CD74AC240EE4 Equivalent & Substitute Parts

Part Overview

The CD74AC240EE4 is an 8-channel inverting buffer logic integrated circuit manufactured by Texas Instruments. This device functions as a 2-element, 4-bit-per-element inverter with 3-state output capability, designed for digital logic applications requiring signal inversion and buffering across a 1.5V to 5.5V supply voltage range. The part is currently in active production status with 913 pieces available in new original inventory. Substitute parts are necessary when the primary manufacturer part becomes unavailable, when alternative sourcing is required for supply chain optimization, or when design flexibility demands component alternatives that maintain identical electrical and mechanical specifications.

Substiute Parts

CD74AC240EE4

Texas InstrumentsIn Stock: 1020CD74AC240EE4 Datasheet

Current PartRFQ

CD74AC240E

Harris CorporationIn Stock: 2264CD74AC240E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CD74AC240EE4 is determined by strict equivalence across the following critical parameters: logic type (Buffer, Inverting), number of elements (2), bits per element (4), output configuration (3-State), output current specifications (24mA high and low), supply voltage range (1.5V ~ 5.5V), operating temperature range (-40°C ~ 85°C), package type (20-DIP), and mounting method (Through Hole). All substitute parts must match these specifications exactly to ensure functional and mechanical compatibility within the target application circuit. The 74AC series designation indicates the logic family classification, which must remain consistent across all equivalent parts.

Parameter Comparison

Engineering Selection Recommendations

The CD74AC240EE4 manufactured by Texas Instruments is the primary selection for new designs and applications requiring active product status with full RoHS3 compliance. This part maintains current production support and meets modern environmental and regulatory standards.

The CD74AC240E manufactured by Harris Corporation is electrically and mechanically equivalent across all functional parameters. However, this part carries obsolete product status and does not meet RoHS3 compliance requirements. Selection of the CD74AC240E is appropriate only in legacy system maintenance scenarios where component replacement must match existing installed base specifications, or in applications where RoHS compliance is not a design requirement. The CD74AC240E remains suitable for functional substitution in through-hole PCB applications where the 20-DIP package footprint and electrical characteristics are the primary selection criteria.

Frequently Asked Questions (FAQ)

Q: Can the CD74AC240E be used as a direct replacement for the CD74AC240EE4 in new designs?

A: The CD74AC240E is electrically and mechanically equivalent to the CD74AC240EE4 across all functional parameters. However, the CD74AC240E carries obsolete product status and does not meet RoHS3 compliance. For new designs, the CD74AC240EE4 is the appropriate selection due to active production status and regulatory compliance.

Q: What are the critical parameters that determine substitution compatibility?

A: Substitution compatibility is determined by exact equivalence in logic type (Buffer, Inverting), element count (2), bits per element (4), output configuration (3-State), output current (24mA high and low), supply voltage range (1.5V ~ 5.5V), operating temperature range (-40°C ~ 85°C), package type (20-DIP), and mounting method (Through Hole).

Q: Are there any package or footprint differences between the CD74AC240EE4 and CD74AC240E?

A: Both parts use identical 20-DIP (0.300", 7.62mm) through-hole packaging. PCB footprints and mounting requirements are identical, allowing direct physical substitution on existing circuit boards.

Q: What is the significance of the RoHS compliance difference?

A: The CD74AC240EE4 is RoHS3 compliant, meeting current environmental and regulatory standards for electronic components. The CD74AC240E is RoHS non-compliant. RoHS compliance is mandatory for applications subject to EU regulations or customer specifications requiring environmental compliance certification.

Q: Can the CD74AC240E be used in legacy system repairs?

A: Yes. The CD74AC240E is suitable for maintenance and repair of existing systems where the original installed component was the CD74AC240E or equivalent non-compliant part. Functional compatibility is maintained across all electrical and mechanical specifications.