MM74C02N NOR Gate IC Equivalent & Substitute Parts

Part Overview

The MM74C02N is a 4-channel NOR gate logic IC manufactured by onsemi, housed in a 14-pin DIP package. This component implements four independent 2-input NOR logic functions and operates across a wide supply voltage range of 3V to 15V. The MM74C02N is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system maintenance, repair, and legacy design support.

Key Parameters

Parameter	MM74C02N
Logic Type	NOR Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	3V ~ 15V
Current - Output High, Low	8mA, 8mA
Input Logic Level - Low	1.5V ~ 2V
Input Logic Level - High	4.6V ~ 8V
Max Propagation Delay @ V, Max CL	60ns @ 10V, 50pF
Operating Temperature	-55°C ~ 125°C
Package / Case	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

The CD4001BE qualifies as a functional substitute for the MM74C02N based on the following critical parameters:

Logic Function: Both devices implement 4-channel 2-input NOR gate logic
Package Type: Both use 14-pin DIP through-hole mounting with identical 0.300" (7.62mm) pitch
Supply Voltage Compatibility: CD4001BE operates at 3V ~ 18V, which encompasses the MM74C02N operating range of 3V ~ 15V
Input Logic Levels: CD4001BE input thresholds (Low: 1.5V ~ 4V, High: 4.6V ~ 11V) overlap with MM74C02N specifications
Operating Temperature Range: Both devices support -55°C ~ 125°C
Output Current Capability: CD4001BE provides 3.4mA output current, which is lower than MM74C02N (8mA) but sufficient for standard logic-level loads

Parameter Comparison

Parameter	MM74C02N	CD4001BE	Notes
Manufacturer	onsemi	Texas Instruments	Different manufacturers
Logic Type	NOR Gate	NOR Gate	Identical function
Number of Circuits	4	4	Identical
Number of Inputs	2	2	Identical
Voltage - Supply	3V ~ 15V	3V ~ 18V	CD4001BE has wider range
Current - Output High, Low	8mA, 8mA	3.4mA, 3.4mA	MM74C02N has higher output current
Input Logic Level - Low	1.5V ~ 2V	1.5V ~ 4V	CD4001BE has wider tolerance
Input Logic Level - High	4.6V ~ 8V	4.6V ~ 11V	CD4001BE has wider tolerance
Max Propagation Delay @ V, Max CL	60ns @ 10V, 50pF	90ns @ 15V, 50pF	MM74C02N has faster propagation
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	Identical
Package / Case	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	Pin-compatible
Mounting Type	Through Hole	Through Hole	Identical
Product Status	Obsolete	Active	CD4001BE actively manufactured

Engineering Selection Recommendations

The CD4001BE is a suitable substitute for the MM74C02N in applications where the following conditions are met:

Output Current Requirements: The application does not require output currents exceeding 3.4mA. If the original design relies on the MM74C02N's 8mA output capability for direct load driving, load impedance or buffering must be re-evaluated.
Propagation Delay Tolerance: The application can tolerate propagation delays up to 90ns. The MM74C02N specifies 60ns maximum delay, while the CD4001BE specifies 90ns. Timing-critical circuits operating near the MM74C02N's delay specification require verification.
Supply Voltage: The CD4001BE's extended supply range (3V ~ 18V) provides additional operational flexibility compared to the MM74C02N (3V ~ 15V).
Product Availability: The CD4001BE is actively manufactured by Texas Instruments with substantial inventory availability (17,600 pcs), whereas the MM74C02N is obsolete.
Compliance: The CD4001BE is RoHS3 compliant, providing environmental compliance advantages for new designs and system updates.

Frequently Asked Questions (FAQ)

Q: Are MM74C02N and CD4001BE pin-compatible?

A: Yes. Both devices use 14-pin DIP packages with 0.300" (7.62mm) pitch. Pin assignments for the NOR gate functions are identical, allowing direct socket substitution without PCB modification.

Q: What is the primary difference in output current capability?

A: The MM74C02N provides 8mA output current, while the CD4001BE provides 3.4mA. For applications driving high-impedance inputs or standard logic loads, the CD4001BE is adequate. Applications requiring direct drive of low-impedance loads or multiple parallel inputs may require output buffering when using the CD4001BE.

Q: Can the CD4001BE replace the MM74C02N in timing-critical applications?

A: The CD4001BE has a maximum propagation delay of 90ns compared to the MM74C02N's 60ns. Applications with timing margins greater than 30ns can accommodate this difference. Circuits with tighter timing requirements require detailed timing analysis.

Q: What is the supply voltage compatibility between these parts?

A: The MM74C02N operates at 3V ~ 15V, while the CD4001BE operates at 3V ~ 18V. The CD4001BE can be used in any circuit designed for the MM74C02N's voltage range. The CD4001BE also supports higher supply voltages up to 18V if the application requires this capability.

Q: Is the CD4001BE suitable for new designs?

A: Yes. The CD4001BE is actively manufactured and RoHS3 compliant, making it appropriate for new product development and legacy system updates.

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