74FCT807CTSOG8 Equivalent & Substitute Parts

Part Overview

The 74FCT807CTSOG8 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 features TTL input and output compatibility, operates on a 4.75V to 5.25V supply voltage, and is housed in a 20-SOIC package.

The 74FCT807CTSOG8 is classified as an obsolete product. Due to its discontinued status, sourcing new units may become increasingly difficult. Identifying qualified substitute parts ensures design continuity and supply chain reliability for applications requiring clock distribution functionality.

Substiute Parts

74FCT807CTSOG8

Renesas Electronics CorporationIn Stock: 109374FCT807CTSOG8 Datasheet

Current PartRFQ

74FCT3807SNDGI8

Renesas Electronics CorporationIn Stock: 85674FCT3807SNDGI8 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74FCT807CTSOG8 is determined by the following critical parameters:

• Fanout Ratio: Must maintain 1:10 input-to-output distribution capability
• Frequency Performance: Substitute must support the required clock frequency range for the application
• Logic Family Compatibility: Input and output logic levels must be compatible with the system design
• Supply Voltage Range: Operating voltage must overlap with or encompass the original specification
• Operating Temperature Range: Must cover the thermal requirements of the application
• Package and Mounting: Physical form factor and mounting method must be compatible with PCB design

The 74FCT3807SNDGI8 qualifies as a substitute based on these parameters. While it offers enhanced specifications (200 MHz maximum frequency, wider supply voltage range, extended temperature range, and RoHS3 compliance), it maintains the core 1:10 fanout ratio and compatible logic signaling required for direct functional replacement.

Parameter Comparison

Engineering Selection Recommendations

The 74FCT3807SNDGI8 is the manufacturer-recommended substitute for the obsolete 74FCT807CTSOG8. Selection of this substitute is supported by the following factors:

• Active Product Status: The 74FCT3807SNDGI8 is an active product with confirmed ongoing availability, eliminating supply chain risk associated with the obsolete 74FCT807CTSOG8.
• Regulatory Compliance: The substitute is ROHS3 compliant, meeting current environmental and regulatory requirements for electronic components.
• Enhanced Performance Specifications: The substitute provides higher maximum frequency (200 MHz versus 100 MHz) and extended operating temperature range (-40°C to 105°C versus 0°C to 70°C), offering greater design margin and flexibility.
• Functional Equivalence: Both devices maintain identical 1:10 fanout ratio and compatible logic signaling, ensuring functional compatibility in clock distribution applications.
• Package Consideration: The substitute uses a 20-VFQFN package instead of 20-SOIC. PCB layout modifications are required to accommodate the different package footprint.

Frequently Asked Questions (FAQ)

Q: Can the 74FCT3807SNDGI8 directly replace the 74FCT807CTSOG8 without circuit modifications?

A: Functional replacement is possible due to identical 1:10 fanout ratio and compatible logic signaling. However, the package change from 20-SOIC to 20-VFQFN requires PCB layout redesign. Additionally, the substitute operates on a different supply voltage range (1.71V ~ 3.45V versus 4.75V ~ 5.25V), necessitating verification that the application's power supply is compatible.

Q: What is the significance of the supply voltage difference between these parts?

A: The original 74FCT807CTSOG8 requires a 5V supply rail (4.75V ~ 5.25V), while the 74FCT3807SNDGI8 operates on a lower voltage range (1.71V ~ 3.45V). Applications using 5V logic systems must confirm that the substitute can be powered from the available supply voltage before implementation.

Q: Does the package change affect signal integrity?

A: The 20-VFQFN package used by the substitute differs physically from the 20-SOIC package of the original part. PCB routing, trace lengths, and layer stackup may require adjustment to maintain signal integrity for 100 MHz clock distribution. The exposed pad in the VFQFN package provides improved thermal performance compared to SOIC.

Q: Are there any compatibility concerns with the LVTTL input specification of the substitute?

A: The substitute accepts LVTTL input signals, which are compatible with TTL output levels from the original specification. LVTTL inputs have lower threshold voltages than standard TTL, but TTL output levels will reliably drive LVTTL inputs in typical applications.

Q: What is the impact of the extended operating temperature range?

A: The substitute's extended range (-40°C to 105°C versus 0°C to 70°C) provides greater thermal margin for applications operating in wider environmental conditions. This enhancement does not create compatibility issues for applications within the original temperature range.