74AC02SCX NOR Gate IC Equivalent & Substitute Parts

Part Overview

The 74AC02SCX 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, making substitute parts necessary for new designs and ongoing production requirements. The 74AC02 series provides standard logic gating functionality across a wide supply voltage range of 2V to 6V, with symmetric output drive capability and low quiescent current consumption.

Substiute Parts

74AC02SCX

onsemiIn Stock: 345274AC02SCX Datasheet

Current PartRFQ

MC74AC02DG

onsemiIn Stock: 4946MC74AC02DG Datasheet

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MC74AC02DR2G

onsemiIn Stock: 4250MC74AC02DR2G Datasheet

Parametric EquivalentRFQ

74AHC02D,118

NXP USA Inc.In Stock: 1177874AHC02D,118 Datasheet

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CD74AC02M

Harris CorporationIn Stock: 2035CD74AC02M Datasheet

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CD74AC02M96

Texas InstrumentsIn Stock: 6034CD74AC02M96 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74AC02SCX is determined by the following critical parameters:

Functional Equivalence: All substitute parts maintain identical logic configuration (4-channel 2-input NOR gate) and pin-compatible 14-SOIC packaging.

Electrical Compatibility: Substitute parts must operate within overlapping supply voltage ranges and maintain compatible input/output logic levels. The 74AC02SCX operates at 2V ~ 6V supply; substitutes with 1.5V ~ 5.5V or 2V ~ 5.5V ranges are electrically compatible within the 2V ~ 5.5V overlap window.

Performance Parameters: Propagation delay and output drive current are critical for timing-sensitive applications. Parts with equal or superior (lower) propagation delay and equal or greater output drive capability are functionally equivalent.

Package Compatibility: All substitutes use 14-SOIC surface mount packaging with identical physical dimensions, ensuring PCB layout compatibility.

Product Status Consideration: Active status parts are preferred for new designs; obsolete parts are suitable only for legacy system maintenance.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility)

MC74AC02DG and MC74AC02DR2G from onsemi are direct functional equivalents with identical electrical specifications to the 74AC02SCX. Both parts are active status, ensuring long-term availability. MC74AC02DG is supplied in tube packaging; MC74AC02DR2G is supplied in tape and reel format for automated assembly. Both are ROHS3 compliant.

Secondary Substitutes (Compatible with Parameter Variance)

CD74AC02M96 from Texas Instruments is an active status part with identical output drive capability (24mA) and propagation delay (11.5ns at 5V, 50pF) to the 74AC02SCX. This part offers extended operating temperature range (-55°C ~ 125°C) and lower minimum supply voltage (1.5V). ROHS3 compliance is confirmed. The slightly slower propagation delay (11.5ns vs. 6.5ns) is acceptable for non-critical timing applications.

Alternative Logic Family

74AHC02D,118 from NXP USA Inc. is an active status part using the 74AHC logic family. This part maintains 4-channel 2-input NOR gate functionality and 14-SOIC packaging. Output drive capability is reduced to 8mA per channel, and propagation delay is 7.5ns at 5V, 50pF. Supply voltage range is 2V ~ 5.5V. This part is suitable for applications where reduced output drive is acceptable and extended temperature operation (-40°C ~ 125°C) is required.

Obsolete Parts (Legacy Applications Only)

CD74AC02M from Harris Corporation is obsolete status and RoHS non-compliant. This part is suitable only for maintenance of existing systems and should not be used in new designs.

Frequently Asked Questions (FAQ)

Q: Can MC74AC02DG directly replace 74AC02SCX in existing designs?

A: Yes. MC74AC02DG is a direct functional equivalent with identical logic configuration, electrical specifications, and 14-SOIC packaging. The primary difference is packaging format (tube vs. unspecified) and active product status, which ensures continued availability.

Q: What is the difference between MC74AC02DG and MC74AC02DR2G?

A: Both parts are electrically identical. The difference is packaging format: MC74AC02DG is supplied in tube packaging for manual handling; MC74AC02DR2G is supplied in tape and reel format for automated pick-and-place assembly. Selection depends on assembly process requirements.

Q: Can CD74AC02M96 be used as a substitute despite slower propagation delay?

A: CD74AC02M96 has 11.5ns propagation delay compared to 6.5ns for the 74AC02SCX. This part is suitable for applications where timing margins are not critical. For timing-sensitive circuits, the faster onsemi parts (MC74AC02DG or MC74AC02DR2G) are recommended.

Q: Is 74AHC02D,118 compatible with 74AC02SCX?

A: 74AHC02D,118 maintains identical logic function and 14-SOIC packaging but uses a different logic family (74AHC vs. 74AC). Output drive is reduced to 8mA per channel. This part is compatible for applications where reduced output drive is acceptable. Supply voltage overlap is 2V ~ 5.5V.

Q: What are the packaging considerations for substitute selection?

A: All substitute parts use 14-SOIC surface mount packaging with identical physical dimensions (0.154" width, 3.90mm). Packaging format differences (tube, tape and reel, cut tape) affect handling and assembly process but not PCB compatibility. Select based on assembly equipment capability.

Q: Are all substitute parts RoHS compliant?

A: MC74AC02DG, MC74AC02DR2G, and CD74AC02M96 are ROHS3 compliant. CD74AC02M is RoHS non-compliant and should not be used in new designs subject to RoHS requirements. 74AHC02D,118 RoHS status is not specified in available data.