ATTEND Part Review
Worked for 7 mins 37 sec
Created a project doc
Part Review Report: ATTEND 123A-58B01
Date: 2026-07-21 Official ATTEND product page: https://www.attend.com.tw/en/product.php?act=view&id=91
I created the detailed review in Part Review Report. Main finding: the contact numbering matches the B-key M.2 drawing, but the footprint pad/hole geometry reads back 1000× too small.
Thought for 1 min 50 sec
Completed the part review and added the official ATTEND datasheet URL to the part terminals. The full findings are in Part Review Report.
Open items:
- Critical footprint issue: signal pads, hold-down pads, and locating holes read back 1000× too small versus the official drawing.
- Pin numbering matches the B-key M.2 pattern, but pin descriptions/types are mostly unspecified.
- Several metadata fields are missing as explicit properties: manufacturer, MPN, ratings, temperature range, and material/plating details.
Suggested next steps:
- Fix the footprint unit-scale issue.
- Add missing part-level metadata properties.
- Re-verify footprint dimensions against the ATTEND drawing after correction.
Fix metadata and footprint
Fix footprint scaling
Add missing metadata
Run post-fix checks
Verify all geometry
Refine this doc
Ask about this doc
Part Review Report: ATTEND 123A-58B01
Date: 2026-07-21
Sources reviewed
- Official ATTEND product page: https://www.attend.com.tw/en/product.php?act=view&id=91
- Official ATTEND specification PDF: https://www.attend.com.tw/data/download/file/123A-58X01_Spec.pdf
- Official ATTEND drawing PDF: https://www.attend.com.tw/data/download/file/123A-58B01_B_1.pdf
- DigiKey product page: https://www.digikey.com/en/products/detail/attend-technology/123A-58B01/17633914
Part identification and key specifications
Table
| Item | Datasheet / official value | Current project observation | Status |
|---|---|---|---|
| Manufacturer | ATTEND Technology | Project name/description identify the part but no explicit Manufacturer Name property was observed on terminals. | Missing property metadata |
| MPN | 123A-58B01 | Project name is 123A-58B01; no explicit Manufacturer Part Number property was observed on terminals. | Mostly OK, property missing |
| Product description | M.2 Socket, H5.8, B Key, 0.5 Pitch, gold flash, black, reel | Project description: 67 Position Female Connector M.2 (NGFF) Mini Card Gold 0.020" (0.50mm) Black | OK |
| Connector type | M.2 / NGFF Mini Card socket, female, B key | Description matches female M.2 connector. | OK |
| Positions / contacts | 67 contacts | 67 signal terminal designators plus MP1/MP2 mechanical pads; project context says Pads: 69. | OK |
| Pin numbering | Top/odd row 1,3,5,7,9,11,21...75; bottom/even row 2,4,6,8,10,20...74; B-key gap removes 12-19 | Schematic terminals match this populated-number pattern. | OK |
| Pitch | 0.50 mm typ | Footprint contact coordinate pattern appears to encode 0.50 mm pitch but read back as 0.0005 mm increments. | Mismatch / unit-scale issue |
| SMT signal pad size | 0.30 mm x 1.55 mm | Read-back shows 0.0003 mm x 0.00155 mm. | Mismatch / 1000x too small |
| Hold-down pads | 1.20 mm wide, qty 2; drawing also shows side hold-down solder areas | MP1/MP2 read back as 0.0012 mm x 0.00275 mm. | Mismatch / 1000x too small |
| Locating holes | Ø1.10 mm and Ø1.60 mm | MH1/MH2 read back as Ø0.0011 mm and Ø0.0016 mm. | Mismatch / 1000x too small |
| Current rating | 0.5 A per pin | No current-rating property observed. | Missing property metadata |
| Voltage rating | 50 VAC | No voltage-rating property observed. | Missing property metadata |
| Operating / storage temperature | -40°C to +85°C | No operating-temperature property observed. | Missing property metadata |
| Durability | 60 cycles | No durability property observed. | Missing property metadata |
| Contact material / plating | Phosphor bronze C5210, gold flash on contact and solder area over nickel under-plating | Description includes gold, not detailed material/plating properties. | Partial metadata |
| Housing material | LCP E6808, UL94V-0, black | Description includes black only. | Partial metadata |
Datasheet URL update
No
Datasheet URL property was visible in the inspected terminal properties at the start of review. The official ATTEND specification URL was added to all terminal elements:https://www.attend.com.tw/data/download/file/123A-58X01_Spec.pdfThe official drawing URL should also be retained for footprint validation:
https://www.attend.com.tw/data/download/file/123A-58B01_B_1.pdfSchematic symbol review
What matches
- The symbol terminal count is correct for a B-key M.2 socket: 67 signal/contact terminals plus two mechanical pad terminals MP1 and MP2.
- Populated pin numbers match the M.2 B-key connector numbering pattern shown in the drawing:
- Odd/top row: 1, 3, 5, 7, 9, 11, then 21 through 75 odd.
- Even/bottom row: 2, 4, 6, 8, 10, then 20 through 74 even.
- The missing 12-19 range aligns with the B-key gap/contact omission.
Issues / gaps
- Every inspected terminal has
Pin Type: Unspecified. - No
Pin Descriptionvalues were observed. The ATTEND connector datasheet/drawing defines contact numbers and mechanics, but does not provide system signal functions for each M.2 contact. If signal descriptions are desired, they should be sourced from the M.2/NGFF electrical pinout specification rather than inferred from this connector drawing alone. - Manufacturer, MPN, current rating, voltage rating, temperature range, and material details are not visible as explicit part properties in the inspected terminal metadata.
Footprint review
What matches in pattern
- Footprint contains 67 contact pads plus two mechanical terminal pads and two additional locating/mount-hole pads.
- Contact ordering and row pattern appears consistent with the drawing: two staggered rows, 0.5 mm pitch pattern, and a B-key gap.
- The silkscreen/body outline is present and spans a plausible connector envelope.
Critical mismatch
The pad and hole geometry read back from the layout appears scaled down by 1000x compared with the ATTEND drawing:
Table
| Feature | Datasheet/drawing value | Layout read-back | Problem |
|---|---|---|---|
| Signal pad width | 0.30 mm | 0.0003 mm | 1000x too small |
| Signal pad length | 1.55 mm | 0.00155 mm | 1000x too small |
| Signal pad pitch | 0.50 mm | 0.0005 mm inferred from pad centers | 1000x too small |
| Hold-down pad width | 1.20 mm | 0.0012 mm | 1000x too small |
| Locating hole 1 | Ø1.10 mm | Ø0.0011 mm | 1000x too small |
| Locating hole 2 | Ø1.60 mm | Ø0.0016 mm | 1000x too small |
This is a manufacturability blocker: as read back, the copper pads and holes would be effectively microscopic and would not solder or mechanically mate with the connector. The likely root cause is a unit conversion issue in footprint geometry.
Recommended next fixes
- Correct the footprint pad and hole geometry by scaling the contact pads, hold-down pads, and locating holes by 1000x while keeping the same relative pattern.
- Add explicit part-level metadata where supported: Manufacturer Name, Manufacturer Part Number, Connector Type, Connector Gender, Connector Pitch, Connector Positions, Current Rating, Voltage Rating, Operating Temperature, Contact Finish, and Datasheet/Drawing URLs.
- Keep terminal pin types generic/passive unless a Flux connector-specific pin type is available; do not assign M.2 signal names unless sourced from an official M.2 pinout reference.
- Re-run a footprint read-back after fixing geometry and verify pad dimensions, pitch, row spacing, key gap, hold-down pads, and locating holes against the official ATTEND drawing.
Sources reviewed
Part identification and key specifications
Datasheet URL update
Schematic symbol review
What matches
Issues / gaps
Footprint review
What matches in pattern
Critical mismatch
Recommended next fixes
