SMAJ16CA-Q

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Transient voltage suppressor (TVS) devices are engineered to protect against the sudden voltage surges and spikes caused by lightning, electrostatic discharge, inductive load switching and other sources. The SMAJ16CA-Q is a unidirectional TVS diode designed to protect against transient overvoltage and surges. This product is designed to protect low voltage circuits that are vulnerable to power disturbances from external and internal sources.

Application Field

The SMAJ16CA-Q is mainly used inLow voltage applications. These include 5V systems, 12V systems (such as automotive electronics), CAN-bus systems, RS-232/422/485 interfaces, stereo systems, power supplies, digital cameras, USB ports, set top boxes, and other consumer electronics. The applications of the SMAJ16CA-Q include:

• Telecommunications and networking equipment, including computer peripherals, hubs, routers, and switches
• Computer systems, including PCs, laptops, workstations, and servers
• Industrial and process control systems, including pumps, conveyers, and other production machinery
• Consumer and domestic appliances, including TVs, washing machines, other white goods, and audio/video equipment
• Avionics and aerospace systems, including embedded or networked controls
• Automotive and heavy vehicle electronics, including ECUs, dashboards, audio/media centers, and safety systems

Working Principle

The SMAJ16CA-Q is designed to protect against transient overvoltage and surges. It utilizes a Zener diode for breakdown voltage to protect against overvoltage, as well as a protecting component against transient surges and inductive switching.

When a transient surge occurs, the Zener diode will start conducting immediately. This conducts the surge to the ground until the surge dissipates. The surge current is limited by the resistance of the diode in series with the current. When the surge current flows through the diode, it will generate heat and the voltage across the diode will rise. When the voltage reaches the breakdown voltage of the diode, the diode will start to conduct current above the rated maximum current.

The protection component is a specially designed flyback element, which holds the voltage across the diode, once the surge current is removed. The flyback element slowly returns the voltage to the normal level, protecting the device against rapid voltage shifts.

Conclusion

The SMAJ16CA-Q is designed to provide a comprehensive protection solution from transient overvoltage and surges. It utilizes a Zener diode for surge protection as well as a flyback element for transient surge protection. It is particularly well suited for low voltage applications, such as automotive and consumer electronics, computer systems, telecommunication and networking equipment, avionics and aerospace systems, etc.

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