74ACTQ244SC Equivalent & Substitute Parts

Part Overview

The 74ACTQ244SC 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 at 4.5V to 5.5V supply voltage 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
Manufacturer Part Number	74ACTQ244SC
Manufacturer	onsemi
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	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	20-SOIC (0.295", 7.50mm Width)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 74ACTQ244SC 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: 4.5V ~ 5.5V
Package / Case: 20-SOIC (0.295", 7.50mm Width)

Substitute parts are grouped into two categories:

Direct Substitutes (Active Status): Parts with identical electrical specifications and 20-SOIC (0.295", 7.50mm Width) packaging from active product lines.

Parametric Equivalents (Obsolete Status): Parts with matching electrical specifications but different packaging designations or product status.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	Status
74ACTQ244SC	onsemi	Buffer, Non-Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (0.295")	Obsolete
74ACT244SC	onsemi	Buffer, Non-Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (0.295")	Active
MC74ACT244DWR2G	onsemi	Buffer, Non-Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (0.295")	Active
MC74ACT244DWG	onsemi	Buffer, Non-Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (0.295")	Active
CD74ACT244M96	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (0.295")	Active
SN74ACT244DWR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (0.295")	Active
SN74ACT244IDWREP	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (0.295")	Active
SN74ACT244MDWREP	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-55°C ~ 125°C	20-SOIC (0.295")	Active
SN74ACT244MNSREP	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-55°C ~ 125°C	20-SO (0.209")	Active
SN74ACT244NSR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SO (0.209")	Active
MC74ACT241DWG	onsemi	Buffer, Non-Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (0.295")	Obsolete

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

74ACT244SC, MC74ACT244DWR2G, and MC74ACT244DWG from onsemi are active product line equivalents with identical electrical specifications and packaging. These parts provide direct functional replacement with current manufacturer support and RoHS3 compliance.

Cross-Manufacturer Alternatives:

SN74ACT244DWR and CD74ACT244M96 from Texas Instruments offer equivalent functionality with active product status. Both maintain identical electrical parameters and 20-SOIC (0.295") packaging, enabling seamless substitution in existing designs.

Extended Temperature Range Option:

SN74ACT244MDWREP provides an extended operating temperature range of -55°C to 125°C compared to the standard -40°C to 85°C, suitable for applications requiring broader thermal performance.

Alternate Packaging Consideration:

SN74ACT244MNSREP and SN74ACT244NSR utilize 20-SO (0.209") packaging instead of 20-SOIC (0.295"), resulting in a narrower package width. These parts maintain electrical equivalence but require PCB layout modification for physical compatibility.

Obsolete Parametric Equivalent:

MC74ACT241DWG shares identical electrical specifications and packaging with the 74ACTQ244SC but carries obsolete product status. This part is suitable only when existing inventory must be utilized.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74ACTQ244SC with 74ACT244SC?

A: Yes. Both parts are non-inverting buffers with 2 elements, 4 bits per element, 3-state output, 24mA output current, 4.5V to 5.5V supply voltage, and identical 20-SOIC (0.295") packaging. The primary difference is product status: 74ACTQ244SC is obsolete while 74ACT244SC is active.

Q: What is the difference between 20-SOIC (0.295") and 20-SO (0.209") packages?

A: Both are 20-pin surface mount packages with identical pin count and electrical specifications. The primary difference is package width: 20-SOIC (0.295") is wider than 20-SO (0.209"). PCB footprints are not interchangeable without layout modification.

Q: Are Texas Instruments and onsemi parts functionally equivalent?

A: Yes, for the specified electrical parameters. SN74ACT244DWR, CD74ACT244M96, and equivalent Texas Instruments parts maintain identical logic type, element count, bit configuration, output type, current ratings, and supply voltage as the 74ACTQ244SC. Cross-manufacturer substitution is electrically valid.

Q: Does SN74ACT244MDWREP offer any advantage over other substitutes?

A: SN74ACT244MDWREP extends the operating temperature range to -55°C to 125°C, compared to the standard -40°C to 85°C range. This wider thermal specification is beneficial for applications requiring operation in extreme temperature environments.

Q: What compliance certifications apply to these substitute parts?

A: Active substitute parts carry RoHS3 compliance. All parts listed maintain REACH Unaffected status and EAR99 export classification. Moisture Sensitivity Level (MSL) varies between parts: MSL 1 (Unlimited) or MSL 3 (168 Hours).

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