Transmitter for Polymer Optical Fiber Applications
Data Sheet
Description
The SFH757 is a low-cost transmitter diode for optical
data transmission with polymer optical fiber. Its InGaAlP
LED chip provides enhanced resistance to humidity and
is designed to emit light at 650 nm. The robust SFH757
can be used for speeds up to 100 MBd and complements
the Avago SFH250 photodiode receiver and SFH551/1-1
integrated photo detector receiver.
The SFH series is optimized for easy coupling. No fiber
stripping is required; just insert the cut fiber into the
selected SFH component.
Features
•
High speed transmitter for up to 100MBd applications
(with peaking circuits)
•
2.2mm aperture holds standard 980/1000/2200µm
plastic fibers
•
No fiber stripping required
•
Molded microlens for efficient coupling
Plastic Direct Fiber Connector housing
(V-housing)
•
Locking screw attached to the connector
•
Interference-free transmission by the light-tight
housing
•
Transmitter and receiver can be positioned flexibly
•
No cross talk
•
Auto insertable and wave solderable
•
Supplied in tubes
SFH757
The transparent plastic package has an aperture where a
2.2 mm fiber end can be inserted. This very easy coupling
method is extremely cost-effective.
SFH757V
The V-housing allows easy coupling of unconnectorized
2.2 mm polymer optical fiber with an axial locking screw.
Ordering Information
Applications
•
Household electronics
•
Power electronics
•
Optical networks
•
Light barriers
SFH757
Type
SFH757
SFH757V
Application Literature
SFH757V
Ordering Code
SP000063871
SP000063858
AN #
5342
Description
General information about the SFH series
with Selection Guide and recommendations
regarding System Planning and Mounting
Information about Basic and Special Circuits for
Transmitter and Receiver of the SFH series
5341
Package Dimensions
SFH757
surface not at
8.6
7.65
0.5
0.6
view from A
0.5
A
28
∅
4.625
4.6
∅
2.275
1.5
5.3
Cathode
Dimensions in mm
SFH757V
24.0
13.5
SFH757
component
4.8
8.8
9.0
Cathode
3.5
0.5
7.62
spacing
∅
0.6
locking screw
2.54
5.08
Dimensions in mm
Package V-housing Color
SFH V-series components are color coded just like other
Avago fiber optic components. The SFH757V transmitter
has a white colored housing; the SFH250V and SFH551/1-
1V receiver components have a black colored housing.
This prevents mistakes while making connections.
Product designation and date of manufacture are printed
on the housing.
Package V-housing axial locking screw
Components of the SFH V-series are equipped with an
axial locking screw for easy coupling to the unconnec-
torized 2.2 mm polymer optical fiber. The force that is
necessary to pull a jammed fiber out of the V-housing is
typically 50 N (with a torque of 15 cNm for tightening the
locking screw). This is an approximate value that is very
dependent on the fiber and torque combination.
Package V-housing mounting pins
SFH V-series components have two pins that are electri-
cally isolated from the inner circuit. The pins are only
designed for mounting the V-housing to the PCB surface.
This helps increase stability, which is needed during
fixing the fiber end by the axial locking screw.
The retention force between the soldered mounting pins
and the V-housing of the SFH component is about 20 N
(with a vertical exertion of force). This is an approximate
value.
2
Package V-housing mounting pins
Package V-housing axial locking screw
2.54
Technical Data
Absolute Maximum Ratings
Parameter
Operating Temperature range
Storage Temperature range
Junction Temperature
Soldering Temperature
(2mm from case bottom, t≤5s)
Reverse Voltage
Forward Current
Power Dissipation
Thermal Resistance (Junction/Air)
Electrostatic Discharge Voltage Capability
Electrostatic Discharge Voltage Capability
Symbol
T
C
T
stg
T
J
T
S
V
R
I
F
P
tot
R
thJA
ESD
ESD
Min
-40
-40
Typ
Max
+85
+100
+100
+260
3
50
120
450
2000
400
Unit
°C
°C
°C
°C
V
mA
mW
K/W
V
V
Notes
Figure
1
1
2
Notes:
1. ESD Capability for all Pins HBM(Human Body Model) according JESD22-A114
2. ESD Capability for all Pins MM (Machine Model) according JESD22-A115
Characteristics (T
A
= -40°C to +85°C) unless otherwise specified
Parameter
Peak Wavelength
Spectral Bandwidth (FWHM)
Switching Times (R_ILED = 100Ohm)
T_rise (10%...90%)
T_fall (90%.. 10%)
T_rise (10%...90%)
T_fall (90%.. 10%)
Capacitance (fmeas = 1MHz; Vf = 0V)
Forward Voltage (I
LED_DC
= 50mA)
Optical Output Power (I
LED_DC
= 10mA)
Symbol
λ
PEAK
Δλ
tr
tf
tr
tf
C
S
V
F
V
F
P
OPT
P
OPT
Min
630
Typ*
650
20
14
16
Max
685
30
20
24
25
27
2.6
2.7
-2.5
-1.5
Unit
nm
nm
ns
ns
ns
ns
pF
V
V
dBm
dBm
Notes
Figure
5
5
1,2,4
1,2,4
1,4
1,4
2
2,3,5
3,5
4
4
3
3
52
2.0
-10.5
-12.5
-6.2
Coefficient
Optical Power Temperature Coefficient
Forward Voltage Temperature Coefficient
Wavelength Temperature Coefficient
*
Typical value = mean value at TA = 25°C
Symbol
T
POPT
T
VF
T
λ
Value
-0.4
-1.8
0.16
Unit
%/K
mV/K
nm/K
Notes
6,7
Figure
Notes:
1. Given switching time values can be reduced by suitable driver circuits. Also an increase of LED-Current leads to a reduction of the switching times.
2. Measured at 25°C
3. The optical output power coupled into a polymere optical fiber (NA=0.5) is measured with a large area detector at the end of a short fiber (about 1m).
4. Driver circuit for the characterization process: see Figure 2 (Vcc=5.0V; installed R_ILED = 100Ohm)
5. Value
dBm
=10*log(Value
measured
/1mW)
6. Only valid for a used LED-current in the range of 10mA to 50mA (DC-Current). Optical Power Temperature Coefficient for temperatures between -40°C
and 25°C is almost 0%/K.
7. Value for +25°C to +85°C
3
80
I
F
- Forward Current (mA)
60
Maximum Forward Current
Vcc
100 uF
10 uF
1k Ohm
R_ILED
R
thJA
= 450 K/W
40
20
0
SN75451BD
1A
2B
2A
2Y
SFH757
1A
Vcc
Data In
GND
51 Ohm
1Y
GND
GND
0
20
40
60
T
A
- Temperature (°C)
80
100
GND
GND
Figure 1. Maximum Forward Current
+2
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
Optical Output Power
Figure 2. Measurement circuit
2.5
2
Forward Voltage (V)
Forward Voltage
Optical Output Power (dBm)
1.5
1
0.5
0
0
5
10
15
20 25 30 35
DC-LED Current (mA)
40
-40°C
25°C
85°C
45
50
-40°C
25°C
85°C
0
5
10
15
20 25 30 35
DC-LED Current (mA)
40
45
50
Figure 3. Typical Optical Output Power
Spectral Emission (100% = Peak Power)
Figure 4. Typical Forward Voltage
100
90
80
70
60
50
40
30
20
10
0
600
Relative optical output power (%)
625
650
Wavelength (nm)
675
700
Figure 5. Typical Spectral Emission
For product information and a complete list of distributors, please go to our web site:
www.avagotech.com
Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies in the United States and other countries.
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