SFH551/1-1 and SFH551/1-1V
Receiver with Digital Output Stage
for Polymer Optical Fiber Applications
Data Sheet
Description
The SFH551/1-1 receiver is a transimpedance amplifier
with an integrated photodiode and TTL open-collector
output stage. The active area of this detector combined
with the molded microlens gives an efficient coupling
from the end of the polymer optical fiber. This receiver
enables data rates up to 5 MBd and works with the Avago
SFH757 transmitter diode.
The SFH551/1-1 is fully DC coupled and therefore no
line code is needed. The internal Schmitt trigger ensures
stable output states over the whole dynamic range. If
light with intensity above the threshold level is coupled
into the SFH551/1-1, the electrical output will be logical
“low” and vice versa.
With noisefree Vcc and GND, an undefined output signal
is not possible. Nevertheless, the SFH551/1-1 must not
be used without shielding from ambient light. If ambient
light could reach the threshold level, the SFH551/1-1V
component should be chosen. The plastic connector
housing of the SFH V-series shields the ambient light
perfectly.
SFH series components are optimized for easy coupling.
No fiber stripping is required; just insert the cut fiber into
the selected SFH component.
Features
Bipolar IC with open-collector output
Digital output, full TTL compatible
Sensitive in visible and near IR range
Transfer rate ≤ 5MBd
Low switching threshold
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
Ordering Information
Applications
Household electronics
Power electronics
Optical networks
Application Literature
AN #
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
5342
SFH551/1-1
Type
SFH551/1-1
SFH551/1-1V
SFH551/1-1V
Ordering Code
SP000063860
SP000063855
5341
SFH551/1-1
The transparent plastic package has an aperture where a
2.2 mm fiber end can be inserted. This coupling method
is very easy and extremely cost-effective.
Functionality
The SFH551/1-1 photodiode is silicon based and directly
connected to a transimpedance amplifier that works as
a pre-amplifier. A differential amplifier is connected in
series and works as a post-amplifier. Its output is passed
to the internal Schmitt trigger that drives a bipolar NPN
transistor. The data-out signal is from the collector of this
bipolar transistor.
V
CC
SFH551/1-1V
The V-housing allows easy coupling of unconnectorized
2.2 mm polymer optical fiber by an axial locking screw.
The SFH551/1-1 receiver is a transimpedance amplifier
with a TTL open-collector output stage, therefore a
pull-up resistor of at least 330 Ω is necessary (see Figure
1). To minimize interference a bypass capacitor (100 nF)
must be placed near (distance ≤ 3 cm) the SFH551/1-1
ports. In critical applications a shorter distance is better.
Data-out
R
pullup
GND
Figure 1. Equivalent circuit diagram (simplified)
Package Dimensions
SFH551/1-1
view from A
surface not flat
0.5
0.55
8.6
0.5
7.65
4.6
GND DATA
A
∅
4.625
∅
2.275
Vcc
0.55
1.5
24.5
5.3
12.2
Dimensions in mm
SFH551/1-1V
24.0
13.5
9.0
DATA
SFH551/1-1
component
3.5
0.55
0.5
7.62
spacing
∅
0.6
0.5
locking screw
Vcc GND DATA
2.54
5.08
Dimensions in mm
2
4.8
8.8
2.54
2.54
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.
Package V-housing mounting pins
Package V-housing axial locking screw
Technical Data
Absolute Maximum Ratings
Parameter
Operating Temperature range
Storage Temperature range
Supply Voltage Range without Damage
Soldering Temperature (2mm from case bottom, t≤5s)
Minimum Supply Voltage for Function
Minimum Pullup Resistance (Vcc=5.0V)
Output Voltage
Output Current
Power Dissipation (Output)
Electrostatic Discharge Voltage Capability
Electrostatic Discharge Voltage Capability
Symbol
T
C
T
stg
V
CC
T
S
V
CC min
R
outmin
V
O
I
C
P
O
ESD
ESD
Min
-40
-40
-0.5
4
330
-0.5
Typ
Max
+85
+100
15
+260
Unit
°C
°C
V
°C
V
Ω
Notes
Figure
1
15
50
100
2000
400
V
mA
mW
V
V
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
3
Characteristics (T
A
= -40°C to +85°C; Vcc = 4.75V to 5.25V) unless otherwise specified
Parameter
Maximum Photosensitivity Wavelength
Photosensitivity Spectral Range (S=80% of Smax)
Mean POF Overdrive Limit:
Maximum Input ( = 650 nm)
Peak POF Sensitivity Limit:
Minimum Input for Logic “0” ( = 650 nm)
Peak POF Off State Limit:
Maximum Input for Logic “1” ( = 650 nm)
Propagation Delay (Input: Pattern “1010”, 5MBd)
(Optical Input to electrical Output)
Output Voltage at Logic “1”
Output Voltage at Logic “0”
Switching times (Input: Pattern “1010”, 5MBd)
Output Rise time (10% - 90%)
Output Fall time (90% - 10%)
Current Consumption
(Input: Pattern “1010”, 5MBd)
Current Consumption (Logic“1”, Light OFF)
Current Consumption (Logic“0”, Light ON)
* Typical value = mean value at TA=25°C and Vcc=5. 0V
Notes:
1. PWSFH_output = PWopt_input + (tPLH – tPHL); PW = pulse width
2. Switching times increase with temperature
3. Measured with recommended Rpullup = 330Ω (see Figure 1)
4. Sensitivity increase with temperature
5. Value
dBm
=10*log(Value
measured
/ 1mW)
6. Limits valid for optical input power from -20dBm(mean) to -9dBm(mean)
7. dBm(peak) = dBm(mean) + 3dB
8. PWD ≤ 170ns; Input: Pattern “1010”, 5MBd
Symbol
smax
s
P
IN(max)
P
IN(L)
P
IN(H)
t
PHL
t
PLH
V
OH
V
OL
tr
tf
Icc
IccH
IccL
Min
600
252
-6
20
-17
Typ*
700
Max
780
Unit
nm
nm
μW
dBm(mean)
μW
dBm
Notes
Figure
1000
0
6.3
-22
0.1
-40
120
270
5, 7, 8
4, 5
4, 5
1, 6
1, 6
3
3
2, 3, 6
2, 3, 6
3, 6
3
3
4
μW
dBm
ns
ns
V
V
ns
ns
mA
mA
mA
2,3,4
2,3,4
Vcc-0.6
Vcc-0.3
0.2
14
4
0.6
30
15
20
6.5
23
8
1.5
13
14
3.5
17.5
Light on
PW
opt_input
Light off
V
OH
V
OL
t
PHL
PW
SFH_output
t
PLH
OPTICAL
INPUT
PW*SFH_output = PW*opt_input + (tPLH – tPHL)
PWD*= (tPLH – tPHL)
*PW=pulse width, *PWD=pulse width distortion
OUTPUT
SFH551/1-1
Figure 2. Typical corresponding optical input to electrical output signal
4
250
200
Propagation delay in ns
Propagation Delay
t
PLH
85°C
t
PLH
25°C
t
PLH
-40°C
150
100
50
0
t
PHL
85°C
t
PHL
25°C
t
PHL
-40°C
-28
-26
-24
-22
-20
-18
-16
-14
-12
-10
-8
-6
Optical Input Power in dBm (mean value)
Figure 3. Typical Propagation delay, measured with Pattern “1010” at 5 MBd
160
140
Pulse Width Distortion in ns
Pulse Width Distortion
PWD at -40°C
PWD at 25°C
PWD at 85°C
120
100
80
60
40
20
0
-20
-28
-26
-24
-22
-20
-18
-16
-14
-12
-10
-8
-6
Optical Input Power in dBm (mean value)
Figure 4. Typical Pulse Width Distortion, measured with Pattern “1010” at 5 MBd
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.
Data subject to change. Copyright © 2005-2011 Avago Technologies. All rights reserved. Obsoletes AV01-0713EN
AV02-3033EN - October 25, 2011
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