74ACTQ02SC NOR Gate IC Equivalent & Substitute Parts

Part Overview

The 74ACTQ02SC is a 4-channel 2-input NOR gate logic IC manufactured by onsemi in 14-SOIC surface mount packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The 74ACTQ02SC operates within a 4.5V to 5.5V supply voltage range and is designed for standard TTL logic applications requiring NOR gate functionality. Due to its obsolete status, active production alternatives from the same logic family are available to maintain design compatibility.

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)	2 µA
Current - Output High, Low	24mA, 24mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ 5V, 50pF	7.5ns
Operating Temperature	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74ACTQ02SC is determined by the following critical parameters:

Logic configuration: 4-channel NOR gate with 2 inputs per channel
Package type: 14-SOIC surface mount form factor
Supply voltage range: 4.5V ~ 5.5V compatibility
Output drive capability: 24mA high and low
Input logic thresholds: 0.8V low, 2V high
Thermal operating range: -40°C to 85°C minimum

All substitute parts maintain identical logic configuration, pinout, and package dimensions. Variations in propagation delay and quiescent current are within acceptable tolerances for standard logic applications. Substitute parts are drawn from the 74ACT and 74ACTQ series families, which share the same functional specification and pin compatibility.

Parameter Comparison

Parameter	74ACTQ02SC	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 Recommendation: MC74ACT02DG or MC74ACT02DR2G

Both onsemi parts maintain active production status and provide ROHS3 compliance. MC74ACT02DG is supplied in tube packaging, while MC74ACT02DR2G is supplied in tape and reel format. These parts are direct functional equivalents with identical pinout and package dimensions. Propagation delay increases from 7.5ns to 9.5ns, which remains within acceptable margins for standard logic timing applications.

Secondary Options: CD74ACT02M or CD74ACT02M96

Harris Corporation parts are functionally equivalent but carry obsolete status. These parts offer extended operating temperature range (-55°C to 125°C) compared to the original specification (-40°C to 85°C). However, RoHS non-compliance status should be evaluated against procurement requirements. CD74ACT02M is supplied in tube packaging, while CD74ACT02M96 is supplied in bulk format.

Selection Criteria:

For new designs or long-term production: Select MC74ACT02DG or MC74ACT02DR2G (active status, RoHS3 compliant)
For legacy system maintenance: CD74ACT02M or CD74ACT02M96 are functionally compatible if RoHS compliance is not required
Packaging format selection: Tube for manual assembly, tape and reel for automated pick-and-place operations

Frequently Asked Questions (FAQ)

Q: Can MC74ACT02DG directly replace 74ACTQ02SC without circuit modification?

A: Yes. Both parts share identical pinout, logic configuration (4-channel 2-input NOR gate), package dimensions (14-SOIC), and electrical specifications including supply voltage (4.5V ~ 5.5V), input logic thresholds, and output drive capability (24mA). The 2ns increase in propagation delay (7.5ns to 9.5ns) does not require circuit redesign for standard logic applications.

Q: What is the difference between MC74ACT02DG and MC74ACT02DR2G?

A: Both parts are electrically and functionally identical. The difference is packaging format: MC74ACT02DG is supplied in tube packaging for manual assembly, while MC74ACT02DR2G is supplied in tape and reel format for automated assembly equipment.

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

A: Both Harris Corporation parts specify identical maximum propagation delay of 12.2ns at 5V with 50pF load. The difference between CD74ACT02M and CD74ACT02M96 is packaging format (tube versus bulk), not electrical performance.

Q: Are the Harris Corporation parts (CD74ACT02M series) suitable for new designs?

A: Harris Corporation parts are functionally compatible but carry obsolete status. For new designs, onsemi parts (MC74ACT02DG or MC74ACT02DR2G) are recommended due to active production status and ROHS3 compliance. Harris parts are suitable for legacy system maintenance where RoHS compliance is not a requirement.

Q: What does the extended operating temperature range (-55°C to 125°C) on Harris parts mean for substitution?

A: The Harris parts support a wider temperature range than the original 74ACTQ02SC (-40°C to 85°C). This provides additional thermal margin but does not affect functional compatibility. Applications operating within the original -40°C to 85°C range will function identically with either part.

Q: Is RoHS compliance important for selecting a substitute?

A: RoHS compliance depends on application and procurement requirements. onsemi parts (MC74ACT02DG and MC74ACT02DR2G) are ROHS3 compliant, meeting current environmental regulations. Harris parts are RoHS non-compliant. Verify your procurement and regulatory requirements before final part selection.

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