H21A4 - PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH
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 mean
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 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) 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) 1 4 2 1 3 4 PIN 1 ANODE PIN 2 CATHODE PIN 3 COLLECTOR PI
H21A4 Features
* Opaque housing
* Low cost
* .035” apertures
* High IC(ON) 2001 Fairchild Semiconductor Corporation DS300291 6/05/01 1 OF 4 www.fairchildsemi.com PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH H21A4 ABSOLUTE MAXIMUM RATINGS Parameter Operating Temperature Storage Temp
