Features
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Peak emission wavelength: 1.45 µm
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High radiant output power
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Narrow directivity (L7850-01)
Applications
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Light source for moisture meter
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Light source for photosensitive material
LED
Infrared LED
Peak emission wavelength: 1.45 µm
L7850 series
L7850 series is a long wavelength LED using an InGaAs chip. Peak emission occurs at 1.45 µm, making L7850 series ideal for detection of water
content or moisture. L7850-01 has a glass lens window for narrow directivity (beam spread).
1
■ Absolute maximum ratings (Ta=25 °C, unless otherwise noted)
Parameter Symbol Condition Value Unit
Reverse voltage V41V
Forward current I.80 mA
Forward current derating
rate - Ta > 25 °C 1.1 mA/°C
Pulse forward current I.2 Pulse width=10 µs
Duty ratio=1 % 1.0 A
Pulse forward current
derating rate - Ta > 25 °C 13 mA/°C
Power dissipation P150 mW
Operating temperature Topr -30 to +85 °C
Storage temperature Tstg -40 to +100 *°C
*1: L7850 series is guaranteed to resist temperature cycle test of up to 5 cycles.
■ Electrical and optical characteristics (Ta=25 °C)
L7850/-01
Parameter Symbol Condition Min. Typ. Max. Unit
Peak emission wavelength lpI.=50 mA 1.4 1.45 1.5 µm
Spectral half width (FWHM) Dl I.=50 mA -100 150 nm
Radiant flux feI.=50 mA 0.7 1.0 - mW
Forward voltage V.I.=50 mA -1.0 1.5 V
Pulse forward voltage V.2 I.=1 A - 2 3 V
Reverse current I4V4=1 V - - 10 µA
Cut-off frequency * fc I.=50 mA ± 10 mAp-p 1 3 - MHz
*2: Frequency at which the light output drops by -3 dB based on light output at 100 kHz.
L7850 series may be damaged or performance may deteriorate due to static electricity, so use caution when handling.
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, 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.: 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 inaccuracies or omissions.
Specifications are subject to change without notice. No patent rights are granted to any of the circuits described herein. ©2001 Hamamatsu Photonics K.K.
Cat. No. KLED1036E01
Dec. 2001 DN
Infrared LED
L7850 series
-40 -20 0 20
(Typ.)
40 60 80 100
0
40
60
80
100
AMBIENT TEMPERATURE (˚C)
RELATIVE ALLOWABLE FORWARD CURRENT (%)
20
RELATIVE RADIANT OUTPUT (%)
(Typ. Ta=25 ˚C)
80
%
40
%
60
%
20
%
20˚10˚10˚20˚
90˚
80˚
50˚
40˚
30˚
70˚
60˚
90˚
80˚
50˚
40˚
30˚
70˚
60˚
L7850
L7850-01
100 %
-40 -20 40 100020 6080
+3
-1
+2
-2
+1
0
-3
-4
-5
(Typ. I
F
=50 mA)
AMBIENT TEMPERATURE (˚C)
RELATIVE RADIANT OUTPUT (dB)
2
■ Emission spectrum
KLEDB0233EA
1.2 1.3 1.4 1.5 1.6
100
60
20
80
40
0
(Typ. Ta=25 ˚
C,
I
F
=50 mA)
WAVELENGTH (µm)
RELATIVE RADIANT OUTPUT (%)
■ Radiant flux vs. forward current
KLEDB0234EA
10 100 1000
100
1
10
0.1
(Typ. Ta=25 ˚
C, tw=100 µs, 0.1 %
)
FORWARD CURRENT (mA)
RADIANT FLUX (mW)
■ Forward current vs. forward voltage
KLEDB0235EA
0.5 1.5 2.51.0 2.0
1000
100
10
(Typ. Ta=25 ˚
C, tw=100 µs, 0.1 %
)
FORWARD VOLTAGE (V)
FORWARD CURRENT (mA)
■ Directivity
KLEDB0236EA
■ Radiant output vs. ambient
temperature
KLEDB0237EA
■ Allowable forward current vs.
ambient temperature
KLEDB0027EB
■ Allowable forward current vs.
duty ratio
KLEDB0225EA
0.01
DUTY RATIO (%)
ALLOWABLE FORWARD CURRENT (A)
0.01
0.1 1 10 100
0.1
1
10
PULSE WIDTH=1 µs
(Typ.
Ta=25
˚C)
PULSE WIDTH=100 µs
PULSE WIDTH=10 µs
■ ■
■ ■
■ Dimensional outlines (unit: mm)
L7850 L7850-01
5.4 ± 0.2
4.7 ± 0.1
GLASS WINDOW
3.0 ± 0.1
3.6 ± 0.2
13.5
2.54 ± 0.2
0.45
LEAD
COMMON TO CASE
4.65 ± 0.1
4.5 ± 0.2
5.85 ± 0.213.5
5.4 ± 0.2
2.54 ± 0.2
COMMON TO CASE
0.45
LEAD
KLEDA0071EB KLEDA0074EA
