BCM84756CKFSBLG

Overview

The Broadcom BCM84756CKFSBLG is a high-performance Ethernet switch chip belonging to the Tomahawk family, designed for data center and enterprise core routing applications. It delivers a switching capacity of 12.8 Tbps with a port density supporting up to 32x400GbE or 64x200GbE interfaces. The device utilizes advanced 16nm process technology to achieve industry-leading power efficiency per bit. Key technical features include FlexPort dynamic port configuration, allowing flexible allocation of bandwidth across ports, and support for P4 programmability for custom packet processing. It integrates substantial on-chip buffering to handle burst traffic effectively.

Feature Summary

• Supports ultra-high throughput switching capacity suitable for core network infrastructure
• Enables flexible port configurations through dynamic bandwidth allocation mechanisms
• Integrates hardware acceleration for network virtualization protocols such as VXLAN and NVGRE
• Provides programmable packet processing capabilities via P4 language support

Applications

• High-density data center spine and leaf switches
• Enterprise core routers requiring multi-terabit aggregation
• Cloud computing infrastructure backbone networks
• Service provider edge routing equipment

Procurement Notes

Verify the specific suffix 'KFSBLG' against official datasheets to confirm package type, temperature range, and lead-free status. Ensure compatibility with existing PCB footprints and thermal management designs. Confirm supply chain authenticity through authorized distributors to avoid counterfeit components in critical infrastructure projects.

Selection Notes

Select this component when designing systems requiring 400GbE connectivity and high port density. Evaluate thermal constraints due to high performance levels. Consider alternative models if lower port counts suffice. Verify software ecosystem support for desired network operating systems and SDN controllers before finalizing the design.

Part Context

This part belongs to the Broadcom Tomahawk series, a line of high-end Ethernet switching silicon widely adopted in modern data centers. It represents a generation of chips focused on scaling bandwidth while managing power consumption. The specific model variant indicates a particular package and commercial temperature rating within the broader product family.

Replacement Considerations

Direct pin-to-pin replacements are generally unavailable due to proprietary architectures. Consider Broadcom's subsequent generations like the Tomahawk 4 or 5 for upgrades, or evaluate competitive offerings from Marvell and Intel. Migration requires significant redesign of firmware and hardware layout.