MC74ACT244DW Equivalent & Substitute Parts

Part Overview

The MC74ACT244DW is a non-inverting buffer 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, which necessitates identification of active equivalent and substitute components for ongoing design support and procurement.

The MC74ACT244DW operates within the 74ACT logic family standard, providing buffering functionality suitable for digital signal distribution applications. Due to its obsolete status, equivalent active parts from both onsemi and Texas Instruments are available to maintain design continuity.

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	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Series	74ACT
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MC74ACT244DW is determined by strict equivalence across the following critical parameters:

Logic Type: Buffer, Non-Inverting
Number of Elements: 2
Number of Bits per Element: 4
Output Type: 3-State
Current Ratings: 24mA output high and low
Supply Voltage Range: 4.5V ~ 5.5V
Package Type: 20-SOIC with 0.295" (7.50mm) width
Mounting Type: Surface Mount

Substitute parts are grouped into three categories:

Direct Manufacturer Substitutes (onsemi): Parts with identical electrical specifications and packaging from the original manufacturer, differing only in product status (active vs. obsolete) and packaging format (tube vs. cut tape).

Parametric Equivalents (onsemi): Parts sharing identical electrical and mechanical specifications but with different base product numbers within the 74ACT family.

Cross-Manufacturer Equivalents (Texas Instruments): Parts from alternative manufacturers meeting all electrical and mechanical specifications, with variations in operating temperature ranges and moisture sensitivity levels.

Parameter Comparison

Part Number	Manufacturer	Product Status	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	RoHS Status	MSL
MC74ACT244DW	onsemi	Obsolete	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	Non-compliant	1
MC74ACT244DWG	onsemi	Active	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	ROHS3 Compliant	3
74ACT244SCX	onsemi	Active	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	ROHS3 Compliant	3
74ACT244SC	onsemi	Active	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	ROHS3 Compliant	3
CD74ACT244M96	Texas Instruments	Active	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	ROHS3 Compliant	1
SN74ACT244DWR	Texas Instruments	Active	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	ROHS3 Compliant	1
SN74ACT244IDWREP	Texas Instruments	Active	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	ROHS3 Compliant	1
SN74ACT244MDWREP	Texas Instruments	Active	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-55°C ~ 125°C	20-SOIC (7.50mm)	ROHS3 Compliant	1
SN74ACT244MNSREP	Texas Instruments	Active	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-55°C ~ 125°C	20-SO (5.30mm)	ROHS3 Compliant	1
SN74ACT244NSR	Texas Instruments	Active	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SO (5.30mm)	ROHS3 Compliant	1
MC74ACT241DWG	onsemi	Obsolete	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	ROHS3 Compliant	3

Engineering Selection Recommendations

Primary Recommendation: MC74ACT244DWG (onsemi) is the direct active equivalent of the MC74ACT244DW. This part maintains identical electrical specifications and package dimensions while offering active product status and ROHS3 compliance. The transition from MSL 1 to MSL 3 reflects standard moisture sensitivity for active production components.

Alternative onsemi Options: 74ACT244SCX and 74ACT244SC provide equivalent functionality with active status and ROHS3 compliance. These parts differ only in packaging format (cut tape/digi-reel vs. tube), allowing selection based on procurement and assembly requirements.

Cross-Manufacturer Alternatives: Texas Instruments SN74ACT244DWR and SN74ACT244IDWREP offer full electrical and mechanical equivalence with active status. SN74ACT244MDWREP extends the operating temperature range to -55°C ~ 125°C, suitable for industrial and military applications. SN74ACT244MNSREP and SN74ACT244NSR use the narrower 20-SO package (5.30mm width) and should be selected only when PCB layout constraints require reduced package width.

Compliance Consideration: All recommended active substitutes meet ROHS3 compliance requirements, addressing regulatory requirements for new designs. The original MC74ACT244DW is RoHS non-compliant and should not be used in new applications subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT244DW be directly replaced with MC74ACT244DWG?

A: Yes. MC74ACT244DWG is the active equivalent with identical electrical specifications, output current ratings, supply voltage range, and 20-SOIC package dimensions. The only differences are product status (active vs. obsolete) and packaging format (tube vs. original format).

Q: What is the difference between 20-SOIC (7.50mm) and 20-SO (5.30mm) packages?

A: The 20-SOIC (7.50mm) is the standard wide-body SOIC package. The 20-SO (5.30mm) is a narrower variant. These are not mechanically interchangeable on the same PCB footprint. Select 20-SO parts only if your PCB layout specifically requires the narrower package width.

Q: Why do some substitutes have different operating temperature ranges?

A: SN74ACT244MDWREP and SN74ACT244MNSREP extend the operating range to -55°C ~ 125°C, supporting military and industrial temperature specifications. Standard parts operate within -40°C ~ 85°C. Select the extended-range variant only if your application requires operation outside the standard temperature range.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The original MC74ACT244DW is RoHS non-compliant. For new designs subject to RoHS regulations, select any of the active equivalents.

Q: What does MSL (Moisture Sensitivity Level) mean for component selection?

A: MSL indicates moisture sensitivity during storage and handling. MSL 1 (unlimited) requires no special moisture control. MSL 3 (168 hours) requires storage in dry conditions and has a limited floor life after opening. For standard manufacturing environments, both levels are acceptable. Select based on your facility's moisture control capabilities.

Q: Can MC74ACT241DWG substitute for MC74ACT244DW?

A: MC74ACT241DWG shares identical electrical specifications and package dimensions but uses a different base product number (74ACT241 vs. 74ACT244). While electrically equivalent, this represents a parametric equivalent rather than a direct substitute. Verify compatibility with your specific circuit design before substitution.

Q: Which substitute offers the highest inventory availability?

A: SN74ACT244DWR from Texas Instruments has the highest inventory at 93,100 pieces. For applications requiring immediate availability, this part is the optimal choice.

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