SMCJ400A-H

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TVS diodes offer essential surge protection for sensitive electronics, making them invaluable components in certain industries. The SMCJ400A-H Transient Voltage Suppressor (TVS) Diode from Littelfuse is an example of this, providing superior protection while operating in a range of applications. Here, we explore the potential applications of this device as well as its working principle.

SMCJ400A-H Application Field

SMCJ400A-H has a unique bi-directional transient voltage suppression with common element. This provides absolute protection for reflow sensitive devices such as NAND Flash Memory, TVs and LCD panels. It is a multi-purpose device providing protection against a wide range of situations and applications, including:

• Surge voltages due to lightning
• ESD protection when connected directly to an I/O port
• Operating at high speed
• Multiple VCE flashes
• High ESD immunity
• High current capability
• Pre-bond ESD protection

SMCJ400A-H also has a unique feature that provides superior surge/transient Current capability, typically three times higher than other similar devices. As such, it has become increasingly popular for use in the automotive, consumer electronics, and computer/telecom industries as it provides more efficient protection from power surges.

Working Principle

SMCJ400A-H is a two-terminal, bidirectional TVS diode that is designed for applications requiring high surge current handling capability. The device includes two high-voltage Zener junctions that have different breakdown voltages. When the voltage exceeding the allowable level is applied to the terminals, the Zener junctions will breakdown and become conductive. This will limit the voltage and current throughout the device, which in turn protects the components of the circuit from damage.

To further improve the device\'s surge current capability, a unique dual-mode configuration is implemented. In a normal operating environment, the device operates in the linear region, which allows the diode to conduct a low forward current without exceeding the breakdown voltage of the Zener junction. This allows the device to provide more reliable protection as the current does not rise too sharply when subjected to a high voltage.

When subjected to a higher voltage, the device switches to the avalanche breakdown region, allowing it to conduct a much higher surge current, typically three times higher than other similar devices. This feature ensures that the device will have sufficient current to protect sensitive circuits when subjected to higher voltage levels caused by ESD or power spikes.

Conclusion

The Littelfuse SMCJ400A-H TVS Diode provides superior protection in a wide range of applications, and is a popular choice among automotive, consumer electronics, and computer/telecom industries. With its unique dual-mode configuration, it can handle high surge currents without exceeding the breakdown voltage of its Zener junction, which provides added protection to sensitive circuit components.

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