L4008L658

Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Triac Type:	Logic - Sensitive Gate
Voltage - Off State:	400V
Current - On State (It (RMS)) (Max):	8A
Voltage - Gate Trigger (Vgt) (Max):	1.3V
Current - Non Rep. Surge 50, 60Hz (Itsm):	65A, 85A
Current - Gate Trigger (Igt) (Max):	5mA
Current - Hold (Ih) (Max):	10mA
Configuration:	Single
Operating Temperature:	-40°C ~ 110°C (TJ)
Mounting Type:	Through Hole
Package / Case:	TO-220-3 Isolated Tab, Formed Leads
Supplier Device Package:	TO-220 Isolated Tab

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Thyristors are active components used to switch and control the power of an electrical current, and they are also known as TRIACs (TRIode for Alternating Current). L4008L658 is a special type of TRIAC, which is used in various power supply systems, such as UPS (uninterruptible power supplies) and large-scale industrial power plants.The primary role of TRIACs, including L4008L658 type, is to provide smooth, precise control over the output current or the on/off state of the power supply. This makes TRIACs ideal for managing precise current and voltage loads, such as controlling the speed of a motor, dimming of lights, or controlling the temperature in a room.In its simplest form, L4008L658 consists of two thyristors connected in opposite directions in a complementary arrangement, which is essentially a two-thyristor equivalent of a single thyristor. This arrangement ensures that the TRIAC can not only supply current to the load, but can also switch off the circuit by blocking the current flow in both directions.To understand how a TRIAC works, it is important to consider the behavior of the power supply load when the TRIAC is switched off. When the TRIAC is off, the load is essentially disconnected, and in most cases, the voltage drops to zero. This is because the load is essentially "floating," meaning that the TRIAC is no longer providing any current or voltage to the load.When the TRIAC is switched on, it works together with the load to provide voltage and current to the load. This is accomplished by controlling the gate to cathode voltage, which is used to switch on the TRIAC. When this voltage is applied to the gate of the TRIAC, it will allow a current to flow from the anode to the cathode and then to the load. This current will help to maintain the required voltage level across the load and will keep the circuit functioning as intended.The gates of TRIACs, including L4008L658, also provide overload protection, in that they will trip when current levels exceed the predetermined limits of the TRIAC. This helps to protect the TRIAC from being damaged, while also providing a safe operating environment for the load and the TRIAC itself.In addition to providing overload protection, TRIACs, including L4008L658, can also be used to provide control of the on/off current or the voltage of the power supply. This is accomplished by controlling the gate voltage. By changing the voltage, the TRIAC can be adjusted to provide the desired level of current or voltage to the load.In conclusion, L4008L658 is a special type of TRIAC that is used in various power supplies. By controlling the gate voltage, it can be used to provide precise control of the output current or the on/off state of the power supply. It also provides overload protection, protecting the TRIAC from damage and creating a safe operating environment for the load and the TRIAC itself.

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