QK008LH4

Series:	--
Packaging:	Bulk
Part Status:	Discontinued at Digi-Key
Triac Type:	Alternistor - Snubberless
Voltage - Off State:	1kV
Current - On State (It (RMS)) (Max):	8A
Voltage - Gate Trigger (Vgt) (Max):	1.3V
Current - Non Rep. Surge 50, 60Hz (Itsm):	83A, 100A
Current - Gate Trigger (Igt) (Max):	35mA
Current - Hold (Ih) (Max):	35mA
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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QK008LH4 Application Field and Working PrincipleThyristors - TRIACs are semiconductor devices used for switching and controlling high voltage, high current devices and systems. They are commonly referred to as thyristors and are similar to SCRs but with an additional gate connection for control. The QK008LH4 is a TRIAC (Triode for Alternate Current) that is widely used for controlling high voltage and high-current applications.The QK008LH4 has three pins; main (MT1), gate (G) and common (MT2). Its main feature is its low leakage current ranging from 3μA–50μA, AC gate current of 110mA, and forward blocking voltage of 800V–1000V (VD). It has a maximum repetitive peak off-state voltage of 1600V, a maximum peak gate trigger current of 2mA with a gate trigger voltage of 3V. The QK008LH4 is usually connected in the same way as an SCR, with the anode being connected to MT1 and the cathode connected to MT2. The gate is connected in an open circuit to MT2 and the negative DC supply.The QK008LH4 is most widely used in switching and controlling AC power, such as switching motors, controlling light devices and regulating other appliances. It can also be used for temperature control circuitry, DC-DC converters and lots of other current and voltage regulating applications.The working principle of the QK008LH4 is based on the principle of a thyristor. A TRIAC is a three-terminal device with a Main (MT1), Gate (G) and Common (MT2) terminal. When MT1 is positive with respect to MT2, charge carriers are injected into the P-N junction between MT1 and MT2. This causes a voltage drop in the MT2 – G junction, which is primarily determined by the bias current. When MT2 gets more positive with respect to MT1 due to the voltage drop, it causes more current to flow into MT2 and the voltage drop is increased further. This is called “forward-biased current” and causes the TRIAC to turn on.When the gate voltage begins to drop again, the current between MT1 and MT2 drops as well and eventually reaches zero, when the TRIAC turns off. When the gate voltage rises again, the voltage drop in the MT2 – G junction increases, and the current through MT1-MT2 begins to flow again, thus turning the TRIAC back on. This process is repeated until the gate current drops to 0, thus completely shutting down the TRIAC.In conclusion, the QK008LH4 is a widely used TRIAC for various high voltage and high current applications and its working principle is based on the principle of a thyristor. The QK008LH4 is connected in a similar way as an SCR, with the anode being connected to MT1 and the cathode connected to MT2, and the gate being connected in an open circuit to MT2 and the negative DC supply. It is useful in a variety of applications such as switching motors, controlling light devices, regulating other appliances, temperature control, DC-DC converters, and lots of other current and voltage regulating applications.

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