74FCT244CTQG Equivalent & Substitute Parts

Part Overview

The 74FCT244CTQG is a non-inverting buffer logic IC manufactured by Renesas Electronics Corporation, designed for 5V CMOS applications. This device features 2 elements with 4 bits per element and 3-state output capability, housed in a 20-QSOP surface mount package. The part is classified as Last Time Buy, indicating end-of-life status from the original manufacturer. Equivalent and substitute parts are necessary to ensure continued design support, maintain supply chain flexibility, and access active production alternatives from other manufacturers.

Key Parameters

Parameter	Specification
Logic Type	Buffer, Non-Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Voltage Supply Range	4.75V ~ 5.25V
Operating Temperature Range	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	20-SSOP (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74FCT244CTQG is determined by strict equivalence across the following critical parameters:

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

Substitute parts are grouped into two categories:

Parametric Equivalent: 74FCT244ATQG (IDT) maintains identical electrical and mechanical specifications with active product status and bulk packaging.

Manufacturer Recommended Alternatives: Texas Instruments CY74FCT series parts (CY74FCT2244ATQCT, CY74FCT2244CTQCT, CY74FCT2244TQCT, CY74FCT244ATQCT, CY74FCT244CTQCT, CY74FCT244TQCT) provide functional equivalence with variations in output current ratings and packaging formats (Cut Tape, Tape & Reel).

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements / Bits	Output Type	Voltage Supply	Temp Range	Package	Product Status	Inventory
74FCT244CTQG	Renesas Electronics	Buffer, Non-Inverting	2 / 4	3-State	4.75V ~ 5.25V	-40°C ~ 85°C	20-QSOP	Last Time Buy	1462 Pcs
74FCT244ATQG	IDT	Buffer, Non-Inverting	2 / 4	3-State	4.75V ~ 5.25V	-40°C ~ 85°C	20-QSOP	Active	2347 Pcs
CY74FCT2244ATQCT	Texas Instruments	Buffer, Non-Inverting	2 / 4	3-State	4.75V ~ 5.25V	-40°C ~ 85°C	20-SSOP	Active	4977 Pcs
CY74FCT2244CTQCT	Texas Instruments	Buffer, Non-Inverting	2 / 4	3-State	4.75V ~ 5.25V	-40°C ~ 85°C	20-SSOP	Active	1245 Pcs
CY74FCT2244TQCT	Texas Instruments	Buffer, Non-Inverting	2 / 4	3-State	4.75V ~ 5.25V	-40°C ~ 85°C	20-SSOP	Active	3137 Pcs
CY74FCT244ATQCT	Texas Instruments	Buffer, Non-Inverting	2 / 4	3-State	4.75V ~ 5.25V	-40°C ~ 85°C	20-SSOP	Active	2014 Pcs
CY74FCT244CTQCT	Texas Instruments	Buffer, Non-Inverting	2 / 4	3-State	4.75V ~ 5.25V	-40°C ~ 85°C	20-SSOP	Active	4089 Pcs
CY74FCT244TQCT	Texas Instruments	Buffer, Non-Inverting	2 / 4	3-State	4.75V ~ 5.25V	-40°C ~ 85°C	20-SSOP	Active	1842 Pcs

Engineering Selection Recommendations

The 74FCT244CTQG is Last Time Buy status, making substitution necessary for new designs and ongoing production support.

Primary Recommendation: 74FCT244ATQG (IDT) is the direct parametric equivalent with identical electrical specifications and active product status. This part maintains the original 20-QSOP package format and provides the highest compatibility assurance.

Secondary Recommendations: Texas Instruments CY74FCT series parts (CY74FCT244CTQCT, CY74FCT244ATQCT, CY74FCT244TQCT) are functionally equivalent with active production status and ROHS3 compliance. These parts are available in multiple packaging formats (Cut Tape and Tape & Reel) to accommodate different procurement workflows. Output current specifications vary across the CY74FCT244 variants; verify current requirements against your application before selection.

Texas Instruments CY74FCT2244 series parts (CY74FCT2244ATQCT, CY74FCT2244CTQCT, CY74FCT2244TQCT) maintain functional equivalence with base product number differentiation. These parts carry MSL Level 2 (1 Year) moisture sensitivity versus the original MSL Level 1, requiring appropriate handling protocols during storage and assembly.

All recommended substitutes are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74FCT244CTQG with 74FCT244ATQG?

A: Yes. The 74FCT244ATQG is a parametric equivalent with identical logic type, element configuration, output type, voltage supply range, operating temperature, and package specifications. Both use 20-QSOP packaging and maintain 3-state output functionality.

Q: What is the difference between 74FCT244 and CY74FCT2244 variants?

A: The base product numbers differ (74FCT244 versus CY74FCT2244), but both maintain identical functional specifications for this application: 2 elements, 4 bits per element, 3-state output, and 20-SSOP packaging. The CY74FCT2244 variants are Texas Instruments manufactured alternatives with active production status.

Q: Are there output current differences between substitute parts?

A: Yes. The original 74FCT244CTQG specifies 15mA output high and 64mA output low. IDT 74FCT244ATQG matches these specifications. Texas Instruments CY74FCT2244 series parts specify 15mA output high and 12mA output low. Texas Instruments CY74FCT244 series parts specify either 15mA/64mA or 32mA/64mA depending on variant. Verify your application's current requirements before selection.

Q: What packaging options are available for substitutes?

A: The 74FCT244ATQG is available in bulk packaging. Texas Instruments CY74FCT series parts are available in Cut Tape (CT) and Tape & Reel (TR) formats to support different assembly and procurement workflows.

Q: Do substitute parts have different moisture sensitivity levels?

A: Yes. The original 74FCT244CTQG has MSL Level 1 (Unlimited). IDT 74FCT244ATQG specifications do not specify MSL. Texas Instruments CY74FCT series parts have MSL Level 2 (1 Year), requiring controlled storage conditions and shorter shelf life management during manufacturing.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts carry ROHS3 compliance certification and are REACH unaffected, meeting current environmental and regulatory standards.

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