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

onsemi MC74LVX244MELG

Name: MC74LVX244MELG
Brand: onsemi
SKU: MC74LVX244MELG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC74LVX244MELG

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.209", 5.30mm Width)

Datasheet:: MC74LVX244MELG.pdf

Description:: IC BUF NON-INVERT 3.6V SOEIAJ-20

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Product details

Overview

MC74LVX244MELG from onsemi is an advanced high-speed CMOS octal non-inverting 3-state bus buffer with dual active-low output enables and 5 V-tolerant inputs. It operates from 2.0 V to 3.6 V, delivers 4.7 ns typical propagation delay at 3.3 V, supports ±25 mA output drive, and interfaces 5.0 V systems to 3.0 V logic in memory address/data bus applications.

For engineers reviewing the MC74LVX244MELG datasheet, pinout, applications, or equivalent options, key selection criteria include 5 V input tolerance, dual independent 3-state control, SOIC-20 package compatibility, low-noise output switching (VOLP ≤ 0.8 V), and guaranteed operation across −40 °C to +85 °C.

Technical Context

The MC74LVX244MELG implements two independent 4-bit non-inverting buffers, each controlled by its own active-low output enable (1OE, 2OE). All eight inputs tolerate up to 6.5 V, enabling safe interfacing between mixed-voltage domains without level shifters.

Its 3-state outputs exhibit balanced propagation delays (tPLH/tPHL skew ≤ 1.5 ns), low dynamic noise (VOLP ≤ 0.8 V), and power-down input protection. The device meets ESD standards (>2000 V HBM) and latch-up immunity (>300 mA), supporting robust industrial bus interface designs.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	2.0 V to 3.6 V - Enables direct use in 3.3 V systems with margin for supply variation.
Input Voltage Tolerance	−0.5 V to +6.5 V - Allows connection to 5 V buses without external clamping or translation.
tPD (Typ)	4.7 ns at VCC = 3.3 V - Supports >100 MHz bus timing in high-speed digital systems.
IOUT (per pin)	±25 mA - Drives standard TTL loads and multiple CMOS inputs without buffering.
Operating Temperature	−40 °C to +85 °C - Qualified for industrial-grade embedded and automotive body electronics.
VOL (Max)	0.44 V at IOL = 4 mA - Ensures reliable low-level logic recognition under full load.
VIH/VIL	2.0 V / 0.8 V at VCC = 3.3 V - Provides 0.5 V noise margin for clean signal interpretation.

Pinout & Package

MC74LVX244MELG is supplied in a 20-pin SOIC package (Case 751D), 7.6 mm × 12.95 mm footprint, 2.65 mm max height, with 1.27 mm pitch and Pb-free finish.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	Output Enable (1OE, 2OE)	Active-low enables for Group 1 (pins 2–9) and Group 2 (pins 11–18) outputs; both must be low for output drive.
2, 4, 6, 8, 11, 13, 15, 17	Data Inputs (1D0–1D3, 2D0–2D3)	Eight buffered inputs tolerant to 6.5 V; no external pull-ups required in mixed-voltage environments.
3, 5, 7, 9, 12, 14, 16, 18	3-State Outputs (1O0–1O3, 2O0–2O3)	High-impedance state activated when respective OE is high; outputs float cleanly during bus arbitration.
10, 20	GND, VCC	Power pins decoupled per JEDEC SOIC-20 layout; VCC must be bypassed locally for noise-sensitive operation.

Key Features

Feature	Design Value
5 V-tolerant inputs	Supports direct connection to legacy 5 V buses while powered from 3.3 V, eliminating level translators in mixed-supply systems.
Balanced propagation delays	≤1.5 ns inter-output skew ensures simultaneous data valid windows across all eight outputs for synchronous bus transfers.
Low-noise switching	VOLP ≤ 0.8 V reduces ground bounce and crosstalk in dense PCB layouts with shared return paths.
Power-down input protection	Prevents current flow into powered-off sections when VCC = 0 V, protecting upstream drivers during partial system power-down.

Applications

Memory Address Buffering	Microcontroller Bus Expansion
Use Scenario: Driving address lines from a 3.3 V microcontroller to multiple 5 V SRAM or EPROM devices on a shared bus. IC Role / Device Role / Timing Role: Non-inverting octal buffer with independent group enables, providing voltage-level compatible, low-skew address distribution. Use Value: Eliminates need for discrete level shifters; maintains setup/hold timing integrity across all eight address bits.	Use Scenario: Expanding GPIO count of an ARM Cortex-M3 MCU to control peripheral select lines in a multi-chip industrial controller. IC Role / Device Role / Timing Role: 3-state bus driver enabling time-multiplexed access to multiple peripherals via shared control bus. Use Value: Dual OE pins allow independent gating of two 4-bit peripheral groups, reducing software overhead and bus contention.
Industrial PLC I/O Module	Digital Signal Processor Interface
Use Scenario: Isolating and buffering digital I/O signals between a 3.3 V FPGA and 5 V optocoupler-based field I/O cards. IC Role / Device Role / Timing Role: Voltage-tolerant bus buffer with ESD-hardened inputs, placed between isolation barrier and logic side. Use Value: Withstands repeated hot-plug transients and meets IEC 61000-4-2 Level 3 (±8 kV contact) due to >2000 V HBM rating.	Use Scenario: Interfacing a TI C6748 DSP's EMIF to external SDRAM operating at 5 V logic levels. IC Role / Device Role / Timing Role: High-speed data/address line repeater ensuring signal integrity across long traces on a multilayer board. Use Value: 4.7 ns tPD and <1.5 ns skew preserve DDR timing margins; 6 pF max output capacitance minimizes trace loading.

Memory Address Buffering

Microcontroller Bus Expansion

Use Scenario: Driving address lines from a 3.3 V microcontroller to multiple 5 V SRAM or EPROM devices on a shared bus.

IC Role / Device Role / Timing Role: Non-inverting octal buffer with independent group enables, providing voltage-level compatible, low-skew address distribution.

Use Value: Eliminates need for discrete level shifters; maintains setup/hold timing integrity across all eight address bits.

Use Scenario: Expanding GPIO count of an ARM Cortex-M3 MCU to control peripheral select lines in a multi-chip industrial controller.

IC Role / Device Role / Timing Role: 3-state bus driver enabling time-multiplexed access to multiple peripherals via shared control bus.

Use Value: Dual OE pins allow independent gating of two 4-bit peripheral groups, reducing software overhead and bus contention.

Industrial PLC I/O Module

Digital Signal Processor Interface

Use Scenario: Isolating and buffering digital I/O signals between a 3.3 V FPGA and 5 V optocoupler-based field I/O cards.

IC Role / Device Role / Timing Role: Voltage-tolerant bus buffer with ESD-hardened inputs, placed between isolation barrier and logic side.

Use Value: Withstands repeated hot-plug transients and meets IEC 61000-4-2 Level 3 (±8 kV contact) due to >2000 V HBM rating.

Use Scenario: Interfacing a TI C6748 DSP's EMIF to external SDRAM operating at 5 V logic levels.

IC Role / Device Role / Timing Role: High-speed data/address line repeater ensuring signal integrity across long traces on a multilayer board.

Use Value: 4.7 ns tPD and <1.5 ns skew preserve DDR timing margins; 6 pF max output capacitance minimizes trace loading.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC244APWR	Same 20-pin TSSOP package; 3.6 V max VCC; 5 V-tolerant inputs; slightly higher ICC (max 10 µA vs. 4 µA)	Lower profile (1.2 mm vs. 2.65 mm); better for space-constrained boards but requires reflow-compatible layout	Select when board real estate is limited and TSSOP assembly capability exists.
74LVX244M	Identical electrical specs and pinout; obsolete marking variant (non-Pb-free, SOIC-20); no RoHS compliance	Not suitable for new designs requiring lead-free manufacturing or EU market compliance	Avoid for new production; only acceptable for legacy repair or non-regulated markets.

Compared with SN74LVC244APWR and 74LVX244M, the MC74LVX244MELG offers the lowest quiescent current (4 µA max), Pb-free SOIC-20 packaging, and proven industrial temperature range support-making it optimal for cost-sensitive, thermally demanding, and RoHS-compliant industrial control designs.

Availability

MC74LVX244MELG is available at Aetrix Electronics and suitable for industrial PLCs, microcontroller bus expansion, memory subsystems, and digital signal processor interfaces requiring stable component supply and long-term lifecycle assurance.

Supply support for MC74LVX244MELG 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The MC74LVX244MELG belongs to onsemi's LVX low-voltage logic family, designed specifically for mixed-voltage system interfacing where 3.3 V logic must reliably communicate with legacy 5 V components without external translation circuitry.

FAQ

What is the maximum input voltage the MC74LVX244MELG can tolerate?

The MC74LVX244MELG supports DC input voltages from −0.5 V to +6.5 V, enabling safe interfacing with 5 V logic while powered from a 3.3 V supply. This 5 V-tolerance eliminates the need for external level-shifting components in mixed-voltage bus architectures. The specification is guaranteed across the full operating temperature range (−40 °C to +85 °C) and applies to all eight inputs.

Does the MC74LVX244MELG support independent control of its two output groups?

Yes, the MC74LVX244MELG features two active-low output enables: 1OE controls outputs 1O0–1O3 (pins 3, 5, 7, 9), and 2OE controls outputs 2O0–2O3 (pins 12, 14, 16, 18). This allows independent 4-bit bus gating-critical for time-multiplexed peripheral access or segmented memory addressing without software overhead.

What is the typical propagation delay of the MC74LVX244MELG at 3.3 V?

The MC74LVX244MELG delivers a typical propagation delay (tPD) of 4.7 ns at VCC = 3.3 V with CL = 15 pF. This value is measured under standard AC test conditions and supports reliable operation in systems with clock frequencies exceeding 100 MHz, provided trace lengths and loading remain within design limits.

Is the MC74LVX244MELG RoHS compliant and Pb-free?

Yes, the MC74LVX244MELG is Pb-free and fully RoHS compliant, as confirmed by onsemi's marking "G" suffix and documentation in the official datasheet (Rev. 5, October 2024). It meets EU Directive 2011/65/EU and is suitable for environmentally regulated markets including automotive and industrial equipment sold in the European Union.

What package type is used for the MC74LVX244MELG?

The MC74LVX244MELG is packaged in a 20-pin SOIC (Small Outline Integrated Circuit) with case outline 751D, measuring 7.6 mm × 12.95 mm and featuring 1.27 mm pitch. This industry-standard package supports automated pick-and-place assembly and is compatible with IPC-7351B land patterns for reliable solder joint formation.

MC74LVX244MELG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LVX

Package/Case:: 20-SOIC (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Buffer, Non-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:: SOEIAJ-20

MC74LVX244MELG FAQ

1.How can I place an order for MC74LVX244MELG through Aetrix?

Please submit a Request for Quotation (RFQ) for MC74LVX244MELG 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 MC74LVX244MELG reliable?

The price and inventory of MC74LVX244MELG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74LVX244MELG is usually 5 days.

3.What payment methods are accepted for MC74LVX244MELG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74LVX244MELG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC74LVX244MELG?

MC74LVX244MELG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC74LVX244MELG 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 MC74LVX244MELG?

For technical support, including MC74LVX244MELG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74LVX244MELG requirements.

6.How does Aetrix verify that MC74LVX244MELG is sourced from the original manufacturer or authorized distributors?

All MC74LVX244MELG 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 MC74LVX244MELG meets industry standards.

7.What is the process for return or replacement of MC74LVX244MELG?

All MC74LVX244MELG units undergo pre-shipment inspection (PSI). If there is an issue with MC74LVX244MELG, 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 MC74LVX244MELG part is unused and in its original packaging.

Return procedure for MC74LVX244MELG:

1.Submit a request within 90 days.

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

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