The LED and the photo-transistor each may operate off a different circuit or voltage supply, so these components may be used to translate one circuit voltage to another.Īllowing the connection from one voltage level to another. Two of the most common design applications include voltage translation and circuit isolation. Opto-Couplers or Opto-Isolators may be used for any number of circuit applications. Inverter gates are also common output interfaces.Ī single channel is depicted, but any number of individual channels are possible. This example uses an external logic input, other types have no input to the gate. The NAND gate output is one of the common logic gates. Standard 5 volt TTL or 3.3 volt low voltage TTL could be interfaced to. The supply pin could be set at any standard voltage. MIL-PRF-19500/548G Electronic Opto Coupler, Solid State Semiconductor Device, MIL-PRF-19500/486G Electronic Opto Coupler, Semiconductor Device, Solid State, The outputs may be transistor/analog or IC/digital outputs. Optocouplers can be used to separate circuits from noise or other sources of interference between different circuit elements. The output of the detector is than used as a control signal in another part of the circuit. An external signal causes the light source to be emitted and than coupled to the light detector. Optocoupler is a device that has both a light source and a light detector in the same package or IC. However it's also common for the output transistor not to bring out the Base lead.Īnother common output transistor is a Darlington as, Photo-darlington.Ī MOSFET is also used as the output detector. The output transistor may have a Base terminal for additional control. The typical opto coupler is a diode emitter feeding a NPN transistor. Note the terms used to describe the products being produced:įor example Optocoupler, Opto-Isolator, Opto-Switch all refer to the same type of component. Related topic Solid State Relays, as they also tend to isolate two circuits. The types of products or devices they produce are listed under the company name, in alphabetic order. This is a listing of Opto-Coupler manufacturers.
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