74ACQ244SCX Equivalent & Substitute Parts

Part Overview

The 74ACQ244SCX is a Buffer, Non-Inverting logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability in a 20-SOIC package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74ACQ244SCX operates across a 2V to 6V supply voltage range with output current capability of 24mA for both high and low states, suitable for general-purpose buffering applications in digital logic circuits.

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
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 74ACQ244SCX is determined by strict equivalence across the following critical parameters: logic type (Buffer, Non-Inverting), number of elements (2), bits per element (4), output type (3-State), output current capability (24mA minimum for both high and low states), supply voltage range (minimum 2V to 6V), package type (20-SOIC with 0.295" width), and mounting type (Surface Mount).

Substitute parts are grouped into the following categories:

Parametric Equivalents (Active Status): Parts meeting all electrical and mechanical specifications with active product status, including 74AC244SCX and MC74AC244DWR2G from onsemi and Texas Instruments respectively.

Direct Substitutes (Discontinued Status): Parts with identical specifications but discontinued availability, such as SN74AC244DW from Texas Instruments.

Similar Parts (Voltage Variation): Parts meeting all specifications except supply voltage range, such as CD74AC244M and CD74AC244M96, which operate at 1.5V to 5.5V instead of 2V to 6V.

Package Variants (Different Case Dimensions): Parts with identical electrical specifications but different package dimensions, such as SN74AC244MNSREP and SN74AC244NSR in 20-SO (0.209" width) instead of 20-SOIC (0.295" width).

Upgrade Options (Extended Temperature Range): Parts with identical core specifications but extended operating temperature range (-55°C to 125°C), such as SN74AC244MDWREP.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	Status
74ACQ244SCX	onsemi	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (0.295")	Obsolete
MC74AC244DWG	onsemi	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (0.295")	Active
74AC244SCX	onsemi	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (0.295")	Active
MC74AC244DWR2G	onsemi	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (0.295")	Active
SN74AC244DW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (0.295")	Discontinued
SN74AC244MDWREP	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-55°C ~ 125°C	20-SOIC (0.295")	Active
CD74AC244M	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	1.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (0.295")	Discontinued
CD74AC244M96	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	1.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (0.295")	Active
SN74AC244MNSREP	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-55°C ~ 125°C	20-SO (0.209")	Active
SN74AC244NSR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SO (0.209")	Active
SN74AC241DWR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (0.295")	Active

Engineering Selection Recommendations

For direct replacement of the obsolete 74ACQ244SCX with identical electrical and mechanical specifications, select from active-status parametric equivalents: MC74AC244DWG, 74AC244SCX, or MC74AC244DWR2G from onsemi. These parts maintain full compatibility with existing PCB layouts and design requirements.

For applications requiring extended operating temperature range (-55°C to 125°C), SN74AC244MDWREP from Texas Instruments provides upgrade capability while maintaining all other electrical specifications and the 20-SOIC package format.

For applications where supply voltage range can be constrained to 1.5V to 5.5V, CD74AC244M96 from Texas Instruments offers active product status with identical functional and package specifications.

For applications where package footprint can accommodate a narrower 20-SO case (0.209" width instead of 0.295"), SN74AC244NSR or SN74AC244MNSREP provide active alternatives with identical electrical performance.

All recommended substitutes carry ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the original part.

Frequently Asked Questions (FAQ)

Q: Can I use CD74AC244M96 as a direct replacement for 74ACQ244SCX?

A: CD74AC244M96 is functionally equivalent in logic type, element count, bit width, output type, and output current. However, the supply voltage range differs: CD74AC244M96 operates at 1.5V to 5.5V, while 74ACQ244SCX operates at 2V to 6V. If your design operates exclusively within the 1.5V to 5.5V range, CD74AC244M96 is compatible. If your design requires operation above 5.5V or below 2V, this part is not suitable.

Q: What is the difference between MC74AC244DWG and MC74AC244DWR2G?

A: Both parts are parametric equivalents with identical electrical specifications and 20-SOIC package dimensions. The primary difference is packaging format: MC74AC244DWG is supplied in Tube packaging, while MC74AC244DWR2G is supplied in Cut Tape (CT) & Digi-Reel format. Selection depends on procurement and assembly requirements.

Q: Can I use SN74AC244MNSREP in place of 74ACQ244SCX on the same PCB?

A: SN74AC244MNSREP has identical electrical specifications and extended temperature range (-55°C to 125°C). However, the package case differs: SN74AC244MNSREP uses 20-SO with 0.209" width, while 74ACQ244SCX uses 20-SOIC with 0.295" width. These packages have different footprints and are not interchangeable on the same PCB without layout modification.

Q: Is SN74AC244DW still available for new designs?

A: SN74AC244DW is discontinued at DiGi Electronics and carries discontinued product status. For new designs, select from active-status alternatives such as MC74AC244DWG, 74AC244SCX, or MC74AC244DWR2G.

Q: What advantage does SN74AC244MDWREP offer over the standard 74ACQ244SCX?

A: SN74AC244MDWREP extends the operating temperature range to -55°C to 125°C compared to the standard -40°C to 85°C range of 74ACQ244SCX. All other electrical specifications and the 20-SOIC package remain identical. This upgrade is beneficial for applications requiring operation in extreme temperature environments.

Q: Are all substitute parts RoHS compliant?

A: All active-status substitute parts listed carry ROHS3 compliance certification. The original 74ACQ244SCX does not specify RoHS status in the provided data. Verify RoHS requirements for your specific application before final part selection.

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