pca9545ad NXP Semiconductors, pca9545ad Datasheet - Page 24

• Manufacturer Part Number: pca9545ad
• Description: 4-channel I2c Switch With Interrupt Logic And Reset
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA9545A_45B_45C_6
Product data sheet
14.4 Reflow soldering
Key characteristics in reflow soldering are:
Table 10.
Table 11.
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
Package thickness (mm)
< 2.5
Package thickness (mm)
< 1.6
1.6 to 2.5
> 2.5
•
•
•
2.5
Lead-free versus SnPb soldering; note that a lead-free reflow process usually leads to
higher minimum peak temperatures (see
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
SnPb eutectic process (from J-STD-020C)
Lead-free process (from J-STD-020C)
and
Figure
11
25.
Rev. 06 — 19 March 2007
Package reflow temperature ( C)
Volume (mm
< 350
235
220
Package reflow temperature ( C)
Volume (mm
< 350
260
260
250
4-channel I
3
3
)
)
2
C-bus switch with interrupt logic and reset
Figure
PCA9545A/45B/45C
350 to 2000
260
250
245
25) than a PbSn process, thus
220
220
350
> 2000
260
245
245
© NXP B.V. 2007. All rights reserved.
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