74LCX02M NOR Gate IC Equivalent & Substitute Parts

Part Overview

The 74LCX02M 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 74LCX02M operates across a 2V to 3.6V supply voltage range with low quiescent current and standard logic switching characteristics suitable for general-purpose digital logic applications.

Key Parameters

Parameter	Value
Logic Type	NOR Gate
Number of Circuits	4
Number of Inputs	2
Voltage Supply Range	2V ~ 3.6V
Current Output High/Low	24mA / 24mA
Max Propagation Delay @ 3.3V, 50pF	5.2ns
Operating Temperature	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74LCX02M is determined by the following critical parameters:

Logic Function: All substitutes must be 4-channel, 2-input NOR gates
Package Compatibility: Primary substitutes maintain 14-SOIC (0.154", 3.90mm) packaging for direct board-level replacement
Voltage Supply Range: Substitutes must support operation within or encompass the 2V to 3.6V range
Output Current Capability: All substitutes provide 24mA output drive capability
Propagation Delay: Maximum delay at 3.3V, 50pF load must not exceed 5.5ns for functional equivalence
Operating Temperature: Substitutes must support the -40°C to 85°C range minimum
Surface Mount Compatibility: All substitutes use surface mount technology

Substitutes are grouped into two categories: direct onsemi equivalents (same manufacturer, same series) and cross-manufacturer alternatives (NXP, Texas Instruments, Nexperia) that meet identical electrical and mechanical specifications.

Parameter Comparison

Part Number	Manufacturer	Series	Voltage Supply	Quiescent Current (Max)	Output Current H/L	Propagation Delay @ 3.3V, 50pF	Operating Temp	Package	Product Status
74LCX02M	onsemi	74LCX	2V ~ 3.6V	10 µA	24mA / 24mA	5.2ns	-40°C ~ 85°C	14-SOIC	Obsolete
MC74LCX02DG	onsemi	74LCX	2V ~ 3.6V	10 µA	24mA / 24mA	5.5ns	-40°C ~ 85°C	14-SOIC	Obsolete
MC74LCX02DR2G	onsemi	74LCX	2V ~ 3.6V	10 µA	24mA / 24mA	5.5ns	-40°C ~ 85°C	14-SOIC	Active
74LVC02AD,118	NXP Semiconductors	74LVC	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Active
74LVC02AD-Q100J	Nexperia USA Inc.	74LVC	1.2V ~ 3.6V	10 µA	24mA / 24mA	4.4ns	-40°C ~ 125°C	14-SO	Active
SN74LVC02AD	Texas Instruments	74LVC	1.65V ~ 3.6V	1 µA	24mA / 24mA	4.2ns	-40°C ~ 125°C	14-SOIC	Active
SN74LVC02ADR	Texas Instruments	74LVC	1.65V ~ 3.6V	1 µA	24mA / 24mA	4.2ns	-40°C ~ 125°C	14-SOIC	Active
SN74LVC02ADT	Texas Instruments	74LVC	1.65V ~ 3.6V	1 µA	24mA / 24mA	4.2ns	-40°C ~ 125°C	14-SOIC	Discontinued at DiGi Electronics
SN74LVC02ANS	Texas Instruments	74LVC	1.65V ~ 3.6V	1 µA	24mA / 24mA	4.2ns	-40°C ~ 125°C	14-SO	Active
SN74LVC02ANSR	Texas Instruments	74LVC	1.65V ~ 3.6V	1 µA	24mA / 24mA	4.2ns	-40°C ~ 125°C	14-SO	Active
SN74LVC02AQDRG4Q1	Texas Instruments	74LVC	2V ~ 3.6V	10 µA	24mA / 24mA	5.5ns	-40°C ~ 125°C	14-SOIC	Active

Engineering Selection Recommendations

Direct Onsemi Series Substitutes (74LCX): MC74LCX02DR2G is the active-status equivalent within the onsemi 74LCX series. It maintains identical electrical specifications to the 74LCX02M with the same 14-SOIC package, differing only in propagation delay (5.5ns vs. 5.2ns) and packaging format (Tape & Reel vs. Tube). This part is suitable for direct replacement in new designs requiring onsemi sourcing.

Cross-Manufacturer Substitutes (74LVC Series): The 74LVC series from Texas Instruments and Nexperia provides superior performance characteristics. SN74LVC02ADR and SN74LVC02AD from Texas Instruments offer lower quiescent current (1 µA vs. 10 µA), faster propagation delay (4.2ns vs. 5.2ns), and extended operating temperature range (-40°C to 125°C vs. -40°C to 85°C). These parts are ROHS3 compliant and maintain 14-SOIC packaging for direct board-level substitution.

SN74LVC02AQDRG4Q1 is qualified to AEC-Q100 automotive standards with active product status, suitable for automotive and high-reliability applications requiring extended temperature operation.

74LVC02AD-Q100J from Nexperia provides the widest voltage supply range (1.2V to 3.6V) and fastest propagation delay (4.4ns), with automotive qualification and active status.

Packaging Considerations: Parts designated with "ANS" or "ANSR" suffix use 14-SO packaging (0.209", 5.30mm width) rather than 14-SOIC (0.154", 3.90mm width), requiring PCB layout verification before substitution.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 74LCX02M with any 74LVC02 variant? A: Yes, provided the 74LVC02 variant maintains 4-channel, 2-input NOR gate configuration, 24mA output drive capability, and compatible package footprint. Verify voltage supply range compatibility with your circuit design. The 74LVC series generally offers improved performance with lower quiescent current and faster switching.

Q: What is the difference between 14-SOIC and 14-SO packaging? A: 14-SOIC (0.154", 3.90mm width) and 14-SO (0.209", 5.30mm width) are different package body widths. PCB footprints are not interchangeable. Verify your board design accommodates the selected package before procurement.

Q: Is the MC74LCX02DR2G a direct replacement for 74LCX02M? A: MC74LCX02DR2G is functionally equivalent with identical electrical specifications. The primary difference is product status (Active vs. Obsolete) and packaging format (Tape & Reel vs. Tube). Both use 14-SOIC packaging and are suitable for direct board-level replacement.

Q: Why do Texas Instruments 74LVC02 parts have lower quiescent current? A: The 74LVC series represents a newer logic family design with improved power efficiency. Quiescent current of 1 µA versus 10 µA in the 74LCX series results in reduced standby power consumption, particularly beneficial in battery-powered or low-power applications.

Q: Are all substitute parts ROHS3 compliant? A: Yes, all listed substitute parts are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), meeting environmental and regulatory requirements equivalent to the 74LCX02M.

Q: Which substitute offers the best performance? A: SN74LVC02ADR and SN74LVC02AD from Texas Instruments provide the fastest propagation delay (4.2ns) and lowest quiescent current (1 µA) with extended operating temperature range. Selection depends on specific application requirements for speed, power consumption, and temperature range.

Q: Can I use SN74LVC02AQDRG4Q1 in automotive applications? A: Yes, SN74LVC02AQDRG4Q1 is qualified to AEC-Q100 automotive standards with active product status, suitable for automotive-grade designs requiring extended temperature operation (-40°C to 125°C).

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