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LM2599: LM2599 in Lead-free reflow profile

Part Number: LM2599

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