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H21A3 Datasheet Phototransistor Optical Interrupter Switch

Manufacturer: Fairchild (now onsemi)

Overview: H21A1 / H21A2 / H21A3 PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH PACKAGE DIMENSIONS 0.972 (24.7) 0.957 (24.3) 0.472 (12.0) 0.457 (11.6) C L 0.249 (6.35) 0.243 (6.

General Description

The H21A1, H21A2 and H21A3 consist of a gallium arsenide infrared emitting diode coupled with a silicon phototransistor in a plastic housing.

The packaging system is designed to optimize the mechanical resolution, coupling efficiency, ambient light Ø 0.133 (3.4) Ø 0.126 (3.2) (2X) C L 0.39 (1.00) 0.34 (0.85) 0.755 (19.2) 0.745 (18.9) .073 (1.85) .133 (3.38) 0.129 (3.3) 0.119 (3.0) Optical C L rejection, 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.

Key Features

  • 0.110 (2.8) 0.091 (2.3).
  • Opaque housing.
  • Low cost.
  • .035” apertures.
  • High IC(ON) 1. Derate power dissipation linearly 1.33 mW/°C above 25°C. 2. RMA flux is recommended. 3. Methanol or isopropyl alcohols are recommended as cleaning agents. 4. Soldering iron tip 1/16” (1.6mm) minimum from housing. 2 3 2 1 3 4 PIN 1 ANODE PIN 2.

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More Datasheets from Fairchild (now onsemi)

Part Number Description
H21A PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH
H21A1 PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH
H21A2 PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH
H21A4 PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH
H21A5 PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH
H21A6 PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH
H21B1 PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH
H21B2 PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH
H21B3 PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH
H21B4 PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH

H21A3 Distributor