H1081

Overview

The H1081 is a discontinued LAN pulse transformer module designed for 10/100 Base-T applications. It features a surface-mount package with dimensions of 25.40mm length, 10.03mm width, and 5.71mm height. The component operates within a temperature range of 0°C to 70°C and provides 1500V isolation voltage. Primary inductance is specified at 350 µH. The turns ratio is configured as 1:1.41 for the transmitter and 1:1 for the receiver. This single-port module was optimized for compatibility with specific transceivers such as the Kendin KS8761.

Feature Summary

• Optimized signal integrity and enhanced compatibility with AMD and Micrel transceivers
• Compliance with IEEE 802.3 specifications for reliable Ethernet transmission
• Surface-mount design facilitating integration into automated assembly processes

Applications

• 10/100 Base-TX network interface circuits
• Datacom transformer modules for networking hardware
• Customized high-end network system development

Procurement Notes

Verify current availability status as the H1081 is officially listed as obsolete and no longer manufactured by Pulse Electronics. Confirm that any available stock represents surplus inventory rather than active production. Ensure compliance with RoHS-5 requirements regarding prohibited substances, noting potential lead content in high-temperature solder joints if applicable. Validate that the component meets all necessary environmental and export classifications for your specific deployment region before finalizing procurement plans.

Selection Notes

Consider the H1081NL as a direct replacement option due to its identical functional characteristics and physical footprint. Evaluate the transition from tube packaging to alternative formats if required by modern SMT lines. Assess whether the specific 1:1.41 and 1:1 turns ratios align with your circuit design requirements. Verify that the operating temperature range of 0°C to 70°C suffices for your application environment without requiring extended industrial grade components.

Part Context

The H1081 belongs to the family of LAN transformers produced by Pulse Electronics, specifically engineered for data communication interfaces. It serves as a critical component in ensuring electrical isolation and signal matching between the PHY chip and the magnetics of an Ethernet port. As a single-port module, it simplifies PCB layout compared to discrete transformer solutions, offering a compact form factor suitable for space-constrained networking equipment designs.

Replacement Considerations

The H1081NL is identified as a direct substitute part number. Both components share identical electrical specifications and mechanical dimensions, allowing for pin-to-pin compatibility in existing designs.