3KP17C-B

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TVS - Diodes

The application field and working principle of the 3KP17C-B Transient Voltage Suppressor (TVS) diode is a useful tool to be familiar with for a wide range of applications. Specifically, the 3KP17C-B is designed to provide over-voltage protection for power supplies and other electrical components from detrimental electrical surges and power-sag events. To understand how this component works, it is important to look at its overall structure and various features.

Structure

This diode consists of PN junction made of silicon semiconductor materials, but it is an asymmetrical type that includes two rectifying junctions connected in between its terminals. The two rectifying junctions are connected in reverse-series on the same current path, forming a PNPN structure. It also features a special mount structure that allows it to be used with an axial-leaded two-pin electrical socket.

Functional Properties

The working principle of the 3KP17C-B is based on capacitive coupling. In case of an over-voltage, the electric charges in the external circuit are induced across the junction and the stored capacitance of the diode acts as a capacitive coupling device. This suppresses the surge voltage and provides clamping protection. The transient response time of the device is usually less than 1 nanosecond and the clamping voltage is normally around 6 volts.

Limitations

The 3KP17C-B TVS diode does have some limitations, however. It is not suitable for use as a permanent protective device as the device\'s capacitance is sensitive to temperature and other environmental factors. The device is also not suitable for use as an on-off switch due to its PNPN structure, which can cause failures at relatively high voltages.

Applications

Despite these limitations, the 3KP17C-B still has a wide range of applications in home, commercial, industrial and automotive electrical systems. In commercial and industrial settings, this device can be used to protect against lightning-induced overvoltages, power-sag events and other transient over-voltages. It can also be used in automotive electronic systems for protection against electrostatic discharges, voltage spikes, and transients. In the design of such systems, the 3KP17C-B should be chosen with careful consideration of the environment and the transient characteristics of the system.

Conclusion

The 3KP17C-B Transient Voltage Suppressor (TVS) diode is an asymmetrical PNPN structure designed to provide over-voltage protection in a wide range of applications. It is based on a capacitive coupling principle and is generally limited to a transient response time of less than 1 nanosecond and a clamping voltage of between 6 and 7 volts. Despite its limitations, the device has a wide range of applications in home, commercial, industrial, and automotive systems, where it can provide protection against lightning, over-voltages, electrostatic discharges, and transients.

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