The LP2019NL is a compact 10/100BASE-TX Ethernet magnetics module designed for VoIP, LAN, and Power over Ethernet (PoE) applications. It integrates high-performance isolation transformers optimized for Fast Ethernet signal integrity while supporting PoE power delivery up to 600 mA.
LP2019NL is widely used in SOHO networking equipment, LAN-on-Motherboard (LOM) designs, Ethernet hubs, switches, IP phones, and ADSL modems, where stable data transmission and reliable isolation are critical.
Manufactured to meet RoHS compliance and rated for 250 °C peak solder temperature, the LP2019NL offers excellent manufacturability and long-term reliability.
LP2019NL Power Over Ethernet Transformer Key Features:
- Supports 10/100BASE-TX Ethernet applications
- Integrated PoE magnetics, up to 600 mA current capability
- Optimized for VoIP and IP phone designs
- Low insertion loss and excellent return loss performance
- High common-mode and differential-mode noise rejection
- 1500 Vrms isolation voltage
- Compact surface-mount package
- RoHS compliant ("NL" version)
- Peak reflow solder rating: 250 °C
Electrical Specifications (@25 °C)
| Electrical Specifications |
Value / Condition |
| Turns Ratio |
TX: 1CT : 1CT RX: 1CT : 1CT |
| Insertion Loss |
0.1–100 MHz: -1.0 dB Max |
| Return Loss |
0.1–30 MHz: -18 dB Min
30–60 MHz: -13 dB Min
60–80 MHz: -12 dB Min |
| Crosstalk |
0.1–100 MHz: -35 dB Min |
| Differential-to-Common Mode Rejection (DCMR) |
30 MHz: -42 dB Min
60 MHz: -36 dB Min
100 MHz: -33 dB Min |
| Common Mode Rejection Ratio (CMRR) |
1–100 MHz: -40 dB Typ |
| Inductance (OCL) |
Pins 1–3, 6–8: 350 µH Min @ 100 kHz, 0.1 V, 8 mA DC Bias |
| DC Resistance (DCR) |
Pins 1–3, 6–8: 0.9 Ω Max |
| Leakage Inductance (LK) |
1–3 (Tie: 16+14): 0.5 µH Max @ 100 kHz, 0.1 V
6–8 (Tie: 11+9): 0.5 µH Max @ 100 kHz, 0.1 V |
| Interwinding Capacitance (Cw/w) |
(1–3), (16–14): 28 pF Max @ 100 kHz, 0.1 V
(6–8), (11–9): 28 pF Max @ 100 kHz, 0.1 V |
| Isolation Voltage |
1500 Vrms |
Environmental & Mechanical Specifications
| Specification |
Value / Condition |
| Operating Temperature |
0 °C to +70 °C |
| RoHS Compliance |
Yes (NL suffix) |
| Package Type |
Surface Mount |
| Body Dimensions |
Length: 12.70 mm Width: 8.89 mm (typ.) Height: 7.15 mm max |
LP2019NL Pin Configuration & Circuit Description
The LP2019NL integrates separate transmit (TX) and receive (RX) isolation transformers with center taps, suitable for Fast Ethernet PHY interfaces.
- TX Side: Pins 1 (TD+), 2 (TCT), 3 (TD−)
- RX Side: Pins 6 (RD+), 7 (RCT), 8 (RD−)
- Cable Side TX: Pins 16 (TX+), 15 (TXCT), 14 (TX−)
- Cable Side RX: Pins 11 (RX+), 10 (RXCT), 9 (RX−)
This configuration supports PoE power injection through the center taps while maintaining signal isolation and EMI control.
Typical Applications of PoE Magnetics Module
- VoIP phones
- IP telephones
- Ethernet switches (10/100 Mbps)
- Ethernet hubs
- LAN-on-Motherboard (LOM)
- SOHO networking equipment
- ADSL modems
Compliance & Reliability
- IEEE 802.3 compliant (10/100BASE-TX)
- PoE-ready magnetics design
- RoHS compliant
- Suitable for automated SMT assembly
FAQ-Ethernet Magnetics
Q1: What is the LP2019NL used for?
The LP2019NL is used in 10/100BASE-TX Ethernet interfaces to provide signal isolation, impedance matching, and noise suppression. It is commonly deployed in VoIP phones, IP telephones, Ethernet switches, and SOHO networking equipment.
Q2: Does LP2019NL support Power over Ethernet (PoE)?
Yes. LP2019NL is designed for PoE-enabled Ethernet applications and supports a continuous current of up to 600 mA, making it suitable for IP phones and other PoE-powered devices.
Q3: Is LP2019NL compatible with IEEE 802.3 standards?
Yes. LP2019NL complies with IEEE 802.3 10/100BASE-TX electrical and isolation requirements and is suitable for Fast Ethernet PHY designs.
Q4: What is the turns ratio of LP2019NL?
The transformer uses a 1CT:1CT turns ratio on both the transmit (TX) and receive (RX) channels, ensuring signal symmetry and PHY compatibility.
Q5: What isolation voltage does LP2019NL provide?
LP2019NL provides an isolation rating of 1500 Vrms, meeting standard Ethernet safety and isolation requirements.
Q6: Is LP2019NL suitable for VoIP and IP phone designs?
Yes. LP2019NL is optimized for VoIP and IP phone applications, offering low insertion loss, strong common-mode noise rejection, and reliable PoE power handling.
Q7: Is LP2019NL RoHS compliant?
Yes. The NL suffix indicates full RoHS compliance and a peak reflow solder temperature rating of 250 °C.
Summary
The LP2019NL 10/100BASE-TX VoIP Magnetics Module is a compact, PoE-ready Ethernet transformer solution designed for Fast Ethernet applications. With high isolation voltage, excellent EMI performance, and compliance with IEEE 802.3 standards, LP2019NL is a reliable choice for VoIP phones, IP telephones, and Ethernet networking equipment.
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LP2019NL 10/100BASE-TX VoIP Magnetics Module with PoE Support Images
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