DM74ALS240AN Equivalent & Substitute Parts

Part Overview

The DM74ALS240AN 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-DIP package, this component operates within a 4.5V to 5.5V supply voltage range and is rated for 0°C to 70°C operating temperature. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing system support and procurement.

Substiute Parts

DM74ALS240AN

onsemiIn Stock: 1445DM74ALS240AN Datasheet

Current PartRFQ

SN74ALS240AN

Texas InstrumentsIn Stock: 5415SN74ALS240AN Datasheet

DirectRFQ

SN74ALS240A-1N

Texas InstrumentsIn Stock: 2194SN74ALS240A-1N Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DM74ALS240AN are identified based on strict electrical and mechanical parameter alignment. The critical parameters determining substitution eligibility are:

• 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)
• Package / Case: 20-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole

All identified substitutes maintain these core parameters. Variations in output current specifications and product status are noted in the comparison table below.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS240AN manufactured by Texas Instruments is the primary direct equivalent to the DM74ALS240AN. Both parts maintain identical electrical specifications and package configuration. The SN74ALS240AN carries Active product status and ROHS3 compliance, providing advantages for new designs and long-term availability.

The SN74ALS240A-1N is a secondary substitute option, also from Texas Instruments with Active status and ROHS3 compliance. This part differs in output low current specification (48mA versus 24mA), which may be suitable for applications requiring higher current drive capability at the output low state while maintaining all other functional and mechanical parameters.

Selection between these substitutes should be based on current drive requirements and compliance certifications applicable to the target application.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS240AN directly replace the DM74ALS240AN?

A: Yes. The SN74ALS240AN maintains identical logic type, element configuration, output type, supply voltage range, operating temperature range, and 20-DIP package specification. Both parts are functionally equivalent for circuit applications.

Q: What is the difference between SN74ALS240AN and SN74ALS240A-1N?

A: The primary difference is output low current specification. The SN74ALS240AN provides 24mA output low current, while the SN74ALS240A-1N provides 48mA. All other electrical and mechanical parameters remain identical. Selection depends on circuit current drive requirements.

Q: Are these substitutes compatible with through-hole PCB designs?

A: Yes. All three parts feature Through Hole mounting type in 20-DIP (0.300", 7.62mm) package configuration, maintaining mechanical and electrical compatibility with existing PCB layouts designed for the DM74ALS240AN.

Q: What compliance certifications apply to the substitute parts?

A: Both Texas Instruments substitutes (SN74ALS240AN and SN74ALS240A-1N) are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Why is the DM74ALS240AN classified as obsolete?

A: The DM74ALS240AN is no longer in active production by onsemi. Active equivalent parts from Texas Instruments ensure continued availability and support for system maintenance and new procurement requirements.