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

onsemi 74LCX32SJX

Name: 74LCX32SJX
Brand: onsemi
SKU: 74LCX32SJX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LCX32SJX

Manufacturer:: onsemi

Category:: Gates and Inverters

Package:: -

Datasheet:: 74LCX32SJX.pdf

Description:: IC GATE OR

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Product details

Overview

74LCX32SJX from Fairchild Semiconductor is a low-voltage quad 2-input OR gate IC with 5V-tolerant inputs, designed for level-shifting between 3.3V and 5V logic domains. It operates from 2.3V to 3.6V V_CC, delivers ≤5.5ns propagation delay at 3.3V, supports ±24mA output drive at 3.0V, and features power-down high-impedance I/O for bus-hold compatibility in mixed-voltage systems.

For engineers reviewing the 74LCX32SJX datasheet, pinout, applications, or equivalent options, key selection criteria include 5V input tolerance, sub-6ns AC performance at 3.3V, JEDEC-compliant SOP-14 (EIAJ TYPE II) packaging, and guaranteed operation across –40°C to +85°C industrial temperature range.

Technical Context

The 74LCX32SJX implements four independent non-inverting OR logic functions using advanced CMOS process technology optimized for low-voltage, high-speed operation. Its input structure incorporates protection circuitry enabling safe interfacing with 5V signals while powered from 2.3–3.6V supplies - critical for legacy-to-modern system integration.

All four gates share identical DC and AC electrical characteristics: VIH/VIL thresholds are voltage-ratio dependent (e.g., VIH ≥ 2.0V at V_CC ≥ 2.7V), VOL/VOH are specified under defined load conditions (e.g., VOL ≤ 0.55V at I_OL = 24mA, V_CC = 3.0V), and propagation delay skew between outputs is limited to ≤1.0ns.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.3V–3.6V operating supply; enables direct use in 3.3V systems without level translators
Input Voltage Tolerance	Up to 7.0V absolute max; allows safe connection to 5V buses without external clamping
t_PD Max	5.5ns at V_CC = 3.3V, CL = 50pF; supports >100MHz toggle rates in clean signal paths
I_OH/I_OL	±24mA at V_CC = 3.0V; drives standard TTL loads or multiple 74LCX inputs without buffering
ICC Quiescent	≤10µA at V_CC = 3.3V, VI = V_CC or GND; minimizes static power in always-on logic sections
Operating Temp	–40°C to +85°C; qualified for industrial-grade embedded control and communications equipment
ESD Rating	HBM > 2000V; provides robust handling margin during board assembly and field service

Pinout & Package

74LCX32SJX is housed in a 14-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide (package code M14D), with gull-wing leads and standard JEDEC pinout compatible with other 74-series quad OR gates.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 4, 5, 8, 9, 12, 13	Input (A1/B1/A2/B2/A3/B3/A4/B4)	Four independent OR gate inputs; 5V-tolerant, require termination to V_CC or GND when unused
3, 6, 10, 11	Output (Y1/Y2/Y3/Y4)	CMOS-compatible push-pull outputs; support hot-swap high-impedance state during power-down
7	GND	Ground reference for all logic and power domains; must be low-inductance connection
14	V_CC	Primary supply pin; decoupling capacitor (0.1µF ceramic) required within 5mm of this pin

Key Features

Feature	Design Value
5V-tolerant inputs	Enables seamless interface between 3.3V logic and legacy 5V peripherals without external resistors or translators
Power-down high-Z I/O	Prevents bus contention and back-driving during system sleep or reset sequences
Low dynamic power dissipation	CPD = 25pF at 3.3V/10MHz; reduces switching noise and thermal load in dense PCB layouts
Latch-up immunity	Exceeds JEDEC 78 Class II requirements; ensures robustness against transient overvoltage events
Lead-free DQFN option available	MLP14A package variant supports space-constrained designs requiring ultra-thin, no-lead footprint

Applications

Industrial PLC I/O Expansion	Automotive Body Control Module
Use Scenario: Adding discrete OR logic to consolidate fault signals from multiple sensors before feeding into a microcontroller interrupt line. IC Role / Device Role / Timing Role: Signal aggregation logic gate performing real-time wired-OR function on asynchronous status lines. Use Value: Eliminates need for software polling or additional MCU GPIO pins; leverages 5V-tolerant inputs to accept direct sensor outputs without level-shifting.	Use Scenario: Implementing fail-safe door-lock arbitration where multiple unlock requests (key fob, interior switch, remote) must trigger a single actuator enable signal. IC Role / Device Role / Timing Role: Combinational logic element generating active-HIGH enable pulse from any asserted input source. Use Value: Sub-6ns propagation ensures deterministic response timing; ±24mA drive directly interfaces with automotive-grade relay drivers.
Medical Infusion Pump Control	Networking Equipment Status Monitoring
Use Scenario: Combining safety interlock signals (door open, pressure limit exceeded, motor stall) to disable pump motor via hardware cutoff path. IC Role / Device Role / Timing Role: Hardware-level OR gate in safety-critical signal chain; operates independently of firmware execution. Use Value: Guaranteed response under all power conditions due to CMOS rail-to-rail output swing and latch-up immunity per JEDEC 78.	Use Scenario: Aggregating link-status indicators from multiple Ethernet PHYs onto a single FPGA monitoring bus. IC Role / Device Role / Timing Role: Level-shifting combinatorial logic block translating 5V PHY status to 3.3V FPGA input domain. Use Value: 5V-tolerant inputs accept direct PHY outputs; low ICC (≤10µA) avoids loading shared V_CC rails in multi-channel designs.

Industrial PLC I/O Expansion

Automotive Body Control Module

Use Scenario: Adding discrete OR logic to consolidate fault signals from multiple sensors before feeding into a microcontroller interrupt line.

IC Role / Device Role / Timing Role: Signal aggregation logic gate performing real-time wired-OR function on asynchronous status lines.

Use Value: Eliminates need for software polling or additional MCU GPIO pins; leverages 5V-tolerant inputs to accept direct sensor outputs without level-shifting.

Use Scenario: Implementing fail-safe door-lock arbitration where multiple unlock requests (key fob, interior switch, remote) must trigger a single actuator enable signal.

IC Role / Device Role / Timing Role: Combinational logic element generating active-HIGH enable pulse from any asserted input source.

Use Value: Sub-6ns propagation ensures deterministic response timing; ±24mA drive directly interfaces with automotive-grade relay drivers.

Medical Infusion Pump Control

Networking Equipment Status Monitoring

Use Scenario: Combining safety interlock signals (door open, pressure limit exceeded, motor stall) to disable pump motor via hardware cutoff path.

IC Role / Device Role / Timing Role: Hardware-level OR gate in safety-critical signal chain; operates independently of firmware execution.

Use Value: Guaranteed response under all power conditions due to CMOS rail-to-rail output swing and latch-up immunity per JEDEC 78.

Use Scenario: Aggregating link-status indicators from multiple Ethernet PHYs onto a single FPGA monitoring bus.

IC Role / Device Role / Timing Role: Level-shifting combinatorial logic block translating 5V PHY status to 3.3V FPGA input domain.

Use Value: 5V-tolerant inputs accept direct PHY outputs; low ICC (≤10µA) avoids loading shared V_CC rails in multi-channel designs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad OR gate applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC32APWR	Wider V_CC range (1.65–3.6V); slightly higher t_PD (6.7ns @ 3.3V); same SOP-14 footprint	Supports 1.8V logic domains; less suitable for 2.3V-only systems	Preferred when designing for dual 1.8V/3.3V operation or sourcing from TI's long-term availability program
74AHC32PW,118	Higher V_CC range (2.0–5.5V); lower drive (±8mA @ 3.3V); identical pinout	Accepts 5V supply directly; insufficient drive for TTL loads at 3.3V	Chosen when full 5V operation is required and output current demand is ≤8mA

Compared with 74LCX32SJX, SN74LVC32APWR offers broader voltage flexibility but slower speed, while 74AHC32PW,118 supports native 5V operation but lacks the 5V-tolerant input architecture essential for mixed-voltage interfacing - making 74LCX32SJX uniquely suited for 3.3V-core systems interfacing to 5V peripherals.

Availability

74LCX32SJX is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical device applications requiring stable component supply, long-lifecycle support, and guaranteed lead-free compliance.

Supply support for 74LCX32SJX 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

Fairchild Semiconductor was a leading designer of high-performance analog and mixed-signal semiconductors, acquired by ON Semiconductor in 2016; its legacy logic families remain widely deployed in industrial and automotive systems.

The 74LCX series was engineered specifically for low-voltage, high-speed logic interfacing in mixed-supply environments - prioritizing 5V-tolerant inputs, sub-6ns propagation, and industrial temperature reliability.

FAQ

What is the maximum input voltage rating for 74LCX32SJX?

The 74LCX32SJX supports DC input voltages up to +7.0V absolute maximum, independent of V_CC. This 5V-tolerant capability allows direct connection to 5V signal sources while operating from a 2.3–3.6V supply - a core design feature confirmed in the Absolute Maximum Ratings table of Rev. 1.6.1 datasheet. Exceeding +7.0V risks permanent damage to the input protection diodes.

Does 74LCX32SJX support 3-state operation?

No, the 74LCX32SJX does not provide 3-state (high-impedance) output control via an enable pin. However, it features power-down high-impedance inputs and outputs when V_CC is removed or held near 0V - a passive behavior useful during system reset or standby. Active 3-state functionality requires dedicated bus-interface devices like the 74LCX125 or 74LCX244, not the 74LCX32SJX.

What is the recommended decoupling for 74LCX32SJX?

A minimum 0.1µF ceramic capacitor placed within 5mm of the V_CC (pin 14) and GND (pin 7) is required for stable operation. For boards with multiple 74LCX32SJX devices or high-frequency switching, add a bulk 4.7µF tantalum or aluminum electrolytic capacitor per 5–10 ICs. This mitigates supply rail collapse during simultaneous output transitions, as validated by dynamic switching measurements showing VOLP/VOLV peaks up to ±0.8V without proper decoupling.

Can unused inputs on 74LCX32SJX be left floating?

No - unused inputs on the 74LCX32SJX must be externally tied to either V_CC or GND. The datasheet explicitly states in Recommended Operating Conditions (Note 3) that floating inputs may cause excessive ICC, erratic logic behavior, or increased EMI susceptibility due to undefined threshold crossing. This requirement applies to all four OR gates' A and B inputs (pins 1,2,4,5,8,9,12,13) and is critical for industrial temperature stability.

Is 74LCX32SJX pin-compatible with standard 74HC32 or 74LS32?

Yes, the 74LCX32SJX uses the industry-standard 14-pin SOP layout matching 74HC32 and 74LS32, with identical pin assignments for inputs (A1/B1/A2/B2/A3/B3/A4/B4), outputs (Y1/Y2/Y3/Y4), V_CC, and GND. However, it is not a drop-in replacement due to differing V_CC ranges (2.3–3.6V vs. 2.0–6.0V for HC, 4.75–5.25V for LS) and output drive strength - requiring verification of supply voltage and load compatibility before substitution.

74LCX32SJX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Logic Type:: -

Number of Circuits:: -

Number of Inputs:: -

Features:: -

Voltage - Supply:: -

Current - Quiescent (Max):: -

Current - Output High, Low:: -

Input Logic Level - Low:: -

Input Logic Level - High:: -

Max Propagation Delay @ V, Max CL:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

74LCX32SJX FAQ

1.How can I place an order for 74LCX32SJX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LCX32SJX 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 74LCX32SJX reliable?

The price and inventory of 74LCX32SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX32SJX is usually 5 days.

3.What payment methods are accepted for 74LCX32SJX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX32SJX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LCX32SJX?

74LCX32SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LCX32SJX 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 74LCX32SJX?

For technical support, including 74LCX32SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX32SJX requirements.

6.How does Aetrix verify that 74LCX32SJX is sourced from the original manufacturer or authorized distributors?

All 74LCX32SJX 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 74LCX32SJX meets industry standards.

7.What is the process for return or replacement of 74LCX32SJX?

All 74LCX32SJX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX32SJX, 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 74LCX32SJX part is unused and in its original packaging.

Return procedure for 74LCX32SJX:

1.Submit a request within 90 days.

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

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