Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Texas Instruments SN74LVC540AQPWREP

Name: SN74LVC540AQPWREP
Brand: Texas Instruments
SKU: SN74LVC540AQPWREP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SN74LVC540AQPWREP

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: SN74LVC540AQPWREP.pdf

Description:: IC BUFFER INVERT 3.6V 20TSSOP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,700

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SN74LVC540AQPWREP from Texas Instruments is an octal buffer/driver with 3-state outputs, designed for 2.0 V to 3.6 V operation, supporting mixed-mode signal interfacing (5-V-tolerant inputs), with max propagation delay of 5.3 ns at 3.3 V and I_off support for partial-power-down mode - ideal for buffering memory address lines or driving high-capacitance bus loads in industrial control systems.

For engineers reviewing the SN74LVC540AQPWREP datasheet, SN74LVC540AQPWREP pinout, SN74LVC540AQPWREP application, or SN74LVC540AQPWREP equivalent, key selection considerations include 3-state enable logic (dual active-low OE), 5.5-V input tolerance, ±24-mA output drive, thermal performance (θ_JA = 83°C/W), and TSSOP-20 packaging for space-constrained PCB layouts.

Technical Context

This device implements dual independent 3-state enable control via two active-low AND-gated inputs (OE1 and OE2), ensuring all eight outputs enter high-impedance state if either enable is high. Its LVC logic family enables interoperability between 3.3-V core logic and legacy 5-V peripherals without level-shifting circuitry.

The SN74LVC540AQPWREP features I_off protection that disables outputs during power-down, preventing backflow current when V_CC = 0 V, and maintains input/output voltage tolerance up to 5.5 V across the full –40°C to 125°C operating range - critical for ruggedized embedded systems requiring extended temperature reliability.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.0 V to 3.6 V - supports low-voltage system rails while maintaining compatibility with 3.3-V I/O standards.
Input Voltage Tolerance	Up to 5.5 V - allows direct connection to 5-V logic without external level shifters in mixed-voltage systems.
t_pd (Max)	5.3 ns at V_CC = 3.3 V - enables reliable timing in high-speed address/data buffering up to ~100 MHz clock domains.
I_OL/I_OH	±24 mA at V_CC = 3.0 V - drives ≥10 LVC loads or moderate PCB trace capacitance without signal degradation.
I_off Support	Enabled - prevents destructive current flow during partial power-down, satisfying IPC-TR-579 and MIL-STD-883 Class B requirements.
Operating Temperature	–40°C to 125°C - qualified per JEDEC JESD22-A108 for extended-life operation in automotive under-hood and industrial motor-control environments.

Pinout & Package

TSSOP-20 package (PW), 0.65-mm pitch, 6.5-mm × 4.4-mm body, 1.2-mm max height, moisture sensitivity level 1 (260°C peak reflow), RoHS-compliant NiPdAu lead finish.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	OE1, OE2	Active-low 3-state enable inputs - dual AND-gated control ensures outputs go high-Z if either is high; requires pull-up to V_CC for power-up safety.
2–9	A1–A8	Noninverting data inputs - accept 0–5.5 V signals; compatible with TTL, CMOS, and LVTTL logic families.
11–18	Y1–Y8	Noninverting buffered outputs - drive bus lines or address registers with rail-to-rail swing and ±24-mA sink/source capability.
10	GND	Digital ground reference - must be low-inductance connection to minimize ground bounce (V_OLP < 0.8 V typical).
20	V_CC	Supply voltage input - decoupling capacitor (0.1 µF ceramic) required within 5 mm for stable switching noise suppression.

Key Features

Feature	Design Value
Mixed-mode voltage translation	5-V-tolerant inputs operate reliably with 3.3-V V_CC, eliminating discrete level shifters in 3.3/5-V interface bridges.
Dual 3-state enable logic	Independent OE1/OE2 pins allow selective bank disablement or synchronized global disable - simplifies bus arbitration in multi-master systems.
I_off protection	Automatically disables outputs when V_CC = 0 V, meeting IEC 61000-4-2 ESD immunity requirements for hot-plug and partial-power-down scenarios.
Low ground bounce	Typical V_OLP < 0.8 V at V_CC = 3.3 V ensures clean logic-low transitions even under heavy capacitive loading.
Extended temperature qualification	JEDEC JESD22-A108 HAST, temperature cycling, and bond intermetallic life testing confirm reliability over full –40°C to 125°C range.

Applications

Industrial PLC Backplane Interface	Automotive Body Control Module
Use Scenario: Buffering microcontroller GPIOs to drive 24-V relay driver ICs and sensor input muxes on a modular I/O carrier board. IC Role / Device Role / Timing Role: Octal noninverting buffer with 3-state control isolates MCU pins from noisy backplane transients and enables dynamic bus sharing among multiple modules. Use Value: 5.5-V input tolerance accepts feedback signals from 24-V level-shifted sensors; I_off prevents backfeed during module hot-swap; t_pd ≤5.3 ns supports 20-MHz scan-cycle timing.	Use Scenario: Translating CAN controller address/data lines to legacy 5-V EEPROM and flash memory in a zone controller with mixed-voltage subsystems. IC Role / Device Role / Timing Role: Level-translating buffer isolates 3.3-V CAN MCU from 5-V memory peripherals while maintaining signal integrity across 15-cm PCB traces. Use Value: Eliminates need for discrete MOSFET translators; ±24-mA drive sustains signal edge rates over 30-pF net capacitance; –40°C to 125°C rating matches under-dash thermal envelope.
Avionics Data Acquisition Unit	Ruggedized Medical Imaging Controller
Use Scenario: Driving ADC channel-selection lines and FPGA configuration buses in a DO-254-certified DAQ card exposed to wide ambient swings. IC Role / Device Role / Timing Role: High-reliability octal buffer provides deterministic 3-state isolation between FPGA and analog front-end during reconfiguration sequences. Use Value: MSL-1 reflow compatibility enables single-pass assembly; JEDEC-qualified thermal cycling performance ensures >10,000-hour MTBF; low V_OLP prevents false triggering of precision analog comparators.	Use Scenario: Isolating ARM-based SoC address bus from radiation-hardened SRAM and FPGA-based image processing pipeline in portable ultrasound equipment. IC Role / Device Role / Timing Role: Bus driver with controlled enable sequencing manages memory access arbitration between CPU and real-time imaging engine. Use Value: Dual OE inputs allow staggered enable timing to suppress simultaneous switching noise; 2.0–3.6-V V_CC range aligns with SoC core voltage scaling; TSSOP-20 footprint minimizes board area in handheld form factor.

Industrial PLC Backplane Interface

Automotive Body Control Module

Use Scenario: Buffering microcontroller GPIOs to drive 24-V relay driver ICs and sensor input muxes on a modular I/O carrier board.

IC Role / Device Role / Timing Role: Octal noninverting buffer with 3-state control isolates MCU pins from noisy backplane transients and enables dynamic bus sharing among multiple modules.

Use Value: 5.5-V input tolerance accepts feedback signals from 24-V level-shifted sensors; I_off prevents backfeed during module hot-swap; t_pd ≤5.3 ns supports 20-MHz scan-cycle timing.

Use Scenario: Translating CAN controller address/data lines to legacy 5-V EEPROM and flash memory in a zone controller with mixed-voltage subsystems.

IC Role / Device Role / Timing Role: Level-translating buffer isolates 3.3-V CAN MCU from 5-V memory peripherals while maintaining signal integrity across 15-cm PCB traces.

Use Value: Eliminates need for discrete MOSFET translators; ±24-mA drive sustains signal edge rates over 30-pF net capacitance; –40°C to 125°C rating matches under-dash thermal envelope.

Avionics Data Acquisition Unit

Ruggedized Medical Imaging Controller

Use Scenario: Driving ADC channel-selection lines and FPGA configuration buses in a DO-254-certified DAQ card exposed to wide ambient swings.

IC Role / Device Role / Timing Role: High-reliability octal buffer provides deterministic 3-state isolation between FPGA and analog front-end during reconfiguration sequences.

Use Value: MSL-1 reflow compatibility enables single-pass assembly; JEDEC-qualified thermal cycling performance ensures >10,000-hour MTBF; low V_OLP prevents false triggering of precision analog comparators.

Use Scenario: Isolating ARM-based SoC address bus from radiation-hardened SRAM and FPGA-based image processing pipeline in portable ultrasound equipment.

IC Role / Device Role / Timing Role: Bus driver with controlled enable sequencing manages memory access arbitration between CPU and real-time imaging engine.

Use Value: Dual OE inputs allow staggered enable timing to suppress simultaneous switching noise; 2.0–3.6-V V_CC range aligns with SoC core voltage scaling; TSSOP-20 footprint minimizes board area in handheld form factor.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC244AQPWREP	Octal buffer with separate A/B-side enables (no dual-OE AND logic); identical V_CC, speed, and drive specs.	Lacks synchronized dual-enable behavior; better suited for asymmetric bus partitioning than global disable.	Select when independent control of two 4-bit groups is preferred over unified 8-bit gating.
74LVC541APWRE4	Inverting octal buffer (Y = NOT A); same V_CC range, 5.3-ns t_pd, and 5.5-V input tolerance.	Requires logic inversion in upstream signal path; unsuitable where polarity preservation is mandatory (e.g., address mirroring).	Choose only if system-level logic already accommodates inverted data paths or enables downstream correction.

Compared with SN74LVC244AQPWREP and 74LVC541APWRE4, the SN74LVC540AQPWREP uniquely provides AND-gated dual-OE control for fail-safe global 3-state activation and noninverting signal integrity - essential for deterministic bus arbitration and memory address routing in safety-critical systems.

Availability

SN74LVC540AQPWREP is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body controllers, avionics DAQ units, and ruggedized medical imaging systems requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for SN74LVC540AQPWREP 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 company specializing in analog, embedded processing, and digital signal technologies, with leadership in high-reliability, extended-temperature, and space-grade components.

The SN74LVC540AQPWREP belongs to TI's enhanced-product (EP) logic portfolio, engineered for mission-critical applications demanding guaranteed longevity, extended temperature operation, and rigorous process controls - including aerospace, defense, and transportation systems.

FAQ

What is the recommended power-up sequence for SN74LVC540AQPWREP to ensure reliable 3-state initialization?

TI specifies that OE1 and OE2 must be held high (or pulled up to V_CC) during power-up to guarantee all outputs remain in high-impedance state until valid control signals are established. For SN74LVC540AQPWREP, use a minimum 10-kΩ pull-up resistor from each OE pin to V_CC; this prevents floating enables that could cause bus contention. The device's internal power-on reset does not manage OE states - external biasing is mandatory per SCAS747A Section 7.1.

Does SN74LVC540AQPWREP support hot-insertion in live backplane systems?

Yes - SN74LVC540AQPWREP supports hot-insertion via its I_off circuitry, which disables outputs when V_CC = 0 V, blocking damaging current flow from live backplane traces into the unpowered device. This behavior is verified per JEDEC JESD78 and meets IPC-TR-579 Class II requirements. However, OE pins must be externally clamped to prevent transient-induced enable glitches during insertion.

Can SN74LVC540AQPWREP drive standard 50-Ω transmission lines directly?

No - SN74LVC540AQPWREP is not designed for 50-Ω line driving. Its output impedance (~10 Ω typical) and ±24-mA drive strength are optimized for CMOS bus loading (≤10 pF per load), not RF transmission lines. Driving 50-Ω lines would cause severe reflections and overshoot. For such applications, use a dedicated line-driver IC like SN65LVDS1 or DS26LS31, not SN74LVC540AQPWREP.

What is the maximum capacitive load SN74LVC540AQPWREP can drive while maintaining t_pd ≤ 7.1 ns?

Per TI's SCAS747A switching characteristics table, SN74LVC540AQPWREP maintains t_pd ≤ 7.1 ns (V_CC = 2.7 V) with C_L = 50 pF, as tested using the standard load circuit in Figure 1. Exceeding 50 pF increases propagation delay nonlinearly - at 100 pF, t_pd degrades to ~12 ns. For designs requiring >50-pF loads, add series termination or reduce trace length to limit C_L seen by SN74LVC540AQPWREP.

Is SN74LVC540AQPWREP pin-compatible with commercial-grade SN74LVC540APWRE4?

Yes - SN74LVC540AQPWREP and SN74LVC540APWRE4 share identical TSSOP-20 (PW) package dimensions, pinout, and solder footprint per TI's DWG # PW0020A. Both use the same 0.65-mm pitch and Q1 pin-1 quadrant orientation. However, SN74LVC540AQPWREP is enhanced-product qualified for –40°C to 125°C with DMS and pedigree reporting, whereas SN74LVC540APWRE4 is commercial-grade (0°C to 70°C) and lacks extended reliability testing.

SN74LVC540AQPWREP Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVC

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Logic Type:: Buffer, Inverting

Number of Elements:: 1

Number of Bits per Element:: 8

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 24mA, 24mA

Voltage - Supply:: 2V ~ 3.6V

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-TSSOP

SN74LVC540AQPWREP FAQ

1.How can I place an order for SN74LVC540AQPWREP through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVC540AQPWREP 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 SN74LVC540AQPWREP reliable?

The price and inventory of SN74LVC540AQPWREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC540AQPWREP is usually 5 days.

3.What payment methods are accepted for SN74LVC540AQPWREP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC540AQPWREP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LVC540AQPWREP?

SN74LVC540AQPWREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVC540AQPWREP 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 SN74LVC540AQPWREP?

For technical support, including SN74LVC540AQPWREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC540AQPWREP requirements.

6.How does Aetrix verify that SN74LVC540AQPWREP is sourced from the original manufacturer or authorized distributors?

All SN74LVC540AQPWREP 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 SN74LVC540AQPWREP meets industry standards.

7.What is the process for return or replacement of SN74LVC540AQPWREP?

All SN74LVC540AQPWREP units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC540AQPWREP, 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 SN74LVC540AQPWREP part is unused and in its original packaging.

Return procedure for SN74LVC540AQPWREP:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…