74AC02SJ NOR Gate IC Equivalent & Substitute Parts

Part Overview

The 74AC02SJ is a 4-channel 2-input NOR gate logic IC manufactured by onsemi in 14-SOP surface mount packaging. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The 74AC series represents a standard logic family with widespread industrial application in digital circuit design.

Substiute Parts

74AC02SJ

onsemiIn Stock: 111374AC02SJ Datasheet

Current PartRFQ

CD74AC02M

Harris CorporationIn Stock: 2035CD74AC02M Datasheet

SimilarRFQ

CD74AC02M96

Texas InstrumentsIn Stock: 6034CD74AC02M96 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74AC02SJ is determined by the following critical parameters:

• Logic Function: All substitute parts must implement 4-channel 2-input NOR gate logic
• Circuit Count & Input Configuration: 4 circuits with 2 inputs per circuit
• Output Drive Capability: 24mA output current (high and low)
• Package Compatibility: 14-pin SOIC surface mount packaging
• Supply Voltage Range: Minimum 1.5V to 5.5V compatibility required
• Base Series: 74AC logic family

The identified substitute parts CD74AC02M and CD74AC02M96 meet these core substitution criteria while maintaining functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

CD74AC02M96 (Texas Instruments) is the preferred substitute for new designs and production applications. This part is currently active in production status, ensuring long-term availability and supply chain stability. It carries ROHS3 compliance certification, meeting modern environmental and regulatory requirements. The extended operating temperature range (-55°C to 125°C) provides broader application flexibility compared to the original 74AC02SJ.

CD74AC02M (Harris Corporation) functions as a secondary substitute option. While functionally equivalent, this part shares obsolete status with the original component, limiting its suitability for long-term production planning. RoHS non-compliance may restrict use in applications subject to environmental regulations.

Both substitute parts maintain functional equivalence through identical logic configuration, output drive capability, and core electrical characteristics. The primary trade-off involves propagation delay: substitute parts exhibit 11.5ns maximum delay compared to 6.5ns for the original part. This difference is acceptable in most general-purpose logic applications but should be evaluated in timing-critical circuits.

Frequently Asked Questions (FAQ)

Q: Can CD74AC02M96 directly replace 74AC02SJ in existing designs?

A: Yes, from a functional logic perspective. Both parts implement 4-channel 2-input NOR gate logic with identical output drive capability (24mA). However, physical package dimensions differ: the original uses 14-SOIC (0.209", 5.30mm width) while the substitute uses 14-SOIC (0.154", 3.90mm width). PCB layout and footprint compatibility must be verified before substitution.

Q: What is the significance of the propagation delay difference?

A: The 74AC02SJ specifies 6.5ns maximum propagation delay while substitutes specify 11.5ns. For general logic applications, this difference is typically negligible. In high-speed or timing-critical circuits, the slower propagation delay of substitute parts may require circuit timing analysis to confirm acceptable performance.

Q: Why is CD74AC02M96 preferred over CD74AC02M?

A: CD74AC02M96 maintains active production status, ensuring reliable long-term availability. It also carries ROHS3 compliance certification, meeting current environmental standards. CD74AC02M is obsolete and RoHS non-compliant, making it unsuitable for new production designs subject to regulatory requirements.

Q: Are there supply voltage compatibility concerns?

A: The original 74AC02SJ operates at 2V ~ 6V supply voltage. Substitutes operate at 1.5V ~ 5.5V. The lower minimum voltage (1.5V vs 2V) is not a limitation. Designs operating at the original 2V ~ 5.5V range are fully compatible with substitute parts.

Q: What packaging considerations apply to substitution?

A: Both substitute parts use 14-SOIC surface mount packaging, maintaining compatibility with standard SMD assembly processes. Physical package dimensions differ slightly (0.154" vs 0.209" width), requiring PCB footprint verification. Pin configuration and spacing remain identical across all three parts.