The H21B4 H21B5 and H21B6 consist of a gallium arsenide Infrared Emitting Diode coupled with a silicon photodarlington in a plastic housing. The packaging system is designed to optimize the mechanical resolution, coupling efciency, ambient light rejec- tion, cost and reliability. 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 By Fairchild Semiconductor
H21B6 's PackagesH21B6 's pdf datasheet

H21B6 Pinout, Pinouts
H21B6 pinout,Pin out
This is one package pinout of H21B6,If you need more pinouts please download H21B6's pdf datasheet.

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