Microchip Technology PM50068B1-FEI

Overview

PM50068B1-FEI from Microchip Technology is a Gen 5 PCIe fanout switch with 68 lanes, 18 virtual switch partitions, and 36 hot-plug controllers-designed as a high-reliability interconnect for NVMe SSD expansion in data center servers and telecom infrastructure.

For engineers reviewing the PM50068B1-FEI datasheet, PM50068B1-FEI pinout, PM50068B1-FEI application, or PM50068B1-FEI equivalent, key selection criteria include lane count (68), partition count (18), NTB support (up to 48), PCIe Gen 5 32 GT/s compliance, and integrated MIPS processor for firmware-managed error containment and diagnostics.

Technical Context

The PM50068B1-FEI implements a non-blocking PCIe Gen 5 switch fabric with full 32 GT/s link training support and manual PHY configuration capability. It integrates a MIPS-based management processor enabling real-time diagnostics, secure boot image authentication, and per-port hot- and surprise-plug control logic.

It supports up to 48 assignable nontransparent bridges (NTBs) across its 68 lanes and provides advanced error containment including Downstream Port Containment (DPC), Completion Timeout Synthesis (CTS), and Advanced Error Reporting (AER) on all ports-critical for carrier-grade reliability in metro and core networking equipment.

Key Specifications

Pinout & Package

PM50068B1-FEI is housed in a 35 mm × 35 mm, 1156-ball FC-BGA package (0.8 mm pitch) with signal ball mapping optimized for PCIe Gen 5 channel integrity and thermal dissipation in high-density server backplanes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCIe fanout switch applications.

Compared with PM50068B1-FEI, the PM50068B1-FEI-TR offers identical functionality in tape-and-reel format for SMT line efficiency, while PM51068B1-FEI adds SERDES robustness for long-trace deployments-making PM50068B1-FEI optimal for standard server motherboard integration where density and thermal profile are prioritized.

Availability

PM50068B1-FEI is available at Aetrix Electronics and suitable for data center storage expansion, 5G RU interconnect, and AI accelerator rack designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for PM50068B1-FEI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, FPGAs, and connectivity solutions with emphasis on reliability, security, and long-life product support.

The Switchtec PFX family-including PM50068B1-FEI-is designed specifically for high-availability PCIe fanout in cloud infrastructure, telecom edge, and industrial systems demanding hardware-enforced partitioning and fault containment.

FAQ

What PCIe generation and data rate does the PM50068B1-FEI support?

The PM50068B1-FEI supports PCIe Gen 5 at 32 GT/s with full link training compliance and manual PHY configuration capability. It maintains backward compatibility with Gen 4, Gen 3, Gen 2, and Gen 1 devices. This ensures seamless integration into evolving server platforms while delivering 64 GB/s aggregate bandwidth across its 68 lanes-critical for next-generation NVMe storage and AI workloads handled by the PM50068B1-FEI.

How many virtual switch partitions does the PM50068B1-FEI support, and what is their purpose?

The PM50068B1-FEI supports 18 independent virtual switch partitions. Each partition operates as a logically isolated PCIe switching domain with dedicated configuration space, ACLs, and traffic steering-enabling multi-tenant resource allocation in cloud servers or hardware-enforced separation of safety-critical and non-critical functions in industrial control systems. This partitioning capability is natively implemented in the PM50068B1-FEI silicon and requires no external arbitration logic.

Does the PM50068B1-FEI include an integrated processor, and what functions does it perform?

Yes, the PM50068B1-FEI integrates a MIPS-based management processor. It executes Microchip's certified firmware to handle secure boot authentication, real-time diagnostics (including eye capture and latency counters), per-port hot-plug sequencing, error logging, and sideband configuration via UART, TWI, or EJTAG. This on-die intelligence eliminates the need for external microcontrollers in most PM50068B1-FEI-based designs, reducing BOM cost and board area.

What types of nontransparent bridge (NTB) functionality does the PM50068B1-FEI provide?

The PM50068B1-FEI supports up to 48 assignable nontransparent bridges (NTBs) across its 68 lanes, with NT address translation using direct windows and multiple sub-windows per BAR. This enables peer-to-peer memory access between isolated PCIe domains-such as host-to-FPGA, GPU-to-GPU, or accelerator-to-storage-without host CPU involvement. The NTB implementation in PM50068B1-FEI is fully configurable per port and validated for use in high-performance computing and Open RAN architectures.

Is the PM50068B1-FEI compatible with standard PCIe mechanical form factors and connectors?

Yes, the PM50068B1-FEI is designed to interface with industry-standard PCIe connectors including SFF-8644, SFF-8643, SFF-8639, and OCuLink, supporting passive, managed, and optical cables. Its pinout and electrical specifications comply with PCIe CEM v5.0 and SHPC standards-ensuring interoperability with commercial off-the-shelf (COTS) NVMe drives, add-in cards, and backplane systems used in PM50068B1-FEI-based deployments.