49FCT805CTQG Clock Fanout Buffer IC - Equivalent & Substitute Parts

Part Overview

The 49FCT805CTQG is a clock fanout buffer (distribution) IC manufactured by Renesas Electronics Corporation, designed for 1:5 clock signal distribution in 20-SSOP surface mount packaging. This part operates with CMOS and LVTTL input/output compatibility and a supply voltage range of 4.5V to 5.5V. The 49FCT805CTQG is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

Key Parameters

Parameter	Value
Manufacturer Part Number	49FCT805CTQG
Manufacturer	Renesas Electronics Corporation
Product Category	Clock/Timing - Fanout Buffer (Distribution)
Type	Fanout Buffer (Distribution)
Ratio - Input:Output	1:5
Number of Circuits	2
Input Type	CMOS, LVTTL
Output Type	CMOS, LVTTL
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package / Case	20-SSOP (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 49FCT805CTQG is determined by the following critical parameters:

Primary Substitution Criteria:

Input:Output Ratio: 1:5 (mandatory match)
Package / Case: 20-SSOP (0.154", 3.90mm Width) (mandatory match for PCB compatibility)
Number of Circuits: 2 (mandatory match)
Mounting Type: Surface Mount (mandatory match)
Input/Output Logic Compatibility: CMOS and/or TTL support (functional compatibility)
Differential Input/Output: No/No (mandatory match)

Secondary Compatibility Factors:

Voltage Supply Range: Substitute parts must operate within or encompass the original 4.5V ~ 5.5V range
Operating Temperature Range: Extended temperature ranges (-40°C ~ 85°C) are acceptable for industrial applications
Product Status: Active parts are preferred over obsolete parts for long-term availability
RoHS and Compliance Status: ROHS3 compliance maintained across all substitutes

The 49FCT805CTQG's obsolete status necessitates active alternatives. All listed substitutes maintain the 1:5 fanout buffer architecture in identical 20-SSOP packaging, ensuring direct PCB compatibility while offering improved frequency performance and extended operating temperature ranges.

Parameter Comparison

Parameter	49FCT805CTQG	PI49FCT32805QE	PI49FCT32805QEX	PI49FCT3805AQEX	PI49FCT3805BQE	PI49FCT3805BQEX	PI49FCT3805CQE	PI49FCT3805CQEX	PI49FCT3805DQE	PI49FCT3805DQEX
Manufacturer	Renesas	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.
Ratio - Input:Output	1:5	1:5	1:5	1:5	1:5	1:5	1:5	1:5	1:5	1:5
Number of Circuits	2	2	2	2	2	2	2	2	2	2
Package / Case	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP
Input Type	CMOS, LVTTL	CMOS	CMOS	CMOS, TTL	CMOS, TTL	CMOS, TTL	CMOS, TTL	CMOS, TTL	CMOS, TTL	CMOS, TTL
Output Type	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS
Frequency - Max	Not specified	133 MHz	133 MHz	66 MHz	80 MHz	80 MHz	100 MHz	100 MHz	133 MHz	133 MHz
Voltage - Supply	4.5V ~ 5.5V	2.97V ~ 3.63V	2.97V ~ 3.63V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All substitute parts listed maintain ROHS3 compliance and identical MSL ratings, ensuring regulatory and environmental compatibility with the original 49FCT805CTQG. The substitutes are manufactured by Diodes Incorporated and classified as active products, providing long-term availability and supply chain stability compared to the obsolete Renesas original.

Voltage Supply Consideration: The original 49FCT805CTQG operates at 4.5V ~ 5.5V (5V logic), while all Diodes Incorporated substitutes operate at 3V ~ 3.6V (3.3V logic) or 2.97V ~ 3.63V (3.3V logic). This represents a fundamental voltage domain difference. Direct substitution requires circuit-level voltage compatibility assessment. If the application requires 5V operation, alternative solutions outside this substitute list must be evaluated.

Frequency Performance: The original part does not specify maximum frequency. Substitute parts range from 66 MHz to 133 MHz, providing defined frequency specifications for design margin calculation and signal integrity analysis.

Temperature Range: Substitute parts extend the operating temperature range to -40°C ~ 85°C, supporting industrial and extended-temperature applications beyond the original 0°C ~ 70°C specification.

Packaging Options: Substitutes are available in both Tube and Tape & Reel (TR) packaging formats, accommodating different production and assembly workflows.

Frequently Asked Questions (FAQ)

Q: Can the PI49FCT32805QE directly replace the 49FCT805CTQG on existing PCBs?

A: Yes, from a physical and functional perspective. Both parts use identical 20-SSOP packaging with matching pinout for 1:5 fanout buffer operation. However, the voltage supply domain differs: the original operates at 4.5V ~ 5.5V while the substitute operates at 2.97V ~ 3.63V. Verify that your circuit power supply and signal levels are compatible with 3.3V logic before implementation.

Q: What is the primary difference between PI49FCT3805AQEX, PI49FCT3805BQE, PI49FCT3805CQE, and PI49FCT3805DQE?

A: These parts differ in maximum frequency specification: 66 MHz, 80 MHz, 100 MHz, and 133 MHz respectively. All maintain identical 1:5 fanout buffer architecture, 20-SSOP packaging, and 3V ~ 3.6V supply voltage. Select the frequency grade matching your application's clock distribution requirements.

Q: What does the "QEX" suffix indicate compared to "QE"?

A: The "QEX" suffix indicates Tape & Reel (TR) packaging format, while "QE" indicates Tube packaging. Both contain identical die and electrical specifications. Selection depends on production assembly equipment and volume requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitutes maintain ROHS3 compliance, matching the original 49FCT805CTQG certification status. All parts are REACH Unaffected with EAR99 export classification.

Q: What is the MSL rating and why does it matter?

A: All parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity constraints during storage and handling. This simplifies inventory management and eliminates bake-out requirements prior to assembly.

Q: Can I use PI49FCT32805QE in a 5V system?

A: No. The PI49FCT32805QE operates at 2.97V ~ 3.63V (3.3V logic domain) and is not rated for 4.5V ~ 5.5V operation. Using this part in a 5V system will result in device damage or malfunction. Confirm your system voltage before selection.

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