PI74FCT244ATQ Equivalent & Substitute Parts

Part Overview

The PI74FCT244ATQ is a non-inverting buffer logic IC manufactured by Diodes Incorporated, featuring 2 elements with 4 bits per element and 3-state output capability. This component operates within the 4.75V to 5.25V supply voltage range and is housed in a 20-QSOP package. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI74FCT244ATQ
Manufacturer	Diodes Incorporated
Logic Type	Buffer, Non-Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Current - Output High, Low	15mA, 64mA
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SSOP (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the PI74FCT244ATQ is determined by strict electrical and mechanical compatibility across the following parameters:

Critical Matching Parameters:

Logic Type: Buffer, Non-Inverting
Number of Elements: 2
Number of Bits per Element: 4
Output Type: 3-State
Voltage - Supply: 4.75V ~ 5.25V
Operating Temperature: -40°C ~ 85°C (TA)
Package / Case: 20-SSOP (0.154", 3.90mm Width)

Allowable Variation Parameters:

Current - Output High, Low: Substitutes with equal or higher current ratings are acceptable
Product Status: Active substitutes are preferred over obsolete parts
RoHS Compliance: ROHS3 compliant substitutes are preferred for new designs
Packaging Format: Bulk, Cut Tape (CT), or Tape & Reel (TR) formats are interchangeable

Substitutes are grouped into three categories: Direct Manufacturer equivalents, MFR Recommended alternatives, and Parametric Equivalents, all meeting the core electrical and mechanical requirements.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	I(OH)/I(OL) mA	Supply Voltage	Temp Range	Package	Status	RoHS
PI74FCT244ATQ	Diodes Inc.	Buffer, Non-Inverting	2	4	3-State	15/64	4.75-5.25V	-40 to 85°C	20-QSOP	Obsolete	Non-compliant
74FCT244CTQG	IDT	Buffer, Non-Inverting	2	4	3-State	15/64	4.75-5.25V	-40 to 85°C	20-QSOP	Active	Not specified
74FCT244ATQG	IDT	Buffer, Non-Inverting	2	4	3-State	15/64	4.75-5.25V	-40 to 85°C	20-QSOP	Active	Not specified
CY74FCT2244ATQCT	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15/12	4.75-5.25V	-40 to 85°C	20-SSOP	Active	ROHS3 Compliant
CY74FCT2244CTQCT	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15/12	4.75-5.25V	-40 to 85°C	20-SSOP	Active	ROHS3 Compliant
CY74FCT2244TQCT	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15/12	4.75-5.25V	-40 to 85°C	20-SSOP	Active	ROHS3 Compliant
CY74FCT244ATQCT	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	32/64	4.75-5.25V	-40 to 85°C	20-SSOP	Active	ROHS3 Compliant
CY74FCT244CTQCT	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	32/64	4.75-5.25V	-40 to 85°C	20-SSOP	Active	ROHS3 Compliant
CY74FCT244TQCT	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	32/64	4.75-5.25V	-40 to 85°C	20-SSOP	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Obsolescence Mitigation: The PI74FCT244ATQ is classified as obsolete. Direct substitution is recommended using active-status equivalents from IDT (74FCT244CTQG or 74FCT244ATQG) which maintain identical electrical specifications and package format.

For New Designs and RoHS Compliance: Texas Instruments CY74FCT244 and CY74FCT2244 series parts are recommended as they provide ROHS3 compliance and active product status. These parts are available in multiple packaging formats (Cut Tape and Tape & Reel) to accommodate various procurement requirements.

Current Rating Considerations: Substitutes with higher output current ratings (32mA/64mA versus 15mA/64mA) provide enhanced drive capability and are electrically compatible. Substitutes with lower output current ratings (15mA/12mA) are suitable only where the original 64mA low-side current is not required by the application.

Packaging Format Selection: All substitute parts maintain the 20-SSOP package footprint. Selection between Bulk, Cut Tape, and Tape & Reel formats depends on procurement volume and assembly process requirements.

Frequently Asked Questions (FAQ)

Q: Can I directly replace PI74FCT244ATQ with 74FCT244CTQG? A: Yes. The 74FCT244CTQG from IDT is a direct equivalent with identical logic type, element count, bit configuration, output type, supply voltage range, operating temperature, and package format. The primary advantage is active product status versus the obsolete PI74FCT244ATQ.

Q: What is the difference between CY74FCT244 and CY74FCT2244 series? A: Both series are functionally equivalent non-inverting buffers with 2 elements and 4 bits per element. The CY74FCT2244 variants are MFR recommended alternatives with ROHS3 compliance. Selection depends on design requirements and compliance mandates.

Q: Are Texas Instruments CY74FCT244 parts compatible with the original PI74FCT244ATQ? A: Yes, with output current considerations. CY74FCT244ATQCT and CY74FCT244CTQCT variants provide 32mA/64mA output current (higher than the original 15mA/64mA), ensuring full compatibility with enhanced drive capability. CY74FCT2244 variants provide 15mA/12mA output current and are suitable where lower output current is acceptable.

Q: What packaging formats are available for substitutes? A: Substitute parts are available in Bulk, Cut Tape (CT), and Tape & Reel (TR) formats. All maintain the 20-SSOP package footprint compatible with the original PI74FCT244ATQ PCB layout.

Q: Should I prioritize RoHS compliance when selecting a substitute? A: For new designs, ROHS3 compliant parts (Texas Instruments CY74FCT244 and CY74FCT2244 series) are recommended. For legacy system maintenance, non-compliant IDT equivalents remain functionally compatible.

Q: What is the inventory status of these substitutes? A: All listed substitutes maintain active inventory. IDT 74FCT244 variants range from 2,347 to 8,549 units. Texas Instruments CY74FCT244 and CY74FCT2244 variants range from 1,245 to 4,089 units in stock.

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