Molex Part Audit

Received notification from "Molex 78757 Audit" that it finished — picking the work back up.

Thought for 24 sec

I’ve reconciled the independent audit with the project data. The 68-contact numbering is consistent, but the symbol metadata and locator-hole tolerance need attention; I’m recording the full evidence and mismatch list now.

Worked for 1 min 28 sec

Created a project doc

Part Audit

View Document

Part Audit Scope

Audit of Molex 78757-0001 (0787570001) metadata, schematic symbol, footprint, pad numbering, and pin metadata against Molex product information and drawing references for series 78757 / U.2 (SFF-8639).

Project Metadata

The stored Datasheet URL was present before this audit. The Molex series page is the current official product source: https://www.molex.com/en-us/products/series-chart/78757

Key Manufacturer Specifications

Product: U.2 (SFF-8639), SAS-3 / PCIe-3 receptacle
Series: 78757
Status: Active in the reviewed manufacturer information
Orientation: Vertical
Termination: Surface mount, front solder tabs
Loaded circuits: 68 total — 53 signal and 15 power
Contact groups: E1–E25, S1–S28, P1–P15

flux

Audit complete. The 68 contact pads and primary footprint geometry match the Molex documentation; the Datasheet URL was already populated, so it was not changed.

Key flags: missing Part Type/package metadata, all symbol pins lack descriptions and electrical types, MP1/MP2 are mechanical tabs rather than connector circuits, and the Ø2.60 mm locator holes are at Molex’s maximum allowed tolerance. Full results: Part Audit.

Fix metadata and terminals

Correct locator holes

Verify controlled drawing

Improve datasheet source

Files

Pins

Symbol

Layout

Preview

Pin Number

E16

Pin Number

E16

Pin Number

E20

Pin Number

E20

Pin Number

E18

Pin Number

E18

S23

Pin Number

S23

S27

Pin Number

S27

E25

Pin Number

E25

S26

Pin Number

S26

S24

Pin Number

S24

Pin Number

E10

Pin Number

E10

Pin Number

E17

Pin Number

E17

S21

Pin Number

S21

S22

Pin Number

S22

Pin Number

E13

Pin Number

E13

Pin Number

P15

Pin Number

P15

S28

Pin Number

S28

P13

Pin Number

P13

S10

Pin Number

S10

MP2

Pin Number

MP2

E24

Pin Number

E24

E23

Pin Number

E23

P12

Pin Number

P12

E12

Pin Number

E12

P11

Pin Number

P11

E21

Pin Number

E21

Pin Number

S15

Pin Number

S15

E15

Pin Number

E15

Pin Number

E11

Pin Number

E11

S19

Pin Number

S19

S14

Pin Number

S14

Pin Number

E14

Pin Number

E14

S18

Pin Number

S18

Pin Number

P14

Pin Number

P14

Pin Number

S25

Pin Number

S25

S20

Pin Number

S20

S16

Pin Number

S16

Pin Number

E19

Pin Number

E19

MP1

Pin Number

MP1

Pin Number

S11

Pin Number

S11

S17

Pin Number

S17

P10

Pin Number

P10

S12

Pin Number

S12

S13

Pin Number

S13

Pin Number

E22

Pin Number

E22

Pin Number

Part Audit

Scope

Project Metadata

Table

Field	Project value	Audit result
Manufacturer	Molex	Matches
Manufacturer part number	78757-0001	Matches Molex 0787570001 formatting
Description	I/O Connectors U.2 Rec 68Ckt VrtSMT w/Frt Sldr Tab w/Cap	Functionally correct but abbreviated
Mount	Surface Mount	Matches
Designator prefix	J	Appropriate for a connector
Part Type	Empty	Mismatch / incomplete metadata; should identify an I/O connector or receptacle
Package	No explicit package property	Incomplete; a custom footprint is attached
Terminal count	70	Includes 68 circuits plus two mechanical solder tabs
Datasheet URL	Already populated	No update was required by the request

The stored Datasheet URL was present before this audit. The Molex series page is the current official product source: https://www.molex.com/en-us/products/series-chart/78757

Key Manufacturer Specifications

Product: U.2 (SFF-8639), SAS-3 / PCIe-3 receptacle
Series: 78757
Status: Active in the reviewed manufacturer information
Orientation: Vertical
Termination: Surface mount, front solder tabs
Loaded circuits: 68 total — 53 signal and 15 power
Contact groups: E1–E25, S1–S28, P1–P15
Pitch: 0.80 mm and 1.27 mm, depending on contact group
Recommended PCB thickness: 1.60 mm
Connector height: 8.15 mm
Peg length: 2.00 mm
Peg diameter: 2.36 mm nominal
Maximum voltage: 30 V
Maximum current: 1.5 A per contact
Operating temperature: 0 °C to +55 °C
Durability: 500 mating cycles maximum
Mating contact plating: 0.762 µm minimum gold
Termination plating: 2.540 µm minimum tin
Housing: black LCP, UL94 V-0
Reflow: 260 °C maximum for 10 seconds, one cycle
Packaging: embossed tape and reel, 500 pieces
Mates with Molex U.2 plug series 78758 and applicable SAS/SATA plugs

Manufacturer document references include SD-78757-001-000, PS-78757-001-001, AS-78757-001-001, TS-78757-001-001, and related signal-integrity/electrical-model documents.

Schematic Symbol Review

Matches

The symbol contains every standardized connector contact: E1–E25, S1–S28, and P1–P15.
No connector circuit is missing or duplicated in these 68 contact identifiers.
MP1 and MP2 correspond to the footprint's front solder/retention tabs.

Issues

Terminal count is presented as 70 although the connector is specified as 68 circuits. The additional MP1 and MP2 terminals are mechanical retention/solder tabs, not U.2 circuits. Keeping them as electrical terminals may be intentional for chassis/ground bonding, but they should be clearly described as mechanical tabs and excluded from any claim of 70 connector circuits.
All 70 terminals have Pin Type = Unspecified. This prevents meaningful ERC classification.
All terminals lack Pin Description metadata. At minimum, the 68 contacts should be described by their standard circuit identifiers/groups, and MP1/MP2 should be identified as retention or solder tabs.
Signal-function naming cannot be conclusively assigned from the Molex sales drawing alone. U.2 application signal names are governed by the applicable SFF interface specification. Do not infer PCIe/SAS functions solely from physical pad order without a licensed or authoritative pin-assignment source.

Footprint Review

Matches

Footprint contains exactly 68 contact pads: 25 E, 28 S, and 15 P.
Two SMT retention pads MP1 and MP2 are present.
Two non-plated locator holes MH1 and MH2 are present and are not included as schematic terminals.
Contact grouping, 0.80/1.27 mm pitches, 1.80 mm contact-land lengths, pad widths, retention-tab positions, and overall arrangement correspond to Molex drawing SD-78757-001 based on the available evidence.
The attached custom footprint and STEP model are named consistently with the MPN.

Definite mismatch

Locator-hole drill tolerance: the footprint uses fixed Ø2.60 mm NPTH holes. Molex specifies Ø2.50 mm with +0.10/−0.00 mm tolerance. A 2.60 mm finished drill is at the maximum allowed diameter rather than representing the nominal recommendation. This should be reviewed against the intended fabrication tolerance and assembly locating strategy.

Not fully verifiable

The public extracted drawing evidence was insufficient to conclusively validate every housing outline, courtyard, keepout, solder-tab-land tolerance, and 3D-model alignment. The footprint's primary pad pattern is consistent, but a manufacturing release should use the latest full Molex sales drawing as the controlling source.

Disposition

Datasheet property: unchanged, because a URL was already set.
Core 68-contact numbering: pass.
Symbol metadata quality: fail / incomplete — missing descriptions and pin types.
Mechanical-terminal representation: review required — MP tabs are not connector circuits.
Footprint contact land pattern: pass with available evidence.
Locator holes: tolerance concern — fixed 2.60 mm holes sit at the drawing's maximum diameter.
Part metadata: incomplete — Part Type and explicit package information are unset.

Scope
Project Metadata
Key Manufacturer Specifications
Schematic Symbol Review
Matches
Issues
Footprint Review
Matches
Definite mismatch
Not fully verifiable
Disposition