LED Infrared LED L2791 series Small emission spot LED using current confined chip L2791 is infrared LED with a microball lens cemented to the current confined chip surface. This combination ensures high directivity and improved emission uniformity. In particular, L2791-02 uses a lens cap that delivers even narrower directivity. As a variant type not using a microball lens, L2791-03 is also available with the LED chip potted with resin, which gives a small emission spot of φ160 µm. Features Applications l Small emission spot l Automatic control systems l Optical switches l Auto-focus L2791 : φ400 µm L2791-03: φ160 µm l Uniform emission: L2791/-02 l Narrow directivity: L2791/-02 ■ Absolute maximum ratings (Ta=25 °C) Parameter Forward current Reverse voltage Symbol IF VR Pulse forward current IFP O p era ting te m pe ratu re Storage temperature Topr Tstg Condition Value 80 3 Unit mA V 0.5 A -30 to +85 -40 to +100 * °C °C Pulse width=10 µs Duty ratio=1 % * L2791-03 is guaranteed to resist temperature cycle test of up to 5 cycles. ■ Electrical and optical characteristics (Ta=25 °C) Condition L2791 Typ. Max. L2791-02 Typ. Max. L2791-03 Typ. Max. Parameter Symbol Peak emission wavelength Spectral half width Forward voltage Pulse forward voltage Reverse current Radiant flux Radiant illuminance Rise time Fall time λp IF=50 mA 850 880 910 850 880 910 850 880 910 nm ∆λ VF VFP IR φe PE tr tf IF=50 mA IF=50 mA IF=0.5 A VR=3 V IF=50 mA IF=50 mA IF=50 mA, 10 to 90 % IF=50 mA, 90 to 10 % 1.6 - 60 1.5 3.2 2.0 1.3 0.12 0.12 1.7 4.0 10 0.2 0.2 1.6 - 60 1.5 3.2 2.0 2.0 0.12 0.12 1.7 4.0 10 0.2 0.2 4.0 - 60 1.5 3.2 5.0 0.12 0.12 1.7 4.0 10 0.2 0.2 nm V V µA mW mW/cm2 µs µs Min. Min. Min. Unit 1 L2791 series Infrared LED ■ Emission spectrum ■ Radiant flux vs. forward current (Typ. Ta=25 ˚C, IF=50 mA) (Typ. Ta=25 ˚C, tw=100 µs, 0.1 %) 100 L2791-03 80 RADIANT FLUX (mW) RELATIVE RADIANT OUTPUT (%) 100 60 40 10 1 L2791, L2791-02 20 0 700 800 900 0.1 1000 1 100 10 WAVELENGTH (nm) 1000 FORWARD CURRENT (mA) KLEDB0158EA ■ Forward current vs. forward voltage KLEDB0159EA ■ Directivity (Typ. Ta=25 ˚C, tw=100 µs, 1 %) 1000 20˚ 10˚ 0˚ 10˚ (Typ. Ta=25 ˚C) 20˚ 30˚ 30˚ 40˚ FORWARD CURRENT (mA) 40˚ 50˚ 50˚ 60˚ 60˚ 100 L2791-02 70˚ L2791 80˚ 70˚ 80˚ L2791-03 * 90˚ 100 80 10 60 40 20 0 20 40 60 90˚ 80 100 RELATIVE RADIANT OUTPUT (%) * L2791-03: Except for reflection ingredient of the base. 1 1.0 1.5 2.0 2.5 3.0 3.5 FORWARD VOLTAGE (V) KLEDB0160EA ■ Radiant output vs. ambient temperature (Typ.) RELATIVE ALLOWABLE FORWARD CURRENT (%) RELATIVE RADIANT OUTPUT (dB) ■ Allowable forward current vs. ambient temperature (Typ. IF=50 mA) +1 0 -1 -2 -3 -40 -20 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) KLEDB0162EA 2 KLEDB0161EA KLEDB0027EB Infrared LED L2791 series ■ Allowable forward current vs. duty ratio (Typ. Ta=25 ˚C) ALLOWABLE FORWARD CURRENT (mA) 10000 PULSE WIDTH=1 µs 1000 PULSE WIDTH=10 µs PULSE WIDTH=100 µs 100 10 0.01 0.1 1 10 100 DUTY RATIO (%) KLEDB0288EA ■ Dimensional outlines (unit: mm) ➁ L2791-02 ➂ L2791-03 0.45 LEAD 0.45 LEAD 2.54 ± 0.2 2.3 ± 0.3 4.2 ± 0.1 13.5 0.45 LEAD 13.5 13.5 4.5 ± 0.2 GLASS WINDOW 3.0 ± 0.1 5.4 ± 0.1 CLEAR EPOXY RESIN 1.12 ± 0.1 5.4 ± 0.2 4.65 ± 0.1 3.6 ± 0.2 5.4 ± 0.2 4.7 ± 0.1 6.65 ± 0.2 ➀ L2791 2.54 ± 0.2 2.54 ± 0.2 COMMON TO CASE COMMON TO CASE COMMON TO CASE KLEDA0060EA KLEDA0059EA KLEDA0058EA 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 Cat. No. KLED1021E02 Jun. 2006 DN 3