LISTSERV - TECHNET Archives - LISTSERV.IPC.ORG

TECHNET Archives

November 1998

TechNet@IPC.ORG

	LISTSERV Archives
	TECHNET Home
	TECHNET November 1998

	Log In
	Register

	Subscribe or Unsubscribe

	Search Archives

Options:	Use Monospaced Font Show Text Part by Default Show All Mail Headers
Message:	[<< First] [< Prev] [Next >] [Last >>]
Topic:	[<< First] [< Prev] [Next >] [Last >>]
Author:	[<< First] [< Prev] [Next >] [Last >>]

Subject:	Re: QFP leadframe tin-lead finish
From:	Ahne Oosterhof <[log in to unmask]>
Reply To:	[log in to unmask]
Date:	Tue, 17 Nov 1998 17:09:13 -0800
Content-Type:	text/plain
Parts/Attachments:	text/plain (55 lines)

I believe Signetics was folded into the semiconductor portion of  "Philips
Gloeilampenfabrieken", which is now spelled "Philips Electronics", the same
guys that make all kinds of SMT equipment (and parts).

"Deja vue" , from French: "already seen".

And what was the last question?

Regards, Ahne Oosterhof, A-Laser.
(503)641-9428

-----Original Message-----
From:   TechNet [mailto:[log in to unmask]] On Behalf Of [log in to unmask]
Sent:   Tuesday, November 17, 1998 15:53 PM
To:     [log in to unmask]
Subject:        [TN] QFP leadframe tin-lead finish

Back in the "good old days"  (1980 something) there was a company named
Signetics. Who are
they now? Anyway, they tin/lead plated and reflowed all component leads.
What incredible
solderability!

Life was good. Then came tin immersion, oxidation, poor solderability, and
unacceptable solder
joints. Oh the stories I could tell and the pictures that could be shown.
NCR hide your face
in shame.

Again, history repeats. What's the term - Dejavu (how is it spelled?) all
over again.

Solder solders to solder when the right stuff comes together in a process
managed capability
(heat, flux, speed, and all that stuff). Of course, there must be little
oxidation. That's why
tin/lead plating is good but great when reflowed - but the bumps caused all
the other problems
as a surface not acceptable to surface mount technology and environmental
issues - or is there
a way?
Earl Moon

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################

ATOM RSS1 RSS2

LISTSERV.IPC.ORG