Würth Elektronik

LAN Transformers and Modular Jack Connectors

Würth Elektronik's LAN transformers offer multiple Ethernet solutions

Image of Würth Elektronik's LAN Transformers and Modular Jack ConnectorsWürth Elektronik's WE-LAN transformers are designed with at least one transformer and one common mode choke in each channel. The LAN transformer portfolio consists of the WE-LAN series with Power over Ethernet (PoE) up to 150 W and speeds up to 1 Gbit/s. The WE-LAN 10 G transformers with 10GBase-T and PoE+ over four pairs up to 150 W. The WE-LAN AQ transformers are manufactured by a fully automated process with Ethernet speeds up to 1 Gbit/s.

Würth Elektronik's WR-MJ modular jacks offer a broad range of connector types that comply with Ethernet and other communications standards. Modular jack connectors are the connector of choice for local data communication. The WR-MJ connectors are available in multiple versions, ranging from plastic to shielded options in vertical, horizontal, 45 degree, and 47.5 degree orientations. The jack design is in accordance with FCC regulation and compatible with IEEE standards IEEE 802.3u, 802.3z (8P8C RJ45), and PoE++-compatible up to 100 W (IEEE 802.3bt).

Würth Elektronik also offers the WE-RJ45 LAN transformers built with an RJ45 connector with integrated transformer/common mode choke available in multiple configurations, THT and SMT, and with or without LEDs. The WE-RJ45 LAN features PoE up to 50 W and speeds up to 10 Gbit/s.

Application Notes
LAN Transformer Features
  • Compliant with IEEE 802.3 standards: 802.3af, 802.3u, 802.3ab, 802.3at, 802.3bt, 802.3an
  • SMT
  • Inductance of 120 µH up to 350 µH
  • 1:1 ±2% turns ratio
  • -1.1 dB typ. insertion loss at 1 MHz to 100 MHz
  • -38 dB typ. crosstalk at 1MHz to 100MHz
  • -38 dB typ. differential to common-mode rejection at 1 MHz to 100 MHz
  • Return loss:
    • -18 dB min. 30 MHz
    • -14 dB min. 60 MHz
    • -12 dB min. 80 MHz
    • -10 dB min. 100 MHz
WR-MJ Modular Jack Connector Features
  • Jack design in accordance with FCC regulation
    • Mates all FCC plugs
  • 4P4C, 6P2C, 6P4C and 8P8C configurations
  • Stacking up to 2 x 6
  • Ethernet, Cat 3, Cat 5, Cat 6, and Cat 6a
  • Discreet solution for Ethernet protocol (8P8C RJ45)
    • Smaller footprint
    • High flexibility in PCB design
    • THR compatibility
    • Potentially better crosstalk performances
WE-RJ45 LAN Features
  • RJ45 connector with integrated transformer/common mode choke
  • PoE up to 50 W and speeds up to 10 Gbit/s
  • Available in SMT and THT 
  • Compliant with standards: IEEE 802.3u, IEEE 802.3ab, IEEE 802.3af, IEEE 802.3at, and IEE 802.3bt
  • Improved common mode rejection (CMRR) due to additional NiZn cores 

Pulse Transformers

BildTillverkarens artikelnummerBeskrivningAvailable QuantityPrisVisa detaljer
XFRMR 1:1 350UH SUPER TINY SMD74930000XFRMR 1:1 350UH SUPER TINY SMD6044 - Immediate$12.10Visa detaljer
XFRMR PULSE 1:1 120UH SMD74930100XFRMR PULSE 1:1 120UH SMD0 - Immediate$14.65Visa detaljer
WE-STST SMT SUPER TINY SIGNAL TR74930030WE-STST SMT SUPER TINY SIGNAL TR3971 - Immediate$20.41Visa detaljer
TRANSFORMER LAN 10/100 POE SMD749013011TRANSFORMER LAN 10/100 POE SMD5386 - Immediate$23.15Visa detaljer
TRANS WE-LAN 10/100 POE SMD749013011ATRANS WE-LAN 10/100 POE SMD11333 - Immediate$37.14Visa detaljer
TRANSFORMER LAN 10/100 SMD7490100111ATRANSFORMER LAN 10/100 SMD7201 - Immediate$37.71Visa detaljer
WE-LAN 10/100/1000 BASE-T SMT TR749020111AWE-LAN 10/100/1000 BASE-T SMT TR12100 - Immediate$37.42Visa detaljer
PULSE XFMR 1:1 300UH749010310PULSE XFMR 1:1 300UH923 - Immediate$51.03Visa detaljer
10/100 BASE-T SMD TRANSFORMER 1749012011010/100 BASE-T SMD TRANSFORMER 13866 - Immediate$48.38Visa detaljer
XFRMR LAN 1000 BASE-T 1:1 350UH749020023AXFRMR LAN 1000 BASE-T 1:1 350UH9986 - Immediate$56.42Visa detaljer

Modular Connector Jacks With Magnetics

BildTillverkarens artikelnummerBeskrivningAvailable QuantityPrisVisa detaljer
CONN JACK 1PORT PCB74990101212CONN JACK 1PORT PCB2435 - Immediate$56.23Visa detaljer
CONN JACK 1PORT PCB7499010121ACONN JACK 1PORT PCB2764 - Immediate$57.08Visa detaljer
CONN JACK 1PORT PCB7499011121ACONN JACK 1PORT PCB835 - Immediate$61.90Visa detaljer
CONN JACK 1PORT SURFACE MOUNT7498011122CONN JACK 1PORT SURFACE MOUNT138 - Immediate$67.00Visa detaljer
CONN JACK 1PORT PCB74984104400CONN JACK 1PORT PCB722 - Immediate$69.36Visa detaljer
CONN JACK 1PORT PCB74990101210CONN JACK 1PORT PCB5439 - Immediate$69.46Visa detaljer
CONN JACK 1PORT PCB7499011222ACONN JACK 1PORT PCB644 - Immediate$72.86Visa detaljer
CONN JACK 1PORT SURFACE MOUNT74980111211CONN JACK 1PORT SURFACE MOUNT1346 - Immediate$75.60Visa detaljer
CONN JACK 1PORT PCB74981104400CONN JACK 1PORT PCB487 - Immediate$76.64Visa detaljer
CONN JACK 1PORT PCB74981104402CONN JACK 1PORT PCB522 - Immediate$77.11Visa detaljer

Modular Jacks

BildTillverkarens artikelnummerBeskrivningAvailable QuantityPrisVisa detaljer
CONN MOD JACK 6P6C VERT UNSHLD615006138521CONN MOD JACK 6P6C VERT UNSHLD4620 - Immediate$6.71Visa detaljer
CONN MOD JACK 8P8C R/A SHIELDED615008140621CONN MOD JACK 8P8C R/A SHIELDED1229 - Immediate$22.87Visa detaljer
CONN MOD JACK 8P8C VERT SHIELDED615008138221CONN MOD JACK 8P8C VERT SHIELDED4327 - Immediate$22.87Visa detaljer
CONN MOD JACK 8P8C VERT SHIELDED615008140421CONN MOD JACK 8P8C VERT SHIELDED2436 - Immediate$24.29Visa detaljer
CONN MOD JACK 8P8C R/A SHIELDED615008137421CONN MOD JACK 8P8C R/A SHIELDED3109 - Immediate$24.29Visa detaljer
CONN MOD JACK 8P8C ANGLED SHLD615008145121CONN MOD JACK 8P8C ANGLED SHLD1118 - Immediate$30.33Visa detaljer
CONN MOD JACK 8P8C ANGLED SHLD615008145221CONN MOD JACK 8P8C ANGLED SHLD785 - Immediate$37.61Visa detaljer
MODULAR COMM JACK DUAL 8P8C615016137721MODULAR COMM JACK DUAL 8P8C3 - Immediate$40.73Visa detaljer
CONN MOD JACK 8P8C VERT SHIELDED615008138321CONN MOD JACK 8P8C VERT SHIELDED3302 - Immediate$43.38Visa detaljer
CONN MOD JACK 8P8C VERT UNSHLD615008144221CONN MOD JACK 8P8C VERT UNSHLD1368 - Immediate$10.58Visa detaljer
CONN MOD JACK 4P4C R/A UNSHLD615004143821CONN MOD JACK 4P4C R/A UNSHLD768 - Immediate$10.96Visa detaljer
CONN MOD JACK 6P6C R/A SHIELDED615006141121CONN MOD JACK 6P6C R/A SHIELDED1078 - Immediate$10.96Visa detaljer
CONN MOD JACK 8P8C VERT UNSHLD615008138021CONN MOD JACK 8P8C VERT UNSHLD829 - Immediate$16.16Visa detaljer
WR-MJ_MODULAR JACKS_MID-MOUNT_SM634108150321WR-MJ_MODULAR JACKS_MID-MOUNT_SM710 - Immediate$31.28Visa detaljer
WR-MJ_MODULAR JACKS_MID-MOUNT_TH615108150221RWR-MJ_MODULAR JACKS_MID-MOUNT_TH472 - Immediate$36.76Visa detaljer
CONN MOD JACK 8P8C R/A SHIELDED634008137521CONN MOD JACK 8P8C R/A SHIELDED924 - Immediate$29.01Visa detaljer
CONN MOD JACK 8P8C R/A SHIELDED61500814221CONN MOD JACK 8P8C R/A SHIELDED2160 - Immediate$21.55Visa detaljer
CONN MOD JACK 8P8C R/A SHIELDED615008142621CONN MOD JACK 8P8C R/A SHIELDED1122 - Immediate$23.15Visa detaljer
CONN MOD JACK 8P8C R/A SHIELDED615016137621CONN MOD JACK 8P8C R/A SHIELDED696 - Immediate$34.97Visa detaljer
CONN MOD JACK 8P8C R/A SHIELDED634008149821CONN MOD JACK 8P8C R/A SHIELDED1429 - Immediate$77.68Visa detaljer
Updated: 2025-11-11
Published: 2023-05-22

Related Videos

Skyworks’ compact and cost-effective IEEE 802.3 at class 2 PoE PD EVB and reference designs using Würth Elektroniks’ components
Skyworks’ compact and cost-effective IEEE 802.3 at class 2 PoE PD EVB and reference designs using Würth Elektroniks’ components

Publiceringsdatum: 2023-09-20

Würth Elektronik 2022 electronica Interview
Würth Elektronik 2022 electronica Interview

Publiceringsdatum: 2022-12-09

HARTING, ADI, and Würth Elektronik 2022 Electronica Interview – SPE
HARTING, ADI, and Würth Elektronik 2022 Electronica Interview – SPE

Publiceringsdatum: 2022-11-28

Related Product Highlight

Si3406-Based PoE PD Eval Board Skyworks’ Si3406-based isolated PoE PD reference design for multiple output voltage versions targeting compact, low-power, and high-efficiency applications.
Single Pair Ethernet Single Pair Ethernet from Würth can save up to 75% of your PCB space along with considerable reduction in the number of passive components, with only this 1 pair of wires.
WE-STST Super Tiny Signal Transformers Würth Elektronik has expanded its LAN portfolio with its WE-STST series super tiny signal transformers featuring a maximum component height of only 2.9 mm.

Related Articles and Blogs

Discrete or Integrated: Exploring Options for Gigabit Ethernet Front-End Protection Save design time and board space with integrated Gigabit Ethernet protection circuits.
Trade-Offs In Switching High-Input-Voltage Step-Down Converters at High Frequencies Benefits & pitfalls of switching high-input-voltage step-down DC/DC converters at higher frequencies shown in design examples.

Related Product Training Modules

High Performance Low EMI RJ45 Connectors with Integrated Magnetics Joins magnetic and noise reduction with RJ45 connectors. Modules are available with or without PoE/PoE+ capabilities and varying LED indicator configurations.