74ACT02MTCX NOR Gate IC Equivalent & Substitute Parts

Part Overview

The 74ACT02MTCX is a quad 2-input NOR gate logic IC manufactured by onsemi in a 14-TSSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74ACT02 series provides standard logic gating functionality with 4.5V to 5.5V supply voltage operation and is suitable for digital logic applications requiring NOR gate functionality.

Key Parameters

Parameter	Value
Logic Type	NOR Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	4.5V ~ 5.5V
Current - Quiescent (Max)	4 µA
Current - Output High, Low	24mA, 24mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	9.5ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	14-TSSOP (0.173", 4.40mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ACT02MTCX is determined by the following critical parameters:

Core Functional Requirements:

Logic Type: NOR Gate
Number of Circuits: 4
Number of Inputs: 2
Voltage - Supply: 4.5V ~ 5.5V
Input Logic Levels: Low 0.8V, High 2V

Package Compatibility:

Mounting Type: Surface Mount
Package options: 14-TSSOP or 14-SOIC

Performance Characteristics:

Propagation Delay: Maximum 12.2ns @ 5V, 50pF
Output Current: Minimum 8mA (High and Low)
Quiescent Current: Maximum 4 µA
Operating Temperature: Minimum range -40°C to 85°C

Substitute parts must maintain all core functional parameters. Package variations (14-TSSOP vs. 14-SOIC) are acceptable provided PCB layout accommodates the physical dimensions. Performance parameters may exceed the original specification without affecting compatibility.

Parameter Comparison

Parameter	74ACT02MTCX (Main)	MC74ACT02DTR2G	CD74ACT02M	74AHCT02PW,118
Manufacturer	onsemi	onsemi	Harris Corporation	Nexperia USA Inc.
Logic Type	NOR Gate	NOR Gate	NOR Gate	NOR Gate
Number of Circuits	4	4	4	4
Number of Inputs	2	2	2	2
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent (Max)	4 µA	4 µA	4 µA	2 µA
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	8mA, 8mA
Input Logic Level - Low	0.8V	0.8V	0.8V	0.8V
Input Logic Level - High	2V	2V	2V	2V
Max Propagation Delay @ V, Max CL	9.5ns @ 5V, 50pF	9.5ns @ 5V, 50pF	12.2ns @ 5V, 50pF	7.5ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	14-TSSOP	14-TSSOP	14-SOIC	14-TSSOP
Product Status	Obsolete	Active	Obsolete	Active
RoHS Status	REACH Unaffected	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

MC74ACT02DTR2G (onsemi) is the primary direct substitute. It maintains identical electrical specifications and 14-TSSOP packaging. The part is active in production with ROHS3 compliance, providing long-term availability and regulatory alignment.

74AHCT02PW,118 (Nexperia USA Inc.) is a functional equivalent with enhanced performance characteristics. It offers lower quiescent current (2 µA vs. 4 µA), faster propagation delay (7.5ns vs. 9.5ns), and extended upper operating temperature (125°C vs. 85°C). Output current is reduced to 8mA, which is acceptable for most logic-level applications. The part is active and ROHS3 compliant. Package is identical 14-TSSOP.

CD74ACT02M (Harris Corporation) is functionally compatible but presents limitations. The part is obsolete with RoHS non-compliance. Package differs as 14-SOIC, requiring PCB layout modification. Propagation delay is slightly degraded at 12.2ns. This option is suitable only when 14-SOIC package is preferred and RoHS compliance is not required.

For new designs and ongoing procurement, MC74ACT02DTR2G or 74AHCT02PW,118 are recommended based on active production status and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT02DTR2G directly replace 74ACT02MTCX without circuit modification?

A: Yes. MC74ACT02DTR2G maintains identical electrical specifications, logic function, supply voltage, input/output levels, and 14-TSSOP package dimensions. No circuit modification is required.

Q: What is the difference between 74ACT02 and 74AHCT02 series?

A: Both are quad 2-input NOR gates with identical logic function and pin configuration. The 74AHCT02 series offers improved performance with lower quiescent current and faster propagation delay. The 74AHCT02PW,118 is suitable as a drop-in replacement where enhanced performance is beneficial.

Q: Can CD74ACT02M be used as a substitute despite the 14-SOIC package?

A: CD74ACT02M is functionally compatible but requires PCB layout modification due to 14-SOIC package versus 14-TSSOP. The part is obsolete and RoHS non-compliant. Use only if 14-SOIC package is required and regulatory compliance is not a constraint.

Q: What is the impact of reduced output current in 74AHCT02PW,118?

A: The 74AHCT02PW,118 provides 8mA output current versus 24mA in the original part. This is sufficient for standard logic-level signal distribution. Applications requiring high current drive should retain the original 24mA specification.

Q: Are all substitute parts MSL Level 1?

A: MC74ACT02DTR2G and 74AHCT02PW,118 are both MSL Level 1 (Unlimited). CD74ACT02M MSL rating is not specified in available data.

Q: Which substitute offers the best long-term availability?

A: MC74ACT02DTR2G and 74AHCT02PW,118 are both active production parts with ROHS3 compliance, ensuring long-term availability and regulatory alignment. Both are preferred over obsolete alternatives.

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