H21A5

PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH H21A4

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PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH H21A4
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

H21A5

H21A6

0.133 (3.4) 0.126 (3.2) (2X)

C L 0.39 (1.00) 0.34 (0.85)

0.755 (19.2) 0.745 (18.9)

0.129 (3.3) 0.119 (3.0) 0.103 (2.60) NOM 0.433 (11.0) 0.422 (10.7) Optical C L

SCHEMATIC
0.125 (3.2) 0.119 (3.0) C L .295 (7.5) .272 (6.9) 0.110 (2.8) 0.091 (2.3) 0.315 (8.0)

2 1

3 4

PIN 1 ANODE PIN 2 CATHODE PIN 3 COLLECTOR PIN 4 EMITTER
0.020 (0.51) (SQ)

NOTES: 1. Dimensions for all drawings are in inches (mm). 2. Tolerance of .010 (.25) on all non-nominal dimensions unless otherwise specified.

DESCRIPTION
The H21A series are 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 efficiency, ambient light 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.

FEATURES
Opaque housing Low cost .035" apertures High IC(ON)
2001 Fairchild Semiconductor Corporation DS300291 6/05/01 1 OF 4 www.fairchildsemi.com