Features
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Small emission spot
L2791 : φ400 µm
L2791-03: φ160 µm
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Uniform emission: L2791/-02
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Narrow directivity: L2791/-02
Applications
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Automatic control systems
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Optical switches
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Auto-focus
LED
Infrared LED
Small emission spot LED using current confined chip
L2791 series
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.
■ Absolute maximum ratings (Ta=25 °C)
Parameter Symbol Condition Value Unit
Forward current IF80 mA
Reverse voltage VR3 V
Pulse forward current IFP Pulse width=10 µs
Duty ratio=1 % 0.5 A
Operating temperature
Topr -30 to +85 °C
Storage temperature Tstg -40 to +100 * °C
* L2791-03 is guaranteed to resist temperature cycle test of up to 5 cycles.
■ Electrical and optical characteristics (Ta=25 °C)
L2791 L2791-02 L2791-03
Parameter Symbol Condition Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit
Peak emission
wavelength λpIF=50 mA 850 880 910 850 880 910 850 880 910 nm
Spectral half width ∆λ IF=50 mA -60 - - 60 - - 60 -nm
Forward voltage VFIF=50 mA - 1.5 1.7 - 1.5 1.7 - 1.5 1.7 V
Pulse forward voltage VFP IF=0.5 A -3.2 4.0 -3.2 4.0 -3.2 4.0 V
Reverse current IRVR=3 V - -10- -10- -10 µA
Radiant flux φeIF=50 mA 1.6 2.0 -1.6 2.0 -4.0 5.0 -mW
Radiant illuminance PEIF=50 mA -1.3--2.0----mW/cm
2
Rise time tr IF=50 mA, 10 to 90 % -0.12 0.2 -0.12 0.2 -0.12 0.2 µs
Fall time tf IF=50 mA, 90 to 10 % - 0.12 0.2 - 0.12 0.2 - 0.12 0.2 µs
1
Infrared LED
L2791 series
2
FORWARD CURRENT (mA)
(Typ. Ta=25 ˚C, tw=100 µs, 0.1 %)
RADIANT FLUX (mW)
101
0.1
1
100
10
100 1000
L2791-03
L2791, L2791-02
■ Emission spectrum
KLEDB0158EA
■ Radiant flux vs. forward current
KLEDB0159EA
700 800 900 1000
0
40
20
60
80
100
WAVELENGTH (nm)
RELATIVE RADIANT OUTPUT (%)
(Typ. Ta=25 ˚C, IF=50 mA)
90˚
80˚
70˚
60˚
50˚40˚30˚
90˚
80˚
70˚
60˚
50˚
40˚
30˚
20˚10˚0˚10˚20˚
* L2791-03: Except for reflection ingredient of the base.
020406080100 20 40 60 80 100
RELATIVE RADIANT OUTPUT (%)
(Typ. Ta=25 ˚C)
L2791
L2791-03 *
L2791-02
■ Forward current vs. forward voltage
KLEDB0160EA
■ Directivity
KLEDB0161EA
1.0 1.5 2.0 2.5 3.0 3.5
1
10
1000
100
FORWARD VOLTAGE (V)
FORWARD CURRENT (mA)
(Typ. Ta=25 ˚C, tw=100 µs, 1 %)
-40 -20 0 20
(Typ.)
40 60 80 100
0
40
60
80
100
AMBIENT TEMPERATURE (˚C)
RELATIVE ALLOWABLE FORWARD CURRENT (%)
20
■ Radiant output vs. ambient temperature
KLEDB0162EA
■ Allowable forward current vs. ambient temperature
KLEDB0027EB
-40 -20 0 20 40 60 80 100
-3
-2
0
-1
+1
AMBIENT TEMPERATURE (˚C)
RELATIVE RADIANT OUTPUT (dB)
(Typ. IF=50 mA)
Infrared LED
L2791 series
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
Information furnished by HAMAMATSU is believed to be reliable. However, no responsibility is assumed for possible inaccur acies 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.
Cat. No. KLED1021E02
Jun. 2006 DN 3
■ Dimensional outlines (unit: mm)
■ Allowable forward current vs. duty ratio
KLEDB0288EA
DUTY RATIO (%)
ALLOWABLE FORWARD CURRENT (mA)
0.01 0.1 1 10 100
10
100
1000
10000 (Typ. Ta=25 ˚C)
PULSE WIDTH=1 µs
PULSE WIDTH=100 µs
PULSE WIDTH=10 µs
1.12 ± 0.1
CLEAR EPOXY RESIN
5.4 ± 0.1
4.2 ± 0.1
0.45
LEAD
2.54 ± 0.2
2.3 ± 0.3
13.5
COMMON TO CASE
4.65 ± 0.1
4.5 ± 0.2
6.65 ± 0.213.5
5.4 ± 0.2
2.54 ± 0.2
COMMON TO CASE
0.45
LEAD
5.4 ± 0.2
4.7 ± 0.1
GLASS WINDOW
3.0 ± 0.1
3.6 ± 0.2
13.5
2.54 ± 0.2
COMMON TO CASE
0.45
LEAD
KLEDA0058EAKLEDA0059EAKLEDA0060EA
➂ L2791-03➁ L2791-02➀ L2791
