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H21A4 Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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H21A4 Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 4 page + E+ D 2 0.129 (3.3) 0.119 (3.0) 0.433 (11.0) 0.422 (10.7) 0.315 (8.0) 0.110 (2.8) 0.091 (2.3) 1 3 4 0.020 (0.51) (SQ) 0.472 (12.0) 0.457 (11.6) 0.249 (6.35) 0.243 (6.15) 0.39 (1.00) 0.34 (0.85) 0.103 (2.60) NOM 0.125 (3.2) 0.119 (3.0) Ø 0.133 (3.4) Ø 0.126 (3.2) (2X) 0.755 (19.2) 0.745 (18.9) L C CL L C Optical CL 0.972 (24.7) 0.957 (24.3) .295 (7.5) .272 (6.9) PIN 1 ANODE PIN 2 CATHODE PIN 3 COLLECTOR PIN 4 EMITTER PACKAGE DIMENSIONS FEATURES • Opaque housing • Low cost • .035” apertures • High IC(ON) NOTES: 1. Dimensions for all drawings are in inches (mm). 2. Tolerance of ± .010 (.25) on all non-nominal dimensions unless otherwise specified. PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH 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. 4 3 1 2 SCHEMATIC 2001 Fairchild Semiconductor Corporation DS300291 6/05/01 1 OF 4 www.fairchildsemi.com H21A4 H21A5 H21A6 |
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