251M-21LF

Overview

The 251M-21LF is a clock generator manufactured by Renesas Electronics Corporation, belonging to the 8735BMI series. It operates as a differential 3.3V LVPECL zero-delay buffer with a maximum frequency of 700MHz. The component is housed in an SOIC-20 package and is classified under Clock Generators & Support Products within the Clock & Timer ICs subcategory. This device is currently designated as End-of-Life (EOL) and is no longer actively produced or stocked by major distributors.

Feature Summary

• Provides differential 3.3V LVPECL output signals for high-speed timing applications
• Functions as a zero-delay buffer to minimize jitter and phase noise in clock distribution networks
• Supports frequencies up to 700MHz for precise signal synchronization

Applications

• High-speed data communication systems requiring low-jitter clock distribution
• Server and storage infrastructure timing architectures
• Test and measurement equipment needing stable reference clocks

Procurement Notes

This component is officially listed as End-of-Life (EOL) by Renesas Electronics. Availability is restricted to remaining stock from authorized distributors or third-party suppliers. Verify authenticity carefully due to potential obsolescence risks. Check datasheet revisions and EOL notifications before integration into new designs. No new production units are expected.

Selection Notes

Select this part only for legacy system maintenance or direct replacement scenarios where pinout and electrical characteristics match exactly. For new designs, consider alternative active components from the same family or newer generations that offer similar LVPECL outputs and 700MHz performance without EOL constraints. Evaluate supply chain stability prior to procurement.

Part Context

The 251M-21LF belongs to the 8735BMI series of clock generators, which are designed for high-performance timing applications. These devices typically feature low jitter and wide bandwidth capabilities suitable for demanding digital systems. The series supports various output formats, with this specific model focusing on differential LVPECL signaling for robust noise immunity in sensitive electronic environments.

Replacement Considerations

• 8735BMI-21LF