PI49FCT3807BHE Clock Fanout Buffer Equivalent & Substitute Parts

Part Overview

The PI49FCT3807BHE is a Clock Fanout Buffer (Distribution) IC manufactured by Diodes Incorporated, designed for 1:10 clock distribution at 80 MHz in a 20-SSOP package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The 49FCT series provides CMOS/TTL compatible clock buffering for timing-critical applications requiring single-input to ten-output distribution.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI49FCT3807BHE
Manufacturer	Diodes Incorporated
Product Category	Clock/Timing - Fanout Buffer (Distribution)
Type	Fanout Buffer (Distribution)
Ratio - Input:Output	1:10
Frequency - Max	80 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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the PI49FCT3807BHE are grouped based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Ratio - Input:Output: 1:10 (mandatory match)
Package / Case: 20-SSOP (0.209", 5.30mm Width) (mandatory match for PCB compatibility)
Mounting Type: Surface Mount (mandatory match)
Frequency - Max: Equal to or greater than 80 MHz
Voltage - Supply: Compatible with 3V ~ 3.6V range or overlapping supply voltage
Operating Temperature: Must support -40°C ~ 85°C or subset thereof
Input/Output Logic: CMOS/TTL compatible

Substitute Groups:

Group 1: Direct Frequency Upgrade (100 MHz) Parts with 100 MHz maximum frequency, 3V ~ 3.6V supply, 20-SSOP package, and extended temperature range (-40°C ~ 85°C). These are pin-compatible upgrades with higher performance margin.

Group 2: High-Frequency Alternative (166 MHz) Parts with 166 MHz maximum frequency and reduced supply voltage (2.3V ~ 2.7V). These require voltage supply verification but offer significant frequency headroom.

Group 3: Package Variant (20-QSOP) Parts with identical electrical specifications but in 20-QSOP package (0.154", 3.90mm Width). These require PCB layout modification but maintain electrical compatibility.

Parameter Comparison

Parameter	PI49FCT3807BHE (Main)	74FCT20807PYGI / 74FCT20807PYGI8	74FCT3807APYG / 74FCT3807APYG8 / 74FCT3807APYGI / 74FCT3807APYGI8	74FCT3807AQG / 74FCT3807AQG8 / 74FCT3807AQGI / 74FCT3807AQGI8
Manufacturer	Diodes Incorporated	Renesas Electronics Corporation	Renesas Electronics Corporation	Renesas Electronics Corporation
Ratio - Input:Output	1:10	1:10	1:10	1:10
Frequency - Max	80 MHz	166 MHz	100 MHz	100 MHz
Input Logic	CMOS, TTL	LVTTL	LVTTL	LVTTL
Output Logic	CMOS, TTL	LVTTL	CMOS, TTL	CMOS, TTL
Voltage - Supply	3V ~ 3.6V	2.3V ~ 2.7V	3V ~ 3.6V	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C or -40°C ~ 85°C	0°C ~ 70°C or -40°C ~ 85°C
Package / Case	20-SSOP (0.209", 5.30mm)	20-SSOP (0.209", 5.30mm)	20-SSOP (0.209", 5.30mm)	20-QSOP (0.154", 3.90mm)
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (Recommended Primary Path):

Select 74FCT3807APYGI or 74FCT3807APYGI8 (Renesas Electronics Corporation). These parts maintain identical 20-SSOP package dimensions, 3V ~ 3.6V supply voltage range, and CMOS/TTL output compatibility. The 100 MHz maximum frequency exceeds the original 80 MHz specification, providing performance margin. Extended temperature range variants (-40°C ~ 85°C) are available. Product status is active with full ROHS3 compliance and unlimited moisture sensitivity rating.

For High-Frequency Applications:

Select 74FCT20807PYGI or 74FCT20807PYGI8 (Renesas Electronics Corporation) when system design permits 2.3V ~ 2.7V supply voltage operation. These parts provide 166 MHz maximum frequency in identical 20-SSOP packaging. Verify power supply compatibility before selection. Product status is active with ROHS3 compliance.

For Compact PCB Layouts:

Select 74FCT3807AQG8 or 74FCT3807AQGI8 (Renesas Electronics Corporation) when board space permits package transition to 20-QSOP (0.154", 3.90mm Width). Electrical specifications match the 100 MHz SSOP variants. PCB layout modification is required. High inventory availability (21,374 pcs) supports production requirements.

All substitute parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS coding (8542.39.0001) to the original part.

Frequently Asked Questions (FAQ)

Q: Can I use 74FCT20807PYGI as a direct replacement for PI49FCT3807BHE?

A: Electrical substitution is possible due to matching 1:10 ratio and 20-SSOP package. However, the 74FCT20807PYGI operates at 2.3V ~ 2.7V supply voltage, while the PI49FCT3807BHE requires 3V ~ 3.6V. Verify your system power supply can accommodate this reduced voltage range before implementation.

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

A: Both parts are electrically identical with 100 MHz frequency and 3V ~ 3.6V supply. The primary difference is packaging format: APYGI is supplied in Tube packaging, while APYGI8 is supplied in Tape & Reel (TR) format. Select based on assembly process requirements.

Q: Why do some substitute parts have 0°C ~ 70°C temperature range instead of -40°C ~ 85°C?

A: Temperature range variants exist within the same part family. The 74FCT3807APYG and 74FCT3807AQG variants operate 0°C ~ 70°C, while APYGI and AQGI variants extend to -40°C ~ 85°C. Select the temperature range matching your application requirements.

Q: Can I use 74FCT3807AQG8 in place of 74FCT3807APYGI8?

A: Electrical specifications are identical (100 MHz, 3V ~ 3.6V, CMOS/TTL output). However, the package differs: AQG8 uses 20-QSOP (0.154", 3.90mm Width) versus APYGI8 using 20-SSOP (0.209", 5.30mm Width). PCB layout modification is required for package transition.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 (Unlimited) moisture sensitivity rating, matching the original PI49FCT3807BHE specifications.

Q: What is the key difference between LVTTL input and CMOS/TTL input?

A: The PI49FCT3807BHE accepts both CMOS and TTL input levels. The 74FCT20807 series accepts LVTTL (Low Voltage TTL) input only. The 74FCT3807 series accepts LVTTL input with CMOS/TTL output capability. Verify input signal levels in your application before selecting LVTTL-only variants.

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