overvoltages. This is accomplished by the diode stack being connected in a series and the Spark Gap acting as a limitation on the amount of current which can pass through the diode stack. The Spark Gap will first conduct the current and then cut it off at a certain point, offering additional protection against low frequency overvoltages.

The SMF75A is widely used in automotive applications because of its superior surge protection capabilities and its ability to provide protection against both high energy transients and low frequency overvoltages. It is also used to protect other types of electronic devices such as industrial control systems, telecommunications systems, and medical electronics. The SMF75A is a reliable and low-cost solution for providing protection against transient voltage surges and overvoltages.

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