DM74AS240N Equivalent & Substitute Parts

Part Overview

The DM74AS240N is a logic buffer IC manufactured by onsemi, featuring inverting 2-element, 4-bit per element architecture with 3-state output capability. This device operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-DIP package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Substiute Parts

DM74AS240N

onsemiIn Stock: 1740DM74AS240N Datasheet

Current PartRFQ

SN74AS240AN

Texas InstrumentsIn Stock: 838SN74AS240AN Datasheet

Parametric EquivalentRFQ

SN74BCT240N

Texas InstrumentsIn Stock: 2332SN74BCT240N Datasheet

Parametric EquivalentRFQ

SN74F240N

Texas InstrumentsIn Stock: 3112SN74F240N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DM74AS240N are identified based on strict parametric equivalence across the following criteria:

• Logic type and function (Buffer, Inverting)
• Element and bit configuration (2 elements, 4 bits per element)
• Output architecture (3-State)
• Output current specifications (15mA high, 64mA low)
• Supply voltage range (4.5V ~ 5.5V)
• Operating temperature range (0°C ~ 70°C)
• Physical package format (20-DIP)
• Mounting technology (Through Hole)

All substitute parts listed maintain identical electrical and mechanical parameters to the main part, ensuring direct functional compatibility in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts—SN74AS240AN, SN74BCT240N, and SN74F240N—are manufactured by Texas Instruments and maintain active product status, ensuring long-term availability and supply chain stability. Each substitute part is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

The SN74AS240AN represents the closest functional equivalent, belonging to the same 74AS logic family as the original DM74AS240N. The SN74BCT240N and SN74F240N, while from different logic families (74BCT and 74F respectively), satisfy all parametric requirements for direct substitution. Selection among these alternatives should be based on supply availability, lead time, and organizational procurement preferences, as all three parts are electrically and mechanically interchangeable within the specified operating conditions.

Frequently Asked Questions (FAQ)

Q: Can SN74AS240AN, SN74BCT240N, and SN74F240N be used interchangeably with DM74AS240N?

A: Yes. All three parts maintain identical electrical parameters (output current, supply voltage, operating temperature) and physical package specifications (20-DIP through-hole). Direct pin-for-pin substitution is supported without circuit modification.

Q: What is the primary reason for seeking substitutes for the DM74AS240N?

A: The DM74AS240N is classified as obsolete. The listed substitutes are active products from Texas Instruments, ensuring continued availability and supply chain support.

Q: Are there differences in logic family between the substitute parts?

A: Yes. The SN74AS240AN belongs to the 74AS family, while SN74BCT240N belongs to the 74BCT family, and SN74F240N belongs to the 74F family. Despite these family designations, all three parts meet the identical parametric requirements for the DM74AS240N application.

Q: Do the substitute parts meet current environmental compliance standards?

A: Yes. All three substitute parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and distribution.

Q: Is the 20-DIP package format consistent across all parts?

A: Yes. The DM74AS240N and all three substitute parts use the 20-DIP (0.300", 7.62mm) through-hole package, ensuring mechanical compatibility with existing PCB designs and assembly processes.