CD74AC540M Equivalent & Substitute Parts

Part Overview

The CD74AC540M is a Buffer, Inverting logic IC manufactured by Texas Instruments in a 20-SOIC surface mount package. This device functions as a 1-element, 8-bit inverting buffer with 3-state output capability, operating across a supply voltage range of 1.5V to 5.5V. The CD74AC540M is designated as Last Time Buy, indicating end-of-life status. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain component availability for production and maintenance applications.

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	24mA, 24mA
Voltage - Supply	1.5V ~ 5.5V
Operating Temperature	-55°C ~ 125°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the CD74AC540M are qualified based on the following criteria:

Functional Equivalence: All substitute parts maintain identical logic type (Buffer, Inverting), element count (1), bit width (8), and output configuration (3-State).

Electrical Compatibility: All substitutes provide the same output current specifications (24mA, 24mA) and are packaged in the identical 20-SOIC form factor.

Package Compatibility: All substitute parts use the same 20-SOIC (0.295", 7.50mm Width) surface mount package, ensuring mechanical and electrical compatibility on existing PCBs.

Voltage and Temperature Ranges: Substitutes operate within the specified voltage supply range and temperature operating window, with some variants offering extended or alternative ranges.

The CD74AC540M96 (Texas Instruments, Tape & Reel packaging) is the manufacturer-recommended direct substitute, maintaining identical electrical specifications and active product status. The onsemi variants (74AC540SCX, MC74AC540DWG, MC74AC540DWR2G) provide functional equivalence with alternative packaging options and active product status.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Output Current (mA)	Voltage Supply (V)	Operating Temp (°C)	Package	Packaging Type	Product Status	RoHS Status
CD74AC540M	Texas Instruments	Buffer, Inverting	24, 24	1.5 ~ 5.5	-55 ~ 125	20-SOIC	Tube	Last Time Buy	ROHS3 Compliant
CD74AC540M96	Texas Instruments	Buffer, Inverting	24, 24	1.5 ~ 5.5	-55 ~ 125	20-SOIC	Tape & Reel	Active	ROHS3 Compliant
74AC540SCX	onsemi	Buffer, Inverting	24, 24	2 ~ 6	-40 ~ 85	20-SOIC	Tape & Reel	Active	ROHS3 Compliant
MC74AC540DWG	onsemi	Buffer, Inverting	24, 24	2 ~ 6	-40 ~ 85	20-SOIC	Tube	Active	ROHS3 Compliant
MC74AC540DWR2G	onsemi	Buffer, Inverting	24, 24	2 ~ 6	-40 ~ 85	20-SOIC	Tape & Reel	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: CD74AC540M96 (Texas Instruments) is the recommended substitute for the CD74AC540M. This part maintains identical electrical specifications, operates across the full voltage and temperature range of the original, and carries Active product status, ensuring long-term availability and supply chain stability.

Alternative Substitutes: The onsemi variants (74AC540SCX, MC74AC540DWG, MC74AC540DWR2G) provide functional equivalence with Active product status. These parts operate within a narrower voltage range (2V ~ 6V) and reduced temperature range (-40°C ~ 85°C) compared to the CD74AC540M. Selection of onsemi variants is appropriate for applications operating within these specified ranges.

Packaging Considerations: The CD74AC540M96 is available in Tape & Reel packaging, suitable for automated assembly processes. The MC74AC540DWG is available in Tube packaging for manual assembly or lower-volume applications. The 74AC540SCX and MC74AC540DWR2G are available in Tape & Reel packaging.

Compliance: All substitute parts maintain ROHS3 compliance and REACH Unaffected status, consistent with the original CD74AC540M.

Frequently Asked Questions (FAQ)

Q: Can the CD74AC540M96 be used as a direct replacement for the CD74AC540M?

A: Yes. The CD74AC540M96 is electrically and mechanically identical to the CD74AC540M, with the primary difference being packaging format (Tape & Reel versus Tube) and active product status. Both parts operate across 1.5V to 5.5V supply voltage and -55°C to 125°C temperature range.

Q: What are the key differences between Texas Instruments and onsemi variants?

A: The onsemi variants (74AC540SCX, MC74AC540DWG, MC74AC540DWR2G) operate within a narrower voltage range (2V ~ 6V) and reduced temperature range (-40°C ~ 85°C). All variants maintain identical output current specifications (24mA, 24mA) and 20-SOIC package dimensions.

Q: Are all substitute parts compatible with existing PCB designs?

A: Yes. All substitute parts use the identical 20-SOIC (0.295", 7.50mm Width) surface mount package, ensuring mechanical and electrical compatibility on existing printed circuit boards.

Q: What packaging options are available for substitutes?

A: CD74AC540M96 is available in Tape & Reel packaging. MC74AC540DWG is available in Tube packaging. 74AC540SCX and MC74AC540DWR2G are available in Tape & Reel packaging. Selection depends on assembly process requirements and volume considerations.

Q: Do all substitute parts meet RoHS compliance requirements?

A: Yes. All substitute parts listed are ROHS3 Compliant and REACH Unaffected, maintaining regulatory compliance consistent with the original CD74AC540M.

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