Q4008RH4

Thyristors - TRIACs

Q4008RH4 is a type of semiconductor triode ac switch (triode for alternating current, TRIAC for short), which can turn on and off alternating current depending on the current through the control of electrode and gate. This product is suitable for resistance and inductance load in general industrial control and general lighting application, and can be used for temperature control and similar Equipment of Motor speed governing.

Application Field of Q4008RH4

The main application fields of Q4008RH4 are load switching, general industrial control applications and motor speed regulation. It is suitable for installing in single or multiple water systems, air conditioners or other indoor units and similar equipment. It can also be used in automation, home appliances and structural electronics.

Moreover, it can be used in various AC power circuits for semiconductor heating, speed regulating, temperature controlling, phased angle controlling, etc. In addition, it is also suitable for the switching of DC system and other small power applications, such as lighting control and building automation.

Working Principle of Q4008RH4

In particular, when a TRIAC (Q4008RH4) is connected to an AC power supply, it can be driven by the control pin to turn on and off. For a three-phase triode TRIAC with three pins, there are two operating modes: symmetrical control mode and independent control mode. The external voltage that drives the control pin is a control signal, when the control signal is on, the TRIAC will conduct; when the control signal is off, the TRIAC will not conduct, thus implementing an ON/OFF control of the TRIAC. It can be said that the application of TRIAC is very convenient in AC power control and switching.

In addition, the gate and cathode pins of the TRIAC must be capable of providing a value of current that drives the base of the TRIAC close enough to the critical voltage so that it will turn on and off. At this time, current will pass through the TRIAC and the load will be connected to the AC voltage.

Therefore, TRIAC can be used to realize bidirectional switching control of AC working conditions, which is much faster and more convenient than mechanical contact. Thus, this type of semiconductor triode can be used in a wide range of applications. In a word, the application of Q4008RH4 TRIAC can realize automatic control, and therefore it is widely used in household appliances and industrial control fields.