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 l Optical encoders l Optical switches Uses low cost lens ■ 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 Condition Pulse width=10 µs Duty ratio=1 % P Topr Tstg Value 5 80 0.67 Unit V mA mA/°C 0.5 A 4.2 150 -30 to +85 -40 to +100 mA/°C mW °C °C ■ Electrical and optical characteristics (Ta=25 °C) Parameter Symbol Condition Min. Typ. Max. Unit Peak emission wavelength IF=30 mA 840 870 900 nm λp Spectral half width IF=30 mA 45 nm ∆λ 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 µA 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: φ8 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 ■ Emission spectrum (Typ. Ta=25 ˚C) 100 6 90 OPTICAL OUTPUT (mW) 60 40 20 FORWARD CURRENT (mA) 5 80 4 3 2 1 80 70 60 50 40 30 20 10 0 0 800 900 1000 0 20 40 60 KLEDB0218EA ■ Directivity 0˚ 10˚ 20˚ 30˚ RELATIVE RADIANT OUTPUT (dB) 30˚ 80 % 60 % 40˚ 50˚ 40˚ 50˚ 40 % 60˚ 60˚ 20 % 70˚ 70˚ 80˚ 80˚ 90˚ 90˚ KLEDB0227EB (Typ.) 0 -1 -2 -3 0 20 40 60 80 100 AMBIENT TEMPERATURE (˚C) 100 80 60 40 20 0 -40 -20 0 20 40 60 80 100 AMBIENT TEMPERATURE (˚C) KLEDB0247EA KLEDB0228EA KLEDB0229EB ■ Dimensional outline (unit: mm) ■ Light intensity distribution (Typ. Ta=25 ˚C) 10000 2.0 ■ Allowable forward current vs. ambient temperature +1 RELATIVE RADIANT OUTPUT (%) ■ Allowable forward current vs. duty ratio 1.5 (Typ. IF=50 mA) +2 100 % 1.0 KLEDB0300EB ■ Radiant output vs. ambient temperature (Typ. Ta=25 ˚C) 10˚ 0.5 FORWARD VOLTAGE (V) FORWARD CURRENT (mA) WAVELENGTH (nm) 20˚ 0 100 80 RELATIVE ALLOWABLE FORWARD CURRENT (%) 0 700 5.4 ± 0.2 (Typ. Ta=25 ˚C) 100 4.65 ± 0.15 PULSE WIDTH=10 µs 100 10 0.01 PULSE WIDTH=100 µs 3.7 ± 0.2 (0.4) 1000 L=15 mm L=25 mm 60 0.6 MAX. PULSE WIDTH=1 µs 80 40 13.5 ± 1.0 4.7 ± 0.3 L=10 mm RELATIVE RADIANT OUTPUT (%) ALLOWABLE FORWARD CURRENT (mA) ■ Forward current vs. forward voltage (Typ. Ta=25 ˚C) (Typ. Ta=25 ˚C, IF=30 mA) 100 RELATIVE RADIANT OUTPUT (%) ■ Optical output vs. forward current L8957 0.45 LEAD 20 IMAGE SENSOR LED L 2.54 ± 0.2 0 0.1 1 10 100 DUTY RATIO (%) -4 -3 -2 -1 0 1 2 3 4 POSITION ON IMAGE SENSOR (mm) KLEDB0288EA KLEDB0248EB COMMON TO CASE 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. ©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: Smidesvägen 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