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NXP Semiconductors
PCA24S08A
1024 × 8-bit CMOS EEPROM with access protection
12.4 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 15 ) 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 10 and 11
Table 10.
SnPb eutectic process (from J-STD-020C)
Package thickness (mm)
Package reflow temperature ( ° C)
Volume (mm 3 )
< 350
≥ 350
< 2.5
≥ 2.5
Table 11.
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 15 .
PCA24S08A_1
? NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 01 — 19 January 2010
20 of 24
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