Datasheet H21B1, H21B2, H21B3 (Fairchild)

PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH H21B1 H21B2 H21B3 PACKAGE DIMENSIONS
0.972 (24.7) 0.957 (24.3) Ø 0.133 (3.4) 0.472 (12.0) Ø 0.126 (3.2) 0.457 (11.6) (2X) CL + D 0.249 (6.35) 0.243 (6.15) L C E + 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 Optical C 0.433 (11.0) L 0.422 (10.7) 0.125 (3.2) 0.315 (8.0) 0.119 (3.0)
SCHEMATIC
L C .295 (7.5) 0.110 (2.8) .272 (6.9) 0.091 (2.3) PIN 1 ANODE 4 PIN 2 CATHODE 1 2 3 PIN 3 COLLECTOR 1 4 PIN 4 EMITTER 0.020 (0.51) (SQ) NOTES: 2 3 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 Page 1 of 6 6/13/02