Equivalent & Substitute Parts for 49FCT805ASOG8

Part Overview

The 49FCT805ASOG8 is a Clock Fanout Buffer (Distribution) IC manufactured by Renesas Electronics Corporation, designed for 1:5 clock distribution in 20-SOIC packaging. This device features CMOS and LVTTL input/output compatibility with a supply voltage range of 4.75V to 5.25V and operates across 0°C to 70°C. The product is classified as obsolete, making equivalent or substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

49FCT805ASOG8

Renesas Electronics CorporationIn Stock: 118149FCT805ASOG8 Datasheet

Current PartRFQ

8L30210NLGI8

Renesas Electronics CorporationIn Stock: 9438L30210NLGI8 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 49FCT805ASOG8 is determined by the following critical parameters:

Functional Compatibility: The substitute part must provide clock distribution/buffering functionality with compatible input and output logic levels (CMOS, LVTTL, or equivalent).

Electrical Parameters: Supply voltage range, input/output voltage compatibility, and frequency capability must support the application requirements of the original design.

Package and Mounting: While the original uses 20-SOIC packaging, substitute parts may use alternative surface-mount packages provided the pin count and signal routing accommodate the design.

Compliance and Availability: The substitute must maintain RoHS3 compliance and be available in active production status to ensure long-term supply chain viability.

The identified substitute, 8L30210NLGI8, operates as a clock buffer with enhanced frequency capability (200 MHz) and broader input compatibility (HCSL, LVCMOS, LVDS, LVPECL, LVTTL, Crystal), though it uses a different package format (32-VFQFN) and operates at lower supply voltages (1.4V ~ 3.465V).

Parameter Comparison

Engineering Selection Recommendations

The 49FCT805ASOG8 is obsolete and no longer in active production. The 8L30210NLGI8 is the manufacturer-recommended substitute and maintains ROHS3 compliance for regulatory requirements.

Key considerations for selection:

Supply Voltage Compatibility: The substitute operates at 1.4V ~ 3.465V, which differs from the original 4.75V ~ 5.25V specification. Design voltage regulation and signal level translation must be evaluated for the target application.

Package Transition: Migration from 20-SOIC to 32-VFQFN requires PCB layout redesign. The substitute offers a larger pin count (32 vs. 20) and different footprint geometry.

Temperature Range: The substitute supports -40°C ~ 85°C, extending the lower operating limit compared to the original 0°C ~ 70°C specification.

Active Production Status: The substitute is in active production, ensuring availability and long-term supply chain support.

Frequently Asked Questions (FAQ)

Q: Can the 8L30210NLGI8 directly replace the 49FCT805ASOG8 without design modifications?

A: Direct pin-for-pin replacement is not possible due to different package types (20-SOIC vs. 32-VFQFN) and pin counts. PCB layout redesign is required. Additionally, the supply voltage range differs significantly (1.4V ~ 3.465V vs. 4.75V ~ 5.25V), requiring voltage regulation adjustments.

Q: What are the key electrical differences between these parts?

A: The main part operates at 5V supply with CMOS/LVTTL logic levels. The substitute operates at lower voltages (1.4V ~ 3.465V) with broader input compatibility (HCSL, LVCMOS, LVDS, LVPECL, LVTTL, Crystal) and higher maximum frequency (200 MHz). Output compatibility remains LVCMOS and LVTTL.

Q: Are both parts RoHS3 compliant?

A: Yes, both the 49FCT805ASOG8 and 8L30210NLGI8 are ROHS3 compliant, meeting environmental and regulatory requirements.

Q: What is the impact of the different package types on board design?

A: The 20-SOIC package has a smaller footprint than the 32-VFQFN. The substitute's larger package and increased pin count require PCB redesign, including new trace routing and potentially different board area allocation.

Q: Is the substitute suitable for legacy system maintenance?

A: The substitute can be used for new designs but requires design modifications. For legacy system maintenance where the original 49FCT805ASOG8 is still required, alternative sources or inventory management strategies should be evaluated.