P4SMA18CAHE3/5A Circuit Protection

P4SMA18CAHE3/5A is a unidirectional High-Speed SMB-type TVS-Diode from NXP.

TVS (Transient Voltage Suppressor) Diodes are designed to protect electronic circuits from destructive voltage transients caused by electrostatic discharge (ESD). This protection is provided by allowing a surge current to be absorbed safely into a low impedance path while providing a high degree of isolation from the source of the surge. The SMB-type is an overvoltage protector for a variety of applications. It offers bi-directional symmetrical protection, easy voltage, and multiple wattage options to fulfill wide range of protection needs.

The P4SMA18CAHE3/5A is a very reliable and versatile unidirectional High-Speed SMB-type TVS-Diode which provides protection against ESD and transients. It has a peak pulse power of 10.6W (5/1000µs) and is offered in both 3.3V and 5V versions. It has a very low clamping voltage which makes it ideal for applications with a low voltage supply.

The P4SMA18CAHE3/5A has a fast response time due to the high surge current capability (14A 8/20µs) and its low clamping voltage. It also offers bi-directional symmetrical protection from 8V to 36V. This makes it suitable for a wide range of applications such as automotive, telecommunications, and consumer electronics.

The working principle behind the P4SMA18CAHE3/5A is a combination of its zener diode and negative temperature coefficient thermistor (NTC) functions. The zener diode will clamp the applied voltage when it exceeds the breakdown voltage. The NTC thermistor helps to reduce the energy of an ESD event by acting as a resistor in series with a device under stress. The thermistors also limit inrush current which help to protect the circuit against overcurrent and overvoltage.

The P4SMA18CAHE3/5A is suitable for a wide range of applications, such as telecommunications, consumer electronics, Automotive, and Medical devices. It is often used in places where overvoltage protection of circuits is a must, especially places where two different power systems exist in one device. The device can be used wherever there is possibility of ESD, EFT or power surges. It does not require any external components and has a very fast response time which makes it an ideal solution for protecting electronics devices from overvoltage transients.

In conclusion, the P4SMA18CAHE3/5A is a very reliable and versatile unidirectional High-Speed SMB-type TVS-Diode from NXP. It has a very low clamping voltage and fast response time, as well as bi-directional symmetrical protection from 8V to 36V making it suitable for a wide range of applications. The device’s working principle is based on a combination of zener diode and NTC thermistor functions which helps to reduce the energy of an ESD event and limit inrush current.