DM74ALS240AWM Equivalent & Substitute Parts

Part Overview

The DM74ALS240AWM is a logic buffer IC with inverting functionality, featuring 2 elements with 4 bits per element and 3-state output capability. Manufactured by onsemi in a 20-SOIC package, this component operates within the 4.5V to 5.5V supply voltage range and is rated for 0°C to 70°C operating temperature. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing design support and procurement.

Substiute Parts

DM74ALS240AWM

onsemiIn Stock: 2595DM74ALS240AWM Datasheet

Current PartRFQ

SN74ALS240ADWR

Texas InstrumentsIn Stock: 2992SN74ALS240ADWR Datasheet

DirectRFQ

SN74ALS240A-1DW

Texas InstrumentsIn Stock: 1772SN74ALS240A-1DW Datasheet

SimilarRFQ

SN74ALS240A-1NSR

Texas InstrumentsIn Stock: 3184SN74ALS240A-1NSR Datasheet

SimilarRFQ

SN74ALS240ANSR

Texas InstrumentsIn Stock: 4998SN74ALS240ANSR Datasheet

SimilarRFQ

SN74ALS240ADW

Texas InstrumentsIn Stock: 1651SN74ALS240ADW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74ALS240AWM is determined by strict equivalence across the following critical parameters:

Core Functional Parameters:

• Logic Type: Buffer, Inverting
• Number of Elements: 2
• Number of Bits per Element: 4
• Output Type: 3-State
• Voltage - Supply: 4.5V ~ 5.5V
• Operating Temperature: 0°C ~ 70°C (TA)

Electrical Performance Parameters:

• Current - Output High, Low: 15mA, 24mA (primary specification)
• Current - Output High, Low: 15mA, 48mA (acceptable variant with higher low-side current capability)

Physical Parameters:

• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (0.295", 7.50mm Width) or 20-SO (0.209", 5.30mm Width)

Substitute parts are grouped into three categories based on their relationship to the main part: direct manufacturer equivalents, similar variants with acceptable parameter variations, and parametric equivalents with identical electrical specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

SN74ALS240ADWR and SN74ALS240ANSR are the preferred substitutes for the DM74ALS240AWM. Both are manufactured by Texas Instruments, maintain active product status, and provide ROHS3 compliance. SN74ALS240ADWR is packaged in 20-SOIC (0.295", 7.50mm Width) matching the original package footprint, while SN74ALS240ANSR uses the narrower 20-SO (0.209", 5.30mm Width) package. Both maintain identical electrical specifications with 15mA output high current and 24mA output low current.

Secondary Substitutes (Compatible Variants):

SN74ALS240A-1DW and SN74ALS240A-1NSR are functionally compatible alternatives with higher output low current capability (48mA versus 24mA). These parts are suitable for applications requiring increased sink current capacity. SN74ALS240A-1DW maintains the 20-SOIC (0.295", 7.50mm Width) package, while SN74ALS240A-1NSR uses the 20-SO (0.209", 5.30mm Width) package.

Compliance Considerations:

All Texas Instruments substitutes carry ROHS3 compliance certification, addressing modern environmental and regulatory requirements. The transition from the obsolete onsemi DM74ALS240AWM to active Texas Instruments alternatives ensures long-term supply chain stability and compliance with current manufacturing standards.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS240A-1DW or SN74ALS240A-1NSR be used as direct replacements for DM74ALS240AWM?

A: Yes. Both parts maintain identical logic functionality, element count, bit configuration, output type, supply voltage range, and operating temperature specifications. The higher output low current (48mA versus 24mA) represents increased capability and does not prevent substitution. Circuit design must accommodate the higher current capability without adverse effects.

Q: What is the difference between the 20-SOIC and 20-SO packages?

A: The 20-SOIC package measures 0.295" (7.50mm) in width, while the 20-SO package measures 0.209" (5.30mm) in width. Both are surface-mount packages with identical pin counts and electrical characteristics. PCB layout and footprint design must match the selected package variant.

Q: Why is the DM74ALS240AWM listed as obsolete?

A: Obsolete status indicates the part is no longer manufactured by onsemi. Active substitutes from Texas Instruments provide equivalent functionality with current manufacturing support and compliance certifications.

Q: Are there any electrical performance differences between SN74ALS240ADWR and SN74ALS240ANSR?

A: Both parts are electrically identical with 15mA output high current and 24mA output low current. The primary difference is packaging: SN74ALS240ADWR uses 20-SOIC (0.295", 7.50mm Width) while SN74ALS240ANSR uses 20-SO (0.209", 5.30mm Width). Selection depends on PCB layout requirements and available footprint space.

Q: What certifications do the Texas Instruments substitutes carry?

A: All Texas Instruments substitute parts (SN74ALS240ADWR, SN74ALS240A-1DW, SN74ALS240A-1NSR, and SN74ALS240ANSR) are ROHS3 compliant and carry REACH Unaffected status. These certifications align with current environmental and regulatory standards for electronic component manufacturing.