MM74HCT540WMX Equivalent & Substitute Parts

Part Overview

The MM74HCT540WMX is an inverting buffer logic integrated circuit manufactured by onsemi, designed for 8-bit buffering applications with 3-state output capability. This device operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-SOIC surface mount package. The part is currently listed as obsolete, making identification of functionally equivalent alternatives essential for design continuity and procurement planning.

Substiute Parts

MM74HCT540WMX

onsemiIn Stock: 792MM74HCT540WMX Datasheet

Current PartRFQ

SN74HCT540DW

Texas InstrumentsIn Stock: 2207SN74HCT540DW Datasheet

DirectRFQ

SN74HCT540DWR

Texas InstrumentsIn Stock: 15510SN74HCT540DWR Datasheet

DirectRFQ

74HCT540D,653

Nexperia USA Inc.In Stock: 532774HCT540D,653 Datasheet

SimilarRFQ

CD74HCT540M96

Harris CorporationIn Stock: 2947CD74HCT540M96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MM74HCT540WMX is determined by strict alignment with the following electrical and mechanical parameters:

• Logic type and function: Buffer, Inverting configuration
• Bit configuration: 1 element with 8 bits per element
• Output architecture: 3-state output
• Supply voltage range: 4.5V ~ 5.5V
• Package type: 20-SOIC surface mount
• Base product number: 74HCT540

Substitute parts are classified into two categories:

Direct Substitutes maintain identical electrical specifications and packaging, with active or recently discontinued status from major manufacturers.

Similar Substitutes meet all core functional and electrical requirements but may have extended operating temperature ranges, different product status, or alternative packaging formats that remain mechanically compatible with 20-SOIC footprints.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74HCT540DWR (Texas Instruments)

The SN74HCT540DWR is the preferred substitute for the MM74HCT540WMX. This part maintains identical electrical specifications within the 4.5V to 5.5V supply range and -40°C to 85°C operating temperature window. The device is currently active in production status with 15,403 units in stock, ensuring long-term availability. It is supplied in tape and reel format and carries ROHS3 compliance certification. The output current specification of 6mA per line remains within acceptable design margins for most 74HCT logic applications.

Secondary Recommendation: SN74HCT540DW (Texas Instruments)

The SN74HCT540DW provides equivalent electrical performance to the primary recommendation but is listed as discontinued at DiGi Electronics. This part remains suitable for applications where existing inventory is available. It shares identical voltage, temperature, and package specifications with the MM74HCT540WMX.

Alternative Consideration: 74HCT540D,653 (Nexperia USA Inc.)

The 74HCT540D,653 is an active production part manufactured by Nexperia with 5,221 units in stock. This device meets all core functional requirements and operates within the specified 4.5V to 5.5V supply range. The extended operating temperature range of -40°C to 125°C provides additional thermal margin beyond the original specification. ROHS3 compliance is maintained. The 20-SO package designation indicates compatibility with standard 20-SOIC footprints.

Not Recommended: CD74HCT540M96 (Harris Corporation)

The CD74HCT540M96 is obsolete and does not carry ROHS3 compliance certification, making it unsuitable for new designs or applications requiring regulatory compliance documentation.

Frequently Asked Questions (FAQ)

Q: Can the SN74HCT540DWR be used as a direct replacement for the MM74HCT540WMX?

A: Yes. Both devices share identical logic configuration (1 element, 8 bits per element, inverting buffer with 3-state output), supply voltage range (4.5V to 5.5V), operating temperature range (-40°C to 85°C), and 20-SOIC package footprint. The output current specification of 6mA per line on the SN74HCT540DWR is lower than the 7.2mA specification of the MM74HCT540WMX but remains within standard 74HCT logic design margins.

Q: What is the difference between SN74HCT540DW and SN74HCT540DWR?

A: Both parts are electrically identical. The primary difference is packaging format: SN74HCT540DW is supplied in tube packaging, while SN74HCT540DWR is supplied in tape and reel format. The SN74HCT540DWR is currently active in production, whereas the SN74HCT540DW is discontinued at DiGi Electronics.

Q: Does the 74HCT540D,653 from Nexperia have a wider operating temperature range?

A: Yes. The 74HCT540D,653 operates from -40°C to 125°C, compared to the -40°C to 85°C range of the MM74HCT540WMX. This extended range provides additional thermal margin for applications operating in elevated ambient conditions.

Q: Are all substitute parts ROHS3 compliant?

A: Four of the five substitute parts listed carry ROHS3 compliance certification. The CD74HCT540M96 does not meet ROHS3 requirements and should not be selected for applications requiring regulatory compliance documentation.

Q: Is the 20-SOIC package footprint identical across all listed parts?

A: Yes. All substitute parts use the 20-SOIC (0.295", 7.50mm Width) package, ensuring mechanical and electrical compatibility with existing PCB designs. The 74HCT540D,653 is designated as 20-SO but maintains the same physical footprint and pin configuration.