H1278NL

Overview

The H1278NL is a single-port LAN transformer module manufactured by Pulse Electronics, designed for surface-mount technology (SMD/SMT) applications. It supports 10/100Base-T Ethernet standards and operates within a frequency range of 1 MHz to 100 MHz. The component features an inductance of 350 uH and provides an insulation voltage of 1.5 kV. It is unshielded and rated for a single channel. The operating temperature range extends from -40°C to +85°C. Physical dimensions are 25.4 mm in length, 12.83 mm in width, and 6.22 mm in height. The package type is a tube.

Feature Summary

• Supports 10/100Base-T Ethernet data transmission standards
• Provides galvanic isolation with 1.5 kV insulation voltage rating
• Designed for surface-mount assembly on printed circuit boards
• Operates reliably across extended industrial temperature ranges

Applications

• 10/100Base-T network interface circuits
• Single-port Ethernet connectivity modules
• LAN transformer integration in networking hardware

Procurement Notes

Verify the specific datasheet version and RoHS compliance status prior to ordering, as manufacturer specifications may be updated. Confirm that the surface-mount footprint matches the target PCB design layout exactly. Ensure that the thermal management strategy accommodates the specified operating temperature limits during system integration. Cross-reference the part number suffixes to confirm availability of the correct packaging configuration for the production line.

Selection Notes

Select this component when designing systems requiring isolated signal transformation for 10/100 Mbps Ethernet connections. Consider the physical dimensions and SMD mounting requirements against available board space. Evaluate the thermal performance characteristics to ensure stability within the defined operating temperature range. Verify compatibility with the intended network interface controller and trace impedance requirements for optimal signal integrity.

Part Context

This component belongs to the HX series of LAN transformers produced by Pulse Electronics. It serves as a critical passive element in wired communication infrastructure, facilitating reliable data transfer between the MAC layer and the physical medium. The module integrates magnetic components necessary for signal coupling and noise rejection in standard Ethernet deployments.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.