Equivalent & Substitute Parts for Renesas 8543BGILF Clock Fanout Buffer

Part Overview

The Renesas 8543BGILF is a Clock Fanout Buffer (Distribution) Multiplexer IC with 2:4 ratio configuration, designed for high-speed clock distribution applications up to 650 MHz. This device features differential input and output capabilities with support for multiple input standards including CML, HCSL, LVDS, LVHSTL, LVPECL, and SSTL, with LVDS output format.

The 8543BGILF has reached obsolete product status. Identifying qualified substitute components is essential for design continuity, procurement planning, and system reliability in applications requiring clock distribution functionality.

Substiute Parts

8543BGILF

Renesas Electronics CorporationIn Stock: 51148543BGILF Datasheet

Current PartRFQ

8P34S1204NLGI

Renesas Electronics CorporationIn Stock: 10003208P34S1204NLGI Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 8543BGILF is determined by the following critical parameters:

Functional Requirements:

• Input:Output ratio of 2:4 configuration
• Differential input and output capability
• LVDS output format compatibility
• Support for LVDS input standard (minimum requirement)

Performance Specifications:

• Maximum frequency capability must meet or exceed application requirements
• Operating temperature range of -40°C to 85°C
• Supply voltage compatibility with system design

Physical and Compliance Constraints:

• Surface mount technology
• RoHS3 compliance
• REACH compliance status

The Renesas 8P34S1204NLGI qualifies as a manufacturer-recommended substitute based on matching the 2:4 differential input/output ratio, LVDS input/output support, identical operating temperature range, and equivalent compliance certifications. The substitute offers enhanced frequency capability (1.2 GHz versus 650 MHz) and maintains active product status, providing long-term availability assurance.

Parameter Comparison

Engineering Selection Recommendations

The 8P34S1204NLGI is the manufacturer-recommended substitute for the obsolete 8543BGILF. Selection of this substitute is supported by the following engineering factors:

Functional Compatibility: The substitute maintains the critical 2:4 differential input/output ratio and LVDS signal format required for clock distribution applications. Both devices support LVDS input standard, ensuring signal compatibility in existing system architectures.

Performance Enhancement: The 8P34S1204NLGI provides doubled maximum frequency capability (1.2 GHz versus 650 MHz), delivering improved performance headroom for current and future applications without functional degradation.

Product Status and Availability: The substitute holds active product status with Renesas Electronics Corporation, ensuring long-term availability, continued manufacturing support, and supply chain stability compared to the obsolete main part.

Compliance and Certification: Both devices maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for electronic component procurement and deployment.

Design Considerations: Supply voltage requirements differ between the main part (3.135V ~ 3.465V) and substitute (1.71V ~ 1.89V, 2.1V ~ 2.7V). System power supply design must accommodate the substitute's lower voltage specifications. Package footprint differs (20-TSSOP versus 16-VFQFN), requiring PCB layout modification. Moisture sensitivity level increases from MSL 1 to MSL 3, necessitating appropriate handling and storage protocols during manufacturing.

Frequently Asked Questions (FAQ)

Q: Can the 8P34S1204NLGI directly replace the 8543BGILF without PCB modifications?

A: No. While both devices provide 2:4 differential clock distribution with LVDS output, the package footprints differ significantly (20-TSSOP versus 16-VFQFN). PCB layout redesign is required to accommodate the different pin configuration and physical dimensions.

Q: What are the critical compatibility factors for substitution?

A: The substitute must maintain the 2:4 input:output ratio, support differential input and output signaling, provide LVDS output format, and operate within the required frequency and temperature ranges. The 8P34S1204NLGI meets all these criteria.

Q: Does the higher frequency rating of the substitute affect system design?

A: The 1.2 GHz maximum frequency of the 8P34S1204NLGI exceeds the 650 MHz requirement of the original design. This provides performance margin and does not negatively impact applications operating at lower frequencies. System timing and signal integrity analysis should verify compatibility with existing clock distribution architecture.

Q: Are there supply voltage compatibility issues?

A: Yes. The main part operates at 3.135V ~ 3.465V, while the substitute requires 1.71V ~ 1.89V or 2.1V ~ 2.7V. System power supply design must be modified to provide the appropriate voltage rails for the substitute device.

Q: What handling precautions apply to the substitute part?

A: The 8P34S1204NLGI has MSL 3 rating (168 hours), compared to MSL 1 (unlimited) for the original part. Stricter moisture control during storage, handling, and assembly is required. Components must be stored in controlled humidity environments and baked according to IPC standards before reflow soldering.

Q: Is the substitute recommended by the manufacturer?

A: Yes. The 8P34S1204NLGI is the manufacturer-recommended substitute provided by Renesas Electronics Corporation for the obsolete 8543BGILF.