Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Lead-free profile for big electrolytic cap

Views: 3432


Roy

#51695

Lead-free profile for big electrolytic cap | 7 September, 2007

We are having problem to develop lead-free (SAC305) reflow profile for big SMT electrolytic caps. The delta T of the joint of the cap with the rest of the board is too big to fit in the tighter lead-free window. Any suggestions regarding the total profile time, soak time, board/pad design, or any thing else? Thanks

reply »

#51696

Lead-free profile for big electrolytic cap | 7 September, 2007

Change to through hole or hand solder. we are in the same boat and have not foound a reflow solution.

James

reply »

#51707

Lead-free profile for big electrolytic cap | 10 September, 2007

Good afternoon,

What is the difference between your cap and the rest of the PWB?

BR, Pavel

reply »


Roy

#51708

Lead-free profile for big electrolytic cap | 10 September, 2007

About 25C difference between the cap joint and the small ICs.

reply »


RDR

#51718

Lead-free profile for big electrolytic cap | 10 September, 2007

Can you implement a longer soak? how many feet of heat do you have in oven?

Russ

reply »

#51724

Lead-free profile for big electrolytic cap | 10 September, 2007

How big is the cap ? We successfully reflow caps that measure aprrox .750" x 750" at the base and are .678" tall.

The ovens we use are Vitronics XPM's.(1230,1040 and 930) We also process these caps through our Omniflow 10.

As stated, oven length will definitely be a factor. You will have to most likely set up an extended soak profile.

reply »

#51731

Lead-free profile for big electrolytic cap | 11 September, 2007

Good afternoon,

Oops. Quite huge difference I must say. But you should try to tweak your profile anyway. First of all try to enlarge soak time as Mr. RDR has said. What process type do you use? Lead or lead-free? By the way, there are lead-free process materials on the market supporting RSS (ramp-soak-spike) profile. Do you have automatic profiling equipment?

BR, Pavel

reply »

PCB equipment

Reflow Oven