H21B2

PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH

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PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH
H21B1
PACKAGE DIMENSIONS
0.972 (24.7) 0.957 (24.3)

H21B2

H21B3

0.472 (12.0) 0.457 (11.6)
C L

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

0.249 (6.35) 0.243 (6.15)

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

0.125 (3.2) 0.119 (3.0)
C L .295 (7.5) .272 (6.9)

0.315 (8.0)

SCHEMATIC
0.110 (2.8) 0.091 (2.3)

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 H21B1, H21B2 and H21B3 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 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)

2002 Fairchild Semiconductor Corporation

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6/13/02