SN74AC244MNSREP Equivalent & Substitute Parts

Part Overview

The SN74AC244MNSREP is a Buffer, Non-Inverting logic IC manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability. This component operates across a 2V to 6V supply voltage range and is designed for surface mount applications in the 20-SO package. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating.

Equivalent and substitute parts are necessary when the primary part is unavailable, when alternative packaging formats are required for manufacturing processes, or when sourcing from different manufacturers is preferred for supply chain optimization.

Key Parameters

Parameter	Value
Logic Type	Buffer, Non-Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Current - Output High, Low	24mA, 24mA
Voltage - Supply	2V ~ 6V
Mounting Type	Surface Mount
Series	74AC
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the SN74AC244MNSREP is determined by the following critical parameters:

Logic Type: Buffer, Non-Inverting
Number of Elements: 2
Number of Bits per Element: 4
Output Type: 3-State
Current - Output High, Low: 24mA, 24mA
Voltage - Supply: 2V ~ 6V
Series: 74AC
Mounting Type: Surface Mount
Product Status: Active

All identified substitute parts maintain these core electrical and functional specifications. Variations in package dimensions, operating temperature ranges, and packaging formats (Tape & Reel, Cut Tape, Tube) do not affect functional substitutability when the above parameters are identical.

Parameter Comparison

Parameter	SN74AC244MNSREP (TI)	74AC244SC (Fairchild)	74AC244SCX (onsemi)	MC74AC244DWG (onsemi)
Manufacturer	Texas Instruments	Fairchild Semiconductor	onsemi	onsemi
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	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Series	74AC	74AC	74AC	74AC
Product Status	Active	Active	Active	Active
Operating Temperature	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SOIC (0.209", 5.30mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	Not specified	3 (168 Hours)	3 (168 Hours)
Packaging Format	Tape & Reel (TR)	Not specified	Cut Tape (CT) & Digi-Reel®	Tube

Engineering Selection Recommendations

All substitute parts maintain active product status and are functionally equivalent to the SN74AC244MNSREP based on identical core electrical specifications. Selection among substitutes should be based on the following factors:

RoHS Compliance: The 74AC244SCX and MC74AC244DWG are ROHS3 compliant, matching the primary part. The 74AC244SC compliance status is not specified in available data.

Moisture Sensitivity: The SN74AC244MNSREP carries MSL 1 (Unlimited), providing superior moisture tolerance. The 74AC244SCX and MC74AC244DWG both carry MSL 3 (168 Hours), requiring controlled storage and handling conditions.

Operating Temperature Range: The SN74AC244MNSREP supports -55°C to 125°C, providing extended low-temperature operation. All substitute parts operate within -40°C to 85°C, which is suitable for standard industrial and commercial applications.

Package Dimensions: The SN74AC244MNSREP uses a narrower 20-SOIC package (0.209", 5.30mm width), while all substitutes use the standard 20-SOIC package (0.295", 7.50mm width). PCB layout compatibility must be verified before substitution.

Packaging Format: Substitutes are available in Cut Tape, Tube, and alternative reel formats, providing flexibility for different assembly and procurement workflows.

Frequently Asked Questions (FAQ)

Q: Can the 74AC244SC, 74AC244SCX, and MC74AC244DWG be used interchangeably with the SN74AC244MNSREP?

A: Yes, all three substitute parts are functionally equivalent based on identical logic type, element count, bit configuration, output type, current ratings, and supply voltage specifications. However, physical package dimensions differ, requiring PCB layout verification.

Q: What is the significance of the different package widths (0.209" vs 0.295")?

A: The SN74AC244MNSREP uses a narrower 20-SOIC package, while substitutes use the standard 20-SOIC package. This affects PCB footprint spacing and component placement. Designs must accommodate the wider footprint of substitute parts or confirm that existing layouts support both dimensions.

Q: Does the operating temperature difference affect substitutability?

A: The SN74AC244MNSREP operates from -55°C to 125°C, while substitutes operate from -40°C to 85°C. For applications requiring extended low-temperature operation below -40°C or high-temperature operation above 85°C, the primary part is required. For standard industrial and commercial temperature ranges, substitutes are suitable.

Q: What is the impact of different Moisture Sensitivity Levels?

A: The SN74AC244MNSREP carries MSL 1 (Unlimited), allowing indefinite storage without moisture control. Substitutes with MSL 3 (168 Hours) require controlled storage conditions and must be used within 168 hours of package opening if not stored in a dry environment. This affects supply chain handling and inventory management.

Q: Are all substitute parts ROHS3 compliant?

A: The 74AC244SCX and MC74AC244DWG are confirmed ROHS3 compliant. The 74AC244SC compliance status is not specified in available documentation and should be verified with the manufacturer before use in applications requiring RoHS certification.

Q: Which substitute part offers the best availability?

A: The 74AC244SCX from onsemi has the highest inventory level at 18,995 pieces. The 74AC244SC from Fairchild has 1,415 pieces, and the MC74AC244DWG from onsemi has 2,060 pieces available.

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