PCA9540BGD NXP [NXP Semiconductors], PCA9540BGD Datasheet - Page 18

• Manufacturer Part Number: PCA9540BGD
• Description: 2-channel I2C-bus multiplexer
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCA9540B_4
Product data sheet
13.4 Reflow soldering
Key characteristics in reflow soldering are:
Table 8.
Table 9.
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 8
SnPb eutectic process (from J-STD-020C)
Lead-free process (from J-STD-020C)
and
Figure
9
Rev. 04 — 3 September 2009
19.
Package reflow temperature ( C)
Volume (mm
< 350
235
220
Package reflow temperature ( C)
Volume (mm
< 350
260
260
250
3
3
)
)
Figure
350 to 2000
260
250
245
19) than a SnPb process, thus
2-channel I
220
220
350
PCA9540B
> 2000
260
245
245
2
C-bus multiplexer
© NXP B.V. 2009. All rights reserved.
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