JXF0-2512NL 2.5GBase-T RJ45 Connector (90W PoE++, Rugged, THR)

JXF0-2512NL Integrated Connector Module Overview

The JXF0-2512NL is engineered to meet the twin demands of increasing bandwidth and high-wattage device powering in rugged industrial environments. Meeting full IEEE 802.3bz and IEEE 802.3bt specifications, this 1x1 RJ45 integrated connector delivers stable 2.5 Gbps Ethernet transmission while simultaneously supplying or receiving up to 90W of continuous power over 4-pair Category cabling.

To maintain superior signal fidelity under heavy DC loads, the JXF0-2512NL incorporates an internal 3-wire (3W) common mode choke placed specifically on the PHY side. This isolates the magnetic choke cores from the 900mA DC bias current running through the cable-side center taps, completely preventing magnetic core saturation. Housed in high-temperature UL 94V-0 thermoplastic with 3.20 mm matte-tin solder tails, the component is fully rated for Through-Hole Reflow (THR / Pin-in-Paste) automated assembly, achieving an MSL 1 shelf life and withstanding 260°C peak reflow profiles (IPC/JEDEC J-STD-075 Category R7).

Key Features:

• High-Speed 2.5Gbps Signal Integrity: Insertion loss is maintained below -1.0 dB across 1–250 MHz, with return loss exceeding -20 dB (1–40 MHz) and -10 dB (100–250 MHz) for clean eye diagrams and low bit-error rates.
• IEEE 802.3bt 90W 4-Pair Delivery: Dedicated high-current pins (Pins 15–18) channel up to 900mA continuous per pair loop (total 1.8A loop) directly into the cable pairs.
• Zero DC Saturation (3W PHY Choke): Positioning the 3-wire choke on the PHY side ensures maximum common-mode noise suppression (CMRR down to -35 dB) without DC-induced signal degradation.
• Integrated Bi-Colour Diagnostics: Built-in left and right anti-parallel LEDs (Green @ 568nm / Yellow @ 585nm) driven via Pins 11–14 provide instant visual link/activity feedback.
• Comprehensive EMI Shielding: Heavy-duty copper alloy shell with Top & Side EMI grounding fingers ensures low chassis resistance and robust compliance with FCC Part 68 and CISPR standards.

Technical Specifications Matrix

1. Electrical & RF Characteristics (@ 25°C, Operating -40°C to +85°C)

*Note: High-voltage isolation applies across the transformer coils only due to direct center-tap DC PoE connections.

2. Environmental, Material & Mechanical Ratings

3. Integrated Bi-Colour LED Specifications

Mechanical Dimensions & Pinout Guide (Drawing: JXF0-2512NL)

PCB RECOMMENDED PINOUT (Component Side View - 18 Pins)
   [12] [11] (Left Bi-Colour LED)             [14] [13] (Right Bi-Colour LED)
       [10] [8]  [6]  [4]  [2]   <- Signal Row 2
         [9]  [7]  [5]  [3]  [1]   <- Signal Row 1
             [18]  [16]          <- Dedicated 90W PoE Power Pins
               [17]  [15]
 (Shield Post)                                          (Shield Post)

Physical Dimensions: 16.80 mm (Width) × 25.53 mm (Length) × 13.50 mm (Height above PCB).

Suggested Panel Cutout: 17.82 mm × 14.01 mm. Latch orientation: Latch-Up (TU).

Pin Breakdown (18 Electrical Pins + 2 Shield Ground Tabs):

• Pins 1 to 10 (Signal & Center Taps, 0.45 × 0.35 mm):
  • Pins 1 & 2: MD1+ / MD1- | Pins 3 & 4: MD2+ / MD2-
  • Pins 5 & 6: MDCT2 / MDCT3
  • Pins 7 & 8: MD3+ / MD3- | Pins 9 & 10: MD4+ / MD4-
• Pins 11 to 14 (Bi-Colour LEDs, Square 0.50 × 0.50 mm):
  • Pins 11 & 12: Left LED (Green @ 568nm / Yellow @ 585nm)
  • Pins 13 & 14: Right LED (Green @ 568nm / Yellow @ 585nm)
• Pins 15 to 18 (PoE Power Injection Inputs, 0.45 × 0.35 mm):
  • Pin 15: VDC1+ | Pin 16: VDC1-
  • Pin 17: VDC2+ | Pin 18: VDC2-
  • Internal Termination: 4× 22nF caps, 4× 75Ω resistors, 1nF 2kV isolation capacitor to chassis ground.

Drill Hole Specifications:

• 14× Signal & PoE Holes: Finished diameter Ø0.89 mm.
• 4× LED Holes: Finished diameter Ø1.02 mm.
• 2× Plastic Standoff Posts: Ø1.57 mm.
• 2× Shield Grounding Posts: Ø3.25 mm.

Cross-Reference & Family Selection Guide

Technical FAQ

Q1: Why does JXF0-2512NL require an internal 3-wire (3W) choke on the PHY side?

A: When delivering 900mA continuous DC current over cable pairs, conventional cable-side common mode chokes experience severe magnetic DC saturation, collapsing inductance and destroying multi-gigabit data integrity. Placing a 3-wire choke on the PHY side isolates the choke coils from direct DC current, ensuring consistent CMRR across all frequencies.

Q2: What is the isolation testing rule for JXF0-2512NL during production Hi-Pot testing?

A: The 2250 VDC dielectric isolation rating applies strictly across the transformer (Pri:Sec). Never apply high-voltage test potentials between the RJ45 cable contacts and the PCB-side PoE pins (Pins 15–18), as these power lines are directly routed to the transformer center taps.

Q3: Can JXF0-2512NL be assembled using standard SMD reflow ovens?

A: Yes. The component is fully qualified for Through-Hole Reflow (THR / Pin-in-Paste). With an MSL 1 rating and J-STD-075 R7 classification, it withstands peak lead-free reflow body temperatures up to 260°C without risk of plastic blistering or pin misalignment.