74ACT02SCX NOR Gate IC Equivalent & Substitute Parts

Part Overview

The 74ACT02SCX is a 4-channel 2-input NOR gate logic IC manufactured by onsemi in 14-SOIC surface mount packaging. This part is classified as obsolete, which necessitates identification of active alternative components that maintain functional and electrical compatibility for new designs or production continuity.

The 74ACT02 series provides standard logic gating functionality with TTL-compatible input/output levels and is suitable for general-purpose digital logic applications requiring NOR gate operations.

Substiute Parts

74ACT02SCX

onsemiIn Stock: 2787074ACT02SCX Datasheet

Current PartRFQ

MC74ACT02DG

onsemiIn Stock: 1868MC74ACT02DG Datasheet

DirectRFQ

MC74ACT02DR2G

onsemiIn Stock: 2881MC74ACT02DR2G Datasheet

Parametric EquivalentRFQ

74AHCT02D,118

Nexperia USA Inc.In Stock: 315874AHCT02D,118 Datasheet

SimilarRFQ

CD74ACT02M

Harris CorporationIn Stock: 3501CD74ACT02M Datasheet

SimilarRFQ

CD74ACT02M96

Harris CorporationIn Stock: 1591CD74ACT02M96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACT02SCX are categorized based on the following substitution criteria:

Direct Manufacturer Equivalents maintain identical electrical parameters, logic function, package type, and supply voltage range. These parts are pin-compatible and functionally interchangeable without circuit modification.

Parametric Equivalents share the same base product number (74ACT02) and electrical specifications but differ in packaging format (Tape & Reel versus Tube). These are suitable for applications where packaging format does not constrain the design.

Similar Logic Family Alternatives belong to related logic families (74AHCT series) that maintain compatible logic thresholds and pin configurations but may exhibit different electrical characteristics such as propagation delay, quiescent current, or output drive capability. These parts require verification of timing and power consumption requirements within the target application.

Key Parameters for Substitution:

• Logic Type: NOR Gate (4-channel, 2-input)
• Supply Voltage: 4.5V ~ 5.5V
• Package: 14-SOIC surface mount
• Input/Output Logic Levels: TTL-compatible
• Pin Configuration: Identical across all substitutes

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: MC74ACT02DG or MC74ACT02DR2G (onsemi)

Both parts are manufactured by onsemi, the original manufacturer of the 74ACT02SCX, and maintain identical electrical specifications and propagation delay characteristics. Both are active products with ROHS3 compliance. Selection between these two depends on packaging requirements: MC74ACT02DG is supplied in Tube format, while MC74ACT02DR2G is supplied in Tape & Reel format for automated assembly.

Secondary Recommendation: 74AHCT02D,118 (Nexperia USA Inc.)

This part belongs to the 74AHCT logic family and is an active product with ROHS3 compliance. It provides improved performance characteristics including lower quiescent current (2 µA versus 4 µA) and faster propagation delay (7.5ns versus 9.5ns). The extended operating temperature range (-40°C ~ 125°C) provides additional thermal margin. However, output drive capability is reduced (8mA versus 24mA), which must be evaluated against load requirements in the target application.

Not Recommended for New Designs: CD74ACT02M and CD74ACT02M96 (Harris Corporation)

Both parts are obsolete and RoHS non-compliant. While electrically compatible, their obsolete status and lack of RoHS compliance make them unsuitable for new product development or long-term production continuity.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT02DG be used as a direct replacement for 74ACT02SCX?

A: Yes. MC74ACT02DG is a direct functional and electrical equivalent. Both parts share identical logic specifications, supply voltage range, propagation delay, and output drive capability. The primary difference is product status: MC74ACT02DG is active while 74ACT02SCX is obsolete. Packaging format differs (Tube versus unspecified), but this does not affect circuit functionality.

Q: What is the difference between MC74ACT02DG and MC74ACT02DR2G?

A: Both parts are electrically and functionally identical. The difference is packaging format: MC74ACT02DG is supplied in Tube packaging, while MC74ACT02DR2G is supplied in Tape & Reel format. Tape & Reel packaging is standard for automated pick-and-place assembly, while Tube packaging is suitable for manual assembly or lower-volume applications.

Q: Can 74AHCT02D,118 replace 74ACT02SCX in all applications?

A: 74AHCT02D,118 is functionally compatible but exhibits different electrical characteristics. It provides faster propagation delay (7.5ns versus 9.5ns) and lower quiescent current (2 µA versus 4 µA), which are beneficial for power-sensitive applications. However, output drive capability is significantly reduced (8mA versus 24mA). Applications requiring high output current or driving heavy loads must be evaluated to confirm compatibility. The extended operating temperature range (-40°C ~ 125°C) is advantageous for thermal margin.

Q: Why are CD74ACT02M and CD74ACT02M96 not recommended?

A: Both parts are classified as obsolete and are RoHS non-compliant. While they maintain electrical compatibility with 74ACT02SCX, their obsolete status indicates limited future availability. RoHS non-compliance may conflict with regulatory requirements or customer specifications for new product designs.

Q: Are all substitute parts pin-compatible with 74ACT02SCX?

A: Yes. All substitute parts listed maintain the 14-SOIC package configuration and identical pin assignments for NOR gate logic functions. No circuit board modifications are required for substitution.

Q: What packaging options are available for active equivalents?

A: MC74ACT02DG is available in Tube packaging, while MC74ACT02DR2G is available in Tape & Reel format. Selection depends on assembly method and production volume requirements.