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

Toshiba Semiconductor and Storage 74LCX240FT(AE)

Name: 74LCX240FT(AE)
Brand: Toshiba Semiconductor and Storage
SKU: 74LCX240FT(AE)
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LCX240FT(AE)

Manufacturer:: Toshiba Semiconductor and Storage

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74LCX240FT(AE).pdf

Description:: IC BUFFER INVERT 3.6V 20TSSOP

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Product details

Overview

74LCX240FT(AE) from Toshiba is a low-voltage, inverting octal 3-state bus buffer IC designed for 3.3 V system interfacing with 5 V tolerant inputs and outputs. It delivers 6.5 ns max propagation delay at 3.3 V, supports ±24 mA output drive, operates across 1.65–3.6 V supply range, and features dual active-low output enables. It is used in memory address driver circuits requiring level translation and bus isolation.

For engineers reviewing the 74LCX240FT(AE) datasheet, 74LCX240FT(AE) pinout, 74LCX240FT(AE) application, or 74LCX240FT(AE) equivalent, key selection criteria include 5 V tolerance on all I/Os, guaranteed t_PZH/t_PZL ≤ 8.0 ns at 3.3 V, TSSOP20B package compatibility, and functional equivalence to 74LVC240 while supporting wider V_CC range.

Technical Context

The 74LCX240FT(AE) implements an inverting 3-state logic architecture with two independent active-low output enable (OE) controls-one per 4-bit group-enabling selective bus gating. Its input protection diodes and power-down leakage control support hot-swap and partial-power-down operation without latch-up risk.

All eight buffers share identical DC and AC characteristics: VIH/VIL thresholds scale with V_CC, VOL ≤ 0.4 V at I_OL = 24 mA (V_CC = 3.0 V), and dynamic noise margins are validated via VOLP/VOLV measurements at 3.3 V with 50 pF load.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65 V to 3.6 V - Enables direct integration into 2.5 V and 3.3 V logic domains without level shifters.
t_PHL/t_PLH (max)	6.5 ns at V_CC = 3.3 V - Supports >100 MHz bus clocking in memory address/data paths.
I_OH/I_OL	±24 mA min at V_CC = 3.0 V - Drives 50 Ω transmission lines or multiple LVC/LCX loads without external buffers.
Input/Output Voltage Tolerance	−0.5 V to 6.5 V - Allows safe connection to 5 V buses without external clamping or resistors.
3-State Enable/Disable Time	t_PZH/t_PZL ≤ 8.0 ns, t_PHZ/t_PLZ ≤ 7.0 ns at 3.3 V - Minimizes bus contention during multiplexer switching.
Power Dissipation Capacitance	C_PD = 25 pF - Predicts ICC(opr) = 25 pF × V_CC × f_IN + ICC/8 for dynamic current estimation.

Pinout & Package

TSSOP20B (Thin Shrink Small Outline Package, 20-pin, 0.65 mm pitch, 6.5 mm × 4.4 mm footprint, 0.071 g typical weight).

Pin/Terminal	Circuit Role	Design Meaning
1, 19	OE1, OE2 (active-low)	Independent 4-bit group enables: OE1 controls Y0–Y3, OE2 controls Y4–Y7; both must be low for output drive.
2–5, 13–16	A0–A3, A4–A7 (inputs)	Inverting data inputs; 5 V tolerant, ESD-protected, compatible with TTL/CMOS logic thresholds.
6–9, 11–14	Y0–Y3, Y4–Y7 (outputs)	Inverted, 3-state outputs; high-impedance when respective OE is high; ±24 mA sink/source capable.
10	GND	Ground reference for all I/O and internal circuitry; decoupling capacitor required adjacent to pin.
20	V_CC	Primary supply (1.65–3.6 V); must be bypassed with 0.1 µF ceramic capacitor near pin.

Key Features

Feature	Design Value
5 V tolerant I/O	Guaranteed operation with VIN/VOUT up to 6.5 V - eliminates external voltage translators in mixed-supply systems.
Low dynamic noise	VOLP = 0.8 V (typ.) at 3.3 V - reduces ground bounce and crosstalk in dense PCB layouts.
Power-off protection	IOFF ≤ ±10 µA at V_IN/V_OUT = 5.5 V, V_CC = 0 V - prevents backfeeding and signal corruption during power sequencing.
Pin/function compatibility	Direct drop-in replacement for 74LVC240 and 74ALVC240 - no PCB or firmware changes required.
Wide temperature range	−40 °C to +85 °C operating range - qualified for industrial-grade embedded control and communications equipment.

Applications

Memory Address Buffering	Level Translation Interface
Use Scenario: Driving 32-bit address bus between 3.3 V microcontroller and 5 V SRAM/Flash memory. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing bidirectional voltage translation and bus contention avoidance. Use Value: Eliminates need for discrete level shifters while maintaining <6.5 ns propagation delay and ±24 mA drive strength.	Use Scenario: Interfacing 3.3 V FPGA I/O banks to legacy 5 V peripheral controllers. IC Role / Device Role / Timing Role: Unidirectional voltage-tolerant buffer isolating FPGA pins from overvoltage stress during power-up/down sequences. Use Value: Prevents damage from 5 V signals applied before V_CC is stable, with IOFF leakage <10 µA at zero supply.
Industrial Bus Isolation	Test Equipment Signal Conditioning
Use Scenario: Isolating CAN or RS-485 transceiver control lines from 3.3 V host MCU in noisy factory environments. IC Role / Device Role / Timing Role: Noise-immune 3-state gate enabling/disabling transceiver drivers without signal glitches. Use Value: t_PZL ≤ 8.0 ns ensures clean enable/disable transitions, minimizing bus arbitration errors.	Use Scenario: Conditioning digital stimulus signals in automated test equipment (ATE) with mixed-voltage DUT interfaces. IC Role / Device Role / Timing Role: Precision timing buffer adding deterministic delay and drive capability to pattern generators. Use Value: Matched t_PLH/t_PHL skew ≤1.0 ns ensures sub-nanosecond channel-to-channel alignment.

Memory Address Buffering

Level Translation Interface

Use Scenario: Driving 32-bit address bus between 3.3 V microcontroller and 5 V SRAM/Flash memory.

IC Role / Device Role / Timing Role: Inverting 3-state buffer providing bidirectional voltage translation and bus contention avoidance.

Use Value: Eliminates need for discrete level shifters while maintaining <6.5 ns propagation delay and ±24 mA drive strength.

Use Scenario: Interfacing 3.3 V FPGA I/O banks to legacy 5 V peripheral controllers.

IC Role / Device Role / Timing Role: Unidirectional voltage-tolerant buffer isolating FPGA pins from overvoltage stress during power-up/down sequences.

Use Value: Prevents damage from 5 V signals applied before V_CC is stable, with IOFF leakage <10 µA at zero supply.

Industrial Bus Isolation

Test Equipment Signal Conditioning

Use Scenario: Isolating CAN or RS-485 transceiver control lines from 3.3 V host MCU in noisy factory environments.

IC Role / Device Role / Timing Role: Noise-immune 3-state gate enabling/disabling transceiver drivers without signal glitches.

Use Value: t_PZL ≤ 8.0 ns ensures clean enable/disable transitions, minimizing bus arbitration errors.

Use Scenario: Conditioning digital stimulus signals in automated test equipment (ATE) with mixed-voltage DUT interfaces.

IC Role / Device Role / Timing Role: Precision timing buffer adding deterministic delay and drive capability to pattern generators.

Use Value: Matched t_PLH/t_PHL skew ≤1.0 ns ensures sub-nanosecond channel-to-channel alignment.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVC240PW,118	Same TSSOP20 package; V_CC range narrower (1.65–3.3 V); t_PHL = 7.5 ns (max) at 3.3 V.	Limited to strict 3.3 V systems; not rated for 3.6 V operation or 5 V tolerant I/O beyond 3.3 V.	Select when cost sensitivity outweighs need for 3.6 V margin or 5 V bus robustness.
SN74LVC240APWR	TI part in TSSOP20; identical V_CC and I/O tolerance specs; t_PHL = 6.7 ns (max) at 3.3 V.	Same functional behavior but different qualification standards (AEC-Q100 not claimed); RoHS/REACH documentation differs.	Prefer for TI-aligned BOMs or where dual-sourcing across vendors is required without layout change.

Compared with 74LVC240PW,118 and SN74LVC240APWR, the 74LCX240FT(AE) offers broader V_CC headroom (up to 3.6 V), tighter propagation delay (6.5 ns vs. ≥6.7 ns), and explicit 5 V tolerance validation across full operating temperature range - critical for industrial power supply variation and long-term reliability.

Availability

74LCX240FT(AE) is available at Aetrix Electronics and suitable for memory subsystem design, industrial bus interface, FPGA I/O expansion, and automated test equipment requiring stable component supply and long-lifecycle support.

Supply support for 74LCX240FT(AE) 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

Toshiba Electronic Devices & Storage Corporation designs and manufactures high-reliability semiconductor components for industrial, automotive, and computing applications, with emphasis on logic, power, and memory solutions.

The 74LCX family targets low-voltage, high-speed CMOS logic interoperability across mixed-supply systems, specifically addressing voltage translation, bus buffering, and noise-immune signal routing in space-constrained industrial electronics.

FAQ

What is the maximum supply voltage rating for the 74LCX240FT(AE)?

The 74LCX240FT(AE) has an absolute maximum V_CC rating of 6.5 V, but its recommended operating range is 1.65 V to 3.6 V. Operation above 3.6 V voids parametric guarantees including propagation delay, output drive, and power dissipation. The 74LCX240FT(AE) maintains full functionality and reliability only within the 1.65–3.6 V window specified in the Toshiba datasheet Rev. 3.0.A.

Does the 74LCX240FT(AE) support true 5 V tolerant operation on inputs and outputs?

Yes, the 74LCX240FT(AE) supports true 5 V tolerance: inputs and outputs are rated for −0.5 V to 6.5 V regardless of V_CC state, verified under Absolute Maximum Ratings and Operating Ranges sections. This allows direct connection to 5 V buses without external clamping, even when V_CC = 0 V - a feature confirmed by IOFF ≤ ±10 µA measurement at V_IN/V_OUT = 5.5 V.

What is the guaranteed propagation delay for the 74LCX240FT(AE) at 3.3 V?

The 74LCX240FT(AE) guarantees t_PLH/t_PHL ≤ 6.5 ns (max) at V_CC = 3.3 ± 0.3 V and T_A = −40 to +85 °C, per AC Characteristics Table 11.2. This value is measured under defined load conditions (C_L = 50 pF, R_L = 500 Ω) and reflects worst-case performance across process, voltage, and temperature corners.

How does the 74LCX240FT(AE) handle power-down scenarios?

The 74LCX240FT(AE) provides power-down protection via IOFF circuitry that limits input/output leakage to ±10 µA when V_CC = 0 V and V_IN/V_OUT = 5.5 V. This prevents back-driving powered-down systems and ensures signal integrity during hot-swap or asymmetric power sequencing - a design feature explicitly documented in Section 3 (Features) and Table 9 (Absolute Maximum Ratings).

Is the 74LCX240FT(AE) pin-compatible with standard 74-series octal buffers?

Yes, the 74LCX240FT(AE) is pin- and function-compatible with industry-standard 74LVC240 and 74ALVC240 devices in TSSOP20 packages. Pin assignments match the JEDEC MS-013AC outline, and truth table behavior (including dual active-low OE control and inverting 3-state outputs) is identical - confirmed in Sections 5 (Pin Assignment) and 8 (Truth Table) of the Toshiba datasheet.

74LCX240FT(AE) Specifications

Product attributes: Attribute value

Manufacturer:: Toshiba Semiconductor and Storage

Series:: 74LCX

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Logic Type:: Buffer, Inverting

Number of Elements:: 2

Number of Bits per Element:: 4

Input Type:: -

Output Type:: 3-State

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

Voltage - Supply:: 1.65V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-TSSOP

74LCX240FT(AE) FAQ

1.How can I place an order for 74LCX240FT(AE) through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LCX240FT(AE) 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 74LCX240FT(AE) reliable?

The price and inventory of 74LCX240FT(AE) are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX240FT(AE) is usually 5 days.

3.What payment methods are accepted for 74LCX240FT(AE)?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX240FT(AE) transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LCX240FT(AE)?

74LCX240FT(AE) orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LCX240FT(AE) 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 74LCX240FT(AE)?

For technical support, including 74LCX240FT(AE) datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX240FT(AE) requirements.

6.How does Aetrix verify that 74LCX240FT(AE) is sourced from the original manufacturer or authorized distributors?

All 74LCX240FT(AE) 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 74LCX240FT(AE) meets industry standards.

7.What is the process for return or replacement of 74LCX240FT(AE)?

All 74LCX240FT(AE) units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX240FT(AE), 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 74LCX240FT(AE) part is unused and in its original packaging.

Return procedure for 74LCX240FT(AE):

1.Submit a request within 90 days.

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

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