Address,
At Hitachi we perform extensive reliability tests and with regards to
the medium to store components; the plastic tape is more susceptible to
ESD build up than paper tape and a charge can be transferred to the
PCBA during pick and place.
John Gulley
Hitachi Computer Products Division
email: [log in to unmask]
______________________________ Reply Separator _________________________________
Subject: RE: Murata Erie Changes
Author: JOHN GULLEY at HICAM-HDQ-OK
Date: 10/30/95 9:12 AM
Following from our pick n'place engineer at the EMPF in Indy:
1) non-marking of chip caps with a value code has always been the norm for
most vendors. As a user, I've appreciated the vendors who DID mark their
caps as it makes it easier to identify and inspect
2) As far as changing to all paper delivery media for their caps, yes you
are correct in the observation that it is "dirtier". The paper tapes
generate paper dust which accumulates somewhere, usually in the feeder drive
mechanism. Paper tape will deteriorate over time if not used quick enough
(12 months maybe). My experience has been if you have other choices for
delivery media (i.e. plastic of metal foil type,) have purchasing get that.
The slight increase in cost can be offset by less feeder maitenance and
reduced problems with improper feeding of tape through the feeders. As
paper tape ages the tendancy is for the "peel-back" tape to seperate from
the paper carrier and causes jamming in the feeder. This seperation can
also cause lost or dropped components and contributes to improper
component pickup by the head. If I were issuing specs for surface mount
components to purchasing and I had a choice between two vendors, one
offering choices other than paper, and one offering only paper, I would pick
the one with the options and justify the added expense with lower feeder
maintenance and lower operator handling problems.
You can contact the EMPF HelpLine at 317.226-5616 for additional discussion.
----------
From: TechNet-request
To: technet
Subject: Murata Erie Changes
Date: 25 Oct 95 2:52PM
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Date: Wed, 25 Oct 1995 14:52:44 -0500
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From: [log in to unmask] (Jeffery L. Hempton)
Subject: Murata Erie Changes
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--
Murata Erie has published a letter to all their customers through their
manufacturing representatives announcing that, in order to reduce production
costs and remain cost competitive through standardization, they intend to
implement the following changes to their ceramic chip capacitors effective
April 1,1996:
1. Discontinue all marking of ceramic capacitors. This is not totally
unexpected, as the 0603 and smaller sizes cannot be marked.
2) Discontinue all packaging tapes except paper for sizes 1206 and smaller.
Note:Other changes were stated, but these are the two that I would like to
address.
What I would like to ask readers of the forum, is:
A) What is the general concensus of Murata Erie discontinuing marking on SMD
chip caps?
B) Is Changing to paper tape only something the industry is leaning toward,
or is Murata Erie alone in this?Does this cause a problem with your feeder
unit allocations?
If all vendors followed suit, we would be required to purchase many more
paper tape-type feeders. Also, paper is a somewhat dirtier process.
Hope to get some feedback from others on these matters. Thanx!
Jeff L. Hempton
Magnavox Electronic Systems Company
--------------------------------------
Jeffery L. Hempton Phone: 219-429-7335
Mail Stop:25-31 Fax: 4688 Email: [log in to unmask]
MESC, 1313 Production Road, Fort Wayne, IN 46808
"And the men who hold high places, must be the ones who start,
To mould a new reality, closer to the heart.
Philosophers and Ploughmen, each must know his part,
To sow a new mentality, closer to the heart."--Rush-A Farewell to Kings.
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