Part Review and Datasheet Validation

flux

Part review summary
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

Table

FieldCurrent valueAssessment
DescriptionBEL MAGNETIC SOLUTIONS - L829-1J1T-43 - CONNECTOR, RJ45, JACK, 8P8C, THTLooks consistent
Manufacturer Part NumberL829-1J1T-43Consistent
Designator PrefixJAppropriate
MountThrough HoleConsistent
Datasheet URLPresentGood
Manufacturer NameBel Magnetic SolutionsConsistent
Part TypeInductorsIncorrect for an RJ45 MagJack
Symbol/part structure currently present

Table

ItemCurrent state
Symbol terminals19 total
Electrical terminals1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17
Extra mechanical/shield terminalsMH1, MH4
Pin naming in symbolAll generic; no functional names assigned
Pin types in symbolAll set to Unspecified
2) Datasheet scan and extracted metadata Product identity and features

Table

CategoryDatasheet finding
Part familyGigabit MagJack RJ45 integrated connector
Form factorUltra Low Profile
MagneticsIntegrated, 1CT:1CT on all 4 transformer channels
LED 1Yellow
LED 2Tri-color Green/Orange/Yellow
Isolation1500 Vrms
Compliance notesRoHS compliant, UL recognized, IEEE 802.3 isolation note present
Electrical characteristics found in the datasheet

Table

ParameterValue
Turns ratio TP1-TP41CT:1CT ±2%
OCL @ 100 kHz, 100 mVrms, 8 mA DC bias350 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-Pot1500 Vrms
LED characteristics found in the datasheet

Table

LEDParameterValue
LED1Forward voltage @ 20 mA2.1 V typ
LED1Dominant wavelength590 nm typ
LED2 green/yellow sideForward voltage @ 20 mA2.2 V typ
LED2 amber sideForward voltage @ 20 mA2.1 V typ
LED2 green/yellow sideDominant wavelength570 nm typ
LED2 amber sideDominant wavelength607 nm typ
Operating conditions / absolute max

Table

CategoryResult
Absolute maximum ratingsNot clearly present in the retrieved datasheet content
Recommended operating conditionsNot clearly present as a valid table for this connector
Temperature range explicitly tied to magnetics test0 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

Table

Pin(s)Datasheet name / function
1TRCT3
2TRD3-
3TRD3+
4TRD2+
5TRD2-
6TRCT2
7TRCT4
8TRD4+
9TRD4-
10TRD1-
11TRD1+
12TRCT1
13LED1-
14LED1+
15LED2 orange / negative side
16LED2 common / positive
17LED2 green / negative side
RJ45 side mapping from the datasheet

Table

RJ45 contactFunction
1TRP1+
2TRP1-
3TRP2+
4TRP3+
5TRP3-
6TRP2-
7TRP4+
8TRP4-
Mechanical / package information found

Table

ItemDatasheet finding
Mount styleThrough-hole
HousingThermoplastic PA, UL 94V-0
Shield materialNickel-plated copper alloy
Contact plating30 micro-inch hard gold plating
Output pinsTin-coated copper wire, 0.018 in diameter
3) Footprint cross-check against datasheet What the active footprint currently contains

Table

Footprint featureCurrent state
Signal pads1 through 12 present
LED pads13 through 17 present
Extra plated holesMH1, MH4 present
Extra non-plated locating holesNot present in the active Flux footprint node list
Important footprint data extracted from the footprint asset

Table

FeatureValue in footprint asset
Pads 1-12 drill1.02 mm
Pads 13-17 drill1.27 mm
MH1, MH4 drill1.57 mm plated
MH2, MH3 locating holes in source footprint asset3.25 mm NPTH each
4) Mismatches and risk assessment Critical findings

Table

SeverityFindingWhy it matters
HighThe 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.
HighAll 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.
MediumAll symbol pin types are Unspecified.ERC value is reduced and polarity/direction errors are easier to miss.
MediumPart Type is set to Inductors.This can cause bad classification, poor searchability, and ordering/BOM confusion.
MediumThe 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.
LowThe 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

Table

ItemAssessment
MPNMatches the datasheet
Mount styleThrough-hole, consistent
Presence of 17 electrical pins plus 2 shield/mechanical plated holesPlausible for this connector family
3D model + imported footprint assetPresent
Bottom line Main issues to fix

Table

PriorityFix needed
1Add the missing NPTH locating holes from the source footprint asset into the active footprint, if the datasheet requires them for this exact variant
2Rename terminals 1 through 17 to their datasheet functions
3Set proper pin types for center taps, differential pins, LED pins, and shield tabs
4Correct the part classification from Inductors to a connector-appropriate type
Highest-risk mismatch

Table

IssueRisk
Missing MH2/MH3 locating holes in the active footprintMost 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.
Sign up to send

L829-1J1T-43

L829-1J1T-43 thumbnail
1 Port RJ45 Through Hole 10/100/1000 Base-T, AutoMDIX #CommonPartsLibrary #Connector #Ethernet-connector #MagJack®

Properties

L829-1J1T-43

Bel Magnetic Solutions

Inductors

datasheet.datasheetarchive.com/originals/distributors/Datasheets-DGA2/203582.pdf

J

creativecommons.org/licenses/by/4.0/

Through Hole

Pricing & Availability

See prices from popular manufacturers for your project.

Controls