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
s
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
V
R
Max.
I
F
-
I
FP
-
P
Topr
Tstg
Condition
Value
1
80
1.1
1.0
13
150
-30 to +85
-40 to +100 *
1
Unit
V
mA
mA/°C
A
mA/°C
mW
°C
°C
Pulse width=10 µs
Duty ratio=1 %
*1: Guaranteed to resist temperature cycle test of up to 5 cycles.
s
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
V
F
I
R
fc
Condition
I
F
=50 mA
I
F
=50 mA
I
F
=50 mA
I
F
=50 mA
V
R
=1 V
I
F
=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
s
Emission spectrum
100
(Typ. Ta=25 ˚C, I
F
=50 mA)
20˚
10˚
0˚
100
%
L8245
s
Directivity
(Typ. Ta=25 ˚C)
10˚
20˚
RELATIVE RADIANT OUTPUT (%)
80
30˚
80
%
30˚
60
40˚
60
%
40˚
40
50˚
60˚
70˚
20 %
40
%
50˚
60˚
70˚
80˚
90˚
20
0
1.2
80˚
1.4
1.6
1.8
2.0
90˚
WAVELENGTH (µm)
KLEDB0222EA
RELATIVE RADIANT OUTPUT (%)
KLEDB0223EA
s
Radiant output vs. ambient temperature
+3
+2
+1
0
-1
-2
-3
-4
-5
-40
(Typ. I
F
=50 mA)
s
Allowable forward current vs. ambient temperature
(Typ.)
RELATIVE ALLOWABLE FORWARD CURRENT (%)
100
RELATIVE RADIANT OUTPUT (dB)
80
60
40
20
-20
0
20
40
60
80
100
0
-40
-20
0
20
40
60
80
100
AMBIENT TEMPERATURE (˚C)
KLEDB0224EA
AMBIENT TEMPERATURE (˚C)
KLEDB0027EB
s
Allowable forward current vs. duty ratio
10
(Typ. Ta=25 ˚C)
s
Dimensional outline (unit: mm)
5.4 ± 0.2
4.7 ± 0.1
GLASS WINDOW
3.0 ± 0.1
ALLOWABLE FORWARD CURRENT (A)
PULSE WIDTH=1 µs
1
PULSE WIDTH=10 µs
0.1
0.45
LEAD
2.54 ± 0.2
0.01
0.01
0.1
1
10
100
DUTY RATIO (%)
KLEDB0225EA
COMMON TO CASE
13.5
PULSE WIDTH=100 µs
3.6 ± 0.2
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. ©2002 Hamamatsu Photonics K.K.
HAMAMATSU PHOTONICS K.K., Solid State Division
1126-1 Ichino-cho, Hamamatsu City, 435-8558 Japan, Telephone: (81) 053-434-3311, Fax: (81) 053-434-5184, http://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.: 8, 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. KLED1034E01
Jan. 2002 DN
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