L8045_15 Datasheet, PDF (1/2 Pages) Hamamatsu Corporation – Red LED for optical link

LED
Red LED for optical link
L8045
Emitter for 50 Mbps optical link
L8045 is optical communication devices designed for POF (Plastic Optical Fiber) data links. L8045 is a highly reliable, high-
power LED that emits red light with a peak at 650 nm optimized for POF. A mini-lens is molded on the package for efficient coupling
to a POF. When used with our recommended driver circuit, a 50 Mbps transmitter can be configured at low cost.
Features
Applications
l Peak wavelength: 650 nm
l High reliability
l High output
l Designed to be used with S8046 or S7141-10
l High-speed data transmission even under poor environmental
conditions with high noise
s Absolute m axim um ratings (Ta=25 °C)
Parameter
Symbol
Value
Unit
Forward current
IF
40
mA
Reverse voltage
VR
5
V
Power dissipation *¹
Pmax
250
mW
Operating temperature
Topr
-40 to +85
°C
Storage temperature
Tstg
-40 to +85
°C
Soldering
-
230 °C, 5 s, at least 1.8 mm away from package surface
-
*1: Derate power dissipation at a rate of -1.75 mW /°C above Ta=25 °C
s Electrical and optical characteristics (Ta=25 °C)
Parameter
Symbol
Condition
Min.
Typ.
Max.
Unit
Data rate
fD
NRZ
DC
-
50
Mbps
Forward voltage
VF
IF=20 mA
-
1.9
2.3
V
Reverse current
IR
VR=5 V
-
-
10
µA
Peak wavelength
λp
IF=20 mA
-
650
-
nm
Spectral half width (FW HM)
Fiber-coupled optical output
∆λ
IF=20 mA
Po
*²
-
20
-13
-
-
nm
-8
dBm
Rise time at pulse drive
tr
*² 20 to 80 %
-
-
8
ns
Fall time at pulse drive
tf
*² 80 to 20 %
-
-
8
ns
Pulse distortion
∆T
*²
-3
-
+1
ns
Jitter
∆tj
*²
-
-
3
ns
*2: Input is a pseudo-random bi-phase signal at 50 Mbps.
Average value (duty ratio 50 %) measured by using a plastic fiber of φ1 mm. SI-POF and NA=0.5 (GH4001 made by
Mitsubishi Rayon).
Measured with the recommended driver circuit shown below. (Measurement conditions: Vcc=4.5 to 5.5 V, R1=750 Ω ,
R2=2.2 kΩ, R3=22 Ω, C1=35 pF)
Vcc
Icc
SIGNAL INPUT
4.7 mF
1 ^{14 74ACT08} R1
2
3
7
C1
0.1 mF R2
L8045
1
R3 ²
3
4
KLEDC0018EB
Note:
· A bypass capacitor (0.1 µF) and another capacitor (4.7 µF) are connected between Vcc and GND at a position within 3 mm from
the lead.
· The center of the optical fiber is aligned with the center of the lens on the package. The distance between the fiber end and the
lens is 0.1 mm.
1