DM74AS244SJ Equivalent & Substitute Parts

Part Overview

The DM74AS244SJ is a non-inverting buffer logic 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-SOP package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.

Substiute Parts

DM74AS244SJ

onsemiIn Stock: 1086DM74AS244SJ Datasheet

Current PartRFQ

SN74AS244ANSR

Texas InstrumentsIn Stock: 3195SN74AS244ANSR Datasheet

DirectRFQ

SN74AS244ADW

Texas InstrumentsIn Stock: 1197SN74AS244ADW Datasheet

SimilarRFQ

SN74AS244ADWR

Texas InstrumentsIn Stock: 879SN74AS244ADWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DM74AS244SJ is determined by strict equivalence across the following 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)
• Mounting Type: Surface Mount
• Series: 74AS
• Moisture Sensitivity Level: 1 (Unlimited)

All identified substitute parts maintain these electrical and mechanical specifications. Package variations (20-SOP, 20-SO, 20-SOIC) are permitted within the same footprint family, as they accommodate the same pin configuration and electrical interface.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the DM74AS244SJ, the following Texas Instruments alternatives provide direct functional equivalence:

SN74AS244ANSR is the primary recommended substitute. This part maintains identical electrical specifications and operates in the same 74AS logic family. It carries Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

SN74AS244ADWR is an alternative substitute with Active product status and ROHS3 compliance. This part differs in package width (0.295" versus 0.209") but maintains electrical equivalence. PCB layout modifications may be required to accommodate the different package dimensions.

SN74AS244ADW is available with Last Time Buy status, indicating limited future availability. This part is suitable for immediate replacement needs but should not be selected for new designs requiring extended production windows.

All three substitutes are manufactured by Texas Instruments and comply with ROHS3 and REACH requirements, providing regulatory compliance advantages over the obsolete onsemi original.

Frequently Asked Questions (FAQ)

Q: Can SN74AS244ANSR directly replace DM74AS244SJ without circuit modifications?

A: Yes. Both parts maintain identical electrical specifications including logic type, element count, bit configuration, output type, current ratings, supply voltage range, and operating temperature. No circuit modifications are required.

Q: What is the difference between the SN74AS244ANSR and SN74AS244ADWR packages?

A: Both parts use 20-SOIC packages but differ in physical width. SN74AS244ANSR measures 0.209" (5.30mm) width, while SN74AS244ADWR measures 0.295" (7.50mm) width. PCB footprints must accommodate the selected package dimensions.

Q: Why is the DM74AS244SJ classified as obsolete?

A: The part has reached end-of-life status with onsemi. Active alternatives from Texas Instruments provide equivalent functionality with ongoing availability and regulatory compliance.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. SN74AS244ANSR, SN74AS244ADW, and SN74AS244ADWR all carry ROHS3 Compliant status, meeting current environmental and regulatory requirements.

Q: Which substitute should be selected for new designs?

A: SN74AS244ANSR is recommended for new designs. It maintains Active product status, ensuring long-term availability, and provides ROHS3 compliance with the same electrical and mechanical specifications as the original part.