DS125BR401SQE/NOPB

Overview

The DS125BR401SQE/NOPB is a four-channel PCI Express retimer manufactured by Texas Instruments. It supports data rates from 2.5 Gbps to 8.0 Gbps, compatible with PCIe Gen1 through Gen3 standards. The device operates on a single supply voltage ranging from 2.375 V to 3.6 V, typically utilizing 2.5 V or 3.3 V rails. It features integrated clock and data recovery (CDR) circuits for each lane, providing signal regeneration to extend trace lengths in high-speed digital systems. The component is housed in a 54-pin WQFN package measuring 10 mm by 5.5 mm, designed for surface-mount assembly.

Feature Summary

• Four independent channels with integrated clock and data recovery for signal regeneration
• Supports multiple interface protocols including PCI Express, SAS, and SATA
• Includes input equalization and output de-emphasis capabilities for channel loss compensation

Applications

• PCIe front port extensions in server and storage architectures
• Backplane interconnects requiring signal integrity restoration
• Peripheral I/O interfaces demanding high-speed data transmission

Procurement Notes

Verify the specific suffix 'SQE' against the manufacturer's official documentation to confirm pinout compatibility and functional equivalence with other variants in the DS125BR401 family. Ensure that the ordering information matches the exact package type and moisture sensitivity level required for the manufacturing process. Cross-reference the datasheet revision date to validate parameter accuracy before finalizing procurement specifications.

Selection Notes

Select this component when designing systems requiring active signal regeneration for PCIe Gen1, Gen2, or Gen3 links. The integrated CDR functionality makes it suitable for applications where passive equalization is insufficient due to excessive channel loss. Consider the power consumption and thermal dissipation characteristics of the 54-WQFN package during the initial layout phase to ensure reliable operation within the specified temperature range.

Part Context

This part belongs to the DS125BR401 series of high-speed serial link repeaters. It is functionally related to the DS125BR800, which offers eight lanes, and the DS64BR401, which provides bidirectional connectivity. The DS125BR401 specifically targets unidirectional four-lane applications, serving as a core building block for maintaining signal integrity in complex motherboard and backplane designs.

Replacement Considerations

The DS125BR401SQ/NOPB is a direct pin-compatible alternative within the same series. Verify that the non-E suffix variant meets all electrical and mechanical requirements for the specific application before substitution.