H1081NL

Overview

The H1081NL is a single-port LAN pulse transformer module manufactured by Pulse Electronics, designed for surface-mount applications. It supports 10/100Base-TX Ethernet data interfaces and operates without Power over Ethernet (PoE). The component features a turns ratio of 1:1.141 for the transmitter and 1:1 for the receiver. Key electrical specifications include an insulation voltage of 1500 Vrms and a common mode rejection of -38 dB at 1 MHz. The device is rated for an operating temperature range of 0°C to 70°C and complies with RoHS3 standards.

Feature Summary

• Supports 10/100Base-TX Ethernet data interface applications
• Non-PoE configuration for standard network connectivity
• Surface-mount design for automated assembly integration

Applications

• Ethernet network interface cards
• Computer motherboard LAN ports
• Network adapter circuitry

Procurement Notes

Verify that the specific H1081NL variant matches the required 1:1.141 transmitter and 1:1 receiver turns ratio for the target design. Confirm compliance with RoHS3 regulations and ensure the operating temperature range of 0°C to 70°C aligns with system thermal requirements. Check moisture sensitivity level (MSL 3) handling procedures during storage and reflow soldering processes.

Selection Notes

Select this component when a non-PoE solution is required for 10/100Base-TX environments. Ensure the physical dimensions of 25.40mm x 10.03mm fit the PCB layout constraints. Consider the MSL rating for manufacturing logistics. This module is suitable for general-purpose Ethernet connectivity where PoE power delivery is not needed.

Part Context

The H1081NL belongs to the Pulse Electronics LAN transformer family, serving as a direct replacement for the discontinued H1081 model. While the original H1081 featured a 1:1.41 transmitter ratio, the H1081NL specifies a 1:1.141 ratio. Both are single-port modules intended for 10/100Base-TX applications, with the NL suffix indicating lead-free construction.

Replacement Considerations

The H1081NL is the confirmed direct substitute for the obsolete H1081 part number. Verify the turns ratio difference between the legacy H1081 (1:1.41 TX) and the H1081NL (1:1.141 TX) to ensure compatibility with existing circuit designs.