PI74FCT244ATQE Equivalent & Substitute Parts

Part Overview

The PI74FCT244ATQE is a non-inverting buffer logic IC manufactured by Diodes Incorporated, designed for 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 identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI74FCT244ATQE
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)
Mounting Type	Surface Mount
Package / Case	20-SSOP (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the PI74FCT244ATQE are classified into two categories based on electrical and mechanical compatibility:

MFR Recommended Substitutes (Texas Instruments CY74FCT Series): These parts maintain full functional equivalence with the original PI74FCT244ATQE across all critical parameters: 2 elements, 4 bits per element, 3-state output, 4.75V to 5.25V supply voltage, -40°C to 85°C operating temperature range, and identical 20-SSOP package dimensions. The key differentiator is output current capability and product status. Parts designated CY74FCT244ATQCT and CY74FCT244CTQCT match the original 15mA/64mA output current specification, while CY74FCT244TQCT, CY74FCT2244ATQCT, CY74FCT2244CTQCT, and CY74FCT2244TQCT provide 32mA/64mA output current. All Texas Instruments variants are active products with ROHS3 compliance and MSL rating of 2 (1 Year).

Parametric Equivalents (IDT 74FCT244 Series): The 74FCT244ATQG and 74FCT244CTQG from Integrated Device Technology Inc provide parametric equivalence with matching output current (15mA/64mA), supply voltage, temperature range, and functional specifications. These parts are supplied in bulk packaging and maintain active product status.

Parameter Comparison

Parameter	PI74FCT244ATQE (Original)	CY74FCT244ATQCT	CY74FCT244CTQCT	CY74FCT244TQCT	CY74FCT2244ATQCT	CY74FCT2244CTQCT	CY74FCT2244TQCT	74FCT244ATQG	74FCT244CTQG
Manufacturer	Diodes Inc	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	IDT	IDT
Logic Type	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting
Number of Elements	2	2	2	2	2	2	2	2	2
Number of Bits per Element	4	4	4	4	4	4	4	4	4
Output Type	3-State	3-State	3-State	3-State	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	15mA, 64mA	32mA, 64mA	15mA, 12mA	32mA, 64mA	15mA, 12mA	15mA, 12mA	15mA, 12mA	15mA, 64mA	15mA, 64mA
Voltage - Supply	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	Not specified
MSL Rating	1 (Unlimited)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)	Not specified	Not specified

Engineering Selection Recommendations

For applications requiring direct replacement of the PI74FCT244ATQE, the Texas Instruments CY74FCT244ATQCT and CY74FCT244CTQCT are the primary selections. These parts maintain exact output current specifications (15mA high, 64mA low) matching the original component while offering active product status and full ROHS3 compliance. The MSL rating of 2 (1 Year) is suitable for standard manufacturing environments.

When output current specifications can accommodate higher sourcing capability, the CY74FCT244TQCT, CY74FCT2244ATQCT, CY74FCT2244CTQCT, and CY74FCT2244TQCT variants provide additional inventory availability while maintaining all other electrical and mechanical parameters. These parts are available in tape and reel packaging configurations.

The IDT 74FCT244ATQG and 74FCT244CTQG provide parametric equivalence with matching output current and functional specifications. These parts are supplied in bulk packaging and maintain active product status, though RoHS and MSL certifications are not specified in available documentation.

All recommended substitutes share identical package dimensions (20-SSOP, 0.154" width, 3.90mm), supply voltage range (4.75V to 5.25V), operating temperature range (-40°C to 85°C), and functional architecture (2 elements, 4 bits per element, 3-state output).

Frequently Asked Questions (FAQ)

Q: Can the CY74FCT244ATQCT directly replace the PI74FCT244ATQE in existing designs?

A: Yes. The CY74FCT244ATQCT maintains identical output current specifications (15mA/64mA), supply voltage range (4.75V to 5.25V), operating temperature range (-40°C to 85°C), package dimensions (20-SSOP), and functional architecture (2 elements, 4 bits per element, 3-state output). No circuit modifications are required.

Q: What is the difference between the CY74FCT244 and CY74FCT2244 series?

A: Both series provide identical functional specifications and electrical parameters for this application. The primary difference is base product number designation. Both are suitable substitutes for the PI74FCT244ATQE.

Q: Are there output current differences between substitute options?

A: Yes. The CY74FCT244ATQCT and CY74FCT244CTQCT provide 15mA/64mA output current, matching the original PI74FCT244ATQE. The CY74FCT244TQCT, CY74FCT2244ATQCT, CY74FCT2244CTQCT, and CY74FCT2244TQCT provide 32mA/64mA output current. The 74FCT244ATQG and 74FCT244CTQG from IDT provide 15mA/64mA output current. Selection depends on circuit load requirements.

Q: What packaging options are available?

A: Texas Instruments CY74FCT variants are available in Cut Tape (CT) and Tape & Reel (TR) configurations. IDT 74FCT244 parts are supplied in bulk packaging. All maintain the same 20-SSOP package footprint.

Q: Is the MSL rating difference between the original and substitutes significant?

A: The original PI74FCT244ATQE has MSL 1 (Unlimited), while Texas Instruments substitutes have MSL 2 (1 Year). MSL 2 requires storage in controlled humidity conditions for one year from the date of manufacture. For standard manufacturing environments with proper moisture control, this difference does not impact functionality.

Q: Are all substitutes ROHS3 compliant?

A: Texas Instruments CY74FCT variants are explicitly ROHS3 compliant. IDT 74FCT244 parts do not specify RoHS compliance in available documentation. Verify compliance requirements with your procurement specifications.

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