MPLAD18KP78AE3 Circuit Protection

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TVS diode, with a full name of transient voltage suppressors, is used to protect sensitive electronic devices from high voltage transient. It is common to find this type of device in laptops, cellular phones, power supplies, and even cars, providing vital surge protection for automobiles. The MPLAD18KP78AE3 is one of many TVS diode products on the market, and offer a variety of features and benefits that make it attractive to a range of applications.

Application Field

The MPLAD18KP78AE3 is a low capacitance surface-mount diode developed by NXP/Freescale for automotive applications. This versatile TVS diode provides 8A peak pulse power protection and 19.1V reverse standoff voltage. It also features low leakage current for 8V operating voltage. Its stable performance over a wide temperature range from -40C to 125C makes the MPLAD18KP78AE3 suitable for a variety of automotive applications, such as Automotive infotainment, millimeter wave radar, radar brakes, power supply, bootstrap, etc.

The MPLAD18KP78AE3 is also a great choice for general industrial applications, such as medical cordless equipment, wearable device, battery-powered products, power converters and motor control, and datacom systems. In all these applications, the low capacitance surface-mount diode is designed to provide reliable pulse power protection. As such, it can protect sensitive electronic components and circuits from damage due to transient over-voltages.

Working Principle

The working principle of the MPLAD18KP78AE3 is based on the avalanche breakdown phenomenon. As the voltage gets higher than the breakdown voltage, free electrons in the junction create an avalanche of electrons that generate hole-electron pairs. These hole-electron pairs, or carriers, then carry current through the junction. This process acts as a fast short-circuit, thus preventing the voltage across the diode to rise above its breakdown voltage.

However, high energy transient can cause power dissipation of the TVS diode. To reduce power dissipation and extend the lifetime of the diode, the MPLAD18KP78AE3 is designed with a thermal shutdown protection circuit. This feature protects the diode from exceeding its specified power dissipation, thus ensuring maximum reliability and quality.

The MPLAD18KP78AE3 also features a fast response time and a low clamping voltage, which is designed to limit the amount of energy getting to the load. The diode also features reverse capacitance that provides impedance in the opposite direction to the signal source. This improves the system transmission line returns and thus reduces EMI/RFI.

The MPLAD18KP78AE3 is an ideal choice for applications requiring improved surge protection. Its low capacitance, fast response time, and reverse capacitance ensure reliable and robust peak power protection. The thermal shutdown protection circuit helps to reduce power dissipation and extend its lifetime. With its versatile design, the MPLAD18KP78AE3 is suitable for a variety of applications, ranging from automotive to general industrial.

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