PC3H7D

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Optoisolators are electronic components consisting of a transmitter and a receiver to isolate two circuits. The opto-isolator PC3H7D is a Optoisolators - Transistor, Photovoltaic Output. The PC3H7D is a dual optical triac driver packaged in an 8-pin DIP with a physical dimension of 58.6mm x 5.2mm x 13.7mm. It drives two optically isolated TRIACs, giving a combined current of up to 1.2A and a voltage of 400V.

The PC3H7D has a wide range of applications in various fields. It can be used as an interface between digital and analog sections in industrial control systems, automation equipment, and appliances like washing machines, air conditioners and refrigerators. It can also be used to switch low power relays and motors, providing a low on-state resistance. Additionally, the PC3H7D can be used as an obviation switch for AC power control, providing optical isolation between the logic controlling and the power side.

The working principle of the PC3H7D is based on a CMOS integrated circuit that consists of two input circuits connected together through optically isolated transmission. The two input circuits include an input control circuit and an output control circuit. The input control circuit receives an input signal from an external source and the output control circuit controls the output power connected to the load. The light emitting diode (LED) emits light in response to the input signal, which is detected by the phototransistor (PT) in the housing that produces a proportional output. The output control circuit provides an AC voltage with accurate phase control in response to the input signal.

The output of the PC3H7D is driven by two external transistors, the gate-controlled TRIAC and the power transistor. The gate-controlled TRIAC is a three-terminal semiconductor switch that switches on and off the flow of the load current when a gate signal is applied or removed. The power transistor is used to increase the switching performance of the gate-controlled TRIAC. Both components can be connected to a variety of load types, such as lights, small motors, Solid State Relays (SSRs) and relays.

In conclusion, the PC3H7D is an optoisolator - Transistor, Photovoltaic Output, designed with the intention of providing a high quality and reliable interface between digital and analog sections. It has many applications in a variety of fields and works by detecting an input signal and providing an AC voltage output with an accurate phase control. Additionally, it is driven by two external transistors, the gate-controlled TRIAC and the power transistor, that work together to provide a reliable and precise control of the load current.

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