LM2903B-Q1: Regarding metal plating in dimple point of wettable flank

Yusuke Kawate

Prodigy 150 points

Part Number: LM2903B-Q1

Dear Team,

I have a question for wettable flank plating.

Regarding LM2903BWDSGRQ1, dimple point of wettable flank is metal pleated ?

I saw below URL page, it says dimple point is step-cut and then re-plated.

Is it same as LM2903BWDSGRQ1 ?

Best regards,

Yusuke Kawate

TED

over 1 year ago

0 Yusuke Kawate over 1 year ago

Prodigy 150 points

Dear Team,

I'm sorry for missing to paste URL.

The value of wettable flank-plated QFN packaging for automotive applications - Automotive - Technical articles - TI E2E support forums

I saw above URL about wettable flank.

Would you kindly let me know about my question ?

Sincerely,

Yusuke Kawate

0 Clemens Ladisch over 1 year ago

Guru 282750 points

All surfaces that need to be soldered are plated. (Exposed copper can oxidize and would prevent solder wetting.)

The purpose of the dimple is to catch solder, so it is plated.

0 Paul Grohe over 1 year ago

TI__Guru 53846 points

Hello Yusuke,

I assume it is plated.. As Clemens said, exposed copper can oxidize and lead to a poor solder joint....but let me double-check with the experts.

+1 Paul Grohe over 1 year ago in reply to Yusuke Kawate

TI__Guru 53846 points

Hello Yusuke,

Yes. It is plated.

0 Yusuke Kawate over 1 year ago in reply to Paul Grohe

Prodigy 150 points

Hello Paul,

Thank you very much for your kind reply.

I understand.

Best regards,

0 Yusuke Kawate over 1 year ago in reply to Clemens Ladisch

Prodigy 150 points

Dear Mr. Ladisch,

Thank you for your kind explanation.

I understand the purpose of the dimple.

Sincerely,

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

Amplifiers

Amplifiers forum

LM2903B-Q1: Regarding metal plating in dimple point of wettable flank