CD74AC02M NOR Gate IC Equivalent & Substitute Parts

Part Overview

The CD74AC02M is a 4-channel 2-input NOR gate logic IC manufactured by Texas Instruments in 14-SOIC surface mount packaging. This part is discontinued at DiGi Electronics, making substitute parts necessary for ongoing production and maintenance applications. The CD74AC02M operates across a supply voltage range of 1.5V to 5.5V with a maximum propagation delay of 11.5ns at 5V with 50pF load, suitable for general-purpose 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	1.5V ~ 5.5V
Current - Quiescent (Max)	4 µA
Current - Output High, Low	24mA, 24mA
Max Propagation Delay @ 5V, 50pF	11.5ns
Operating Temperature	-55°C ~ 125°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the CD74AC02M is determined by strict equivalence in the following parameters:

Logic type: NOR Gate with 4 channels and 2 inputs per channel
Package type: 14-SOIC surface mount form factor
Functional electrical characteristics: Output drive capability (24mA), quiescent current (4 µA maximum)
Compliance certifications: ROHS3 compliance and REACH unaffected status
Moisture sensitivity level: MSL 1 (Unlimited)

Substitute parts must maintain identical logic configuration and package dimensions to ensure direct PCB compatibility. Variations in supply voltage range, input logic levels, propagation delay, and operating temperature are permitted within the constraints of the application circuit design.

Parameter Comparison

Parameter	CD74AC02M (TI)	CD74AC02M96 (TI)	MC74AC02DR2G (onsemi)	MC74AC02DG (onsemi)
Manufacturer	Texas Instruments	Texas Instruments	onsemi	onsemi
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	1.5V ~ 5.5V	1.5V ~ 5.5V	2V ~ 6V	2V ~ 6V
Current - Quiescent (Max)	4 µA	4 µA	4 µA	4 µA
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Max Propagation Delay @ 5V, 50pF	11.5ns	11.5ns	6.5ns	6.5ns
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Packaging Type	Tube	Cut Tape & Digi-Reel	Tape & Reel	Tube
Product Status	Discontinued	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for current production environments.

CD74AC02M96 (Texas Instruments) provides direct electrical and thermal equivalence with identical supply voltage range (1.5V ~ 5.5V) and operating temperature range (-55°C ~ 125°C). This part is the preferred substitute when thermal performance and extended low-temperature operation are required. Availability in Cut Tape and Digi-Reel packaging supports both prototype and high-volume production workflows.

MC74AC02DR2G and MC74AC02DG (onsemi) are functionally equivalent alternatives with faster propagation delay (6.5ns versus 11.5ns) and wider supply voltage tolerance (2V ~ 6V). These parts operate within a narrower temperature range (-40°C ~ 85°C), suitable for commercial and industrial applications that do not require extended military-grade temperature specifications. MC74AC02DG in tube packaging matches the original packaging format, while MC74AC02DR2G in tape and reel format supports automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can MC74AC02DR2G or MC74AC02DG be used as direct replacements for CD74AC02M?

A: Yes. Both onsemi parts are functionally equivalent NOR gate ICs with identical logic configuration (4 channels, 2 inputs), output drive capability (24mA), and 14-SOIC package dimensions. The faster propagation delay (6.5ns) and narrower operating temperature range (-40°C ~ 85°C) are compatible with most applications designed for the CD74AC02M.

Q: What is the difference between CD74AC02M96 and CD74AC02M?

A: CD74AC02M96 is the active production equivalent manufactured by Texas Instruments. Both parts share identical electrical specifications, supply voltage range (1.5V ~ 5.5V), operating temperature range (-55°C ~ 125°C), and propagation delay (11.5ns). The primary difference is product status: CD74AC02M is discontinued while CD74AC02M96 remains in active production. Packaging differs: CD74AC02M is supplied in tube format while CD74AC02M96 is available in cut tape and Digi-Reel formats.

Q: Are there supply voltage compatibility concerns when substituting with onsemi parts?

A: onsemi parts (MC74AC02DR2G and MC74AC02DG) operate at 2V ~ 6V supply voltage, compared to the CD74AC02M range of 1.5V ~ 5.5V. Applications operating below 2V supply voltage require the Texas Instruments CD74AC02M96. Applications operating between 2V and 5.5V are compatible with all substitute options.

Q: Does the faster propagation delay of onsemi parts affect circuit timing?

A: The onsemi parts feature 6.5ns propagation delay compared to 11.5ns for Texas Instruments parts. Faster propagation delay does not create compatibility issues in circuits designed for the slower specification. Circuits with timing-critical paths may benefit from the improved performance of onsemi substitutes.

Q: What packaging options are available for each substitute?

A: CD74AC02M96 is available in cut tape and Digi-Reel formats for automated assembly. MC74AC02DR2G is supplied in tape and reel format. MC74AC02DG is available in tube packaging, matching the original CD74AC02M format for manual assembly or prototype applications.

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