74LCX00MX NAND Gate IC Equivalent & Substitute Parts

Part Overview

The 74LCX00MX is a 4-channel 2-input NAND gate logic IC manufactured by onsemi, housed in a 14-SOIC surface mount package. This part operates across a 2V to 3.6V supply voltage range and is designed for low-power logic applications. The 74LCX00MX is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain the same logic function, pin configuration, and package footprint while offering either active product status or extended operational specifications.

Key Parameters

Parameter	Value
Logic Type	NAND Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	2V ~ 3.6V
Current - Quiescent (Max)	10 µA
Current - Output High, Low	24mA, 24mA
Input Logic Level - Low	0.7V ~ 0.8V
Input Logic Level - High	1.7V ~ 2V
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

Substitute Part Grouping Explanation

Substitution eligibility for the 74LCX00MX is determined by the following criteria:

Functional Equivalence: All substitute parts must be 4-channel 2-input NAND gates with identical logic function and pin configuration.

Package Compatibility: All parts must use the 14-SOIC (0.154", 3.90mm Width) surface mount package to ensure PCB footprint compatibility.

Electrical Parameters: Substitute parts must support the required supply voltage range (minimum 2V to 3.6V overlap), maintain output drive capability (24mA minimum), and meet propagation delay specifications at 3.3V and 50pF load.

Logic Thresholds: Input logic levels must be compatible with the original specification (Low: 0.7V ~ 0.8V, High: 1.7V ~ 2V).

Compliance: All substitute parts must maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating.

Substitute parts are grouped into two categories: onsemi 74LCX series variants (MC74LCX00DG, MC74LCX00DR2G, 74LCX00YMTR) and cross-manufacturer 74LVC series alternatives (74LVC00AS14-13, SN74LVC00ADR, SN74LVC00AD, 74LVC00AD,118, 74LVC00AD-Q100J, SN74LVC00ADT, SN74LVC00ADRG4). The 74LVC series offers extended supply voltage ranges (1.65V ~ 5.5V or 1.2V ~ 3.6V) and lower quiescent current in some variants, providing additional design flexibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Supply	Current - Quiescent (Max)	Propagation Delay @ 3.3V, 50pF	Operating Temperature	Packaging
74LCX00MX	onsemi	Obsolete	2V ~ 3.6V	10 µA	5.2ns	-40°C ~ 85°C	Cut Tape (CT) & Digi-Reel®
MC74LCX00DG	onsemi	Active	2V ~ 3.6V	10 µA	5.5ns	-40°C ~ 85°C	Tube
MC74LCX00DR2G	onsemi	Active	2V ~ 3.6V	10 µA	5.5ns	-40°C ~ 85°C	Tape & Reel (TR)
74LCX00YMTR	STMicroelectronics	Active	2V ~ 3.6V	10 µA	4.3ns	-40°C ~ 85°C	Tape & Reel (TR)
74LVC00AS14-13	Diodes Incorporated	Active	1.65V ~ 5.5V	10 µA	4.1ns	-40°C ~ 125°C	Tape & Reel (TR)
SN74LVC00ADR	Texas Instruments	Active	1.65V ~ 3.6V	1 µA	4.1ns	-40°C ~ 125°C	Tape & Reel (TR)
SN74LVC00AD	Texas Instruments	Active	1.65V ~ 3.6V	1 µA	4.1ns	-40°C ~ 125°C	Tube
74LVC00AD,118	Nexperia USA Inc.	Active	1.2V ~ 3.6V	40 µA	4.3ns	-40°C ~ 125°C	Tape & Reel (TR)
74LVC00AD-Q100J	Nexperia USA Inc.	Active	1.2V ~ 3.6V	40 µA	4.3ns	-40°C ~ 125°C	Tape & Reel (TR)
SN74LVC00ADT	Texas Instruments	Active	1.65V ~ 3.6V	1 µA	4.1ns	-40°C ~ 125°C	Tape & Reel (TR)
SN74LVC00ADRG4	Texas Instruments	Discontinued at DiGi Electronics	1.65V ~ 3.6V	1 µA	4.1ns	-40°C ~ 125°C	14-SOIC

Engineering Selection Recommendations

Primary Substitutes (Active Status, onsemi 74LCX Series):

MC74LCX00DG and MC74LCX00DR2G are direct onsemi 74LCX series equivalents with identical electrical specifications to the 74LCX00MX. Both maintain the 2V to 3.6V supply range, 10 µA quiescent current, and -40°C to 85°C operating temperature. MC74LCX00DR2G is packaged in Tape & Reel format, suitable for high-volume production. MC74LCX00DG is supplied in Tube packaging for lower-volume applications. Propagation delay is marginally higher at 5.5ns compared to the original 5.2ns specification.

Cross-Manufacturer Alternatives (74LVC Series):

SN74LVC00ADR, SN74LVC00AD, and SN74LVC00ADT (Texas Instruments) offer superior performance with 4.1ns propagation delay and significantly reduced quiescent current (1 µA). These parts support the 1.65V to 3.6V supply range, which encompasses the original 2V to 3.6V specification. Extended operating temperature range (-40°C to 125°C) provides additional thermal margin. All three variants maintain ROHS3 compliance and MSL 1 rating.

74LVC00AS14-13 (Diodes Incorporated) provides the widest supply voltage range (1.65V to 5.5V) and fastest propagation delay (4.1ns). Extended operating temperature to 125°C is supported. This part is suitable for applications requiring voltage flexibility.

74LVC00AD,118 and 74LVC00AD-Q100J (Nexperia USA Inc.) support the lowest supply voltage (1.2V minimum) with 4.3ns propagation delay. The Q100J variant includes AEC-Q100 automotive qualification. Both parts feature 40 µA quiescent current, which is higher than the original specification but acceptable for non-power-critical applications.

Discontinued Parts:

SN74LVC00ADRG4 is discontinued at DiGi Electronics and should not be selected for new designs despite meeting electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 74LCX00MX with a 74LVC series part?

A: Yes. The 74LVC series parts (SN74LVC00ADR, SN74LVC00AD, SN74LVC00ADT, 74LVC00AS14-13, 74LVC00AD,118, 74LVC00AD-Q100J) are functionally equivalent NAND gate ICs with identical pin configuration and 14-SOIC package. All 74LVC variants support the 2V to 3.6V supply range required by the original part. The 74LVC series offers improved performance (faster propagation delay, lower quiescent current in some variants) and extended operating temperature ranges.

Q: What is the difference between onsemi 74LCX and Texas Instruments 74LVC variants?

A: Both are 4-channel 2-input NAND gate ICs with identical logic function and package. The primary differences are manufacturer, quiescent current specifications, and supply voltage ranges. Texas Instruments 74LVC parts (SN74LVC00ADR, SN74LVC00AD, SN74LVC00ADT) feature 1 µA quiescent current compared to 10 µA for onsemi 74LCX parts, making them more suitable for low-power applications. Texas Instruments parts support 1.65V to 3.6V supply range, while onsemi 74LCX parts are specified for 2V to 3.6V.

Q: Are all substitute parts available in the same packaging?

A: All substitute parts use the 14-SOIC (0.154", 3.90mm Width) surface mount package, ensuring PCB footprint compatibility. However, packaging formats differ: some are supplied in Tube, others in Tape & Reel (TR), and one in Cut Tape (CT) & Digi-Reel®. Tape & Reel packaging is standard for high-volume production, while Tube packaging is typical for lower-volume orders.

Q: Does the 74LVC00AD-Q100J offer any advantage over standard 74LVC parts?

A: The 74LVC00AD-Q100J includes AEC-Q100 automotive qualification, indicating compliance with automotive reliability and quality standards. This variant is suitable for automotive applications requiring certified components. Electrically, it is identical to the standard 74LVC00AD,118.

Q: What is the impact of propagation delay differences between substitute parts?

A: The original 74LCX00MX specifies 5.2ns maximum propagation delay at 3.3V with 50pF load. Substitute parts range from 4.1ns to 5.5ns. Faster propagation delay (4.1ns in 74LVC series) improves timing margins and supports higher-frequency logic operations. Slightly slower propagation delay (5.5ns in MC74LCX00DR2G) remains within acceptable limits for most applications but may require timing verification in critical paths.

Q: Can I use 74LVC00AD,118 in applications requiring low quiescent current?

A: No. The 74LVC00AD,118 specifies 40 µA maximum quiescent current, which is four times higher than the original 74LCX00MX (10 µA) and significantly higher than Texas Instruments 74LVC variants (1 µA). For power-sensitive applications, select SN74LVC00ADR, SN74LVC00AD, or SN74LVC00ADT instead.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original 74LCX00MX specifications.

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