SMAJ7.5A

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Transient Voltage Suppression (TVS) diodes are devices specifically designed to protect sensitive electronics from voltage overloads. They are often used in automotive, telecom, and industrial applications in order to protect vulnerable circuits from the potentially damaging effects of transients. The SMAJ7.5A TVS diode is a popular device used in many applications. In this article, we will discuss its application field and working principle.

The SMAJ7.5A is designed to protect voltage sensitive components from transient overvoltages when mounted in parallel with the load. It is an uni-directional device, meaning that it will only allow current to flow in one direction. This allows it to effectively protect circuits from a variety of damaging transient conditions such as electrical noises, high voltages, and spikes in voltage. The device is rated to handle a maximum surge current of 7.5A (8/20μs) with a peak pulse power dissipation of 500 W.

The SMAJ7.5A is typically used in applications that have high common mode transient voltages, such as automotive infotainment systems, industrial machinery, and telecom equipment. In these applications, the TVS is usually placed at the input of the circuit to provide protection against overvoltages from external sources. It can also be used in locations that are prone to EMC susceptibility, such as DC/DC converters and power supplies, in order to reduce the amount of EMI that can enter the system.

The SMAJ7.5A has an operating voltage range of 12-20V and a maximum reverse polarity breakdown voltage (VBR) of 34V. The device has a capacitance of 135pF when in a reverse bias state and is available in an SMA package. It is designed to meet the safety requirements of IEC 61000-4-5, meaning that it is capable of withstanding pulse currents of up to 5A for a period of 20μs.

The working principle of the SMAJ7.5A is fairly straightforward. When a transient voltage is introduced to a circuit, the TVS diode conducts the current away from the circuit and then diverts the current to ground. This neutralizes the transient and prevents it from damaging sensitive components in the circuit. When the transient has passed, the TVS diode automatically resets itself and no longer conducts current away from the circuit, allowing normal operation to resume.

In summary, the SMAJ7.5A is a popular TVS diode that is designed for use in applications that may be prone to voltage transients and surges. It has an operating voltage range of 12-20V and a maximum surge current rating of 7.5A, making it suitable for use in a variety of situations. The device is uni-directional, meaning that it will only conduct current in one direction, providing effective protection against overvoltages and EMI. By following the working principle outlined above, the SMAJ7.5A can help to provide effective protection for sensitive electronics in a wide range of applications.

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