74LCX02MTC NOR Gate IC Equivalent & Substitute Parts

Part Overview

The 74LCX02MTC is a 4-channel 2-input NOR gate logic IC manufactured by onsemi in 14-TSSOP surface mount packaging. This part is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The 74LCX02MTC operates across a 2V to 3.6V supply voltage range with low quiescent current and is compliant with RoHS3 and REACH standards.

Key Parameters

Parameter	Value
Logic Type	NOR Gate
Number of Circuits	4
Number of Inputs	2
Voltage Supply Range	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	5.2ns @ 3.3V, 50pF
Operating Temperature	-40°C ~ 85°C
Package Type	14-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74LCX02MTC is determined by the following critical parameters:

Logic function: 4-channel 2-input NOR gate
Package compatibility: 14-TSSOP surface mount form factor
Voltage supply range: Minimum 2V operation capability
Output drive capability: 24mA minimum for both high and low states
Propagation delay: Maximum 5.5ns @ 3.3V, 50pF
Input logic thresholds: Compatible with standard CMOS levels
Temperature range: Minimum -40°C to 85°C operation
Compliance: RoHS3 and REACH standards

Substitute parts are grouped into two categories: onsemi 74LCX series variants (same logic family, different packaging or product status) and cross-manufacturer alternatives from NXP Semiconductors and Texas Instruments using the 74LVC02 series (enhanced low-voltage CMOS logic with extended voltage and temperature ranges).

Parameter Comparison

Part Number	Manufacturer	Voltage Supply	Quiescent Current	Propagation Delay	Operating Temp	Package	Product Status
74LCX02MTC	onsemi	2V ~ 3.6V	10 µA	5.2ns @ 3.3V	-40°C ~ 85°C	14-TSSOP	Obsolete
MC74LCX02DTG	onsemi	2V ~ 3.6V	10 µA	5.5ns @ 3.3V	-40°C ~ 85°C	14-TSSOP	Active
MC74LCX02DTR2G	onsemi	2V ~ 3.6V	10 µA	5.5ns @ 3.3V	-40°C ~ 85°C	14-TSSOP	Active
NLV74LCX02DTR2G	onsemi	2V ~ 3.6V	10 µA	5.5ns @ 3.3V	-40°C ~ 85°C	14-TSSOP	Obsolete
74LVC02APW,118	NXP Semiconductors	1.2V ~ 3.6V	40 µA	5.5ns @ 3.3V	-40°C ~ 125°C	14-TSSOP	Active
SN74LVC02ADBR	Texas Instruments	1.65V ~ 3.6V	1 µA	4.2ns @ 3.3V	-40°C ~ 125°C	14-SSOP	Active
SN74LVC02AMPWREP	Texas Instruments	2V ~ 3.6V	10 µA	5.5ns @ 3.3V	-55°C ~ 125°C	14-TSSOP	Active
SN74LVC02APW	Texas Instruments	1.65V ~ 3.6V	1 µA	4.2ns @ 3.3V	-40°C ~ 125°C	14-TSSOP	Active
SN74LVC02APWE4	Texas Instruments	1.65V ~ 3.6V	1 µA	4.2ns @ 3.3V	-40°C ~ 125°C	14-TSSOP	Discontinued
SN74LVC02APWR	Texas Instruments	1.65V ~ 3.6V	1 µA	4.2ns @ 3.3V	-40°C ~ 125°C	14-TSSOP	Active
SN74LVC02APWT	Texas Instruments	1.65V ~ 3.6V	1 µA	4.2ns @ 3.3V	-40°C ~ 125°C	14-TSSOP	Active

Engineering Selection Recommendations

For designs currently using the obsolete 74LCX02MTC, the following selection criteria apply:

Primary Recommendation - onsemi 74LCX Series: MC74LCX02DTG and MC74LCX02DTR2G are direct functional equivalents with active product status. Both maintain identical electrical specifications and 14-TSSOP packaging. MC74LCX02DTR2G in Tape & Reel packaging offers higher inventory availability (4026 pcs) compared to MC74LCX02DTG in tube packaging (1654 pcs). Both are RoHS3 compliant with unlimited moisture sensitivity rating.

Secondary Recommendation - Texas Instruments 74LVC02 Series: SN74LVC02APW, SN74LVC02APWR, and SN74LVC02APWT provide enhanced specifications with extended operating temperature range (-40°C to 125°C versus -40°C to 85°C) and lower quiescent current (1 µA versus 10 µA). These parts are suitable for applications requiring improved thermal performance or lower power consumption. All three variants are active products in 14-TSSOP packaging with RoHS3 compliance.

Alternative - NXP Semiconductors 74LVC02: 74LVC02APW,118 extends the lower voltage supply limit to 1.2V, enabling operation in ultra-low-voltage applications. This part is active with high inventory availability (361,724 pcs) but operates at higher quiescent current (40 µA).

Package Consideration: SN74LVC02ADBR uses 14-SSOP packaging (0.209", 5.30mm width) instead of 14-TSSOP (0.173", 4.40mm width). This part is not recommended for direct PCB replacement without layout modification.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74LCX02MTC with MC74LCX02DTG or MC74LCX02DTR2G? A: Yes. Both parts are functionally identical with matching voltage supply range (2V ~ 3.6V), quiescent current (10 µA), output drive capability (24mA), and operating temperature range (-40°C ~ 85°C). The only difference is packaging format (tube versus tape & reel). Both are RoHS3 compliant.

Q: What is the difference between 74LCX02 and 74LVC02 series? A: The 74LVC02 series from Texas Instruments and NXP offers extended voltage supply range (1.2V to 1.65V minimum versus 2V minimum) and extended operating temperature range (up to 125°C versus 85°C). The 74LVC02 series also features lower quiescent current in most variants. Both series maintain the same logic function and 14-TSSOP package footprint.

Q: Is SN74LVC02ADBR compatible with the original 74LCX02MTC? A: Functionally yes, but with a package caveat. SN74LVC02ADBR uses 14-SSOP packaging (5.30mm width) instead of 14-TSSOP (4.40mm width). Direct PCB replacement is not possible without layout modification. Pin count and logic function are identical.

Q: Which substitute part has the best availability? A: 74LVC02APW,118 from NXP Semiconductors has the highest inventory (361,724 pcs). Among onsemi parts, MC74LCX02DTR2G has 4,026 pcs available. Among Texas Instruments parts, SN74LVC02APWR has 3,455 pcs available.

Q: Can I use a 74LVC02 part in a design specified for 74LCX02? A: Yes, provided your circuit operates within the 74LVC02 voltage supply range (minimum 1.65V to 1.2V depending on manufacturer). The 74LVC02 series is backward compatible with 74LCX02 logic levels and timing specifications. Verify quiescent current requirements, as 74LVC02 variants range from 1 µA to 40 µA depending on part number.

Q: What does "Discontinued at DiGi Electronics" mean for SN74LVC02APWE4? A: This part is no longer actively distributed through DiGi Electronics but may remain available through other channels. For new designs, select from active product status parts: SN74LVC02APW, SN74LVC02APWR, or SN74LVC02APWT.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts carry RoHS3 compliance certification. All parts also have unlimited moisture sensitivity level (MSL 1), matching the original 74LCX02MTC specification.

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