USB Token Enclosure
The exposed pcb pads of J1 I think is not long enough. It should be long enough to penetrate a female usb connector. So you have to search for how deep they usually are
Thought for 34 sec
I’ll look up USB-A mating dimensions and compare them with the exposed length of J1 and the enclosure’s front edge. The important measurement is the unobstructed length from the PCB tip to the enclosure—not just the copper pad length.
Worked for 4 mins 42 sec
Your concern is justified: the PCB currently projects only 5.35 mm beyond the enclosure, while the USB-A drawing specifies at least 11.75 mm from the plug tip to its housing shoulder. I also found that J1’s contact pads appear outside the saved PCB outline, so shortening the enclosure alone would not resolve the connector geometry.
Worked for 4 mins 1 sec
Created a project doc
USB-A Mating Clearance
USB-A Mating Clearance
Finding
The current enclosure leaves only 5.35 mm of PCB exposed in the insertion direction. This is too short to accept on the basis of the standard USB-A plug envelope. The earlier check that plastic ends before a J1 footprint boundary was not a USB mating check and must not be treated as one.
No PCB, copper, component placement, routing or enclosure geometry was changed during this research.
Sources and verified dimension interpretation
Primary geometry: Universal Serial Bus Specification Revision 2.0, Chapter 6, printed page 95, Figure 6-7 (Series A receptacle interface and mating drawing), and printed page 99, Figure 6-9 (Series A plug interface drawing). [Full specification mirror](https://alsa.mirrorservice.org/datasheets/usb/usb_20.pdf...
You’re right: the PCB projects only 5.35 mm beyond the enclosure, while the USB-A plug drawing specifies 11.75 mm minimum from the plug tip to the housing shoulder—not copper pad length.
I recommend targeting 12 mm of exposed tongue, approximately 6.65 mm more, while keeping the electronics covered; J1’s conflicting pad/outline coordinates must be resolved before changing the PCB, as detailed in USB-A Mating Clearance.
Should I proceed with that USB tongue revision and refit the enclosure around it?
Waiting for input
