DM74LS244WM Equivalent & Substitute Parts

Part Overview

The DM74LS244WM is a Buffer, Non-Inverting logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability in a 20-SOIC package. This component operates within the 4.75V to 5.25V supply voltage range and is rated for 0°C to 70°C operating temperature. The part is classified as obsolete, making identification of equivalent and substitute components essential for design continuity and procurement planning.

Substiute Parts

DM74LS244WM

onsemiIn Stock: 1614DM74LS244WM Datasheet

Current PartRFQ

SN74LS244DW

Texas InstrumentsIn Stock: 2000239SN74LS244DW Datasheet

DirectRFQ

SN74LS244DWR

Texas InstrumentsIn Stock: 9925SN74LS244DWR Datasheet

DirectRFQ

SN74LS244NSR

Texas InstrumentsIn Stock: 4226SN74LS244NSR Datasheet

SimilarRFQ

SN74LS241DW

Texas InstrumentsIn Stock: 1515SN74LS241DW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74LS244WM is determined by strict alignment of the following parameters: Logic Type (Buffer, Non-Inverting), Number of Elements (2), Number of Bits per Element (4), Output Type (3-State), Current ratings (15mA output high, 24mA output low), Supply Voltage range (4.75V ~ 5.25V), Operating Temperature range (0°C ~ 70°C), and Package configuration (20-SOIC with 0.295" width).

Substitute parts are categorized as follows:

Direct Manufacturer Substitutes maintain identical electrical and mechanical specifications with the same base product number (74LS244) and package footprint, differing only in manufacturer and product status.

Similar Manufacturer Substitutes share all electrical parameters but feature a narrower package width (0.209" versus 0.295"), classified as 20-SO rather than 20-SOIC, requiring PCB layout verification for mechanical compatibility.

Parametric Equivalents maintain all electrical specifications but use an alternative base product number (74LS241 versus 74LS244), indicating functional equivalence within the 74LS logic family while requiring application-level verification.

Parameter Comparison

Engineering Selection Recommendations

For new designs and procurement, SN74LS244DWR is the primary recommendation. This Texas Instruments part maintains identical electrical and mechanical specifications to the DM74LS244WM while offering Active product status, ensuring long-term availability and supply chain stability. ROHS3 compliance aligns with current environmental and regulatory standards.

SN74LS244DW provides an alternative direct substitute with equivalent electrical performance and ROHS3 compliance, though its Last Time Buy status indicates limited future availability.

SN74LS244NSR is suitable for applications where package width constraints permit the narrower 20-SO footprint (0.209" versus 0.295"). This part maintains Active status and full electrical equivalence, requiring only PCB layout verification for mechanical compatibility.

SN74LS241DW serves as a parametric equivalent for applications where the 74LS241 base product number is functionally acceptable. This part shares all electrical specifications and package dimensions with the original component, though it represents a different product line within the 74LS logic family.

Frequently Asked Questions (FAQ)

Q: Can SN74LS244DWR be used as a direct replacement for DM74LS244WM?

A: Yes. SN74LS244DWR maintains identical electrical specifications (Logic Type, element count, bit configuration, output type, current ratings, supply voltage, and operating temperature) and package footprint (20-SOIC, 0.295" width). The primary difference is manufacturer and product status; SN74LS244DWR is Active and ROHS3 compliant.

Q: What is the difference between SN74LS244DW and SN74LS244DWR?

A: Both parts are direct substitutes with identical electrical and mechanical specifications. The difference is packaging format: SN74LS244DW is supplied in Tube packaging, while SN74LS244DWR is supplied in Cut Tape (CT) & Digi-Reel format. SN74LS244DWR has Active product status; SN74LS244DW is Last Time Buy.

Q: Can SN74LS244NSR be used in place of DM74LS244WM?

A: SN74LS244NSR is electrically equivalent but uses a narrower 20-SO package (0.209" width) compared to the 20-SOIC package (0.295" width) of the original part. PCB layout verification is required to confirm mechanical compatibility before substitution.

Q: Is SN74LS241DW a suitable substitute?

A: SN74LS241DW is a parametric equivalent with identical electrical specifications and package dimensions. However, it uses a different base product number (74LS241 versus 74LS244), indicating a different product line within the 74LS logic family. Application-level verification is necessary to confirm functional compatibility.

Q: Why is RoHS compliance important for this substitution?

A: The original DM74LS244WM is RoHS non-compliant. All Texas Instruments substitutes (SN74LS244DW, SN74LS244DWR, SN74LS244NSR, and SN74LS241DW) are ROHS3 compliant, meeting current environmental and regulatory requirements for new designs and procurement.

Q: Which substitute offers the best long-term availability?

A: SN74LS244DWR and SN74LS244NSR both maintain Active product status, ensuring continued availability. SN74LS244DW and SN74LS241DW are Last Time Buy, indicating limited future supply.