74FCT807CTQG Clock Fanout Buffer Equivalent & Substitute Parts

Part Overview

The 74FCT807CTQG is a Clock Fanout Buffer (Distribution) IC manufactured by Renesas Electronics Corporation, designed for 1:10 clock distribution at 100 MHz. This part operates with TTL input/output logic levels and a 4.75V to 5.25V supply voltage range. The device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

The 74FCT807CTQG is packaged in a 20-SSOP (0.154", 3.90mm Width) surface mount configuration with unlimited moisture sensitivity rating (MSL 1). Identifying compatible substitutes requires matching the 1:10 fanout ratio, frequency capability, logic family compatibility, and package specifications.

Substiute Parts

74FCT807CTQG

Renesas Electronics CorporationIn Stock: 142074FCT807CTQG Datasheet

Current PartRFQ

74FCT3807SNDGI

Renesas Electronics CorporationIn Stock: 100474FCT3807SNDGI Datasheet

MFR RecommendedRFQ

PI49FCT32807QE

Diodes IncorporatedIn Stock: 7173PI49FCT32807QE Datasheet

MFR RecommendedRFQ

PI49FCT32807QEX

Diodes IncorporatedIn Stock: 5243PI49FCT32807QEX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74FCT807CTQG is determined by the following critical parameters:

Primary Substitution Criteria:

• Fanout ratio of 1:10 (input to output)
• Surface mount packaging compatible with 20-pin configurations
• Frequency capability equal to or exceeding 100 MHz
• Logic family compatibility (TTL input/output or compatible logic levels)
• Supply voltage range that accommodates 5V operation

Substitute Parts Identified:

1. 74FCT3807SNDGI (Renesas Electronics Corporation) – Active product with enhanced frequency (200 MHz) and extended temperature range. Package: 20-VFQFN Exposed Pad. Supports wider voltage range (1.71V ~ 3.45V) with LVTTL input and CMOS/TTL output compatibility.

2. PI49FCT32807QE (Diodes Incorporated) – Active product with 133 MHz frequency capability. Package: 20-SSOP (0.154", 3.90mm Width), identical to the original part. CMOS input/output logic with 2.97V ~ 3.63V supply range.

3. PI49FCT32807QEX (Diodes Incorporated) – Functionally identical to PI49FCT32807QE with Tape & Reel packaging. Same electrical specifications and 20-SSOP package footprint.

All substitute parts maintain the 1:10 fanout ratio and surface mount configuration. The 74FCT3807SNDGI offers the highest frequency margin and extended operating temperature. The PI49FCT32807QE and PI49FCT32807QEX variants provide package-compatible alternatives with CMOS logic levels.

Parameter Comparison

Engineering Selection Recommendations

For Direct Package Compatibility (20-SSOP): Select PI49FCT32807QE or PI49FCT32807QEX. Both parts maintain the identical 20-SSOP (0.154", 3.90mm Width) package footprint as the original 74FCT807CTQG, enabling direct PCB layout reuse. These parts are active products with ROHS3 compliance and unlimited MSL rating. The 133 MHz frequency capability exceeds the original 100 MHz specification, providing performance margin. Note that these parts operate at 3.3V nominal supply voltage rather than 5V, requiring circuit-level voltage compatibility verification.

For Enhanced Performance and Extended Temperature Range: Select 74FCT3807SNDGI. This Renesas part offers 200 MHz frequency capability and operates across -40°C to 105°C, compared to the original 0°C to 70°C range. The 20-VFQFN Exposed Pad package differs from the original 20-SSOP, requiring PCB layout modification. The part supports both LVTTL input and CMOS/TTL output, providing flexible logic level interfacing. ROHS3 compliance and unlimited MSL rating are confirmed.

Compliance Considerations: All substitute parts carry ROHS3 compliance and REACH Unaffected status, meeting modern environmental and regulatory requirements. The original 74FCT807CTQG is classified as obsolete; all recommended substitutes are active products with ongoing manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can PI49FCT32807QE replace 74FCT807CTQG in a 5V system? A: PI49FCT32807QE operates at 2.97V to 3.63V supply voltage, not 5V. Direct substitution in a 5V-only system requires voltage level translation or circuit redesign. Verify that your system can accommodate 3.3V logic levels before selection.

Q: What is the primary difference between PI49FCT32807QE and PI49FCT32807QEX? A: Both parts are electrically identical with the same 20-SSOP package and 133 MHz frequency. The difference is packaging format: PI49FCT32807QE is supplied in Tube packaging, while PI49FCT32807QEX is supplied in Tape & Reel (TR) format. Select based on your assembly process requirements.

Q: Why does 74FCT3807SNDGI use a different package (20-VFQFN) than the original? A: The 20-VFQFN Exposed Pad package represents a modern package evolution for this device family, offering improved thermal performance and smaller footprint. This package change requires PCB layout redesign and is not a direct drop-in replacement. Select this part only if your design can accommodate the new package footprint.

Q: Are all substitute parts RoHS compliant? A: Yes. All three substitute parts (74FCT3807SNDGI, PI49FCT32807QE, and PI49FCT32807QEX) are ROHS3 compliant. The original 74FCT807CTQG RoHS status is not specified in the available data.

Q: What is the frequency margin when using PI49FCT32807QE as a substitute? A: PI49FCT32807QE operates at 133 MHz maximum frequency, compared to the original 100 MHz specification. This provides a 33 MHz frequency margin, or 33% performance headroom above the original part's rated capability.

Q: Can I use 74FCT3807SNDGI in applications requiring 0°C to 70°C operation? A: Yes. The 74FCT3807SNDGI operating temperature range is -40°C to 105°C, which fully encompasses the original 0°C to 70°C range. This part is suitable for the original temperature specification and extends capability to wider temperature extremes.

Q: What is the moisture sensitivity rating for all substitute parts? A: All substitute parts carry MSL 1 (Unlimited) moisture sensitivity rating, identical to the original 74FCT807CTQG. No special moisture control measures are required during storage or handling.