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

onsemi 74VHCT540AMTCX

Name: 74VHCT540AMTCX
Brand: onsemi
SKU: 74VHCT540AMTCX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VHCT540AMTCX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74VHCT540AMTCX.pdf

Description:: IC BUFFER INVERT 5.5V 20TSSOP

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Product details

Overview

74VHCT540AMTCX from Fairchild Semiconductor is an octal non-inverting 3-STATE buffer/line driver in TSSOP-20 package, operating at 4.5–5.5V supply, with 5.4ns typical propagation delay, ±25mA output drive, and input/output voltage tolerance up to 7V. It serves as a memory address driver and bus transceiver in 5V digital systems.

For engineers reviewing the 74VHCT540AMTCX datasheet, pinout, applications, or equivalent options, key selection criteria include 3-STATE timing (tPZL/tPLZ ≤ 14ns), input protection for mixed-voltage interfacing, low ICC (4µA max), and flow-through pinout enabling microprocessor port layout optimization.

Technical Context

The 74VHCT540AMTCX implements dual 3-STATE enable logic (OE1/OE2) controlling eight independent non-inverting buffers. Its silicon gate CMOS process delivers TTL-compatible speed while maintaining CMOS-level static power consumption.

It supports 3V-to-5V system interfacing via overvoltage-tolerant inputs/outputs (–0.5V to +7.0V), with power-down protection active when VCC = 0V or outputs are disabled. Unused inputs must be tied HIGH or LOW per design specification.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5V to 5.5V - ensures compatibility with standard 5V logic rails and margin for ripple.
Propagation Delay	5.4ns typ. at CL = 15pF - enables high-speed address/data buffering in memory subsystems.
Output Drive	±25mA - sufficient to drive 50Ω transmission lines or multiple TTL loads.
Input Voltage Range	–0.5V to +7.0V - allows safe interfacing between 3V controllers and 5V buses without level shifters.
Quiescent Current	4µA max at TA = 25°C - minimizes standby power in battery-backed or low-power embedded systems.
3-STATE Enable Time	8.3ns typ. (tPZL) - supports fast bus arbitration and multiplexing in real-time control applications.
Operating Temperature	–40°C to +85°C - qualified for industrial-grade operation without derating.

Pinout & Package

74VHCT540AMTCX is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4mm wide, with 0.65mm lead pitch and exposed pad not present.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	OE1, OE2	Active-Low 3-STATE enable inputs - both must be LOW to activate all eight outputs.
2–9	I0–I7	Buffer inputs - flow-through arrangement places them on left side, opposite outputs for PCB routing efficiency.
11–18	O0–O7	Non-inverting 3-STATE outputs - high-impedance state isolates bus segments during contention.
10	GND	Ground reference - decoupling capacitor must be placed adjacent to this pin.
20	VCC	Positive supply - requires local 0.1µF ceramic bypass capacitor.

Key Features

Feature	Design Value
Flow-through pinout	Inputs (pins 2–9) and outputs (pins 11–18) on opposite sides - reduces trace crossovers and improves signal integrity in dense layouts.
Overvoltage-tolerant I/O	Withstands –0.5V to +7.0V on inputs/outputs regardless of VCC - enables robust 3V/5V mixed-signal interfacing without external clamps.
Low dynamic power	CPD = 19pF - limits switching current in high-frequency bus applications, reducing EMI and heat generation.
Power-down protection	Functional when VCC = 0V or outputs disabled - prevents back-driving and latch-up during hot-insertion or partial power loss.

Applications

Memory Address Buffering	Microprocessor Output Port
Use Scenario: Driving 16-bit address bus from a microcontroller to SRAM or Flash memory in embedded control systems. IC Role / Device Role / Timing Role: Non-inverting octal buffer with simultaneous 3-STATE control, providing clean, slew-controlled signals with <8.5ns propagation delay. Use Value: Eliminates address skew across byte lanes and supports 100+ MHz bus timing margins due to matched tPLH/tPHL and low output skew (<1.0ns).	Use Scenario: Expanding GPIO capability of an 8-bit MCU to drive LEDs, relays, or peripheral select lines. IC Role / Device Role / Timing Role: 3-STATE line driver with dual enable inputs - allows time-multiplexed sharing of a single 8-bit data bus among multiple peripherals. Use Value: Flow-through pinout simplifies fan-out routing; ±25mA drive per output eliminates need for discrete transistor buffers.
Bus Transceiver Interface	Legacy System Voltage Translation
Use Scenario: Bidirectional data bus isolation between two 5V subsystems using separate OE controls. IC Role / Device Role / Timing Role: Unidirectional buffer used in pairs - one for transmit, one for receive - with OE1/OE2 enabling directional control. Use Value: 14ns max disable time (tPHZ) ensures clean bus release before next device asserts, preventing contention glitches.	Use Scenario: Interfacing a 3.3V FPGA I/O bank to legacy 5V peripheral logic (e.g., EEPROM, DAC) without level-shifter ICs. IC Role / Device Role / Timing Role: Voltage-tolerant buffer - accepts 3.3V logic HIGH (VIH = 2.0V min) and drives 5V-compliant outputs (VOH ≥ 3.94V at 8mA). Use Value: Input overvoltage rating (up to +7V) protects FPGA pins during power sequencing mismatches or transient events.

Memory Address Buffering

Microprocessor Output Port

Use Scenario: Driving 16-bit address bus from a microcontroller to SRAM or Flash memory in embedded control systems.

IC Role / Device Role / Timing Role: Non-inverting octal buffer with simultaneous 3-STATE control, providing clean, slew-controlled signals with <8.5ns propagation delay.

Use Value: Eliminates address skew across byte lanes and supports 100+ MHz bus timing margins due to matched tPLH/tPHL and low output skew (<1.0ns).

Use Scenario: Expanding GPIO capability of an 8-bit MCU to drive LEDs, relays, or peripheral select lines.

IC Role / Device Role / Timing Role: 3-STATE line driver with dual enable inputs - allows time-multiplexed sharing of a single 8-bit data bus among multiple peripherals.

Use Value: Flow-through pinout simplifies fan-out routing; ±25mA drive per output eliminates need for discrete transistor buffers.

Bus Transceiver Interface

Legacy System Voltage Translation

Use Scenario: Bidirectional data bus isolation between two 5V subsystems using separate OE controls.

IC Role / Device Role / Timing Role: Unidirectional buffer used in pairs - one for transmit, one for receive - with OE1/OE2 enabling directional control.

Use Value: 14ns max disable time (tPHZ) ensures clean bus release before next device asserts, preventing contention glitches.

Use Scenario: Interfacing a 3.3V FPGA I/O bank to legacy 5V peripheral logic (e.g., EEPROM, DAC) without level-shifter ICs.

IC Role / Device Role / Timing Role: Voltage-tolerant buffer - accepts 3.3V logic HIGH (VIH = 2.0V min) and drives 5V-compliant outputs (VOH ≥ 3.94V at 8mA).

Use Value: Input overvoltage rating (up to +7V) protects FPGA pins during power sequencing mismatches or transient events.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HCT540PWR	Same 20-pin TSSOP package; identical DC specs but tPD = 6.5ns (slower); no guaranteed 7V input tolerance.	Valid for standard 5V-only systems; unsuitable where 3V/5V interface robustness is required.	Select when cost is primary and overvoltage protection is unnecessary.
74LCX541MTCX	Lower VCC range (2.0–3.6V); 3.3V-native; incompatible with 5V supply; different pinout (inverting vs. non-inverting).	Designed for 3.3V LVTTL systems only; cannot replace 74VHCT540AMTCX in 5V designs.	Choose only for new 3.3V designs requiring lower voltage operation and reduced power.

Compared with SN74HCT540PWR and 74LCX541MTCX, the 74VHCT540AMTCX uniquely combines 5V operation, 7V I/O tolerance, and flow-through pinout - making it irreplaceable in industrial 5V bus systems requiring mixed-voltage resilience and layout efficiency.

Availability

74VHCT540AMTCX is available at Aetrix Electronics and suitable for memory subsystems, microprocessor I/O expansion, bus transceivers, and mixed-voltage interface circuits requiring stable component supply across industrial temperature ranges.

Supply support for 74VHCT540AMTCX 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

Fairchild Semiconductor was a U.S.-based analog and power IC manufacturer acquired by ON Semiconductor in 2016; its VHCT logic family remains widely deployed in industrial and legacy designs.

The VHCT series was engineered for pin-compatible migration from bipolar TTL into CMOS-based systems - delivering TTL speed with CMOS power efficiency and enhanced noise immunity for 5V digital infrastructure.

FAQ

What is the maximum clock frequency supported by the 74VHCT540AMTCX?

The 74VHCT540AMTCX does not operate on a clock; it is an asynchronous buffer. Its usable data rate depends on propagation delay (5.4ns typ.) and system setup/hold timing. For clean edge transitions driving 50pF loads, it reliably supports data valid windows >10ns, enabling effective use in 100MHz bus systems with proper layout and termination.

Can the 74VHCT540AMTCX safely interface a 3.3V microcontroller to a 5V peripheral?

Yes. The 74VHCT540AMTCX accepts 3.3V logic HIGH inputs (VIH min = 2.0V) and drives 5V-compatible outputs (VOH ≥ 3.94V at 8mA). Its inputs tolerate up to +7.0V regardless of VCC, protecting the 3.3V controller during power-up sequencing or fault conditions - no external level-shifting components are needed.

What is the function of OE1 and OE2 on the 74VHCT540AMTCX?

OE1 (pin 1) and OE2 (pin 19) are active-low 3-STATE enable inputs. Both must be LOW to enable all eight outputs (O0–O7). If either is HIGH, all outputs enter high-impedance state. This dual-enable architecture allows flexible bus arbitration - e.g., OE1 for write-enable, OE2 for read-enable - without external logic.

Is the 74VHCT540AMTCX RoHS compliant and Pb-free?

Yes. Per the ordering information in the datasheet, the "X" suffix in 74VHCT540AMTCX denotes tape-and-reel packaging with Pb-free construction compliant with JEDEC J-STD-020B. The device uses matte tin lead finish and meets RoHS Directive 2011/65/EU requirements.

Does the 74VHCT540AMTCX require external pull-up or pull-down resistors on unused inputs?

Yes. The datasheet explicitly states: "Unused inputs must be held HIGH or LOW. They may not float." Floating inputs can cause excessive ICC, oscillation, or unpredictable output states. Tie unused inputs directly to VCC or GND - do not rely on internal weak pull-ups, as none are specified for the 74VHCT540AMTCX.

74VHCT540AMTCX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74VHCT

Package/Case:: 20-TSSOP (0.173", 4.40mm 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:: 8mA, 8mA

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-TSSOP

74VHCT540AMTCX FAQ

1.How can I place an order for 74VHCT540AMTCX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VHCT540AMTCX 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 74VHCT540AMTCX reliable?

The price and inventory of 74VHCT540AMTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT540AMTCX is usually 5 days.

3.What payment methods are accepted for 74VHCT540AMTCX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT540AMTCX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VHCT540AMTCX?

74VHCT540AMTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VHCT540AMTCX 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 74VHCT540AMTCX?

For technical support, including 74VHCT540AMTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT540AMTCX requirements.

6.How does Aetrix verify that 74VHCT540AMTCX is sourced from the original manufacturer or authorized distributors?

All 74VHCT540AMTCX 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 74VHCT540AMTCX meets industry standards.

7.What is the process for return or replacement of 74VHCT540AMTCX?

All 74VHCT540AMTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT540AMTCX, 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 74VHCT540AMTCX part is unused and in its original packaging.

Return procedure for 74VHCT540AMTCX:

1.Submit a request within 90 days.

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

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