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TFA9896 Datasheet(PDF) 16 Page - NXP Semiconductors |
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TFA9896 Datasheet(HTML) 16 Page - NXP Semiconductors |
16 / 22 page NXP Semiconductors TFA9896 Boosted audio system with adaptive sound maximizer and speaker protection TFA9896 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved. Product short data sheet Rev. 1 — 22 December 2016 COMPANY PUBLIC 16 / 22 14 Soldering of WLCSP packages 14.1 Introduction to soldering WLCSP packages This text provides a very brief insight into a complex technology. A more in-depth account of soldering WLCSP (Wafer Level Chip-Size Packages) can be found in application note AN10439 “Wafer Level Chip Scale Package” and in application note AN10365 “Surface mount reflow soldering description”. Wave soldering is not suitable for this package. All NXP WLCSP packages are lead-free. 14.2 Board mounting Board mounting of a WLCSP requires several steps: 1. Solder paste printing on the PCB 2. Component placement with a pick and place machine 3. The reflow soldering itself 14.3 Reflow soldering Key characteristics in reflow soldering are: • Lead-free versus SnPb soldering; note that a lead-free reflow process usually leads to higher minimum peak temperatures (see Figure 1) than a SnPb process, thus reducing the process window • 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 8. Table 8. Lead-free process (from J-STD-020D) Package reflow temperature (°C) Volume (mm3) Package thickness (mm) < 350 350 to 2000 > 2000 < 1.6 260 260 260 1.6 to 1.5 260 250 245 > 2.5 250 245 245 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 7. |
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