L4004V3

Series:	--
Packaging:	Bulk
Part Status:	Discontinued at Digi-Key
Triac Type:	Logic - Sensitive Gate
Voltage - Off State:	400V
Current - On State (It (RMS)) (Max):	4A
Voltage - Gate Trigger (Vgt) (Max):	1.3V
Current - Non Rep. Surge 50, 60Hz (Itsm):	33A, 40A
Current - Gate Trigger (Igt) (Max):	3mA
Current - Hold (Ih) (Max):	5mA
Configuration:	Single
Operating Temperature:	-40°C ~ 110°C (TJ)
Mounting Type:	Through Hole
Package / Case:	TO-251-3 Short Leads, IPak, TO-251AA
Supplier Device Package:	TO-251 (V-Pak/I-Pak)

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Thyristors are a class of semiconductor components including silicon controlled rectifier (SCR), diac and triac. They are a special type of transistor, used extensively in power control and amplification circuits. The L4004V3 is one of the triac series. It is a logic-level gate four-quadrant TRIAC with low trigger current, high isolation voltage and high temperature stability. Its application fields and working principle will be discussed here. The L4004V3 is ideal for use in AC switching and phase control applications, such as AC motor speed control, home appliance control and industrial automation. It is also suitable for various inductive loads and resistive loads, including incandescent lamps, ballast lamps, resistive heating, heat pumps and humidifiers. Furthermore, due to its low trigger current, the L4004V3 can be used in many electronic circuits that need a low operating voltage. The L4004V3 is a thyristor composed of three layers: anode, gate and cathode. The two thyristor layers consist of a P-type semiconductor layer and an N-type semiconductor layer. At the beginning, the gate is kept open, leaving the anode and cathode terminals isolated from each other. When the gate is driven to the threshold voltage, an avalanche current flows between the anode and cathode, triggering the thyristor to perform its function. When the trigger gate of the L4004V3 is greater than the VGT (Gate Threshold Voltage) of the thyristor, a light trigger current is conducted to the anode and the thyristor enters the conduction stage. The anode and cathode are no longer isolated from each other. The thyristor then remains conducting during the period of applied voltage, regardless of the trigger gate voltage. The L4004V3 has built-in temperature protection and overvoltage protection features. The built-in temperature protection circuit disables the thyristor when the temperature of the device is higher than the rated temperature. And the overvoltage protection circuit disables the thyristor when the anode-cathode voltage exceeds the rated voltage. The L4004V3 is a four-quadrant TRIAC that can be used extensively in AC switching, phase control and other power control applications. Its low trigger current, high isolation voltage, high temperature stability and built-in temperature protection and overvoltage protection features make it ideal for various circuits. By understanding its application fields and working principle, users can better utilize the L4004V3 for their applications.

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