위 여자는 벨빌에 일하고 자주 테그넷에 등장함
 지난번 내가 메일 띄워 인사를 한바 있음. OSP도 그여자가 담당하나보죠 ?





Bev Christian <[log in to unmask]> on 99-09-15 06:13:03 AM

까지 "TechNet E-Mail Forum." <[log in to unmask]>에게 회신하여 주십시오.; 까지 Bev Christian
      <[log in to unmask]>에게 회신하여 주십시오.


TO:      [log in to unmask]
CC:       (비밀참조인: 이진호/DAEDUCK)
SUBJECT: Re: [TN] Baking SOIC packages to dry them prior to reflow solder




Al,
Those are old parts.  Hmmm.   Although weight loss studies I have done and
have seen from vendors show most of the moisture leaves components within
the first four hours, these investigations have not been with parts that
have had the possibility to suck up moisture for five years. (Well they
wouldn't be doing it continuously.)  I personally would be a whole lot more
comfortable with a 24 hour temperature soak, at the temperature you
mentioned.  I would expect that at this temperature you should be OK with
respect to growth of surface oxide, unless of course you are right on the
hairy edge of your pass/fail criteria for solderability.  I would also be
inclined to use them as soon as possible after they come out of the oven, as
I have no idea how susceptible the particular SOICs you have are to moisture
pick-up.

regards,
Bev Christian
Nortel Networks


> -----Original Message-----
> From: Alan Shaw [SMTP:[log in to unmask]]
> Sent: Tuesday, September 14, 1999 4:34 PM
> To:   [log in to unmask]
> Subject:      [TN] Baking SOIC packages to dry them prior to reflow solder
>
> I have 5 year old plastic SOIC packages on reels and want to dry them out
> in
> an oven rather than leave it to the pre-heat of the reflow solder machine.
> Production asked for temperature and time for the SOIC to be in the oven.
> My initial thoughts are to put them in a cold oven and set the thermostat
> to
> 110'C and leave them baking for 4 hours. Then turn off the oven. Remove
> them
> when cool and use in the insertion machines the next day.
> Is the temperature and time suitable?
>
> The leads have passed a solderability test already, would the time in the
> oven have a significant effect on solderabitiy?
>
> Al Shaw
> ashaw at napcosecurity dot com
>
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