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Photointerrupter Transmissive 3.3MM Phototransistor 4 Pin Rail

View H21A3: Opto-Electronic Interrupter Switch with Transistor Sensors High Gain

H21A3: Opto-Electronic Interrupter Switch with Transistor Sensors High Gain

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Jameco Part no. 320901
Manufacturer   MAJOR BRANDS
Manufacturer no. H21A3
Catalog 151 , page 18
Learn more about Major Brands.
Pricing & Availability


# of Unit Price
1+ $2.75
10+ $2.49
100+ $2.25
  • Availability:Ship  1 Days ARO 

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Opto-Electronic Interrupter Switch with Transistor Sensors

The H21A series of opaque photointerrupters are single channel switches consisting of a Gallium Arsenide infrared emitting diode and a NPN silicon photo transistor mounted in a polycarbonate housing. The package is designed to optimize the mechanical resolution, coupling efficiency, ambient light rejection, cost and reliability. Operating on the principle that objects opaque to infrared will interrupt the transmission of light between an infrared emitting diode and a photo sensor switching the output from an "ON" state to an "OFF" state.

  • High gain
  • 3.3mm gap between LED and detector
  • Polycarbonate case protected against ambient light
  • Forward current: 50mA
  • Reverse voltage: 6V
  • Power dissipation: 100mW
  • 4-pin package with tab

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  • Specification Value
    Maximum Reverse Voltage6V
    Output DevicePhototransistor
    Slit Width0.889mm
    Minimum Operating Temperature-55°C
    Maximum Operating Temperature100°C
    MountingThrough Hole
    Product Width6.35mm(Max)
    Specification Value
    Product Height11mm(Max)
    Product Length24.7mm(Max)
    Product TypePhotointerrupter
    Maximum Power Dissipation150mW
    Maximum Collector Emitter Voltage30V
    Number of Channels per Chip1
    Maximum Forward Current50mA
    Gap Width3.3mm
    Maximum Collector Current20mA

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