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HX1188FNL

100Base-TX single-port Ethernet transformer, 1CT:1CT, 1.5kV isolation, 350uH OCL, 16-pin SMD

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Manufacturer Part：

HX1188FNL

Package：

16-pin SMD Gull Wing (12.7 x 9.09 x 5.99 mm)

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Description

Product Overview

The HX1188FNL from Pulse Electronics is a single-port 100Base-TX Ethernet transformer/choke with 1CT:1CT turns ratio, designed for LAN applications. It provides 1.5kV isolation, 350uH open-circuit inductance, and meets IEEE 802.3 specifications in a 16-terminal gull-wing SMD package.

Key Specifications

Manufacturer Pulse Electronics
Transformer Type 100Base-TX Single Port
Turns Ratio 2(1CT:1CT)
Inductance (OCL) 350uH @ 100kHz, 8mA DC bias
Isolation Voltage 1500Vrms (50Hz, 60s)
Insertion Loss 1.0dB max @ 1-100MHz
Return Loss -18dB min @ 5MHz
Crosstalk -62dB min @ 1-100MHz
CMRR -32dB typ @ 100MHz
Number of Ports Single
Package 16-pin SMD Gull Wing
Operating Temperature -40C to +85C

Features

  • Single-port 100Base-TX Ethernet transformer
  • Center-tapped 1:1 turns ratio for TX and RX channels
  • High isolation: 1500Vrms
  • Meets IEEE 802.3 specifications
  • Low insertion loss: 1.0dB max
  • Excellent crosstalk performance: -62dB min
  • Good common-mode rejection: -32dB typical
  • Open frame construction for low profile
  • SMD gull-wing package for automated assembly
  • RoHS-6 compliant

Applications

  • 100Base-TX Ethernet PHY interface
  • LAN on motherboard (LOM) designs
  • Network interface cards (NIC)
  • Embedded Ethernet connectivity
  • Industrial Ethernet systems

The Pulse Electronics HX1188FNL is a single-port 100Base-TX Ethernet transformer/choke designed for Local Area Network (LAN) applications. It provides the necessary impedance matching, signal coupling, and electrical isolation between the Ethernet PHY transceiver and the RJ-45 connector. The device features a center-tapped 1:1 turns ratio for both transmit and receive channels, with 350uH open-circuit inductance measured at 100kHz with 8mA DC bias. The transformer provides 1500Vrms isolation voltage and meets all IEEE 802.3 electrical specifications for 100Base-TX operation. With crosstalk performance of -62dB minimum and common-mode rejection of -32dB typical, it ensures reliable signal integrity in noisy environments. The 16-terminal gull-wing SMD package enables automated pick-and-place assembly.

The HX1188FNL operates as a signal coupling and isolation transformer for 100Base-TX Ethernet: 1) Impedance Matching: The 1:1 turns ratio transformers match the impedance between the PHY transceiver (100Ohm differential) and the twisted-pair cable (100Ohm characteristic impedance), minimizing signal reflections. 2) Galvanic Isolation: The transformer provides 1500Vrms electrical isolation between the Ethernet controller side and the cable side, protecting equipment from ground loops, common-mode voltages, and transient events per IEEE 802.3 requirements. 3) Common-Mode Rejection: The center-tapped windings allow connection of Bob Smith termination resistors (75Ohm to ground via high-voltage capacitors) that absorb common-mode noise, improving EMI performance. 4) Signal Coupling: The transformer magnetically couples the differential transmit and receive signals between the PHY and the cable, passing the high-frequency data signals while blocking DC and low-frequency common-mode interference.

Pin Name Type Function
1 TD+ Input Transmit positive (PHY side)
2 TCT Center Tap Transmit center tap (PHY side)
3 TD- Input Transmit negative (PHY side)
4-6 NC – No connection
7 RX- Output Receive negative (PHY side)
8 RCT Center Tap Receive center tap (PHY side)
9 RX+ Output Receive positive (PHY side)
10-11 NC – No connection
12 TX+ Output Transmit positive (cable side)
13 TX- Output Transmit negative (cable side)
14 NC – No connection
15 RX+ Input Receive positive (cable side)
16 RX- Input Receive negative (cable side)
  • 100Base-TX Ethernet PHY to RJ-45 interface in embedded systems
  • LAN on motherboard (LOM) designs for desktop and server platforms
  • Network interface cards (NIC) for 100Mbps Ethernet
  • Industrial Ethernet equipment requiring galvanic isolation
  • Set-top boxes and IoT gateways with Ethernet connectivity
Manufacturer Part Number Package Notes
Pulse HX1188FNLT 16-pin SMD Tape and reel version
Pulse HX1188NL 16-pin SMD Narrow body version (7.11mm width)
TDK ACT45R-101-2P-TL003 SMD 100Base-TX transformer
Belfuse 0826-1G1T-33-F SMD Single port 10/100 transformer
YCL RH3129E SMD 100Base-TX compatible
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Quality Assurance

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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