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

NXP Semiconductors 74LVT244BDB,118

Name: 74LVT244BDB,118
Brand: NXP Semiconductors
SKU: 74LVT244BDB,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LVT244BDB,118

Manufacturer:: NXP Semiconductors

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: 74LVT244BDB,118.pdf

Description:: IC BUFF/DVR TRI-ST DUAL 20SSOP

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Product details

Overview

74LVT244BDB,118 from Nexperia is a 3.3 V octal 3-state buffer/line driver in SO20 (SOT163-1) package, featuring dual independent 4-bit channels with active-low output enables (1OE, 2OE), ±32 mA/±64 mA drive capability, bus-hold inputs eliminating external pull-ups, and 5.5 V overvoltage-tolerant inputs for mixed-voltage interfacing in industrial backplane systems.

For engineers reviewing the 74LVT244BDB,118 datasheet, 74LVT244BDB,118 pinout, 74LVT244BDB,118 application, or 74LVT244BDB,118 equivalent, this device supports high-speed 3.3 V logic interfacing with TTL compatibility, live insertion, power-up 3-state, and IOFF partial power-down-critical for hot-swap I/O expansion and legacy bus bridging.

Technical Context

This BiCMOS octal buffer implements two independent 4-bit 3-state output groups controlled by separate active-low enables (1OE on Pin 1, 2OE on Pin 19), enabling flexible channel gating in shared-bus architectures. Each group drives four outputs (1Y0–1Y3 and 2Y0–2Y3) with rail-to-rail input tolerance up to 5.5 V and guaranteed 2.0 V VIH at 2.7 V VCC.

Its bus-hold circuitry maintains stable logic states on unused inputs without external resistors, while IOFF protection limits leakage to ±100 μA when VCC = 0 V-ensuring safe operation during power sequencing. Propagation delays are as low as 1.1 ns (tPLH) and 1.3 ns (tPHL) at 3.3 V, supporting >200 MHz data rates in point-to-point or stubbed bus topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	2.7 V to 3.6 V - Enables stable operation across wide 3.3 V supply tolerances, including noisy industrial rails.
IOH/IOL	-32 mA / +64 mA - Drives heavy capacitive loads (e.g., 50 pF buses) and interfaces directly with 5 V TTL without level shifters.
tPLH/tPHL	1.1 ns / 1.3 ns (typ @ 3.3 V) - Supports sub-5 ns cycle times for high-throughput address/data latching in FPGA/CPU peripheral interfaces.
VIH/VIL	2.0 V / 0.8 V - Guarantees reliable TTL-level recognition even at minimum VCC (2.7 V), preventing false toggling in marginal conditions.
Bus Hold Current	IBHL = 75–130 μA, IBHH = -140 to -75 μA - Actively holds floating inputs at valid logic levels, removing need for 10 kΩ pull-ups on unused A-lines.
IOFF Leakage	±100 μA @ VCC = 0 V - Prevents back-driving of powered subsystems during hot-plug events or partial power-down modes.
ESD Rating	HBM > 2000 V, CDM > 1000 V - Survives handling and board assembly without special ESD controls in standard manufacturing environments.

Pinout & Package

74LVT244BDB,118 is housed in a plastic small outline package (SO20, SOT163-1) with 20 leads, 7.5 mm body width, and standard 1.27 mm lead pitch. The package supports reflow soldering per JEDEC J-STD-020 and is RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	1OE, 2OE	Active-low enable inputs controlling Y0–Y3 groups independently-enables time-multiplexed bus sharing between two peripherals.
2, 4, 6, 8	1A0–1A3	Data inputs for first 4-bit channel-accepts 0–5.5 V signals, allowing direct connection to 5 V microcontrollers.
11, 13, 15, 17	2A0–2A3	Data inputs for second 4-bit channel-electrically isolated from 1Ax group, supporting dual-bus isolation.
12, 14, 16, 18	1Y0–1Y3	3-state outputs for first channel-high-impedance state activated when 1OE = HIGH, preventing bus contention.
3, 5, 7, 9	2Y0–2Y3	3-state outputs for second channel-outputs sink up to 64 mA or source 32 mA, driving LEDs or bus transceivers directly.
10	GND	Ground reference for all I/O and internal logic-must be low-inductance connection to minimize ground bounce in fast switching.
20	VCC	3.3 V supply input-requires local 100 nF ceramic decoupling within 5 mm to suppress high-frequency noise from output switching.

Key Features

Feature	Design Value
Dual independent 4-bit 3-state control	Separate OE pins allow interleaved access to two 4-bit data paths on a single bus-reducing PCB routing complexity vs. two discrete quad buffers.
Overvoltage-tolerant inputs (up to 5.5 V)	Enables direct interface with 5 V legacy logic without external level translators-simplifies mixed-voltage system integration.
Bus-hold inputs	Eliminates need for 10 kΩ pull-up/pull-down resistors on unused inputs-reduces BOM count, board area, and risk of floating node oscillation.
Power-up 3-state and IOFF protection	Outputs remain high-impedance during power ramp-up and isolate powered sections when VCC is off-prevents back-powering and latch-up.
Live insertion/extraction support	Guaranteed safe hot-plug operation in modular backplanes-no sequencing required between VCC and signal lines during card replacement.

Applications

Industrial Backplane Interface

FPGA I/O Expansion

Use Scenario: Interfacing a 3.3 V FPGA to a legacy 5 V ISA-style backplane with shared address/data bus and multiple slot peripherals.

IC Role / Device Role / Timing Role: Bidirectional 3-state buffer isolating FPGA I/O from bus loading; provides voltage translation and contention-free bus arbitration via OE timing.

Use Value: Eliminates discrete level shifters and pull-up networks, reducing component count by 12+ parts per slot while maintaining <3.5 ns propagation delay for 25 MHz bus timing.

Use Scenario: Expanding GPIO count on a Xilinx Artix-7 FPGA used in test equipment requiring 32 programmable digital I/O lines with 5 V tolerance.

IC Role / Device Role / Timing Role: Octal buffer providing drive strength beyond FPGA's native I/O (64 mA sink vs. 24 mA FPGA max), with bus-hold preserving state during configuration reload.

Use Value: Enables direct 5 V peripheral control (relays, displays) without external drivers; bus-hold prevents glitches during partial reconfiguration cycles.

Hot-Swap PCIe Slot Adapter

Automated Test Equipment (ATE) Signal Routing

Use Scenario: Adding hot-pluggable PCIe add-in cards to an industrial controller where main board remains powered during field upgrades.

IC Role / Device Role / Timing Role: Isolating PCIe sideband signals (CLKREQ#, PERST#) and SMBus lines between host and card; IOFF prevents backfeed during insertion.

Use Value: Meets PCIe hot-plug specification for signal isolation; power-up 3-state ensures no spurious asserts on PERST# during card power ramp.

Use Scenario: Routing 16-channel digital stimulus/response signals between ATE pattern generator and DUT under test with variable voltage requirements (1.8 V to 5 V).

IC Role / Device Role / Timing Role: Level-agile buffer stage accepting 5 V inputs from legacy pattern generators and driving 3.3 V DUT I/O with precise timing control via OE strobing.

Use Value: Achieves <1 ns skew across all 8 bits, enabling synchronized multi-pin testing at 100 MHz; overvoltage tolerance avoids damage from accidental 5 V misconnection.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVTH244BD,118	Higher drive (+64 mA sink, -32 mA source) and improved tPLH/tPHL (1.1/1.3 ns vs. 1.2/1.4 ns); identical pinout and bus-hold.	Preferred for high-capacitance (>75 pF) or high-speed (>150 MHz) buses where margin is critical.	Select when maximum speed and drive are required; otherwise 74LVT244BDB,118 offers identical functionality at lower cost.
SN74LVC244APWR	Lower VCC range (1.65–3.6 V); no bus-hold; 24 mA/24 mA drive; 5 V tolerant inputs only with VCC ≥ 2.3 V.	Suitable for ultra-low-voltage designs but requires external pull-ups and cannot replace 74LVT244BDB,118 in 2.7 V-only or bus-hold-dependent systems.	Choose only if operating below 2.7 V or cost sensitivity outweighs bus-hold convenience and drive strength.

Compared with 74LVTH244BD,118, the 74LVT244BDB,118 trades minimal speed margin (0.1 ns) for proven reliability in long-lifecycle industrial deployments; versus SN74LVC244APWR, it delivers essential bus-hold and higher drive without external components-reducing design risk in unattended systems.

Availability

74LVT244BDB,118 is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA I/O expansion, hot-swap PCIe adapters, and automated test equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 74LVT244BDB,118 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

Nexperia is a global semiconductor expert delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in industrial, automotive, and computing applications.

The 74LVT series targets high-speed 3.3 V logic interfacing with robust mixed-voltage compatibility, designed specifically for backplane, FPGA, and hot-plug I/O expansion where signal integrity and power sequencing safety are critical.

FAQ

Can 74LVT244BDB,118 safely interface with 5 V microcontrollers?

Yes. Its inputs tolerate up to 5.5 V regardless of VCC level, and its outputs drive 5 V TTL loads directly due to overvoltage-tolerant design and ±32 mA/±64 mA drive strength. No level-shifting circuitry is needed, and bus-hold eliminates floating-input risks when MCU pins are unconnected.

Does 74LVT244BDB,118 support hot-plug insertion?

Yes. It features live insertion/extraction support, power-up 3-state, and IOFF circuitry that limits leakage to ±100 μA when VCC = 0 V. These ensure no back-driving, latch-up, or signal corruption during card insertion into a powered backplane-meeting industrial hot-swap requirements.

What is the purpose of bus-hold inputs on this device?

Bus-hold circuitry actively maintains the last-valid logic state on unused inputs using weak feedback transistors (IBHL = 75–130 μA, IBHH = −140 to −75 μA), eliminating the need for external 10 kΩ pull-up or pull-down resistors. This reduces BOM cost, PCB area, and potential noise coupling from resistor networks.

How does the dual OE architecture improve system design?

Independent 1OE (Pin 1) and 2OE (Pin 19) enable time-multiplexed access to two 4-bit data paths on a shared bus. This allows one buffer to manage address lines while the other handles data-reducing gate count versus two discrete quad buffers and simplifying timing-critical OE strobe generation in FPGA-based controllers.

74LVT244BDB,118 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Logic Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Input Type:: -

Output Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

74LVT244BDB,118 FAQ

1.How can I place an order for 74LVT244BDB,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LVT244BDB,118 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 74LVT244BDB,118 reliable?

The price and inventory of 74LVT244BDB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT244BDB,118 is usually 5 days.

3.What payment methods are accepted for 74LVT244BDB,118?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT244BDB,118 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LVT244BDB,118?

74LVT244BDB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LVT244BDB,118 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 74LVT244BDB,118?

For technical support, including 74LVT244BDB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT244BDB,118 requirements.

6.How does Aetrix verify that 74LVT244BDB,118 is sourced from the original manufacturer or authorized distributors?

All 74LVT244BDB,118 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 74LVT244BDB,118 meets industry standards.

7.What is the process for return or replacement of 74LVT244BDB,118?

All 74LVT244BDB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT244BDB,118, 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 74LVT244BDB,118 part is unused and in its original packaging.

Return procedure for 74LVT244BDB,118:

1.Submit a request within 90 days.

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

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