8A–7
DESCRIPTION
The SFH551/1-1 is a photodetector to be used with 1000 micron plastic
optical fiber. This device amplifies incoming signals via a DC coupled
trans-impedance amplifier, and its open collector output is TTL compatible.
The SFH551/1-1 includes a Schmidtt trigger function to provide stable
outputs over the entire dynamic range. This helps prevent false data sig-
nals due to noise on the power supply or ground line.
The SFH551/1-1 comes in a T1
3
/
4
plastic package with a tubular aper-
ture wide enough to accomodate fiber and cladding. The SFH551/1V-1 is
housed in a unique plastic right angle package for easy coupling
between the fiber and the photodetector.
The SFH551/1V-1 is suitable for data communication uses such as:
LANs, medical equipment, and automotive electronics.
Characteristics
T
A
=25
°
C, V
CC
=4.75 V to 5.25 V
See Appnote 40, 41, 43 for application information.
Parameter Symbol Value Unit Condition
Current Consumption
without output current I
CC
4 (<8) mA V
CC
=5 V
Output Voltage, Low V
OL
0.4 (
≤
0.6) V I
OL
=13 mA,
Φ
outL
≥
4 mW
Output Current, High I
OH
5 (
≤
300)
µ
AV
OH
=5.25 V,
Φ
outH
≤
0.1 mW
Optical Power, Low
Φ
outL
6 to 500
–22 to –3
µ
W
dBm
λ
=660 nm
Optical Power, High
Φ
outH
≤
0.1
–40
µ
W
dBm
λ
=660 nm
Delay Times t
pHL
t
pLH
<100
<250 ns
ns
Φ
outL
=6
µ
W to 50
µ
W
R
L
=390
Ω
,
C
L
=15 pF, I=1 m
Pull Up Resistance R
L
>330
Ω
V
CC
=5 V
FEATURES
• Bipolar IC with open-collector output
• Digital output, TTL compatible, open collector
• Uses Schmidtt trigger for noise immunity
• Suitable f or 2.2 mm plastic fiber with 1 mm core
diameter
• Transfer rate
≤
5 MBit/s
• Low switching threshold
• High sensitivity from integrated
µ
lens
• SFH551/1-1: T1
3
⁄
4
(5 mm) package
• SFH551/1V-1: right angle plastic housing
• SFH551/1V-1: easy coupling to plastic fiber
without stripping or decladding
Maximum Ratings
Storage Temperature Range (T
STG
).....–55 to 100
°
C
Operating Temperature Range (T
OP
).....–40 to 85
°
C
Supply Voltage (V
CC
) .............................–0.5 to 15 V
Output Voltage (V
O
)................................–0.5 to 15 V
Output Current (I
O
)..........................................50 mA
Power Dissipation (output) (P
O
).....................85 mW
Block Diagram
Delay Time
1
2
3
VCC
Data
GND
100 nF
A bypass capacitor
(100 nF) near the
device is neces-
sary between VCC
and ground.
IF
t
5V
VO
VOL tPHL tPHL
1.5V t
5 mm LED PACKAGE
SFH551/1-1
RIGHT ANGLE HOUSING
SFH551/1V-1
Plastic Fiber Optic Integrated Photodetector
Dimensions in inches (mm)
SFH551/1-1 SFH551/1-V-1
Data
Ground
VCC
.307 (7.8)
.295 (7.5)
Frame
2 x .10
(2 x 2.54)
.992 (25.2)
.953 (24.2)
.024 (0.6)
.016 (0.4) Surface not flat
.071 (1.8)
.047 (1.2)
.492 (12.5)
469 (11.9)
.217 (5.5)
.201 (5.1)
.187 (4.75)
.177 (4.5)
.354 (9.0)
.323 (8.2)
.093 (2.35)
.087 (2.2)
.182
(4.6)
.362 (9.20)
.346 (8.80)
.200
(5.08)
.354 (9.00)
.339 (8.60)
.157 (4.00)
.118 (3.00)
.300
(7.62)
∅.024 (0.6)
.953 (24.20)
.937 (23.80)
VCC
GND
Data
.138±.020
(3.5±0.5)
.100
(2.54)
.024 (0.60)
.016 (0.40) Screw-on
connector
