photointerrupter(transimissive) dimensions (unit : mm) the SG278 photointerrupter high-performance standard type,combines high-output gaas ired with high sensitive phototransistor. features ? pwb direct mount type ? gap : 3.0mm ? compact/high performance ? with the installation positioning boss applications ? printers ? facsimiles ? car stereo ? card readers/writers maximum ratings (ta=25 c) symbol rating unit power dissipation p d 75 mw forward current i f 50 ma reverse voltage v r 5v pulse forward current *1 i fp 1a collector power dissipation p c 75 mw collector current i c 20 ma collector-emitter voltage v ceo 30 v emitter-collector voltage v eco 5v topr. -20 ~ +85 c tstg. -30 ~ +85 c tsol. 260 c *1. pulse width : tw 100us. period t=10ms *2. no icebound or dew *3. for max. 5 seconds at the position of 1mm from the resin edge. electro-optical characteristics (ta=25 c) symbol min. typ. max. unit. forward voltage v f - 1.2 1.4 v reverse current i r - - 10 a peak wavelength p - 940 - nm output collector dark current i ceo - 1 100 na light current i c 0.7 - 14 ma leakage current i ceod - 0.5 10 a c-e saturation voltage v ce(sat) - 0.15 0.4 v tr - 4 - s tf - 5 - s i f =20ma,i c =0.1ma storage temp. *2 SG278 input trans- mission item item input output operating temp. *2 conditions i f =20ma,v ce =5v (shading) v cc =5v,i c =2ma,r l =100 ? soldering temp. *3 rise time fall time i f =20ma v r =5v i f =20ma v ce =10v,0 lx i f =20ma,v ce =5v (non-shading) - 1 -
photointerrupter(transimissive) SG278 collector power dissipation vs. ambient temperature forward current vs. forward voltage light current vs. forward current light current vs. collector-emitter voltage relative light current vs. ambient temperature dark current vs. ambient temperature switching time vs. load resistance 1 relative light current vs. moving distance 2 light current i l collector power dissipation p c ambient temperature ta forward current i f forward voltage v f light current i l forward current i f light current i l collector-emtter voltage v ce relative light current i l ambient temperature ta dark current i ceo ambient temperature ta switching time tr,tf collector-emtter voltage v ce relative light current i l moving distanve l - 2 -
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