CD74ACT540MG4 Equivalent & Substitute Parts

Part Overview

The CD74ACT540MG4 is a Buffer, Inverting logic IC manufactured by Texas Instruments, designed for 5.5V operation with 1 element and 8 bits per element in a 20-SOIC package. This part is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design requirements and production needs. The 74ACT540 series provides 3-state output capability with 24mA output current capacity, suitable for bus-oriented applications requiring signal inversion and buffering.

Substiute Parts

CD74ACT540MG4

Texas InstrumentsIn Stock: 961CD74ACT540MG4 Datasheet

Current PartRFQ

CD74ACT540M

Texas InstrumentsIn Stock: 89995CD74ACT540M Datasheet

MFR RecommendedRFQ

MC74ACT540DWG

onsemiIn Stock: 1084MC74ACT540DWG Datasheet

MFR RecommendedRFQ

MC74ACT540DWR2G

onsemiIn Stock: 1648MC74ACT540DWR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CD74ACT540MG4 is determined by strict equivalence across the following critical parameters:

• Logic Type: Buffer, Inverting (identical function)
• Number of Elements: 1 (identical configuration)
• Number of Bits per Element: 8 (identical bit width)
• Output Type: 3-State (identical output capability)
• Current - Output High, Low: 24mA, 24mA (identical drive capability)
• Voltage - Supply: 4.5V ~ 5.5V (identical supply range)
• Package / Case: 20-SOIC (identical physical footprint)
• Mounting Type: Surface Mount (identical assembly method)

All substitute parts listed maintain these core electrical and mechanical specifications, ensuring functional and physical compatibility with the original CD74ACT540MG4 design.

Parameter Comparison

Engineering Selection Recommendations

CD74ACT540M (Texas Instruments): This part is the manufacturer-recommended substitute from Texas Instruments. It maintains identical electrical specifications and operating temperature range (-55°C ~ 125°C) as the original CD74ACT540MG4. Both parts are discontinued at DiGi Electronics but share the same base product number (74ACT540) and ROHS3 compliance. The primary difference is packaging format (Tube vs. unspecified). This substitute is optimal for applications requiring the extended temperature range of the original specification.

MC74ACT540DWG (onsemi): This onsemi alternative maintains all critical electrical parameters and 20-SOIC package compatibility. The part is currently active in production. The operating temperature range is narrower (-40°C ~ 85°C) compared to the original. Moisture sensitivity level is MSL 3 (168 Hours) versus MSL 1 (Unlimited) for the original. This substitute is suitable for standard commercial temperature applications where the reduced temperature range and moisture sensitivity are acceptable.

MC74ACT540DWR2G (onsemi): This onsemi variant is functionally identical to MC74ACT540DWG but supplied in Tape & Reel (TR) packaging format instead of Tube. It maintains the same electrical specifications, active product status, and operating temperature range (-40°C ~ 85°C). This substitute is appropriate for high-volume production environments where tape and reel packaging is preferred for automated assembly.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT540DWG or MC74ACT540DWR2G be used as direct replacements for CD74ACT540MG4 in all applications?

A: Both onsemi parts are electrically compatible for the core 74ACT540 function. However, the operating temperature range differs: onsemi parts operate from -40°C ~ 85°C, while the original operates from -55°C ~ 125°C. Applications requiring operation below -40°C or above 85°C must use CD74ACT540M or equivalent Texas Instruments parts. All other electrical parameters (voltage supply, output current, logic function) are identical.

Q: What is the difference between MC74ACT540DWG and MC74ACT540DWR2G?

A: Both parts are electrically and functionally identical. The only difference is packaging format: MC74ACT540DWG is supplied in Tube packaging, while MC74ACT540DWR2G is supplied in Tape & Reel (TR) format. Selection depends on assembly method and volume requirements. Tape & Reel is standard for automated pick-and-place assembly, while Tube packaging is used for manual or lower-volume applications.

Q: Why does the original CD74ACT540MG4 show as discontinued?

A: The CD74ACT540MG4 is discontinued at DiGi Electronics, but the base product number 74ACT540 remains available through multiple manufacturers. CD74ACT540M (Texas Instruments) and MC74ACT540DWG/MC74ACT540DWR2G (onsemi) provide continued access to this logic function with identical core specifications.

Q: Are there moisture sensitivity differences between the substitutes?

A: Yes. CD74ACT540MG4 and CD74ACT540M have MSL 1 (Unlimited moisture sensitivity), while MC74ACT540DWG and MC74ACT540DWR2G have MSL 3 (168 Hours). MSL 3 parts require controlled storage conditions and have a 168-hour floor life after moisture exposure. Applications in high-humidity environments or with extended storage periods should prioritize MSL 1 parts.

Q: Is the 20-SOIC package identical across all substitutes?

A: Yes. All substitute parts use the 20-SOIC package with 0.295" width (7.50mm). Physical footprint, pin count, and PCB layout compatibility are identical across CD74ACT540MG4, CD74ACT540M, MC74ACT540DWG, and MC74ACT540DWR2G.