Renesas Electronics 813253BGLFT Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 813253BGLFT is a FemtoClock® Fanout Distribution IC designed for clock/timing applications requiring frequency translation and jitter attenuation. This device operates at 156.25MHz with a 2:3 input-to-output ratio and supports multiple input signal standards including HCSL, LVDS, LVHSTL, LVPECL, and SSTL, with LVPECL output. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

813253BGLFT

Renesas Electronics CorporationIn Stock: 753813253BGLFT Datasheet

Current PartRFQ

813N252BKI-04LFT

Renesas Electronics CorporationIn Stock: 4047813N252BKI-04LFT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The 813N252BKI-04LFT is identified as the manufacturer-recommended substitute for the 813253BGLFT. Substitution eligibility is determined by the following critical parameters:

Input signal compatibility: Both parts support HCSL, LVDS, LVHSTL, LVPECL, and SSTL input standards, enabling direct signal interface compatibility.

Differential signal processing: Both parts maintain differential input and output configurations, preserving signal integrity characteristics.

PLL and frequency division/multiplication capability: Both parts include integrated phase-locked loop functionality with divider and multiplier circuits, supporting flexible frequency scaling.

Supply voltage overlap: The 813N252BKI-04LFT supply range (3.135V ~ 3.465V) overlaps with the 813253BGLFT range (2.375V ~ 3.465V) within the upper operating window.

Surface mount packaging: Both parts use surface mount technology, maintaining PCB assembly compatibility.

Parameter Comparison

Engineering Selection Recommendations

The 813N252BKI-04LFT is an active product from Renesas Electronics and represents the manufacturer-recommended path for applications currently using the obsolete 813253BGLFT. The substitute part maintains core functional compatibility through shared input signal standard support, differential signal processing, and PLL-based frequency scaling architecture.

The 813N252BKI-04LFT offers extended operating temperature range (-40°C to 85°C versus 0°C to 70°C), supporting deployment in broader environmental conditions. The part achieves ROHS3 compliance, meeting current regulatory requirements for new designs and procurement cycles.

Physical package transition from 24-TSSOP to 32-VFQFN requires PCB layout modification. The increased pin count and different footprint necessitate schematic and board-level design updates. Supply voltage minimum specification increases from 2.375V to 3.135V, requiring verification of system power delivery architecture.

Maximum frequency capability doubles to 312.5MHz, providing headroom for future performance scaling. Output signal standard expansion to include LVDS alongside LVPECL offers additional system integration flexibility.

Frequently Asked Questions (FAQ)

Q: Can the 813N252BKI-04LFT directly replace the 813253BGLFT without design changes?

A: Direct socket replacement is not possible due to package differences (24-TSSOP versus 32-VFQFN). PCB layout and schematic modifications are required. Signal compatibility is maintained through common input/output standards.

Q: What are the critical differences in supply voltage specifications?

A: The 813253BGLFT operates from 2.375V to 3.465V, while the 813N252BKI-04LFT requires 3.135V to 3.465V. Systems operating below 3.135V require power supply redesign or alternative component selection.

Q: How do the frequency specifications compare?

A: The 813253BGLFT maximum frequency is 156.25MHz with a 2:3 input-to-output ratio. The 813N252BKI-04LFT operates at 312.5MHz maximum with a 2:2 ratio. The substitute supports higher frequency applications but requires verification of system clock distribution requirements.

Q: What is the impact of the input-to-output ratio change from 2:3 to 2:2?

A: The ratio change affects frequency scaling calculations. Systems relying on the specific 2:3 multiplication factor must recalculate clock distribution parameters for the 2:2 configuration.

Q: Are there moisture sensitivity considerations for storage and handling?

A: The 813253BGLFT carries MSL 1 (unlimited moisture sensitivity), while the 813N252BKI-04LFT is MSL 3 (168 hours). The substitute requires controlled storage conditions and has a 168-hour floor life after moisture exposure.

Q: Does the extended operating temperature range of the substitute affect system design?

A: The 813N252BKI-04LFT supports -40°C to 85°C versus 0°C to 70°C for the original part. This expansion enables deployment in industrial and automotive environments without thermal derating.