USB C Part Review
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Created a project doc
Part Review - 12401899E412A
Date: 2026-07-17 Current Flux part project: silicon-yard/12401899e412a
Finished the review and created Part Review - 12401899E412A. I set the part project’s Datasheet URL to Amphenol’s official C12401899 drawing and found no hard mismatch in the 24 USB-C electrical pinout or signal pad geometry.
Open items:
- Metadata is incomplete: Manufacturer Name, Part Type, clean description, package/mounting details, and per-pin descriptions should be populated.
- Footprint has 2 unassigned mechanical pads likely corresponding to locating/hold-down features; verify visually against the drawing before manufacturing.
Suggested next steps:
- Ask me to update the missing metadata and pin descriptions.
- Ask me to visually inspect/repair the 2 unassigned mechanical pads.
- Ask me to prepare the part for publishing/manufacturing use.
Fix metadata and pads
Update part metadata
Inspect mechanical pads
Run part checks
Prepare for publishing
Refine this doc
Ask about this doc
Part Review - 12401899E412A
Date: 2026-07-17
Sources reviewed
- Current Flux part project:
silicon-yard/12401899e412a - Official Amphenol customer drawing: https://cdn.amphenol-cs.com/media/wysiwyg/files/drawing/c12401899.pdf
- Official Amphenol USB Type-C receptacle product specification: https://cdn.amphenol-cs.com/media/wysiwyg/files/documentation/usb_type_c_receptacle_product_specification_a.pdf
- Amphenol product page/search result metadata for
12401899E412A - Distributor metadata from JLCPCB and third-party catalog pages for cross-reference only
Property update performed
The part project did not have a populated datasheet property at the start of review. I set the project-level
Datasheet URL property to the official Amphenol customer drawing:The part now queries successfully against that drawing in Flux. Note: the Flux library search index may still show
has_datasheet=false or an empty Datasheet URL briefly until the component search index refreshes.Current Flux metadata observed
Table
| Field | Current value / observation | Datasheet or official-source comparison | Status |
|---|---|---|---|
| Project / part name | 12401899E412A | Matches MPN | OK |
| Manufacturer Part Number | 12401899E412A | Matches drawing part-number family 12401899XX12A; E4 plating, reel package, HF/date-code suffix map to 12401899E412A | OK |
| Manufacturer Name | Blank in library result; description says Amphenol ICC | Official manufacturer is Amphenol ICC / Amphenol Communications Solutions | Metadata missing |
| Designator Prefix | J | Appropriate for connector | OK |
| Part Type | Blank in library result; terminal subcomponents are Terminal | Should be Connector / USB Type-C receptacle | Metadata missing |
| Existing description | 3 / Manufacturer Recommendation / Amphenol ICC / 3.4 mm / KARTHIK | Official description is USB3.2 Gen2 Type-C receptacle, top mount, center height 1.75 mm, dual-row SMT, IP-rated/waterproof | Description should be cleaned up |
| Datasheet URL | Set during review to Amphenol C12401899 drawing | Official source PDF | OK after update |
| Flux terminal count | 34 schematic terminal components | Datasheet has 24 electrical USB contacts plus shell/hold-down features | Acceptable if shield/mount tabs are intentionally exposed |
| PCB pad count | 36 PCB pads | 24 signal pads + exposed shield/hold-down pads + 2 unassigned mechanical mount/locating pads observed | Generally plausible; see notes |
| Package / mounting | No explicit package property observed | Official: right-angle/top-mount USB-C receptacle, dual-row SMT signal contacts, shell/hold-down posts, height about 3.40 mm, center height 1.75 mm | Metadata missing |
Key datasheet specifications
Table
| Parameter | Value |
|---|---|
| Connector type | USB Type-C receptacle |
| USB generation / speed | USB 3.1/3.2 Gen 2, 10 Gb/s |
| Orientation | Right angle, top mount |
| Electrical contacts | 24 contacts: A1-A12, B1-B12 |
| Termination | Dual-row SMT for signal contacts; shell/hold-down/mechanical features present |
| Signal pad pitch | 0.50 mm |
| Signal pad size | 0.30 mm x 0.70 mm, 24 places |
| Signal pad row span | 11 x 0.50 = 5.50 mm |
| Recommended PCB layout tolerance | +/-0.05 mm |
| Current rating | 5 A max for VBUS/GND contacts per Amphenol spec |
| Voltage / withstand | 100 VAC dielectric withstand for 1 minute; product spec lists 100 VAC rating context |
| Low-level contact resistance | 40 mOhm max initial |
| Insulation resistance | 100 MOhm min |
| Durability | 10,000 mating cycles |
| Operating temperature | -40 C to +85 C from product specification |
| Materials | High-temperature thermoplastic housing, copper-alloy contacts, stainless/copper-alloy plated shell/shield, UL94 V-0 |
| Plating for E4 suffix | 30 uin gold mating area, 100 uin matte tin solder area, 50 uin nickel underplating |
Pin assignment cross-check
The Flux schematic uses terminal designators as signal names and stores the physical pin in the
Pin Number property. The 24 USB electrical contacts match the datasheet pin table.Table
| Datasheet pin | Datasheet signal | Flux terminal | Status |
|---|---|---|---|
| A1 | GND | GND_A | OK |
| A2 | TX1+ | TX1+ | OK |
| A3 | TX1- | TX1- | OK |
| A4 | VBUS | VBUS_A | OK |
| A5 | CC1 | CC1 | OK |
| A6 | D+ | D1+ | OK; naming distinguishes side A USB2 contact |
| A7 | D- | D1- | OK; naming distinguishes side A USB2 contact |
| A8 | SBU1 | SBU1 | OK |
| A9 | VBUS | VBUS_A__1 | OK |
| A10 | RX2- | RX2- | OK |
| A11 | RX2+ | RX2+ | OK |
| A12 | GND | GND_A__1 | OK |
| B12 | GND | GND_B__1 | OK |
| B11 | RX1+ | RX1+ | OK |
| B10 | RX1- | RX1- | OK |
| B9 | VBUS | VBUS_B__1 | OK |
| B8 | SBU2 | SBU2 | OK |
| B7 | D- | D2- | OK; naming distinguishes side B USB2 contact |
| B6 | D+ | D2+ | OK; naming distinguishes side B USB2 contact |
| B5 | CC2 | CC2 | OK |
| B4 | VBUS | VBUS_B | OK |
| B3 | TX2- | TX2- | OK |
| B2 | TX2+ | TX2+ | OK |
| B1 | GND | GND_B | OK |
| Shell | GND / shield | SHIELD, SHIELD__1 ... SHIELD__9 | OK as exposed shell/hold-down terminals, but descriptions should clarify individual mechanical pads |
Footprint cross-check
Signal contacts
The PCB footprint signal pads appear consistent with the official recommended PCB layout:
- 24 signal pads are present and mapped to A1-A12 and B1-B12.
- Signal pad size in the layout is 0.30 mm x 0.70 mm after normalizing the displayed imported footprint units.
- Horizontal pitch is 0.50 mm.
- A-row span is 5.50 mm from A1 to A12.
- B-row span is 5.50 mm from B12 to B1.
- The A/B row ordering matches the datasheet pin table when read from the footprint coordinates:
- A row: A1 GND, A2 TX1+, A3 TX1-, A4 VBUS, A5 CC1, A6 D+, A7 D-, A8 SBU1, A9 VBUS, A10 RX2-, A11 RX2+, A12 GND.
- B row: B12 GND, B11 RX1+, B10 RX1-, B9 VBUS, B8 SBU2, B7 D-, B6 D+, B5 CC2, B4 VBUS, B3 TX2-, B2 TX2+, B1 GND.
Shell and mechanical features
- The schematic exposes 10 shield-related terminals:
SHIELD,SHIELD__1throughSHIELD__9. - The PCB layout contains those 10 shield pads plus 2 additional pads with designator
Noneunder the mounts container. - The 2 unassigned pads are likely mechanical locating/hold-down features from the imported footprint. They are not necessarily electrical terminals, but they should be visually checked against the drawing before manufacturing.
Symbol and pin-description review
Table
| Area | Finding | Severity |
|---|---|---|
| Symbol pin identity | All 24 USB contact pin numbers and signal names match the datasheet. | Pass |
| Shell representation | Shell/hold-down tabs are represented as multiple terminals rather than one generic shell pin; acceptable for layout control. | Pass / note |
| Pin Description property | No Pin Description property was observed on the terminal components; the function is only encoded in the designator and Pin Number. | Metadata issue |
| Pin Type property | Signal pins are Bi-Directional, shield pins are Passive, VBUS/GND are Power In. For a connector library part, Passive/Power may be preferable depending on ERC style; current typing is not a datasheet mismatch but may create ERC assumptions. | Advisory |
| Part-level metadata | Manufacturer Name, Part Type, and explicit package/mounting metadata are blank or not present in the library result. | Metadata issue |
| Description | Current description is not a clean official part description. | Metadata issue |
Mismatches and recommended fixes
No hard pinout mismatch found
I did not find a mismatch in the 24 USB electrical contacts: the schematic pin numbers, names, and footprint signal pad order agree with the Amphenol pin assignment.
Metadata issues to fix
- Populate
Manufacturer NamewithAmphenol ICCorAmphenol Communications Solutions. - Populate
Part TypeasConnector/USB Type-C receptacleif the library/property model supports it. - Replace the current description with a clean official-style description, for example:
USB 3.2 Gen 2 Type-C receptacle, top mount/right-angle, 24 contacts, dual-row SMT, IP-rated, 3.40 mm height, 1.75 mm center height.
- Add per-terminal
Pin Descriptionvalues, especially for duplicate USB2/VBUS/GND contacts and shield tabs. - Consider changing connector terminal
Pin Typevalues to a more connector-oriented scheme if ERC behavior matters: signal contacts as bidirectional/passive, VBUS/GND as passive or power pins per project convention, shield tabs as passive. - Confirm the 2 unassigned mechanical mount pads in the footprint are intentionally unconnected mechanical features and match the drawing before ordering boards.
Review conclusion
The core electrical pinout and signal-pad footprint geometry appear correct for Amphenol 12401899E412A. The main problems are incomplete/unclean part metadata and missing pin-description fields, not a pinout or signal-footprint mismatch.
Sources reviewed
Property update performed
Current Flux metadata observed
Key datasheet specifications
Pin assignment cross-check
Footprint cross-check
Signal contacts
Shell and mechanical features
Symbol and pin-description review
Mismatches and recommended fixes
No hard pinout mismatch found
Metadata issues to fix
Review conclusion
