PI49FCT3807CQ Equivalent & Substitute Parts

Part Overview

The PI49FCT3807CQ is a Clock Fanout Buffer (Distribution) IC manufactured by Diodes Incorporated, designed for 1:10 clock distribution at 100 MHz. This part operates with CMOS/TTL input and output compatibility, supporting supply voltages from 3V to 3.6V across an operating temperature range of -40°C to 85°C in a 20-SSOP (0.154", 3.90mm Width) package.

The PI49FCT3807CQ is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and legacy system support.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Part Number	PI49FCT3807CQ
Type	Fanout Buffer (Distribution)
Ratio - Input:Output	1:10
Frequency - Max	100 MHz
Input Logic	CMOS, TTL
Output Logic	CMOS, TTL
Voltage - Supply	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SSOP (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the PI49FCT3807CQ is determined by the following critical parameters:

Primary Substitution Criteria:

Ratio - Input:Output: 1:10 (mandatory match)
Package / Case: 20-SSOP form factor (physical compatibility)
Frequency - Max: 100 MHz or higher (functional compatibility)
Voltage - Supply: 3V ~ 3.6V range (electrical compatibility)
Operating Temperature: -40°C ~ 85°C or compatible range
Input/Output Logic: CMOS/TTL or LVTTL (signal compatibility)

Direct Equivalent: PI49FCT3807CQE (Diodes Incorporated) is the active production equivalent with identical electrical specifications and RoHS3 compliance.

Manufacturer Recommended Substitutes: Renesas Electronics Corporation 74FCT series parts provide functional equivalence with enhanced specifications. The 74FCT3807 variants maintain the 1:10 ratio, 100 MHz frequency, and compatible package options. The 74FCT20807 variants offer higher frequency capability (166 MHz) with different supply voltage requirements (2.3V ~ 2.7V LVTTL).

Parameter Comparison

Part Number	Manufacturer	Type	Ratio	Frequency (MHz)	Supply Voltage	Input Logic	Output Logic	Temp Range (°C)	Package	Product Status	RoHS Status
PI49FCT3807CQ	Diodes Inc.	Fanout Buffer	1:10	100	3V ~ 3.6V	CMOS, TTL	CMOS, TTL	-40 ~ 85	20-SSOP (0.154")	Obsolete	Non-compliant
PI49FCT3807CQE	Diodes Inc.	Fanout Buffer	1:10	100	3V ~ 3.6V	CMOS, TTL	CMOS, TTL	-40 ~ 85	20-SSOP (0.154")	Active	ROHS3 Compliant
74FCT3807APYG	Renesas	Fanout Buffer	1:10	100	3V ~ 3.6V	LVTTL	CMOS, TTL	0 ~ 70	20-SSOP (0.209")	Active	ROHS3 Compliant
74FCT3807APYG8	Renesas	Fanout Buffer	1:10	100	3V ~ 3.6V	LVTTL	CMOS, TTL	0 ~ 70	20-SSOP (0.209")	Active	ROHS3 Compliant
74FCT3807APYGI	Renesas	Fanout Buffer	1:10	100	3V ~ 3.6V	LVTTL	CMOS, TTL	-40 ~ 85	20-SSOP (0.209")	Active	ROHS3 Compliant
74FCT3807APYGI8	Renesas	Fanout Buffer	1:10	100	3V ~ 3.6V	LVTTL	CMOS, TTL	-40 ~ 85	20-SSOP (0.209")	Active	ROHS3 Compliant
74FCT3807AQG	Renesas	Fanout Buffer	1:10	100	3V ~ 3.6V	LVTTL	CMOS, TTL	0 ~ 70	20-SSOP (0.154")	Active	ROHS3 Compliant
74FCT3807AQG8	Renesas	Fanout Buffer	1:10	100	3V ~ 3.6V	LVTTL	CMOS, TTL	0 ~ 70	20-SSOP (0.154")	Active	ROHS3 Compliant
74FCT3807AQGI	Renesas	Fanout Buffer	1:10	100	3V ~ 3.6V	LVTTL	CMOS, TTL	-40 ~ 85	20-SSOP (0.154")	Active	ROHS3 Compliant
74FCT20807QGI	Renesas	Fanout Buffer	1:10	166	2.3V ~ 2.7V	LVTTL	LVTTL	-40 ~ 85	20-SSOP (0.154")	Active	ROHS3 Compliant
74FCT20807QGI8	Renesas	Fanout Buffer	1:10	166	2.3V ~ 2.7V	LVTTL	LVTTL	-40 ~ 85	20-SSOP (0.154")	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Replacement: PI49FCT3807CQE is the recommended primary substitute. It maintains identical electrical specifications and package form factor as the obsolete PI49FCT3807CQ while offering active product status and RoHS3 compliance. This part requires no design modifications.

Tier 2 - Compatible Substitutes (Package Variant): 74FCT3807AQGI and 74FCT3807AQG8 (Renesas) provide functional equivalence with the original part's 20-SSOP (0.154", 3.90mm Width) package. Both maintain 1:10 ratio, 100 MHz frequency, and 3V ~ 3.6V supply voltage. The AQGI variant supports the full -40°C ~ 85°C temperature range matching the original specification. Both are RoHS3 compliant and in active production.

Tier 3 - Compatible Substitutes (Wider Package): 74FCT3807APYGI and 74FCT3807APYGI8 (Renesas) offer functional equivalence with a wider 20-SSOP package (0.209", 5.30mm Width). These parts maintain identical electrical specifications and support the full -40°C ~ 85°C temperature range. PCB layout modifications are required due to package width difference.

Tier 4 - Higher Performance Alternative: 74FCT20807QGI and 74FCT20807QGI8 (Renesas) provide enhanced frequency capability at 166 MHz. These parts operate at reduced supply voltage (2.3V ~ 2.7V LVTTL) and are suitable only for applications where voltage compatibility is confirmed. These represent a performance upgrade rather than a direct replacement.

All recommended substitutes are RoHS3 compliant and in active production status, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can PI49FCT3807CQE be used as a direct drop-in replacement for PI49FCT3807CQ? A: Yes. PI49FCT3807CQE is the active production equivalent with identical electrical specifications, package form factor, and pin configuration. No design modifications are required.

Q: What is the difference between the 74FCT3807 variants from Renesas? A: The variants differ in packaging format and temperature range. The AQG/AQG8 variants use the narrower 20-SSOP (0.154", 3.90mm Width) package matching the original PI49FCT3807CQ. The APYG/APYG8 variants use a wider 20-SSOP (0.209", 5.30mm Width) package. The "I" suffix indicates -40°C ~ 85°C temperature range; without "I" indicates 0°C ~ 70°C range. The "8" suffix indicates Tape & Reel packaging; without "8" indicates Tube packaging.

Q: Are the 74FCT20807 parts suitable replacements? A: The 74FCT20807 series maintains the 1:10 ratio and 20-SSOP package but operates at different supply voltage (2.3V ~ 2.7V) and higher frequency (166 MHz). These are suitable only if your application supports LVTTL logic levels and the reduced supply voltage range. They represent a performance upgrade, not a direct replacement.

Q: What packaging options are available? A: Substitute parts are available in Tube, Tape & Reel (TR), and Cut Tape (CT) & Digi-Reel packaging formats. The package width varies between 0.154" (3.90mm) and 0.209" (5.30mm) depending on the specific variant. Verify PCB footprint compatibility before selection.

Q: Are all substitute parts RoHS compliant? A: Yes. All recommended substitute parts are RoHS3 compliant. The original PI49FCT3807CQ is RoHS non-compliant. If RoHS compliance is required for your application, substitute parts must be used.

Q: What is the inventory status of these parts? A: PI49FCT3807CQE has 3,204 units in stock. Renesas 74FCT3807 variants have between 1,700 and 21,374 units available. The 74FCT20807 variants have 661 and 765 units respectively. Verify current availability with your supplier before finalizing procurement.

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