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| From [log in to unmask] Sat Apr 27 14: |
34:50 1996 |
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A buried resistor is an extremely thin coating of nickel
phosphorous deposited onto copper foil. The copper foil is
laminated onto B-staged laminate to form a copper clad core.
The core is processed (etched) to define circuitry/plane images.
(through copper and NI/P) The same layer is then re-imaged to expose
only resistor areas. They are then selectively etched of only surface
copper to expose Ni/P below. The Ni/P values work on the same
principal to ohms per square. The square size depends on the desired
watts. Once completed, the whole multilayer composite is laminated
together to form a MLB PCB.
Hadco Printed Circuits
Tech Center Two / Watsonville
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Dave Hoover
Senior Process Engineer
[log in to unmask]
______________________________ Reply Separator _________________________________
Subject: What is a buried resistor ?
Author: [log in to unmask] at SMTPLINK-HADCO
Date: 8/15/95 4:13 PM
I am unfamiliar with this term, can someone explain ?
Mitra Geeban
PCB Designer
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