10
Applications
FDDI
ATM-SDH/SONET 155Mbps
Intra-Office
Telecommunications
General Purpose
Features
1320nm Surface-Emitting
LED
125MHz Bandwidth
Designed for 62.5/125m
Fiber
Aligned in ST
Receptacle
MTTF >1,000,000 hours
Description
This LED is designed for
Datacom, Telecom and General
Purpose Applications. It has a
long wavelength LED for links up
to 10 km at 125Mbps. It meets
standards for FDDI (ANSI
X3T9.5) and ATM155Mbps.
The device is optimized for
62.5/125m fiber and actively
aligned in an ST receptacle.
The MF432 PIN Photodiode
is recommended as Receiver
for this LED.
13324.11 1997-04-01
DETECTOR
FIBER
MF431
LED
BOTTOM VIEW
ANODE
CASE
CATHODE
MF431
Datacom, Telecom, General Purpose LED
Ordering Information
PART #
RECEPTACLE
MF431 ST
ST
-40C to +85C
ST Assembly
MF431 ST
MF431 Functional Diagram
11
Thermal Characteristics
Units
C/W
C/W
%/C
nm/C
Max.
200
300
Min.
Typ.
-0.75
0.45
Symbol
R
thjc
R
thjb
dP/dT
j
/dT
j
Parameter
Thermal Resistance - Infinite Heat Sink
Thermal Resistance - On PCB
Temperature Coefficient - Optical Power
Temperature Coefficient - Wavelength
Optical & Electrical Characteristics (Case Temperature -25 to +70C)
Units
dBm
ns
MHz
nm
nm
V
A
pF
Test Conditions
I
Peak
=60mA (Note 1, 2)
I
F
=60mA (Note 2, 3)
I
F
=60mA (Note 2)
I
F
=60mA (Note 3)
I
F
=60mA (Note 3)
I
F
=60mA
V
R
=1V
V
R
=0V, f=1MHz
Max.
2.5
1355
170
1.65
100
Min.
-19
1285
Typ.
2.0
125
1320
135
1.3
200
Symbol
P
fiber
t
r
t
f
f
c
p
V
F
I
R
C
Parameter
Fiber-Coupled-Power (Fig 1, 2, 3)
Rise & Fall Time (10-90%, no bias)
Bandwidth (3dB
el
)
Peak Wavelength
Spectral Width (FWHM)
Forward Voltage (Fig 5)
Reverse Current
Capacitance
Note 1: Average power at 10MHz/50% duty cycle. Measured at the exit of 100m of fiber.
Note 2: 62.5/125m graded index fiber (NA = 0.275).
Note 3: Meets the FDDI ANSI X3T9.5 specification for FDDI.
Absolute Maximum Ratings*
Units
C
C
mW
mA
mA
V
C
Max.
+85
+85
160
80
130
0.5
260
Min.
-40
-40
Symbol
Tstg
Top
Ptot
IF
IFRM
VR
Tsld
Parameter
Storage Temperature
Operating Temperature (Fig 4)
Electrical Power Dissipation (Fig 4)
Continuous Forward Current (f
10kHz)
Peak Forward Current (duty cycle
50%, f
1MHz)
Reverse Voltage
Soldering Temperature (Note 1)
*Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied.
Note 1: 2mm from the case for 10s.
Datacom, Telecom, General Purpose LED
MF431
12
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
RELA
TIVE FIBER-COUPLED PO
WER
0
20
40
60
80
100
%
0
20
40
60
80
100
m
RELA
TIVE FIBER-COUPLED PO
WER
r - RADIAL DISPLACEMENT OF FIBER
r
z = opt.
c = 62.5
m
z
0
20
40
60
80
100
%
0
40
80
120
160
200 mA
FORWARD CURRENT
50% DUTY CYCLE
DC
HEAT SINKED
mW
300
200
100
0
0
50
100
150
C
ON PC BOARD
OPERATING TEMPERATURE
MAX. ELECTRICAL POWER DISSIPATION
INFINITE
HEAT SINK
0
20
40
60
80
100
%
0.5
1.0
1.5
2.0
2.5 3.0 mm
z - AXIAL DISPLACEMENT OF FIBER
RELA
TIVE FIBER-COUPLED PO
WER
r
r = opt.
c = 62.5
m
z
FORWARD VOLTAGE
FORWARD CURRENT
mA
200
100
0
0
1
2
3
V
RELA
TIVE FIBER-COUPLED PO
WER
MF431
Datacom, Telecom, General Purpose LED
13
12.7
MARKING SIDE
SLOT SIDE
9.5
0.4
7.89
2-56 UNC - 2B
max.0.5
min.12
20.1
3.9
5.4
7.6
3/8"-32 UNEF
0.006
FIBER
END
2.5
2.502
+0.01
0
+0
-0.004
RECOMMENDED
FERRULE
(not included)
5.4
2.5
Typical Drive Circuit
ST Packaging Hardware
-5V
V
REF
ECL
I
MF431
9.53
12.70
1.65
0.46
10.41
14.27
HEX-NUT
WASHER
3/8 - 32 UNEF
2B THREAD
Note: The LED chip is isolated from the case. All dimensions in mm.
Datacom, Telecom, General Purpose LED
MF431
MF431 ST Mechanical Data
M Mitel (design) and ST-BUS are registered trademarks of MITEL Corporation
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All Rights Reserved
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