XRT91L31IQ

Overview

The XRT91L31IQ is a SONET/SDH transceiver manufactured by MaxLinear, designed for telecommunications interface applications. It supports data rates of 622.08 Mb/s and 155.52 Mb/s with an 8-bit TTL interface operating at 3.3V. The device functions within a supply voltage range of 3.135 V to 3.465 V and operates in temperatures from -40°C to +85°C. It is housed in a PQFP-64 surface-mount package and carries RoHS compliance.

Feature Summary

• Supports STM-1 (155.52 Mb/s) and STM-4 (622.08 Mb/s) data rates
• Operates on a single 3.3V power supply
• Includes 8-bit TTL interface for system integration
• Qualified for industrial temperature range (-40°C to +85°C)

Applications

• SONET/SDH network transmission systems
• Telecommunications interface circuits
• Digital cross-connect systems

Procurement Notes

The XRT91L31IQ-F variant is listed as End-of-Life (EOL). Availability is restricted, and distributors may not stock this item in all regions. Verification of current lifecycle status and alternative sourcing channels is required before procurement planning.

Selection Notes

Select the XRT91L31IQ for legacy SONET/SDH designs requiring 155.52 Mb/s or 622.08 Mb/s throughput. Ensure the design accommodates the PQFP-64 package dimensions and 3.3V logic levels. Verify humidity sensitivity handling during assembly due to MSL classification.

Part Context

This component belongs to the MaxLinear XRT series of telecom interface ICs. It is distinct from other XRT models by its specific support for STM-1 and STM-4 rates and its 8-bit TTL interface configuration, differentiating it from parallel or serial variants in the family.

Replacement Considerations

As the part is discontinued, verify if MaxLinear offers a direct pin-compatible successor or if a functional equivalent from another manufacturer meets the STM-1/STM-4 electrical specifications and PQFP-64 footprint requirements.