Renesas 574MLFT Zero Delay Fanout Buffer - Equivalent & Substitute Parts

Part Overview

The Renesas 574MLFT is a fanout buffer (distribution) integrated circuit designed for clock and timing applications. This zero delay buffer operates at frequencies up to 160MHz with a 1:4 input-to-output ratio and supports supply voltages from 3V to 5.5V. The device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. Substitute parts must maintain compatible electrical characteristics, package form factor, and operational parameters to ensure direct replacement capability.

Substiute Parts

574MLFT

Renesas Electronics CorporationIn Stock: 3967574MLFT Datasheet

Current PartRFQ

2305A-1HDCG8

Renesas Electronics CorporationIn Stock: 11622305A-1HDCG8 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 574MLFT is determined by the following critical parameters:

Package Compatibility: The substitute part must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure PCB footprint compatibility and assembly process alignment.

Functional Classification: The substitute must be classified as a zero delay buffer or fanout buffer device with PLL capability to maintain the core timing distribution function.

Electrical Interface: Input and output signal types must be compatible with CMOS logic levels. Substitutes accepting LVTTL input with CMOS/LVCMOS/TTL output capability remain compatible due to logic level overlap in the specified supply voltage range.

Frequency Performance: The substitute maximum frequency must meet or exceed the application requirements. The 574MLFT operates to 160MHz; substitutes with lower maximum frequencies may be acceptable depending on actual circuit operating frequency.

Supply Voltage Range: The substitute must support operation within the 3V to 5.5V supply range or a subset thereof that overlaps with the application's actual supply voltage.

Temperature Range: Operating temperature range of 0°C to 70°C must be supported.

Parameter Comparison

Engineering Selection Recommendations

The 2305A-1HDCG8 is the manufacturer-recommended substitute for the obsolete 574MLFT. Selection of this alternative is supported by the following engineering factors:

Product Status and Availability: The 574MLFT is obsolete with no ongoing manufacturing. The 2305A-1HDCG8 maintains active product status with current inventory availability, ensuring long-term supply chain viability.

Regulatory Compliance: Both devices maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements for equivalent classification.

Package and Mounting Compatibility: Identical 8-SOIC package specifications enable direct PCB footprint compatibility without layout modifications.

Functional Equivalence: Both devices provide zero delay buffer functionality with PLL capability and surface mount implementation suitable for clock distribution applications.

Application-Specific Constraints: Substitution feasibility depends on three application parameters: (1) actual operating frequency must not exceed 133MHz, (2) supply voltage must remain within the 3V to 3.6V range, and (3) the 1:5 output ratio of the 2305A-1HDCG8 must accommodate the application's distribution requirements.

Frequently Asked Questions (FAQ)

Q: Can the 2305A-1HDCG8 directly replace the 574MLFT in all applications?

A: Direct replacement is possible only when the application operates at frequencies ≤ 133MHz and uses supply voltages within the 3V to 3.6V range. The 2305A-1HDCG8 provides 1:5 output distribution versus the 574MLFT's 1:4 ratio; verify that the application can accommodate five outputs or that unused outputs can be left unconnected.

Q: What is the significance of the different input:output ratios (1:4 vs. 1:5)?

A: The ratio indicates the number of output clock signals generated from a single input clock. The 574MLFT produces four synchronized outputs; the 2305A-1HDCG8 produces five. Applications requiring exactly four outputs must verify that the fifth output of the substitute can be safely left unconnected or terminated according to the device datasheet.

Q: Are the LVTTL input and CMOS output specifications of the 2305A-1HDCG8 compatible with CMOS input/output systems?

A: Yes. LVTTL input logic levels are compatible with CMOS signal sources within the overlapping supply voltage range. CMOS outputs from the 2305A-1HDCG8 are compatible with CMOS input receivers.

Q: What is the impact of the reduced maximum frequency (133MHz vs. 160MHz)?

A: The 2305A-1HDCG8 maximum frequency specification is 133MHz. If the application requires operation above 133MHz, this substitute is not suitable. Verify the actual operating frequency of the clock signal in the application; if it is ≤ 133MHz, the lower specification does not impact functionality.

Q: Does the narrower supply voltage range (3V to 3.6V) of the 2305A-1HDCG8 limit its use?

A: The 2305A-1HDCG8 operates within 3V to 3.6V, which is a subset of the 574MLFT's 3V to 5.5V range. Substitution is valid only if the application's actual supply voltage remains within 3V to 3.6V. Applications requiring 5V operation cannot use this substitute.

Q: Are there any differences in packaging or moisture sensitivity?

A: Both devices use identical 8-SOIC packages and have MSL Level 1 (Unlimited) moisture sensitivity, indicating no special moisture control requirements during storage or handling.

Q: What certifications and compliance standards apply to both devices?

A: Both the 574MLFT and 2305A-1HDCG8 are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8542.39.0001.