Electronics shop PCB guidelines

Eagle Design Guidelines:

Mechanical:

PCB sizes tend to be 3x4", 4x6" or 6x9" - please allow for 1/4" inch all around, with an additional pair of opposite sides having 1/2" clearance from the sides

Electrical:

For current-carrying power and ground traces, it is recommended to use >= 40 mils (1.016mm)

For signal traces, it is recommended to use >= 32 mils (.8128mm)

For headers and other connections, route away from the connection before turning, in order to allow for proper clearance:

If there is a need for a smaller trace (ex: due to a part not available in a large package), make sure to always use above 10 mils (.254mm) and enlarge the trace as soon as possible:

Note that for such precise designs, it may not be possible to fabricate perfectly, and expect to need to manually fix any errors with either a xacto knife or a small jumper wire.

Layers:

The electronics shop can only fabricate 2-layer boards. It also will only make the copper layer, i.e. there will not be any text layer or solder mask. Plan accordingly, such as by using thermals to ensure ease of soldering.

Drill sizes: The following drill sizes are available:

.4mm, .5mm, .6mm, .7mm .8mm, 1mm, 1.2mm, 1.4mm, 1.5mm, 1.8mm, and 2mm. Larger size holes are OK, and will be done via routing. Do not have any holes in pads (vias are OK).

Vias:

Do not rely on any through-hole pins to function as a via, explicitly create a 2nd via and be prepared to solder a wire through it to ensure a good connection: