PCF8576DTSLASH2 datasheet(47/52 Pages) NXP

47 / 52 page

PCF8576D_7

Product data sheet

Rev. 7 — 18 December 2008

47 of 52

NXP Semiconductors

PCF8576D

Universal LCD driver for low multiplex rates

• Solder paste printing issues, such as 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) while being 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 24

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 Figure 32.

For further information on temperature proﬁles, refer to application note

AN10365

“Surface mount reﬂow soldering description”.

18.3.1 Stand off

The stand off between the substrate and the chip is determined by:

• The amount of printed solder on the substrate

• The size of the solder land on the substrate

Table 25.

Lead-free process (from J-STD-020C)

Package thickness (mm)

Package reﬂow temperature (

°C)

Volume (mm3)

< 350

350 to 2000

> 2000

< 1.6

260

1.6 to 2.5

260

250

245

> 2.5

250

245

MSL: Moisture Sensitivity Level

Fig 32. Temperature proﬁles for large and small components

001aac844

temperature

time

minimum peak temperature

= minimum soldering temperature

maximum peak temperature

= MSL limit, damage level

peak

temperature

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