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H21A1 - PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH

General Description

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

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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📁 Similar Datasheet

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Other Datasheets by Fairchild (onsemi)

Part Number Description
H21A PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH
H21A2 PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH
H21A3 PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH
H21A4 PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH
H21A5 PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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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 (6.15) + E D + 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. 0.433 (11.0) 0.422 (10.