2 Cogan Ave, Plattsburgh
Northwich, Cheshire
2150 Ward, Montreal
NY, 12901, USA
CW9 7TN, United Kingdom
Que, H4M 1T7, Canada
Tel: 518-561-3160
Tel: 01606-41999
Tel: 514-744-5507
Fax: 514-747-3906
Fax: 01606-49706
Fax: 514-747-3906
STS-8831
Dual Channel Optical Switch Assembly
Over / Under Optical Axis
Features
Non contact switching
Four wires for electrical connection
Fast switching speed
Description
The STS-8831 consists of a pair of infrared emitting
diodes and a pair of NPN phototransistors mounted on
opposite sides of a 5.1 mm. wide slot. Phototransistor
switching takes place whenever an opaque object
passes through the slot. The Phototransistors have a
0.5x1.5 mm internal aperture for increased resolution.
The polysulfone housing (Note 1) reduces interference
from ambient light and provides dirt and dust
protection. 340 mm length wires may be terminated
with an IDC connector upon special order.
Absolute Maximum Ratings
Operating & Storage Temp.
-40
C to +100
C
Input Diode Pair
Reverse Voltage
6 V
Average Forward Current
50 mA
Peak Forward Current (1
s pulse)
3 A
Power Dissipation (Note 2)
200 mW
Phototransistor (each)
Collector-Emitter Voltage
30 V
Emitter-Collector Voltage
5 V
Power Dissipation (Note 3)
100 mW
Dimensions in mm (-/+ 0.12)
Optical Centerline
8.0
16.5
11.4
3.0
6.35
Ch. 1
Ch. 2
CL
CL
CL
CL
34.8
3.0
6.6
3.8 (2 PL)
13.2
16.0
5.1
Gray
Blk (Gnd)
Green
Sensor output
(Ch. 1)
White
Sensor output
(Ch. 2)
Schematic
Electrical Characteristics
(T
A
=25
C unless otherwise noted)
Symbol
Parameter
Min Typ
Max
Units
Test Conditions
Input Diode
V
F
Forward Voltage
2.4
3.4
V
I
F
= 40 mA
I
R
Reverse Current
100
A
V
R
= 4 V
Output Phototransistor
I
CEO
Collector Dark Current
100
nA
V
CE
= 10V, Ee = 0, I
F
= 0
BV
CEO
Collector-Emitter Breakdown Voltage
30
V
I
C
= 100
A, Ee = 0
BV
ECO
Emitter-Collector Breakdown Voltage
5
V
I
C
= 100
A, Ee = 0
Coupled
V
CE(SAT)
Collector Emitter Saturation Voltage
0.4
V
I
C
= 250
A, I
F
= 25 mA
I
C(ON)
On-State Collector Current
400
A
V
CE
= 10V, I
F
= 25 mA
I
CX
Cross talk
200
A
I
F
= 25 mA, V
CE
= 2.0 V
Specifications subject to change without notice
103327 REV 1
Notes: (1) Plastic housing is soluble in chlorinated hydrocarbons and ketones. Recommended cleaning agents
are methanol or isopropanol.
(2) Derate linearly 2.6 mW/
C above 25
C.
(3) Derate linearly 1.3 mW/
C above 25
C.
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