Saturday, January 12, 2013

Electronic Component Optocoupler WYC H21A3 Low Cost

Figure 1. Optocoupler H21A3 Connecting

Robometricschool. - In edition kind of electronic components, we will give you information about electronic sensor component that you can use to make shaft encoder for your electronic or robot project. This component is Optocoupler WYC H21A3 with low cost and easy to get it in the electronic shop.  

Optocoupler H21A3 is kind of photo-transistor optical interrupter switch that be designed with gallium arsenide infrared emitting diode coupled with a silicon phototransistor in a plastic housing. Also for the packaging system is designed to optimize the mechanical resolution, coupling efficiency, ambient light rejection, cost and reliability. And the gap in the housing provides a means of interrupting the signal with an opaque material, switching the output from an “ON” to an “OFF” state. With this design, Optocoupler H21A3 very compatible to make ON and OFF condition from rotate field.

Figure 2. Optocoupler H21A3 Package Dimension
There are four features that you must now of H21A3 before you are use this optocoupler component:
  1. Opaque Housing. Optocoupler H21A3 usually using dark color like Black. 
  2. Low Cost. You can get Optocoupler H21A3 component more than $0.1 in electronic shop.
  3. 0.035” apertures. Optocoupler H21A3 having small apertures 0.035". It make this component need few place in our project.
  4. High Collector current ON (Ic On) and H21A3 can be used  in voltage divider with resistor.
Optocoupler H21A3 schematic

Figure 3. Optocoupler H21A3 Electronic Schematic

  1. Number 1 is PIN ANODE
  2. Number 2 is PIN CATHODE
  3. Number 3 is PIN COLLECTOR
  4. Number 4 is PIN EMITTER
Physically of Optocoupler H21A3

Figure 4. Physic of Optocoupler H21A3
Figure 5. Other Physical of Optocoupler H21A3

Reference: - Datasheet Optocoupler H21A1/H21A2/H21A3


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