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Toshiba Semiconductor and Storage TC74LCX540FT(EL,M)

Name: TC74LCX540FT(EL,M)
Brand: Toshiba Semiconductor and Storage
SKU: TC74LCX540FT(EL,M)
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TC74LCX540FT(EL,M)

Manufacturer:: Toshiba Semiconductor and Storage

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: TC74LCX540FT(EL,M).pdf

Description:: IC BUFFER INVERT 3.6V 20TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:1,422

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Product details

Overview

TC74LCX540FT(EL,M) from Toshiba Electronic Devices & Storage Corporation is an inverting 3-state octal bus buffer designed for 3.3-V logic systems with 5-V tolerant inputs and outputs. It delivers 6.5 ns max propagation delay at VCC = 3.3 V, ±24 mA output drive, and operates across 1.65–3.6 V supply range - enabling robust level-shifting between 3.3-V controllers and legacy 5-V peripherals in memory address/data bus interfaces.

For engineers reviewing the TC74LCX540FT(EL,M) datasheet, TC74LCX540FT(EL,M) pinout, TC74LCX540FT(EL,M) application, or TC74LCX540FT(EL,M) equivalent, key selection criteria include its dual active-low output enables (1OE, 2OE), high-impedance state control, JEITA SOP-20 package compatibility, and verified 5-V tolerance on all I/O pins without external clamping.

Technical Context

The TC74LCX540FT(EL,M) implements a dual-enable inverting buffer architecture: both 1OE and 2OE must be low to enable inverted outputs; either high forces all eight outputs into high-impedance state. Its CMOS design supports rail-to-rail input voltage range (0–5.5 V) while maintaining valid logic thresholds across VCC = 1.65–3.6 V.

It features power-down protection on all I/O terminals, static discharge protection on every input, and guaranteed AC timing (tpLH/tpHL ≤ 6.5 ns, tpZL/tpZH ≤ 8.5 ns at 3.3 V) under industrial temperature (−40°C to +85°C). The device is not a bus transceiver - it provides unidirectional, non-inverting input-to-inverted-output signal flow only.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	1.65 V to 3.6 V - enables operation in modern low-voltage systems while retaining backward compatibility with 3.3-V infrastructure
Propagation Delay	6.5 ns max (tpLH/tpHL at VCC = 3.3 V) - ensures timing compliance in high-speed address/data buffering up to ~100 MHz clock domains
Output Drive	±24 mA (IOL/IOH at VCC = 3.0 V) - drives standard TTL loads and multiple CMOS inputs without external buffers
I/O Voltage Tolerance	0–5.5 V on all inputs and outputs - allows direct interfacing to 5-V buses without level-shifters or resistive dividers
Operating Temperature	−40°C to +85°C - qualified for industrial-grade embedded control and communications equipment
Quiescent ICC	≤10 µA - minimizes standby power in battery-backed or energy-sensitive applications
Input Capacitance	7 pF (typ. at 3.3 V) - reduces capacitive loading on upstream drivers and preserves signal integrity in dense PCB layouts

Pinout & Package

TC74LCX540FT(EL,M) is packaged in JEITA-standard SOP-20 (Small Outline Package, 20-pin, 1.27 mm pitch), designated SOP20-P-300-1.27A per Toshiba documentation, with typical weight of 0.22 g.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	1OE, 2OE	Active-low output enable controls - either high disables all outputs; both low enables inverted A1–A8 → Y1–Y8 path
2–9, 11–18	A1–A8, Y1–Y8	Inverting data path: A1→Y1, A2→Y2, ..., A8→Y8 - each pair provides true inversion with 3-state capability
10	GND	Ground reference for logic and power return - must be low-impedance connection to system ground plane
20	VCC	Primary power supply (1.65–3.6 V) - requires local 100 nF ceramic decoupling adjacent to pin

Key Features

Feature	Design Value
5-V tolerant I/O	Valid DC input/output voltage range up to 5.5 V - eliminates need for external voltage translators when interfacing with 5-V peripherals
Dual independent output enables	1OE and 2OE allow partitioned bus control - e.g., enable Y1–Y4 and Y5–Y8 separately for segmented memory addressing
Low-power CMOS design	ICC ≤ 10 µA quiescent current - reduces system-level power budget in always-on or sleep-mode subsystems
ESD-protected inputs	All inputs include integrated static discharge protection - meets >2 kV HBM without external TVS components
PIN- and FUNCTION-compatible with 74-series	Direct drop-in replacement for 74AC540, 74HC540, 74LS540 in SOP-20 footprint - simplifies legacy design upgrades

Applications

Memory Address Buffering	Industrial PLC I/O Expansion
Use Scenario: Driving 32-bit address lines from a 3.3-V microcontroller to multiple 5-V SRAM chips in a programmable logic controller. IC Role / Device Role / Timing Role: Inverting 3-state octal buffer providing level translation, fanout amplification, and bus isolation during DMA cycles. Use Value: Eliminates discrete level shifters and reduces BOM count by leveraging native 5-V I/O tolerance and 24-mA drive strength.	Use Scenario: Isolating field I/O signals (e.g., 24-V digital inputs) via optocouplers before routing to a 3.3-V FPGA-based control core. IC Role / Device Role / Timing Role: Bidirectional-capable buffer (used unidirectionally) conditioning and buffering opto-isolated signals into FPGA GPIO banks. Use Value: Ensures noise-immune signal transfer with guaranteed 6.5 ns propagation delay and −40°C to +85°C operation.
Legacy Peripheral Interface	Test Equipment Signal Conditioning
Use Scenario: Interfacing a modern ARM Cortex-M4 MCU (3.3-V I/O) to legacy ISA-bus peripherals operating at 5-V logic levels. IC Role / Device Role / Timing Role: Level-translating octal buffer enabling safe, high-speed communication without violating voltage domain boundaries. Use Value: Achieves full 5-V tolerance on all pins - no external clamping diodes or series resistors required.	Use Scenario: Routing calibrated digital stimulus patterns from a 3.3-V pattern generator to DUT inputs requiring precise 5-V logic thresholds. IC Role / Device Role / Timing Role: Precision timing buffer ensuring sub-10 ns edge fidelity and minimal skew (<1.0 ns) across all eight channels. Use Value: Delivers matched propagation delays and low output skew - critical for synchronized multi-channel test vector delivery.

Memory Address Buffering

Industrial PLC I/O Expansion

Use Scenario: Driving 32-bit address lines from a 3.3-V microcontroller to multiple 5-V SRAM chips in a programmable logic controller.

IC Role / Device Role / Timing Role: Inverting 3-state octal buffer providing level translation, fanout amplification, and bus isolation during DMA cycles.

Use Value: Eliminates discrete level shifters and reduces BOM count by leveraging native 5-V I/O tolerance and 24-mA drive strength.

Use Scenario: Isolating field I/O signals (e.g., 24-V digital inputs) via optocouplers before routing to a 3.3-V FPGA-based control core.

IC Role / Device Role / Timing Role: Bidirectional-capable buffer (used unidirectionally) conditioning and buffering opto-isolated signals into FPGA GPIO banks.

Use Value: Ensures noise-immune signal transfer with guaranteed 6.5 ns propagation delay and −40°C to +85°C operation.

Legacy Peripheral Interface

Test Equipment Signal Conditioning

Use Scenario: Interfacing a modern ARM Cortex-M4 MCU (3.3-V I/O) to legacy ISA-bus peripherals operating at 5-V logic levels.

IC Role / Device Role / Timing Role: Level-translating octal buffer enabling safe, high-speed communication without violating voltage domain boundaries.

Use Value: Achieves full 5-V tolerance on all pins - no external clamping diodes or series resistors required.

Use Scenario: Routing calibrated digital stimulus patterns from a 3.3-V pattern generator to DUT inputs requiring precise 5-V logic thresholds.

IC Role / Device Role / Timing Role: Precision timing buffer ensuring sub-10 ns edge fidelity and minimal skew (<1.0 ns) across all eight channels.

Use Value: Delivers matched propagation delays and low output skew - critical for synchronized multi-channel test vector delivery.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVC541APW,118	Non-inverting output polarity; identical VCC range (1.65–3.6 V), 5-V tolerant I/O, and SOP-20 package	Requires logic inversion upstream/downstream if system relies on inverting behavior of TC74LCX540FT(EL,M)	Select when non-inverting function matches system architecture and pinout compatibility is prioritized over polarity
SN74LVTH540PW	Higher drive (±32 mA), but only 3.3-V I/O tolerance (not 5-V tolerant); requires external level shifting for 5-V interfaces	Not suitable for direct 5-V bus interfacing - adds complexity in mixed-voltage designs where TC74LCX540FT(EL,M) excels	Choose only in pure 3.3-V environments demanding higher sink/source current and faster 5.5 ns tpd

Compared with 74LVC541APW,118 and SN74LVTH540PW, the TC74LCX540FT(EL,M) uniquely combines true inverting logic, native 5-V I/O tolerance, and industrial temperature rating - making it the optimal choice for legacy-system integration where polarity and voltage-domain bridging are co-constrained.

Availability

TC74LCX540FT(EL,M) is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and legacy peripheral interface applications requiring stable component supply, long-lifecycle support, and guaranteed 5-V tolerant operation.

Supply support for TC74LCX540FT(EL,M) 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 is a global semiconductor manufacturer specializing in power devices, logic ICs, and storage solutions, with decades of expertise in high-reliability CMOS design.

The TC74LCX540FT(EL,M) belongs to Toshiba's LCX low-voltage logic family, engineered specifically for seamless voltage-domain bridging between emerging 3.3-V systems and installed 5-V infrastructure in industrial and communications equipment.

FAQ

What is the maximum supply voltage for TC74LCX540FT(EL,M)?

The absolute maximum VCC rating for TC74LCX540FT(EL,M) is 7.0 V, but the recommended operating range is strictly 1.65 V to 3.6 V. Operating outside this range risks parametric degradation or permanent damage. The device maintains full functionality-including 5-V I/O tolerance-only within the specified 1.65–3.6 V VCC window, as confirmed in Toshiba's official Electrical Characteristics table.

Does TC74LCX540FT(EL,M) support true 5-V logic level inputs and outputs?

Yes, TC74LCX540FT(EL,M) supports DC input and output voltages from 0 V to 5.5 V regardless of VCC setting (within 1.65–3.6 V), satisfying full 5-V TTL compatibility. This is explicitly documented in the Absolute Maximum Ratings and Operating Ranges tables, where VIN and VOUT are rated to 5.5 V - enabling direct connection to 5-V buses without external components.

What is the function of pins 1 and 19 on TC74LCX540FT(EL,M)?

Pins 1 and 19 are 1OE and 2OE - active-low output enable terminals. When either is high, all eight Y outputs enter high-impedance state; only when both are low do the inverted A1–A8 signals appear at Y1–Y8. This dual-enable architecture allows flexible bus segmentation and avoids bus contention in multi-driver systems - a key feature confirmed in the Truth Table and Pin Assignment diagrams.

Is TC74LCX540FT(EL,M) pin-compatible with standard 74-series octal buffers?

Yes, TC74LCX540FT(EL,M) is pin- and function-compatible with 74AC540, 74HC540, and 74LS540 in SOP-20 packages, as stated in Toshiba's Features section. Its pinout matches the industry-standard 540-type layout, including identical VCC (pin 20), GND (pin 10), and I/O assignments - enabling drop-in replacement without PCB modification.

What is the propagation delay specification for TC74LCX540FT(EL,M) at 3.3 V?

At VCC = 3.3 V ± 0.3 V, the maximum propagation delay (tpLH and tpHL) for TC74LCX540FT(EL,M) is 6.5 ns, measured under defined AC test conditions (CL = 50 pF, RL = 500 Ω). This value is guaranteed across the full industrial temperature range (−40°C to +85°C) and appears in Toshiba's AC Characteristics table on page 5 of the official datasheet.

TC74LCX540FT(EL,M) 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:: 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:: 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

TC74LCX540FT(EL,M) FAQ

1.How can I place an order for TC74LCX540FT(EL,M) through Aetrix?

Please submit a Request for Quotation (RFQ) for TC74LCX540FT(EL,M) 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 TC74LCX540FT(EL,M) reliable?

The price and inventory of TC74LCX540FT(EL,M) are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC74LCX540FT(EL,M) is usually 5 days.

3.What payment methods are accepted for TC74LCX540FT(EL,M)?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC74LCX540FT(EL,M) transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TC74LCX540FT(EL,M)?

TC74LCX540FT(EL,M) orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TC74LCX540FT(EL,M) 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 TC74LCX540FT(EL,M)?

For technical support, including TC74LCX540FT(EL,M) datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC74LCX540FT(EL,M) requirements.

6.How does Aetrix verify that TC74LCX540FT(EL,M) is sourced from the original manufacturer or authorized distributors?

All TC74LCX540FT(EL,M) 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 TC74LCX540FT(EL,M) meets industry standards.

7.What is the process for return or replacement of TC74LCX540FT(EL,M)?

All TC74LCX540FT(EL,M) units undergo pre-shipment inspection (PSI). If there is an issue with TC74LCX540FT(EL,M), 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 TC74LCX540FT(EL,M) part is unused and in its original packaging.

Return procedure for TC74LCX540FT(EL,M):

1.Submit a request within 90 days.

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

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