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
脴 0.133 (3.4)
脴 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
PIN 4 EMITTER
0.020 (0.51) (SQ)
2
3
NOTES:
1. Dimensions for all drawings are in inches (mm).
2. Tolerance of 鹵 .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 鈥淥N鈥?to an 鈥淥FF鈥?state.
FEATURES
鈥?Opaque housing
鈥?Low cost
鈥?.035鈥?apertures
鈥?High I
C(ON)
錚?/div>
2001 Fairchild Semiconductor Corporation
DS300291
6/05/01
1 OF 4
www.fairchildsemi.com
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