I am designing a product that needs a USB connection to a PC.
The case is made from ABS and has some connectors already decided, they are plastic quick connect types like this, in different colours and pin counts.
I just have the USB connector to go.
I can either go for this type:
which is obviously a standard USB mini connector.
- standard USB connector means a standard USB cable can be used
- includes shielding against EMI
- Milling the enclosure requires high precision and the PCB must be slid sideways during assembly
- The connector needs to be fitted onto a tiny PCB and connected to the main PCB using a cable (FFC with ground between each wire)
Alternatively I can use something like a 4-pin connector Redel like the first picture
- Same look as the other connectors (but different colour and pin count)
- Easy to mill hole in the enclosure
- The other connectors will use a connector board, which can then be shared if designed well
- Not shielded
- Requires a custom cable at one end (but very simple to make, solder 4 wires…this is not a volume product, and other cables need to made anyway)
What I would like to ask the community here is this: what kind of connector can be used for a 48 MHz USB signal while observing electromagnetic compatibility regulations? Does it have to be USB with shielding, or can it be an industrial 4-pin connector? If the enclosure is plastic - does it matter if the connector is metal or plastic as a metal housing won’t be electrically connected anyway?
Thanks for any insights!