Reflective Photosensors (Photo Reflectors) ON2175 Reflective Photosensor Unit : mm (R2.3) 4.0±0.3 ø2.2±0.3 2-ø1.2±0.15 (4-R0.3) Outline ON2175 is a sensor which consists of a high efficiency GaAs infrared light emitting diode and a high sensitivity Si phototransistor which are arranged together in the same direction. It detects the beginning and end of a tape based on changes in the amount of light reflected from a prism which is situated outside of the sensor. 5.0 +0 –0.3 6.5±0.3 8.3±0.3 6.0±0.15 Tape end sensor for DAT Fast response Small size and light weight ,, , ,,,, Features 2-ø1.2±0.15 (C0.3) ø1.2 +0 –0.3 2-0.4±0.2 (3.75) 4 2 3 1 3.0±0.3 5.0 min. 8.3±0.3 1.0±0.3 4.0±0.3 (C0.2) 3.75±0.15 8.0 +0 –0.3 7.0±0.3 2-0.15 +0.2 –0.1 (3.75) Absolute Maximum Ratings (Ta = 25˚C) Parameter Symbol Ratings Reverse voltage (DC) Input (Light Forward current (DC) emitting diode) Power dissipation Unit VR 3 V IF 50 mA 75 mW IC 20 mA Output (Photo Collector to emitter voltage transistor) Emitter to collector voltage VCEO 30 V VECO 5 V Collector power dissipation PC*2 100 mW Operating ambient temperature Topr –25 to +85 ˚C Storage temperature Tstg –30 to +100 ˚C Collector current Temperature PD *1 1 2 3 4 Pin connection (Note) ( ) Dimension is reference Input power derating ratio is 1.0 mW/˚C at Ta ≥ 25˚C. *2 Output power derating ratio is 1.34 mW/˚C at Ta ≥ 25˚C. *1 Electrical Characteristics (Ta = 25˚C) Parameter Symbol Conditions min typ max Unit Forward voltage (DC) Input characteristics Reverse current (DC) VF IF = 50mA 1.5 V IR VR = 3V 10 µA Output characteristics Collector cutoff current ICEO VCE = 10V 0.2 µA IC*1 VCE = 5V, IF = 20mA, RL = 100Ω Collector current Transfer Response time tr , tf*2 VCC = 10V, IC = 0.5mA, RL = 100Ω characteristics Collector to emitter saturation voltage VCE(sat) IF = 50mA, IC = 0.1mA *1 I C *2 Measurement method (Unit : mm ) 2– 1.5 ON2175 µs 6 0.5 V Switching time measurement circuit VCC 2.5 1 (Input pulse) Sig.OUT ,, ,,,, ,,,,,,,,, ,,,,,, 1 Sig.IN µA 30 50Ω prism RL (Output pulse) 90% 10% td tr tf td : Delay time tr : Rise time (Time required for the collector current to increase from 10% to 90% of its final value) tf : Fall time (Time required for the collector current to decrease from 90% to 10% of its initial value) 1