PT5161LRS

Overview

The PT5161LRS is a 16-lane PCI Express Gen-5 and Compute Express Link smart retimer designed for low-latency signal integrity. It supports data rates of 32, 16, 8, 5, and 2.5 GT/s with automatic link equalization. The device extends reach by over 36 dB at 32 GT/s using integrated AC-coupling capacitors. Operating within a junction temperature range of -10 °C to 110 °C, it utilizes a 354-pin Flip-Chip CSP package measuring 8.9 mm x 22.8 mm. Flexible link bifurcation options include 1x16, 2x8, 4x4, and 8x2 configurations.

Feature Summary

• Protocol-aware architecture enabling cache-coherent links without system software intervention
• Integrated AC-coupling capacitors reduce solution size and improve signal integrity performance
• Advanced in-band and out-of-band diagnostics support fleet management and large-scale server deployments
• Supports hot plug/unplug, lane reversal, and automatic polarity correction

Applications

• Server and high-performance PC motherboards
• PCIe riser and add-in cards
• NVMe JBOFs and GPU/deep-learning accelerators

Procurement Notes

Verify the specific ordering suffix 'S' indicates a standard tube packaging quantity of 240 units. Confirm the operating junction temperature range of -10 °C to 110 °C meets thermal requirements. Ensure compliance with EU-RoHS and Halogen-Free standards is documented for the production batch. Validate the Moisture Sensitivity Level (MSL) rating of Level-3-260C-168 against assembly constraints.

Selection Notes

Select the PT5161LRS when a 16-lane PCIe Gen-5 or CXL retimer is required for space-constrained designs. The integrated AC-coupling capacitors minimize external component count compared to discrete solutions. Verify that the 354-pin FC-CSP footprint aligns with the target PCB land pattern. Consider the pin-compatible PT5161LX variant if CXL protocol support is explicitly needed alongside PCIe 5.0.

Part Context

The PT5161LRS belongs to the Aries Smart Retimer family, which includes pin- and register-compatible models like the PT5161LX and PT4161LR. This compatibility allows for easy performance scaling between CXL and PCIe Gen-4/Gen-5 applications. The series is designed to integrate seamlessly between Root Complexes and End Points, supporting flexible link bifurcation and advanced diagnostics.

Replacement Considerations

The PT5161LRL serves as a reel-pack alternative to the PT5161LRS tube. For CXL-enabled systems, the PT5161LXS provides equivalent functionality with explicit CXL support. Both are pin-compatible x16 variants within the same product family.