49FCT3805ASOG Equivalent & Substitute Parts

Part Overview

The 49FCT3805ASOG is a Clock Fanout Buffer (Distribution) IC manufactured by Renesas Electronics Corporation, designed for 1:5 clock distribution applications. This device features CMOS and LVTTL input/output compatibility with a 3V to 3.6V supply voltage range. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

49FCT3805ASOG

Renesas Electronics CorporationIn Stock: 312749FCT3805ASOG Datasheet

Current PartRFQ

49FCT3805AQGI

Renesas Electronics CorporationIn Stock: 131049FCT3805AQGI Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 49FCT3805ASOG is determined by the following critical parameters:

• Base Product Number: Both the main part and substitute must share the 49FCT3805 base designation, ensuring identical functional architecture and pin configuration.
• Type and Ratio: Fanout Buffer (Distribution) with 1:5 input-to-output ratio must be maintained for clock distribution functionality.
• Number of Circuits: Two circuits must be present in the substitute device.
• Signal Compatibility: Input and output signal types (CMOS, LVTTL) must remain consistent.
• Supply Voltage Range: The 3V to 3.6V supply voltage specification must be supported.
• Mounting Type: Surface mount technology must be preserved for PCB integration compatibility.
• Regulatory Compliance: RoHS3 and REACH compliance status must be maintained.

The 49FCT3805AQGI qualifies as a direct substitute based on these parameters, with the primary difference being the package form factor (20-SSOP versus 20-SOIC) and extended operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

The 49FCT3805AQGI is the manufacturer-recommended substitute for the obsolete 49FCT3805ASOG. Both devices maintain identical functional specifications for clock distribution applications, including the 1:5 fanout ratio, dual-circuit architecture, and 3V to 3.6V supply voltage compatibility.

The primary design consideration is the package form factor transition from 20-SOIC to 20-SSOP. The 49FCT3805AQGI features a narrower package width (3.90mm versus 7.50mm), which may require PCB layout modifications for existing designs. The substitute part offers an extended operating temperature range (-40°C to 85°C versus 0°C to 70°C), providing improved thermal performance margins.

Both parts maintain full RoHS3 and REACH compliance, ensuring regulatory alignment for current manufacturing standards. The 49FCT3805AQGI is currently in active production status, providing long-term availability and supply chain stability compared to the obsolete main part.

Frequently Asked Questions (FAQ)

Q: Can the 49FCT3805AQGI be used as a direct replacement for the 49FCT3805ASOG in existing designs?

A: Functional substitution is supported based on identical electrical specifications. However, the package form factor differs (20-SSOP versus 20-SOIC), requiring PCB footprint verification and potential layout modifications. Pin-to-pin compatibility must be confirmed against the specific application schematic.

Q: What is the significance of the package change from SOIC to SSOP?

A: The SSOP package is narrower (3.90mm versus 7.50mm width) while maintaining the same pin count and pitch. This requires a different PCB footprint. The SSOP package may offer space savings in compact designs but necessitates layout redesign for existing boards.

Q: Does the extended operating temperature range of the 49FCT3805AQGI affect compatibility?

A: The substitute part supports a wider temperature range (-40°C to 85°C versus 0°C to 70°C). This provides enhanced thermal performance and is fully backward-compatible with applications requiring the narrower temperature specification of the main part.

Q: Are both parts compliant with current regulatory standards?

A: Both the 49FCT3805ASOG and 49FCT3805AQGI are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

Q: Why is the 49FCT3805ASOG classified as obsolete?

A: The main part has reached end-of-life status in Renesas Electronics' product portfolio. The 49FCT3805AQGI represents the active production alternative, ensuring continued availability and support for clock distribution applications requiring the 49FCT3805 base architecture.