MC74ACT02N NOR Gate IC Equivalent & Substitute Parts

Part Overview

The MC74ACT02N is a 4-channel, 2-input NOR gate logic IC manufactured by onsemi in a 14-PDIP through-hole package. This component implements basic NOR logic functions and operates within the 4.5V to 5.5V supply voltage range. The product is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system maintenance, repair, and legacy design support.

Substiute Parts

MC74ACT02N

onsemiIn Stock: 880MC74ACT02N Datasheet

Current PartRFQ

CD74ACT02E

Harris CorporationIn Stock: 5584CD74ACT02E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MC74ACT02N is determined by strict equivalence across the following critical parameters:

• Logic function: 4-channel, 2-input NOR gate
• Supply voltage range: 4.5V ~ 5.5V
• Output drive capability: 24mA high and low
• Input logic thresholds: 0.8V low, 2V high
• Package type: 14-DIP through-hole form factor
• Base product series: 74ACT logic family

The CD74ACT02E, manufactured by Harris Corporation, meets all these criteria and is therefore a direct functional equivalent. Both parts implement identical logic architecture within the same package and voltage specifications, enabling pin-for-pin substitution in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Both the MC74ACT02N and CD74ACT02E are classified as obsolete products. Selection between these parts should be based on the following factors:

Propagation Delay: The MC74ACT02N exhibits a maximum propagation delay of 9.5ns at 5V with 50pF load, while the CD74ACT02E specifies 12.2ns under identical conditions. Applications with timing-critical signal paths may require the faster MC74ACT02N.

Operating Temperature Range: The CD74ACT02E supports an extended temperature range of -55°C to 125°C compared to the MC74ACT02N range of -40°C to 85°C. Systems operating in extreme thermal environments may benefit from the CD74ACT02E.

Compliance Status: Both parts carry identical RoHS non-compliant and REACH unaffected designations. Neither part meets modern environmental compliance standards.

Availability and Packaging: The CD74ACT02E is supplied in tube packaging with higher inventory availability (5523 units) compared to the MC74ACT02N (855 units). For high-volume applications, the CD74ACT02E may offer better procurement flexibility.

Frequently Asked Questions (FAQ)

Q: Can the CD74ACT02E directly replace the MC74ACT02N in existing circuits?

A: Yes. Both parts are pin-for-pin compatible 14-DIP packages with identical logic function, supply voltage range, input/output specifications, and quiescent current ratings. Direct substitution is electrically valid.

Q: What is the difference in propagation delay between these parts?

A: The MC74ACT02N specifies 9.5ns maximum propagation delay at 5V with 50pF load, while the CD74ACT02E specifies 12.2ns under the same conditions. The difference is 2.7ns. Applications with timing margins below this threshold require verification.

Q: Are there temperature range considerations for substitution?

A: The CD74ACT02E operates from -55°C to 125°C, while the MC74ACT02N operates from -40°C to 85°C. If your application requires operation below -40°C or above 85°C, the CD74ACT02E provides extended capability.

Q: Do both parts meet current RoHS compliance requirements?

A: No. Both the MC74ACT02N and CD74ACT02E are classified as RoHS non-compliant. Neither part is suitable for new designs requiring RoHS certification.

Q: What packaging formats are available for these substitute parts?

A: Both parts are supplied in 14-DIP through-hole packages with 0.300" (7.62mm) pitch. The MC74ACT02N is available in standard packaging, while the CD74ACT02E is supplied in tube packaging.

Q: Are there any differences in quiescent current or output drive capability?

A: No. Both parts specify identical quiescent current of 4 µA maximum and output drive capability of 24mA for both high and low states.