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LED
Infrared LED
L8957
Low cost LED ideal for optical encoders
L8957 is an infrared LED using a low-cost lens and available at a lower price than other products up to now.
Features
Applications
l Low price
Uses low cost lens
l Optical encoders l Optical switches
I Absolute maximum ratings (Ta=25 C, unless otherwise noted)
Parameter Symbol Reverse voltage V4 Forward current I. Forward current reduction rate Pulse forward current I.2 Pulse forward current reduction rate Power dissipation P Operating temperature Topr Storage temperature Tstg
Value 5 80 0.67 0.5 7 150 -30 to +85 -40 to +100
Unit V mA mA/C A mA/C mW C C
I Electrical and optical characteristics (Ta=25 C)
Parameter Symbol Condition Min. Typ. Max. Unit Peak emission wavelength I.=50 mA 840 870 900 nm lp Spectral half width I.=50 mA 45 nm Dl Radiant flux fe I.=50 mA 3.4 5.8 mW Forward voltage V. I.=50 mA 1.6 1.75 V Reverse current I4 V4=5 V 5 A Spot light size * Bw I.=30 mA 4.5 5.0 mm Optical output * Pe I.=30 mA 1.0 2.0 mW Cut-off frequency *! fc I.=30 mA 4 mAp-p 25 40 MHz *1: Full width at half maximum, measurement distance (from the image sensor to the bottom surface of L8957s base)=10 mm *2: Measurement distance [from the photodiode (active area: f8 mm) to the bottom surface of L8957s base]=10 mm *3: Frequency at which the optical output drops by -3 dB from that at 100 kHz.
1
Infrared LED
I Directivity
20 10 0 100 % 30 80 % 30
L8957
(Typ. Ta=25 C) 10 20
I Forward current vs. forward voltage
100 (Typ. Ta=25 C)
FORWARD CURRENT (mA)
80
40
60 %
40
60
50 60 70 80 90
40 %
50 60
40
20 %
70 80 90
20
0
0.5
1.0
1.5
2.0
RELATIVE RADIANT OUTPUT (%)
KLEDB0247EA
FORWARD VOLTAGE (V)
KLEDB0227EA
I Radiant output vs. ambient temperature
+2 (Typ. IF=50 mA)
I Allowable forward current vs. ambient temperature
(Typ.)
RELATIVE ALLOWABLE FORWARD CURRENT (%)
100
RELATIVE RADIANT OUTPUT (dB)
+1
80
0
60
-1
40
-2
20
-3
0
20
40
60
80
100
0 -40 -20 0 20 40 60 80 100
AMBIENT TEMPERATURE (C)
KLEDB0228EA
AMBIENT TEMPERATURE (C)
KLEDB0229EB
I Light intensity distribution
100 L=5 mm (Typ. Ta=25 C)
I Dimensional outline (unit: mm)
5.4 0.2 4.65 0.15
RELATIVE RADIANT OUTPUT (%)
80
60
L=10 mm
0.45 LEAD
40
2.54 0.2
20
LED
L
IMAGE SENSOR
0 -4 -3 -2 -1 0 1 2 3 4
COMMON TO CASE
POSITION ON IMAGE SENSOR (mm)
KLEDB0248EA KLEDA0077EA
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. (c)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: Smidesvagen 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
0.6 MAX.
(0.4)
L=8 mm
13.5 1.0 4.7 0.3
3.7 0.2
2
Cat. No. KLED1039E01 Aug. 2002 DN

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