3KP28

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TVS (transient voltage suppressors) diodes are used to protect electronic circuits or electronic systems against surge voltages and overshoot transients. The 3KP28 is a TVS diode specifically designed for use in automobile applications, protecting vehicle systems from transients caused by ignition noise and switching loads. It offers low capacitance and low clamping voltage, making it ideal for automotive applications such as radio and navigation systems.

The 3KP28 consists of a reverse Avalanche valley or lightly-doped Zener diode, two parasitic PN junctions, and a Zener diode for current control. The integrated Zener diode circuitry provides a fast response time with low capacitance. This diode is designed to absorb surges up to 800W dissipating up to an 8V effective clamping voltage.

The 3KP28 is designed for use in a variety of automotive electrical systems such as engine control units, dashboards, radios, navigation systems, and other modules. It is capable of protecting sensitive circuits from noises coming from inductive loads like switching motors, electric road signals, and inverters. It is also designed to protect against voltage transients caused by lightning, load dumping, brake lights, and other electrical loads.

The working principle of the 3KP28 is quite simple. When a voltage transient exceeds the diode\'s breakdown voltage, the Avalanche valley or lightly-doped Zener diode becomes highly conductive, allowing a large current to flow through the diode. This current then is divided through the two parasitic PN junctions and the diode\'s Zener diode, which clamps the overall transient to the specified voltage. The current then is discharged from the diode, and the transient voltage is attenuated.

In summary, the 3KP28 is a TVS diode specifically designed for use in automotive applications, providing protection for sensitive circuits against transients such as load dumping, voltage transients, and lightning. Its fast response time and low capacitance make it ideal for automotive systems. It consists of a reverse Avalanche valley or lightly-doped Zener diode, two parasitic PN junctions, and a Zener diode for current control. When a voltage transient exceeds the diode\'s breakdown voltage, the diode will conduct a large current, which is then divided through the two parasitic PN junctions and the diode\'s Zener diode, clamping the transient to the specified voltage. The current then is discharged from the diode, and the transient voltage is attenuated.

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