reactance of 0805 and smaller SMT resistors

Charles Hill ([email protected])
Thu, 12 Jun 1997 22:04:15 -0600

Inductance is a property of a current loop, not a device. As such, the =
current return path is as important as the signal traces. An 0805 =
device mounted on the end of a coaxial cable has about 0.2nH of =
inductance; this would be a minimum figure. This inductance is =
increased on a PCB with the addition of vias and connections to the =
mounting pads. A smaller device will have less inductance but that is =
not as important as how the device is mounted, the trace lengths, and =
current return path.

Charles Hill, consultant
[email protected]