Modular jack connectors · Made in Taiwan
Producent gniazd modułowych RJ45 i MagJack na Tajwanie
TeleWire Technology manufactures PCB-mount RJ45 modular jacks and MagJacks in Taiwan: more than 560 part numbers from 10/100 Base-T to 10GBase-T, PoE to PoE++, with 421 cross-referenced to Bel Fuse, Halo, Pulse, TE Connectivity and Würth Elektronik parts.
- Part numbers 560+
- Speed grades 10/100 → 10G
- Power over Ethernet PoE → PoE++
- Cross-referenced · 23 brands 421
- Engineering reply 24 h
MagJack basics
What is an RJ45 MagJack?
An RJ45 MagJack is an RJ45 jack with the Ethernet isolation transformer and common-mode chokes built into the connector housing. The magnetics isolate the cable from the PHY and suppress common-mode noise. IEEE 802.3 calls for 1500 Vrms isolation at this interface for 10/100/1000 Base-T.
MagJack (integrated magnetics)
The transformer and chokes sit inside the jack shell. A MagJack saves board area, keeps the pairs short between jack and PHY, and removes the transformer-to-jack routing from the layout.
Integrated RJ45 connectors →
RJ45 jack + discrete magnetics
A plain RJ45 jack is paired with a separate transformer on the board. The designer chooses the magnetics independently and can place them anywhere between the PHY and the connector.
RJ45 connectors without transformer →Browse
Browse modular jacks by type
Seven collections, one per design decision. Counts update automatically as parts are added.
Cross-reference
Taiwan-made alternatives to major RJ45 jack brands
421 TeleWire Technology jacks cross-reference to parts from 23 connector brands. Each TeleWire Technology product page names the parts it replaces and carries a mechanical drawing, so an engineer can confirm the footprint before committing a layout.
| Original manufacturer | TeleWire Technology jacks with a cross-reference |
|---|---|
| Halo Electronics | 115 |
| Bel Fuse (incl. Stewart Connector) | 111 |
| Pulse Electronics | 69 |
| TE Connectivity | 57 |
| Würth Elektronik | 51 |
| UDE | 35 |
| YDS | 29 |
| Hanrun | 27 |
| X Multiple | 19 |
| Bothhand, Amphenol, XFMRS, Molex and 10 more | see product pages |
| LINK-PP (LPJ series) | 98 Taiwan-made equivalents |
Brand names and part numbers identify the parts TeleWire Technology jacks are compatible with. TeleWire Technology is not affiliated with or endorsed by these manufacturers.
For design engineers
How to confirm a drop-in RJ45 jack equivalent
A cross-reference is a starting point. These eight checks decide whether a replacement jack drops onto an existing board without a layout change.
Footprint
Pin pitch, pin count including LED and shield pins, and mounting-post positions.
Magnetics schematic
Centre-tap arrangement and choke position must suit the PHY (voltage-mode or current-mode).
Speed grade
10/100 Base-T uses two pairs; gigabit and multi-gigabit use all four.
PoE tier
The magnetics must carry the per-pair current of 802.3af, 802.3at or 802.3bt.
LEDs
Colour, count and pin assignment, since the host PHY drives them.
Latch and orientation
Tab up or down, right-angle or vertical, and the panel cut-out.
Shielding
EMI fingers set the chassis-bezel grounding path and the cut-out tolerance.
Temperature grade
Commercial 0 to +70 °C or industrial -40 to +85 °C.
Catalogue
RJ45 modular jack catalogue at a glance
Every TeleWire Technology modular jack is built to an industry-standard footprint. These are the options across the range; each product page states the exact specification of that part.
| Attribute | What TeleWire Technology offers |
|---|---|
| Interface | RJ45 (8P8C, 10P8C, 12P8C, 16P8C, 10P10C) and RJ11/RJ12 (4P4C, 6P4C, 6P6C), plus an RJ45/RJ11 combo |
| Speed | 10/100 Base-T (IEEE 802.3u), 10/100/1000 Base-T (802.3ab), 2.5GBase-T and 5GBase-T (802.3bz), 10GBase-T (802.3an) |
| Magnetics | Integrated magnetics (MagJack) or without magnetics for designs with discrete transformers |
| Power over Ethernet | PoE (IEEE 802.3af), PoE+ (802.3at) and PoE++ (802.3bt) versions |
| Port configuration | Single port, ganged 1x2 to 1x8, stacked 2x1 to 2x8, and RJ45 with single or dual USB |
| Mounting and orientation | Through-hole or surface-mount; right-angle (90°) or vertical (180°); low-profile bodies |
| Latch | Tab up or tab down; on stacked jacks the two rows latch in opposite directions |
| Shielding | Shielded with EMI fingers, shielded, or unshielded |
| LEDs | No LEDs, or single and bi-colour green, yellow and orange LED combinations |
| Temperature grade | Commercial 0 to +70 °C, or industrial -40 to +85 °C (more than half the catalogue) |
| Contact plating | Gold flash, 3, 6, 15, 30 and 50 µin |
| Compliance and packaging | RoHS compliant; tray packing with tape-and-reel options |
Options
Configure-to-order and custom RJ45 jacks
TeleWire Technology also designs its own jacks. Send the footprint or mechanical drawing you are designing against and the engineering team will confirm compatibility or propose a design.
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LED
LED colour and configuration
Changed to match an existing front panel or PHY.
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Latch
Latch direction
Tab-up and tab-down versions of the same footprint.
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Plating
Contact plating
Gold flash through 50 µin, matched to the mating-cycle requirement.
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Packing
Packaging
Tray for manual assembly or tape-and-reel for automated lines.
Quality
Quality and testing
- ISO 9001:2015
Certified quality system
Production runs under an ISO 9001:2015 certified quality management system.
- 100% tested
Electrical test
Every jack is tested for contact resistance and insulation integrity.
- RoHS
Compliant materials
RoHS-compliant materials across the modular jack catalogue.
- Drawings
Mechanical drawings
Dimensions, footprint and pin-out are on each product page.
For sourcing teams
How to source RJ45 jacks from TeleWire Technology
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01
Send a part number, BOM or drawing
NDA available on request.
-
02
Engineering reply within 24 hours
With the matching TeleWire Technology part and its drawing.
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03
Samples
For validation on your board before any order.
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04
Quotation
With volume pricing tiers.
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05
Production in Taiwan
Tray or reel packing; US sales and technical support from Diamond Bar, California.
Applications
Where TeleWire Technology jacks are used
Industrial Ethernet
Switches, fieldbus controllers and factory automation I/O, using shielded -40 to +85 °C jacks.
PoE endpoints
IP cameras, wireless access points and VoIP phones, using PoE+ and PoE++ MagJacks.
Multi-gigabit equipment
Access points, NAS and embedded networking, using 2.5G, 5G and 10GBase-T jacks.
Energy systems
Solar inverters, energy storage controllers and smart meters, using low-profile industrial jacks.
Network infrastructure
Switch and router line cards, using stacked multi-port jacks.
Embedded and industrial PCs
Panels and gateways, using RJ45/USB combo jacks.
Technical FAQs
Common questions from procurement and engineering teams.
Who manufactures RJ45 MagJacks in Taiwan?
TeleWire Technology manufactures RJ45 MagJacks and other PCB-mount modular jacks in Taiwan. The catalogue covers more than 560 part numbers from 10/100 Base-T to 10GBase-T, with PoE to PoE++ versions and industrial-temperature options.
What is the difference between a MagJack and an RJ45 jack with discrete magnetics?
A MagJack builds the Ethernet isolation transformer and common-mode chokes into the jack housing, saving board area. A jack with discrete magnetics uses a separate transformer on the board, which lets the designer choose the magnetics independently.
Can TeleWire Technology replace a discontinued or allocated RJ45 jack?
Yes. 421 TeleWire Technology jacks cross-reference to parts from 23 brands, including Bel Fuse, Halo, Pulse and TE Connectivity. Send the part number and TeleWire Technology's engineering team replies within 24 hours with the matching part and drawing.
What if the RJ45 jack I need is not listed?
TeleWire Technology makes more modular jack models than are listed online. Share the drawing or the part number you are designing against, and the engineering team will return the closest alternative with its drawing.
Are samples available for design validation?
Yes. TeleWire Technology supplies RJ45 jack samples for board-level validation, together with the mechanical drawing, before any production order.
Which PoE standards do TeleWire Technology RJ45 jacks support?
TeleWire Technology offers MagJacks for PoE (IEEE 802.3af), PoE+ (IEEE 802.3at) and PoE++ (IEEE 802.3bt). Each product page states the PoE tier of that part.
Are industrial-temperature RJ45 jacks available?
Yes. More than half of the TeleWire Technology modular jack catalogue is rated -40 to +85 °C for industrial Ethernet, energy and outdoor equipment.
Where are TeleWire Technology modular jacks made?
TeleWire Technology modular jacks are manufactured in Taiwan. The company is headquartered in New Taipei, with US sales and technical support in Diamond Bar, California.
Get an equivalent
Find your RJ45 jack equivalent
Design engineers use the catalogue to find a jack that fits an existing footprint. Sourcing teams use it to qualify a Taiwan-made second source for parts that are obsolete, on allocation, or single-sourced. Engineering reply within 24 hours; NDA available on request.
Design engineers
Validate a jack on your board
Send the footprint, drawing or part number you are designing against, and request samples for validation.
Request a sample & drawingSourcing teams
Second-source or replace a part
Send the part numbers or BOM you need to second-source or replace, and receive TeleWire Technology equivalents with drawings within 24 hours.
Share your part number or drawing
Reviewed by Michael Wang, Senior Technical Engineer · ISO 9001:2015 certified manufacturer · Last reviewed September 2026