H21A1 / H21A2 / H21A3
PHOTO
TRANSISTOR OPTICAL INTERRUPTER SWITCH
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 +
DESCRIPTION
The H21A1, H21A2 and H21A3 consist of a gallium arsenide infrared emitting diode coupled with a silicon photo
transistor in a plastic housing.
The packaging system is designed to optimize the mechanical resolution, coupling efficiency, ambient light
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)
.
073 (1.
85) .
133 (3.
38)
0.
129 (3.
3) 0.
119 (3.
0) Optical C L
rejection, cost and reliability.
The gap in the housing provides a means of interrupting the signal with an opa...