B78476A8253A003

Overview

The B78476A8253A003 is a LAN pulse transformer manufactured by TDK Electronics, formerly EPCOS. It features a 1CT:1CT turns ratio and a nominal inductance of 350µH. Designed for surface mount installation, the component supports 10/100 Base-T and 1000 Base-T applications. The unit operates within a temperature range of -40°C to +85°C and provides an insulation voltage of 1.5 kV. Physical dimensions are approximately 17.6mm in length, 12.1mm in width, and 5.85mm in height.

Feature Summary

• Integrated magnetic module designed specifically for LAN signal transformation
• Supports high-speed data transmission standards including Gigabit Ethernet
• Surface mount construction optimized for automated PCB assembly processes

Applications

• 10/100 Base-T network interface circuits
• 1000 Base-T Gigabit Ethernet ports
• PoE (Power over Ethernet) compatible network hardware

Procurement Notes

Verify the specific suffix code against official TDK documentation to confirm exact electrical tolerances and packaging configuration. Ensure that the procurement channel sources components directly from authorized distributors to guarantee authenticity and traceability. Confirm RoHS compliance status matches current regulatory requirements before finalizing purchase orders.

Selection Notes

Select this component when designing LAN interfaces requiring integrated magnetics with a 1:1 coupling ratio. Verify that the 350µH inductance value aligns with the specific PHY transceiver requirements. Ensure the SMD package dimensions fit within the available board space constraints and thermal management guidelines for the target operating environment.

Part Context

This part belongs to the B78476A series of audio and signal transformers, specifically configured for LAN applications. TDK acquired EPCOS, and this component represents the continuation of the EPCOS product line under the TDK brand. The series is widely used in telecommunications and networking equipment requiring reliable signal isolation and impedance matching.

Replacement Considerations

Consult official TDK cross-reference documents for verified substitute part numbers. Do not assume functional equivalence based on similar naming conventions alone. Verify that any alternative component meets the same electrical specifications and physical footprint requirements.