LED
Infrared LED
L2791 series
Small emission spot LED using current confined chip
L2791 is infrared LED with a microball lens cemented to the current confined chip surface. This combination ensures high directivity and improved
emission uniformity. In particular, L2791-02 uses a lens cap that delivers even narrower directivity. As a variant type not using a microball lens,
L2791-03 is also available with the LED chip potted with resin, which gives a small emission spot of
φ160 µm.
Features
L2791 :
φ400 µm
L2791-03:
φ160 µm
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Uniform emission: L2791/-02
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Narrow directivity: L2791/-02
Applications
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Small emission spot
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Automatic control systems
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Optical switches
l
Auto-focus
s
Absolute maximum ratings (Ta=25
°C)
Parameter
Forward current
Reverse voltage
Pulse forward current
O p era ting te m pe ratu re
Storage temperature
Symbol
I
F
V
R
I
FP
Topr
Tstg
Condition
Value
80
3
0.5
-30 to +85
-40 to +100 *
Unit
mA
V
A
°C
°C
Pulse width=10 µs
Duty ratio=1 %
* L2791-03 is guaranteed to resist temperature cycle test of up to 5 cycles.
s
Electrical and optical characteristics (Ta=25
°C)
Parameter
Peak emission
wavelength
Spectral half width
Forward voltage
Pulse forward voltage
Reverse current
Radiant flux
Radiant illuminance
Rise time
Fall time
Symbol
λp
∆λ
V
F
V
FP
I
R
φe
P
E
tr
tf
Condition
I
F
=50 mA
I
F
=50 mA
I
F
=50 mA
I
F
=0.5 A
V
R
=3 V
I
F
=50 mA
I
F
=50 mA
I
F
=50 mA, 10 to 90 %
I
F
=50 mA, 90 to 10 %
L2791
Min. Typ. Max.
850
-
-
-
-
1.6
-
-
-
880
60
1.5
3.2
-
2.0
1.3
0.12
0.12
910
-
1.7
4.0
10
-
-
0.2
0.2
L2791-02
Min. Typ. Max.
850
-
-
-
-
1.6
-
-
-
880
60
1.5
3.2
-
2.0
2.0
0.12
0.12
910
-
1.7
4.0
10
-
-
0.2
0.2
L2791-03
Min. Typ. Max.
850
-
-
-
-
4.0
-
-
-
880
60
1.5
3.2
-
5.0
-
0.12
0.12
910
-
1.7
4.0
10
-
-
0.2
0.2
Unit
nm
nm
V
V
µA
mW
mW/cm
2
µs
µs
1
HAMAMATSU [ HAMAMATSU CORPORATION ]
