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

Texas Instruments SN74LVTH540NSR

Name: SN74LVTH540NSR
Brand: Texas Instruments
SKU: SN74LVTH540NSR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVTH540NSR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.209", 5.30mm Width)

Datasheet:: SN74LVTH540NSR.pdf

Description:: IC BUFFER INVERT 3.6V 20SO

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Product details

Overview

SN74LVTH540NSR from Texas Instruments is an octal buffer/driver IC designed for 3.3-V V_CC operation with mixed-mode 5-V input/output compatibility, 8-channel noninverting logic, and dual active-low 3-state enable (OE1/OE2). It delivers 64 mA sink current per output at V_CC = 3 V, supports bus-hold on all data inputs, and operates from −40°C to 85°C in a 20-pin SSOP package.

For engineers reviewing the SN74LVTH540NSR datasheet, SN74LVTH540NSR pinout, SN74LVTH540NSR application, or SN74LVTH540NSR equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts for bus interface upgrades in industrial control and memory address buffering.

Technical Context

The SN74LVTH540NSR implements dual active-low 2-input AND logic for 3-state control: outputs enter high-impedance when either OE1 or OE2 is high. Its bus-hold circuitry maintains valid logic states on undriven A1–A8 inputs without external resistors, drawing ±75 µA at V_CC = 3 V.

It features I_off protection enabling hot insertion: outputs disable during power-down to prevent backflow, and power-up 3-state ensures high-Z during V_CC ramp from 0 to 1.5 V. Absolute maximum ratings include 7-V input tolerance and −0.5 V to V_CC + 0.5 V output voltage range in high state.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 3.6 V - supports unregulated battery operation down to 2.7 V without functional degradation
I_OL per Output	64 mA at V_CC = 3 V - drives heavy capacitive loads or multiple TTL inputs directly
t_PLH/t_PHL	3.8 ns typical at V_CC = 3.3 V, CL = 50 pF - enables reliable timing in 100+ MHz bus systems
Bus-Hold Current	±75 µA at V_CC = 3 V - eliminates need for external pullup/pulldown resistors on A1–A8
I_off	±100 µA at V_CC = 0 - prevents damaging current backflow during hot insertion
V_OH Min	2.4 V at I_OH = −24 mA - ensures robust TTL-level high output into standard 5-V logic loads
V_OL Max	0.55 V at I_OL = 64 mA - guarantees clean low-level signaling under full drive conditions

Pinout & Package

SN74LVTH540NSR uses a 20-pin Small Outline Package (SSOP), package code NS, with 0.65 mm lead pitch, 7.5 mm × 5.6 mm body size, and 2.0 mm max height per JEDEC MO-150.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8	A1–A8 Data Inputs	Noninverting input channels with integrated bus-hold; tolerate 5-V signals while operating at 3.3-V V_CC
9	GND	Ground reference for all internal circuitry and output drivers
10	V_CC	3.3-V supply input; supports operation down to 2.7 V with full specification compliance
11, 19	OE1, OE2	Active-low 3-state enable inputs; OR logic - either high forces all Y outputs into high-Z
12, 13, 14, 15, 16, 17, 18, 20	Y1–Y8 Outputs	Noninverting buffered outputs; each sinks 64 mA or sources 32 mA at V_CC = 3 V

Key Features

Feature	Design Value
Mixed-Mode Signal Operation	5-V-tolerant inputs/outputs with 3.3-V V_CC - enables seamless interfacing between legacy 5-V and modern 3.3-V subsystems
Bus-Hold Circuitry	Integrated on all A1–A8 inputs - eliminates external pullup/pulldown resistors and reduces BOM count and board space
Hot-Insertion Support	I_off and power-up 3-state - prevents damage during live board replacement in telecom and server backplanes
Output Ground Bounce	<0.8 V typical at V_CC = 3.3 V - minimizes noise coupling into adjacent signal lines during switching
Latch-Up Immunity	>500 mA per JESD 17 - ensures robustness against transient overcurrent events in industrial environments

Applications

Industrial PLC Backplane Interface	Memory Address Buffering
Use Scenario: Isolating and driving address lines between a 3.3-V microcontroller and 5-V SRAM modules in programmable logic controllers. IC Role / Device Role / Timing Role: Noninverting octal buffer with 5-V-tolerant inputs and 3.3-V-compatible outputs, providing level translation and drive strength enhancement. Use Value: Eliminates discrete level shifters and external pull resistors while maintaining timing integrity up to 100 MHz due to sub-4 ns propagation delay.	Use Scenario: Driving high-capacitance memory address buses in embedded instrumentation systems with mixed-voltage components. IC Role / Device Role / Timing Role: Bus-hold-enabled octal driver ensuring stable address line states during processor reset or bus contention. Use Value: Prevents floating inputs and spurious memory access errors without adding external components, reducing layout complexity and failure modes.
Telecom Line Card Hot-Swap Interface	Automotive Body Control Module I/O Expansion
Use Scenario: Enabling safe insertion/removal of line cards in carrier-grade telecom equipment powered by 3.3-V rails. IC Role / Device Role / Timing Role: Dual-enable 3-state buffer with I_off and power-up high-Z for zero-current backflow during card mating. Use Value: Meets GR-63-CORE reliability requirements by preventing latch-up and ground bounce during mechanical insertion events.	Use Scenario: Expanding GPIO capability from a 3.3-V MCU to control 5-V relay drivers and sensor interfaces in vehicle body electronics. IC Role / Device Role / Timing Role: Level-translating buffer with ESD protection exceeding 2000-V HBM and 200-V MM for harsh automotive environments. Use Value: Integrates bus-hold, hot-swap, and robust ESD protection into one device, reducing component count and qualification effort.

Industrial PLC Backplane Interface

Memory Address Buffering

Use Scenario: Isolating and driving address lines between a 3.3-V microcontroller and 5-V SRAM modules in programmable logic controllers.

IC Role / Device Role / Timing Role: Noninverting octal buffer with 5-V-tolerant inputs and 3.3-V-compatible outputs, providing level translation and drive strength enhancement.

Use Value: Eliminates discrete level shifters and external pull resistors while maintaining timing integrity up to 100 MHz due to sub-4 ns propagation delay.

Use Scenario: Driving high-capacitance memory address buses in embedded instrumentation systems with mixed-voltage components.

IC Role / Device Role / Timing Role: Bus-hold-enabled octal driver ensuring stable address line states during processor reset or bus contention.

Use Value: Prevents floating inputs and spurious memory access errors without adding external components, reducing layout complexity and failure modes.

Telecom Line Card Hot-Swap Interface

Automotive Body Control Module I/O Expansion

Use Scenario: Enabling safe insertion/removal of line cards in carrier-grade telecom equipment powered by 3.3-V rails.

IC Role / Device Role / Timing Role: Dual-enable 3-state buffer with I_off and power-up high-Z for zero-current backflow during card mating.

Use Value: Meets GR-63-CORE reliability requirements by preventing latch-up and ground bounce during mechanical insertion events.

Use Scenario: Expanding GPIO capability from a 3.3-V MCU to control 5-V relay drivers and sensor interfaces in vehicle body electronics.

IC Role / Device Role / Timing Role: Level-translating buffer with ESD protection exceeding 2000-V HBM and 200-V MM for harsh automotive environments.

Use Value: Integrates bus-hold, hot-swap, and robust ESD protection into one device, reducing component count and qualification effort.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC540APW	Lower drive strength (24 mA sink), no bus-hold, 1.65–3.6 V V_CC range	Suitable only for light-load, fully driven buses; requires external pull resistors if inputs float	Select when cost sensitivity outweighs bus-hold requirement and load current ≤24 mA
SN74ALVCH162244DGGR	16-bit, dual-supply (1.65–3.6 V), no 5-V tolerance, higher pin count (48-pin TSSOP)	Designed for point-to-point high-speed buses, not mixed-voltage backplane interfacing	Choose for wider data paths and tighter timing budgets where 5-V compatibility is unnecessary

Compared with SN74LVC540APW and SN74ALVCH162244DGGR, the SN74LVTH540NSR uniquely combines 5-V input tolerance, integrated bus-hold, and 64 mA drive in a compact 20-pin SSOP-making it irreplaceable for legacy-system integration where signal integrity, component count, and mixed-voltage robustness are jointly critical.

Availability

SN74LVTH540NSR is available at Aetrix Electronics and suitable for industrial PLC backplane interface, memory address buffering, and telecom line card hot-swap applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVTH540NSR 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, embedded processing, and connectivity solutions with deep expertise in industrial, automotive, and communications infrastructure markets.

The SN74LVTH540NSR belongs to TI's LVTH logic family, engineered specifically for mixed-voltage system interfacing-enabling reliable 3.3-V core logic to drive or receive signals from legacy 5-V buses without external level-shifting components.

FAQ

What is the operating temperature range for the SN74LVTH540NSR?

The SN74LVTH540NSR is rated for operation from −40°C to +85°C, as confirmed in the "Recommended Operating Conditions" table of the SCBS681G datasheet. This industrial-grade temperature range supports deployment in programmable logic controllers, telecom line cards, and automotive body control modules where ambient thermal stress is significant.

Does the SN74LVTH540NSR support 5-V input signals while powered at 3.3 V?

Yes, the SN74LVTH540NSR explicitly supports mixed-mode signal operation: its inputs accept 0–5.5 V signals while V_CC is at 3.3 V, and outputs drive to TTL-compatible levels (≥2.4 V high, ≤0.55 V low) into 5-V loads. This capability is documented in the "Description" and "Recommended Operating Conditions" sections of the datasheet.

How does the bus-hold feature work on the SN74LVTH540NSR?

The SN74LVTH540NSR integrates active bus-hold circuitry on all eight data inputs (A1–A8), maintaining undriven inputs at their last-valid logic state with ±75 µA holding current at V_CC = 3 V. Per the datasheet, using external pullup/pulldown resistors with this feature is not recommended, as they conflict with internal biasing.

What is the maximum output sink current per channel for the SN74LVTH540NSR?

The SN74LVTH540NSR delivers up to 64 mA sink current per output (Y1–Y8) at V_CC = 3 V, as specified in the "Recommended Operating Conditions" table under I_OL. This rating enables direct driving of multiple TTL inputs or moderate-capacitance PCB traces without external amplification.

Is the SN74LVTH540NSR pin-compatible with other packages in the LVTH540 family?

No-the SN74LVTH540NSR uses a 20-pin SSOP (NS) package with 0.65 mm pitch, while SN74LVTH540DW uses SOIC (DW, 1.27 mm pitch) and SN74LVTH540PW uses TSSOP (PW, 0.65 mm pitch but different footprint dimensions). Pin numbering and physical layout differ across packages; PCB layout must be matched to the NS package outline per TI's DB0020A drawing.

SN74LVTH540NSR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVTH

Package/Case:: 20-SOIC (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Buffer, Inverting

Number of Elements:: 1

Number of Bits per Element:: 8

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-SO

SN74LVTH540NSR FAQ

1.How can I place an order for SN74LVTH540NSR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVTH540NSR 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 SN74LVTH540NSR reliable?

The price and inventory of SN74LVTH540NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH540NSR is usually 5 days.

3.What payment methods are accepted for SN74LVTH540NSR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH540NSR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LVTH540NSR?

SN74LVTH540NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVTH540NSR 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 SN74LVTH540NSR?

For technical support, including SN74LVTH540NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH540NSR requirements.

6.How does Aetrix verify that SN74LVTH540NSR is sourced from the original manufacturer or authorized distributors?

All SN74LVTH540NSR 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 SN74LVTH540NSR meets industry standards.

7.What is the process for return or replacement of SN74LVTH540NSR?

All SN74LVTH540NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH540NSR, 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 SN74LVTH540NSR part is unused and in its original packaging.

Return procedure for SN74LVTH540NSR:

1.Submit a request within 90 days.

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

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