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September 2004

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Subject:
From:
"Janoch Jiří, Ing." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Janoch Jiří, Ing.
Date:
Wed, 29 Sep 2004 11:33:55 +0200
Content-Type:
text/plain
Parts/Attachments:
text/plain (65 lines)
Hi,
we use PCB ENIG surface for tiny components but I would say that PCB tin
surface does not influence on LED function.

J.Janoch, Des. Dpt.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Prasad AN
Sent: Wednesday, September 29, 2004 10:14 AM
To: [log in to unmask]
Subject: [TN] Reliability issue in 0402 soldering

Hi all

We are assembling around 750 # of 0402 size LEDs in small PCB of size
65mm X
65mm.

The problem we are having after reflow, when PCB is tested all the LEDs
are
glowing.

But after some time the problem starts with 3-4 LEDs not glowing.

The PCB surface is of  Tin plating.

Let me know is the PCB surface is suitable for this type of board. If
not
what type of surface is recommended for PCB with only 0402 LEDs.


Thanks with Warm regards

A.N.Prasad




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