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

onsemi 74LVT244MSAX

Name: 74LVT244MSAX
Brand: onsemi
SKU: 74LVT244MSAX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LVT244MSAX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74LVT244MSAX.pdf

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

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Product details

Overview

74LVT244MSAX from ON Semiconductor is a low-voltage octal buffer/line driver with 3-STATE outputs, designed for memory address and clock driving in 3.3V systems interfacing to 5V TTL buses. It features ±32mA/±64mA drive capability, operates from 2.7V–3.6V V_CC, supports –40°C to +85°C industrial temperature range, and uses advanced BiCMOS technology for high-speed, low-power operation.

For engineers reviewing the 74LVT244MSAX datasheet, pinout, applications, or equivalent options, key selection criteria include 3-STATE bus isolation, TTL-compatible input thresholds, output drive strength, power-up/down high-impedance behavior, and SSOP-20 package compatibility with dense PCB layouts.

Technical Context

The 74LVT244MSAX implements dual 4-bit non-inverting buffers with independent 3-STATE enable controls (OE1/OE2), enabling selective bus loading control. Its BiCMOS architecture delivers propagation delays as low as 1.1ns (t_PLH/t_PHL) at 3.3V while maintaining TTL-level input compatibility (V_IL = 0.8V, V_VIH = 2.0V) and robust ESD protection (>2000V HBM).

Unlike the bushold-equipped LVTH variant, the 74LVT244MSAX lacks internal bus-hold circuitry on inputs, requiring external pull-up/pull-down resistors for unused pins. It provides glitch-free bus loading during power sequencing via power-up/down high-impedance outputs and meets latch-up immunity >500mA per JEDEC JESD78.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7V–3.6V - Ensures stable operation across industrial 3.3V rail tolerances without overvoltage risk.
I_OH/I_OL	–32mA / +64mA - Drives heavy capacitive loads or multiple TTL inputs without external buffering.
t_PLH/t_PHL	1.1–3.8ns - Enables high-speed data transfer in memory and clock distribution paths up to ~250MHz.
Input Voltage Range	0V–5.5V - Allows direct connection to 5V logic without level shifters or clamping diodes.
Operating Temperature	–40°C to +85°C - Qualified for industrial-grade embedded and communications equipment.
Output Leakage (I_OZL/I_OZH)	±5µA - Minimizes standby current in 3-STATE-bus-hold configurations.
Power Supply Current (I_CCZ)	0.19mA - Ultra-low quiescent current when outputs disabled, critical for power-sensitive designs.

Pinout & Package

74LVT244MSAX is housed in a 20-lead Shrink Small Outline Package (SSOP), JEDEC MO-150 compliant, 5.3mm wide, with 0.65mm lead pitch and gull-wing terminations suitable for automated SMT assembly.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	OE1, OE2	Active-low 3-STATE enable inputs controlling first and second group of four outputs respectively.
2–9	I0–I7	Eight non-inverting data inputs; no internal bus-hold - external termination required for floating states.
11–18	O0–O7	Eight buffered, 3-STATE-capable outputs; each sinks 64mA or sources 32mA at V_CC = 3.3V.
10, 20	GND, V_CC	Dedicated ground and supply pins - decoupling capacitor placement near Pin 10/V_CC minimizes switching noise.

Key Features

Feature	Design Value
TTL interface at 3.3V V_CC	Accepts 0–5.5V inputs and drives 5V TTL loads directly - eliminates level translators in mixed-voltage systems.
Glitch-free power sequencing	Outputs remain high-impedance during power-up/down - prevents bus contention and system initialization faults.
High drive strength	±32mA/±64mA output current enables driving 10+ TTL loads or 50pF traces without signal degradation.
Low dynamic power	Typical I_CC = 0.19mA in 3-STATE mode - reduces system-level standby power in battery-backed or energy-efficient applications.
Robust ESD immunity	Human-body model >2000V - improves manufacturing yield and field reliability in handling-sensitive environments.

Applications

Memory Address Buffering	Clock Distribution
Use Scenario: Driving address lines from a 3.3V microcontroller to multiple 5V SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Non-inverting octal buffer providing voltage-level translation and fanout expansion with precise timing control. Use Value: Eliminates need for discrete level shifters while maintaining sub-4ns propagation delay for synchronous memory access timing.	Use Scenario: Distributing a system clock signal from a 3.3V oscillator to multiple 5V peripheral ICs with matched skew. IC Role / Device Role / Timing Role: Low-skew (≤1.0ns) line driver ensuring simultaneous clock edge arrival across multiple receivers. Use Value: Reduces clock jitter accumulation and maintains setup/hold margins in multi-chip timing-critical subsystems.
Bus Transceiver Interface	Industrial Control Backplane
Use Scenario: Isolating bidirectional data buses between 3.3V host processors and legacy 5V peripherals using discrete direction control. IC Role / Device Role / Timing Role: Unidirectional 3-STATE buffer enabling controlled bus access with fast enable/disable timing (t_PZH/t_PHZ ≤ 5.3ns). Use Value: Prevents bus contention during hot-swap or reconfiguration events while supporting high-throughput data bursts.	Use Scenario: Interfacing programmable logic controllers (PLCs) with 5V I/O modules via a 3.3V FPGA-based controller board. IC Role / Device Role / Timing Role: Robust octal driver delivering industrial-grade noise immunity and latch-up resistance (>500mA). Use Value: Ensures reliable signal integrity in electrically noisy factory-floor environments with minimal external protection components.

Memory Address Buffering

Clock Distribution

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

IC Role / Device Role / Timing Role: Non-inverting octal buffer providing voltage-level translation and fanout expansion with precise timing control.

Use Value: Eliminates need for discrete level shifters while maintaining sub-4ns propagation delay for synchronous memory access timing.

Use Scenario: Distributing a system clock signal from a 3.3V oscillator to multiple 5V peripheral ICs with matched skew.

IC Role / Device Role / Timing Role: Low-skew (≤1.0ns) line driver ensuring simultaneous clock edge arrival across multiple receivers.

Use Value: Reduces clock jitter accumulation and maintains setup/hold margins in multi-chip timing-critical subsystems.

Bus Transceiver Interface

Industrial Control Backplane

Use Scenario: Isolating bidirectional data buses between 3.3V host processors and legacy 5V peripherals using discrete direction control.

IC Role / Device Role / Timing Role: Unidirectional 3-STATE buffer enabling controlled bus access with fast enable/disable timing (t_PZH/t_PHZ ≤ 5.3ns).

Use Value: Prevents bus contention during hot-swap or reconfiguration events while supporting high-throughput data bursts.

Use Scenario: Interfacing programmable logic controllers (PLCs) with 5V I/O modules via a 3.3V FPGA-based controller board.

IC Role / Device Role / Timing Role: Robust octal driver delivering industrial-grade noise immunity and latch-up resistance (>500mA).

Use Value: Ensures reliable signal integrity in electrically noisy factory-floor environments with minimal external protection components.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVTH244MSA	Includes bus-hold inputs; eliminates need for external pull-up resistors on unused inputs.	Better suited for systems with dynamically configurable or partially used I/O banks.	Select when input termination overhead must be minimized and bus-hold functionality is acceptable.
SN74LVC244APWR	CMOS-based; lower ICC (10µA typical), but reduced drive (±24mA) and no 5V-tolerant inputs.	Requires external level shifting for 5V interfaces; optimized for ultra-low-power 3.3V-only systems.	Select only for 3.3V-only buses where power efficiency outweighs interface flexibility.

Compared with 74LVT244MSAX, the 74LVTH244MSA adds bus-hold for simplified layout but shares identical timing and drive specs, while SN74LVC244APWR trades 5V tolerance and drive strength for lower static power - making 74LVT244MSAX optimal for mixed-voltage industrial backplanes requiring robustness and speed.

Availability

74LVT244MSAX is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, bus transceiver interface, and industrial control backplane applications requiring stable component supply and long-term industrial lifecycle support.

Supply support for 74LVT244MSAX 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

ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and logic solutions for automotive, industrial, cloud, and consumer markets.

The 74LVT244MSAX belongs to ON Semiconductor's legacy LVT logic family, engineered for high-speed, low-voltage bus interfacing in mixed-signal embedded systems where 3.3V core logic must reliably communicate with 5V legacy peripherals.

FAQ

Is 74LVT244MSAX still in active production?

No - 74LVT244MSAX is marked DISCONTINUED and NOT RECOMMENDED FOR NEW DESIGN per ON Semiconductor documentation. However, Aetrix Electronics maintains strategic inventory and offers extended supply support, including last-time buy coordination and cross-reference guidance for legacy system maintenance and repair programs.

What package type does 74LVT244MSAX use?

74LVT244MSAX uses a 20-lead Shrink Small Outline Package (SSOP), JEDEC MO-150 compliant, 5.3mm wide, with 0.65mm lead pitch. This compact surface-mount package supports high-density PCB layouts and is compatible with standard reflow soldering profiles for automated assembly.

Does 74LVT244MSAX have bus-hold functionality on its inputs?

No - 74LVT244MSAX does not include bus-hold circuitry. Unlike the 74LVTH244MSA variant, it requires external pull-up or pull-down resistors on unused inputs to prevent floating states and ensure deterministic logic levels during system idle or configuration phases.

Can 74LVT244MSAX interface directly with 5V logic circuits?

Yes - 74LVT244MSAX features 5V-tolerant inputs (VI up to 5.5V) and outputs capable of driving TTL loads, enabling direct connection to 5V systems without level-shifting components. Its V_IL = 0.8V and V_VIH = 2.0V thresholds ensure reliable recognition of 5V logic levels when powered from 3.3V.

What is the maximum output current rating for 74LVT244MSAX?

74LVT244MSAX delivers ±32mA source current (I_OH) and +64mA sink current (I_OL) per output at V_CC = 3.3V. These ratings allow it to drive multiple TTL loads or moderate capacitive traces while maintaining specified VOL and VOH under worst-case conditions.

74LVT244MSAX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LVT

Package/Case:: 20-SSOP (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:: 32mA, 64mA

Voltage - Supply:: 2.7V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SSOP

74LVT244MSAX FAQ

1.How can I place an order for 74LVT244MSAX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LVT244MSAX 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 74LVT244MSAX reliable?

The price and inventory of 74LVT244MSAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT244MSAX is usually 5 days.

3.What payment methods are accepted for 74LVT244MSAX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT244MSAX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LVT244MSAX?

74LVT244MSAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LVT244MSAX 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 74LVT244MSAX?

For technical support, including 74LVT244MSAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT244MSAX requirements.

6.How does Aetrix verify that 74LVT244MSAX is sourced from the original manufacturer or authorized distributors?

All 74LVT244MSAX 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 74LVT244MSAX meets industry standards.

7.What is the process for return or replacement of 74LVT244MSAX?

All 74LVT244MSAX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT244MSAX, 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 74LVT244MSAX part is unused and in its original packaging.

Return procedure for 74LVT244MSAX:

1.Submit a request within 90 days.

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

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