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
Applications
l
Collimated light beam
l
Uniform spot light
l
Narrow directivity: 鹵5藲
l
High-speed response: 40 MHz Typ.
l
High reliability
l
Optical encoder
l
Optical switch
s
Absolute maximum ratings (Ta=25
擄C,
unless otherwise noted)
Parameter
Reverse voltage
Forward current
Forward current reduction rate
Pulse forward current
P uls e forw ard current reduction rate
Power dissipation
Operating temperature
Storage temperature
Symbol
V
R
I
F
-
I
FP
-
P
Topr
Tstg
Condition
Value
5
80
0.67
0.5
7
150
-30 to +85
-40 to +100
Unit
V
mA
mA/擄C
A
mA/擄C
mW
擄C
擄C
Pulse width=10 碌s
Duty ratio=1 %
s
Electrical and optical characteristics (Ta=25
擄C)
Parameter
Symbol
Condition
Min.
Typ.
Max.
Unit
Peak emission wavelength
I
F
=50 mA
840
870
900
nm
位p
Spectral half width
I
F
=50 mA
-
45
-
nm
鈭單?/div>
Radiant flux
I
F
=50 mA
3.4
5.8
-
mW
蠁e
Forward voltage
V
F
I
F
=50 mA
-
1.6
1.75
V
Reverse current
I
R
V
R
=5 V
-
-
5
碌A(chǔ)
1
Spot light size *
I
F
=30 mA
-
4.3
-
mm
2
Cut-off frequency *
fc
I
F
=30 mA 鹵 4 mAp-p
25
40
-
MHz
*1: Full width at half maximum, measurement distance (from the sensor to the bottom surface of L8506鈥檚 base)=10 mm
*2: Frequency at which the light output drops by -3 dB from that at 100 kHz.
1
1
2
