CD74FCT244SM96E4 Equivalent & Substitute Parts

Part Overview

The CD74FCT244SM96E4 is a non-inverting buffer logic IC manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability in a 20-SSOP package. This part operates within a 4.75V to 5.25V supply voltage range and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD74FCT244SM96E4
Manufacturer	Texas Instruments
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	0°C ~ 70°C (TA)
Package / Case	20-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the CD74FCT244SM96E4 are grouped based on the following critical parameters that determine functional compatibility:

Core Functional Parameters:

Logic Type: Buffer, Non-Inverting
Number of Elements: 2
Number of Bits per Element: 4
Output Type: 3-State
Package / Case: 20-SSOP form factor
Mounting Type: Surface Mount

Electrical Compatibility Parameters:

Voltage - Supply range overlap or compatibility
Current - Output High, Low specifications
Operating Temperature range

The substitute parts maintain the same functional architecture (2-element, 4-bit non-inverting buffer with 3-state output) and package footprint, ensuring direct replacement capability in applications where the original part is no longer available.

Parameter Comparison

Parameter	CD74FCT244SM96E4	SN74HCT244DBR	74FCT244ATQG	74FCT244CTQG
Manufacturer	Texas Instruments	Texas Instruments	IDT	IDT
Series	74FCT	74HCT	74FCT	74FCT
Logic Type	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting
Number of Elements	2	2	2	2
Number of Bits per Element	4	4	4	4
Output Type	3-State	3-State	3-State	3-State
Current - Output High, Low	15mA, 64mA	6mA, 6mA	15mA, 64mA	15mA, 64mA
Voltage - Supply	4.75V ~ 5.25V	4.5V ~ 5.5V	4.75V ~ 5.25V	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SSOP (0.209", 5.30mm Width)	20-SSOP (0.209", 5.30mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	Not specified

Engineering Selection Recommendations

SN74HCT244DBR (Texas Instruments): This part is an active product from Texas Instruments with ROHS3 compliance and extended operating temperature range (-40°C to 85°C). The supply voltage range (4.5V ~ 5.5V) encompasses the original part's range. Output current specifications differ (6mA vs. 15mA/64mA), requiring verification of circuit current requirements. This option maintains manufacturer continuity and active product support.

74FCT244ATQG (IDT): This active product maintains identical electrical specifications (15mA, 64mA output current and 4.75V ~ 5.25V supply voltage) and extended operating temperature range (-40°C to 85°C). The package width differs (0.154" vs. 0.209"), which may require PCB layout adjustment. This part provides the closest electrical match to the original.

74FCT244CTQG (IDT): This active product offers identical electrical specifications to 74FCT244ATQG with the same package width consideration. Extended operating temperature range (-40°C to 85°C) and active product status support long-term availability.

Frequently Asked Questions (FAQ)

Q: Can SN74HCT244DBR directly replace CD74FCT244SM96E4 in all applications?

A: SN74HCT244DBR maintains functional compatibility as a non-inverting buffer with 2 elements, 4 bits per element, and 3-state output in the same 20-SSOP package footprint. However, the output current specifications differ (6mA vs. 15mA/64mA). Applications requiring the higher output current of the original part must be evaluated for compatibility with the reduced current capability.

Q: What is the primary difference between the IDT 74FCT244ATQG and 74FCT244CTQG?

A: Both parts are functionally and electrically identical. The primary distinction is inventory availability and packaging format (Bulk). Selection between these parts should be based on procurement requirements and stock levels.

Q: Are there package footprint differences between substitute parts?

A: Yes. The original CD74FCT244SM96E4 and SN74HCT244DBR use a 20-SSOP package with 0.209" width. The IDT parts (74FCT244ATQG and 74FCT244CTQG) use a 20-SSOP package with 0.154" width. This dimensional difference may require PCB layout modifications for the IDT alternatives.

Q: Which substitute part offers the best long-term availability?

A: SN74HCT244DBR, 74FCT244ATQG, and 74FCT244CTQG are all active products. Texas Instruments (SN74HCT244DBR) and IDT (74FCT244ATQG and 74FCT244CTQG) both maintain active product lines for these buffer ICs, supporting ongoing procurement.

Q: How do operating temperature ranges affect part selection?

A: The original CD74FCT244SM96E4 operates from 0°C to 70°C. All substitute parts extend this range to -40°C to 85°C (SN74HCT244DBR) or -40°C to 85°C (IDT parts), providing broader environmental compatibility for applications requiring extended temperature operation.

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