lpc2917 NXP Semiconductors, lpc2917 Datasheet - Page 61

• Manufacturer Part Number: lpc2917
• Description: Arm9 Microcontroller With Can And Lin
• Manufacturer: NXP Semiconductors

NXP Semiconductors
Table 34.
LPC2917_19_1
Preliminary data sheet
Mounting
Through-hole mount
Through-hole-surface
mount
Suitability of IC packages for wave, reflow and dipping soldering methods
14.3.3 Manual soldering
14.4 Package related soldering information
To overcome these problems the double-wave soldering method was specifically
developed.
If wave soldering is used the following conditions must be observed for optimal results:
During placement and before soldering, the package must be fixed with a droplet of
adhesive. The adhesive can be applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the adhesive is cured.
Typical dwell time of the leads in the wave ranges from 3 seconds to 4 seconds at 250 qC
or 265 qC, depending on solder material applied, SnPb or Pb-free respectively.
A mildly-activated flux will eliminate the need for removal of corrosive residues in most
applications.
Fix the component by first soldering two diagonally-opposite end leads. Use a low voltage
(24 V or less) soldering iron applied to the flat part of the lead. Contact time must be
limited to 10 seconds at up to 300 qC.
When using a dedicated tool, all other leads can be soldered in one operation within
2 seconds to 5 seconds between 270 qC and 320 qC.
Package
CPGA, HCPGA
DBS, DIP, HDIP, RDBS, SDIP, SIL
PMFP
•
•
•
Use a double-wave soldering method comprising a turbulent wave with high upward
pressure followed by a smooth laminar wave.
For packages with leads on two sides and a pitch (e):
– larger than or equal to 1.27 mm, the footprint longitudinal axis is preferred to be
– smaller than 1.27 mm, the footprint longitudinal axis must be parallel to the
The footprint must incorporate solder thieves at the downstream end.
For packages with leads on four sides, the footprint must be placed at a 45q angle to
the transport direction of the printed-circuit board. The footprint must incorporate
solder thieves downstream and at the side corners.
[4]
parallel to the transport direction of the printed-circuit board;
transport direction of the printed-circuit board.
[1]
Rev. 1.01 — 15 November 2007
Soldering method
Wave
suitable
suitable
not suitable
[3]
ARM9 microcontroller with CAN and LIN
Reflow


not suitable
LPC2917/19
[2]
© NXP B.V. 2007. All rights reserved.
Dipping

suitable

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