49FCT805SOG Equivalent & Substitute Parts

Part Overview

The 49FCT805SOG 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 part operates with CMOS and LVTTL input/output compatibility and a supply voltage range of 4.75V to 5.25V. The 49FCT805SOG is classified as obsolete, making identification of functionally equivalent substitute components essential for ongoing system design and maintenance applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	49FCT805SOG
Manufacturer	Renesas Electronics Corporation
Category	Clock/Timing
Type	Fanout Buffer (Distribution)
Ratio - Input:Output	1:5
Input Logic	CMOS, LVTTL
Output Logic	CMOS, LVTTL
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 49FCT805SOG requires evaluation of functional clock distribution capability while accounting for differences in electrical specifications and packaging constraints. The primary substitute identified is the 8L30210NLGI, which provides clock buffer functionality with expanded input/output compatibility and higher frequency capability.

Substitution logic is based on the following criteria:

Clock distribution function (fanout buffer operation)
Input and output logic level compatibility (LVTTL support)
Surface mount packaging availability
Active product status and ongoing manufacturer support
RoHS3 compliance and environmental certifications

The 8L30210NLGI operates at higher frequency (200 MHz maximum) and supports a broader range of input logic standards (HCSL, LVCMOS, LVDS, LVPECL, LVTTL, Crystal) compared to the 49FCT805SOG. However, the substitute operates at lower supply voltages (1.4V ~ 3.465V) and uses a different package format (32-VFQFN Exposed Pad versus 20-SOIC).

Parameter Comparison

Parameter	49FCT805SOG	8L30210NLGI
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Category	Clock/Timing	Clock/Timing
Type	Fanout Buffer (Distribution)	Clock Buffer
Input Logic Levels	CMOS, LVTTL	HCSL, LVCMOS, LVDS, LVPECL, LVTTL, Crystal
Output Logic Levels	CMOS, LVTTL	LVCMOS, LVTTL
Voltage - Supply	4.75V ~ 5.25V	1.4V ~ 3.465V
Frequency - Max	Not specified	200 MHz
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)	32-VFQFN Exposed Pad (5x5)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

The 8L30210NLGI is an active product with current manufacturer support, addressing the obsolescence status of the 49FCT805SOG. Both components maintain ROHS3 compliance and are manufactured by Renesas Electronics Corporation, ensuring consistent quality and environmental standards.

Selection of the 8L30210NLGI as a substitute requires verification of the following design considerations:

Supply voltage compatibility: The 8L30210NLGI operates at 1.4V ~ 3.465V, which differs from the 49FCT805SOG's 4.75V ~ 5.25V specification. System power supply architecture must accommodate this voltage range.
Package footprint: The 32-VFQFN Exposed Pad package differs from the 20-SOIC package, requiring PCB layout modifications and potential rerouting of signal traces.
Input/output ratio: The 8L30210NLGI provides a 3:10 ratio versus the 49FCT805SOG's 1:5 ratio, affecting clock distribution topology.
Operating temperature range: The 8L30210NLGI supports -40°C ~ 85°C, providing extended low-temperature operation compared to the 49FCT805SOG's 0°C ~ 70°C range.
Moisture sensitivity: The 8L30210NLGI has MSL 3 (168 Hours) versus MSL 1 (Unlimited), requiring stricter moisture control during storage and handling.

Frequently Asked Questions (FAQ)

Q: Can the 8L30210NLGI directly replace the 49FCT805SOG without PCB modifications?

A: No. The 8L30210NLGI uses a 32-VFQFN Exposed Pad package while the 49FCT805SOG uses a 20-SOIC package. PCB layout redesign is required, including footprint changes, trace rerouting, and via placement adjustments.

Q: What are the voltage supply differences between these parts?

A: The 49FCT805SOG operates at 4.75V ~ 5.25V (5V nominal), while the 8L30210NLGI operates at 1.4V ~ 3.465V (3.3V nominal). System power supply architecture must be modified to accommodate the lower voltage requirement of the substitute.

Q: Are both parts RoHS compliant?

A: Yes. Both the 49FCT805SOG and 8L30210NLGI are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the significance of the different input/output ratios?

A: The 49FCT805SOG provides 1:5 clock distribution (one input to five outputs), while the 8L30210NLGI provides 3:10 distribution (three inputs to ten outputs). System clock tree architecture and signal routing must be evaluated to determine compatibility with the different ratio.

Q: How do the operating temperature ranges differ?

A: The 49FCT805SOG operates from 0°C ~ 70°C, while the 8L30210NLGI operates from -40°C ~ 85°C. The substitute provides extended low-temperature operation, which may be beneficial for industrial or aerospace applications.

Q: What is the impact of the different MSL ratings?

A: The 49FCT805SOG has MSL 1 (Unlimited moisture sensitivity level), while the 8L30210NLGI has MSL 3 (168 Hours). The substitute requires stricter moisture control during storage, with exposure limited to 168 hours at specified humidity levels before reflow soldering.

Q: Are the input and output logic levels compatible?

A: Both parts support LVTTL input and output. The 8L30210NLGI additionally supports HCSL, LVCMOS, LVDS, and LVPECL inputs, and LVCMOS outputs, providing greater flexibility for mixed-signal system integration.

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