49FCT805ASOGI Equivalent & Substitute Parts

Part Overview

The 49FCT805ASOGI is a Clock Fanout Buffer (Distribution) IC manufactured by Renesas Electronics Corporation, configured as a 1:5 clock distribution buffer in a 20-SOIC package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. The part operates with CMOS and LVTTL input/output compatibility within a 4.75V to 5.25V supply voltage range and supports operating temperatures from -40°C to 85°C.

Key Parameters

Parameter	Value
Manufacturer Part Number	49FCT805ASOGI
Manufacturer	Renesas Electronics Corporation
Category	Clock/Timing
Product Type	Fanout Buffer (Distribution)
Input:Output Ratio	1:5
Number of Circuits	2
Input Logic Levels	CMOS, LVTTL
Output Logic Levels	CMOS, LVTTL
Supply Voltage Range	4.75V ~ 5.25V
Operating Temperature Range	-40°C ~ 85°C
Package Type	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 49FCT805ASOGI is determined by the following critical parameters:

Primary Substitution Criteria:

Clock/Timing category classification
Fanout buffer or clock buffer functional type
Input and output logic level compatibility (CMOS, LVTTL, or compatible standards)
Operating temperature range alignment (-40°C ~ 85°C)
Surface mount packaging capability
Active product status for long-term availability

Secondary Compatibility Factors:

Supply voltage range (original: 4.75V ~ 5.25V; substitute: 1.4V ~ 3.465V represents different voltage domain)
Input:Output ratio (original: 1:5; substitute: 3:10 represents different distribution topology)
Package form factor (original: 20-SOIC; substitute: 32-VFQFN represents different footprint)
Frequency capability (substitute includes 200 MHz maximum frequency specification)

The 8L30210NLGI qualifies as a functional substitute based on shared clock distribution purpose, compatible logic levels (LVTTL output), matching operating temperature range, and active product status. However, differences in voltage supply range, package geometry, and distribution ratio require circuit-level evaluation.

Parameter Comparison

Parameter	49FCT805ASOGI (Main Part)	8L30210NLGI (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Category	Clock/Timing	Clock/Timing
Product Type	Fanout Buffer (Distribution)	Clock Buffer
Input:Output Ratio	1:5	3:10
Number of Circuits	2	1
Output Logic Levels	CMOS, LVTTL	LVCMOS, LVTTL
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package Type	20-SOIC (0.295", 7.50mm Width)	32-VFQFN Exposed Pad (5x5)
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

The 8L30210NLGI is an active product from the same manufacturer (Renesas Electronics Corporation), providing long-term availability and supply chain continuity compared to the obsolete 49FCT805ASOGI. Both parts maintain ROHS3 compliance and operate within the -40°C to 85°C temperature specification.

Selection of the 8L30210NLGI requires verification of:

Circuit compatibility with the 1.4V ~ 3.465V supply voltage range (differs from original 4.75V ~ 5.25V specification)
PCB layout accommodation for the 32-VFQFN package footprint (differs from 20-SOIC)
System tolerance for the 3:10 distribution ratio (differs from 1:5 topology)
Moisture handling procedures appropriate for MSL 3 classification (differs from MSL 1)

Frequently Asked Questions (FAQ)

Q: Can the 8L30210NLGI directly replace the 49FCT805ASOGI without circuit modifications?

A: Direct replacement is not guaranteed. While both are clock distribution buffers from Renesas Electronics Corporation with compatible LVTTL output logic levels and matching operating temperature ranges, the substitute part operates at different supply voltages (1.4V ~ 3.465V versus 4.75V ~ 5.25V), uses a different package footprint (32-VFQFN versus 20-SOIC), and provides a different distribution ratio (3:10 versus 1:5). Circuit-level evaluation is required.

Q: What are the key differences in package handling between these parts?

A: The 49FCT805ASOGI uses a 20-SOIC package with MSL 1 (unlimited moisture sensitivity), while the 8L30210NLGI uses a 32-VFQFN package with MSL 3 (168-hour moisture sensitivity). The VFQFN package includes an exposed pad, requiring different PCB layout and assembly procedures. MSL 3 classification requires moisture control during storage and handling.

Q: Are both parts compliant with current regulatory standards?

A: Both parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components in applicable markets.

Q: What is the significance of the different Input:Output ratios?

A: The 49FCT805ASOGI provides a 1:5 distribution ratio (one input to five outputs), while the 8L30210NLGI provides a 3:10 ratio (three inputs to ten outputs). This difference affects the number of available output channels and the input configuration required by the system design.

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