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

Texas Instruments SN74LVT240APW

Name: SN74LVT240APW
Brand: Texas Instruments
SKU: SN74LVT240APW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVT240APW

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: SN74LVT240APW.pdf

Description:: IC BUFFER INVERT 3.6V 20TSSOP

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Product details

Overview

SN74LVT240APW from Texas Instruments is an octal buffer/line driver IC with dual 4-bit noninverting outputs, designed for 3.3-V V_CC operation while supporting 5-V TTL-level inputs and outputs. It features I_off and power-up 3-state for hot insertion, operates down to 2.7 V, and delivers t_PLH/t_PHL ≤ 4.6 ns at V_CC = 3.3 V - used in mixed-voltage bus interface and backplane driver applications.

For engineers reviewing the SN74LVT240APW datasheet, SN74LVT240APW pinout, SN74LVT240APW application, or SN74LVT240APW equivalent, key selection criteria include its 20-pin TSSOP package, ±100 µA I_off specification, 64 mA I_OL, support for unregulated battery operation, and compatibility with 5-V signal domains in 3.3-V systems.

Technical Context

The SN74LVT240APW implements two independent 4-bit noninverting buffer sections, each with dedicated output-enable (OE) control. Its logic diagram confirms active-low OE inputs driving high-impedance outputs when asserted high, and true-pass behavior (Y = A) when OE is low.

It integrates I_off circuitry that disables outputs during power-down to prevent current backflow, and power-up 3-state logic that forces outputs into high-Z when V_CC is below 1.5 V - both critical for hot-plug compliance. Absolute maximum ratings specify −0.5 V to 4.6 V V_CC, and input/output voltage tolerance up to 7 V.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 3.6 V - supports unregulated Li-ion battery supply without external regulation.
I_OL / I_OH	64 mA / −32 mA - drives standard TTL loads directly; enables fanout of ≥10 LVTTL devices.
t_PLH/t_PHL	≤ 4.6 ns at V_CC = 3.3 V, CL = 50 pF - meets timing requirements for 100-MHz bus interfaces.
I_off	±100 µA at V_CC = 0 - blocks damaging back-current during live insertion into powered backplanes.
V_IL/V_IH	0.8 V / 2.0 V - compatible with 5-V TTL input thresholds while operating on 3.3-V rail.
V_O Range (Hi-Z)	−0.5 V to 7 V - withstands overvoltage transients on disconnected buses without latch-up.
θ_JA	83°C/W (TSSOP-PW) - thermal performance validated for continuous 64-mA per-output operation at 85°C ambient.

Pinout & Package

TSSOP-20 (PW) package: 4.4 mm × 6.5 mm body, 0.65 mm lead pitch, 1.2 mm max height, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	1OE, 2OE	Active-low output-enable controls for first and second 4-bit buffer sections.
2–5, 13–16	1A1–1A4, 2A1–2A4	Data inputs; accept 5-V TTL logic levels with 3.3-V V_CC.
6–9, 11–14	1Y1–1Y4, 2Y1–2Y4	Noninverting buffered outputs; drive 5-V loads with 3.3-V supply.
10	GND	Ground reference for all logic and output stages; must be low-impedance.
20	V_CC	3.3-V supply input; decoupling capacitor required within 1 cm of pin.

Key Features

Feature	Design Value
Mixed-mode signal operation	Accepts 5-V inputs and drives 5-V loads while powered from 3.3-V rail - eliminates level-shifters in mixed-voltage systems.
Hot-insertion support	I_off + power-up 3-state ensures zero current backflow and no bus contention during live card insertion.
Low ground bounce	V_OLP < 0.8 V at V_CC = 3.3 V - maintains signal integrity under heavy capacitive switching loads.
Latch-up immunity	Exceeds 100 mA per JESD 78 Class II - prevents destructive latch-up during ESD or overvoltage events.
ESD robustness	2000-V HBM, 200-V MM, 1000-V CDM - survives handling and board assembly without special precautions.

Applications

Industrial Backplane Interface	Memory Module Address Buffer
Use Scenario: Interfacing 3.3-V FPGA control logic to legacy 5-V parallel address/data buses in programmable logic controllers. IC Role / Device Role / Timing Role: Noninverting octal buffer providing level translation and drive strength amplification between voltage domains. Use Value: Eliminates discrete level shifters; t_PHL ≤ 4.2 ns ensures setup/hold timing margin for 25-MHz bus cycles.	Use Scenario: Driving address lines from a 3.3-V microcontroller to DDR SDRAM modules requiring 5-V tolerant inputs. IC Role / Device Role / Timing Role: Dual 4-bit line driver enabling simultaneous buffering of A0–A3 and A4–A7 with independent OE control. Use Value: I_OL = 64 mA sustains signal integrity across 10-cm PCB traces loaded with 50 pF per stub.
Hot-Swappable I/O Card	Test Equipment Signal Conditioning
Use Scenario: Enabling safe insertion/removal of peripheral cards in modular test instrumentation with live backplane power. IC Role / Device Role / Timing Role: Bus isolation device using I_off and power-up 3-state to disconnect drivers before power sequencing. Use Value: ±100 µA I_off prevents >1 mA backfeed current during partial power-up - meets IEC 61000-4-2 system-level ESD immunity.	Use Scenario: Conditioning digital stimulus signals from 3.3-V pattern generators before injection into 5-V DUTs. IC Role / Device Role / Timing Role: Output amplifier and noise filter for precise edge-controlled waveforms in ATE systems. Use Value: VOL ≤ 0.55 V at I_OL = 64 mA guarantees <0.5 V noise margin at 5-V logic threshold, reducing false triggering.

Industrial Backplane Interface

Memory Module Address Buffer

Use Scenario: Interfacing 3.3-V FPGA control logic to legacy 5-V parallel address/data buses in programmable logic controllers.

IC Role / Device Role / Timing Role: Noninverting octal buffer providing level translation and drive strength amplification between voltage domains.

Use Value: Eliminates discrete level shifters; t_PHL ≤ 4.2 ns ensures setup/hold timing margin for 25-MHz bus cycles.

Use Scenario: Driving address lines from a 3.3-V microcontroller to DDR SDRAM modules requiring 5-V tolerant inputs.

IC Role / Device Role / Timing Role: Dual 4-bit line driver enabling simultaneous buffering of A0–A3 and A4–A7 with independent OE control.

Use Value: I_OL = 64 mA sustains signal integrity across 10-cm PCB traces loaded with 50 pF per stub.

Hot-Swappable I/O Card

Test Equipment Signal Conditioning

Use Scenario: Enabling safe insertion/removal of peripheral cards in modular test instrumentation with live backplane power.

IC Role / Device Role / Timing Role: Bus isolation device using I_off and power-up 3-state to disconnect drivers before power sequencing.

Use Value: ±100 µA I_off prevents >1 mA backfeed current during partial power-up - meets IEC 61000-4-2 system-level ESD immunity.

Use Scenario: Conditioning digital stimulus signals from 3.3-V pattern generators before injection into 5-V DUTs.

IC Role / Device Role / Timing Role: Output amplifier and noise filter for precise edge-controlled waveforms in ATE systems.

Use Value: VOL ≤ 0.55 V at I_OL = 64 mA guarantees <0.5 V noise margin at 5-V logic threshold, reducing false triggering.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC240APW	Lower drive (24 mA I_OL), narrower V_CC range (1.65–3.6 V), no 5-V tolerant inputs.	Suitable only for pure 3.3-V systems; cannot interface to 5-V buses.	Select when cost reduction is prioritized over mixed-voltage capability and higher drive strength.
74ALVC240PW	Higher speed (t_PD ≈ 3.3 ns), same 5-V tolerant inputs, but I_off not specified for hot insertion.	Lacks documented I_off and power-up 3-state - requires external protection for hot-swap use.	Choose for speed-critical 5-V tolerant buffering where hot insertion is not required.

Compared with SN74LVC240APW and 74ALVC240PW, the SN74LVT240APW uniquely combines 5-V input tolerance, 64 mA drive, and certified hot-insertion support - making it the only option among the three qualified for live-backplane industrial I/O cards.

Availability

SN74LVT240APW is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory module address buffering, hot-swappable I/O cards, and test equipment signal conditioning requiring stable component supply across extended temperature ranges (−40°C to 85°C).

Supply support for SN74LVT240APW 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 specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74LVT240APW belongs to TI's LVT (Low-Voltage BiCMOS Technology) logic family, engineered specifically for mixed-voltage system interfacing where 3.3-V logic must reliably communicate with legacy 5-V infrastructure.

FAQ

What is the maximum operating voltage for SN74LVT240APW?

The SN74LVT240APW has an absolute maximum V_CC rating of 4.6 V, but its recommended operating range is strictly 2.7 V to 3.6 V. Exceeding 3.6 V may cause parametric degradation or reliability risk, even if within absolute maximum limits. The SN74LVT240APW is not rated for sustained 5-V V_CC operation.

Does SN74LVT240APW support 5-V input signals while powered at 3.3 V?

Yes, the SN74LVT240APW explicitly supports 5-V TTL-level inputs with V_CC = 3.3 V. Its VIH is specified at 2.0 V minimum and absolute maximum input voltage is 7 V - allowing direct connection to 5-V logic without external level-shifting circuitry. This capability is confirmed in the "Mixed-Mode Signal Operation" feature statement.

How does SN74LVT240APW enable hot insertion?

The SN74LVT240APW enables hot insertion via two integrated circuits: I_off disables outputs when V_CC = 0, preventing back-current flow; and power-up 3-state forces outputs into high-impedance during V_CC ramp-up (0–1.5 V). Both functions are tested per JESD 78 and documented in the datasheet's "Ioff and Power-Up 3-State Support Hot Insertion" section.

What is the thermal resistance (θ_JA) of SN74LVT240APW in its TSSOP package?

The SN74LVT240APW in the PW (TSSOP-20) package has a published θ_JA of 83°C/W, measured per JESD 51-7 on a standard 4-layer JEDEC test board. This value assumes 1-inch² 2-oz copper pad beneath the package and is used to calculate junction temperature rise under load - critical for validating 64-mA per-output operation at 85°C ambient.

Can SN74LVT240APW drive standard TTL loads directly?

Yes, the SN74LVT240APW can drive standard TTL loads directly: its I_OL = 64 mA exceeds the 16-mA sink requirement of a single TTL unit load, and its VOH ≥ 2.4 V at I_OH = −8 mA satisfies TTL high-level output voltage specifications. This allows fanout of up to 10 standard TTL inputs per SN74LVT240APW output.

SN74LVT240APW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVT

Package/Case:: 20-TSSOP (0.173", 4.40mm Width)

Packaging:: Bulk

Product Status:: Active

Logic Type:: Buffer, 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-TSSOP

SN74LVT240APW FAQ

1.How can I place an order for SN74LVT240APW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVT240APW 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 SN74LVT240APW reliable?

The price and inventory of SN74LVT240APW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT240APW is usually 5 days.

3.What payment methods are accepted for SN74LVT240APW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVT240APW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LVT240APW?

SN74LVT240APW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVT240APW 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 SN74LVT240APW?

For technical support, including SN74LVT240APW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT240APW requirements.

6.How does Aetrix verify that SN74LVT240APW is sourced from the original manufacturer or authorized distributors?

All SN74LVT240APW 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 SN74LVT240APW meets industry standards.

7.What is the process for return or replacement of SN74LVT240APW?

All SN74LVT240APW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT240APW, 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 SN74LVT240APW part is unused and in its original packaging.

Return procedure for SN74LVT240APW:

1.Submit a request within 90 days.

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

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