DM74ALS540AWM Equivalent & Substitute Parts

Part Overview

The DM74ALS540AWM is a logic buffer IC with inverting functionality, designed for 5.5V operation. This component features 1 element with 8 bits per element and 3-state output capability in a 20-SOIC surface mount package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design requirements and production continuity.

Substiute Parts

DM74ALS540AWM

onsemiIn Stock: 1415DM74ALS540AWM Datasheet

Current PartRFQ

SN74ALS540DW

Texas InstrumentsIn Stock: 4017SN74ALS540DW Datasheet

DirectRFQ

SN74ALS540DWR

Texas InstrumentsIn Stock: 3158SN74ALS540DWR Datasheet

DirectRFQ

SN74ALS540-1NSR

Texas InstrumentsIn Stock: 6308SN74ALS540-1NSR Datasheet

SimilarRFQ

SN74ALS540NSR

Texas InstrumentsIn Stock: 2229SN74ALS540NSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DM74ALS540AWM is determined by strict equivalence across the following critical parameters:

Direct Substitutes maintain identical electrical and mechanical specifications:

• Logic type: Buffer, Inverting
• Number of elements: 1
• Number of bits per element: 8
• Output type: 3-State
• Current ratings: 15mA (high), 24mA (low)
• Supply voltage: 4.5V ~ 5.5V
• Operating temperature: 0°C ~ 70°C
• Package: 20-SOIC with 0.295" (7.50mm) width
• Mounting type: Surface Mount

Similar Substitutes share the same functional and electrical characteristics but differ in package dimensions or output current specifications. These parts are functionally compatible but require physical layout verification.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Preferred):

SN74ALS540DWR (Texas Instruments) is the primary recommended substitute. This part maintains full electrical and mechanical equivalence to the DM74ALS540AWM, with identical package dimensions (20-SOIC, 0.295" width), current ratings, and supply voltage specifications. The part is currently in active production status with ROHS3 compliance certification.

SN74ALS540DW (Texas Instruments) provides equivalent functionality with identical electrical specifications and package dimensions. This part carries Last Time Buy status, indicating limited future availability.

Similar Substitutes (Package Variation):

SN74ALS540-1NSR and SN74ALS540NSR (Texas Instruments) are functionally equivalent but feature a narrower 20-SOIC package (0.209" width versus 0.295" width). SN74ALS540-1NSR has increased output low current capability (48mA versus 24mA). Both parts are in active production with ROHS3 compliance. These substitutes require PCB layout verification due to package dimension differences.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS540DWR directly replace DM74ALS540AWM without PCB modifications?

A: Yes. SN74ALS540DWR maintains identical package dimensions (20-SOIC, 0.295" width), pin configuration, electrical specifications, and operating parameters. No PCB layout changes are required.

Q: What is the difference between SN74ALS540DW and SN74ALS540DWR?

A: Both parts are electrically identical with the same package and specifications. The primary difference is packaging format: SN74ALS540DW is supplied in tube packaging, while SN74ALS540DWR is supplied in tape and reel format. SN74ALS540DWR is recommended for production environments requiring automated assembly.

Q: Can I use SN74ALS540-1NSR or SN74ALS540NSR as substitutes?

A: These parts are functionally equivalent but feature a narrower package body (0.209" versus 0.295" width). PCB layout verification is required to confirm pad spacing and component placement compatibility. SN74ALS540-1NSR provides higher output low current (48mA), which may affect circuit performance in current-limited applications.

Q: Why is the DM74ALS540AWM classified as obsolete?

A: The part has reached end-of-life status with the manufacturer. Active production alternatives from Texas Instruments (SN74ALS540 series) provide equivalent functionality and are recommended for new designs and production continuity.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All Texas Instruments substitute parts listed (SN74ALS540DW, SN74ALS540DWR, SN74ALS540-1NSR, SN74ALS540NSR) carry ROHS3 compliance certification. The original DM74ALS540AWM RoHS status was not specified in available documentation.