DM74AS244WM Equivalent & Substitute Parts

Part Overview

The DM74AS244WM is a non-inverting buffer IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This component operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-SOIC package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	DM74AS244WM
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	15mA, 64mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the DM74AS244WM is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Logic Type: Buffer, Non-Inverting
Number of Elements: 2
Number of Bits per Element: 4
Output Type: 3-State
Current - Output High, Low: 15mA, 64mA
Voltage - Supply: 4.5V ~ 5.5V
Operating Temperature: 0°C ~ 70°C (TA)
Package / Case: 20-SOIC (0.295", 7.50mm Width)

Substitute parts are categorized as follows:

Direct Manufacturer Substitutes: Parts with identical electrical specifications and 20-SOIC packaging from active manufacturers.

Similar Substitutes: Parts meeting all electrical parameters but with minor package variations (20-SO vs. 20-SOIC width differences).

Parametric Equivalents: Parts with identical electrical and mechanical specifications but different product series or packaging options.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current High/Low (mA)	Supply Voltage	Temp Range	Package	Product Status
DM74AS244WM	onsemi	Buffer, Non-Inverting	2	4	3-State	15, 64	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC (0.295")	Obsolete
SN74AS244ADWR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15, 64	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC (0.295")	Active
SN74AS244ADW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15, 64	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC (0.295")	Last Time Buy
SN74AS244ANSR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15, 64	4.5V ~ 5.5V	0°C ~ 70°C	20-SO (0.209")	Active
SN74BCT244DW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15, 64	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC (0.295")	Last Time Buy
SN74F241DW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15, 64	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC (0.295")	Active
SN74F244DW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15, 64	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC (0.295")	Last Time Buy
SN74AS760DW	Texas Instruments	Buffer, Non-Inverting	2	4	Open Collector	—, 64	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC (0.295")	Last Time Buy

Engineering Selection Recommendations

Preferred Direct Substitutes (Active Status):

SN74AS244ADWR and SN74AS244ANSR are the primary recommendations for replacing the obsolete DM74AS244WM. Both are manufactured by Texas Instruments with Active product status, ensuring long-term availability and support. SN74AS244ADWR maintains identical 20-SOIC packaging (0.295" width), providing direct pin-compatible replacement. SN74AS244ANSR offers the same electrical specifications with a narrower 20-SO package (0.209" width), suitable for space-constrained applications where PCB layout permits the dimensional change.

Alternative Parametric Equivalents (Last Time Buy Status):

SN74AS244ADW, SN74BCT244DW, and SN74F244DW provide full electrical and mechanical compatibility with identical 20-SOIC packaging. These parts carry Last Time Buy status, indicating limited future availability. Selection among these options depends on procurement timeline and inventory requirements.

Series Variants:

SN74F241DW (74F series) and SN74BCT244DW (74BCT series) maintain all critical electrical parameters and package specifications. These represent alternative logic families within the same functional class, suitable for designs where series compatibility is not a constraint.

Non-Compatible Alternative:

SN74AS760DW features Open Collector output instead of 3-State output and differs in output high current specification. This part is not suitable as a direct substitute for applications requiring 3-State output capability.

Frequently Asked Questions (FAQ)

Q: Can SN74AS244ANSR replace DM74AS244WM directly on the PCB?

A: SN74AS244ANSR is electrically identical but uses a narrower 20-SO package (0.209" width) compared to the original 20-SOIC package (0.295" width). Pin spacing and lead configuration remain compatible. PCB footprint modification may be required depending on layout constraints.

Q: What is the difference between 74AS, 74F, and 74BCT series buffers?

A: All three series meet the specified electrical parameters for the DM74AS244WM. Series designation indicates the logic family technology. Selection should be based on product availability status and design requirements for propagation delay or power consumption characteristics not specified in the core parameters.

Q: Why is SN74AS760DW listed but not recommended?

A: SN74AS760DW differs in output type (Open Collector vs. 3-State). Open Collector output requires external pull-up resistors and is not functionally equivalent for applications designed for 3-State output control. This part is listed for reference only.

Q: Are all substitute parts RoHS3 compliant?

A: All Texas Instruments substitute parts listed carry RoHS3 Compliant status. The original onsemi DM74AS244WM does not specify RoHS status in available documentation.

Q: What packaging options are available for substitution?

A: Two package variants are available: 20-SOIC (0.295" width) and 20-SO (0.209" width). Both maintain identical pin counts and electrical specifications. Package selection depends on PCB design requirements and available footprint space.

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