CBTW28DD14

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© NXP Semiconductors N.V. 2014. All rights reserved.

Product data sheet

Rev. 5 — 28 May 2014

8 of 13

NXP Semiconductors

CBTW28DD14

14-bit bus switch/multiplexer for DDR2/DDR3/DDR4 applications

13.4 Reflow soldering

Key characteristics in reflow soldering are:

higher minimum peak temperatures (see Figure 5) than a SnPb process, thus

reducing the process window

window for a mix of large and small components on one board

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 9 and 10

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 5.

Table 9.

SnPb eutectic process (from J-STD-020D)

Package thickness (mm)

Package reflow temperature (

C)

< 350

 350

< 2.5

235

220

 2.5

220

220

Table 10.

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

Package thickness (mm)

Package reflow temperature (

C)

< 350

350 to 2000

> 2000

< 1.6

260

260

260

1.6 to 2.5

260

250

245

> 2.5

250

245

245