Example 1: quick document cross-check
Open the page next to a drawing, datasheet or marking when you need to confirm what a specific symbol, contact, protection code or table entry means before reading the full source document.
SpecCalc Hub
USB Pinout Reference
Simplified educational USB pinout reference.
Reference data
USB 2.0 Type-A (4)
Downstream receptacle, mating face, tongue above contacts: 1 left to 4 right. USB 2.0 only; extra USB 3 contacts are not shown.
Enlarged diagram
Selected contact: —
| Contact | Signal | Function |
|---|---|---|
| VBUS | Power | |
| D− | Data signal | |
| D+ | Data signal | |
| GND | Return / ground |
USB Type-C (24)
Receptacle mating face: A1 upper left, B12 lower left. Not a cable rear view.
Enlarged diagram
Selected contact: —
| Contact | Signal | Function |
|---|---|---|
| GND | Return / ground | |
| TX1+ | Data signal | |
| TX1− | Data signal | |
| VBUS | Power | |
| CC1 | Control / sideband | |
| D+ | Data signal | |
| D− | Data signal | |
| SBU1 | Control / sideband | |
| VBUS | Power | |
| RX2− | Data signal | |
| RX2+ | Data signal | |
| GND | Return / ground | |
| GND | Return / ground | |
| TX2+ | Data signal | |
| TX2− | Data signal | |
| VBUS | Power | |
| CC2 | Control / sideband | |
| D+ | Data signal | |
| D− | Data signal | |
| SBU2 | Control / sideband | |
| VBUS | Power | |
| RX1− | Data signal | |
| RX1+ | Data signal | |
| GND | Return / ground |
Contact references below do not establish viewing orientation. The mating face and wire side are mirror images. Match the exact plug/receptacle drawing before wiring; the diagram only groups functions.
What this page helps with
Distinguish USB 2.0 Type-A contacts from USB-C functional groups before comparing a device or cable drawing.
USB Pinout Reference is a public SpecCalc Hub reference page for pinouts, component markings and low-power electronics context. Simplified educational USB pinout reference.
The page is meant for transparent early-stage comparison: you can see the working inputs, the result context and the limitations without relying on a black-box answer.
Formula or method
The page is structured as a practical reference: start with the visible table, diagram and labels, then compare them with the exact connector, device, enclosure or symbol set in front of you.
Use the listed sources to confirm revision, naming and application context. Similar labels can hide different electrical limits, pin functions or test conditions, so the page should be treated as a guided reference rather than a universal standard text.
How to use
- Identify the exact symbol, connector, protection code or table entry you want to verify.
- Match the visible diagram and table with the label on the product, datasheet or drawing instead of assuming a familiar shape means the same thing.
- Check the current manufacturer document and local rules if the reference affects procurement, wiring or installation work.
Practical examples
Example 2: procurement or connection check
A familiar label can still hide a different revision or function. Use the page as a fast filter, then verify the exact document revision before you buy, connect or specify the real part.
Common mistakes
- Using the page without checking units, document revision or the real operating context.
- Treating a preliminary result or reference table as a final engineering decision.
- Ignoring the source links, limitations and related tools needed for the next validation step.
Limitations
- USB-C shape alone does not establish charging power, data speed or DisplayPort support. The functional illustration does not specify plug/receptacle viewing orientation.
- The page does not replace official manufacturer documentation, local rules or site measurements.
- Before practical use, confirm that the method matches the real equipment revision and operating conditions.
FAQ
What does the USB Pinout Reference page help with first?
It gives a transparent first pass for simplified educational usb pinout reference. and shows which inputs, assumptions or references should be checked before you move into a real decision.
Can I treat the result as a final decision?
No. Even a low-risk reference or calculation still needs to be checked against documentation, page limitations and the actual operating context.
What should I verify next?
Check the cited sources (USB-IF — USB 2.0 specification and USB-IF — Type-C cable and connector specification), the related tools and the real equipment or site data that will govern the final decision.
Related tools
Explanation updated: 2026-09-15
This calculator provides an estimate for informational purposes only. It is not a certified engineering design, electrical safety approval, or professional installation recommendation. Always verify final decisions with a qualified professional and applicable local codes.