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What is H21B3?

This electronic component, produced by the manufacturer "Fairchild Semiconductor", performs the same function as "PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH".


H21B3 Datasheet PDF - Fairchild Semiconductor

Part Number H21B3
Description PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH
Manufacturers Fairchild Semiconductor 
Logo Fairchild Semiconductor Logo 


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PHOTODARLINGTON
OPTICAL INTERRUPTER SWITCH
H21B1
PACKAGE DIMENSIONS
0.249 (6.35)
0.243 (6.15)
0.972 (24.7)
0.957 (24.3)
0.472 (12.0)
0.457 (11.6)
CL
+D
E+
0.755 (19.2)
0.745 (18.9)
Ø 0.133 (3.4)
Ø 0.126 (3.2)
(2X)
CL
0.39 (1.00)
0.34 (0.85)
0.103 (2.60) NOM
0.129 (3.3)
0.119 (3.0)
0.433 (11.0)
0.422 (10.7)
Optical
CL
0.125 (3.2)
0.119 (3.0)
.295 (7.5)
.272 (6.9)
CL
0.315 (8.0)
0.110 (2.8)
0.091 (2.3)
23
14
PIN 1 ANODE
PIN 2 CATHODE
PIN 3 COLLECTOR
PIN 4 EMITTER
0.020 (0.51) (SQ)
NOTES:
1. Dimensions for all drawings are in inches (mm).
2. Tolerance of ± .010 (.25) on all non-nominal dimensions unless
otherwise specied.
H21B2
H21B3
SCHEMATIC
4
1
23
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

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H21B3 equivalent
PHOTODARLINGTON
OPTICAL INTERRUPTER SWITCH
H21B1
H21B2
Figure 4. Leakage Current vs. Temperature
DETECTOR
EMITTER
104
NORMALIZED TO
VCE = 25 V
TA = 25 °C
103
VCE = 25 V
104
103
102
VCE = 10 V
102
NORMALIZED TO
VR = 5 V
TA = 25 °C
10 10
H21B3
11
0.1 25
50 75 100
T A, AMBIENT TEMPERATURE (°C)
0.1 25
50 75 100
T A, AMBIENT TEMPERATURE (°C)
Figure 5. Switching Speed vs. RL
4
IF
RL
+
2 VCC
PW = 300 µs
1 PRR = 100 pps
.8
IF =
7.5
RL
AMPS, VCC = 5V
.6 NORMALIZED TO
.4 RL = 750
toff
ton
.2
0.1
10
20
40 60 80 100
200
400 600 800 1000 1500
75 750
RL , LOAD RESISTANCE ()
Figure 6. Output Current vs. Distance
d, DISTANCE (mils)
1.00
78.7 157.5 236.2 315
393.7
.1
BLACK
SHIELD
.01
+D
E+
d
o
.001
.00010
2
46
d, DISTANCE (mm)
NORMALIZED
TO VALUE WITH
SHIELD
REMOVED
BLACK
SHIELD
d
o
8 10
© 2002 Fairchild Semiconductor Corporation
Page 5 of 6
6/13/02


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for H21B3 electronic component.


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