DM74AS244WMX Equivalent & Substitute Parts

Part Overview

The DM74AS244WMX is a non-inverting buffer 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 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The DM74AS244WMX operates within a 4.5V to 5.5V supply voltage range and is rated for 0°C to 70°C operating temperature. Its 3-state output configuration enables bus-oriented applications requiring multiple drivers on a single signal line.

Substiute Parts

DM74AS244WMX

onsemiIn Stock: 2255DM74AS244WMX Datasheet

Current PartRFQ

SN74AS244ADW

Texas InstrumentsIn Stock: 1197SN74AS244ADW Datasheet

DirectRFQ

SN74AS760DWR

Texas InstrumentsIn Stock: 2217SN74AS760DWR Datasheet

DirectRFQ

SN74AS244ANSR

Texas InstrumentsIn Stock: 3195SN74AS244ANSR Datasheet

SimilarRFQ

SN74AS244ADWR

Texas InstrumentsIn Stock: 879SN74AS244ADWR Datasheet

Parametric EquivalentRFQ

SN74BCT244DWR

Texas InstrumentsIn Stock: 735SN74BCT244DWR Datasheet

Parametric EquivalentRFQ

SN74F244DWR

Texas InstrumentsIn Stock: 7819SN74F244DWR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DM74AS244WMX is determined by strict equivalence across the following critical parameters:

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

Substitute parts are categorized as follows:

Direct Substitutes (Identical Electrical and Mechanical Parameters): Parts that match all key parameters and can be used as pin-for-pin replacements.

Parametric Equivalents (Same Electrical Function, Different Series or Status): Parts that maintain identical electrical specifications but may differ in product series or availability status.

Similar Parts (Package Variation): Parts with identical electrical specifications but different package dimensions, requiring PCB layout verification.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation - SN74AS244ADWR (Texas Instruments): This part provides full parametric equivalence to the DM74AS244WMX with identical electrical specifications, 20-SOIC package dimensions, and active product status. ROHS3 compliance ensures regulatory alignment for modern manufacturing environments. Tape & Reel packaging supports automated assembly processes.

Secondary Recommendation - SN74F244DWR (Texas Instruments): Maintains identical electrical parameters and package specifications with active product status and highest available inventory (7783 Pcs). ROHS3 compliant. Suitable for applications where 74F series logic family compatibility is acceptable.

Alternative for Cost Optimization - SN74BCT244DWR (Texas Instruments): Provides parametric equivalence with active status and ROHS3 compliance. 74BCT series offers alternative logic family characteristics while maintaining identical pin configuration and electrical performance.

Package Variant - SN74AS244ANSR (Texas Instruments): Electrically identical to the main part but features a narrower 20-SO package (0.209" width versus 0.295"). Requires PCB layout verification due to package dimension difference. Active status and ROHS3 compliance confirmed.

Not Recommended - SN74AS760DWR: While mechanically compatible, this part features open collector output instead of 3-state output, fundamentally altering circuit behavior. Suitable only for applications specifically requiring open collector logic.

Frequently Asked Questions (FAQ)

Q: Can SN74AS244ADWR be used as a direct replacement for DM74AS244WMX?

A: Yes. SN74AS244ADWR matches all critical electrical parameters (2 elements, 4 bits per element, 3-state output, 15mA/64mA current ratings, 4.5V-5.5V supply, 0°C-70°C operating range) and package specifications (20-SOIC, 0.295" width). Pin configuration is identical, enabling direct PCB substitution.

Q: What is the difference between SN74AS244ADWR and SN74F244DWR?

A: Both parts are parametrically equivalent with identical electrical specifications and 20-SOIC packaging. The primary difference is logic family: 74AS versus 74F. Both are active products with ROHS3 compliance. Selection depends on design requirements and inventory availability.

Q: Why is SN74AS244ANSR listed as a similar part rather than a direct substitute?

A: SN74AS244ANSR features a narrower 20-SO package (0.209" width) compared to the standard 20-SOIC package (0.295" width). While electrically identical, the reduced package width requires PCB layout verification to confirm footprint compatibility. Pin count and electrical function remain unchanged.

Q: Can SN74AS760DWR replace the DM74AS244WMX?

A: No. Although SN74AS760DWR shares the same package and pin count, it features open collector output instead of 3-state output. This fundamental difference in output configuration makes it unsuitable for direct replacement in 3-state bus applications.

Q: What does "Last Time Buy" status mean for SN74AS244ADW?

A: Last Time Buy indicates that Texas Instruments has announced end-of-life for this part. While currently available (1093 Pcs in stock), future procurement may become impossible. For new designs, SN74AS244ADWR (active status) is preferred.

Q: Are all substitute parts ROHS3 compliant?

A: All Texas Instruments substitute parts listed (SN74AS244ADW, SN74AS244ADWR, SN74BCT244DWR, SN74F244DWR, SN74AS244ANSR, SN74AS760DWR) are ROHS3 compliant. The original DM74AS244WMX RoHS status is not specified in available documentation.