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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

onsemi 74LCX240WMX

Name: 74LCX240WMX
Brand: onsemi
SKU: 74LCX240WMX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LCX240WMX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: 74LCX240WMX.pdf

Description:: IC BUFFER INVERT 3.6V 20SOIC

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Product details

Overview

74LCX240WMX from onsemi is an inverting octal buffer/line driver with 5 V tolerant inputs and outputs, designed for memory address driving, clock distribution, and bus-oriented transmitter/receiver functions in mixed-voltage systems. It operates from 1.65 V to 5.5 V V_CC, delivers ±24 mA output drive at 3.0 V, and achieves 6.5 ns max propagation delay at 3.3 V.

For engineers reviewing the 74LCX240WMX datasheet, pinout, applications, or equivalent options, this device is selected for low-voltage logic interfacing where 5 V signal compatibility, high-speed bus buffering, and power-down high-impedance control are required in industrial and embedded designs.

Technical Context

The 74LCX240WMX implements dual independent 4-bit inverting buffers, each controlled by a dedicated 3-state enable input (OE1/OE2). Its advanced CMOS process enables rail-to-rail 5 V tolerance on all I/O pins while maintaining sub-7 ns propagation delay at 3.3 V operation.

It supports live insertion/withdrawal via power-down high-impedance inputs and outputs, and integrates proprietary noise/EMI reduction circuitry. Latch-up immunity exceeds 100 mA, and ESD withstand voltage exceeds 2000 V per Human Body Model.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65 V to 5.5 V - Enables interoperability across 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains without level shifters.
t_PD Max	6.5 ns at V_CC = 3.3 V - Supports high-speed bus timing in DDR memory interfaces and clock fanout applications.
I_OH/I_OL	±24 mA at V_CC = 3.0 V - Drives heavy capacitive loads (e.g., >30 pF) and multiple TTL/CMOS inputs directly.
5 V Tolerance	Inputs and outputs rated to 6.5 V absolute max - Allows safe connection to legacy 5 V buses without external protection.
I_CC Max	10 µA quiescent current - Minimizes standby power in battery-backed or energy-sensitive systems.
C_IN/C_OUT	7 pF / 8 pF typical - Reduces switching noise and improves signal integrity on high-frequency data lines.

Pinout & Package

74LCX240WMX is packaged in SOIC-20W (Case 751BJ), a 20-pin wide-body surface-mount package with 300-mil width and 1.27 mm pitch, compliant with JEDEC MS-013.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	OE1, OE2	Active-low 3-state enable inputs controlling first and second quad buffers independently.
2–9	I0–I7	Inverting input terminals for eight buffered channels (I0→O0, I1→O1, etc.).
11–18	O0–O7	Inverting buffered outputs, high-impedance when corresponding OE is high.
10, 20	GND, V_CC	Power supply reference and supply rail - decoupling capacitor placement critical for noise suppression.

Key Features

Feature	Design Value
5 V tolerant I/O	Enables direct interface between 3.3 V logic and 5 V peripherals without external level translators.
Power-down high-Z	Guarantees high-impedance state during power-up/down sequences when OE is pulled up, preventing bus contention.
Live insertion support	Allows hot-plug capability in backplane or modular systems due to controlled I/O behavior during V_CC ramp.
Noise/EMI reduction	Proprietary circuitry limits simultaneous switching output (SSO) noise, easing PCB layout and EMC compliance.
Latch-up immunity	Exceeds 100 mA per JESD78 - ensures robustness against transient overcurrent events in industrial environments.

Applications

Memory Address Buffering	Industrial Bus Transceiver
Use Scenario: Driving address lines from a low-voltage microcontroller to a 5 V SRAM or EPROM in mixed-voltage embedded systems. IC Role / Device Role / Timing Role: Inverting octal buffer providing level translation, fanout amplification, and timing-controlled tri-state isolation. Use Value: Eliminates need for discrete level shifters while maintaining <6.5 ns propagation delay for synchronous memory access timing.	Use Scenario: Bidirectional data conditioning on RS-485 or CAN physical layer buses where logic-level translation and noise immunity are critical. IC Role / Device Role / Timing Role: Direction-controlled line driver/receiver with 5 V tolerant I/O and ±24 mA drive strength for long trace routing. Use Value: Supports reliable signal integrity over 15 cm+ PCB traces at 10 MHz due to low C_OUT (8 pF) and EMI-reduction design.
Low-Power Clock Distribution	Hot-Swappable Module Interface
Use Scenario: Fanout of a 3.3 V system clock to multiple 5 V peripheral clocks in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Inverting clock buffer with precise skew control (<1.0 ns O-O skew at 3.3 V) and low jitter contribution. Use Value: Ensures deterministic clock edge alignment across multiple downstream devices, reducing setup/hold violations.	Use Scenario: Interfacing field-replaceable modules (e.g., I/O expansion cards) to a main controller board with live insertion capability. IC Role / Device Role / Timing Role: Tri-state isolator enabling safe module insertion/removal without disrupting active bus signals. Use Value: Prevents bus glitches and latch-up during hot-swap events via guaranteed high-Z I/O during V_CC ramp.

Memory Address Buffering

Industrial Bus Transceiver

Use Scenario: Driving address lines from a low-voltage microcontroller to a 5 V SRAM or EPROM in mixed-voltage embedded systems.

IC Role / Device Role / Timing Role: Inverting octal buffer providing level translation, fanout amplification, and timing-controlled tri-state isolation.

Use Value: Eliminates need for discrete level shifters while maintaining <6.5 ns propagation delay for synchronous memory access timing.

Use Scenario: Bidirectional data conditioning on RS-485 or CAN physical layer buses where logic-level translation and noise immunity are critical.

IC Role / Device Role / Timing Role: Direction-controlled line driver/receiver with 5 V tolerant I/O and ±24 mA drive strength for long trace routing.

Use Value: Supports reliable signal integrity over 15 cm+ PCB traces at 10 MHz due to low C_OUT (8 pF) and EMI-reduction design.

Low-Power Clock Distribution

Hot-Swappable Module Interface

Use Scenario: Fanout of a 3.3 V system clock to multiple 5 V peripheral clocks in programmable logic controllers (PLCs).

IC Role / Device Role / Timing Role: Inverting clock buffer with precise skew control (<1.0 ns O-O skew at 3.3 V) and low jitter contribution.

Use Value: Ensures deterministic clock edge alignment across multiple downstream devices, reducing setup/hold violations.

Use Scenario: Interfacing field-replaceable modules (e.g., I/O expansion cards) to a main controller board with live insertion capability.

IC Role / Device Role / Timing Role: Tri-state isolator enabling safe module insertion/removal without disrupting active bus signals.

Use Value: Prevents bus glitches and latch-up during hot-swap events via guaranteed high-Z I/O during V_CC ramp.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal inverting buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVC240APW,118	Lower V_CC min (1.65 V same), but only 3.6 V max I/O tolerance - no 5 V bus compatibility.	Suitable for pure 3.3 V systems; not for 5 V mixed-signal interconnect.	Select when full 5 V tolerance is unnecessary and cost or footprint is prioritized.
SN74LVCH240AQPWRQ1	Automotive-grade AEC-Q100 qualified; identical 1.65–5.5 V range and 5 V tolerance.	Required for automotive infotainment or ADAS domain controllers needing qualification.	Choose for automotive applications requiring temperature grade (-40°C to +125°C) and reliability validation.

Compared with 74LCX240WMX, the 74LVC240APW lacks 5 V bus interoperability, while SN74LVCH240AQPWRQ1 adds automotive qualification at higher cost-neither is pin-compatible, but both serve overlapping functional roles in distinct voltage or reliability contexts.

Availability

74LCX240WMX is available at Aetrix Electronics and suitable for memory subsystems, industrial bus interfaces, clock distribution networks, and hot-swappable module designs requiring stable component supply and long-term lifecycle support.

Supply support for 74LCX240WMX 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, logic, and sensor solutions for automotive, industrial, and cloud infrastructure markets.

The LCX family-including 74LCX240WMX-is engineered for low-voltage, high-speed logic interfacing in mixed-signal systems, emphasizing 5 V tolerance, low dynamic power, and robust ESD/latch-up performance.

FAQ

What is the maximum operating temperature range for the 74LCX240WMX?

The 74LCX240WMX is specified for operation from −40 °C to +125 °C ambient temperature, making it suitable for extended industrial environments such as factory automation controllers and outdoor telecom equipment where thermal stress is significant. This rating applies across its full 1.65 V to 5.5 V V_CC range and is validated per JEDEC JESD84-A standard testing.

Does the 74LCX240WMX require external pull-up resistors on OE pins?

Yes-the 74LCX240WMX datasheet specifies that OE pins must be tied to V_CC through a pull-up resistor during power-up/down to ensure high-impedance outputs. The minimum resistor value depends on the driver's sourcing capability; typical values range from 4.7 kΩ to 10 kΩ for 3.3 V systems. This prevents bus contention before system initialization completes.

Can the 74LCX240WMX drive a 50 pF load at 10 MHz without signal degradation?

Yes-the 74LCX240WMX drives 50 pF loads with measured VOLP of 0.8 V and VOLV of −0.8 V at 3.3 V V_CC, confirming clean switching under dynamic conditions. Its 25 pF power dissipation capacitance (CPD) and ±24 mA drive strength ensure stable edge rates and minimal overshoot/undershoot, meeting signal integrity requirements for 10 MHz bus operation.

Is the 74LCX240WMX RoHS compliant and lead-free?

Yes-the 74LCX240WMX is Pb-Free, Halogen Free/BFR Free, and fully RoHS compliant per EU Directive 2011/65/EU. The "G" suffix in the marking (e.g., AWLYYWWG) explicitly denotes the Pb-Free SOIC-20W package, and onsemi certifies conformance to IPC/JEDEC J-STD-609 for marking and material declarations.

How does the 74LCX240WMX differ from the 74LCX244 in system design?

The 74LCX240WMX provides inverting outputs (O0 = NOT I0), while the 74LCX244 offers non-inverting outputs. This functional difference dictates use cases: 74LCX240WMX is selected where signal polarity inversion is required (e.g., active-low address decoding), whereas 74LCX244 suits direct signal replication. Both share identical V_CC range, 5 V tolerance, and pinout structure-but cannot be substituted without logic redesign.

74LCX240WMX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LCX

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Buffer, Inverting

Number of Elements:: 2

Number of Bits per Element:: 4

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 24mA, 24mA

Voltage - Supply:: 2V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

74LCX240WMX FAQ

1.How can I place an order for 74LCX240WMX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LCX240WMX 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 74LCX240WMX reliable?

The price and inventory of 74LCX240WMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX240WMX is usually 5 days.

3.What payment methods are accepted for 74LCX240WMX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX240WMX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LCX240WMX?

74LCX240WMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LCX240WMX 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 74LCX240WMX?

For technical support, including 74LCX240WMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX240WMX requirements.

6.How does Aetrix verify that 74LCX240WMX is sourced from the original manufacturer or authorized distributors?

All 74LCX240WMX 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 74LCX240WMX meets industry standards.

7.What is the process for return or replacement of 74LCX240WMX?

All 74LCX240WMX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX240WMX, 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 74LCX240WMX part is unused and in its original packaging.

Return procedure for 74LCX240WMX:

1.Submit a request within 90 days.

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

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