TP5KP43A Circuit Protection

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A TVS-Diode (Transient Voltage Suppression Diode) is designed to protect sensitive electronic equipment from high voltage transients and overvoltage caused by electrical and magnetic fields from external sources. The TP5KP43A is a fast acting, low capacitance unidirectional TVS Diode designed to protect both data and equipment in a variety of applications.

The TP5KP43A can operate as a normal rectifier diode in the forward and reverse direction, and is a common form of protection in data communication systems and in automotive electronics from electrical transients such as load-dump, build-up and EMC (Electro-Magnetic Compatibility).

This TVS diode works by clamping the voltage across it at a level which is lower than the peak secondary breakdown voltage of the protected circuit. It has extremely low leakage current, and is characterized by a high capacitance of 1.5pF making it suitable for high frequency transient protection. In addition, the device is rated for operating temperatures up to +85°C.

This unidirectional TVS-Diode makes use of a high energy MOV (Metal-Oxide Varistor) and a silicon diode to provide superior protection from large current surges and voltage spikes. The device has an integrated series resistor in a small, low profile package (2.00mm x 1.25mm) with a very fast response time of 5ns. It is designed to provide protection from static electricity and inductive load switching, and its low capacitance helps to reduce interference.

The main applications of the TP5KP43A are in digital signal and data line protection including USB 2.0, CAT5, RS-232, and VGA. This device is also suitable for protecting automotive electronics such as sensors, ECUs and infrared sensing devices, as well as providing protection from ESD, EMI and transient voltages in a variety of industrial applications.

The working principle of the TP5KP43A is based on the principle of breakdown voltage. This occurs when the energy stored in the varistor due to the applied voltage is greater than its breakdown strength. This causes the diode to breakdown and the voltage across the diode to clamp at a level which is lower than the peak secondary breakdown voltage of the protected circuit. This protects the circuit from further voltage increase and maintains the stability of the system.

In summary, the TP5KP43A is a fast acting unidirectional TVS Diode designed to protect sensitive electronic equipment from transient voltages and overvoltages. It offers low leakage current, high capacitance and excellent transient protection in a small packaged device. The device is suitable for a wide range of applications such as digital signal and data line protection, automotive electronics, and ESD, EMI and transient voltage protection in a variety of industrial applications.

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