LED Infrared LED L8245 Peak emission wavelength: 1.65 µm L8245 is a long-wavelength infrared LED using an InGaAs chip. The peak emission occurs at a wavelength near the methane gas absorption band, making L8245 ideal for a light source for methane gas detection. Features Applications l Peak emission wavelength: 1.65 µm l High radiant output l Light source for methane gas detection ■ Absolute maximum ratings (Ta=25 °C, unless otherwise noted) Parameter Reverse voltage Forward current Forward current decrease rate Pulse forward current Pulse forward current decrease rate Power dissipation Operating temperature Storage temperature Symbol VR Max. IF IFP Condition Pulse width=10 µs Duty ratio=1 % P Topr Tstg Value 1 80 1.1 Unit V mA mA/°C 1.0 A 13 150 -30 to +85 -40 to +100 *1 mA/°C mW °C °C *1: Guaranteed to resist temperature cycle test of up to 5 cycles. ■ Electrical and optical characteristics (Ta=25 °C) Parameter Peak emission wavelength Spectral half width Radiant flux Forward voltage Reverse current Cut-off frequency Symbol λp ∆λ φe VF IR fc Condition IF=50 mA IF=50 mA IF=50 mA IF=50 mA VR=1 V IF=50 mA±10 mAp-p, *2 Min. 1.6 0.5 1 Typ. 1.65 130 0.8 1.0 3 Max. 1.7 1.5 10 - Unit µm nm mW V µA MHz *2: Frequency at which the optical output decreases by -3 dB versus a reference output level at 100 kHz. L8245 may be damaged or performance may deteriorate due to static electricity, so use caution when handling. 1 Infrared LED ■ Emission spectrum (Typ. Ta=25 ˚C, IF=50 mA) 100 ■ Forward current vs. forward voltage (Typ. Ta=25 ˚C, tw=100 µs, 0.1 %) 40 FORWARD CURRENT (mA) 80 60 10 1 20 0 1.2 1.4 1.6 1.8 0 10 2.0 WAVELENGTH (µm) ■ Directivity 10˚ 20˚ 80 % 60 % 40˚ 50˚ 40˚ 50˚ 40 % 60˚ 60˚ 20 % 70˚ 70˚ 80˚ 80˚ 90˚ 90˚ ■ Allowable forward current vs. ambient temperature (Typ.) +2 +1 0 -1 -2 -3 -4 -5 -40 -20 0 20 40 60 80 KLEDB0223EA ■ Allowable forward current vs. duty ratio 80 60 40 20 100 0 -40 -20 0 20 40 60 80 100 AMBIENT TEMPERATURE (˚C) KLEDB0224EA KLEDB0027EB ■ Dimensional outline (unit: mm) (Typ. Ta=25 ˚C) 10000 100 AMBIENT TEMPERATURE (˚C) RELATIVE RADIANT OUTPUT (%) 5.4 ± 0.2 3.6 ± 0.2 4.7 ± 0.1 GLASS WINDOW 3.0 ± 0.1 PULSE WIDTH=1 µs PULSE WIDTH=10 µs 1000 PULSE WIDTH=100 µs 100 13.5 ± 1.0 ALLOWABLE FORWARD CURRENT (mA) RELATIVE RADIANT OUTPUT (dB) 30˚ 2.5 (Typ. IF=50 mA) +3 30˚ 2.0 KLEDB0299EA RELATIVE ALLOWABLE FORWARD CURRENT (%) 0˚ 100 % 1.5 KLEDB0298EA ■ Radiant output vs. ambient temperature (Typ. Ta=25 ˚C) 10˚ 1.0 FORWARD VOLTAGE (V) FORWARD CURRENT (mA) KLEDB0222EA 20˚ 100 10 0.5 1000 100 (Typ. Ta=25 ˚C, tw=100 µs, 0.1 %) 1000 100 RADIANT FLUX (mW) RELATIVE RADIANT OUTPUT (%) ■ Radiant flux vs. forward current L8245 0.45 LEAD 2.54 ± 0.2 10 0.01 0.1 1 10 100 DUTY RATIO (%) KLEDB0225EA COMMON TO CASE KLEDA0071EA 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. ©2006 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. KLED1034E02 Jun. 2006 DN