SLRS064B June 2014 – August 2016 ULN2003B
PRODUCTION DATA.
Thin traces can be used on the input due to the low current logic that is typically used to drive UNL2003B. Care must be taken to separate the input channels as much as possible, as to eliminate cross-talk. Thick traces are recommended for the output, in order to drive whatever high currents that may be needed. Wire thickness can be determined by the trace material's current density and desired drive current.
Since all of the channels currents return to a common emitter, it is best to size that trace width to be very wide. Some applications require up to 2.5 A.