Re: [SI-LIST] : Boston area IPC/DC mtg, 24-Apr 6pm

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From: GARY ROSEN ([email protected])
Date: Wed Apr 18 2001 - 16:07:02 PDT

"Smith, Norm W" wrote:

> Bruce Mahler, Vice President of Ohmega Technologies Inc, will
> present a talk on planar (buried) resistors and their benefits
> in today's space and performance constrained world. While BC
> capacitance has been well discussed in our group, this mature
> technology represents the next step for reducing attached part
> count and complexity. In use for over 20 years, Ohmega resis-
> tor technology claims cost benefits when replacing soldered
> components at as few as 3 or 4 resistors per board square inch.
> Just wanted to share my comments on this technology. We're currently using
> this buried resistor technology for series-source termination on a large IO
> BGA. The big benefit for us was being able to get the resistors very close
> to the BGA balls. However, the negatives are that the board has a >25% cost
> adder and very few PCB vendors can process it. We're in the process of
> taking the buried resistor technology out and replacing with discrete 0401
> SMT resistors, since our assembler can now place these ultra-small
> resistors.

Is that actually 0401, not a typo? If not, who makes them? I've used 0402 and
heard of 0201 (but don't know a vendor).

- Gary Rosen

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