CQ218I-25D

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Thyristors - TRIACs are solid-state power switches that enable power to flow in both directions. The CQ218I-25D is a TRIAC-based power switch ideal for AC circuits. It is a thyristor that is especially suitable for AC switching, application fields and its working principle are included in this article.

Application Fields

CQ218I-25D is designed to be an excellent solution for protecting AC circuits against short circuits, overvoltages, and overloads.

• Telecommunications - The CQ218I-25D can be used to control power to phone equipment, computers, and other telecommunication components.
• Industrial / Building Automation - The CQ218I-25D can be used to protect motor drives, lighting controllers, and other industrial components.
• AC circuit isolation - The CQ218I-25D can be used to isolate circuits from an AC power source, allowing the circuit to be switched off and on separately from the AC power source.

The CQ218I-25D can also be used in AC circuit monitoring, precise AC power control, AC load protection and conditioning, and AC motor protection.

Working Principle

The CQ218I-25D is a TRIAC-based power switch that works through the controlled gating of the current flowing through two bidirectional SCRs (Silicon Controlled Rectifiers). The two SCRs are connected in series, with the anode of one SCR connected to the gate of the other SCR. As current passes through the anode and cathode of the two SCRs, the gate of the first SCR is turned on, allowing current to flow through the second SCR, with the current flow reversed when the second SCR is turned on.

The TRIAC itself is essentially a combination of two SCRs connected in a single package. When triggered by a gate voltage, the TRIAC essentially acts as a switch, allowing current to flow in both directions across its terminals. Unlike regular switches, the TRIAC is able to maintain the current flow for either positive or negative half-cycles of the AC current waveform.

The CQ218I-25D is a high-voltage, low-current TRIAC. Therefore, it is able to switch AC current at up to 600V/2A. The device is equipped with over-temperature, over-voltage, over-current, and short-circuit protection features.

Conclusion

The CQ218I-25D is a TRIAC-based power switch designed for AC circuits. It is an excellent solution for AC circuit protection, isolation, monitoring, and motor protection. The device is protected against voltage, current, and temperature abnormalities and is able to switch AC current at up to 600V/2A.

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