SMF8.0A

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TVS diodes are the most common type of protection devices in use today, offering excellent electrical protection against transient surge events. The SMF8.0A, released by IXYS Corporation, is an excellent example of a transient voltage suppression (TVS) device with a wide range of applications. This article will discuss the application field and working principle of the device.

The SMF8.0A is widely used as a protection device against transient surge events in automotive and industrial applications. Specifically, the device is used to protect automotive ECUs, industrial motors, and even electronic equipment in confined areas. The SMF8.0A includes an integrated over voltage protection (OVP) circuit, which is designed to protect the circuit from overvoltage events. This OVP circuit is designed to protect against the high voltage usually associated with the power line or battery charging. The OVP circuit also provides protection against short circuit and reverse polarity, so the device is ideal for use in a wide range of environments.

Moreover, the SMF8.0A is designed to work on both unipolar and bipolar supplies, allowing it to be used in a wide range of applications. The device includes a hi-idle state, which provides protection against over voltage during low power consumption scenarios. In addition, the SMF8.0A has an integrated transient reduction circuit, which helps to reduce the peak voltage of fast-rise time transients, thus providing superior protection against electrical stress.

The SMF8.0A is extremely reliable and cost-effective, making it a popular choice among engineers and designers. The device has an leakage current of less than 1.5 mAp-p at working voltages between 6 and 27V, providing reliable protection against over voltage events. Moreover, the device has a maximum surge current rating of 6.5A (8/20 μs surge), making it a great protection device for high-current applications. Additionally, the SMF8.0A has an adjustable peak voltage protection (AVP) feature, which allows the engineer to select the desired peak protection level.

In terms of the working principle, the SMF8.0A utilizes a low forward voltage of 1.25V typically, in order to provide reliable transient protection. The device is designed with two back to back Zener diodes connected in series, so when an over voltage event occurs, the device clamps the voltage to the peak level specified by the user. When a surge voltage is applied, the Zener diodes break down and divert the energy away from the protected device, thus preventing damage. At the same time, the low forward drop voltage of the device ensures that the low current flows, allowing the protected circuit to operate normally.

In conclusion, the SMF8.0A is an excellent example of a TVS device with a wide variety of applications. The integrated OVP and AVP circuits, hi-idle state, and low forward voltage of the device provide superior protection against transient surge events, making it a great choice for a range of applications. The device is also highly reliable and cost-effective, making it a popular choice among engineers and designers alike.

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