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

onsemi 74LVTH240MTC

Name: 74LVTH240MTC
Brand: onsemi
SKU: 74LVTH240MTC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LVTH240MTC

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74LVTH240MTC.pdf

Description:: IC BUFFER INVERT 3.6V 20TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74LVTH240MTC from Fairchild Semiconductor is an inverting octal buffer/line driver with 3-STATE outputs, designed for 3.3V V_CC operation while interfacing to 5V TTL systems. It features bushold inputs (eliminating external pull-ups), ±32mA/64mA drive capability, and operates across –40°C to +85°C for memory address and clock distribution in dense PCB layouts.

For engineers reviewing the 74LVTH240MTC datasheet, pinout, applications, or equivalent options, key selection factors include bushold-enabled input retention, TSSOP-20 package compatibility, 3.3V–5V mixed-voltage bus driving, and high-speed propagation delay under 4.6ns at 3.3V.

Technical Context

The 74LVTH240MTC implements dual 4-bit inverting buffers with independent 3-STATE control (OE1/OE2), enabling selective bus isolation. Its bushold circuitry maintains stable logic states on unconnected inputs without external biasing - a critical feature for hot-pluggable or partially populated designs.

Designed in advanced BiCMOS technology, it delivers ABT-class speed (t_PLH/t_PHL ≤ 4.6ns) with low power dissipation (I_CCZ = 0.19mA in 3-STATE). Input voltage tolerance up to 5.5V and output drive of –32mA/64mA support robust interfacing between 3.3V logic and legacy 5V loads.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7V–3.6V - Ensures stable operation in standard 3.3V supply rails with ±0.3V margin.
Input Voltage Range	0V–5.5V - Allows direct connection to 5V TTL outputs without level-shifting circuitry.
Output Drive	–32mA (HIGH), +64mA (LOW) - Sinks sufficient current for driving multiple TTL loads or terminated transmission lines.
Propagation Delay	≤4.6ns (t_PLH, V_CC = 2.7V, CL = 50pF) - Supports high-speed address/data buffering in sub-200MHz bus systems.
Bushold Current	±75µA at 3.0V - Actively holds floating inputs at valid logic levels, removing need for external pull-up resistors.
Operating Temperature	–40°C to +85°C - Qualified for industrial-grade embedded control and communications equipment.
ESD Rating	Human-body model > 2000V - Provides robust handling tolerance during assembly and field service.

Pinout & Package

74LVTH240MTC is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4mm wide, with 0.65mm lead pitch - optimized for high-density PCB layouts and automated surface-mount assembly.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 4, 6, 8, 10, 13, 15 (I0–I7)	Inverting Data Inputs	Accept TTL/CMOS logic; bushold retains state when unconnected - reduces BOM count and layout complexity.
3, 5, 7, 9, 12, 14, 16, 18 (O0–O7)	Inverting 3-STATE Outputs	Drive bidirectional buses; enter high-impedance when OE1/OE2 = HIGH - prevents bus contention.
11, 19 (OE1, OE2)	Active-Low Output Enable	Independent control of two 4-bit groups; enables partial bus isolation without full device disable.
10, 20 (GND, V_CC)	Power Supply Terminals	Dual ground and supply pins reduce switching noise and improve signal integrity in high-drive scenarios.

Key Features

Feature	Design Value
Bushold input circuitry	Eliminates external pull-up resistors on unused inputs - simplifies design, saves board space, and improves reliability in hot-swap applications.
Live insertion/extraction support	Enables safe replacement or upgrade of the 74LVTH240MTC in powered-backplane systems without system shutdown.
Glitch-free power-up/down	Outputs remain in high-impedance during V_CC ramp-up/down - prevents bus contention and data corruption during power sequencing.
5V-tolerant inputs & 3.3V-compatible outputs	Interoperates directly with both legacy 5V TTL and modern 3.3V logic families - avoids discrete level translators in mixed-voltage systems.
Latch-up immunity >500mA	Meets stringent JEDEC JESD78 requirements - ensures robustness against transient overvoltage and ESD-induced latch-up events.

Applications

Memory Address Buffering	Backplane Clock Distribution
Use Scenario: Driving address lines from a 3.3V microcontroller to multiple 5V SRAM or EPROM devices on a shared memory bus. IC Role / Device Role / Timing Role: Inverting octal buffer with 3-STATE control isolates address bus segments and prevents contention during memory access arbitration. Use Value: Bushold inputs maintain valid address states during reset or standby, and ±64mA drive ensures clean edges across long traces or fan-out >10.	Use Scenario: Distributing a system clock signal from a 3.3V oscillator to multiple 5V peripheral controllers on a modular backplane. IC Role / Device Role / Timing Role: Low-skew (<1.0ns) inverting line driver conditions and fans out clock signals while maintaining edge integrity and timing margins. Use Value: Propagation delay ≤4.6ns and low output capacitance (6pF) minimize jitter accumulation across distributed clock trees.
Hot-Swappable I/O Module Interface	Industrial Bus Transceiver Support
Use Scenario: Enabling live insertion of I/O expansion cards into a powered industrial PLC rack with shared data/address buses. IC Role / Device Role / Timing Role: 3-STATE buffer provides controlled bus entry/exit; bushold preserves module identity during plug/unplug sequences. Use Value: Glitch-free power-up/down behavior and live insertion compliance prevent bus glitches that could trigger spurious interrupts or watchdog resets.	Use Scenario: Interfacing a 3.3V FPGA's local bus to a legacy 5V RS-485 or CAN transceiver interface requiring TTL-level control signals. IC Role / Device Role / Timing Role: Level-translating buffer drives enable/disable and direction-control lines with precise timing and voltage compatibility. Use Value: 5.5V-tolerant inputs accept transceiver status flags directly; 64mA sink capability reliably pulls down open-collector control lines.

Memory Address Buffering

Backplane Clock Distribution

Use Scenario: Driving address lines from a 3.3V microcontroller to multiple 5V SRAM or EPROM devices on a shared memory bus.

IC Role / Device Role / Timing Role: Inverting octal buffer with 3-STATE control isolates address bus segments and prevents contention during memory access arbitration.

Use Value: Bushold inputs maintain valid address states during reset or standby, and ±64mA drive ensures clean edges across long traces or fan-out >10.

Use Scenario: Distributing a system clock signal from a 3.3V oscillator to multiple 5V peripheral controllers on a modular backplane.

IC Role / Device Role / Timing Role: Low-skew (<1.0ns) inverting line driver conditions and fans out clock signals while maintaining edge integrity and timing margins.

Use Value: Propagation delay ≤4.6ns and low output capacitance (6pF) minimize jitter accumulation across distributed clock trees.

Hot-Swappable I/O Module Interface

Industrial Bus Transceiver Support

Use Scenario: Enabling live insertion of I/O expansion cards into a powered industrial PLC rack with shared data/address buses.

IC Role / Device Role / Timing Role: 3-STATE buffer provides controlled bus entry/exit; bushold preserves module identity during plug/unplug sequences.

Use Value: Glitch-free power-up/down behavior and live insertion compliance prevent bus glitches that could trigger spurious interrupts or watchdog resets.

Use Scenario: Interfacing a 3.3V FPGA's local bus to a legacy 5V RS-485 or CAN transceiver interface requiring TTL-level control signals.

IC Role / Device Role / Timing Role: Level-translating buffer drives enable/disable and direction-control lines with precise timing and voltage compatibility.

Use Value: 5.5V-tolerant inputs accept transceiver status flags directly; 64mA sink capability reliably pulls down open-collector control lines.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC240APWR	No bushold; CMOS-based; lower drive (±24mA); 1.65V–3.6V V_CC	Suitable only for pure 3.3V systems; requires external pull-ups for unused inputs.	Select when cost-sensitive, low-power, and no 5V interfacing is needed.
74ALVT240MTCX	Higher speed (t_PD ≤ 2.8ns); same bushold; 2.3V–3.6V V_CC; higher ICC in active state	Better for >250MHz clock distribution but less tolerant of 5V input overdrive.	Select when sub-3ns timing is critical and 5V input tolerance is not required.

Compared with SN74LVC240APWR and 74ALVT240MTCX, the 74LVTH240MTC uniquely balances 5V-tolerant inputs, bushold functionality, and industrial temperature range - making it optimal for mixed-voltage, hot-swap-capable embedded bus interfaces where reliability and design simplicity are prioritized over ultra-low power or maximum speed.

Availability

74LVTH240MTC is available at Aetrix Electronics and suitable for memory subsystems, industrial backplanes, hot-swappable I/O modules, and mixed-voltage bus interface designs requiring stable component supply and long-term lifecycle support.

Supply support for 74LVTH240MTC 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 leading analog and power IC manufacturer, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and communications infrastructure.

The 74LVTH240MTC belongs to the LVT/H series of low-voltage BiCMOS buffers - engineered specifically for high-density, mixed-voltage board designs where 3.3V logic must interoperate with 5V legacy systems without external level-shifting components.

FAQ

What is the function of bushold in the 74LVTH240MTC?

The bushold circuitry in the 74LVTH240MTC actively maintains the last valid logic state on each input pin when left unconnected - eliminating the need for external pull-up or pull-down resistors. This feature reduces component count, saves PCB area, and enhances reliability in systems with configurable or partially populated I/O, such as modular backplanes or field-upgradeable hardware. The 74LVTH240MTC leverages this to simplify design while ensuring deterministic input behavior.

Does the 74LVTH240MTC support live insertion in powered systems?

Yes, the 74LVTH240MTC supports live insertion and extraction per its datasheet specifications. Its power-up/down high-impedance behavior ensures outputs remain in 3-STATE during V_CC ramp-up or ramp-down, preventing bus contention or signal corruption. This makes the 74LVTH240MTC suitable for hot-pluggable I/O modules, carrier cards, and reconfigurable industrial control systems where uninterrupted operation is essential.

What is the maximum output drive capability of the 74LVTH240MTC?

The 74LVTH240MTC delivers –32mA source current (HIGH-level) and +64mA sink current (LOW-level) per output, measured at V_CC = 3.0V. This drive strength allows direct interfacing with multiple TTL loads, terminated transmission lines, or open-collector control inputs without external drivers. The 74LVTH240MTC sustains this performance across its full operating temperature range (–40°C to +85°C), supporting robust industrial bus applications.

Can the 74LVTH240MTC interface directly with 5V logic devices?

Yes, the 74LVTH240MTC accepts input voltages up to 5.5V while operating from a 3.3V supply, enabling seamless interfacing with 5V TTL outputs without level shifters. Its outputs swing rail-to-rail (0V to V_CC) but can drive 5V-tolerant inputs via current-limiting or passive termination. This dual-voltage capability is explicitly validated in the 74LVTH240MTC datasheet and forms the basis of its use in mixed-voltage memory and peripheral buses.

What package type is used for the 74LVTH240MTC?

The 74LVTH240MTC uses a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, with 4.4mm body width and 0.65mm lead pitch. This compact, surface-mount package supports high-density PCB layouts and automated assembly, and is pin-compatible with other TSSOP-20 logic devices. The 74LVTH240MTC's MTC20 package designation confirms this mechanical and thermal profile for thermal and routing consistency in production designs.

74LVTH240MTC Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LVTH

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

Packaging:: Bulk

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:: 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

74LVTH240MTC FAQ

1.How can I place an order for 74LVTH240MTC through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LVTH240MTC 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 74LVTH240MTC reliable?

The price and inventory of 74LVTH240MTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVTH240MTC is usually 5 days.

3.What payment methods are accepted for 74LVTH240MTC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVTH240MTC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LVTH240MTC?

74LVTH240MTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LVTH240MTC 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 74LVTH240MTC?

For technical support, including 74LVTH240MTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVTH240MTC requirements.

6.How does Aetrix verify that 74LVTH240MTC is sourced from the original manufacturer or authorized distributors?

All 74LVTH240MTC 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 74LVTH240MTC meets industry standards.

7.What is the process for return or replacement of 74LVTH240MTC?

All 74LVTH240MTC units undergo pre-shipment inspection (PSI). If there is an issue with 74LVTH240MTC, 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 74LVTH240MTC part is unused and in its original packaging.

Return procedure for 74LVTH240MTC:

1.Submit a request within 90 days.

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

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