[sdiy] Low aspect ratio SMD parts? ("pancake" shaped flat parts)

cheater cheater cheater00social at gmail.com
Tue Feb 7 04:50:18 CET 2023


Hi all,
if you want to modify an SMD circuit by adding a component in series
with another component, then you can obviously lift one side of the
existing component, and squeeze in another one between that and the
pad. For example, if you have a ceramic smd package capacitor, and you
want to add a series resistor, you can lift one side of the capacitor
(essentially desolder the capacitor and resolder it in a tombstone
configuration) and then put the resistor on the free pad, then bridge
the two sides of the parts that are up in the air.

However, that's not always possible. Sometimes there isn't enough
vertical space for this, or maybe you have a larger smd part that
needs stability, or you have a part that needs to go in series under
one lead of a SOT package or a ribbon connector.

What you'd want at that point is eg a resistor that has the footprint
of a single smd pad, and it's basically a layer of metal (for
soldering) at the bottom, then a flat pancake of resistive material,
then another layer of metal. With the operative being that it should
be flat and wide, like a pancake. Hence "low aspect ratio".

I was wondering if anyone has ever seen parts like that?

Cheers


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