MC74ACT540MEL Equivalent & Substitute Parts

Part Overview

The MC74ACT540MEL is a Buffer, Inverting logic IC with 1 element and 8 bits per element, featuring 3-state output capability. Manufactured by onsemi in a 20-SOIC package, this component operates at 4.5V to 5.5V supply voltage with 24mA output current capability. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Substiute Parts

MC74ACT540MEL

onsemiIn Stock: 895MC74ACT540MEL Datasheet

Current PartRFQ

CD74ACT540M

Texas InstrumentsIn Stock: 89995CD74ACT540M Datasheet

SimilarRFQ

CD74ACT540M96

Texas InstrumentsIn Stock: 1574CD74ACT540M96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the MC74ACT540MEL is determined by the following critical parameters:

• Logic Type: Buffer, Inverting (functional equivalence)
• Number of Elements: 1 and Number of Bits per Element: 8 (pin count and functionality)
• Output Type: 3-State (output configuration)
• Current - Output High, Low: 24mA, 24mA (drive capability)
• Voltage - Supply: 4.5V ~ 5.5V (power supply compatibility)
• Series: 74ACT (logic family)
• Package / Case: 20-SOIC (physical footprint)

The identified substitute parts CD74ACT540M and CD74ACT540M96 (both from Texas Instruments) meet all functional and electrical requirements. Both maintain the same logic type, element count, bit configuration, output type, current ratings, and supply voltage specifications. Package dimensions differ slightly (0.295" vs 0.209" width), but both are 20-SOIC form factors suitable for surface mount applications.

Parameter Comparison

Engineering Selection Recommendations

CD74ACT540M96 is the primary substitute for new designs and production. This part is currently active in the market, offers ROHS3 compliance, and provides superior moisture sensitivity characteristics (MSL 1 vs MSL 3). The extended operating temperature range (-55°C to 125°C) exceeds the original specification, providing additional design margin.

CD74ACT540M serves as a secondary option where availability of the M96 variant is constrained. This part is discontinued at DiGi Electronics but maintains ROHS3 compliance and identical electrical specifications to CD74ACT540M96.

Both Texas Instruments substitutes are electrically and functionally equivalent to the MC74ACT540MEL. The primary design consideration is package width tolerance (0.295" vs 0.209"), which must be verified against PCB layout constraints before implementation.

Frequently Asked Questions (FAQ)

Q: Are CD74ACT540M and CD74ACT540M96 pin-compatible with MC74ACT540MEL?

A: Yes. Both substitute parts maintain identical pin configuration and 20-SOIC package type. Pin-to-pin compatibility is confirmed across all functional and power pins.

Q: What is the difference between CD74ACT540M and CD74ACT540M96?

A: Both parts are electrically identical with the same logic function, output current, and supply voltage specifications. The primary difference is product status: CD74ACT540M96 is active in production, while CD74ACT540M is discontinued at DiGi Electronics. CD74ACT540M96 is the recommended choice for new designs.

Q: Can I use these substitutes in applications requiring RoHS compliance?

A: Yes. Both CD74ACT540M and CD74ACT540M96 are ROHS3 compliant, unlike the original MC74ACT540MEL which is RoHS non-compliant. This makes the substitutes suitable for applications with RoHS requirements.

Q: How do the operating temperature ranges compare?

A: The MC74ACT540MEL operates from -40°C to 85°C. Both Texas Instruments substitutes operate from -55°C to 125°C, providing a wider temperature range suitable for extended industrial and military applications.

Q: Are there package size differences I should consider?

A: Yes. The MC74ACT540MEL uses a 20-SOIC package with 0.209" width, while both substitute parts use 20-SOIC with 0.295" width. Verify PCB layout and footprint compatibility before design implementation.

Q: What is the moisture sensitivity difference?

A: The MC74ACT540MEL has MSL 3 (168 hours), while both substitutes have MSL 1 (unlimited). This means the substitutes have superior moisture resistance and less stringent storage and handling requirements.