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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 Input Diode Reverse Voltage Continuous Forward Current Peak Forward Current (1s pulse) Power Dissipation (1) Phototransistor Collector-Emitter Voltage Emitter-Collector Voltage Power Dissipation (1) -40C to +85C 3V 50 mA 3A 100 mW 30 V 5V 100 mW 7.6 3.8 14.5 6.3 Dimensions in mm. (-/+ 0.12) 15.5 3.8 3.4 Optical center-line 9.0 18.3 11.7 18.3 Wires are omitted for clarity Wire 3.3 Brown Red Black Schematic Notes: (1) Derate linearly 1.33 mW/C above 25C. (2) Plastic housing is soluble in chlorinated hydrocarbons and ketones. Recommended cleaning agents are methanol or isopropanol. Electrical Characteristics (TA=25C unless otherwise noted) Symbol Parameter Min Typ Max Input Diode VF Forward Voltage 1.2 1.7 IR Reverse Current 10 Output Phototransistor ICEO Collector Dark Current 100 BVCEO Collector-Emitter Breakdown Voltage 30 BVECO Emitter-Collector Breakdown Voltage 5 Coupled VCE(SAT) Collector Emitter Saturation Voltage 0.4 IC(ON) On-State Collector Current 1.5 Specifications subject to change without notice Units V A nA V V V mA Test Conditions IF = 20 mA VR = 3 V VCE=10V, Ee=0 IC=100A, Ee=0 IC=100A, Ee=0 IC=100A, IF = 20 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 The Old Railway, Princes Street Ulverston, Cumbria, LA12 7NQ, UK Tel: 01 229 581 551 Fax: 01 229 581 554 |
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