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

onsemi 74VHCT240AM

Name: 74VHCT240AM
Brand: onsemi
SKU: 74VHCT240AM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VHCT240AM

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: 74VHCT240AM.pdf

Description:: IC BUFFER INVERT 5.5V 20SOIC

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Product details

Overview

74VHCT240AM from onsemi is an octal inverting 3-STATE buffer/line driver with two active-low output enables, designed for memory address driving, clock distribution, and bus-oriented transmitter/receiver applications. It operates at 4.5–5.5 V, delivers 3.6 ns typical propagation delay, supports 5 V ↔ 3 V level translation, and features ±25 mA output drive per pin.

For engineers reviewing the 74VHCT240AM datasheet, pinout, applications, or equivalent options, key selection criteria include 3-STATE timing (tPZL/tPLZ), input/output voltage tolerance (−0.5 V to 6.5 V), power-down protection, and TSSOP20 package compatibility with legacy 74HCT240 footprints.

Technical Context

The 74VHCT240AM implements dual independent 3-STATE enable logic (OE1/OE2) controlling eight inverting buffered channels (I0–I7 → O0–O7). Its silicon gate CMOS process enables TTL-compatible speed (7.8 ns max tPLH at 5 V, CL = 15 pF) while maintaining low ICC (4.0 µA max at 25°C).

Input and output protection circuits allow safe operation across mismatched supply and signal voltages (e.g., 5 V VCC with 3 V inputs), enabling robust interfacing between mixed-voltage systems without external clamping diodes or level shifters.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	4.5 V to 5.5 V - Ensures stable operation across industrial-grade 5 V rail tolerances.
tPLH / tPHL (Typ)	3.6 ns at VCC = 5 V, CL = 50 pF - Enables high-speed bus buffering up to ~100 MHz system clocks.
IOL / IOH	±8 mA - Sufficient drive strength for fan-out of ≥10 LSTTL loads or direct connection to 50 Ω transmission lines.
VIH / VIL	2.0 V / 0.8 V - TTL-compatible input thresholds ensure reliable logic recognition from legacy 5 V sources.
IOZ (Off-State)	±2.5 µA max - Minimizes leakage current in 3-STATE mode, critical for low-power standby states.
ESD Rating	2000 V HBM - Provides baseline ESD robustness for handling and board-level integration.

Pinout & Package

TSSOP20 (4.4 mm × 6.5 mm, Case 948AQ), Pb-free, surface-mount package with 0.65 mm pitch; compliant with JEDEC MO-153.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	OE1, OE2	Active-low 3-STATE enables - Both must be LOW to activate outputs; independent control allows partial bus gating.
2–9	I0–I7	Inverting input terminals - Each drives corresponding inverted output (e.g., I0 → O0).
11–18	O0–O7	3-STATE inverting outputs - High-impedance when either OE1 or OE2 is HIGH.
10	GND	Ground reference - Shared return path for all inputs, outputs, and supply current.
20	VCC	Positive supply - Must be decoupled locally (0.1 µF ceramic) due to fast switching transients.

Key Features

Feature	Design Value
High-speed CMOS architecture	3.6 ns typical propagation delay matches Bipolar Schottky TTL performance while cutting power by >90% vs. equivalent 74LS devices.
Wide input/output voltage tolerance	−0.5 V to +6.5 V absolute max ratings - Eliminates need for external clamping when interfacing with overvoltage or battery-backed subsystems.
Power-down protection	Inputs and outputs remain protected even with VCC = 0 V - Prevents back-driving damage during hot-swap or partial power-down sequences.
Pb-free TSSOP20 packaging	RoHS-compliant footprint identical to industry-standard 74HCT240 - Enables drop-in replacement without PCB redesign.

Applications

Memory Address Buffering	Clock Distribution Network
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or Flash ICs sharing a common bus. IC Role / Device Role / Timing Role: Inverting 3-STATE buffer isolating address bus segments and enabling chip-select-based arbitration. Use Value: Prevents bus contention during memory access cycles; 8-channel parallel drive reduces trace count versus discrete buffers.	Use Scenario: Distributing a master system clock to multiple peripheral controllers with matched skew. IC Role / Device Role / Timing Role: Low-skew (≤1.0 ns) inverting buffer ensuring synchronous edge alignment across clock domains. Use Value: tOSLH/tOSHL ≤ 1.0 ns guarantees minimal inter-channel clock skew, preserving setup/hold margins in multi-controller systems.
5 V ↔ 3 V Level Translation	Bus-Oriented Transceiver Interface
Use Scenario: Interfacing a 5 V FPGA I/O bank to a 3 V sensor hub or ADC. IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional translator using 3-STATE control to manage directionality without external logic. Use Value: Input/output rating up to 6.5 V allows safe 5 V signaling into 3 V domain; no level-shifter ICs or resistive dividers required.	Use Scenario: Bidirectional data exchange between a CPU and peripheral ASIC over a shared 8-bit data bus. IC Role / Device Role / Timing Role: Octal inverting transceiver with dual OE pins enabling half-duplex bus arbitration and direction control. Use Value: Independent OE1/OE2 permits selective channel enablement - e.g., OE1 for CPU→peripheral writes, OE2 for peripheral→CPU reads.

Memory Address Buffering

Clock Distribution Network

Use Scenario: Driving address lines from a microcontroller to multiple SRAM or Flash ICs sharing a common bus.

IC Role / Device Role / Timing Role: Inverting 3-STATE buffer isolating address bus segments and enabling chip-select-based arbitration.

Use Value: Prevents bus contention during memory access cycles; 8-channel parallel drive reduces trace count versus discrete buffers.

Use Scenario: Distributing a master system clock to multiple peripheral controllers with matched skew.

IC Role / Device Role / Timing Role: Low-skew (≤1.0 ns) inverting buffer ensuring synchronous edge alignment across clock domains.

Use Value: tOSLH/tOSHL ≤ 1.0 ns guarantees minimal inter-channel clock skew, preserving setup/hold margins in multi-controller systems.

5 V ↔ 3 V Level Translation

Bus-Oriented Transceiver Interface

Use Scenario: Interfacing a 5 V FPGA I/O bank to a 3 V sensor hub or ADC.

IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional translator using 3-STATE control to manage directionality without external logic.

Use Value: Input/output rating up to 6.5 V allows safe 5 V signaling into 3 V domain; no level-shifter ICs or resistive dividers required.

Use Scenario: Bidirectional data exchange between a CPU and peripheral ASIC over a shared 8-bit data bus.

IC Role / Device Role / Timing Role: Octal inverting transceiver with dual OE pins enabling half-duplex bus arbitration and direction control.

Use Value: Independent OE1/OE2 permits selective channel enablement - e.g., OE1 for CPU→peripheral writes, OE2 for peripheral→CPU reads.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74HCT240PW,118 (Nexperia)	Same logic function, TSSOP20 package, but rated only to 70°C ambient; no guaranteed 85°C operation.	Limited to commercial-temperature applications; not qualified for extended industrial environments.	Select when operating temperature stays ≤70°C and cost sensitivity outweighs extended thermal margin.
SN74HCT240N (Texas Instruments)	DIP-20 package only; no surface-mount option; higher parasitic inductance limits max frequency to ~60 MHz.	Not suitable for space-constrained or high-frequency PCB layouts requiring TSSOP.	Choose only for through-hole prototyping or legacy DIP-based systems where rework tolerance is prioritized over density or speed.

Compared with 74HCT240PW,118 and SN74HCT240N, the 74VHCT240AM offers full −40°C to +85°C operation in a compact TSSOP20 package with superior AC performance (3.6 ns typ tPD), making it optimal for industrial embedded designs requiring reliability, density, and timing precision.

Availability

74VHCT240AM is available at Aetrix Electronics and suitable for memory address buffering, clock distribution networks, and 5 V ↔ 3 V level translation requiring stable component supply and long-term industrial availability.

Supply support for 74VHCT240AM 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient technologies for automotive, industrial, cloud, and IoT applications.

The VHCT logic family, including the 74VHCT240AM, was engineered for high-speed, low-power 5 V CMOS systems requiring TTL compatibility, mixed-voltage interfacing, and robust operation across extended temperature ranges.

FAQ

What is the maximum operating temperature range for the 74VHCT240AM?

The 74VHCT240AM is specified for continuous operation from −40°C to +85°C ambient temperature. This industrial-grade range is confirmed in the Recommended Operating Conditions table of the onsemi datasheet (Rev. 2, August 2024), making it suitable for deployment in harsh environments such as factory automation controllers or outdoor communication equipment where thermal cycling occurs.

Does the 74VHCT240AM support true bidirectional data flow like a transceiver?

No - the 74VHCT240AM is an octal inverting buffer with unidirectional signal flow (I0–I7 → O0–O7) and dual active-low 3-STATE enables (OE1/OE2). While it can be used in bus-oriented systems, it lacks internal direction control logic. True bidirectional transceivers (e.g., 74VHCT245A) require separate DIR pins; the 74VHCT240AM relies on external logic to coordinate OE1/OE2 for half-duplex arbitration.

Can the 74VHCT240AM safely interface a 5 V microcontroller with a 3 V ADC without external level shifters?

Yes - the 74VHCT240AM accepts input voltages from −0.5 V to +6.5 V regardless of VCC, and its outputs swing rail-to-rail (0 V to VCC) with TTL-compatible thresholds. When powered at 5 V, it reliably translates 5 V logic highs to 5 V outputs that a 3 V ADC's 5 V-tolerant inputs can accept, provided the ADC's VIH/VIL specs align with 74VHCT240AM's VOH/VOL values at 8 mA load.

What is the typical propagation delay of the 74VHCT240AM and under what test conditions is it measured?

The typical propagation delay (tPLH/tPHL) of the 74VHCT240AM is 3.6 ns, measured at VCC = 5 V with CL = 50 pF and TA = 25°C, per the AC Electrical Characteristics table in the onsemi datasheet. This value reflects average transition time from input change to valid output transition under standard loading, confirming suitability for sub-100 MHz digital interfaces.

Is the 74VHCT240AM pin-compatible with the older 74HCT240 series?

Yes - the 74VHCT240AM is explicitly stated as "pin and function compatible with 74HCT240" in the onsemi datasheet. Its TSSOP20 footprint (Case 948AQ), pin numbering, logic behavior, and DC/AC specifications align with industry-standard 74HCT240 variants, enabling direct replacement in existing designs without layout changes or firmware updates.

74VHCT240AM Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74VHCT

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: Buffer, Inverting

Number of Elements:: 2

Number of Bits per Element:: 4

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-SOIC

74VHCT240AM FAQ

1.How can I place an order for 74VHCT240AM through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VHCT240AM 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 74VHCT240AM reliable?

The price and inventory of 74VHCT240AM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT240AM is usually 5 days.

3.What payment methods are accepted for 74VHCT240AM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT240AM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VHCT240AM?

74VHCT240AM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VHCT240AM 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 74VHCT240AM?

For technical support, including 74VHCT240AM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT240AM requirements.

6.How does Aetrix verify that 74VHCT240AM is sourced from the original manufacturer or authorized distributors?

All 74VHCT240AM 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 74VHCT240AM meets industry standards.

7.What is the process for return or replacement of 74VHCT240AM?

All 74VHCT240AM units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT240AM, 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 74VHCT240AM part is unused and in its original packaging.

Return procedure for 74VHCT240AM:

1.Submit a request within 90 days.

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

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