Find answers to common questions about LAN Filters. Need more help? Contact us for technical support.
A LAN filter, also known as a magjack or RJ45 connector with integrated magnetics, combines the Ethernet connector, isolation transformer, common-mode chokes, and sometimes LEDs into a single package. This saves PCB space and ensures signal integrity for 10/100/1000BASE-T applications.
Use our cross-reference database to search by your existing part number. We list compatible alternatives from various manufacturers. Each listing shows the Shareway equivalent part along with electrical specifications to ensure drop-in compatibility.
10/100BASE-T LAN filters use 1:1 transformer ratio with 2-pair configuration, while Gigabit (1000BASE-T) filters use 4-pair configuration with tighter common-mode rejection requirements. Always verify the speed rating before substituting.
Many LAN filters are designed to support PoE (IEEE 802.3af) and PoE+ (IEEE 802.3at) by providing DC bias injection through the center taps of the transformer windings. Check the specific part's PoE current rating for your application.
Most LAN transformers provide 1500VAC (or 2250VDC) isolation between the line side and PHY side per IEEE 802.3 standards. Some industrial-grade parts offer 4000VAC or higher for reinforced isolation requirements.
Yes, if the electrical specifications match (turns ratio, inductance, isolation voltage, and speed rating). The physical footprint will differ, so PCB layout adjustment is needed. Our cross-reference includes package type information for each alternative.
Magjacks typically include 1-2 LEDs for link/activity/speed indication. Common configurations include: green/yellow bicolor, green = link, yellow = activity, or two separate LEDs. The pinout varies by manufacturer, so verify before substituting.
Use isopropyl alcohol and a lint-free swab to clean the RJ45 port contacts. Avoid abrasive cleaners. For degraded signals, check for bent pins, oxidized contacts, or damaged transformer windings. Our cross-reference database can help find a replacement if needed.