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

onsemi 74LVT240MSAX

Name: 74LVT240MSAX
Brand: onsemi
SKU: 74LVT240MSAX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LVT240MSAX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74LVT240MSAX.pdf

Description:: IC BUFFER INVERT 3.6V 20SSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74LVT240MSAX from Fairchild Semiconductor is an inverting octal buffer/line driver with 3-STATE outputs, designed for low-voltage (2.7–3.6 V) bus interface applications while maintaining 5 V TTL compatibility. It delivers ±32 mA / +64 mA drive capability, supports live insertion/extraction, and features power-up/down high-impedance behavior to prevent bus glitches. Used in memory address drivers and clock distribution systems on dense PCBs.

For engineers reviewing the 74LVT240MSAX datasheet, pinout, applications, or equivalent options, key selection criteria include 3.3 V operation with 5 V input tolerance, bushold-free input architecture, 20-pin SSOP package, and guaranteed 4.6 ns max propagation delay at 3.3 V.

Technical Context

The 74LVT240MSAX implements eight independent inverting buffers, each with dual 3-STATE enable inputs (OE1/OE2) controlling two groups of four outputs. Its BiCMOS process enables ABT-class speed (≤4.6 ns tPLH/tPHL) while maintaining low ICCZ (0.19 mA) in disabled state.

It operates across –40°C to +85°C with VCC = 2.7–3.6 V, accepts VI up to 5.5 V, and guarantees output drive of –32 mA (IOH) and +64 mA (IOL). Input clamp voltage is –1.2 V, and dynamic VOLP/VOLV are specified at ±0.8 V under switching conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	2.7 V to 3.6 V - Ensures stable operation in 3.3 V systems with ±10% supply tolerance.
IOH / IOL	–32 mA / +64 mA - Supports driving heavy capacitive loads or multiple TTL inputs without external buffers.
tPLH / tPHL	Max 4.6 ns at VCC = 2.7 V, CL = 50 pF - Enables high-speed bus buffering in memory and clock paths.
VIH / VIL	2.0 V / 0.8 V - Compatible with 5 V TTL logic levels while powered from 3.3 V supply.
ICCZ	0.19 mA - Minimizes standby current when outputs are disabled, critical for low-power system states.
CIN / COUT	3 pF / 6 pF - Low input/output capacitance reduces signal distortion and improves timing margin.
ESD Rating	HBM > 2000 V - Provides robust handling during board assembly and field service.

Pinout & Package

74LVT240MSAX is housed in a 20-lead Shrink Small Outline Package (SSOP), JEDEC MO-150, 5.3 mm wide, with 0.65 mm lead pitch and gull-wing terminations. The package is lead-free per JEDEC J-STD-020B.

Pin	Circuit Role	Design Meaning
1, 19	OE1, OE2	Active-low 3-STATE enable inputs controlling outputs O0–O3 (OE1) and O4–O7 (OE2); both must be LOW to enable respective group.
2–9	I0–I7	Inverting data inputs; each drives corresponding output with polarity inversion (e.g., I0 → O0 = NOT I0).
11–18	O0–O7	3-STATE inverting outputs; present inverted input signal when enabled, enter high-impedance when OE1/OE2 HIGH.
10, 20	GND, VCC	Power supply pins - dual ground and single VCC connection ensure stable biasing and noise immunity.

Key Features

Feature	Design Value
5 V tolerant inputs	Accepts VI up to 5.5 V while operating at 3.3 V VCC - eliminates level shifters in mixed-voltage systems.
Live insertion/extraction support	Enables hot-swap capability in backplane and modular systems without damaging the device or bus.
Power-up/down high-impedance	Outputs remain in 3-STATE during power transitions - prevents bus contention and data corruption.
Latch-up immunity	Exceeds 500 mA - ensures robustness against transient overcurrent events in industrial environments.
No bushold circuitry	Differentiates 74LVT240MSAX from LVTH variants - requires external pull-ups on unused inputs for defined logic state.

Applications

Memory Address Buffering	Clock Distribution
Use Scenario: Driving address lines from a 3.3 V microcontroller to multiple 5 V SRAM chips on a shared bus. IC Role / Device Role / Timing Role: Inverting octal buffer providing level translation, fanout expansion, and bus isolation. Use Value: Eliminates need for discrete level shifters while delivering 64 mA sink current to meet SRAM input requirements.	Use Scenario: Distributing a system clock signal to multiple 3.3 V peripherals with matched skew and low jitter. IC Role / Device Role / Timing Role: Low-skew (<1.0 ns) inverting line driver ensuring synchronized clock arrival across endpoints. Use Value: Output-to-output skew ≤1.0 ns maintains timing integrity in synchronous digital subsystems.
PCI Bus Interface	Industrial Control Backplane
Use Scenario: Interfacing a 3.3 V PCI controller to legacy 5 V peripheral cards via address/data multiplexing. IC Role / Device Role / Timing Role: Bidirectional bus transceiver buffer with 3-STATE control enabling time-multiplexed read/write cycles. Use Value: Guaranteed 4.6 ns max propagation delay meets PCI 2.2 setup/hold timing constraints at 33 MHz.	Use Scenario: Isolating PLC I/O module logic from noisy 24 V field-side signals using optocoupler-driven buses. IC Role / Device Role / Timing Role: Robust 3-STATE buffer decoupling field-side transceivers from controller-side logic. Use Value: HBM ESD >2000 V and latch-up immunity >500 mA withstand industrial surge and EMI exposure.

Memory Address Buffering

Clock Distribution

Use Scenario: Driving address lines from a 3.3 V microcontroller to multiple 5 V SRAM chips on a shared bus.

IC Role / Device Role / Timing Role: Inverting octal buffer providing level translation, fanout expansion, and bus isolation.

Use Value: Eliminates need for discrete level shifters while delivering 64 mA sink current to meet SRAM input requirements.

Use Scenario: Distributing a system clock signal to multiple 3.3 V peripherals with matched skew and low jitter.

IC Role / Device Role / Timing Role: Low-skew (<1.0 ns) inverting line driver ensuring synchronized clock arrival across endpoints.

Use Value: Output-to-output skew ≤1.0 ns maintains timing integrity in synchronous digital subsystems.

PCI Bus Interface

Industrial Control Backplane

Use Scenario: Interfacing a 3.3 V PCI controller to legacy 5 V peripheral cards via address/data multiplexing.

IC Role / Device Role / Timing Role: Bidirectional bus transceiver buffer with 3-STATE control enabling time-multiplexed read/write cycles.

Use Value: Guaranteed 4.6 ns max propagation delay meets PCI 2.2 setup/hold timing constraints at 33 MHz.

Use Scenario: Isolating PLC I/O module logic from noisy 24 V field-side signals using optocoupler-driven buses.

IC Role / Device Role / Timing Role: Robust 3-STATE buffer decoupling field-side transceivers from controller-side logic.

Use Value: HBM ESD >2000 V and latch-up immunity >500 mA withstand industrial surge and EMI exposure.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVTH240MSA	Includes bushold inputs; eliminates need for external pull-ups on unused inputs.	Better suited for systems with floating or intermittently driven inputs where logic state retention is critical.	Select 74LVTH240MSA if input stability without external components is required; otherwise 74LVT240MSAX offers lower cost and same core functionality.
SN74LVC240APWR	Non-inverting outputs; CMOS-based; slightly higher ICCZ (10 µA vs 0.19 mA) but lower IOL (24 mA vs 64 mA).	Preferred in 3.3 V-only systems requiring non-inverting logic and lower static power; not suitable for 5 V-tolerant interfaces.	Choose SN74LVC240APWR only for pure 3.3 V designs without 5 V input exposure; 74LVT240MSAX remains optimal for mixed-voltage bus interfacing.

Compared with 74LVTH240MSA and SN74LVC240APWR, the 74LVT240MSAX uniquely balances 5 V input tolerance, high drive strength (+64 mA), and inverting logic in a compact SSOP package-making it the preferred choice for legacy-compatible 3.3 V bus drivers where bushold is unnecessary.

Availability

74LVT240MSAX is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, PCI interface, and industrial control backplane applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for 74LVT240MSAX 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 designer and manufacturer of high-performance analog and mixed-signal semiconductors, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.

The 74LVT240MSAX belongs to Fairchild's LVT (Low-Voltage TTL) logic family, engineered for 3.3 V systems needing backward compatibility with 5 V TTL signaling, high-speed bus driving, and robust operation in mixed-voltage environments.

FAQ

What is the function of the OE1 and OE2 pins on the 74LVT240MSAX?

The OE1 and OE2 pins on the 74LVT240MSAX are active-low 3-STATE output enable inputs. OE1 controls outputs O0–O3, and OE2 controls O4–O7. When either is HIGH, its associated group enters high-impedance state; both must be LOW to enable their respective outputs. This allows independent bus segment control without external logic.

Does the 74LVT240MSAX support 5 V logic inputs while operating at 3.3 V VCC?

Yes, the 74LVT240MSAX supports 5 V-tolerant inputs: VI can range from 0 V to 5.5 V while VCC is 2.7–3.6 V. This enables direct interfacing with 5 V TTL devices without level-shifting circuitry, preserving signal integrity and reducing BOM count in mixed-voltage systems.

What is the maximum output drive capability of the 74LVT240MSAX?

The 74LVT240MSAX provides –32 mA source current (IOH) and +64 mA sink current (IOL) per output at VCC = 3.0 V. This high drive strength allows direct connection to multiple TTL inputs or moderate capacitive loads (e.g., >50 pF), eliminating need for additional buffer stages in bus-driving applications.

Is the 74LVT240MSAX pin-compatible with standard 74-series 240 devices?

The 74LVT240MSAX is functionally compatible with the 74 series 240 but not pin-compatible with through-hole DIP versions due to its 20-pin SSOP package. Pin assignments match industry-standard 20-lead logic buffer layouts (e.g., OE, I0–I7, O0–O7, VCC, GND), enabling drop-in replacement in SSOP-footprinted designs originally using 74LVT240 variants.

What package type is used for the 74LVT240MSAX, and what are its key mechanical features?

The 74LVT240MSAX uses a 20-lead Shrink Small Outline Package (SSOP), JEDEC MO-150, 5.3 mm wide, with 0.65 mm lead pitch and gull-wing leads. It is lead-free per JEDEC J-STD-020B, has a body size of 7.60 × 5.30 mm, and supports reflow soldering with standard profile compatibility for high-volume SMT assembly.

74LVT240MSAX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LVT

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

Packaging:: Tape & Reel (TR)

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-SSOP

74LVT240MSAX FAQ

1.How can I place an order for 74LVT240MSAX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LVT240MSAX 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 74LVT240MSAX reliable?

The price and inventory of 74LVT240MSAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT240MSAX is usually 5 days.

3.What payment methods are accepted for 74LVT240MSAX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT240MSAX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LVT240MSAX?

74LVT240MSAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LVT240MSAX 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 74LVT240MSAX?

For technical support, including 74LVT240MSAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT240MSAX requirements.

6.How does Aetrix verify that 74LVT240MSAX is sourced from the original manufacturer or authorized distributors?

All 74LVT240MSAX 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 74LVT240MSAX meets industry standards.

7.What is the process for return or replacement of 74LVT240MSAX?

All 74LVT240MSAX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT240MSAX, 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 74LVT240MSAX part is unused and in its original packaging.

Return procedure for 74LVT240MSAX:

1.Submit a request within 90 days.

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

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