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

Texas Instruments SN74LVT244BDWR

Name: SN74LVT244BDWR
Brand: Texas Instruments
SKU: SN74LVT244BDWR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVT244BDWR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: SN74LVT244BDWR.pdf

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

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Product details

Overview

SN74LVT244BDWR from Texas Instruments is a 3.3-V ABT octal buffer/driver with 3-state outputs, designed for mixed-mode signal operation between 5-V inputs and 3.3-V V_CC. It features dual 4-bit drivers with independent output-enable (OE) controls, supports hot insertion via I_off and power-up 3-state, and operates down to 2.7 V for unregulated battery systems. Used in bus interface and level-shifting applications in industrial control backplanes.

For engineers reviewing the SN74LVT244BDWR datasheet, SN74LVT244BDWR pinout, SN74LVT244BDWR application, or SN74LVT244BDWR equivalent, key selection criteria include 3.3-V supply compatibility with 5-V TTL interfacing, guaranteed hot-insertion support, low ground bounce (<0.8 V), and SOIC-20 package thermal performance (θ_JA = 58°C/W).

Technical Context

The SN74LVT244BDWR implements two independent 4-bit noninverting buffers, each controlled by a dedicated OE input (1OE and 2OE). When OE is low, data passes from A inputs to Y outputs; when high, outputs enter high-impedance state. The device uses Advanced BiCMOS Technology (ABT) for high-speed, low-noise operation.

Its I_off circuitry disables outputs during power-down to prevent backflow current, while power-up 3-state ensures outputs remain high-Z during V_CC ramp-up. Input voltage tolerance extends to 7 V, enabling direct connection to 5-V logic without external level shifters.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 3.6 V - supports unregulated battery operation and stable 3.3-V rail design
Input Voltage (VI)	−0.5 V to 7 V - enables direct 5-V TTL input interfacing without level shifters
t_PLH/t_PHL	1.1–3.5 ns at V_CC = 3.3 V - ensures sub-4 ns propagation for high-speed bus buffering
I_OL / I_OH	64 mA / −32 mA - drives standard TTL loads and multiple CMOS inputs reliably
V_OLP (Ground Bounce)	<0.8 V at V_CC = 3.3 V - minimizes noise coupling in dense PCB layouts
θ_JA (SOIC-DW)	58°C/W - defines thermal derating for continuous operation in industrial ambient
ESD Protection	2000-V HBM, 200-V MM, 1000-V CDM - meets robustness requirements for handling and board assembly

Pinout & Package

SN74LVT244BDWR is supplied in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 2.65 mm max height, with 1.27 mm lead pitch and gull-wing leads. Pin 1 index located at top-left corner with beveled edge marking.

Pin/Terminal	Circuit Role	Design Meaning
1OE, 2OE	Output-enable control inputs	Active-low enables respective 4-bit buffer sections; tie to V_CC via pullup for safe power-up
1A1–1A4, 2A1–2A4	Data inputs	Noninverting inputs for two independent 4-bit channels; tolerate up to 7 V
1Y1–1Y4, 2Y1–2Y4	3-state buffered outputs	Drive external buses; high-impedance when OE high prevents contention
V_CC (Pin 10)	Supply voltage	3.3-V nominal; supports operation down to 2.7 V for brownout resilience
GND (Pin 20)	Ground reference	Common return for all I/O and supply; critical for minimizing ground bounce

Key Features

Feature	Design Value
Mixed-mode 5-V/3.3-V interfacing	Accepts 5-V TTL inputs while powered from 3.3-V V_CC, eliminating external translators
Hot-insertion support	I_off and power-up 3-state prevent damage and bus contention during live card insertion
Low ground bounce	V_OLP < 0.8 V ensures signal integrity in multi-driver bus environments
Latch-up immunity	Exceeds 100 mA per JESD 78 Class II - suitable for harsh industrial environments
Wide operating temperature	−40°C to +85°C rating supports deployment in extended-temperature industrial systems

Applications

Industrial Backplane Interface	Embedded Controller Bus Expansion
Use Scenario: Interfacing a 3.3-V microcontroller to legacy 5-V peripheral cards on a DIN-rail mounted PLC backplane. IC Role / Device Role / Timing Role: Level-shifting octal buffer isolating voltage domains while preserving timing integrity across 20-cm ribbon cable runs. Use Value: Eliminates need for discrete level translators; 3.5 ns max propagation delay maintains synchronous bus timing at 50 MHz.	Use Scenario: Expanding GPIO count of an ARM-based HMI controller using a parallel address/data bus to drive LED matrix and keypad scan logic. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling shared memory-mapped I/O with configurable 3-state control per channel. Use Value: Dual OE inputs allow independent gating of upper/lower nibbles, reducing software overhead and bus arbitration latency.
Test Equipment Signal Routing	Automated Test Fixture I/O Conditioning
Use Scenario: Routing digital stimulus signals from a 3.3-V pattern generator to DUTs with mixed 3.3-V and 5-V logic families in ATE rack systems. IC Role / Device Role / Timing Role: Reconfigurable buffer stage providing voltage translation and output isolation during test sequence execution. Use Value: 7 V input tolerance and 64 mA drive strength ensure reliable signal delivery across variable load capacitances up to 100 pF.	Use Scenario: Conditioning control lines between a PXI chassis controller and custom sensor interface boards in production line test fixtures. IC Role / Device Role / Timing Role: Hot-pluggable I/O conditioner protecting host controller during module swap operations under power. Use Value: I_off and power-up 3-state guarantee zero current backflow and no bus glitches during field maintenance.

Industrial Backplane Interface

Embedded Controller Bus Expansion

Use Scenario: Interfacing a 3.3-V microcontroller to legacy 5-V peripheral cards on a DIN-rail mounted PLC backplane.

IC Role / Device Role / Timing Role: Level-shifting octal buffer isolating voltage domains while preserving timing integrity across 20-cm ribbon cable runs.

Use Value: Eliminates need for discrete level translators; 3.5 ns max propagation delay maintains synchronous bus timing at 50 MHz.

Use Scenario: Expanding GPIO count of an ARM-based HMI controller using a parallel address/data bus to drive LED matrix and keypad scan logic.

IC Role / Device Role / Timing Role: Bidirectional bus driver enabling shared memory-mapped I/O with configurable 3-state control per channel.

Use Value: Dual OE inputs allow independent gating of upper/lower nibbles, reducing software overhead and bus arbitration latency.

Test Equipment Signal Routing

Automated Test Fixture I/O Conditioning

Use Scenario: Routing digital stimulus signals from a 3.3-V pattern generator to DUTs with mixed 3.3-V and 5-V logic families in ATE rack systems.

IC Role / Device Role / Timing Role: Reconfigurable buffer stage providing voltage translation and output isolation during test sequence execution.

Use Value: 7 V input tolerance and 64 mA drive strength ensure reliable signal delivery across variable load capacitances up to 100 pF.

Use Scenario: Conditioning control lines between a PXI chassis controller and custom sensor interface boards in production line test fixtures.

IC Role / Device Role / Timing Role: Hot-pluggable I/O conditioner protecting host controller during module swap operations under power.

Use Value: I_off and power-up 3-state guarantee zero current backflow and no bus glitches during field maintenance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVTH244ADW	Lower drive strength (I_OL = 24 mA), higher t_P (max 5.5 ns), LVTH family with 2.7–3.6 V range	Suitable for lower-speed, lower-power applications where fanout is limited	Select when reduced power consumption and relaxed timing margins are acceptable
74ALVC244PW	3.3-V only (no 5-V tolerant inputs), smaller TSSOP-20 package, lower θ_JA (83°C/W)	Better suited for space-constrained portable designs with pure 3.3-V signaling	Choose when board area is critical and 5-V input compatibility is unnecessary

Compared with SN74LVTH244ADW and 74ALVC244PW, the SN74LVT244BDWR uniquely combines 5-V input tolerance, 64 mA drive, and hot-insertion capability in a standard SOIC-20 footprint-making it optimal for industrial backplane and mixed-voltage test equipment where reliability and interoperability are prioritized over minimal size or ultra-low power.

Availability

SN74LVT244BDWR is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded controller bus expansion requiring stable component supply and long-term manufacturability.

Supply support for SN74LVT244BDWR 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

Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions with emphasis on reliability, longevity, and industrial-grade performance.

The SN74LVT244BDWR belongs to TI's ABT logic family, engineered for high-speed, low-noise bus interface in mixed-voltage systems where interoperability between legacy 5-V and modern 3.3-V logic is essential.

FAQ

What is the maximum input voltage the SN74LVT244BDWR can tolerate?

The SN74LVT244BDWR supports an input voltage range of −0.5 V to 7 V, allowing direct connection to 5-V TTL logic without external level-shifting components. This specification is explicitly defined in the Absolute Maximum Ratings table and confirmed across recommended operating conditions, making the SN74LVT244BDWR ideal for mixed-voltage system integration where 5-V signals must interface with a 3.3-V supply domain.

Does the SN74LVT244BDWR support hot insertion, and how is it implemented?

Yes, the SN74LVT244BDWR supports hot insertion through two integrated features: I_off circuitry that disables outputs during power-down to prevent damaging current backflow, and power-up 3-state logic that holds outputs in high-impedance until V_CC stabilizes. These functions are verified per JESD 78 latch-up testing and documented in the device's functional description, ensuring safe live-card replacement in modular industrial systems.

What is the thermal performance of the SN74LVT244BDWR in its SOIC-DW package?

The SN74LVT244BDWR in the SOIC (DW) package has a junction-to-ambient thermal resistance (θ_JA) of 58°C/W, measured per JESD 51-7 on a standard 2-layer JEDEC test board. This value enables thermal design margin calculation for continuous operation at up to 85°C ambient when dissipating ≤120 mW - consistent with typical ICC values of 5 mA under full-load switching conditions.

Can unused inputs on the SN74LVT244BDWR be left floating?

No, all unused inputs on the SN74LVT244BDWR must be tied to V_CC or GND to ensure proper device operation and prevent increased ICC or erratic behavior. This requirement is specified in Note 5 of the Recommended Operating Conditions section and reinforced in TI application report SCBA004, which details risks of slow or floating CMOS inputs in ABT-family devices like the SN74LVT244BDWR.

What is the minimum V_CC required for functional operation of the SN74LVT244BDWR?

The SN74LVT244BDWR is fully specified to operate down to 2.7 V V_CC, supporting unregulated battery-powered systems such as portable test gear or remote sensors. At this voltage, parameters including t_PLH/t_PHL (max 3.8 ns), V_OH (min 2.4 V), and I_OL (64 mA) remain within datasheet limits - enabling robust functionality even during battery discharge cycles.

SN74LVT244BDWR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVT

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

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-SOIC

SN74LVT244BDWR FAQ

1.How can I place an order for SN74LVT244BDWR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVT244BDWR 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 SN74LVT244BDWR reliable?

The price and inventory of SN74LVT244BDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT244BDWR is usually 5 days.

3.What payment methods are accepted for SN74LVT244BDWR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVT244BDWR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LVT244BDWR?

SN74LVT244BDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVT244BDWR 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 SN74LVT244BDWR?

For technical support, including SN74LVT244BDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT244BDWR requirements.

6.How does Aetrix verify that SN74LVT244BDWR is sourced from the original manufacturer or authorized distributors?

All SN74LVT244BDWR 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 SN74LVT244BDWR meets industry standards.

7.What is the process for return or replacement of SN74LVT244BDWR?

All SN74LVT244BDWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT244BDWR, 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 SN74LVT244BDWR part is unused and in its original packaging.

Return procedure for SN74LVT244BDWR:

1.Submit a request within 90 days.

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

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