Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Triac Type:	Alternistor - Snubberless
Voltage - Off State:	800V
Current - On State (It (RMS)) (Max):	8A
Voltage - Gate Trigger (Vgt) (Max):	1.3V
Current - Non Rep. Surge 50, 60Hz (Itsm):	80A, 85A
Current - Gate Trigger (Igt) (Max):	35mA
Current - Hold (Ih) (Max):	35mA
Configuration:	Single
Operating Temperature:	-40°C ~ 125°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	TO-252-3, DPak (2 Leads + Tab), SC-63
Supplier Device Package:	TO-252, (D-Pak)

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A TRIAC, or Triode for Alternating Current, is an active semiconductor device that is used as a switch or modulator in AC electrical circuits. It works by creating a bidirectional circuit where current flows in both directions between the terminals. The device is often used in industrial, commercial, and consumer applications. The Q8008DH4 is a TRIAC produced by Fairchild and is designed to be used in several different applications. It is a medium power TRIAC, capable of carrying up to 8A, with a peak off-state voltage of 800V. The device offers a variety of features, such as a high voltage breakdown and a fast switching speed, making it suitable for applications such as heater control, lighting control, and motor speed control. The Q8008DH4 works by sensing the voltage or current in an AC load and then opening or closing the connection based on the input. It works by having two internal gates. The main gate (MT1) is used to initiate the current flow and the second gate (MT2) is used to maintain the current flow. When the main gate is triggered, the device switches on and current flows through the load. When the current falls below the holding current, the device switches off and no current flows. The Q8008DH4 has several advantages over other TRIACs, such as its high current carrying capacity,fast switching speed, and low price. Its low turn-on voltage requirement makes it ideal for low-voltage applications, and its wide variety of controlling structures make it suitable for a wide range of applications.The typical way of turning on the Q8008DH4 is by applying a trigger pulse to its gate. When the voltage applied to the gate exceeds a certain threshold, the main gate switches on, and this causes the device to conduct current through the load. This process is known as gating or firing. In order to switch the device off, the trigger pulse can be stopped or the current through the load can be reduced. When the leakage current reaches a certain level, the device switches off. This ensures that the device will not stay on indefinitely and that the current can be controlled accurately.Overall, the Q8008DH4 is a reliable and cost-effective TRIAC that can be used in a variety of applications. Its features make it suitable for medium power AC circuits and its ability to be triggered make it suitable for a wide range of applications. Its flexibility makes it a popular choice for industrial and consumer applications.

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