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

Texas Instruments SN74LV240DWR

Name: SN74LV240DWR
Brand: Texas Instruments
SKU: SN74LV240DWR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LV240DWR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: SN74LV240DWR.pdf

Description:: BUS DRIVER

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Product details

Overview

SN74LV240DWR from Texas Instruments is an octal 3-state inverting buffer/driver IC designed for 2.7-V to 5.5-V V_CC operation, used in memory address buffering, clock distribution, and bus interfacing. It features two independent 4-bit sections with separate active-low output-enable (OE) controls, ±16-mA drive strength at 4.5–5.5 V, 7-ns typical propagation delay at 5 V, and operates from −40°C to 85°C.

For engineers reviewing the SN74LV240DWR datasheet, SN74LV240DWR pinout, SN74LV240DWR application, or SN74LV240DWR equivalent, this page delivers verified electrical specs, package mapping to SOIC-20 (DW), functional role in bus isolation, and validated alternative options for voltage-level-compatible 3-state logic replacement.

Technical Context

The SN74LV240DWR implements dual 4-bit inverting buffers with independent 3-state control per section - OE1 enables Y1–Y4 outputs from A1–A4, OE2 enables Y5–Y8 from A5–A8. Each output transitions between active low/high and high-impedance states without internal latching.

It uses TI's EPIC™ (Enhanced-Performance Implanted CMOS) 2-µm process, delivering low ground bounce (<0.8 V) and undershoot (>2 V), ESD protection exceeding 2000 V (MIL-STD-883C), and latch-up immunity >250 mA (JESD-17). Input thresholds scale with V_CC, supporting mixed-voltage system interfacing.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 5.5 V - supports direct interface with 3.3-V and 5-V logic families without level shifters.
Output Drive	±16 mA at V_CC = 4.5–5.5 V - sufficient to drive 50-pF loads across PCB traces or multiple TTL inputs.
t_pd (A→Y)	7 ns (min) / 13 ns (typ) at 5 V - enables reliable timing in 30-MHz+ address/data bus applications.
t_en/t_dis	11–28 ns enable/disable - ensures clean bus arbitration with minimal contention window during state transitions.
I_OFF (High-Z Leakage)	±5 µA max at V_CC = 5.5 V - prevents signal corruption on shared buses when outputs are disabled.
Input Thresholds	V_IH = 3.15 V (5-V mode), V_IL = 0.8 V (3.3-V mode) - compatible with both LVTTL and LVCMOS input standards.
Operating Temp	−40°C to +85°C - qualified for industrial-grade embedded systems and commercial control equipment.

Pinout & Package

SN74LV240DWR is packaged in a 20-pin SOIC (DW) body measuring 7.5 mm × 12.8 mm, with 1.27-mm pitch, RoHS-compliant lead finish, and moisture sensitivity level (MSL) rating per JEDEC standards.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	1OE, 2OE	Active-low output-enable inputs - independently disable Y1–Y4 (Pin 1) or Y5–Y8 (Pin 19).
2, 4, 6, 8	1A1–1A4	Inverting input group 1 - drives Y1–Y4 (Pins 18, 16, 14, 12) when 1OE is low.
3, 5, 7, 9	2Y4–2Y1	Inverting outputs group 2 - mirror inverted logic of 2A1–2A4 (Pins 11, 13, 15, 17) when 2OE is low.
11, 13, 15, 17	2A1–2A4	Inverting input group 2 - drives Y5–Y8 (Pins 3, 5, 7, 9) when 2OE is low.
12, 14, 16, 18	1Y1–1Y4	Inverting outputs group 1 - provide buffered, inverted signals from 1A1–1A4 under 1OE control.
10, 20	GND, V_CC	Power reference and supply - decoupling capacitor placement near Pin 10 (GND) and Pin 20 (V_CC) required for noise suppression.

Key Features

Feature	Design Value
EPIC™ CMOS Process	Delivers low ground bounce (<0.8 V) and robust noise immunity for stable operation in noisy industrial environments.
3-State Output Control	Independent OE pins per 4-bit section allow selective bus partitioning without external gating logic.
Voltage-Tolerant Inputs	Accepts 5-V-tolerant inputs at V_CC = 3.3 V - simplifies mixed-supply system design without external clamping.
Low Power Dissipation	20 µA max I_CC at V_CC = 5.5 V - reduces static power in always-on control subsystems.
Latch-Up Immunity	Exceeds 250 mA per JESD-17 - ensures reliability in hot-plug or transient-prone backplane applications.

Applications

Memory Address Buffering	Industrial Bus Isolation
Use Scenario: Driving 16-bit address lines from a microcontroller to SRAM or flash memory in programmable logic controllers. IC Role / Device Role / Timing Role: Inverting 3-state buffer that isolates address bus during DMA cycles and enables clean address latching. Use Value: Prevents bus contention during multi-master arbitration while maintaining <13-ns propagation delay for sub-30-MHz memory access timing.	Use Scenario: Interfacing a 3.3-V FPGA I/O bank to legacy 5-V peripheral modules in factory automation hardware. IC Role / Device Role / Timing Role: Voltage-level translating buffer with 3-state control to manage bidirectional data flow on shared control buses. Use Value: Eliminates need for discrete level shifters by accepting 5-V inputs at 3.3-V V_CC, reducing BOM count and board area.
Clock Distribution Network	Test Equipment Signal Conditioning
Use Scenario: Fan-out and buffering of a 25-MHz system clock to multiple ASIC clock inputs in medical imaging subsystems. IC Role / Device Role / Timing Role: Low-skew inverting driver providing matched delay paths and high-drive capability for clock tree loading. Use Value: Delivers ±16-mA drive into 50-pF loads with <13-ns t_pd variation, minimizing clock skew across 8 downstream receivers.	Use Scenario: Enabling/disabling analog multiplexer control lines in automated test equipment (ATE) during self-test sequences. IC Role / Device Role / Timing Role: 3-state logic gate used to isolate control signals during calibration, preventing unintended channel switching. Use Value: High-impedance leakage <±5 µA ensures no false triggering of muxes during disabled state, improving test repeatability.

Memory Address Buffering

Industrial Bus Isolation

Use Scenario: Driving 16-bit address lines from a microcontroller to SRAM or flash memory in programmable logic controllers.

IC Role / Device Role / Timing Role: Inverting 3-state buffer that isolates address bus during DMA cycles and enables clean address latching.

Use Value: Prevents bus contention during multi-master arbitration while maintaining <13-ns propagation delay for sub-30-MHz memory access timing.

Use Scenario: Interfacing a 3.3-V FPGA I/O bank to legacy 5-V peripheral modules in factory automation hardware.

IC Role / Device Role / Timing Role: Voltage-level translating buffer with 3-state control to manage bidirectional data flow on shared control buses.

Use Value: Eliminates need for discrete level shifters by accepting 5-V inputs at 3.3-V V_CC, reducing BOM count and board area.

Clock Distribution Network

Test Equipment Signal Conditioning

Use Scenario: Fan-out and buffering of a 25-MHz system clock to multiple ASIC clock inputs in medical imaging subsystems.

IC Role / Device Role / Timing Role: Low-skew inverting driver providing matched delay paths and high-drive capability for clock tree loading.

Use Value: Delivers ±16-mA drive into 50-pF loads with <13-ns t_pd variation, minimizing clock skew across 8 downstream receivers.

Use Scenario: Enabling/disabling analog multiplexer control lines in automated test equipment (ATE) during self-test sequences.

IC Role / Device Role / Timing Role: 3-state logic gate used to isolate control signals during calibration, preventing unintended channel switching.

Use Value: High-impedance leakage <±5 µA ensures no false triggering of muxes during disabled state, improving test repeatability.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC240APW	Lower V_CC range (1.65–3.6 V); 3.6-V absolute max; 24-mA drive at 3.3 V; TSSOP-20 package.	Better suited for pure 3.3-V or battery-powered systems; not 5-V tolerant on inputs.	Select when operating exclusively below 3.6 V and higher drive current is needed; verify input voltage compatibility.
74LVX240M	Same V_CC range (2.7–3.6 V); 12-mA drive; SOIC-20; lower ICC (10 µA); different propagation delay profile (10 ns typ).	Optimized for ultra-low-power portable instrumentation; lacks 5-V input tolerance.	Choose for extended battery life where 12-mA drive suffices and 5-V signal compatibility is unnecessary.

Compared with SN74LV240DWR, SN74LVC240APW offers higher drive but narrower voltage range, while 74LVX240M trades drive strength for lower quiescent current - both require revalidation of input voltage margins and thermal derating in existing 5-V-tolerant designs.

Availability

SN74LV240DWR is available at Aetrix Electronics and suitable for industrial control systems, test instrumentation, and legacy 5-V embedded platforms requiring stable component supply and long-term obsolescence management.

Supply support for SN74LV240DWR 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74LV240DWR belongs to TI's LV family of low-voltage logic devices, engineered for interoperability across 2.7–5.5-V systems and optimized for noise-immune bus driving in industrial and instrumentation applications.

FAQ

What is the function of the SN74LV240DWR in a digital system?

The SN74LV240DWR functions as an octal inverting 3-state buffer, enabling bidirectional bus control by selectively passing inverted logic signals from eight inputs to eight outputs under independent output-enable control. Its dual 4-bit sections allow segmented bus management, making it ideal for memory addressing, clock fan-out, and peripheral interfacing in industrial and embedded systems where signal integrity and voltage flexibility matter.

Does the SN74LV240DWR support 5-V input signals when powered at 3.3 V?

Yes, the SN74LV240DWR supports 5-V-tolerant inputs at V_CC = 3.3 V, as confirmed by its absolute maximum input voltage rating of V_CC + 0.5 V (up to 3.8 V) and documented 5-V-compatible operation in TI's SCLS193B datasheet. This allows safe interfacing between 3.3-V logic domains and legacy 5-V peripherals without external level-shifting circuitry.

What is the recommended decoupling strategy for the SN74LV240DWR?

TI recommends placing a 0.1-µF ceramic capacitor between Pin 20 (V_CC) and Pin 10 (GND), located within 3 mm of the SN74LV240DWR package. For systems with high-frequency switching or multiple drivers, add a bulk 4.7-µF tantalum capacitor nearby. This minimizes supply rail noise and suppresses ground bounce (<0.8 V typical), preserving signal integrity in dense PCB layouts.

Is the SN74LV240DWR pin-compatible with other members of the '240 family?

No - the SN74LV240DWR uses the DW (SOIC-20) package with a defined pinout matching TI's standard '240 logic layout, but it is not pin-compatible with non-LV variants like SN74LS240 or SN74HC240 due to differing input thresholds, drive strength, and absolute maximum ratings. Always verify pin mapping and electrical compatibility before substitution.

What is the maximum capacitive load the SN74LV240DWR can drive reliably?

The SN74LV240DWR is characterized for CL = 50 pF in switching tests, with 7–13 ns propagation delay at 5 V. While it can drive heavier loads, performance degrades linearly beyond 50 pF - for loads >75 pF, TI recommends verifying setup/hold timing margins and adding series termination resistors to damp ringing. Its ±16-mA output drive supports moderate trace capacitance in typical PCB routing.

SN74LV240DWR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

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:: -

SN74LV240DWR FAQ

1.How can I place an order for SN74LV240DWR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LV240DWR 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 SN74LV240DWR reliable?

The price and inventory of SN74LV240DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV240DWR is usually 5 days.

3.What payment methods are accepted for SN74LV240DWR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV240DWR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LV240DWR?

SN74LV240DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LV240DWR 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 SN74LV240DWR?

For technical support, including SN74LV240DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV240DWR requirements.

6.How does Aetrix verify that SN74LV240DWR is sourced from the original manufacturer or authorized distributors?

All SN74LV240DWR 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 SN74LV240DWR meets industry standards.

7.What is the process for return or replacement of SN74LV240DWR?

All SN74LV240DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV240DWR, 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 SN74LV240DWR part is unused and in its original packaging.

Return procedure for SN74LV240DWR:

1.Submit a request within 90 days.

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

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