49FCT805CTSOG Equivalent & Substitute Parts

Part Overview

The 49FCT805CTSOG is a Clock Fanout Buffer (Distribution) IC manufactured by Renesas Electronics Corporation, designed for 1:5 clock distribution in 20-SOIC surface mount packaging. This device features CMOS and LVTTL input/output compatibility with a supply voltage range of 4.5V to 5.5V and operates across 0°C to 70°C. The product is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations where legacy compatibility is required.

Substiute Parts

49FCT805CTSOG

Renesas Electronics CorporationIn Stock: 158749FCT805CTSOG Datasheet

Current PartRFQ

8L30210NLGI

Renesas Electronics CorporationIn Stock: 9638L30210NLGI Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 49FCT805CTSOG is determined by the following critical parameters:

Functional Compatibility Criteria:

• Clock distribution capability with fanout buffer functionality
• Input:Output ratio of 1:5 or higher (allowing one input to drive multiple outputs)
• Input logic level support for CMOS and LVTTL signals
• Output logic level support for CMOS and LVTTL signals

Electrical Compatibility Criteria:

• Supply voltage range that encompasses or exceeds 4.5V ~ 5.5V operation
• Operating temperature range that covers or extends the 0°C ~ 70°C specification

Physical & Compliance Criteria:

• Surface mount packaging suitable for PCB integration
• RoHS3 compliance for environmental and regulatory alignment
• MSL rating appropriate for manufacturing processes

The identified substitute part 8L30210NLGI meets these criteria through its clock buffer functionality, multi-channel output capability, and compliance certifications, though with different electrical specifications and packaging form factor.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The 49FCT805CTSOG is classified as obsolete. The 8L30210NLGI is an active product from the same manufacturer, ensuring ongoing availability, manufacturing support, and compliance with current industry standards.

Compliance & Certification Alignment: Both parts maintain ROHS3 compliance and REACH unaffected status, supporting equivalent environmental and regulatory requirements. The substitute part's active status provides assurance of continued compliance updates and manufacturing consistency.

Functional Capability: The 8L30210NLGI provides a 3:10 input:output ratio, exceeding the 1:5 requirement of the main part. Both devices support LVTTL input and output logic levels, establishing functional compatibility for clock distribution applications. The substitute part's extended input compatibility (HCSL, LVDS, LVPECL, Crystal) provides additional flexibility for diverse signal source integration.

Electrical Operating Range: The substitute part operates at 1.4V ~ 3.465V supply voltage, which does not overlap with the main part's 4.5V ~ 5.5V range. System designs operating at 5V will require voltage regulation or level shifting to accommodate the 8L30210NLGI. The extended operating temperature range of -40°C ~ 85°C provides broader environmental coverage compared to the main part's 0°C ~ 70°C specification.

Packaging & Integration: The transition from 20-SOIC to 32-VFQFN packaging requires PCB layout redesign. The VFQFN package with exposed pad offers improved thermal performance and higher pin density, supporting increased output channel count.

Frequently Asked Questions (FAQ)

Q: Can the 8L30210NLGI directly replace the 49FCT805CTSOG without circuit modifications?

A: Direct pin-for-pin replacement is not possible due to different package types (20-SOIC versus 32-VFQFN) and pinout configurations. Additionally, the supply voltage ranges do not overlap (4.5V~5.5V versus 1.4V~3.465V), requiring voltage regulation or power supply redesign. PCB layout and schematic modifications are necessary.

Q: What is the significance of the 3:10 ratio in the substitute part compared to the 1:5 ratio of the main part?

A: The 3:10 ratio indicates the substitute part can accept 3 independent input channels and distribute to 10 output channels. This provides greater output distribution capability than the main part's 1:5 ratio (1 input to 5 outputs). For applications requiring only 1:5 distribution, the additional outputs remain available for future expansion or can be left unused.

Q: Are the LVTTL input and output specifications compatible between both parts?

A: Yes. Both the 49FCT805CTSOG and 8L30210NLGI support LVTTL input and output logic levels. This establishes functional compatibility for LVTTL-based clock distribution circuits. However, the substitute part's lower supply voltage range requires external voltage regulation to operate at 5V systems.

Q: What does the MSL rating difference (1 versus 3) mean for manufacturing?

A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture precautions. MSL 3 requires moisture control for 168 hours after package opening. The substitute part requires standard moisture handling procedures during assembly, consistent with modern surface mount manufacturing practices.

Q: Is the 200 MHz maximum frequency specification of the substitute part relevant for substitution?

A: The 200 MHz specification indicates the maximum operating frequency of the 8L30210NLGI. If the original 49FCT805CTSOG application operates below 200 MHz, this specification does not constrain substitution. Applications requiring frequency specifications should verify the main part's maximum frequency capability against the substitute part's 200 MHz limit.

Q: Can both parts be used interchangeably in new designs?

A: The 8L30210NLGI is recommended for new designs due to its active product status, extended operating temperature range, and higher frequency capability. The 49FCT805CTSOG should be reserved for legacy system maintenance where existing designs are already qualified and in production.