• TW2125A58NL, 10/100 Base RJ45 with Transformer Tab Up with Green&Yellow/ Green&Yellow Led - TeleWire Technology
  • TW2125A58NL, 10/100 Base RJ45 with Transformer Tab Up with Green&Yellow/ Green&Yellow Led - TeleWire Technology
  • TW2125A58NL, 10/100 Base RJ45 with Transformer Tab Up with Green&Yellow/ Green&Yellow Led - TeleWire Technology
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TW2125A58NL 10/100 Base-T RJ45 MagJack, Tab Up, Green&Yellow/ Green&Yellow LED

The TeleWire Technology TW2125A58NL is a 10/100 Base-T EMI-finger shielded RJ45 MagJack with integrated magnetics. Manufactured in Taiwan.

Cross Reference

  • Bel Fuse SI-50171-F — the TW2125A58NL cross-references to this part.
  • LINK-PP LPJ1014A47NL — same footprint, sourced outside mainland China.

Selection Notes

  • 10/100 Base-T — the transformer inside is specified for this rate.
  • Green&Yellow/ Green&Yellow LEDs — driven from the host; link and activity mapping is yours.
  • Integrated magnetics — one placement replaces the discrete magnetics and its routing.
  • EMI grounding fingers — chassis bond made at the bezel, not through the PCB.

Typical application: field devices where a 100 Mbit/s drop is the whole network requirement.

Pricing for the TW2125A58NL ranges from $0.50 to $3.00 USD depending on order quantity and configuration, with volume tiers available on request.

Validate the TW2125A58NL on your board first. Samples are available for design validation, and the mechanical drawing gives the footprint before you commit a layout. Request a sample or quotation.

Product Packaging Information

Package Tray (Reel packaging options available)
Carton size 32*30*31cm
Qty/carton 1200pcs
G.W/carton 8.5kg
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Product Specifications

RJ Type 8P8C(RJ45)
Ports 1x1
Speed 10/ 100 Base-T
Latch Type Up
LED Green&Yellow/ Green&Yellow
Shielding Shield with EMI Finger
PCB Mount Type Through Hole
Orientation Right Angle (90°)
AutoMDIX Yes
PCB Material FR4
Contact Material Gold
Contact Plating Gold Flash/ 6u"/ 15u"/ 30u"/ 50u"
Certification RoHS Compliant
Product Length (Inches/mm) 0.994/ 25.25
Product Width (Inches/mm) 0.636/ 16.15
Product Height (Inches/mm) 0.530/ 13.45
Temperature 0℃ ~ 70℃
Compatible Brands Belfuse

Related jacks

Same family, different latch, LED or plating option.

Cost-Effective Alternatives for Major Brand RJ45 Jack

Facing long lead times or high costs from major connector brands? We provide high-quality, drop-in replacements for standard modular jacks from TE, Molex, Amphenol, and Wurth. Our connectors match industry-standard footprints and performance specs at a more competitive price point.

From Flash, 3µ", 6µ", 15µ", 30µ", to 50µ" gold plating
Share the drawing to get equivalent match
Short lead times and consistent manufacturing in Taiwan
100% tested for contact resistance and insulation integrity
Request Custom Quote

We reply within 24 hours. No account needed. Your specifications stay confidential; NDA available on request.

What is a Taiwan-made alternative to the Bel Fuse SI-50171-F?
The TW2125A58NL from TeleWire Technology cross-references to the Bel Fuse SI-50171-F and to LINK-PP LPJ1014A47NL. It is manufactured in Taiwan, giving buyers a supply route outside mainland China for the same footprint. Send the footprint you are designing against and TeleWire Technology will confirm compatibility.
Can the TW2125A58NL be built to a different configuration?
Yes. The standard TW2125A58NL ships with Green&Yellow/ Green&Yellow LEDs and a tab-up latch. TeleWire Technology can change LED colour, latch direction, contact plating thickness (Gold Flash through 50 microinch) and tray or reel packaging against your drawing, while holding the footprint that matches Bel Fuse SI-50171-F.
How do I qualify the TW2125A58NL as a second source?
Request a sample of the TW2125A58NL and the mechanical drawing from TeleWire Technology, then check the footprint against the Bel Fuse SI-50171-F on your board. TeleWire Technology builds in Taiwan under an ISO 9001 quality system, and its engineering team will review your drawing before you commit.