Part Review and Datasheet Validation
1:48
Project
BOM
File
PCB Layout
Schematic
Fetching documents.
Using Schematic Tool.
Using BOM Tool.
Looking for "Product description, ordering information, package style, total number of contacts, and key features" in 203582.pdf
Looking for "Absolute maximum ratings and environmental/mechanical limits" in 203582.pdf
Looking for "Recommended operating conditions and electrical characteristics" in 203582.pdf
Looking for "Pin assignment, pin numbers, signal names, LED pins, shield pins, and pin descriptions" in 203582.pdf
Looking for "Mechanical dimensions, PCB layout dimensions, footprint recommendations, hole sizes, and package dimensions" in 203582.pdf
Looking for "Isolation, insertion loss, return loss, crosstalk, common mode rejection, turns ratio, and Hi-Pot test data" in 203582.pdf
Checking if I can make the changes for you.
Using PCB Layout Tool.
Reviewing datasheet inconsistencies.
Analyzing footprint discrepancies.
Part review summary
2) Datasheet scan and extracted metadata
3) Footprint cross-check against datasheet
4) Mismatches and risk assessment
Bottom line
I completed the review using the part metadata already present in the project and the datasheet URL already set on the part, so no web lookup or datasheet-property update was needed.
1) Available part information in the project
Project metadata
| Field | Current value | Assessment |
|---|---|---|
| Description | BEL MAGNETIC SOLUTIONS - L829-1J1T-43 - CONNECTOR, RJ45, JACK, 8P8C, THT | Looks consistent |
| Manufacturer Part Number | L829-1J1T-43 | Consistent |
| Designator Prefix | J | Appropriate |
| Mount | Through Hole | Consistent |
| Datasheet URL | Present | Good |
| Manufacturer Name | Bel Magnetic Solutions | Consistent |
| Part Type | Inductors | Incorrect for an RJ45 MagJack |
Symbol/part structure currently present
Product identity and features
| Category | Datasheet finding |
|---|---|
| Part family | Gigabit MagJack RJ45 integrated connector |
| Form factor | Ultra Low Profile |
| Magnetics | Integrated, 1CT:1CT on all 4 transformer channels |
| LED 1 | Yellow |
| LED 2 | Tri-color Green/Orange/Yellow |
| Isolation | 1500 Vrms |
| Compliance notes | RoHS compliant, UL recognized, IEEE 802.3 isolation note present |
Electrical characteristics found in the datasheet
| Parameter | Value |
|---|---|
| Turns ratio TP1-TP4 | 1CT:1CT ±2% |
| OCL @ 100 kHz, 100 mVrms, 8 mA DC bias | 350 µH min |
| Insertion loss, 0.1 MHz to 1 MHz | -1.1 dB max |
| Insertion loss, 1 MHz to 65 MHz | -0.5 dB max |
| Insertion loss, 65 MHz to 100 MHz | -0.8 dB max |
| Insertion loss, 100 MHz to 125 MHz | -1.2 dB max |
| Return loss, 0.5 MHz to 40 MHz | -18 dB min |
| Return loss, 40 MHz to 100 MHz | -12 + 20LOG(f/80 MHz) dB |
| Common-mode rejection, 100 kHz to 100 MHz | -30 dB min |
| Common-mode to differential-mode rejection, 100 kHz to 100 MHz | -35 dB min |
| Hi-Pot | 1500 Vrms |
LED characteristics found in the datasheet
| LED | Parameter | Value |
|---|---|---|
| LED1 | Forward voltage @ 20 mA | 2.1 V typ |
| LED1 | Dominant wavelength | 590 nm typ |
| LED2 green/yellow side | Forward voltage @ 20 mA | 2.2 V typ |
| LED2 amber side | Forward voltage @ 20 mA | 2.1 V typ |
| LED2 green/yellow side | Dominant wavelength | 570 nm typ |
| LED2 amber side | Dominant wavelength | 607 nm typ |
Operating conditions / absolute max
| Category | Result |
|---|---|
| Absolute maximum ratings | Not clearly present in the retrieved datasheet content |
| Recommended operating conditions | Not clearly present as a valid table for this connector |
| Temperature range explicitly tied to magnetics test | 0 to 70 °C |
The scan did return one block that looked like generic IC logic parameters. It does not match this connector family, so I did not use it.
Pin descriptions from the datasheet
| Pin(s) | Datasheet name / function |
|---|---|
| 1 | TRCT3 |
| 2 | TRD3- |
| 3 | TRD3+ |
| 4 | TRD2+ |
| 5 | TRD2- |
| 6 | TRCT2 |
| 7 | TRCT4 |
| 8 | TRD4+ |
| 9 | TRD4- |
| 10 | TRD1- |
| 11 | TRD1+ |
| 12 | TRCT1 |
| 13 | LED1- |
| 14 | LED1+ |
| 15 | LED2 orange / negative side |
| 16 | LED2 common / positive |
| 17 | LED2 green / negative side |
RJ45 side mapping from the datasheet
| RJ45 contact | Function |
|---|---|
| 1 | TRP1+ |
| 2 | TRP1- |
| 3 | TRP2+ |
| 4 | TRP3+ |
| 5 | TRP3- |
| 6 | TRP2- |
| 7 | TRP4+ |
| 8 | TRP4- |
Mechanical / package information found
| Item | Datasheet finding |
|---|---|
| Mount style | Through-hole |
| Housing | Thermoplastic PA, UL 94V-0 |
| Shield material | Nickel-plated copper alloy |
| Contact plating | 30 micro-inch hard gold plating |
| Output pins | Tin-coated copper wire, 0.018 in diameter |
What the active footprint currently contains
Important footprint data extracted from the footprint asset
Critical findings
| Severity | Finding | Why it matters |
|---|---|---|
| High | The active part symbol has 19 terminals, but the source footprint asset includes two additional NPTH locating holes (MH2, MH3) that do not appear in the active Flux footprint node tree. | If those locating holes are missing from the real PCB footprint, the connector may not physically fit the board. This is a manufacturing/assembly failure risk. |
| High | All symbol terminals are generic and unnamed. | This creates a strong risk of wiring the transformer pairs, center taps, or LEDs incorrectly, which can cause board failure or nonfunctional Ethernet. |
| Medium | All symbol pin types are Unspecified. | ERC value is reduced and polarity/direction errors are easier to miss. |
| Medium | Part Type is set to Inductors. | This can cause bad classification, poor searchability, and ordering/BOM confusion. |
| Medium | The datasheet clearly distinguishes LED polarity and LED2 color behavior, but the current symbol does not encode those functions. | Easy to miswire LEDs or misunderstand the tri-color behavior. |
| Low | The project only exposes generic terminal designators rather than connector-style named pins. | Not fatal by itself, but it makes integration into real designs more error-prone. |
What appears correct
| Item | Assessment |
|---|---|
| MPN | Matches the datasheet |
| Mount style | Through-hole, consistent |
| Presence of 17 electrical pins plus 2 shield/mechanical plated holes | Plausible for this connector family |
| 3D model + imported footprint asset | Present |
Main issues to fix
| Priority | Fix needed |
|---|---|
| 1 | Add the missing NPTH locating holes from the source footprint asset into the active footprint, if the datasheet requires them for this exact variant |
| 2 | Rename terminals 1 through 17 to their datasheet functions |
| 3 | Set proper pin types for center taps, differential pins, LED pins, and shield tabs |
| 4 | Correct the part classification from Inductors to a connector-appropriate type |
Highest-risk mismatch
| Issue | Risk |
|---|---|
| Missing MH2/MH3 locating holes in the active footprint | Most likely to cause immediate assembly/mechanical failure |
If you want, I can next turn help you turn this into a precise edit checklist for the part project.
2 days
Ready.
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Pricing & Availability
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Assets
L829-1J1T-43
L829-1J1T-43.stp3D Model
L829-1J1T-43-thumb.png
L829-1J1T-43-thumbThumbnailkicad_mod
L829-1J1T-43
L8291J1T43.kicad_modFootprint
L829-1J1T-43
L829-1J1T-43 Symbol.svgDefaultControls
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