TFDU8108
Document Number 82558
Rev. 1.8, 16-Mar-07
Vishay Semiconductors
www.vishay.com
367
Recommended Solder Profiles
Solder Profile for Sn/Pb Soldering
Lead (Pb)-Free, Recommended Solder Profile
The TFDU8108 is a lead (Pb)-free transceiver and
qualified for lead (Pb)-free processing. For lead (Pb)-
free solder paste like Sn (3.0 - 4.0) Ag (0.5 - 0.9) Cu,
there are two standard reflow profiles: Ramp-Soak-
Spike (RSS) and Ramp-To-Spike (RTS). The Ramp-
Soak-Spike profile was developed primarily for reflow
ovens heated by infrared radiation. With widespread
use of forced convection reflow ovens the Ramp-To-
Spike profile is used increasingly. Shown below in fig-
ure 5 and 6 are VISHAY's recommended profiles for
use with the TFDU8108 transceivers. For more
details please refer to the application note
“SMD Assembly Instructions”
(http://www.vishay.com/docs/82602/82602.pdf).
A ramp-up rate less than 0.9 °C/s is not recom-
mended. Ramp-up rates faster than 1.3 °C/s could
damage an optical part because the thermal conduc-
tivity is less than compared to a standard IC.
Wave Soldering
For TFDUxxxx and TFBSxxxx transceiver devices
wave soldering is not recommended.
Manual Soldering
Manual soldering is the standard method for lab use.
However, for a production process it cannot be rec-
ommended because the risk of damage is highly
dependent on the experience of the operator. Never-
theless, we added a chapter to the above mentioned
application note, describing manual soldering and
desoldering.
Storage
The storage and drying processes for all VISHAY
transceivers (TFDUxxxx and TFBSxxx) are equiva-
lent to MSL4.
The data for the drying procedure is given on labels
on the packing and also in the application note
"Taping, Labeling, Storage and Packing"
(http://www.vishay.com/docs/82601/82601.pdf).
Current Derating Diagram
Figure 4. Recommended Solder Profile for Sn/Pb soldering
0
20
40
60
80
100
120
140
160
180
200
220
240
0 50 100 150 200 250 300 350
Time/s
Temperature (°C)
1
Figure 5. Solder Profile, RSS Recommendation
Figure 6. RTS Recommendation
Figure 7. Current Derating Diagram
0
25
50
75
100
125
150
175
200
225
250
275
0 50 100 150 200 250 300 350
Time/s
Temperature/°C
T
≥
255 °C for 10 s....30 s
19532
0
20
40
60
80
100
120
140
160
180
200
220
240
260
280
0 50 100 150 200 250 300
Time/s
Temperature/°C
< 4 °C/s
1.3 °C/s
Time above 217 °C t
≤
70 s
Time above 250 °C t
≤
40 s
Peak temperature T
peak
= 260 °C
< 2 °C/s
T
peak
= 260 °C max
0
100
200
300
400
500
600
- 40 - 20 0 20 40 60 80 100 120 140
Peak Operating Current (mA)
Temperature ( °C)
14875
Current derating as a function of
the maximum forward current of
IRED. Maximum duty cycle: 25 %.
