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| LED Infrared LED L8957 Low cost LED ideal for optical encoders L8957 is an infrared LED using a low-cost lens and available at a lower price than other products up to now. Features Applications l Low price Uses low cost lens l Optical encoders l Optical switches s Absolute maximum ratings (Ta=25 C, unless otherwise noted) Parameter Reverse voltage Forward current Forward current reduction rate Pulse forward current Pulse forward current reduction rate Power dissipation Operating temperature Storage temperature Symbol VR IF IFP P Topr Tstg Condition Value 5 80 0.67 0.5 4.2 150 -30 to +85 -40 to +100 Unit V mA mA/C A mA/C mW C C Pulse width=10 s Duty ratio=1 % s Electrical and optical characteristics (Ta=25 C) Parameter Symbol Condition Min. Typ. Max. Unit Peak emission wavelength IF=30 mA 840 870 900 nm p Spectral half width IF=30 mA 45 nm Optical output *1 Pe IF=30 mA 1.5 2.1 mW Forward voltage VF IF=30 mA 1.5 1.65 V Reverse current IR VR=5 V 5 A Spot light size *2 Bw IF=30 mA 4.8 *3 5.4 mm 4 Cut-off frequency * fc IF=30 mA 4 mAp-p 25 40 MHz *1: Measured with a photodiode (active area: 8 mm) installed 10 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. 1 Infrared LED s Emission spectrum 100 (Typ. Ta=25 C, IF=30 mA) L8957 (Typ. Ta=25 C) s Optical output vs. forward current (Typ. Ta=25 C) 6 s Forward current vs. forward voltage 100 90 RELATIVE RADIANT OUTPUT (%) FORWARD CURRENT (mA) OPTICAL OUTPUT (mW) 80 5 80 70 60 50 40 30 20 10 4 60 3 40 2 20 1 0 700 0 0 0 20 40 60 80 100 0 0.5 1.0 1.5 2.0 800 900 1000 WAVELENGTH (nm) KLEDB0218EA FORWARD CURRENT (mA) KLEDB0300EB FORWARD VOLTAGE (V) KLEDB0227EB s Directivity (Typ. Ta=25 C) 20 10 0 100 % 10 20 s Radiant output vs. ambient temperature +2 30 s Allowable forward current vs. ambient temperature (Typ.) (Typ. IF=50 mA) RELATIVE ALLOWABLE FORWARD CURRENT (%) 80 % RELATIVE RADIANT OUTPUT (dB) 30 100 +1 80 40 60 % 40 0 60 50 60 70 80 90 40 % 50 60 -1 40 20 % 70 80 90 -2 20 -3 0 20 40 60 80 100 0 -40 -20 0 20 40 60 80 100 RELATIVE RADIANT OUTPUT (%) KLEDB0247EA AMBIENT TEMPERATURE (C) KLEDB0228EA AMBIENT TEMPERATURE (C) KLEDB0229EB s Allowable forward current vs. duty ratio 10000 (Typ. Ta=25 C) s Light intensity distribution 100 L=10 mm (Typ. Ta=25 C) s Dimensional outline (unit: mm) 5.4 0.2 4.65 0.15 ALLOWABLE FORWARD CURRENT (mA) RELATIVE RADIANT OUTPUT (%) 1000 PULSE WIDTH=1 s PULSE WIDTH=10 s 40 100 PULSE WIDTH=100 s 0.45 LEAD IMAGE SENSOR 20 0.6 MAX. 60 L=25 mm LED L 2.54 0.2 10 0.01 0 0.1 1 10 100 -4 -3 -2 -1 0 1 2 3 4 DUTY RATIO (%) KLEDB0288EA POSITION ON IMAGE SENSOR (mm) KLEDB0248EB COMMON TO CASE 3.7 0.2 80 13.5 1.0 4.7 0.3 L=15 mm (0.4) KLEDA0077EA 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. (c)2007 Hamamatsu Photonics K.K. 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.hamamatsu.com U.S.A.: Hamamatsu Corporation: 360 Foothill Road, P.O.Box 6910, Bridgewater, N.J. 08807-0910, U.S.A., Telephone: (1) 908-231-0960, 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, Telephone: 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, United Kingdom, Telephone: (44) 1707-294888, Fax: (44) 1707-325777 North Europe: Hamamatsu Photonics Norden AB: Smidesvagen 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 2 Cat. No. KLED1039E03 Aug. 2007 DN |
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