Renesas 8745BYILF Clock Generator IC - Equivalent & Substitute Parts

Part Overview

The Renesas 8745BYILF is a Clock Generator IC designed for high-speed timing applications, operating at frequencies up to 700MHz with integrated Phase-Locked Loop (PLL) and bypass functionality. This device features differential input and output capabilities with support for multiple signaling standards including HCSL, LVDS, LVHSTL, LVPECL, and SSTL. The 8745BYILF is classified as Obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Substiute Parts

8745BYILF

Renesas Electronics CorporationIn Stock: 9578745BYILF Datasheet

Current PartRFQ

8T49N242-998NLGI

Renesas Electronics CorporationIn Stock: 12428T49N242-998NLGI Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 8745BYILF is determined by compatibility across the following critical parameters:

Functional Requirements:

• PLL with Bypass capability
• Differential input and output support
• Single circuit configuration
• Surface mount technology

Electrical Compatibility:

• Operating temperature range: -40°C ~ 85°C
• Supply voltage overlap within specified ranges
• Input/output signaling standard compatibility
• Frequency capability sufficient for application requirements

Regulatory & Compliance:

• REACH compliance status
• ECCN classification
• Moisture sensitivity level

The substitute part 8T49N242-998NLGI meets these criteria while offering enhanced frequency capability (1GHz maximum) and expanded input signaling options. However, package differences and output signaling limitations must be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The 8T49N242-998NLGI serves as the manufacturer-recommended substitute for the obsolete 8745BYILF. Both devices are manufactured by Renesas Electronics Corporation and share identical operating temperature ranges, MSL ratings, REACH compliance status, and ECCN classification.

The substitute part offers the following advantages:

• Active product status with ongoing manufacturer support
• Higher maximum frequency capability (1GHz vs. 700MHz)
• Expanded input signaling standard support including Crystal input
• ROHS3 compliance certification
• Broader output signaling options (HCSL, LVCMOS, LVDS, LVPECL)

Critical design considerations for substitution:

• Package change from 32-LQFP to 40-VFQFN requires PCB layout modification
• Input-to-output ratio differs (3:4 vs. 2:5), affecting frequency scaling calculations
• Supply voltage range is broader on the substitute part (2.375V minimum vs. 3.135V minimum)
• Output signaling is not limited to LVDS on the substitute, providing greater flexibility

Frequently Asked Questions (FAQ)

Q: Can the 8T49N242-998NLGI directly replace the 8745BYILF without PCB modifications?

A: No. The package change from 32-LQFP (7x7mm) to 40-VFQFN (6x6mm) with exposed pad requires PCB layout redesign. Pin assignments and footprints are not compatible.

Q: What is the impact of the different input-to-output ratio on system design?

A: The 8745BYILF operates at a 2:5 ratio while the 8T49N242-998NLGI operates at 3:4. This affects frequency multiplication/division calculations. System clock frequency requirements must be recalculated based on the substitute part's ratio.

Q: Are the signaling standards compatible between these parts?

A: Both parts support LVDS, LVHSTL, and LVPECL. The 8745BYILF additionally supports HCSL and SSTL inputs, while the 8T49N242-998NLGI supports LVCMOS and Crystal inputs. Output compatibility is limited to LVDS on the main part but expanded on the substitute.

Q: Does the substitute part meet the same environmental and compliance requirements?

A: Yes. Both parts share identical operating temperature ranges (-40°C ~ 85°C), MSL ratings (3, 168 Hours), REACH compliance status, and ECCN classification (EAR99). The substitute additionally carries ROHS3 certification.

Q: What is the significance of the broader supply voltage range on the substitute part?

A: The 8T49N242-998NLGI operates from 2.375V to 3.465V, compared to 3.135V to 3.465V for the 8745BYILF. This provides greater flexibility in power supply design but does not affect compatibility if the original supply voltage falls within both ranges.

Q: Is the substitute part suitable for new designs?

A: Yes. The 8T49N242-998NLGI is classified as Active with ongoing manufacturer support, making it appropriate for new product development. The 8745BYILF is Obsolete and should not be used in new designs.