Q4004LT

Series:	--
Packaging:	Bulk
Part Status:	Discontinued at Digi-Key
Triac Type:	Internally Triggered
Voltage - Off State:	400V
Current - On State (It (RMS)) (Max):	4A
Current - Non Rep. Surge 50, 60Hz (Itsm):	46A, 55A
Current - Hold (Ih) (Max):	40mA
Configuration:	Single
Operating Temperature:	-40°C ~ 125°C (TJ)
Mounting Type:	Through Hole
Package / Case:	TO-220-3 Isolated Tab
Supplier Device Package:	TO-220 Isolated Tab

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Thyristors - TRIACs

TRIACs, or Triode Alternating Current Switches, are a type of thyristors that are most commonly used in electrical circuits today. TRIACs are the most popular type of thyristor because they can control the current flow in both directions on the same circuit, which can be very useful for many applications. The Q4004LT is one popular example of a TRIAC that is used in many electrical circuits.The TRIAC Q4004LT is a general purpose digital switching device, most commonly used to switch electrical loads up to 400V. This type of TRIAC has the ability to operate in the reduced-current mode, allowing for lower power consumption and an increased switching capacity due to obviating the need for a secondary protection circuit. Additionally, the Q4004LT has a minimum off-state voltage of 10V and a maximum switching current of 4A.The Q4004LT is recognized for its considerable functionality as a fast, low-cost TRIAC switch. The Q4004LT is designed specifically for use in lower power, static switching applications such as lighting and consumer electronics. The Q4004LT is frequently paired with logic integrated circuits or microprocessors and is used in a variety of consumer devices, including televisions, washers and dryers, microwave ovens, and consumer-grade appliances.The Q4004LT can be best explained by understanding the operation of a TRIAC, which is a three-terminal semiconductor device that can control the current of an electrical circuit. A TRIAC is a special type of thyristor that is designed to allow current to flow through two opposing directions, allowing it to switch an AC (alternating current) signal on or off. TRIACs are used for AC signals because they can switch both positive and negative polarities.When a positive voltage is applied to the gate of the TRIAC, a current path is created between the main terminal and the gate terminal. This results in current flowing through the TRIAC, and the current remains until the gate current is cut off. The TRIAC will then turn off, interrupting the current path. The Q4004LT is designed with greater sensitivity than other TRIACs, allowing it to reduce the energy required to switch on and off the current.When using the Q4004LT in an electrical circuit, it is important to ensure that the circuit is correctly rated according to its needs. If the circuit is overloaded, it could damage the TRIAC, causing it to short circuit and creating a safety hazard. Additionally, the circuit must also be capable of handling the maximum current specified in the Q4004LT’s datasheet.In summary, the Q4004LT is a popular TRIAC switch designed for low-power static switching applications. It offers many features, such as low power consumption and increased switching capacity, that make it well-suited for use in a wide variety of consumer electronics. In order to ensure that it is properly used, it is important to correctly rate the circuit according to its needs and follow the specifications in the Q4004LT’s datasheet. Doing so will ensure that the circuit is protected from damage and is operating safely.

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