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STS-8857 Datasheet

Transmissive Switch Assembly

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STS-8857 pdf
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STS-8857
Transmissive Switch Assembly
Features
Non contact switching
Three wires for electrical connection
Fast switching speed
Description
The STS-8857 consists of an infrared emitting diode
and an NPN silicon phototransistor mounted on
opposite sides of a 3.8 mm wide slot. Phototransistor
switching takes place whenever an opaque object
passes through the slot. The polysulfone housing (2)
reduces interference from ambient light and provides
dirt and dust protection. The 40 cm minimum length
wires simplify the connection to the PC board.
Absolute Maximum Ratings
Operating & Storage Temperature
-40°C to +85°C
Input Diode
Reverse Voltage
Continuous Forward Current
Peak Forward Current (1µs pulse)
Power Dissipation (1)
3V
50 mA
3A
100 mW
Phototransistor
Collector-Emitter Voltage
Emitter-Collector Voltage
Power Dissipation (1)
30 V
5V
100 mW
7.6
6.3
15.5
3.8
18.3
Dimensions in mm. (-/+ 0.12)
3.8
14.5
Optical center-line
3.4
9.0 11.7
18.3
Wires are omitted
for clarity
Wire
3.3
Brown
Red
Schematic
Black
Notes:
(1) Derate linearly 1.33 mW/°C above 25°C.
(2) Plastic housing is soluble in chlorinated
hydrocarbons and ketones. Recommended
cleaning agents are methanol or isopropanol.
Electrical Characteristics (TA=25°C unless otherwise noted)
Symbol
Parameter
Min Typ
Input Diode
VF Forward Voltage
1.2
IR Reverse Current
Output Phototransistor
ICEO Collector Dark Current
BVCEO Collector-Emitter Breakdown Voltage 30
BVECO Emitter-Collector Breakdown Voltage 5
Coupled
VCE(SAT) Collector Emitter Saturation Voltage
IC(ON) On-State Collector Current
1.5
Specifications subject to change without notice
Max
1.7
10
100
0.4
Units
Test Conditions
V IF = 20 mA
µA VR = 3 V
nA VCE=10V, Ee=0
V IC=100µA, Ee=0
V IC=100µA, Ee=0
V IC=100µA, IF = 20 mA
mA VCE =10V, IF = 20 mA
103057 REV 1
5200 St. Patrick St., Montreal
Que., H4E 4N9, Canada
Tel: 514-768-8000
Fax: 514-768-8889
QF-84
DataSheet4 U .com
The Old Railway, Princes Street
Ulverston, Cumbria, LA12 7NQ, UK
Tel: 01 229 581 551
Fax: 01 229 581 554


Part Number STS-8857
Description Transmissive Switch Assembly
Maker Silonex
Total Page 1 Pages
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