PI49FCT3807HE Equivalent & Substitute Parts

Part Overview

The PI49FCT3807HE is a Clock Fanout Buffer (Distribution) IC manufactured by Diodes Incorporated, designed for 1:10 clock distribution at 50 MHz in a 20-SSOP package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The PI49FCT3807HE operates with CMOS/TTL input and output compatibility, supply voltage range of 3V to 3.6V, and temperature range of -40°C to 85°C. Its primary function is to distribute a single clock signal to ten output lines while maintaining signal integrity across the fanout network.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Part Number	PI49FCT3807HE
Type	Fanout Buffer (Distribution)
Ratio - Input:Output	1:10
Frequency - Max	50 MHz
Input Logic	CMOS, TTL
Output Logic	CMOS, TTL
Voltage - Supply	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the PI49FCT3807HE is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Ratio - Input:Output: 1:10 (all substitutes maintain this specification)
Package / Case: 20-SSOP or 20-QSOP (mechanically compatible packages)
Voltage - Supply: 3V ~ 3.6V (all substitutes support this range)
Input/Output Logic: CMOS/TTL compatibility required
Mounting Type: Surface Mount

Performance Considerations:

Frequency - Max: Substitutes operate at 100 MHz or 166 MHz, exceeding the original 50 MHz specification
Operating Temperature: Substitutes available in both 0°C ~ 70°C and -40°C ~ 85°C ranges
Product Status: All substitutes are Active, addressing the obsolescence of the original part

Substitutes are grouped by package type (20-SSOP vs. 20-QSOP), operating temperature range, and packaging format (Tube, Tape & Reel, Cut Tape).

Parameter Comparison

Part Number	Manufacturer	Frequency - Max	Operating Temperature	Package / Case	Packaging Format	Product Status	Inventory
PI49FCT3807HE	Diodes Incorporated	50 MHz	-40°C ~ 85°C	20-SSOP (0.209", 5.30mm)	—	Obsolete	3800 Pcs
74FCT3807APYG	Renesas Electronics	100 MHz	0°C ~ 70°C	20-SSOP (0.209", 5.30mm)	Tube	Active	2116 Pcs
74FCT3807APYG8	Renesas Electronics	100 MHz	0°C ~ 70°C	20-SSOP (0.209", 5.30mm)	Cut Tape & Digi-Reel	Active	4300 Pcs
74FCT3807APYGI	Renesas Electronics	100 MHz	-40°C ~ 85°C	20-SSOP (0.209", 5.30mm)	Tube	Active	2076 Pcs
74FCT3807APYGI8	Renesas Electronics	100 MHz	-40°C ~ 85°C	20-SSOP (0.209", 5.30mm)	Tape & Reel	Active	2700 Pcs
74FCT3807AQG	Renesas Electronics	100 MHz	0°C ~ 70°C	20-QSOP (0.154", 3.90mm)	Tube	Active	1700 Pcs
74FCT3807AQG8	Renesas Electronics	100 MHz	0°C ~ 70°C	20-QSOP (0.154", 3.90mm)	Tape & Reel	Active	21374 Pcs
74FCT3807AQGI	Renesas Electronics	100 MHz	-40°C ~ 85°C	20-QSOP (0.154", 3.90mm)	Tube	Active	2106 Pcs
74FCT3807AQGI8	Renesas Electronics	100 MHz	-40°C ~ 85°C	20-QSOP (0.154", 3.90mm)	Tape & Reel	Active	3945 Pcs
74FCT3807DPYGI	Renesas Electronics	166 MHz	-40°C ~ 85°C	20-SSOP (0.209", 5.30mm)	Tube	Active	2300 Pcs
74FCT3807DPYGI8	Renesas Electronics	166 MHz	-40°C ~ 85°C	20-SSOP (0.209", 5.30mm)	Cut Tape & Digi-Reel	Active	3657 Pcs

Engineering Selection Recommendations

For Direct Replacement (Same Package, Same Temperature Range):

Select 74FCT3807APYGI or 74FCT3807APYGI8 for applications requiring the original -40°C to 85°C operating temperature with 20-SSOP packaging. These parts are manufactured by Renesas Electronics, maintain Active product status, and provide 100 MHz operation, which is backward-compatible with the original 50 MHz specification. The APYGI8 variant offers Tape & Reel packaging for high-volume production.

For Extended Performance (Higher Frequency):

Select 74FCT3807DPYGI or 74FCT3807DPYGI8 when the application can benefit from 166 MHz operation while maintaining the -40°C to 85°C temperature range and 20-SSOP package. These parts provide enhanced frequency headroom for future design iterations.

For Compact Packaging (Reduced PCB Footprint):

Select 74FCT3807AQGI or 74FCT3807AQGI8 when the 20-QSOP package (0.154" width) is acceptable. These parts maintain -40°C to 85°C operation and 100 MHz frequency while reducing board space by approximately 26% compared to the 20-SSOP variant.

For Commercial Temperature Range Applications:

Select 74FCT3807APYG or 74FCT3807APYG8 when the application operates within 0°C to 70°C. These parts reduce cost while maintaining 100 MHz performance and 20-SSOP packaging.

All substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance profile of the original part.

Frequently Asked Questions (FAQ)

Q: Can I use a 74FCT3807APYGI as a direct replacement for PI49FCT3807HE?

A: Yes. Both parts maintain 1:10 fanout ratio, 3V to 3.6V supply voltage, CMOS/TTL input/output logic, -40°C to 85°C operating temperature, and 20-SSOP packaging. The 74FCT3807APYGI operates at 100 MHz, which exceeds the original 50 MHz specification and is fully backward-compatible.

Q: What is the difference between 74FCT3807APYGI and 74FCT3807APYGI8?

A: Both parts are electrically identical. The primary difference is packaging format: APYGI is supplied in Tube format, while APYGI8 is supplied in Tape & Reel format. Tape & Reel packaging is preferred for automated assembly and high-volume production.

Q: Can I use the 20-QSOP package variant (74FCT3807AQGI) instead of the 20-SSOP variant?

A: Yes, if your PCB layout permits. The 20-QSOP package is mechanically compatible and electrically equivalent. It reduces package width from 5.30mm to 3.90mm, saving approximately 26% of board space. Verify that your PCB footprint and assembly process support the narrower QSOP package.

Q: Why do some substitutes operate at 100 MHz while others operate at 166 MHz?

A: The 74FCT3807 series includes multiple performance grades. The 100 MHz variants (A-grade) are suitable for most clock distribution applications. The 166 MHz variants (D-grade) provide additional frequency margin for high-speed designs. Both are backward-compatible with the original 50 MHz specification.

Q: What is the difference between the 0°C to 70°C and -40°C to 85°C temperature ranges?

A: The -40°C to 85°C range (I-grade) covers extended industrial and automotive temperature requirements. The 0°C to 70°C range (standard grade) is suitable for commercial and consumer applications. Select based on your application's environmental operating conditions.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitutes are ROHS3 compliant and REACH unaffected, matching the compliance status of the original PI49FCT3807HE.

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