DM74AS244N Equivalent & Substitute Parts

Part Overview

The DM74AS244N is a non-inverting buffer logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This device operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-pin DIP package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	DM74AS244N
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-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the DM74AS244N is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Logic Type: Buffer, Non-Inverting
Number of Elements: 2
Number of Bits per Element: 4
Output Type: 3-State (primary substitutes) or Open Collector (limited compatibility)
Current - Output High, Low: 15mA, 64mA
Voltage - Supply: 4.5V ~ 5.5V
Operating Temperature: 0°C ~ 70°C (TA)
Package / Case: 20-DIP (0.300", 7.62mm)
Mounting Type: Through Hole

Direct Manufacturer Substitutes maintain identical electrical and mechanical specifications with active product status from Texas Instruments.

Parametric Equivalents share all critical electrical parameters and package specifications but may differ in logic series (74AS, 74F, 74BCT) or base product number, providing functional compatibility within the same application context.

Output Type Variants such as the SN74AS760N (Open Collector output) are listed as alternatives where circuit design permits substitution of output stage characteristics.

Parameter Comparison

Part Number	Manufacturer	Series	Logic Type	Elements	Bits/Element	Output Type	Current High/Low (mA)	Supply Voltage	Temp Range	Package	Product Status
DM74AS244N	onsemi	74AS	Buffer, Non-Inverting	2	4	3-State	15, 64	4.5V ~ 5.5V	0°C ~ 70°C	20-DIP	Obsolete
SN74AS244AN	Texas Instruments	74AS	Buffer, Non-Inverting	2	4	3-State	15, 64	4.5V ~ 5.5V	0°C ~ 70°C	20-DIP	Active
SN74AS760N	Texas Instruments	74AS	Buffer, Non-Inverting	2	4	Open Collector	—, 64	4.5V ~ 5.5V	0°C ~ 70°C	20-DIP	Active
SN74AS241AN	Texas Instruments	74AS	Buffer, Non-Inverting	2	4	3-State	15, 64	4.5V ~ 5.5V	0°C ~ 70°C	20-DIP	Active
SN74AS244ANE4	Texas Instruments	74AS	Buffer, Non-Inverting	2	4	3-State	15, 64	4.5V ~ 5.5V	0°C ~ 70°C	20-DIP	Active
SN74BCT244N	Texas Instruments	74BCT	Buffer, Non-Inverting	2	4	3-State	15, 64	4.5V ~ 5.5V	0°C ~ 70°C	20-DIP	Active
SN74F241N	Texas Instruments	74F	Buffer, Non-Inverting	2	4	3-State	15, 64	4.5V ~ 5.5V	0°C ~ 70°C	20-DIP	Active
SN74F244N	Texas Instruments	74F	Buffer, Non-Inverting	2	4	3-State	15, 64	4.5V ~ 5.5V	0°C ~ 70°C	20-DIP	Active
SN74F244NE4	Texas Instruments	74F	Buffer, Non-Inverting	2	4	3-State	15, 64	4.5V ~ 5.5V	0°C ~ 70°C	20-DIP	Active

Engineering Selection Recommendations

Primary Substitute (Direct Replacement): SN74AS244AN from Texas Instruments is the direct equivalent, maintaining identical electrical specifications, 3-state output configuration, and 20-DIP package. This part carries active product status and ROHS3 compliance, making it the preferred choice for new designs and ongoing production support.

Series-Level Alternatives: SN74AS241AN and SN74AS244ANE4 provide parametric equivalence within the 74AS logic series, with identical electrical characteristics and package specifications. Both maintain active status and full compliance certifications.

Extended Logic Series Options: SN74BCT244N (74BCT series) and SN74F244N / SN74F241N (74F series) offer parametric equivalence across different logic families. All three maintain identical output current ratings, supply voltage range, and operating temperature specifications. These parts are suitable where logic family compatibility with existing circuit designs is established.

Output Type Variant: SN74AS760N provides an alternative with Open Collector output instead of 3-state. This substitution is valid only where circuit design explicitly accommodates open collector output characteristics and does not require the high-impedance state of 3-state logic.

Compliance and Availability: All Texas Instruments substitutes carry ROHS3 compliance and active product status, ensuring long-term availability and regulatory alignment. The onsemi DM74AS244N, being obsolete, should be replaced with an active equivalent for new designs.

Frequently Asked Questions (FAQ)

Q: Can SN74AS244AN directly replace DM74AS244N without circuit modification? A: Yes. SN74AS244AN is a direct equivalent with identical electrical specifications, output type (3-state), current ratings, supply voltage, operating temperature, and 20-DIP package configuration. No circuit modification is required.

Q: What is the difference between SN74AS244AN and SN74F244N? A: Both parts share identical electrical parameters (current, voltage, temperature, package). The primary difference is the logic series: 74AS versus 74F. Both are parametric equivalents suitable for the same application, though 74F series may have different propagation delay characteristics not specified in the provided parameters.

Q: Can SN74AS760N be used as a substitute? A: SN74AS760N is a functional alternative only if the circuit design permits Open Collector output operation. The 3-state output of the original DM74AS244N provides a high-impedance state; the Open Collector variant does not. Verify circuit requirements before substitution.

Q: Are all substitute parts RoHS compliant? A: All Texas Instruments substitutes listed (SN74AS244AN, SN74AS241AN, SN74AS244ANE4, SN74BCT244N, SN74F241N, SN74F244N, SN74F244NE4) carry ROHS3 compliance. The original onsemi DM74AS244N has MSL rating of 1 (Unlimited) but is obsolete.

Q: What is the difference between SN74AS244ANE4 and SN74AS244AN? A: Both parts are electrically and mechanically identical. The "NE4" suffix indicates a specific packaging or tape/reel configuration variant. Electrical specifications, pin configuration, and performance characteristics are identical.

Q: Which substitute offers the highest inventory availability? A: SN74F244N from Texas Instruments has the highest inventory level at 50,200 pieces in stock, followed by SN74AS244AN at 3,080 pieces. Both are suitable for immediate procurement.

Q: Are there any temperature or voltage derating considerations when substituting? A: All substitutes maintain the identical operating temperature range (0°C ~ 70°C) and supply voltage specification (4.5V ~ 5.5V). No derating adjustments are necessary when substituting between listed equivalents.

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