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NXP Semiconductors
PCU9955
16-channel UFm I 2 C-bus 57 mA constant current LED driver
? Process issues, such as application of adhesive and flux, clinching of leads, board
transport, the solder wave parameters, and the time during which components are
exposed to the wave
? Solder bath specifications, including temperature and impurities
18.4 Reflow soldering
Key characteristics in reflow soldering are:
? Lead-free versus SnPb soldering; note that a lead-free reflow process usually leads to
higher minimum peak temperatures (see Figure 22 ) than a SnPb process, thus
reducing the process window
? Solder paste printing issues including smearing, release, and adjusting the process
window for a mix of large and small components on one board
? Reflow temperature profile; this profile includes preheat, reflow (in which the board is
heated to the peak temperature) and cooling down. It is imperative that the peak
temperature is high enough for the solder to make reliable solder joints (a solder paste
characteristic). In addition, the peak temperature must be low enough that the
packages and/or boards are not damaged. The peak temperature of the package
depends on package thickness and volume and is classified in accordance with
Table 21 and 22
Table 21.
SnPb eutectic process (from J-STD-020C)
Package thickness (mm)
Package reflow temperature ( ? C)
Volume (mm 3 )
< 350
? 350
< 2.5
? 2.5
Table 22.
235
220
Lead-free process (from J-STD-020C)
220
220
Package thickness (mm)
Package reflow temperature ( ? C)
Volume (mm 3 )
< 350
350 to 2000
> 2000
< 1.6
1.6 to 2.5
> 2.5
260
260
250
260
250
245
260
245
245
Moisture sensitivity precautions, as indicated on the packing, must be respected at all
times.
Studies have shown that small packages reach higher temperatures during reflow
soldering, see Figure 22 .
PCU9955
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 2 October 2012
? NXP B.V. 2012. All rights reserved.
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