SMBJ12A-QH

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

TVS - Diodes have found various applications for protecting systems and devices against electrical transients. In this context, SMBJ12A-QH, a bi-directional device from ON Semiconductor, is one of the most popular component in this family. This article will discuss about the application fields and working principles of the device in detail.

Mostly used in important protection and safety systems, SMBJ12A-QH is a Transient Voltage Suppression (TVS) diode designed in a bidirectional, low-capacitance diode bridge configuration. It comes with an under-surface mount package having a high surge capability of up to 12A. The device is ideal for protecting I/O lines, power rails, and other digital equipment from damaging voltage transients. It is rated for an operating voltage of 8V with a maximum clamping voltage of 44V.

The device is mainly used in consumer electronic devices such as laptops, tablet PCs, cellular phones, data cards, modems, digital cameras, solid state drives, and the protective circuits for computer boards. It also finds use in automotive electronics such as seat belt control, navigation systems, ABS brake systems, engine control modules, and air-conditioning controllers.

The device is composed of a pair of Zener diodes connected in a bridge configuration, which is designed to provide protection against a wide range of ESD, EMI, and EFT transients. The Zener breakdown is used to limit the voltage excursion of the reverse leakage current, while the thyristor element acts as a latch-up circuit, allowing current to be shunted to a low-impedance path. This reduces the voltage drop across the circuit, allowing the reverse diode to protect against additional surges.

It also includes a Dual Common Mode (DCM) ESD protection circuit, which is composed of two series diodes that are configured to pass the surge current in the forward direction and limit the current to the critical breakdown voltage. This provides a highly reliable and effective protection against ESD events. The device also has an EFT protection circuit which is designed to limit the voltage level to a safe level.

The device is capable of protecting against both ESD and EFT transients by providing a fast and reliable response. It is designed to have low clamping voltage, so it will not cause any damage to the protected equipment. Due to its high surge capability, the device is capable of absorbing multiple surges without having to be replaced. In addition, it has a very long service life and can operate over a wide range of temperatures.

Overall, SMBJ12A-QH provides an efficient and reliable solution for protecting systems and devices against electrical transients. It is capable of providing a fast and reliable response whilst not causing any damage to the protected equipment. Due to its high surge capability and low clamping voltage, it is an ideal solution for a wide range of applications.

The specific data is subject to PDF, and the above content is for reference