L9437 is an infrared led developed for optical encoders. by improving the aspherical lens used with the previous type l8506, we have achieved an even more highly collimated beam of near infrared light. the lead pin of L9437 has no step piece that is usually formed at t he lead base brazed to the package, thus eliminating the restriction in printed circuit board design. features l collimated light beam l uniform light spot l narrow directivity: ?? l high-speed response: 40 mhz typ. l high reliability applications l optical encoder led infrared led led emitting collimated light for optical encoder L9437 1 absolute maximum ratings (ta=25 c, unless otherwise noted) parameter symbol condition value unit reverse voltage v r 5 v forward current i f 80 ma forward current reduction rate - 0.67 ma/c pulse forward current i fp pulse width=10 s duty ratio=1 % 0.5 a pulse forward current reduction rate - 4.2 ma/c power dissipation p 150 mw operating temperature topr -30 to +85 c storage temperature tstg -40 to +100 c electrical and optical characteristics (ta=25 c) parameter symbol condition min. typ. max. unit peak emission wavelength p i f =30 ma 840 870 900 nm spectral half width ? i f =30 ma - 45 - nm optical output * 1 pe i f =30 ma 1.25 1.6 - mw forward voltage v f i f =30 ma - 1.5 1.65 v reverse current i r v r =5 v - - 5 a light spot size * 2 bw i f =30 ma 4.0 * 3 4.3 - mm cut-off frequency * 4 fc i f =30 ma 4 map-p 25 40 - mhz *1: measured with a photodiode (active area: 8 mm) installed 25 mm away from led stem undersurface. *2: full width at half maximum of beam spot measured with an image sensor installed 13 mm away from led stem undersurface. *3: reference value *4: frequency at which the optical output drops by -3 db from that at 100 khz. ?
infrared led L9437 hamamatsu photonics k.k., solid state division 1126-1 ichino-cho, higashi-ku, hamamatsu city, 435-8558 japan, telephone: (81) 53-434-3311, fax: (81) 53-434-5184, www.hamamats u.com u.s.a.: hamamatsu corporation: 360 foothill road, p.o.box 6910, bridgewater, n.j. 08807-0910, u.s.a., telephone: (1) 908-231-0 960, fax: (1) 908-231-1218 germany: hamamatsu photonics deutschland gmbh: arzbergerstr. 10, d-82211 herrsching am ammersee, germany, telephone: (49) 08152 -3750, fax: (49) 08152-2658 france: hamamatsu photonics france s.a.r.l.: 19, rue du saule trapu, parc du moulin de massy, 91882 massy cedex, france, teleph one: 33-(1) 69 53 71 00, fax: 33-(1) 69 53 71 10 united kingdom: hamamatsu photonics uk limited: 2 howard court, 10 tewin road, welwyn garden city, hertfordshire al7 1bw, unit ed kingdom, telephone: (44) 1707-294888, fax: (44) 1707-325777 north europe: hamamatsu photonics norden ab: smidesv ? gen 12, se-171 41 solna, sweden, telephone: (46) 8-509-031-00, fax: (46) 8-509-031-01 italy: hamamatsu photonics italia s.r.l.: strada della moia, 1/e, 20020 arese, (milano), italy, telephone: (39) 02-935-81-733, fax: (39) 02-935-81-741 information furnished by hamamatsu is believed to be reliable. however, no responsibility is assumed for possible inaccuracies or omissions. specifications are subject to change without notice. no patent rights are granted to any of the circuits described herein. ?200 7 hamamatsu photonics k.k. cat. no. kled1045e03 aug. 2007 dn 2 emission spectrum optical output vs. forward current radiant output vs. ambient temperature directivity kledb0303ea kledb0226ea kledb0227eb kledb0218ea forward current vs. forward voltage kledb0228ea allowable forward current vs. ambient temperature kledb0229eb kleda0082ea kledb0288ea allowable forward current vs. duty ratio light intensity distribution kledb0263eb dimensional outline (unit: mm) 4.65 0.15 3.7 0.2 5.3 0.3 13.5 1.0 5.4 0.2 (0.4) 0.1 max. 2.54 0.2 0.45 0.05 lead common to case relative radiant output (%) (typ. ta=25 ? c) 80 % 40 % 60 % 20 % 20 ? 10 ? 0 ? 10 ? 20 ? 90 ? 80 ? 50 ? 40 ? 30 ? 70 ? 60 ? 90 ? 80 ? 50 ? 40 ? 30 ? 70 ? 60 ? 100 % 0 20 40 60 80 100 -3 -2 0 -1 +1 +2 ambient temperature ( ? c) relative radiant output (db) (typ. i f =50 ma) -40 -20 0 20 (typ.) 40 60 80 100 0 40 60 80 100 ambient temperature ( ? c) relative allowable forward current (%) 20 0 0.5 1.0 1.5 2.0 40 20 60 80 100 30 10 0 50 70 90 forward voltage (v) forward current (ma) (typ. ta=25 ? c) position on image sensor (mm) relative radiant output (%) 0 -5 -4 -3 -2 -1 0 1 3 4 25 20 40 60 80 100 image sensor (typ. ta=25 ? c) l led l =10 mm l =15 mm l =25 mm 700 800 900 1000 0 40 20 60 80 100 wavelength (nm) relative radiant output (%) (typ. ta=25 ? c, i f =30 ma) forward current (ma) optical output (mw) (typ. ta=25 ? c) 0 20406080 0 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 100 duty ratio (%) allowable forward current (ma) 0.01 0.1 1 10 100 10 100 1000 10000 (typ. ta=25 ? c) pulse width=1 s pulse width=100 s pulse width=10 s
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