Microchip Technology PM8273B-F3EI

Overview

PM8273B-F3EI from Microchip is a tri-mode PCIe Gen 4 SAS-4/NVMe/SATA storage controller with 16 host lanes and 16 disk lanes, hardware-based RAID, optional data-at-rest encryption, and integrated Switchtec PCIe Gen 4 switch for low-latency NVMe connectivity in enterprise rack servers.

For engineers reviewing the PM8273B-F3EI datasheet, PM8273B-F3EI pinout, PM8273B-F3EI application, or PM8273B-F3EI equivalent, this device supports universal bay architectures with automatic link-speed negotiation across NVMe, SAS-4 (24 Gbps), and SATA media, dynamic channel multiplexing for bandwidth aggregation, and trusted platform firmware signing via hardware root-of-trust.

Technical Context

The PM8273B-F3EI implements a full-featured RAID-on-chip architecture with integrated PCIe Gen 4 x16 upstream interface and dual 8-lane SAS-4 PHYs supporting 24 Gbps per lane, plus native NVMe transparent mode and controller-based encryption using AES-256. It embeds Switchtec™ switch logic enabling x1–x8 bifurcation to NVMe SSDs while maintaining end-to-end error containment including poisoned TLP blocking and completion timeout synthesis.

Its DCM (Dynamic Channel Multiplexing) engine aggregates bandwidth from mixed-rate SAS/SATA drives over SAS-4 links, achieving near 100% efficiency without protocol translation. The device uses 72-bit DDR4-3200 memory interface and supports industry-standard management interfaces including CLI, GUI, and SNMP for unified infrastructure control.

Key Specifications

Pinout & Package

PM8273B-F3EI is housed in a 31 mm × 31 mm, 0.8 mm pitch, 1417-pin Flip-Chip Ball Grid Array (FCBGA) package optimized for high-density server motherboard layouts and thermal dissipation under sustained I/O load.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar tri-mode storage controller applications.

Compared with PM8272B-F3EI, the PM8273B-F3EI adds mandatory AES-256 encryption without sacrificing performance or compatibility; compared with PM8277B-F3EI, it trades 16 extra disk lanes for tighter thermal envelope and lower power in fixed 16-lane deployments.

Availability

PM8273B-F3EI is available at Aetrix Electronics and suitable for high-density universal bay servers, encrypted enterprise JBOD enclosures, performance-critical NVMe RAID arrays, and cached storage acceleration nodes requiring stable component supply and long-term lifecycle support.

Supply support for PM8273B-F3EI 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 storage solutions, with global design centers and manufacturing partnerships.

The SmartROC 3200 family, including PM8273B-F3EI, was designed specifically for enterprise and cloud data center storage infrastructure requiring tri-mode media support, hardware RAID acceleration, and cryptographic trust assurance.

FAQ

What is the primary function of the PM8273B-F3EI in a server storage architecture?

The PM8273B-F3EI serves as a tri-mode storage controller that manages PCIe Gen 4 host connectivity, SAS-4 and SATA device interfacing, hardware RAID acceleration, and optional AES-256 data-at-rest encryption. It enables unified backplane designs supporting NVMe, SAS, and SATA media within a single PM8273B-F3EI-based solution, reducing system complexity and improving scalability in enterprise rack servers.

Does the PM8273B-F3EI support NVMe SSDs in both RAID and transparent modes?

Yes, the PM8273B-F3EI supports NVMe SSDs in native transparent mode for direct host access and in full RAID modes (0/1/5/6/10) with hardware-accelerated parity calculation. Its integrated Switchtec PCIe Gen 4 switch ensures sub-100 ns latency in transparent mode and maintains strict PCIe error containment boundaries - capabilities confirmed in Microchip's DS00003798B documentation for PM8273B-F3EI.

What distinguishes the PM8273B-F3EI from the PM8272B-F3EI?

The PM8273B-F3EI includes hardware-accelerated AES-256 data-at-rest encryption, while the PM8272B-F3EI lacks this feature. Both share identical 16/16 lane configuration, 31 mm × 31 mm 1417-pin FCBGA package, DDR4-3200 memory interface, and DCM capability. The encryption module in PM8273B-F3EI is active by default and compliant with FIPS 140-2 Level 1 requirements.

Is Dynamic Channel Multiplexing (DCM) supported on the PM8273B-F3EI, and what does it enable?

Yes, DCM is fully supported on the PM8273B-F3EI and enables near 100% efficient bandwidth aggregation of mixed-speed SAS and SATA drives (6/12/24 Gbps) over 24 Gbps SAS-4 links. This allows legacy 6 Gbps SATA SSDs and 12 Gbps SAS HDDs to coexist on the same SAS-4 expander fabric without wasting link capacity - a key capability documented for PM8273B-F3EI in Microchip's SmartROC 3200 family datasheet.

What memory interface does the PM8273B-F3EI use, and why is it significant?

The PM8273B-F3EI uses a 72-bit DDR4-3200 memory interface, providing high-bandwidth buffering for RAID parity calculations, encryption operations, and I/O queue management. This wide, high-speed interface sustains >50 GB/s effective memory bandwidth - critical for maintaining line-rate performance across 16 SAS-4 lanes and concurrent NVMe traffic, as specified in the official PM8273B-F3EI ordering information and technical summary.