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

onsemi 74LVX240MX

Name: 74LVX240MX
Brand: onsemi
SKU: 74LVX240MX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LVX240MX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74LVX240MX.pdf

Description:: IC BUFFER INVERT 3.6V 20SOIC

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Product details

Overview

74LVX240MX from Fairchild Semiconductor is a low-voltage octal inverting buffer/line driver with dual 3-STATE output enables, operating from 2.0V to 3.6V supply, supporting 5V-tolerant inputs (up to 7V), and delivering ±4mA drive strength at 3.3V. It serves as a memory address or clock driver in mixed-voltage 3.3V/5V bus interfaces.

For engineers reviewing the 74LVX240MX datasheet, pinout, applications, or equivalent options, key selection criteria include 3-STATE timing skew (≤1.5ns), simultaneous switching noise immunity, input voltage translation capability, and SOIC-20 package compatibility with JEDEC MS-013 footprint.

Technical Context

The 74LVX240MX implements two independent 4-bit inverting buffer sections, each controlled by a dedicated 3-STATE enable (OE1/OE2). Its input structure supports TTL- and CMOS-level compatibility across 3.3V and 5V domains via 7V-tolerant inputs.

Propagation delays are specified at CL = 15pF and CL = 50pF loads, with tPLH/tPHL ≤7.5ns (typ) and tPZL/tPLZ ≤13.0ns (max) at VCC = 3.3V. Output-to-output skew is guaranteed ≤1.5ns under matched load conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	2.0V to 3.6V - Enables direct integration into 3.3V logic systems without level-shifting circuitry.
Input Voltage Tolerance	−0.5V to 7V - Allows safe interfacing of 5V signals into 3.3V systems without external clamping.
Output Drive	±4mA at VOL ≤0.44V / VOH ≥2.48V - Sufficient for driving standard CMOS loads and short PCB traces.
Propagation Delay	tPLH/tPHL ≤7.5ns (typ) at CL=15pF, VCC=3.3V - Supports >100MHz bus operation with margin.
3-STATE Enable/Disable	tPZH ≤10.5ns, tPLZ ≤13.0ns (max) at CL=50pF - Ensures clean bus arbitration timing in shared-data applications.
Output Skew	tOSLH/tOSHL ≤1.5ns - Minimizes timing uncertainty between parallel outputs during simultaneous switching.
Quiescent ICC	≤40µA at VCC=3.6V - Supports ultra-low static power in battery-backed or standby-mode subsystems.

Pinout & Package

74LVX240MX is supplied in a 20-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide (Package Number M20B), with standard pin pitch of 0.050" (1.27mm).

Pin/Terminal	Circuit Role	Design Meaning
1, 19	OE1, OE2	Active-Low 3-STATE enable inputs controlling outputs O0–O3 (OE1) and O4–O7 (OE2); independent control allows partial bus gating.
2–5, 11–14	I0–I3, I4–I7	Inverting input terminals - Each drives corresponding output with polarity inversion; 7V-tolerant for mixed-voltage interface.
6–9, 15–18	O0–O3, O4–O7	3-STATE inverting outputs - High-impedance state activated when respective OE is HIGH; compatible with wired-OR and bus-sharing topologies.
10	GND	Ground reference for all logic and output stages - Must be low-inductance connection to minimize switching noise coupling.
20	VCC	Positive supply rail - Decoupling capacitor (0.1µF ceramic) required within 10mm of this pin for stable AC performance.

Key Features

Feature	Design Value
5V-to-3.3V Input Translation	Enables direct connection of legacy 5V peripherals to modern 3.3V microcontrollers without external level shifters.
Guaranteed Simultaneous Switching Noise Immunity	Validated dynamic threshold and noise margin specs ensure reliable operation even with full 8-bit output switching.
Dual Independent 3-STATE Enables	Allows selective disabling of upper/lower nibbles - critical for time-multiplexed bus architectures and memory interleaving.
Low Dynamic Power Dissipation	CPD = 17pF enables predictable power estimation (PD ≈ CPD × VCC² × f) for thermal design in dense layouts.
JEDEC-Compliant SOIC-20 Footprint	Ensures drop-in replacement compatibility with existing PCB land patterns designed for industry-standard 20-pin SOIC logic devices.

Applications

Memory Address Buffering	Microcontroller Bus Interface
Use Scenario: Driving 8-bit address lines from a 3.3V microcontroller to a 5V SRAM or EPROM device. IC Role / Device Role / Timing Role: Inverting buffer with 5V-tolerant inputs and 3-STATE outputs isolates MCU pins while enabling shared address/data bus control. Use Value: Eliminates need for discrete level shifters and reduces BOM count; propagation delay ≤7.5ns ensures setup/hold timing compliance at 20MHz bus speeds.	Use Scenario: Interfacing a 3.3V FPGA I/O bank to legacy 5V peripheral logic on a mixed-voltage development board. IC Role / Device Role / Timing Role: Voltage-translating line driver providing bidirectional signal conditioning and bus contention protection via 3-STATE control. Use Value: Dual OE pins allow FPGA to gate individual 4-bit segments, reducing bus turnaround latency versus full-bus drivers.
Clock Distribution Network	Industrial Control Backplane
Use Scenario: Fan-out of a 3.3V system clock to multiple 5V logic devices (e.g., counters, latches) with matched edge timing. IC Role / Device Role / Timing Role: Low-skew inverting clock buffer ensuring <1.5ns inter-output skew across all eight outputs. Use Value: Maintains deterministic clock arrival times across distributed logic blocks, preventing metastability in synchronous designs.	Use Scenario: Isolating PLC I/O module data lines from a central 3.3V controller in an electrically noisy factory environment. IC Role / Device Role / Timing Role: Robust line driver with high noise immunity, 7V input tolerance, and 3-STATE capability for hot-swap-safe backplane communication. Use Value: Withstands ESD transients up to ±20mA and operates reliably from −40°C to +85°C, meeting industrial temperature requirements.

Memory Address Buffering

Microcontroller Bus Interface

Use Scenario: Driving 8-bit address lines from a 3.3V microcontroller to a 5V SRAM or EPROM device.

IC Role / Device Role / Timing Role: Inverting buffer with 5V-tolerant inputs and 3-STATE outputs isolates MCU pins while enabling shared address/data bus control.

Use Value: Eliminates need for discrete level shifters and reduces BOM count; propagation delay ≤7.5ns ensures setup/hold timing compliance at 20MHz bus speeds.

Use Scenario: Interfacing a 3.3V FPGA I/O bank to legacy 5V peripheral logic on a mixed-voltage development board.

IC Role / Device Role / Timing Role: Voltage-translating line driver providing bidirectional signal conditioning and bus contention protection via 3-STATE control.

Use Value: Dual OE pins allow FPGA to gate individual 4-bit segments, reducing bus turnaround latency versus full-bus drivers.

Clock Distribution Network

Industrial Control Backplane

Use Scenario: Fan-out of a 3.3V system clock to multiple 5V logic devices (e.g., counters, latches) with matched edge timing.

IC Role / Device Role / Timing Role: Low-skew inverting clock buffer ensuring <1.5ns inter-output skew across all eight outputs.

Use Value: Maintains deterministic clock arrival times across distributed logic blocks, preventing metastability in synchronous designs.

Use Scenario: Isolating PLC I/O module data lines from a central 3.3V controller in an electrically noisy factory environment.

IC Role / Device Role / Timing Role: Robust line driver with high noise immunity, 7V input tolerance, and 3-STATE capability for hot-swap-safe backplane communication.

Use Value: Withstands ESD transients up to ±20mA and operates reliably from −40°C to +85°C, meeting industrial temperature requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal inverting buffer with 3-STATE applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVC240PW,118	Lower VCC range (1.65V–3.6V); higher drive (±24mA); smaller TSSOP-20 package (4.4mm)	Better suited for space-constrained portable designs requiring higher current drive	Select if board layout allows TSSOP and higher sink/source capability is needed
SN74LV240ADW	Same SOIC-20 package; non-inverting logic; 1.65V–5.5V VCC; no 5V-tolerant inputs	Requires external level shifting for 5V interface; preferred where signal polarity must be preserved	Select only when inverting function is not required and 5V input tolerance is unnecessary

Compared with 74LVC240PW,118 and SN74LV240ADW, the 74LVX240MX uniquely combines 7V input tolerance, inverting logic, and JEDEC SOIC-20 compatibility - making it optimal for retrofitting legacy 5V systems with 3.3V controllers while preserving existing PCB footprints and signal polarity requirements.

Availability

74LVX240MX is available at Aetrix Electronics and suitable for memory address buffering, microcontroller bus interfacing, and clock distribution applications requiring stable component supply, long-term industrial lifecycle support, and consistent SOIC-20 packaging.

Supply support for 74LVX240MX 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 U.S.-based semiconductor company specializing in analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing systems.

The LVX logic family, including the 74LVX240MX, was engineered for low-voltage 3.3V operation with backward-compatible 5V input tolerance - targeting cost-sensitive, high-density board designs in computing, communications, and industrial control.

FAQ

What is the maximum input voltage rating for the 74LVX240MX?

The 74LVX240MX supports DC input voltages from −0.5V to 7.0V, enabling safe interfacing with 5V logic signals in 3.3V systems without external protection components. This 7V tolerance is verified across the full operating temperature range (−40°C to +85°C) and applies to all input pins (I0–I7, OE1, OE2). Exceeding 7V may damage the internal input clamp diodes.

Does the 74LVX240MX support true 3-STATE operation on all eight outputs?

Yes, the 74LVX240MX provides true 3-STATE (high-impedance) operation on all eight outputs (O0–O7), controlled independently by two active-low enables: OE1 governs O0–O3 and OE2 governs O4–O7. When either OE is HIGH, its associated four outputs enter high-impedance mode with off-state current ≤±2.5µA at VCC = 3.6V, as specified in the DC Electrical Characteristics table.

What is the typical propagation delay of the 74LVX240MX at 3.3V supply?

At VCC = 3.3V ±0.3V and CL = 15pF, the 74LVX240MX exhibits typical propagation delays of tPLH = 4.3ns and tPHL = 6.8ns. These values are measured under standard test conditions defined in the AC Electrical Characteristics table and represent average performance across process/voltage/temperature corners - not guaranteed minimum/maximum limits.

Is the 74LVX240MX pin-compatible with other 20-pin octal buffers in SOIC packages?

The 74LVX240MX uses JEDEC MS-013 compliant SOIC-20 pinout (Package Number M20B), matching mechanical and electrical pin assignments of industry-standard 20-pin octal buffers like the 74LS240 and 74HC240. However, logic polarity (inverting), supply voltage range (2.0–3.6V), and 5V-tolerant inputs are unique to the LVX family - electrical compatibility requires verification of system-level voltage and timing constraints.

What is the recommended decoupling for the 74LVX240MX VCC pin?

A 0.1µF ceramic capacitor placed within 10mm of the 74LVX240MX VCC pin (Pin 20) and GND (Pin 10) is required to suppress high-frequency switching noise and maintain stable core voltage during output transitions. For systems with heavy simultaneous switching, adding a bulk 4.7µF tantalum or aluminum electrolytic capacitor nearby further improves low-frequency regulation and reduces supply droop.

74LVX240MX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LVX

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:: 4mA, 4mA

Voltage - Supply:: 2V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

74LVX240MX FAQ

1.How can I place an order for 74LVX240MX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LVX240MX 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 74LVX240MX reliable?

The price and inventory of 74LVX240MX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVX240MX is usually 5 days.

3.What payment methods are accepted for 74LVX240MX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVX240MX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LVX240MX?

74LVX240MX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LVX240MX 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 74LVX240MX?

For technical support, including 74LVX240MX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVX240MX requirements.

6.How does Aetrix verify that 74LVX240MX is sourced from the original manufacturer or authorized distributors?

All 74LVX240MX 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 74LVX240MX meets industry standards.

7.What is the process for return or replacement of 74LVX240MX?

All 74LVX240MX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVX240MX, 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 74LVX240MX part is unused and in its original packaging.

Return procedure for 74LVX240MX:

1.Submit a request within 90 days.

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

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