L8506 Datasheet, PDF (1/2 Pages) Hamamatsu Corporation – Infrared LED

LED
Infrared LED
L8506
LED emitting collimated light
When an LED is used for optical encoders, it must emit a uniform, small spot light. L8506 is an infrared LED that emits such a light beam
collimated by the combination of an aspheric lens. L8506 uses a non-confined structure chip that does not show an abrupt deterioration often
encountered with some types of confined chips. The structure of L8506 is also designed to have high resistance to cyclic temperature changes so
it copes with tough environmental conditions required for optical encoders used in factories.
Features
l Collimated light beam
l Uniform spot light
l Narrow directivity: ±5˚
l High-speed response: 40 MHz Typ.
l High reliability
Applications
l Optical encoder
l Optical switch
s Absolute maximum ratings (Ta=25 °C, unless otherwise noted)
Parameter
Symbol
Condition
Reverse voltage
VR
Forward current
IF
Forward current reduction rate
-
Pulse forward current
IFP
Pulse width=10 µs
Duty ratio=1 %
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
s Electrical and optical characteristics (Ta=25 °C)
Parameter
Symbol
Condition
Min.
Typ.
Max.
Unit
Peak emission wavelength
λp IF=50 mA
840
870
900
nm
Spectral half width
∆λ IF=50 mA
-
45
-
nm
Radiant flux
φe IF=50 mA
3.4
5.8
-
mW
Forward voltage
VF IF=50 mA
-
1.6
1.75
V
Reverse current
IR VR=5 V
-
-
5
µA
Spot light size *¹
IF=30 mA
-
4.3
-
mm
Cut-off frequency *²
fc IF=30 mA ± 4 mAp-p
25
40
-
MHz
*1: Full width at half maximum, measurement distance (from the sensor to the bottom surface of L8506’s base)=10 mm
*2: Frequency at which the light output drops by -3 dB from that at 100 kHz.
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