P4SMA170

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P4SMA170, also known as transient voltage suppressors, is a device which typically utilizes a junction between two semiconductors, such as a silicon diode or a thyristor, to protect the user from dangerous peaks in voltage. The device is used in the application field of surface mount circuits which require protection from transient voltage and it is usually employed within an over-voltage clamping circuit.

The P4SMA170 TVS diode works on the basis of a Zener diode. A Zener diode will always conduct in the reverse direction when the voltage across it differences equal to or greater than the Zener voltage, which is specified in the device’s data sheet. In this way, the Zener diode will clamp any transient over-voltages that it is exposed to.

This device is composed of two diodes connected in opposite directions. This structure forms a series connection, whereby both of the diodes experience the same forward-biasing effect and the same reverse-biasing effect when a voltage is applied. This ensures that the two diodes experience the same voltage level. Another great feature of this device is that it is able to handle higher surge currents than other devices, due to the in-built clamping mechanism.

The working principle of the P4SMA170 TVS diode is based on the fact that it acts like a clamp, absorbing the transient surges of energy when it is exposed to excessive voltages. As the transient energy is absorbed, the device is not damaged or destroyed, since the absorption process takes place without any destructive arc. This device does, however, require a current limiting resistor to be placed before it in circuit, in order to ensure that the current does not exceed the device’s breakdown voltage.

In summary, the P4SMA170 TVS diode is a device which is used mainly in the application field of surface mount circuits, since the device is capable of handling high surge currents. This diode is constructed of two diodes connected in an opposite direction, with the effect that both diodes experience the same voltage level. The working principle of the device is based on the fact that it absorbs transient surges of energy, when it is exposed to excessive voltages, without the destructive arc which is usually seen with other devices. The device does, however, require a current limiting resistor to ensure that the current does not exceed the device’s breakdown voltage.

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