PCA9505 NXP [NXP Semiconductors], PCA9505 Datasheet - Page 27

• Manufacturer Part Number: PCA9505
• Description: 40-bit I2C-bus I/O port with RESET, OE and INT
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCA9505_9506_3
Product data sheet
16.4 Reflow soldering
Key characteristics in reflow soldering are:
Table 12.
Table 13.
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
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
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 12
SnPb eutectic process (from J-STD-020C)
Lead-free process (from J-STD-020C)
and
Figure
13
22.
Rev. 03 — 6 June 2007
Package reflow temperature ( C)
Volume (mm
< 350
235
220
Package reflow temperature ( C)
Volume (mm
< 350
260
260
250
3
3
40-bit I
)
)
Figure
2
C-bus I/O port with RESET, OE and INT
350 to 2000
260
250
245
22) than a PbSn process, thus
220
220
350
PCA9505/06
> 2000
260
245
245
© NXP B.V. 2007. All rights reserved.
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