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
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Peak emission wavelength: 1.65 µm
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High radiant output
Applications
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Light source for methane gas detection
LED
Infrared LED
Peak emission wavelength: 1.65 µm
L8245
■ Absolute maximum ratings (Ta=25 °C, unless otherwise noted)
Parameter Symbol Condition Value Unit
Reverse voltage VR Max. 1 V
Forward current IF80 mA
Forward current decrease rate - 1.1 mA/°C
Pulse forward current IFP Pulse width=10 µs
Duty ratio=1 % 1.0 A
Pulse forward current decrease rate - 13 mA/°C
Power dissipation P150 mW
Operating temperature Topr -30 to +85 °C
Storage temperature Tstg -40 to +100 *1°C
*1: Guaranteed to resist temperature cycle test of up to 5 cycles.
■ Electrical and optical characteristics (Ta=25 °C)
Parameter Symbol Condition Min. Typ. Max. Unit
Peak emission wavelength λpIF=50 mA 1.6 1.65 1.7 µm
Spectral half width ∆λ IF=50 mA -130 -nm
Radiant flux φeIF=50 mA 0.5 0.8 - mW
Forward voltage VFIF=50 mA -1.0 1.5 V
Reverse current IRVR=1 V - - 10 µA
Cut-off frequency fc IF=50 mA±10 mAp-p, *21 3 - MHz
*2: Frequency at which the optical output decreases by -3 dB versus a reference output level at 100 kHz.
1
L8245 may be damaged or perfor mance may deteriorate due to static electricity, so use caution when handling.
Infrared LED
L8245
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 . Ho w ever, no responsibility is assumed f or 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.
Cat. No. KLED1034E02
Jun. 2006 DN
2
■ Allowable forward current vs. duty ratio
■ Emission spectrum ■ Radiant flux vs. forward current
■ Radiant output vs. ambient
temperature
■ Directivity
KLEDB0298EA
KLEDB0223EA
KLEDB0299EA
KLEDB0222EA
■ Forward current vs. forward voltage
KLEDB0224EA
■ Allowable forward current vs. ambient
temperature
KLEDB0027EB
■ Dimensional outline (unit: mm)
KLEDA0071EA
KLEDB0225EA
5.4 ± 0.2
4.7 ± 0.1
GLASS WINDOW
3.0 ± 0.1
3.6 ± 0.2
13.5 ± 1.0
2.54 ± 0.2
0.45
LEAD
COMMON TO CASE
1.2 1.4 1.6 1.8 2.0
0
40
20
60
80
100
WAVELENGTH (µm)
RELATIVE RADIANT OUTPUT (%)
(Typ. Ta=25 ˚C, IF=50 mA)
RELATIVE RADIANT OUTPUT (%)
(Typ. Ta=25 ˚C)
80 %
40 %
60 %
20 %
20˚10˚0˚10˚20˚
90˚
80˚
50˚
40˚
30˚
70˚
60˚
90˚
80˚
50˚
40˚
30˚
70˚
60˚
100
%
-40 -20 0 20 40 60 80 100
-5
-4
-2
0
-3
-1
+1
+2
+3
AMBIENT TEMPERATURE (˚C)
RELATIVE RADIANT OUTPUT (dB)
(Typ. IF=50 mA)
-40 -20 0 20
(Typ.)
40 60 80 100
0
40
60
80
100
AMBIENT TEMPERATURE (˚C)
RELATIVE ALLOWABLE FORWARD CURRENT (%)
20
0.01
DUTY RATIO (%)
ALLOWABLE FORWARD CURRENT (mA)
10 0.1 1 10 100
100
1000
10000
PULSE WIDTH=1 µs
(Typ.
Ta=25
˚C)
PULSE WIDTH=100 µs
PULSE WIDTH=10 µs
FORWARD CURRENT (mA)
(Typ. Ta=25 ˚C, tw=100 µs, 0.1 %)
RADIANT FLUX (mW)
10 100
0
100
10
1
1000
FORWARD VOLTAGE (V)
(Typ. Ta=25 ˚C, tw=100 µs, 0.1 %)
FORWARD CURRENT (mA)
0.5 1.51.0 2.0
10
1000
100
2.5
