DM74AS240WM Equivalent & Substitute Parts

Part Overview

The DM74AS240WM is a buffer inverting logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs. The part operates within a 4.5V to 5.5V supply voltage range and is housed in a 20-SOIC package suitable for surface mount applications.

Substiute Parts

DM74AS240WM

onsemiIn Stock: 1351DM74AS240WM Datasheet

Current PartRFQ

SN74AS240ADWR

Texas InstrumentsIn Stock: 2865SN74AS240ADWR Datasheet

DirectRFQ

SN74AS240ANSR

Texas InstrumentsIn Stock: 809SN74AS240ANSR Datasheet

SimilarRFQ

SN74AS240ADW

Texas InstrumentsIn Stock: 823SN74AS240ADW Datasheet

Parametric EquivalentRFQ

SN74BCT240DW

Texas InstrumentsIn Stock: 1230SN74BCT240DW Datasheet

Parametric EquivalentRFQ

SN74F240DW

Texas InstrumentsIn Stock: 1521SN74F240DW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DM74AS240WM are classified based on the following substitution criteria:

Direct Manufacturer Equivalent: Parts that maintain identical electrical and mechanical specifications with the original component, differing only in manufacturer or packaging format.

Similar Manufacturer Equivalent: Parts that share core functional parameters but may have minor package dimension variations while maintaining electrical compatibility.

Parametric Equivalent: Parts that satisfy all critical electrical parameters and functional requirements, though they may belong to different logic series (74AS, 74BCT, 74F) with different performance characteristics.

The key parameters determining substitutability are:

• Logic Type: Buffer, 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 or 20-SO

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74AS240ADWR (Texas Instruments) is the optimal direct substitute. It maintains identical electrical specifications and package dimensions while offering active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Secondary Recommendation: SN74AS240ADW (Texas Instruments) provides equivalent functionality with active status and ROHS3 compliance. Packaging format differs only in tape and reel configuration, suitable for high-volume applications.

Alternative for Compact Designs: SN74AS240ANSR (Texas Instruments) offers the same electrical performance with a narrower package width (0.209" vs 0.295"), applicable where PCB space constraints exist. Tape and reel packaging supports automated assembly.

Extended Compatibility Options: SN74BCT240DW and SN74F240DW maintain all critical electrical parameters and package dimensions. SN74BCT240DW represents an alternative logic family with active status. SN74F240DW is available but carries Last Time Buy status, limiting future procurement viability.

All substitute parts are REACH Unaffected and carry EAR99 ECCN classification, matching the original component's regulatory profile.

Frequently Asked Questions (FAQ)

Q: Can SN74AS240ADWR directly replace DM74AS240WM without circuit modifications?

A: Yes. SN74AS240ADWR maintains identical electrical specifications (supply voltage, output current, operating temperature range) and package dimensions (20-SOIC 0.295" width), enabling direct substitution without design changes.

Q: What is the difference between SN74AS240ANSR and SN74AS240ADW?

A: Both parts share identical electrical specifications and logic series (74AS). The primary difference is package width: SN74AS240ANSR uses a narrower 20-SO package (0.209"), while SN74AS240ADW uses the standard 20-SOIC package (0.295"). Packaging format also differs (tape and reel vs. tube). Electrical compatibility is maintained.

Q: Why is SN74F240DW marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer has announced end-of-life for this product. While currently available, future procurement may become restricted. For new designs, SN74AS240ADWR or SN74AS240ADW are preferred for sustained availability.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status, meeting current environmental and regulatory requirements. The original DM74AS240WM does not specify RoHS status.

Q: Can SN74BCT240DW be used as a substitute despite belonging to the 74BCT series?

A: SN74BCT240DW maintains all critical electrical parameters (output current, supply voltage, operating temperature, logic function) and identical package dimensions. The 74BCT series represents a different logic family with different internal characteristics, but functional substitution is supported for applications requiring the specified electrical performance.

Q: What inventory levels are available for each substitute?

A: SN74AS240ADWR: 2800 pcs; SN74AS240ADW: 803 pcs; SN74AS240ANSR: 776 pcs; SN74BCT240DW: 1133 pcs; SN74F240DW: 1509 pcs. Inventory levels support both prototype and production-volume requirements.