L8957 [HAMAMATSU]
Low cost LED ideal for optical encoders; 低成本LED非常适用于光学编码器
| 型号： | L8957 |
| 厂家： | 
HAMAMATSU CORPORATION |
| 描述： | Low cost LED ideal for optical encoders |
| 文件： | 总2页 (文件大小：113K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
L E D
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
Low price
Uses low cost lens
Optical encoders
Optical switches
ꢀ Absolute maximum ratings (Ta=25 °C, unless otherwise noted)
Parameter
Reverse voltage
Symbol
Value
Unit
V
VR
IF
5
80
Forward current
mA
Forward current reduction rate
Pulse forward current
Pulse forward current reduction rate
Power dissipation
-
0.67
mA/°C
A
IFP
-
0.5
7
mA/°C
mW
°C
P
150
Operating temperature
Storage temperature
Topr
Tstg
-30 to +85
-40 to +100
°C
ꢀ Electrical and optical characteristics (Ta=25 °C)
Parameter
Peak emission wavelength
Spectral half width
Radiant flux
Symbol
lp
Condition
IF=50 mA
Min.
840
-
Typ.
870
45
Max.
Unit
nm
900
Dl
IF=50 mA
IF=50 mA
IF=50 mA
VR=5 V
-
nm
fe
3.4
-
5.8
1.6
-
-
mW
V
Forward voltage
VF
1.75
Reverse current
Spot light size *1
Optical output *2
IR
-
5
-
µA
Bw IF=30 mA
4.5
1.0
25
5.0
2.0
40
mm
mW
MHz
Pe
fc
IF=30 mA
-
Cut-off frequency *3
IF=30 mA ± 4 mAp-p
-
*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 L8957
ꢀ Directivity
ꢀ Forward current vs. forward voltage
(Typ. Ta=25 ˚C)
10˚ 20˚
(Typ. Ta=25 ˚C)
20˚
10˚
0˚
100
100 %
30˚
40˚
30˚
40˚
80
%
80
60
60 %
40 %
50˚
60˚
50˚
60˚
40
20
%
20
70˚
80˚
90˚
70˚
80˚
90˚
0
0.5
1.0
1.5
2.0
FORWARD VOLTAGE (V)
RELATIVE RADIANT OUTPUT (%)
KLEDB0227EA
KLEDB0247EA
ꢀ Radiant output vs. ambient temperature
ꢀ Allowable forward current vs. ambient temperature
(Typ. IF=50 mA)
(Typ.)
+2
+1
0
100
80
60
-1
-2
-3
40
20
0
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
AMBIENT TEMPERATURE (˚C)
AMBIENT TEMPERATURE (˚C)
KLEDB0228EA
KLEDB0229EB
ꢀ Light intensity distribution
ꢀ Dimensional outline (unit: mm)
5.4 0.2
(Typ. Ta=25 ˚C)
100
4.65 0.15
L=5 mm
L=8 mm
80
60
40
20
L=10 mm
0.45
LEAD
2.54 0.2
IMAGE
SENSOR
LED
-1
L
0
-4
-3
-2
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. ©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
Cat. No. KLED1039E01
Aug. 2002 DN
2
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