Transmissive Sensor
HOA1879
DESCRIPTION
FEATURES
Phototransistor output
Accurate position sensing
Choice of detector aperture
0.125 in.(3.18 mm) slot width
Dust protective housing
The HOA1879 series consists of an infrared emitting
diode facing an NPN silicon phototransistor encased in
a black IR transmissive thermoplastic housing. Detector
switching takes place whenever an opaque object
passes through the slot between emitter and detector.
The HOA1879 series employs an IR transmissive
housing which features smooth optical faces without
external aperture openings; this feature is desirable
when aperture blockage from airborne contaminants is
a possibility. The HOA1879-011 and -012 have a 0.060
in.(1.52 mm) dia. detector aperture, while the HOA1879-
015 has a 0.010 in.(.25 mm) x 0.040 in. (1.02 mm)
vertical aperture in front of the detector. This feature is
ideal for use in applications where maximum position
resolution is desired. The HOA1879 series employs
plastic molded components. For additional component
information see SEP8506 and SDP8406.
Housing material is IR transmissive polysulfone.
Housings are soluble in chlorinated hydrocarbons and
ketones. Recommended cleaning agents are methanol
and isopropanol.
DIM_051.cdr
INFRA-40.TIF
OUTLINE DIMENSIONS in inches (mm)
3 plc decimals
0.010(0.25)
Tolerance
2 plc decimals
0.020(0.51)
Honeywell reserves the right to make
changes in order to improve design and
supply the best products possible.
h
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Transmissive Sensor
HOA1879
ELECTRICAL CHARACTERISTICS
UNITS
TEST CONDITIONS
MIN
PARAMETER
SYMBOL
TYP
MAX
IR EMITTER
DETECTOR
COUPLED CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
(25C Free-Air Temperature unless otherwise noted)
Operating Temperature Range
-40C to 85C
Storage Temperature Range
-40C to 85C
Soldering Temperature (5 sec)
240C
IR EMITTER
Power Dissipation
100 mW []
Reverse Voltage
3 V
Continuous Forward Current
50 mA
DETECTOR
Collector-Emitter Voltage
30 V
Emitter-Collector Voltage
5 V
Power Dissipation
100 mW []
Collector DC Current
30 mA
SCHEMATIC
Honeywell reserves the right to make
changes in order to improve design and
supply the best products possible.
h
311
Transmissive Sensor
HOA1879
IRED Forward Bias Characteristics
gra_092.ds4
Forward voltage - V
F
o
r
w
a
r
d
c
u
r
r
e
n
t
-
m
A
0
10
20
30
40
50
60
70
80
90
100
0.8
1.0
1.2
1.4
1.6
1.8
2.0
Pulsed
condition
T
A
= 25 C
T
A
= 80 C
T
A
= -40 C
Fig. 1
Non-Saturated Switching Time vs
Load Resistance
gra_096.ds4
Load resistance - Ohms
R
e
s
p
o
n
s
e
t
i
m
e
-
s
1
10
100
1000
10
100
1000
10000
Phototransistor
Photodarlington
Fig. 2
Dark Current vs
Temperature
gra_301.cdr
Fig. 3
Collector Current vs
Ambient Temperature
gra_095.ds4
Free-air temperature - C
N
o
r
m
a
l
i
z
e
d
c
o
l
l
e
c
t
o
r
c
u
r
r
e
n
t
0.0
0.6
1.2
-50
0.4
0.2
0.8
1.0
-25
0
25
50
100
75
Fig. 4
All Performance Curves Show Typical Values
Honeywell reserves the right to make
changes in order to improve design and
supply the best products possible.
h
312
Transmissive Sensor
HOA1879
Honeywell reserves the right to make
changes in order to improve design and
supply the best products possible.
h
313
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