SN74ACT244N-NG Equivalent & Substitute Parts

Part Overview

The SN74ACT244N-NG is a non-inverting buffer logic integrated circuit manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability. This device is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The 20-PDIP through-hole package configuration requires careful consideration when evaluating alternative components to ensure mechanical and electrical compatibility with existing circuit board layouts.

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)
Mounting Type	Through Hole
Package / Case	20-DIP (0.300", 7.62mm)
Series	74ACT
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SN74ACT244N-NG is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

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)
Series: 74ACT

Mechanical Compatibility Requirements:

Mounting Type: Through Hole (for direct PCB replacement)
Package / Case: 20-DIP (0.300", 7.62mm) (for socket and footprint compatibility)

Substitute parts are categorized into two groups:

Group 1 - Manufacturer Recommended (Active Status): SN74ACT244PWR represents the manufacturer's recommended upgrade path, offering identical electrical specifications with surface-mount packaging for modern manufacturing processes.

Group 2 - Parametric Equivalents (Through-Hole Packages): Parts maintaining identical electrical parameters and through-hole mounting include SN74ACT244N, SN74ACT241N, MC74ACT241N, CD74ACT241E, and CD74ACT244E. These parts satisfy direct substitution criteria for through-hole applications.

Parameter Comparison

Parameter	SN74ACT244N-NG	SN74ACT244PWR	SN74ACT244N	SN74ACT241N	MC74ACT241N	CD74ACT244E	CD74ACT241E
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Motorola	Harris Corporation	Harris Corporation
Logic Type	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting
Number of Elements	2	2	2	2	2	2	2
Number of Bits per Element	4	4	4	4	4	4	4
Output Type	3-State	3-State	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Through Hole	Surface Mount	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	20-DIP (0.300", 7.62mm)	20-TSSOP (0.173", 4.40mm Width)	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)
Series	74ACT	74ACT	74ACT	74ACT	74ACT	74ACT	74ACT
Product Status	Obsolete	Active	Active	Active	Active	Obsolete	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant

Engineering Selection Recommendations

For Direct Through-Hole PCB Replacement (Same Package):

SN74ACT244N is the primary selection for direct substitution. This part maintains identical electrical specifications, through-hole mounting configuration, and 20-DIP package footprint. The part carries Active product status and ROHS3 compliance, providing long-term availability and regulatory alignment with modern manufacturing standards.

SN74ACT241N serves as an alternative through-hole substitute with equivalent electrical parameters and identical package configuration. This part is also Active status with ROHS3 compliance.

For Surface-Mount Design Transitions:

SN74ACT244PWR is the manufacturer-recommended upgrade path when transitioning from through-hole to surface-mount technology. This part maintains all electrical equivalence parameters while offering the 20-TSSOP package format. Active product status and ROHS3 compliance ensure sustained supply chain support.

For Legacy System Maintenance:

CD74ACT244E and CD74ACT241E provide parametric equivalence with through-hole packaging for systems requiring component-level replacement without design modification. These parts are classified as Obsolete and carry RoHS non-compliance status, limiting their use to legacy applications where regulatory exemptions apply.

MC74ACT241N offers through-hole compatibility with equivalent electrical specifications. Active product status supports availability, though RoHS non-compliance status requires evaluation against application regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT244PWR replace SN74ACT244N-NG in an existing through-hole PCB design?

A: No. SN74ACT244PWR uses 20-TSSOP surface-mount packaging, which is incompatible with through-hole PCB footprints and sockets designed for 20-DIP packages. Design modification and PCB rework are required for this substitution.

Q: What is the difference between SN74ACT244N and SN74ACT241N?

A: Both parts maintain identical electrical specifications, output current ratings, supply voltage range, and operating temperature. The primary distinction is the base product number designation (74ACT244 versus 74ACT241), which reflects internal logic configuration differences not affecting the specified electrical parameters for buffer operation.

Q: Are CD74ACT244E and CD74ACT241E suitable for new designs?

A: These parts carry Obsolete product status and RoHS non-compliance classification. They are suitable only for legacy system maintenance and repair where regulatory exemptions apply. New designs should utilize Active status parts such as SN74ACT244N or SN74ACT244PWR.

Q: Does MC74ACT241N provide full compatibility with SN74ACT244N-NG?

A: MC74ACT241N maintains electrical equivalence across all specified parameters and uses identical 20-DIP through-hole packaging. However, this part carries RoHS non-compliance status. Regulatory and compliance requirements for the target application must be evaluated before selection.

Q: What packaging options are available for 74ACT244 buffer logic?

A: The 74ACT244 series is available in two primary package formats: 20-DIP (0.300", 7.62mm) for through-hole mounting, represented by SN74ACT244N, and 20-TSSOP (0.173", 4.40mm Width) for surface-mount applications, represented by SN74ACT244PWR. Package selection depends on PCB design methodology and manufacturing process requirements.

Q: Is inventory availability a factor in part selection?

A: Inventory levels are provided for reference but do not determine substitution eligibility. Selection must be based on electrical equivalence, mechanical compatibility, and product status. Inventory availability should be confirmed through current supplier data at the time of procurement.

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