74ACTQ02SCX NOR Gate IC Equivalent & Substitute Parts

Part Overview

The 74ACTQ02SCX is a 4-channel 2-input NOR gate logic IC manufactured by onsemi in a 14-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74ACTQ02SCX operates within a 4.5V to 5.5V supply voltage range and is suitable for standard TTL-compatible 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 - Output High, Low	24mA, 24mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Operating Temperature	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the 74ACTQ02SCX is determined by the following criteria:

Logic Function: All substitute parts must implement 4-channel 2-input NOR gate functionality
Electrical Specifications: Supply voltage range (4.5V ~ 5.5V), output current capability (24mA), and input logic levels must be compatible
Package Compatibility: All substitutes use the 14-SOIC surface mount package with identical physical dimensions
Propagation Delay: Substitute parts may have different propagation delays; the 74ACTQ02SCX specifies 7.5ns maximum at 5V with 50pF load

The substitute parts identified are based on the 74ACT02 base product number series, which maintains functional and electrical equivalence while offering different product statuses and packaging options.

Parameter Comparison

Parameter	74ACTQ02SCX	MC74ACT02DG	MC74ACT02DR2G	CD74ACT02M	CD74ACT02M96
Manufacturer	onsemi	onsemi	onsemi	Harris Corporation	Harris Corporation
Product Status	Obsolete	Active	Active	Obsolete	Obsolete
Logic Type	NOR Gate	NOR Gate	NOR Gate	NOR Gate	NOR Gate
Number of Circuits	4	4	4	4	4
Number of Inputs	2	2	2	2	2
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent (Max)	2 µA	4 µA	4 µA	4 µA	4 µA
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Input Logic Level - Low	0.8V	0.8V	0.8V	0.8V	0.8V
Input Logic Level - High	2V	2V	2V	2V	2V
Max Propagation Delay @ 5V, 50pF	7.5ns	9.5ns	9.5ns	12.2ns	12.2ns
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

MC74ACT02DG and MC74ACT02DR2G are the preferred substitutes for the obsolete 74ACTQ02SCX. Both are manufactured by onsemi with active product status, ensuring long-term availability and supply chain reliability. MC74ACT02DR2G is packaged in Tape & Reel format suitable for automated assembly, while MC74ACT02DG is available in Tube packaging. Both achieve ROHS3 compliance and maintain full electrical compatibility with the original part. The propagation delay increases from 7.5ns to 9.5ns, which remains acceptable for most standard logic applications.

Secondary Substitutes (Obsolete Product Status):

CD74ACT02M and CD74ACT02M96, manufactured by Harris Corporation, are functionally equivalent but carry obsolete product status. These parts offer extended operating temperature range (-55°C to 125°C) compared to the original specification (-40°C to 85°C), making them suitable for industrial or military-grade applications requiring wider temperature tolerance. However, RoHS non-compliance and obsolete status limit their suitability for new designs. These parts should be considered only when extended temperature performance is a critical requirement and supply availability is confirmed.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT02DG directly replace 74ACTQ02SCX in existing designs?

A: Yes. MC74ACT02DG maintains identical logic function, package, and electrical specifications. The increased propagation delay (9.5ns vs 7.5ns) is within acceptable margins for standard TTL-compatible logic circuits. Pin-for-pin compatibility is confirmed.

Q: What is the difference between MC74ACT02DG and MC74ACT02DR2G?

A: Both parts are electrically identical. The primary difference is packaging: MC74ACT02DG is supplied in Tube format for manual handling, while MC74ACT02DR2G is supplied in Tape & Reel format optimized for automated pick-and-place assembly. Select based on assembly process requirements.

Q: Why do CD74ACT02M and CD74ACT02M96 have different propagation delays?

A: Both Harris Corporation parts specify 12.2ns maximum propagation delay at 5V with 50pF load, which is higher than the onsemi alternatives. This difference reflects manufacturing process variations between manufacturers. Both remain within acceptable logic timing for standard applications.

Q: Are the Harris Corporation parts suitable for new production designs?

A: CD74ACT02M and CD74ACT02M96 carry obsolete product status and RoHS non-compliance. They are not recommended for new production designs. Use onsemi MC74ACT02 series parts for new designs to ensure compliance and supply continuity.

Q: What is the significance of the operating temperature range difference?

A: The 74ACTQ02SCX and onsemi MC74ACT02 series operate from -40°C to 85°C, suitable for commercial and industrial applications. Harris Corporation CD74ACT02 parts extend to -55°C to 125°C, supporting military and extended-temperature industrial applications. Select based on application temperature requirements.

Q: Is the 14-SOIC package identical across all substitute parts?

A: Yes. All parts use the 14-SOIC (0.154", 3.90mm Width) surface mount package with identical pinout and physical dimensions, ensuring direct PCB compatibility without layout modifications.

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