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Home > Products > Integrated Circuits (ICs) > Logic > Gates and Inverters

onsemi 74LCX02SJX

Name: 74LCX02SJX
Brand: onsemi
SKU: 74LCX02SJX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LCX02SJX

Manufacturer:: onsemi

Category:: Gates and Inverters

Package:: 14-SOIC (0.209", 5.30mm Width)

Datasheet:: 74LCX02SJX.pdf

Description:: IC GATE NOR 4CH 2-INP 14SOP

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Product details

Overview

74LCX02SJX from onsemi is a low-voltage quad 2-input NOR gate IC with 5 V tolerant inputs, designed for level-shifting between 3.3 V and 5 V logic domains. It operates across 1.65–5.5 V V_CC, delivers ≤5.2 ns propagation delay at 3.3 V, supports ±24 mA output drive, and features power-down high-impedance I/O for bus isolation in mixed-voltage systems.

For engineers reviewing the 74LCX02SJX datasheet, pinout, applications, or equivalent options, key selection criteria include 5 V input tolerance, TSSOP-14 package compatibility, sub-6 ns timing at 3.3 V, ESD robustness (>2000 V HBM), and compliance with Pb-free, halide-free, RoHS requirements.

Technical Context

The 74LCX02SJX implements four independent 2-input NOR gates using advanced CMOS technology optimized for high-speed, low-power operation. Its input structure tolerates up to 5.5 V regardless of V_CC, enabling direct interfacing between legacy 5 V peripherals and modern 3.3 V microcontrollers without external level shifters.

Each gate exhibits rail-to-rail output swing, supports tri-state behavior during power-down (V_CC = 0 V), and integrates proprietary noise/EMI reduction circuitry. Latch-up immunity exceeds 100 mA, and thermal resistance (θ_JA) is rated at 150 °C/W under JEDEC-standard board conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65 V to 5.5 V - Enables single-supply operation across 3.3 V and 5 V systems without voltage translation.
t_PD Max	5.2 ns at V_CC = 3.3 V - Ensures reliable timing in high-speed digital control paths and address decoding.
I_O Drive	±24 mA at V_CC = 3.0 V - Sufficient to directly drive multiple LS-TTL loads or small capacitive buses.
Input Tolerance	Up to 5.5 V - Allows safe connection to 5 V signals while powered from 3.3 V, eliminating external clamping diodes.
ESD Rating	>2000 V HBM - Provides robust handling in manual assembly and field-replaceable module environments.
Power-Down State	High-impedance I/O - Prevents back-driving and contention when V_CC is removed or inactive.

Pinout & Package

TSSOP-14 wide-body package (Case 948G), 5.0 mm × 4.4 mm footprint, 0.65 mm pitch, Pb-free and RoHS compliant.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 4, 5, 8, 9, 11, 12	NOR Gate Inputs (A1/B1, A2/B2, A3/B3, A4/B4)	Four independent 2-input NOR gate pairs; each input accepts 0–5.5 V regardless of V_CC.
3, 6, 10, 13	NOR Gate Outputs (Y1–Y4)	Active-low outputs swing rail-to-rail; capable of sourcing/sinking ±24 mA at 3.0 V.
7	GND	Ground reference for all logic and power domains; must be connected before V_CC.
14	V_CC	Primary supply input (1.65–5.5 V); powers internal logic and defines output voltage levels.

Key Features

Feature	Design Value
5 V tolerant inputs	Enables seamless integration into mixed-voltage systems without external level-shifting components.
Low propagation delay	5.2 ns max at 3.3 V ensures minimal timing skew in synchronous logic and clock distribution networks.
High-output drive strength	±24 mA capability allows direct interface to legacy TTL loads or moderate-capacitance PCB traces.
Power-down high-impedance I/O	Prevents signal contention and leakage current during system sleep or hot-swap events.
Noise/EMI reduction circuitry	Reduces switching noise and radiated emissions in dense PCB layouts with shared power rails.

Applications

Industrial PLC I/O Modules	Automotive Body Control Units
Use Scenario: Interfacing 5 V sensor outputs (e.g., analog-to-digital converter status flags) to a 3.3 V ARM-based controller in programmable logic controllers. IC Role / Device Role / Timing Role: Level-shifting NOR gate performing active-low enable logic and signal conditioning prior to microcontroller input capture. Use Value: Eliminates need for discrete level translators, reduces BOM count, and maintains <5.2 ns timing margin for real-time interrupt response.	Use Scenario: Driving LED indicators and relay drivers from a 3.3 V CAN microcontroller while accepting 5 V wake-up signals from door latch switches. IC Role / Device Role / Timing Role: Voltage-tolerant logic gate implementing OR/NOR functions for multi-source wake detection and status indication. Use Value: Supports dual-supply domain interoperability without additional voltage regulators or protection circuitry.
Medical Diagnostic Equipment	Networking Switch Management Cards
Use Scenario: Isolating and combining fault signals from multiple 5 V subsystems (e.g., power supply monitors, temperature sensors) feeding into a 3.3 V FPGA health monitor. IC Role / Device Role / Timing Role: Quad NOR gate used as active-low combiner and bus isolator in safety-critical signal aggregation paths. Use Value: High latch-up immunity (>100 mA) and ESD robustness (>2000 V HBM) ensure reliability in clinical environments with frequent electrostatic discharge events.	Use Scenario: Implementing reset coordination logic between 5 V PHY management interfaces and 3.3 V switch fabric controllers in enterprise Ethernet switches. IC Role / Device Role / Timing Role: NOR gate providing synchronized, glitch-free reset assertion across voltage domains during power sequencing. Use Value: Sub-6 ns propagation delay and rail-to-rail output swing guarantee deterministic reset timing across mixed-voltage ASIC interfaces.

Industrial PLC I/O Modules

Automotive Body Control Units

Use Scenario: Interfacing 5 V sensor outputs (e.g., analog-to-digital converter status flags) to a 3.3 V ARM-based controller in programmable logic controllers.

IC Role / Device Role / Timing Role: Level-shifting NOR gate performing active-low enable logic and signal conditioning prior to microcontroller input capture.

Use Value: Eliminates need for discrete level translators, reduces BOM count, and maintains <5.2 ns timing margin for real-time interrupt response.

Use Scenario: Driving LED indicators and relay drivers from a 3.3 V CAN microcontroller while accepting 5 V wake-up signals from door latch switches.

IC Role / Device Role / Timing Role: Voltage-tolerant logic gate implementing OR/NOR functions for multi-source wake detection and status indication.

Use Value: Supports dual-supply domain interoperability without additional voltage regulators or protection circuitry.

Medical Diagnostic Equipment

Networking Switch Management Cards

Use Scenario: Isolating and combining fault signals from multiple 5 V subsystems (e.g., power supply monitors, temperature sensors) feeding into a 3.3 V FPGA health monitor.

IC Role / Device Role / Timing Role: Quad NOR gate used as active-low combiner and bus isolator in safety-critical signal aggregation paths.

Use Value: High latch-up immunity (>100 mA) and ESD robustness (>2000 V HBM) ensure reliability in clinical environments with frequent electrostatic discharge events.

Use Scenario: Implementing reset coordination logic between 5 V PHY management interfaces and 3.3 V switch fabric controllers in enterprise Ethernet switches.

IC Role / Device Role / Timing Role: NOR gate providing synchronized, glitch-free reset assertion across voltage domains during power sequencing.

Use Value: Sub-6 ns propagation delay and rail-to-rail output swing guarantee deterministic reset timing across mixed-voltage ASIC interfaces.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NOR gate applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC02APW	Lower V_CC min (1.65 V same), but only 5 V tolerant up to 5.5 V with V_CC ≥ 2.3 V; t_PD = 4.5 ns @ 3.3 V.	Requires stable ≥2.3 V V_CC to guarantee 5 V input tolerance; less suitable for 1.8 V–2.0 V operation with 5 V inputs.	Preferred where faster timing is critical and V_CC remains ≥2.3 V; verify input tolerance spec per operating condition.
74ALVC02PW	Higher drive (±24 mA same), but narrower V_CC range (1.65–3.6 V); no 5 V tolerance above 3.6 V V_CC.	Cannot accept 5 V inputs unless V_CC = 3.6 V; unsuitable for true 5 V ↔ 3.3 V bridging.	Select only if system uses strictly ≤3.6 V supplies and 5 V signals are absent or pre-conditioned.

Compared with SN74LVC02APW and 74ALVC02PW, the 74LCX02SJX uniquely guarantees 5 V input tolerance across its full 1.65–5.5 V V_CC range - making it the only option among the three for robust 5 V-to-3.3 V level shifting without supply dependency constraints.

Availability

74LCX02SJX is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and guaranteed Pb-free compliance.

Supply support for 74LCX02SJX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

onsemi is a global semiconductor manufacturer specializing in energy-efficient, high-performance silicon solutions for automotive, industrial, cloud, and medical applications.

The 74LCX02SJX belongs to the LCX family of low-voltage, 5 V tolerant logic ICs engineered for mixed-signal system interfacing, particularly where legacy 5 V components must coexist with modern low-voltage controllers.

FAQ

What is the maximum input voltage the 74LCX02SJX can tolerate?

The 74LCX02SJX supports DC input voltages up to 5.5 V regardless of V_CC level - a key feature enabling direct connection to 5 V signals while operating from 1.65–5.5 V supplies. This tolerance is specified in the Absolute Maximum Ratings table and confirmed across all recommended V_CC ranges in the datasheet.

Does the 74LCX02SJX support power-down mode with high-impedance I/O?

Yes, the 74LCX02SJX enters a power-down state when V_CC = 0 V, placing both inputs and outputs in high-impedance mode. This prevents back-driving, reduces leakage, and avoids bus contention - critical for hot-swap and low-power standby applications. The feature is explicitly documented in the Features section and DC Electrical Characteristics table (IOFF parameter).

What is the typical propagation delay of the 74LCX02SJX at 3.3 V supply?

The 74LCX02SJX has a maximum propagation delay (t_PLH/t_PHL) of 5.2 ns at V_CC = 3.3 V and TA = −40°C to +125°C, as specified in the AC Electrical Characteristics table. Typical values are lower (e.g., ~4.0 ns), but design margins should use the 5.2 ns max for timing closure in synchronous systems.

Is the 74LCX02SJX RoHS compliant and lead-free?

Yes, the 74LCX02SJX is Pb-free, halide-free, and RoHS compliant, as stated in the Features section and confirmed in the Ordering Information table. The marking "G" or microdot indicates Pb-free packaging, and the TSSOP-14 WB package (Case 948G) meets J-STD-020 moisture sensitivity level 1 requirements.

Can unused inputs on the 74LCX02SJX be left floating?

No - unused inputs on the 74LCX02SJX must be tied to a valid logic level (GND or V_CC) as specified in the Recommended Operating Conditions note. Floating inputs may cause increased ICC, oscillation, excessive power dissipation, or unpredictable output states due to CMOS input stage sensitivity.

74LCX02SJX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LCX

Package/Case:: 14-SOIC (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: NOR Gate

Number of Circuits:: 4

Number of Inputs:: 2

Features:: -

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 @ V, Max CL:: 5.2ns @ 3.3V, 50pF

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOP

74LCX02SJX FAQ

1.How can I place an order for 74LCX02SJX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LCX02SJX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 74LCX02SJX reliable?

The price and inventory of 74LCX02SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX02SJX is usually 5 days.

3.What payment methods are accepted for 74LCX02SJX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX02SJX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LCX02SJX?

74LCX02SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LCX02SJX order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 74LCX02SJX?

For technical support, including 74LCX02SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX02SJX requirements.

6.How does Aetrix verify that 74LCX02SJX is sourced from the original manufacturer or authorized distributors?

All 74LCX02SJX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74LCX02SJX meets industry standards.

7.What is the process for return or replacement of 74LCX02SJX?

All 74LCX02SJX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX02SJX, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 74LCX02SJX part is unused and in its original packaging.

Return procedure for 74LCX02SJX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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