1.5SMC18C

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Transient Voltage Suppressor (TVS) diodes, as a kind of surge protection component, are widely used in AC/DC power supply, home appliances, communication/computer equipment, automotive electronics and other electronic products. These devices provide a combination of bidirectional low impedance protection and short circuit current handling capabilities, while also allowing low capacitance. Among them, 1.5SMC18C is a diode transient voltage suppressor in the SMA package that is especially designed for protecting sensitive electronics against transients caused by lightning and other sources. Let’s take a look at its application field and working principle.

Application Field of 1.5SMC18C

1.5SMC18C can be used in many devices and circuits. Its most common applications are in computer, peripherals, telecommunications, various industrial plants, automotive electronics, home appliances, etc. It can provide a “clean”, low-power protection in a variety of environments. The typical applications include:

• Input/output suppression of automotive electronic circuits
• Power electronics and driver circuits protection
• Telecommunications line card protection
• Power supply and peripheral board protection for computers
• Protection of internet and mobile phone circuits

Working Principle of 1.5SMC18C

1.5SMC18C is a reverse-acting diode with a maximum reverse breakdown voltage of 18V. When reverse voltage is applied to the diode, it begins to conduct. The conduction is limited by the ohmic components of the diode, and the power dissipation of the diode is limited by the temperature coefficient of its protection region. In normal conditions the current is small enough that it will not affect the circuit. However, when a transient pulse is applied to the diode, the current can rise considerably, allowing the device to shunt the transient away from sensitive circuits.

When an overvoltage transient is applied across 1.5SMC18C, it will start conducting as a forward biased diode. The amount of current through the diode is dependent on the parameters such as the junction temperature, diode capacitance and the magnitude and duration of the transient. As the current passes through the diode, it will be clamped to the 15V the diode is rated for, protecting the circuit.

When the transient is over, the diode either returns to a high impedance state or to a reverse blocking state, depending on the forward voltage applied and the junction temperature. In the blocking state, the diode will quickly return to a state where it presents a very high impedance to the circuit, allowing for normal operation to resume.

Conclusion

1.5SMC18C has a wide range of applications in industrial plants, computer and other electronics, and provides a reliable low-output protection system. Its working principle is that when a transient event occurs, the diode will start conducting andclamp the voltage to its rated value while protecting the components from the overvoltage caused by the event. After the transient event is over, the diode will return to its high impedance state, allowing the circuit to resume operation.

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