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

Texas Instruments SN74LV240DW

Name: SN74LV240DW
Brand: Texas Instruments
SKU: SN74LV240DW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LV240DW

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: SN74LV240DW.pdf

Description:: BUS DRIVER

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Product details

Overview

SN74LV240DW from Texas Instruments is an octal 3-state noninverting buffer/driver IC designed for 2.7-V to 5.5-V V_CC operation, featuring two independent 4-bit sections with separate output-enable (OE) inputs, ±16-mA drive strength at 4.5–5.5 V, and propagation delay as low as 7 ns at 5 V - used in memory address buffering, clock distribution, and bus interface circuits.

For engineers reviewing the SN74LV240DW datasheet, SN74LV240DW pinout, SN74LV240DW application, or SN74LV240DW equivalent, this page delivers verified electrical specs, package mapping to SOIC-20 (DW), functional behavior under 3-state control, and real-world design context for industrial and embedded bus systems.

Technical Context

The SN74LV240DW implements dual 4-bit noninverting buffers with independent active-low OE controls per section, enabling selective 3-state output disabling without affecting the other channel. Each buffer passes A-inputs to Y-outputs when its OE is low; outputs enter high-impedance state when OE is high.

It uses TI's EPIC™ (Enhanced-Performance Implanted CMOS) 2-µm process, delivering low ground bounce (V_OLP < 0.8 V) and overshoot control (V_OHV > 2 V), along with latch-up immunity exceeding 250 mA per JEDEC JESD-17 and ESD protection >2000 V (MIL-STD-883C).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 5.5 V - supports mixed-voltage system interfacing across 3.3-V and 5-V logic domains.
I_OL/I_OH	±16 mA at V_CC = 4.5–5.5 V - drives standard TTL loads and multiple CMOS inputs without external buffering.
t_pd (A→Y)	7 ns (min) at V_CC = 5 V - enables reliable timing in high-speed address/data bus applications up to ~70 MHz.
t_en/t_dis	11–28 ns enable/disable times - ensures clean bus arbitration with minimal contention window during state transitions.
Input Thresholds	V_IH = 3.15 V (for 4.5–5.5 V), V_IL = 0.8 V (for 2.7–3.6 V) - compatible with both LVTTL and LVCMOS input logic families.
Power Dissipation	1.6 W max (DW package, still air, T_A = 55°C) - defines thermal derating limits for PCB layout and airflow planning.
C_pd (per buffer)	78 pF at 5 V - quantifies dynamic power consumption during switching; critical for low-power system budgeting.

Pinout & Package

SN74LV240DW is housed in a 20-pin plastic small-outline integrated circuit (SOIC) package (DW), 7.5 mm × 12.8 mm body, 1.27 mm pitch, gull-wing leads, RoHS-compliant (Pb-Free).

Pin/Terminal	Circuit Role	Design Meaning
1, 19	1OE, 2OE	Active-low output-enable controls for Section 1 (pins 1A1–1A4 → 1Y1–1Y4) and Section 2 (2A1–2A4 → 2Y1–2Y4).
2–5, 18–15	1A1–1A4, 1Y1–1Y4	Section 1 noninverting input/output pairs - direct path with no polarity inversion; used for unidirectional data forwarding.
11–14, 7–10	2A1–2A4, 2Y1–2Y4	Section 2 noninverting input/output pairs - electrically isolated from Section 1; allows independent bus segment control.
10, 20	GND, V_CC	Power reference and supply pins - require local 0.1-µF ceramic decoupling adjacent to pin 20 for noise suppression.

Key Features

Feature	Design Value
EPIC™ 2-µm CMOS Process	Enables low-noise switching with controlled ground bounce (<0.8 V) and overshoot (>2 V), critical for signal integrity in dense PCB layouts.
Dual Independent 4-bit Sections	Allows simultaneous but isolated control of two 4-bit buses - e.g., upper/lower memory address lanes or separate peripheral data paths.
3-State Output Control	High-impedance outputs eliminate bus contention during multi-driver arbitration; OE inputs support synchronous or asynchronous disable.
Wide Supply Range (2.7–5.5 V)	Permits direct interface between 3.3-V microcontrollers and 5-V legacy peripherals without level-shifting circuitry.
Latch-Up Immunity & ESD Robustness	Exceeds 250 mA latch-up current (JESD-17) and 2000 V HBM ESD - enhances reliability in industrial environments with transient exposure.

Applications

Memory Address Buffering	System Clock Distribution
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM/ROM chips on a shared bus. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control isolates address drivers during memory access arbitration. Use Value: ±16-mA drive strength ensures full-rail logic levels across 10-cm traces; 7-ns t_pd maintains setup/hold timing margins at 25-MHz bus clocks.	Use Scenario: Distributing a master system clock to multiple peripheral controllers while minimizing skew and loading. IC Role / Device Role / Timing Role: Low-skew, fan-out buffer with matched propagation delays across all eight outputs. Use Value: Dual-section architecture allows separate enable control per clock domain; low C_pd (78 pF) reduces jitter contribution from switching noise.
Industrial I/O Expansion	Legacy Bus Interface
Use Scenario: Interfacing a 3.3-V FPGA I/O bank to 5-V industrial sensors and actuators via parallel control lines. IC Role / Device Role / Timing Role: Level-tolerant voltage translator and current amplifier for bidirectional digital control signals. Use Value: 2.7–5.5-V V_CC range accepts 3.3-V logic inputs while sourcing/sinking 16 mA into 5-V loads - eliminates discrete level shifters.	Use Scenario: Connecting modern low-voltage microcontrollers to legacy ISA or PC/104 bus peripherals requiring 5-V signaling. IC Role / Device Role / Timing Role: Bidirectional bus transceiver replacement in unidirectional mode, with OE-controlled directionality. Use Value: SOIC-20 DW package fits legacy footprint; 250-mA latch-up rating withstands industrial bus fault conditions without failure.

Memory Address Buffering

System Clock Distribution

Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM/ROM chips on a shared bus.

IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control isolates address drivers during memory access arbitration.

Use Value: ±16-mA drive strength ensures full-rail logic levels across 10-cm traces; 7-ns t_pd maintains setup/hold timing margins at 25-MHz bus clocks.

Use Scenario: Distributing a master system clock to multiple peripheral controllers while minimizing skew and loading.

IC Role / Device Role / Timing Role: Low-skew, fan-out buffer with matched propagation delays across all eight outputs.

Use Value: Dual-section architecture allows separate enable control per clock domain; low C_pd (78 pF) reduces jitter contribution from switching noise.

Industrial I/O Expansion

Legacy Bus Interface

Use Scenario: Interfacing a 3.3-V FPGA I/O bank to 5-V industrial sensors and actuators via parallel control lines.

IC Role / Device Role / Timing Role: Level-tolerant voltage translator and current amplifier for bidirectional digital control signals.

Use Value: 2.7–5.5-V V_CC range accepts 3.3-V logic inputs while sourcing/sinking 16 mA into 5-V loads - eliminates discrete level shifters.

Use Scenario: Connecting modern low-voltage microcontrollers to legacy ISA or PC/104 bus peripherals requiring 5-V signaling.

IC Role / Device Role / Timing Role: Bidirectional bus transceiver replacement in unidirectional mode, with OE-controlled directionality.

Use Value: SOIC-20 DW package fits legacy footprint; 250-mA latch-up rating withstands industrial bus fault conditions without failure.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC240APW	TSSOP-20 (PW), 1.65–3.6-V V_CC, lower drive (±24 mA), faster t_pd (5.3 ns @ 3.3 V).	Optimized for 3.3-V-only systems; not suitable for 5-V bus interfacing.	Select when operating exclusively at 3.3 V and board space is constrained; requires redesign for 5-V compatibility.
74AC240N	PDIP-20, 2–6-V V_CC, higher drive (±24 mA), slower t_pd (8.5 ns @ 5 V), no EPIC noise control.	Legacy through-hole assembly; lacks ground-bounce mitigation features needed in high-density layouts.	Choose only for through-hole prototyping or repair of older designs; not recommended for new SMT-based industrial systems.

Compared with SN74LV240DW, SN74LVC240APW offers better speed and density but sacrifices 5-V interoperability, while 74AC240N provides broader voltage tolerance and through-hole compatibility at the cost of noise performance and modern packaging.

Availability

SN74LV240DW is available at Aetrix Electronics and suitable for memory subsystems, clock tree distribution, industrial I/O expansion, and legacy bus interface designs requiring stable component supply and long-term obsolescence management.

Supply support for SN74LV240DW 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 SN74LV240DW belongs to TI's LV family of low-voltage logic devices, engineered for robust 2.7–5.5-V operation with enhanced noise immunity and bus-driving capability in industrial control and embedded computing systems.

FAQ

What is the maximum operating temperature range for the SN74LV240DW?

The SN74LV240DW is characterized for operation from −40°C to +85°C ambient temperature. This industrial-grade range supports deployment in factory automation, motor control, and outdoor embedded systems where thermal cycling and extended ambient extremes are common. The SN74LV240DW does not support the extended military range (−55°C to +125°C) offered by the SN54LV240 variant.

Does the SN74LV240DW support 5-V logic inputs when powered at 3.3 V?

Yes - the SN74LV240DW features overvoltage-tolerant inputs. When V_CC = 3.3 V, it accepts input voltages up to V_CC + 0.5 V (i.e., up to 3.8 V), but not full 5-V TTL levels. For true 5-V input compatibility, V_CC must be set to ≥4.5 V per the recommended operating conditions. The SN74LV240DW is not 5-V tolerant at 3.3-V supply unless explicitly biased per TI's application guidance.

How many independent 3-state control inputs does the SN74LV240DW have?

The SN74LV240DW has two independent active-low output-enable inputs: 1OE (pin 1) controls the first 4-bit section (1A1–1A4 → 1Y1–1Y4), and 2OE (pin 19) controls the second 4-bit section (2A1–2A4 → 2Y1–2Y4). This allows granular bus segmentation - for example, enabling only upper address bits while holding lower bits in high-Z during partial memory access.

Is the SN74LV240DW pin-compatible with the SN74LS240?

No - the SN74LV240DW is not pin-compatible with the bipolar SN74LS240. Although both are octal 3-state noninverting buffers in 20-pin packages, the pin assignments differ: SN74LS240 uses pin 1 for GND and pin 20 for V_CC, whereas SN74LV240DW places GND at pin 10 and V_CC at pin 20. Direct replacement would require PCB layout revision and signal re-routing.

What is the typical power dissipation of the SN74LV240DW at 5 V with all outputs driving 16 mA?

At V_CC = 5 V with all eight outputs actively sourcing or sinking 16 mA, the SN74LV240DW dissipates approximately 120 mW under static load (calculated as V_CC × I_CC + Σ|V_CC × I_O|). Dynamic dissipation depends on toggle rate and load capacitance; per datasheet, C_pd = 78 pF per buffer yields ~1.95 mW/MHz per enabled output at 5 V. Total power must stay below the DW package limit of 1.6 W.

SN74LV240DW 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:: -

SN74LV240DW FAQ

1.How can I place an order for SN74LV240DW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LV240DW 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 SN74LV240DW reliable?

The price and inventory of SN74LV240DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV240DW is usually 5 days.

3.What payment methods are accepted for SN74LV240DW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV240DW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LV240DW?

SN74LV240DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LV240DW 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 SN74LV240DW?

For technical support, including SN74LV240DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV240DW requirements.

6.How does Aetrix verify that SN74LV240DW is sourced from the original manufacturer or authorized distributors?

All SN74LV240DW 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 SN74LV240DW meets industry standards.

7.What is the process for return or replacement of SN74LV240DW?

All SN74LV240DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV240DW, 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 SN74LV240DW part is unused and in its original packaging.

Return procedure for SN74LV240DW:

1.Submit a request within 90 days.

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

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