CQ218-45M

Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Triac Type:	Standard
Voltage - Off State:	600V
Current - On State (It (RMS)) (Max):	45A
Voltage - Gate Trigger (Vgt) (Max):	1.5V
Current - Non Rep. Surge 50, 60Hz (Itsm):	300A @ 100Hz
Current - Gate Trigger (Igt) (Max):	50mA
Current - Hold (Ih) (Max):	80mA
Configuration:	Single
Operating Temperature:	-40°C ~ 125°C (TJ)
Mounting Type:	Through Hole
Package / Case:	TO-218-3
Supplier Device Package:	TO-218

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Thyristors - TRIACs

TRIACs (Triode for Alternating Current) are a type of thyristor which is a type of bidirectional, three-terminal semiconductor device for controlling the current and handling AC signals in order to switch power. TRIACs differ from other thyristors as they have three terminals that enable current to flow in either direction. CQ218-45M is a variation on a TRIAC that is designed specifically for alternating current applications.

CQ218-45M Application Field

The CQ218-45M is typically used in AC voltage and current regulating equipment, such as motor control and AC servo systems. They are also used in general-purpose home appliances, such as blenders, mixers, and slow cookers.

CQ218-45M Working Principle

The TRIAC that is used in the CQ218-45M consists of two P-type semiconductor regions sandwiching a N-type semiconductor region. The N-type region is connected to the AC power supply and its two ends are the anode and cathode. Current flows through the device when the gate voltage is above a triggering threshold. This gate voltage controls the gate current that determines the active state of the device (on or off).In the CQ218-45M, the device is designed to be AC-coupled, which means that it can switch AC currents and voltages without influencing its own operation. This is done by using a trigger circuit that applies an appropriate gate voltage when an AC voltage is detected on the anode and cathode. Thus, the device is effectively isolated from the load, making it suitable for use in applications where the AC load can vary.

Operation

The CQ218-45M operates in two modes – static or triggered mode. In static mode, the device is held in an off state until the gate voltage is raised above the triggering threshold. This is called the "static" or "continuous" mode. Once triggered, the device remains in an on state until the anode-cathode voltage reaches zero or the gate voltage is lowered below the threshold. In triggered mode, the device is held in an off state until the device is triggered. To trigger the device, a voltage signal is applied to the gate. This voltage signal must be sufficient to surpass the triggering threshold voltage range. Once triggered, the device switches to an on state and remains in this state until the supply voltage falls below the threshold. When this occurs, the device reverts to an off state.

Advantages

The CQ218-45M has several advantages over other TRIAC-based devices. Firstly, it is able to switch AC current and voltage without the need for the user to change any external electrical components. This simplifies the design process and reduces the cost of components. Secondly, the device is AC-coupled, meaning that it can handle loads of varying AC voltage and current without influencing its own operation. This makes the CQ218-45M suitable for use in applications where the load is subject to heavy fluctuations. Finally, the CQ218-45M has a low on-state gate current, making it a good choice for applications where low gate current is required. This can reduce power dissipation and extend the life of the device.

Conclusion

The CQ218-45M is a variation on a TRIAC specifically designed for alternating current applications. It is capable of switching AC currents and voltages without influencing its own operation and can handle varying loads. This makes it ideal for applications where load fluctuation is to be expected. The device also benefits from low on-state gate current, making it a good choice for power-sensitive applications.

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