Dear Sir,
since 10 years ago, we use voltage regulator LM2599 in 2 versions :
- LM2599SX-5.0/NOPB
- LM2599SX-ADJ/NOPB
These réfs are soldered on our PCB in a leaded reflow profile ( T peak < 220 °C ) without any problem…
For a new design, we have to use a lead-free reflow profile with a SAC305 solder paste.
The results are conform for all smd devices on the board, except for the LM2599 :
The D2PAK package have brown pins after reflow, but only on SAC305 process ( see photos, and reflow profile ).
As specified in the LM2599 ordering code, Lead finish is CU SN.
- Is this phenomen normal ?
- Why this fault appears only on LM2599 package ?
Thanks for your answer.
Best regards
LM2599 Ordering Code.pdfReflow Profile SAC305.pdf
Jean-Pierre Mérienne
Mail : jpmerienne@hydequip.fr
Tél : 02.31.22.85.15
Fax : 02.31.22.85.07
Route d'Audrieu
14400 Bayeux