74FCT807BTSOG Equivalent & Substitute Parts

Part Overview

The 74FCT807BTSOG is a Clock Fanout Buffer (Distribution) IC manufactured by Renesas Electronics Corporation, designed for 1:10 clock distribution applications with a maximum frequency of 100 MHz. This device operates with TTL input and output levels, utilizing a 20-SOIC surface mount package.

The 74FCT807BTSOG is classified as obsolete. Locating equivalent or substitute components is necessary to support ongoing system maintenance, design updates, or production continuity where this part is no longer readily available through standard distribution channels.

Key Parameters

Parameter	Value
Manufacturer Part Number	74FCT807BTSOG
Manufacturer	Renesas Electronics Corporation
Category	Clock/Timing
Type	Fanout Buffer (Distribution)
Ratio - Input:Output	1:10
Frequency - Max	100 MHz
Input Logic Level	TTL
Output Logic Level	TTL
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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74FCT807BTSOG is based on the following core functional and electrical parameters:

Fanout Buffer Function: Both main and substitute parts must provide 1:10 clock distribution capability
Input/Output Logic Compatibility: The substitute must support TTL or compatible logic levels (LVTTL input with TTL/CMOS output is acceptable for TTL systems)
Frequency Performance: The substitute must meet or exceed the maximum frequency requirement of 100 MHz
Supply Voltage Range: The substitute must operate within or encompass the 4.75V ~ 5.25V supply range
Operating Temperature Range: The substitute must support the required temperature range
Package Compatibility: Physical package dimensions and pin configuration must be compatible with the application

The 74FCT3807SNDGI qualifies as a substitute based on these parameters, with enhanced performance characteristics including higher frequency capability (200 MHz) and extended temperature range support.

Parameter Comparison

Parameter	74FCT807BTSOG (Main Part)	74FCT3807SNDGI (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Series	74FCT	74FCT
Type	Fanout Buffer (Distribution)	Fanout Buffer (Distribution)
Number of Circuits	1	1
Ratio - Input:Output	1:10	1:10
Differential - Input:Output	No/No	No/No
Input Logic Level	TTL	LVTTL
Output Logic Level	TTL	CMOS, TTL
Frequency - Max	100 MHz	200 MHz
Voltage - Supply	4.75V ~ 5.25V	1.71V ~ 3.45V
Operating Temperature	0°C ~ 70°C	-40°C ~ 105°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	20-SOIC (0.295", 7.50mm Width)	20-VFQFN Exposed Pad (3x3)
Product Status	Obsolete	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
RoHS Status	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

The 74FCT3807SNDGI is an active product from the same manufacturer and series, providing functional equivalence to the obsolete 74FCT807BTSOG. Key considerations for selection:

Functional Compatibility: Both devices provide identical 1:10 fanout buffer functionality with compatible logic level support. The substitute's LVTTL input and dual CMOS/TTL output capability maintain compatibility with TTL-based systems.

Performance Enhancement: The 74FCT3807SNDGI offers doubled maximum frequency (200 MHz versus 100 MHz), providing performance margin for existing and future applications.

Supply Voltage Difference: The substitute operates at 1.71V ~ 3.45V, which does not overlap with the main part's 4.75V ~ 5.25V range. System power supply architecture must be evaluated to determine compatibility.

Temperature Range Extension: The substitute supports -40°C ~ 105°C, exceeding the main part's 0°C ~ 70°C range, enabling use in extended temperature applications.

Package Change: The substitute uses a 20-VFQFN package (3x3mm) instead of the 20-SOIC package. PCB layout and footprint modifications are required.

Compliance Status: The 74FCT3807SNDGI is ROHS3 compliant and active in production, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the 74FCT3807SNDGI directly replace the 74FCT807BTSOG without modifications?

A: Direct pin-for-pin replacement is not possible due to package differences (20-SOIC versus 20-VFQFN). PCB layout redesign is required. Additionally, the supply voltage range differs significantly, requiring power supply circuit evaluation.

Q: What is the primary reason for substitution?

A: The 74FCT807BTSOG is obsolete. The 74FCT3807SNDGI is an active equivalent from the same manufacturer providing the same 1:10 fanout buffer functionality with enhanced performance specifications.

Q: Are the logic levels compatible between these parts?

A: Yes. The substitute's LVTTL input and TTL output capability are compatible with TTL-based systems. The additional CMOS output option provides flexibility for mixed-signal applications.

Q: What is the impact of the different supply voltage ranges?

A: The main part requires 4.75V ~ 5.25V (5V nominal), while the substitute requires 1.71V ~ 3.45V (3.3V nominal). System power architecture must be modified to support the substitute's lower voltage requirement.

Q: Does the package change affect signal integrity?

A: The 20-VFQFN package (3x3mm) is smaller than the 20-SOIC package. PCB layout must be redesigned to accommodate the new package footprint and pin spacing.

Q: Is the substitute suitable for extended temperature applications?

A: Yes. The 74FCT3807SNDGI supports -40°C ~ 105°C, compared to the main part's 0°C ~ 70°C range, enabling deployment in wider temperature environments.

Q: What compliance certifications apply to the substitute?

A: The 74FCT3807SNDGI is ROHS3 compliant and carries REACH Unaffected status, consistent with the main part's regulatory classification.

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