L9437 Datasheet, PDF (1/2 Pages) Hamamatsu Corporation – Infrared LED LED emitting collimated light for optical encoder

LED
Infrared LED
L9437
LED emitting collimated light for optical encoder
L9437 is an infrared LED developed for optical encoders. By improving the aspherical lens used with the previous type L8506, we have achieved
an even more highly collimated beam of near infrared light. The lead pin of L9437 has no step piece that is usually formed at the lead base brazed
to the package, thus eliminating the restriction in printed circuit board design.
Features
l Collimated light beam
l Uniform light spot
l Narrow directivity: ±5˚
l High-speed response: 40 MHz Typ.
l High reliability
Applications
l Optical encoder
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
4.2
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=30 mA
840
870
900
nm
Spectral half width
∆λ IF=30 mA
-
45
-
nm
Optical output *¹
Pe IF=30 mA
1.25
1.6
-
mW
Forward voltage
VF IF=30 mA
-
1.5
1.65
V
Reverse current
IR VR=5 V
-
-
5
µA
Light spot size *²
Bw IF=30 mA
4.0 *³
4.3
-
mm
Cut-off frequency *⁴
fc IF=30 mA ± 4 mAp-p
25
40
-
MHz
*1: Measured with a photodiode (active area: φ8 mm) installed 25 mm away from LED stem undersurface.
*2: Full width at half maximum of beam spot measured with an image sensor installed 13 mm away from LED stem undersurface.
*3: Reference value
*4: Frequency at which the optical output drops by -3 dB from that at 100 kHz.ç
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