MC74ACT240N Equivalent & Substitute Parts

Part Overview

The MC74ACT240N is a Buffer, Inverting logic IC featuring 2 elements with 4 bits per element and 3-state output capability. Manufactured by onsemi in a 20-PDIP package, this component operates across a 4.5V to 5.5V supply voltage range with output current ratings of 24mA for both high and low states. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Substiute Parts

MC74ACT240N

onsemiIn Stock: 7967MC74ACT240N Datasheet

Current PartRFQ

CD74ACT240E

Harris CorporationIn Stock: 4030CD74ACT240E Datasheet

Parametric EquivalentRFQ

SN74ACT240N

Texas InstrumentsIn Stock: 66079SN74ACT240N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MC74ACT240N are identified based on strict parametric equivalence across the following criteria:

• Logic function: Buffer, Inverting configuration
• Element and bit architecture: 2 elements, 4 bits per element
• Output characteristics: 3-state output capability
• Current specifications: 24mA output drive for both high and low states
• Supply voltage range: 4.5V to 5.5V
• Operating temperature range: -40°C to 85°C
• Physical form factor: 20-DIP through-hole package with 0.300" (7.62mm) pitch
• Base product series: 74ACT logic family

All identified substitutes maintain identical electrical and mechanical specifications within these parameters.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring the MC74ACT240N, the SN74ACT240N manufactured by Texas Instruments is the preferred substitute. This part maintains complete parametric equivalence while offering the advantage of active product status and ROHS3 compliance, supporting long-term availability and regulatory alignment.

The CD74ACT240E from Harris Corporation provides an alternative parametric equivalent with identical electrical and mechanical specifications. However, this part shares obsolete status with the original MC74ACT240N and carries RoHS non-compliant designation.

Selection between available substitutes should prioritize the SN74ACT240N for new designs and ongoing procurement due to its active status and compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can the SN74ACT240N directly replace the MC74ACT240N in existing designs?

A: Yes. The SN74ACT240N is a parametric equivalent with identical logic function, output characteristics, supply voltage range, operating temperature range, and 20-DIP package configuration. Direct substitution is supported without circuit modification.

Q: What is the significance of product status (Active vs. Obsolete)?

A: Active status indicates ongoing manufacturing and supplier support, ensuring long-term availability. Obsolete status indicates discontinued production, which may limit future procurement options and increase lead times or costs.

Q: Does RoHS compliance affect functional compatibility?

A: RoHS compliance does not affect electrical or functional performance. The ROHS3-compliant SN74ACT240N operates identically to the RoHS non-compliant alternatives. Compliance status is relevant for regulatory requirements and supply chain considerations.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the 20-DIP (0.300", 7.62mm) package with identical pinout, enabling direct board-level substitution without layout changes.

Q: What parameters must remain constant for substitution validity?

A: Logic type, element count, bits per element, output type, current ratings, supply voltage range, operating temperature range, and package form factor must all match. The MC74ACT240N, CD74ACT240E, and SN74ACT240N satisfy all these requirements.