MC74ACT02D NOR Gate IC Equivalent & Substitute Parts

Part Overview

The MC74ACT02D is a 4-channel, 2-input NOR gate logic IC manufactured by onsemi in a 14-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MC74ACT02D 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 - 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-SOIC (0.154", 3.90mm Width)

Substitute Part Grouping Explanation

Substitution for the MC74ACT02D is determined by strict equivalence across the following critical parameters:

Logic Type: NOR Gate (4 channels, 2 inputs per channel)
Package: 14-SOIC surface mount form factor
Voltage Supply Range: 4.5V ~ 5.5V
Input/Output Logic Levels: 0.8V (low), 2V (high)
Output Drive Current: 24mA (high and low)
Quiescent Current: 4 µA maximum

Substitute parts must maintain identical functional specifications and pinout compatibility. Variations in propagation delay and operating temperature range are permitted where the substitute part meets or exceeds the performance envelope of the original part.

Parameter Comparison

Parameter	MC74ACT02D (Main)	MC74ACT02DG (Direct)	CD74ACT02M (Similar)	CD74ACT02M96 (Similar)
Manufacturer	onsemi	onsemi	Harris Corporation	Harris Corporation
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	4 µA
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
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	12.2ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Product Status	Obsolete	Active	Obsolete	Obsolete
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant

Engineering Selection Recommendations

MC74ACT02DG is the primary substitute for MC74ACT02D. Both parts are manufactured by onsemi, share identical electrical specifications and propagation delay characteristics, and maintain the same operating temperature range. MC74ACT02DG holds active product status and is ROHS3 compliant, providing superior long-term availability and regulatory compliance compared to the obsolete MC74ACT02D.

CD74ACT02M and CD74ACT02M96, manufactured by Harris Corporation, are functional equivalents that meet all core electrical requirements. These parts feature extended operating temperature range (-55°C ~ 125°C) and slightly higher propagation delay (12.2ns). Both are classified as obsolete. Selection of Harris Corporation parts should be based on specific temperature range requirements or inventory availability constraints.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT02DG directly replace MC74ACT02D without circuit modification?

A: Yes. MC74ACT02DG is a direct substitute with identical electrical specifications, logic function, and 14-SOIC pinout. No circuit modifications are required.

Q: What is the difference between MC74ACT02DG and the Harris Corporation alternatives?

A: MC74ACT02DG matches the original MC74ACT02D in propagation delay (9.5ns) and operating temperature range (-40°C ~ 85°C). CD74ACT02M and CD74ACT02M96 provide extended temperature operation (-55°C ~ 125°C) but with slightly higher propagation delay (12.2ns). All three are functionally equivalent for standard logic applications.

Q: Are there packaging differences between these substitute parts?

A: All substitute parts use the 14-SOIC surface mount package. MC74ACT02DG is supplied in tube packaging, while CD74ACT02M is supplied in tube and CD74ACT02M96 in bulk. Package format does not affect electrical compatibility.

Q: Why is MC74ACT02DG preferred over the Harris Corporation alternatives?

A: MC74ACT02DG is the active product from the original manufacturer (onsemi) with ROHS3 compliance and superior long-term availability. The Harris Corporation parts are obsolete, making future procurement uncertain.

Q: Do these substitutes meet RoHS compliance requirements?

A: MC74ACT02DG is ROHS3 compliant. CD74ACT02M and CD74ACT02M96 are RoHS non-compliant. Compliance requirements should be verified against your application specifications.

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