74ACQ244SC Equivalent & Substitute Parts

Part Overview

The 74ACQ244SC is a non-inverting buffer logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This 20-SOIC surface mount device operates across a 2V to 6V supply range with 24mA output current capability. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ACQ244SC is determined by strict equivalence across the following critical parameters: logic type (buffer, non-inverting), element count (2), bits per element (4), output type (3-state), output current (24mA), supply voltage range (2V ~ 6V), operating temperature range (-40°C ~ 85°C), and package type (20-SOIC with 0.295" width). Parts are grouped into categories based on manufacturer, product status, and packaging format. Direct substitutes maintain identical electrical and mechanical specifications. Parametric equivalents meet all functional requirements but may differ in packaging or compliance certifications. Similar parts share core functionality but operate within different voltage or temperature ranges, requiring design verification before substitution.

Parameter Comparison

Part Number	Manufacturer	Product Status	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	Packaging Format
74ACQ244SC	onsemi	Obsolete	Buffer, Non-Inverting	2	4	3-State	24, 24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (0.295")	—
MC74AC244DWR2G	onsemi	Active	Buffer, Non-Inverting	2	4	3-State	24, 24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (0.295")	Cut Tape (CT) & Digi-Reel®
74AC244SC	Fairchild Semiconductor	Active	Buffer, Non-Inverting	2	4	3-State	24, 24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (0.295")	—
MC74AC244DWG	onsemi	Active	Buffer, Non-Inverting	2	4	3-State	24, 24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (0.295")	Tube
SN74AC244DWR	Texas Instruments	Active	Buffer, Non-Inverting	2	4	3-State	24, 24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (0.295")	Cut Tape (CT) & Digi-Reel®
SN74AC244MDWREP	Texas Instruments	Active	Buffer, Non-Inverting	2	4	3-State	24, 24	2V ~ 6V	-55°C ~ 125°C	20-SOIC (0.295")	Tape & Reel (TR)
CD74AC244M	Texas Instruments	Discontinued at DiGi Electronics	Buffer, Non-Inverting	2	4	3-State	24, 24	1.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (0.295")	Tube
CD74AC244M96	Texas Instruments	Active	Buffer, Non-Inverting	2	4	3-State	24, 24	1.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (0.295")	Tape & Reel (TR)
SN74AC244MNSREP	Texas Instruments	Active	Buffer, Non-Inverting	2	4	3-State	24, 24	2V ~ 6V	-55°C ~ 125°C	20-SO (0.209")	Tape & Reel (TR)
SN74AC244NSR	Texas Instruments	Active	Buffer, Non-Inverting	2	4	3-State	24, 24	2V ~ 6V	-40°C ~ 85°C	20-SO (0.209")	Tape & Reel (TR)
SN74AC241DW	Texas Instruments	Last Time Buy	Buffer, Non-Inverting	2	4	3-State	24, 24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (0.295")	Tube

Engineering Selection Recommendations

For direct replacement of the obsolete 74ACQ244SC, select MC74AC244DWR2G (onsemi) or SN74AC244DWR (Texas Instruments). Both parts are active products with identical electrical specifications and 20-SOIC (0.295") packaging. MC74AC244DWR2G is available in Cut Tape & Digi-Reel format, while SN74AC244DWR offers the same packaging option with ROHS3 compliance.

For applications requiring extended temperature operation (-55°C to 125°C), SN74AC244MDWREP provides upgraded thermal performance while maintaining all core electrical parameters. This part is supplied in Tape & Reel format and is ROHS3 compliant.

The 74AC244SC from Fairchild Semiconductor is a parametric equivalent with active product status, suitable for designs where manufacturer flexibility is acceptable.

For designs tolerating reduced supply voltage range (1.5V ~ 5.5V), CD74AC244M96 (active, Tape & Reel) or CD74AC244M (discontinued at DiGi Electronics, Tube) are available alternatives.

Parts with 20-SO packaging (0.209" width) such as SN74AC244MNSREP and SN74AC244NSR are not direct mechanical substitutes due to package width differences and require PCB layout verification.

SN74AC241DW is classified as Last Time Buy and should not be selected for new designs despite functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can MC74AC244DWR2G directly replace 74ACQ244SC without PCB modifications?

A: Yes. MC74AC244DWR2G is electrically and mechanically identical to 74ACQ244SC, with identical 20-SOIC (0.295" width) packaging. No PCB layout changes are required. The primary difference is product status (active vs. obsolete) and packaging format (Cut Tape & Digi-Reel vs. standard).

Q: What is the difference between SN74AC244DWR and SN74AC244MDWREP?

A: Both parts share identical electrical specifications and 20-SOIC packaging. SN74AC244MDWREP extends the operating temperature range to -55°C ~ 125°C compared to -40°C ~ 85°C for SN74AC244DWR. Select SN74AC244MDWREP only if your application requires the extended temperature range.

Q: Why are SN74AC244MNSREP and SN74AC244NSR listed as similar rather than direct substitutes?

A: These parts use 20-SO packaging with 0.209" width, compared to the 0.295" width of 20-SOIC used by 74ACQ244SC. The narrower package requires different PCB footprints and cannot be used as a direct drop-in replacement.

Q: Can CD74AC244M96 replace 74ACQ244SC in all applications?

A: CD74AC244M96 is functionally equivalent but operates within a reduced supply voltage range (1.5V ~ 5.5V) compared to 74ACQ244SC (2V ~ 6V). Substitution is valid only for designs operating within the 1.5V ~ 5.5V window. Verify your circuit's supply voltage before selection.

Q: What does "Last Time Buy" status mean for SN74AC241DW?

A: Last Time Buy indicates the manufacturer has announced end-of-life for this part. Existing inventory may be available, but no future production is planned. This part should not be selected for new designs. Use SN74AC244DWR or MC74AC244DWR2G instead.

Q: Are all substitute parts ROHS3 compliant?

A: Most active substitute parts carry ROHS3 compliance. Verify compliance documentation for your specific part selection and application requirements. The original 74ACQ244SC does not list ROHS status in available data.

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