74ACQ241SC Equivalent & Substitute Parts

Part Overview

The 74ACQ241SC is a non-inverting buffer logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The 74ACQ241SC operates across a 2V to 6V supply voltage range with 24mA output current capability in both high and low states, housed in a 20-SOIC surface mount package.

Key Parameters

Parameter	Specification
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)
Mounting Type	Surface Mount
Package / Case	20-SOIC (0.295", 7.50mm Width)

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACQ241SC is determined by matching 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, 24mA), supply voltage range (2V ~ 6V), operating temperature range (-40°C ~ 85°C), and mounting type (Surface Mount).

Substitute parts are grouped into three categories based on their relationship to the main part:

Parametric Equivalents share identical electrical and mechanical specifications with the 74ACQ241SC, differing only in manufacturer or product status. These parts are direct functional replacements.

Direct Manufacturer Parts are alternative part numbers from the same or different manufacturers that meet all electrical specifications and use the same package footprint (20-SOIC, 0.295" width).

Similar Parts meet all electrical specifications but may have minor package variations (such as 20-SO with 0.209" width instead of 0.295" width) that require PCB layout verification before substitution.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	Product Status
74ACQ241SC	onsemi	Buffer, Non-Inverting	2	4	3-State	24, 24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (0.295")	Obsolete
74AC244SC	Fairchild Semiconductor	Buffer, Non-Inverting	2	4	3-State	24, 24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (0.295")	Active
MC74AC244DWG	onsemi	Buffer, Non-Inverting	2	4	3-State	24, 24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (0.295")	Active
SN74AC241DWR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24, 24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (0.295")	Active
SN74AC241NSR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24, 24	2V ~ 6V	-40°C ~ 85°C	20-SO (0.209")	Active
SN74AC241DW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24, 24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (0.295")	Last Time Buy
SN74AC244DW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24, 24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (0.295")	Discontinued at DiGi Electronics

Engineering Selection Recommendations

For new designs and ongoing production requiring the 74ACQ241SC, the following parts are recommended based on product status and availability:

Primary Substitutes (Active Status): 74AC244SC (Fairchild Semiconductor), MC74AC244DWG (onsemi), and SN74AC241DWR (Texas Instruments) are all active products with identical electrical specifications and 20-SOIC package footprints matching the original part. These provide the highest long-term availability and supply chain stability.

Secondary Substitutes (Limited Availability): SN74AC241DW (Last Time Buy status) and SN74AC244DW (Discontinued at DiGi Electronics) remain functionally equivalent but face supply constraints. These are suitable only when primary substitutes are unavailable.

Package Variant Consideration: SN74AC241NSR uses a 20-SO package (0.209" width) instead of the standard 20-SOIC (0.295" width). While electrically equivalent, this package variant requires PCB layout verification to confirm mechanical compatibility with existing footprints before implementation.

All substitute parts listed maintain compliance with REACH regulations and EAR99 export classification, consistent with the original 74ACQ241SC specifications.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74ACQ241SC with 74AC244SC on my PCB?

A: Yes. The 74AC244SC is a parametric equivalent with identical electrical specifications (2V ~ 6V supply, 24mA output current, -40°C ~ 85°C operating range) and uses the same 20-SOIC (0.295" width) package footprint. No PCB modifications are required.

Q: What is the difference between SN74AC241DWR and SN74AC244DW?

A: Both parts are functionally equivalent with identical electrical specifications and 20-SOIC package dimensions. The primary difference is product status: SN74AC241DWR is Active, while SN74AC244DW is Discontinued at DiGi Electronics. For new designs, SN74AC241DWR is preferred for supply continuity.

Q: Can I use SN74AC241NSR as a substitute if other parts are unavailable?

A: SN74AC241NSR is electrically equivalent but uses a 20-SO package (0.209" width) instead of the standard 20-SOIC (0.295" width). Mechanical compatibility with your existing PCB footprint must be verified before substitution. If your design uses a 20-SOIC footprint, this part may not fit without layout modifications.

Q: Are all substitute parts RoHS compliant?

A: Most substitute parts listed (MC74AC244DWG, SN74AC241DWR, SN74AC241NSR, SN74AC241DW, SN74AC244DW) are ROHS3 compliant. The original 74ACQ241SC does not specify RoHS status. Verify RoHS compliance requirements for your specific application before final part selection.

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

A: 74AC244SC (Fairchild Semiconductor), MC74AC244DWG (onsemi), and SN74AC241DWR (Texas Instruments) all carry Active product status, indicating ongoing manufacturing and distribution. These three parts provide the most reliable long-term supply chain options.

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