Q4006R4

Series:	--
Packaging:	Bulk
Part Status:	Discontinued at Digi-Key
Triac Type:	Standard
Voltage - Off State:	400V
Current - On State (It (RMS)) (Max):	6A
Voltage - Gate Trigger (Vgt) (Max):	1.3V
Current - Non Rep. Surge 50, 60Hz (Itsm):	65A, 80A
Current - Gate Trigger (Igt) (Max):	25mA
Current - Hold (Ih) (Max):	50mA
Configuration:	Single
Operating Temperature:	-40°C ~ 125°C (TJ)
Mounting Type:	Through Hole
Package / Case:	TO-220-3
Supplier Device Package:	TO-220AB

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Thyristors - TRIACs

Q4006R4 Application Field and Working Principle

A TRIAC, or bidirectional triode thyristor, is a semiconductor device with three terminals capable of controlling a large power load from either AC or DC sources, depending on the specific application requirements. It is commonly used for switching digital signals and for controlling power to home and industrial appliances such as motors, fans, heating systems, lighting, and latches. The Q4006R4 is a 4A TRIAC, which is suitable for general switch control and light dimming, as well as power factor correction, motor speed control, and other circuits with high power requirements.The Q4006R4 is a triac with a maximum repetitive peak off-state voltage, or VDRM, of 400V, and a total gate current of 2mA. This device is suitable for low power applications, and its gate current rating ensures it can be switched off quickly when needed. It has an isolation resistance of 2500Vrms, and can be mounted on a PCB with a 3mm terminal pin.The working principle of the Q4006R4 is based on the thyristor principle. It is an electric switch that uses a thyristor to switch a large amount of electrical current between two points. A positive gate voltage applied to the TRIAC causes a current to flow through the device. This current then increases as the voltage increases, until the current reaches a maximum value when the voltage reaches a level called the breakover voltage. When the breakover voltage is reached, the thyristor switches on, allowing full current to flow between the two points.The process of switching a TRIAC is similar to that of a diac but with some important differences. The main difference is that a diac can only conduct current in one direction, while a TRIAC can conduct current in both directions. This is due to the fact that the TRIAC has three terminals, not just two as in the diac. The gate voltage controls the timing and magnitude of current flowing through the TRIAC, while the main terminals (MT1 and MT2) control the charge and discharge of current.In summary, the Q4006R4 is a 4A TRIAC suitable for general switch control, power factor correction, motor speed control, and other high power applications. It has a maximum VDRM of 400V and requires a 3mm terminal pin for mounting on a PCB. The device works on thyristor principle, with a positive gate voltage controlling the timing and magnitude of current flow, and its two main terminals controlling charge and discharge.

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