PCA9552_06 PHILIPS [NXP Semiconductors], PCA9552_06 Datasheet - Page 23

• Manufacturer Part Number: PCA9552_06
• Description: 16-bit I2C-bus LED driver with programmable blink rates
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
14. Handling information
15. Soldering
PCA9552_5
Product data sheet
15.1 Introduction to soldering surface mount packages
15.2 Reflow soldering
15.3 Wave soldering
Inputs and outputs are protected against electrostatic discharge in normal handling.
However, to be completely safe you must take normal precautions appropriate to handling
integrated circuits.
This text gives a very brief insight to a complex technology. A more in-depth account of
soldering ICs can be found in our Data Handbook IC26; Integrated Circuit Packages
(document order number 9398 652 90011).
There is no soldering method that is ideal for all surface mount IC packages. Wave
soldering can still be used for certain surface mount ICs, but it is not suitable for fine pitch
SMDs. In these situations reflow soldering is recommended.
Reflow soldering requires solder paste (a suspension of fine solder particles, flux and
binding agent) to be applied to the printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement. Driven by legislation and
environmental forces the worldwide use of lead-free solder pastes is increasing.
Several methods exist for reflowing; for example, convection or convection/infrared
heating in a conveyor type oven. Throughput times (preheating, soldering and cooling)
vary between 100 seconds and 200 seconds depending on heating method.
Typical reflow peak temperatures range from 215 C to 270 C depending on solder paste
material. The top-surface temperature of the packages should preferably be kept:
Moisture sensitivity precautions, as indicated on packing, must be respected at all times.
Conventional single wave soldering is not recommended for surface mount devices
(SMDs) or printed-circuit boards with a high component density, as solder bridging and
non-wetting can present major problems.
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:
•
•
below 225 C (SnPb process) or below 245 C (Pb-free process)
– for all BGA, HTSSON..T and SSOP..T packages
– for packages with a thickness
– for packages with a thickness < 2.5 mm and a volume
below 240 C (SnPb process) or below 260 C (Pb-free process) for packages with a
thickness < 2.5 mm and a volume < 350 mm
thick/large packages.
Rev. 05 — 9 March 2006
16-bit I
2
C-bus LED driver with programmable blink rates
2.5 mm
3
so called small/thin packages.
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
350 mm
PCA9552
3
so called
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