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PI49FCT3807AS Clock Fanout Buffer Equivalent & Substitute Parts
Part Overview
The PI49FCT3807AS is a Clock Fanout Buffer (Distribution) IC manufactured by Diodes Incorporated, designed for 1:10 clock distribution at 66 MHz in a 20-SOIC surface mount package. This part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The 74FCT3807 series from Renesas Electronics Corporation provides direct functional equivalents with enhanced specifications and active product status.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | PI49FCT3807AS |
| Manufacturer | Diodes Incorporated |
| Category | Clock/Timing |
| Type | Fanout Buffer (Distribution) |
| Number of Circuits | 1 |
| Ratio - Input:Output | 1:10 |
| Input Type | CMOS, TTL |
| Output Type | CMOS, TTL |
| Frequency - Max | 66 MHz |
| Voltage - Supply | 3V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the PI49FCT3807AS is determined by the following critical parameters:
Electrical Compatibility:
- Ratio - Input:Output: 1:10 (all substitutes maintain this specification)
- Input/Output Logic Types: CMOS and TTL compatible (all substitutes support LVTTL input and CMOS/TTL output)
- Voltage - Supply: 3V ~ 3.6V (all substitutes operate within this range)
- Package / Case: 20-SOIC (0.295", 7.50mm Width) (all substitutes use identical package)
Mechanical Compatibility:
- Mounting Type: Surface Mount (all substitutes are surface mount)
- Supplier Device Package: 20-SOIC (all substitutes use this package designation)
Performance Enhancement:
- Frequency - Max: The PI49FCT3807AS operates at 66 MHz maximum. All Renesas 74FCT3807 series substitutes operate at 100 MHz, providing higher frequency capability while maintaining backward compatibility with lower frequency applications.
Temperature Range Variants: Substitutes are available in two operating temperature ranges:
- 0°C ~ 70°C (commercial grade): 74FCT3807ASOG, 74FCT3807SOG, 74FCT3807ASOG8, 74FCT3807SOG8
- -40°C ~ 85°C (industrial grade): 74FCT3807ASOGI, 74FCT3807SOGI, 74FCT3807ASOGI8, 74FCT3807SOGI8
Packaging Format Variants:
- Tube packaging: 74FCT3807ASOG, 74FCT3807ASOGI, 74FCT3807SOG, 74FCT3807SOGI
- Tape & Reel (TR) packaging: 74FCT3807ASOG8, 74FCT3807ASOGI8, 74FCT3807SOG8, 74FCT3807SOGI8
Parameter Comparison
| Parameter | PI49FCT3807AS | 74FCT3807ASOG / 74FCT3807SOG | 74FCT3807ASOG8 / 74FCT3807SOG8 | 74FCT3807ASOGI / 74FCT3807SOGI | 74FCT3807ASOGI8 / 74FCT3807SOGI8 |
|---|---|---|---|---|---|
| Manufacturer | Diodes Incorporated | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Type | Fanout Buffer (Distribution) | Fanout Buffer (Distribution) | Fanout Buffer (Distribution) | Fanout Buffer (Distribution) | Fanout Buffer (Distribution) |
| Ratio - Input:Output | 1:10 | 1:10 | 1:10 | 1:10 | 1:10 |
| Input Type | CMOS, TTL | LVTTL | LVTTL | LVTTL | LVTTL |
| Output Type | CMOS, TTL | CMOS, TTL | CMOS, TTL | CMOS, TTL | CMOS, TTL |
| Frequency - Max | 66 MHz | 100 MHz | 100 MHz | 100 MHz | 100 MHz |
| Voltage - Supply | 3V ~ 3.6V | 3V ~ 3.6V | 3V ~ 3.6V | 3V ~ 3.6V | 3V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C | 0°C ~ 70°C | 0°C ~ 70°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Product Status | Obsolete | Active | Active | Active | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| Packaging Format | Not specified | Tube | Tape & Reel (TR) | Tube | Tape & Reel (TR) |
Engineering Selection Recommendations
For New Designs and Production: Select from the active Renesas 74FCT3807 series substitutes. All variants maintain electrical and mechanical compatibility with the obsolete PI49FCT3807AS while providing enhanced frequency capability (100 MHz vs. 66 MHz) and ROHS3 compliance.
Temperature Range Selection:
- For applications requiring -40°C ~ 85°C industrial temperature range: Select 74FCT3807ASOGI, 74FCT3807SOGI, 74FCT3807ASOGI8, or 74FCT3807SOGI8
- For applications operating within 0°C ~ 70°C commercial temperature range: Select 74FCT3807ASOG, 74FCT3807SOG, 74FCT3807ASOG8, or 74FCT3807SOG8
Packaging Format Selection:
- For tube packaging: Select variants ending in "G" or "GI" (without "8" suffix)
- For Tape & Reel (TR) packaging: Select variants ending in "G8" or "GI8"
Compliance Considerations: All Renesas 74FCT3807 series substitutes are ROHS3 compliant, addressing the RoHS non-compliance status of the original PI49FCT3807AS. This is essential for applications subject to environmental regulations and modern supply chain requirements.
Frequently Asked Questions (FAQ)
Q: Can the 74FCT3807 series directly replace the PI49FCT3807AS without circuit modifications?
A: Yes. The 74FCT3807 series maintains identical electrical specifications for supply voltage (3V ~ 3.6V), input/output logic types (LVTTL input, CMOS/TTL output), 1:10 distribution ratio, and 20-SOIC package dimensions. The higher maximum frequency (100 MHz vs. 66 MHz) is a performance enhancement that does not require circuit changes for applications operating at or below 66 MHz.
Q: What is the difference between the "G" and "GI" suffix variants?
A: The suffix indicates the operating temperature range. "G" variants (74FCT3807ASOG, 74FCT3807SOG) operate at 0°C ~ 70°C commercial temperature range. "GI" variants (74FCT3807ASOGI, 74FCT3807SOGI) operate at -40°C ~ 85°C industrial temperature range. Select based on your application's thermal requirements.
Q: What is the difference between tube and Tape & Reel (TR) packaging?
A: Tube packaging is suitable for manual handling and smaller quantity orders. Tape & Reel (TR) packaging (indicated by "8" suffix) is designed for automated assembly equipment and high-volume production. Both formats contain identical components; the difference is in delivery and handling method.
Q: Why is the PI49FCT3807AS classified as obsolete?
A: The PI49FCT3807AS is no longer in active production by Diodes Incorporated. The Renesas 74FCT3807 series provides superior specifications, active product status, and regulatory compliance (ROHS3), making it the recommended replacement for all new designs and ongoing production.
Q: Are there any electrical differences between the input specifications of the original and substitute parts?
A: The original PI49FCT3807AS accepts CMOS and TTL inputs. The 74FCT3807 series substitutes accept LVTTL (Low Voltage TTL) input, which is a subset of TTL specifications and maintains compatibility with standard TTL and CMOS logic levels at the specified 3V ~ 3.6V supply voltage.
Q: What inventory levels are available for the substitute parts?
A: Renesas 74FCT3807 series substitutes have active inventory ranging from 809 to 1670 pieces across all variants, compared to 718 pieces for the obsolete PI49FCT3807AS. This ensures reliable supply for production requirements.
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