VSC8140QR VITESSE [Vitesse Semiconductor Corporation], VSC8140QR Datasheet - Page 33

• Manufacturer Part Number: VSC8140QR
• Description: 2.48832Gb/s 16:1 SONET/SDH Transceiver with Integrated Clock Generator
• Manufacturer: VITESSE [Vitesse Semiconductor Corporation]

VSC8140
Data Sheet
9/6/00
G52251-0, Rev. 4.0
Table 8: Maximum Ambient Air Temperature without Heatsink
heat sources and the direction of air flow.
Surface Mount Solderability
requirements for the various methods is described below.
Reflow Soldering
IC package, solder paste (a suspension of fine solder particles, flux, and binding agent) is required to be applied
to the printed-circuit board by screen printing, stenciling, or pressure-syringe dispensing before package place-
ment.
Table 9: Reflow Running Profile
Wave Soldering
with high component density, as solder bridging and non-wetting can present problems. Double-wave soldering
can be used, only if the method comprises a turbulent wave with high upward pressure followed by a smooth
laminar wave and the footprint must incorporate solder thieves at the downstream end. The package must be
fixed with a droplet of adhesive during placement before soldering. After the adhesive is cured, the package can
be soldered.
Average ramp up (from 183
Average ramp down (from peak to 183
Preheat Temperature (125
Temperature maintained above 183
Time within 5
Peak Temperature Range
Peak Temperature
Time 25
The results of this calculation are listed below:
Note that ambient air temperature varies throughout the system based on the positioning and magnitude of
The make-up of each lead on the PQFP and TBGA package is 85% Tin and 15% Lead. The solderability
This is the suitable method of soldering for these components. When using reflow soldering to mount the
Throughput times (this includes preheating, soldering, and cooling) are shown in Table 9.
Conventional single wave soldering is not recommended for surface mount devices or printed circuit boards
100 lfpm
200 lfpm
400 lfpm
Airflow
o
C to Peak
None
o
C of actual peak temperature
Temperature
Condition
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: [phone]
o
C)
o
C to peak temperature)
o
C
VITESSE
VITESSE SEMICONDUCTOR CORPORATION
o
SEMICONDUCTOR CORPORATION
C)
o
C (TBGA)
59
60
63
66
Transceiver with Integrated Clock Generator
-1.152
1.553
220-225
TBGA
233 sec
224
77 sec
80 sec
19 sec
o
o
C/sec
o
C/sec
C
o
C
2.48832Gb/s 16:1 SONET/SDH
o
C (PQFP)
41
52
60
66
1.5432
-1.085
220-225
228 sec
PQFP
79 sec
80 sec
19 sec
224
o
o
o
C/sec
C/sec
C
o
C
Page 33