1KSMB47CAHM4G

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TVS diodes are some of the latest developments in circuit protection technology. The 1KSMB47CAHM4G model of Transil, part of the VISHAY Semiconductor brand, is one such device. It provides impressive levels of fast transient over-voltage protection (TVS) for customer applications in a tiny package. This article will take a look at the features and applications of this excellent device, as well as exploring its working principle.

Features and Applications

The 1KSMB47CAHM4G device from VISHAY Semiconductor is a unidirectional Transil+ TVS nominally rated at 600 W. This peak power (also known as surge pulse power), allows the 1KSMB47CAHM4G to comfortably protect against peaks of over-voltages, generally in the range of 2,500V to 2,700V. One of the main features of this device is its compact package, measuring just 2.5mm x 2.5mm, making it ideal for applications where space is a premium. In addition, its low stand-off voltage of 7V and low clamping voltage of 18V make it hugely versatile.

The main applications for the 1KSMB47CAHM4G TVS devices are in systems which require protection from electrostatic discharge (ESD), electrical overstress (EOS) and lightning surges. The device is specifically suited for data lines in portable electronics, and is also ideal for telecom, industrial, automotive and consumer applications. It is also widely used in USB 2.0 ports.

Working Principle

The 1KSMB47CAHM4G Transil device features a breakdown voltage which is usually higher than the maximum output voltage of the over-voltage source. This device types works by allowing the excess voltage to flow onto its electrodes, and releasing the energy in the form of a current spike. This energy is dissipated through the device itself, meaning the excess voltage is not passed on to any other components in the device. Using this mechanism, the device protects against overvoltages caused by ESD, EOS and lightning.

The 1KSMB47CAHM4G model also features an anti-latch up mechanism, meaning the device remains in a non-conducting state even after the transient events have exceeded its protection capability. This prevents any further current flowing through the device once it has been triggered, so the TVS device can be reset after the event and reused.

Final Thoughts

The 1KSMB47CAHM4G Transil+ TVS is a great example of the innovative technology VISHAY Semiconductor is capable of providing. Its high levels of fast transient over-voltage protection make it the ideal choice for protecting against surges from ESD, EOS and lightning, along with other applications in telecom, industrial, automotive and consumer applications. Its tiny package and versatile operating voltage range make it perfect for applications where space is at a premium.

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