DM74ALS540AWMX Equivalent & Substitute Parts

Part Overview

The DM74ALS540AWMX is a Buffer, Inverting logic IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability. Designed for 4.5V to 5.5V supply operation with 20-SOIC surface mount packaging, this component is classified as obsolete. Due to its discontinued status, identifying functionally equivalent substitute parts from active manufacturers is essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Logic Type	Buffer, Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High, Low	15mA, 24mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Series	74ALS
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the DM74ALS540AWMX are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes (Identical Specifications): Parts that maintain all critical electrical parameters and package dimensions. These parts are pin-compatible and functionally equivalent with no design modifications required.

Similar Substitutes (Package Variant): Parts that maintain all critical electrical parameters but feature alternative package dimensions. These parts require PCB layout evaluation due to different physical footprints.

The substitution logic is strictly based on the following parameters:

Logic Type: Buffer, Inverting
Number of Elements: 1
Number of Bits per Element: 8
Output Type: 3-State
Voltage - Supply: 4.5V ~ 5.5V
Operating Temperature: 0°C ~ 70°C (TA)
Mounting Type: Surface Mount
Series: 74ALS

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current High/Low (mA)	Supply Voltage	Temp Range	Package	Package Width	Product Status
DM74ALS540AWMX	onsemi	Buffer, Inverting	1	8	3-State	15, 24	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC	0.295" (7.50mm)	Obsolete
SN74ALS540DW	Texas Instruments	Buffer, Inverting	1	8	3-State	15, 24	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC	0.295" (7.50mm)	Last Time Buy
SN74ALS540DWR	Texas Instruments	Buffer, Inverting	1	8	3-State	15, 24	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC	0.295" (7.50mm)	Active
SN74ALS540-1NSR	Texas Instruments	Buffer, Inverting	1	8	3-State	15, 48	4.5V ~ 5.5V	0°C ~ 70°C	20-SO	0.209" (5.30mm)	Active
SN74ALS540NSR	Texas Instruments	Buffer, Inverting	1	8	3-State	15, 24	4.5V ~ 5.5V	0°C ~ 70°C	20-SO	0.209" (5.30mm)	Active

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement: SN74ALS540DWR is the primary recommended substitute. Manufactured by Texas Instruments with Active product status, this part maintains identical electrical specifications and package dimensions (20-SOIC, 0.295" width) to the DM74ALS540AWMX. ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) support modern manufacturing and storage requirements.

For Last-Time-Buy Scenarios: SN74ALS540DW offers identical electrical and mechanical specifications to the DM74ALS540AWMX but carries Last Time Buy status. This part is suitable only for applications where long-term availability is not a requirement.

For Package Variant Applications: SN74ALS540-1NSR and SN74ALS540NSR are functionally equivalent alternatives with different package dimensions (20-SO, 0.209" width). Both parts maintain Active product status. SN74ALS540-1NSR features increased output low current (48mA vs. 24mA), while SN74ALS540NSR maintains the original 24mA specification. These parts require PCB layout modification due to narrower package width.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS540DWR be used as a direct replacement for DM74ALS540AWMX without PCB modifications? A: Yes. SN74ALS540DWR is electrically and mechanically identical, maintaining the same 20-SOIC package dimensions (0.295" width), pin configuration, and electrical specifications. No design changes are required.

Q: What is the difference between SN74ALS540DW and SN74ALS540DWR? A: Both parts are identical in electrical specifications and package dimensions. The primary difference is packaging format: SN74ALS540DW is supplied in Tube packaging, while SN74ALS540DWR is supplied in Tape & Reel (TR) format. SN74ALS540DWR also carries Active product status compared to Last Time Buy for SN74ALS540DW.

Q: Can SN74ALS540-1NSR or SN74ALS540NSR be used as substitutes? A: These parts are functionally equivalent but feature a narrower package (20-SO, 0.209" width vs. 0.295" width). PCB layout evaluation is required to confirm footprint compatibility. SN74ALS540-1NSR has higher output low current (48mA), while SN74ALS540NSR maintains the original 24mA specification.

Q: Are all substitute parts ROHS3 compliant? A: SN74ALS540DW, SN74ALS540DWR, SN74ALS540-1NSR, and SN74ALS540NSR are all ROHS3 compliant. The original DM74ALS540AWMX does not specify ROHS status.

Q: What is the moisture sensitivity level (MSL) for these parts? A: All parts, including the original DM74ALS540AWMX and all substitutes, have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage and handling.

Q: Which substitute part should be selected for new designs? A: SN74ALS540DWR is the recommended choice for new designs, offering Active product status, ROHS3 compliance, identical electrical and mechanical specifications, and Tape & Reel packaging suitable for automated assembly.

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