Q8010RH5

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Thyristors - TRIACs: Q8010RH5 Application Field and Working Principle

A TRIAC is a three-terminal semiconductor switch capable of controlling both AC and DC current. Specifically, the Q8010RH5 is a TRIAC with a glass passivated, sensitive gate that is suitable for general purpose and style B applications. The device has been designed for AC switching, light dimming, speed control, and phase control applications. This article will focus on the application field and working principle of this particular TRIAC.

Application Field

The Q8010RH5 is a medium power TRIAC that has an 800V VDRM blocking voltage, 10A total dissipation, and a 5A hold current. It has an 18.8A surge current capability and a gate triggering voltage of 1.4V max. Its maximum gate current rating is 50mA. It is a very versatile device as it can be used to switch electrical devices such as lighting, motors, pumps, solenoids, heaters, etc. It can also be used to activate alarms or signaling systems, or to rectify AC power in AC-DC bridge circuits.

In addition to the variety of general-purpose devices the Q8010RH5 TRIAC can control, the devices can also be used to implement sophisticated lighting systems. This includes AC switching dimmers, phase control dimmers, and light-dependent relay (LDR) switching. It is also widely used in lighting control because of its high surge current capability, its low on-state voltage drop, and its exceptionally low gate trigger current.

Working Principle

The TRIAC works by turning one side of an AC circuit off. This is done by passing a current through the gate of the TRIAC, which activates it and causes it to operate. For the TRIAC to close and allow current to flow, the gate must receive a current of at least 1.4V. When this happens, the TRIAC conducts current in both directions through either side of the AC circuit.

The TRIAC can be easily turned off by removing the gate current. This completely shuts off the current and the TRIAC turns off. Because the maximum gate current is a relatively small 50mA, the TRIAC is capable of fast switching, as it takes much less time to turn off and on than a conventional mechanical switch. This makes it an ideal choice for AC lighting dimming and speed control applications, as the TRIAC can be rapidly activated and deactivated.

Conclusion

The Q8010RH5 is a medium power TRIAC that is suitable for several general purpose and style B applications. It has an 800V VDRM blocking voltage, 10A total dissipation, 5A hold current, and 18.8A surge current. Its maximum gate current rating is 50mA and its gate triggering voltage is 1.4V max. The TRIAC is widely used in electronics applications, ranging from lighting control to AC-DC bridge circuits, and its fast switching capabilities make it especially suitable for AC dimming applications. By understanding its application field and working principle, designers can utilize this device to develop highly-efficient projects.

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