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Toshiba Semiconductor and Storage TC74LCX540FK(EL,K)

Name: TC74LCX540FK(EL,K)
Brand: Toshiba Semiconductor and Storage
SKU: TC74LCX540FK(EL,K)
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TC74LCX540FK(EL,K)

Manufacturer:: Toshiba Semiconductor and Storage

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-VFSOP (0.118", 3.00mm Width)

Datasheet:: TC74LCX540FK(EL,K).pdf

Description:: IC BUFFER INVERT 3.6V 20VSSOP

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Product details

Overview

TC74LCX540FK(EL,K) 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 level translation between 3.3-V controllers and legacy 5-V peripherals in memory address/data bus interfaces.

For engineers reviewing the TC74LCX540FK(EL,K) datasheet, TC74LCX540FK(EL,K) pinout, TC74LCX540FK(EL,K) application, or TC74LCX540FK(EL,K) equivalent, key selection criteria include its dual active-low output enables, high-impedance state control timing (tpZL/tpZH ≤ 8.5 ns), 5-V tolerance without external clamping, and JEDEC-standard SOP-20 pin compatibility with 74AC/VHC/HC 540-family logic.

Technical Context

The TC74LCX540FK(EL,K) implements a CMOS-based inverting buffer architecture with two independent active-low output enable inputs (1OE, 2OE), allowing selective tri-state control of two 4-bit groups (A1–A4 and A5–A8). Its input protection circuits support ESD robustness per IEC 61000-4-2, and power-down leakage is limited to ±10 µA when VCC = 0 V.

It operates within −40°C to +85°C ambient temperature and supports dynamic switching with CL = 50 pF, exhibiting typical input capacitance of 7 pF and output capacitance of 8 pF. The device's 5-V tolerance on all I/O pins is achieved via internal clamp diodes and optimized oxide thickness, eliminating need for external level-shifting components in mixed-voltage bus designs.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	1.65 V to 3.6 V - Enables operation in low-power 3.3-V systems while maintaining compatibility with 2.5-V and 1.8-V domains under derated conditions.
Propagation Delay	6.5 ns max (VCC = 3.3 V) - Supports ≥150 MHz bus toggle rates in address/data path applications with tight timing margins.
Output Drive	±24 mA (VCC = 3.0 V) - Drives standard TTL loads and multiple CMOS inputs without external buffers in fanout-critical bus environments.
I/O Voltage Tolerance	0 V to 5.5 V - Allows direct connection to 5-V buses without series resistors or voltage translators, reducing BOM count and layout complexity.
Quiescent ICC	≤10 µA - Minimizes standby power in battery-backed or energy-sensitive embedded systems where bus buffers remain powered but inactive.
Operating Temperature	−40°C to +85°C - Qualified for industrial-grade deployment in programmable logic controllers, motor drives, and factory automation equipment.

Pinout & Package

TC74LCX540FK(EL,K) is housed in a JEITA-standard SOP-20 (Small Outline Package, 20-pin, 300 mil body width, 1.27 mm pitch), designated as SOP20-P-300-1.27A per Toshiba documentation. This surface-mount package supports reflow soldering and offers mechanical stability for automated assembly in high-volume production.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	1OE, 2OE	Active-low output enable controls for A1–A4 and A5–A8 groups respectively; both must be low for functional output drive.
2–9	A1–A8	Inverting data inputs; each drives corresponding inverted output (Y1–Y8) when respective OE is asserted.
11–18	Y1–Y8	Inverted buffered outputs; enter high-impedance state when either OE is high, enabling shared bus arbitration.
10	GND	Ground reference for all internal circuitry and I/O; requires low-inductance connection to minimize noise coupling.
20	VCC	Primary power supply (1.65–3.6 V); decoupling capacitor (0.1 µF ceramic) required adjacent to pin for stable high-speed switching.

Key Features

Feature	Design Value
5-V tolerant I/O	Supports direct interfacing to 5-V legacy peripherals without external level shifters or clamping diodes-reducing component count and signal integrity risk.
Dual independent output enables	Enables partitioned bus control: A1–A4 and A5–A8 can be isolated independently, supporting segmented memory addressing or multi-master arbitration schemes.
Low dynamic power dissipation	CPD = 40 pF at 3.3 V enables <1 mW average power at 10 MHz toggle rate-critical for thermally constrained industrial modules.
ESD-protected inputs	Integrated protection circuits withstand ≥2 kV HBM per JESD22-A114-eliminating need for external TVS devices in non-harsh ESD environments.
JEDEC 74-series pin/function compatibility	Direct drop-in replacement for 74AC540, 74VHC540, and 74HC540 in existing PCB layouts, accelerating design reuse and qualification cycles.

Applications

Industrial PLC Backplane Interface	Embedded Microcontroller Address Bus Expansion
Use Scenario: Interfacing a 3.3-V ARM Cortex-M7 microcontroller to legacy 5-V SRAM and peripheral ICs on a modular PLC backplane. IC Role / Device Role / Timing Role: Inverting 3-state bus buffer providing level translation and bidirectional isolation between CPU and memory subsystems. Use Value: Eliminates discrete level shifters while maintaining 6.5 ns propagation delay-preserving timing margin for 16-bit address strobes operating up to 150 MHz.	Use Scenario: Expanding GPIO-driven address decoding in a low-cost IoT gateway using a 3.3-V RISC-V SoC with limited native address lines. IC Role / Device Role / Timing Role: Octal inverting buffer driving external flash and EEPROM chip-select signals with controlled slew and high-impedance disable. Use Value: Dual OE pins allow dynamic partitioning of address space; ±24 mA drive ensures reliable activation of multiple parallel memory devices.
Automotive Body Control Module (BCM)	Test Equipment Digital Pattern Generator
Use Scenario: Isolating diagnostic communication lines between a 3.3-V CAN controller and 5-V sensor interface ASICs in a Class A automotive BCM. IC Role / Device Role / Timing Role: Level-translating bus buffer with ESD-hardened I/O, used for non-critical control signal routing (e.g., LED driver enables, relay drivers). Use Value: −40°C to +85°C rating and 5-V tolerance meet AEC-Q100 Grade 3 requirements for cabin electronics without additional protection circuitry.	Use Scenario: Generating synchronized 8-bit test vectors in a benchtop digital pattern generator with selectable voltage domains (1.8 V/2.5 V/3.3 V/5 V). IC Role / Device Role / Timing Role: Precision-timing inverting buffer stage ensuring sub-10 ns edge alignment across all eight outputs during high-speed vector transitions. Use Value: Output skew ≤1.0 ns (VCC = 3.3 V) guarantees deterministic timing correlation between parallel test channels-critical for setup/hold validation.

Industrial PLC Backplane Interface

Embedded Microcontroller Address Bus Expansion

Use Scenario: Interfacing a 3.3-V ARM Cortex-M7 microcontroller to legacy 5-V SRAM and peripheral ICs on a modular PLC backplane.

IC Role / Device Role / Timing Role: Inverting 3-state bus buffer providing level translation and bidirectional isolation between CPU and memory subsystems.

Use Value: Eliminates discrete level shifters while maintaining 6.5 ns propagation delay-preserving timing margin for 16-bit address strobes operating up to 150 MHz.

Use Scenario: Expanding GPIO-driven address decoding in a low-cost IoT gateway using a 3.3-V RISC-V SoC with limited native address lines.

IC Role / Device Role / Timing Role: Octal inverting buffer driving external flash and EEPROM chip-select signals with controlled slew and high-impedance disable.

Use Value: Dual OE pins allow dynamic partitioning of address space; ±24 mA drive ensures reliable activation of multiple parallel memory devices.

Automotive Body Control Module (BCM)

Test Equipment Digital Pattern Generator

Use Scenario: Isolating diagnostic communication lines between a 3.3-V CAN controller and 5-V sensor interface ASICs in a Class A automotive BCM.

IC Role / Device Role / Timing Role: Level-translating bus buffer with ESD-hardened I/O, used for non-critical control signal routing (e.g., LED driver enables, relay drivers).

Use Value: −40°C to +85°C rating and 5-V tolerance meet AEC-Q100 Grade 3 requirements for cabin electronics without additional protection circuitry.

Use Scenario: Generating synchronized 8-bit test vectors in a benchtop digital pattern generator with selectable voltage domains (1.8 V/2.5 V/3.3 V/5 V).

IC Role / Device Role / Timing Role: Precision-timing inverting buffer stage ensuring sub-10 ns edge alignment across all eight outputs during high-speed vector transitions.

Use Value: Output skew ≤1.0 ns (VCC = 3.3 V) guarantees deterministic timing correlation between parallel test channels-critical for setup/hold validation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVC540APW,118	Lower VCC min (1.2 V), higher max tpd (7.5 ns @ 3.3 V), same SOP-20 footprint.	Optimized for ultra-low-voltage portable systems; less suitable for legacy 5-V bus interfacing due to 3.6-V absolute max I/O rating.	Select when system VCC may dip below 1.65 V or when tighter supply regulation is unavailable.
SN74LVCH16244ADGGR	16-bit non-inverting, dual 8-bit OE, 3.6-V max I/O, TSSOP-48 package.	Higher channel count and non-inverting logic; requires PCB redesign due to different pin count and pitch.	Select when expanding to 16-bit buses or requiring non-inverting polarity with enhanced drive (±24 mA at 3.3 V).

Compared with 74LVC540APW,118 and SN74LVCH16244ADGGR, the TC74LCX540FK(EL,K) uniquely combines guaranteed 5-V I/O tolerance, inverting logic, and JEDEC SOP-20 pinout-making it the only option among the three qualified for direct replacement in legacy 5-V bus upgrade paths without layout change.

Availability

TC74LCX540FK(EL,K) is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded microcontroller address expansion, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for TC74LCX540FK(EL,K) 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 core expertise in low-power CMOS process technologies and industrial reliability engineering.

The TC74LCX series targets low-voltage, high-speed logic interfacing in mixed-supply systems-designed specifically to bridge 3.3-V microcontrollers and 5-V legacy peripherals while maintaining JEDEC pin compatibility and industrial temperature operation.

FAQ

What is the maximum input voltage rating for TC74LCX540FK(EL,K) and how does it support 5-V interface applications?

The TC74LCX540FK(EL,K) supports DC input voltages from −0.5 V to 7.0 V and operates safely with 0 V to 5.5 V input levels. Its 5-V tolerance is implemented via internal clamp diodes and thick-oxide I/O structures, allowing direct connection to 5-V buses without external level shifters-enabling seamless integration into mixed-voltage systems where the TC74LCX540FK(EL,K) serves as a robust interface buffer.

Does TC74LCX540FK(EL,K) support operation at 1.8 V, and what are the timing implications?

Yes, TC74LCX540FK(EL,K) is fully specified for VCC = 1.8 ± 0.15 V per Toshiba's 2009+ manufacturing revision. At this voltage, propagation delay increases to 25.0 ns max, and output drive reduces to ±12 mA. These parameters are documented in the AC Characteristics table and ensure functional operation in ultra-low-power applications where the TC74LCX540FK(EL,K) maintains logic integrity despite reduced speed and current capability.

How does the dual output enable architecture of TC74LCX540FK(EL,K) improve system-level bus management?

The TC74LCX540FK(EL,K) features two independent active-low output enables (1OE and 2OE), each controlling four outputs (A1–A4/Y1–Y4 and A5–A8/Y5–Y8). This allows segmented bus isolation-for example, disabling memory address bits A0–A3 while keeping A4–A7 active-supporting flexible memory mapping, partial bus arbitration, and power-gating strategies not possible with single-OE buffers like the standard 74HC540. This functionality is intrinsic to the TC74LCX540FK(EL,K)'s logic design.

What thermal and reliability qualifications apply to TC74LCX540FK(EL,K) for industrial use?

TC74LCX540FK(EL,K) is rated for −40°C to +85°C operating temperature and complies with Toshiba's industrial reliability standards, including 1000-hour HTOL testing and JESD22-A114 ESD qualification (≥2 kV HBM). Its 180 mW power dissipation limit and thermal resistance (θJA ≈ 120°C/W in SOP-20) ensure stable operation in enclosed industrial enclosures without forced airflow-key for long-lifecycle deployments where the TC74LCX540FK(EL,K) functions as a mission-critical bus interface element.

Is TC74LCX540FK(EL,K) pin-compatible with standard 74-series octal buffers, and which variants are supported?

Yes, TC74LCX540FK(EL,K) is pin- and function-compatible with 74AC540, 74VHC540, 74HC540, and 74ALS540 per Toshiba's datasheet claim. All share identical SOP-20 pinout, inverting 3-state behavior, and dual-OE control. This compatibility enables direct PCB-level replacement in legacy designs-making the TC74LCX540FK(EL,K) a drop-in upgrade path for systems requiring 5-V tolerance and lower supply voltage operation without layout modification.

TC74LCX540FK(EL,K) Specifications

Product attributes: Attribute value

Manufacturer:: Toshiba Semiconductor and Storage

Series:: 74LCX

Package/Case:: 20-VFSOP (0.118", 3.00mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

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-VSSOP

TC74LCX540FK(EL,K) FAQ

1.How can I place an order for TC74LCX540FK(EL,K) through Aetrix?

Please submit a Request for Quotation (RFQ) for TC74LCX540FK(EL,K) 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 TC74LCX540FK(EL,K) reliable?

The price and inventory of TC74LCX540FK(EL,K) are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC74LCX540FK(EL,K) is usually 5 days.

3.What payment methods are accepted for TC74LCX540FK(EL,K)?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC74LCX540FK(EL,K) transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TC74LCX540FK(EL,K)?

TC74LCX540FK(EL,K) orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TC74LCX540FK(EL,K) 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 TC74LCX540FK(EL,K)?

For technical support, including TC74LCX540FK(EL,K) datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC74LCX540FK(EL,K) requirements.

6.How does Aetrix verify that TC74LCX540FK(EL,K) is sourced from the original manufacturer or authorized distributors?

All TC74LCX540FK(EL,K) 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 TC74LCX540FK(EL,K) meets industry standards.

7.What is the process for return or replacement of TC74LCX540FK(EL,K)?

All TC74LCX540FK(EL,K) units undergo pre-shipment inspection (PSI). If there is an issue with TC74LCX540FK(EL,K), 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 TC74LCX540FK(EL,K) part is unused and in its original packaging.

Return procedure for TC74LCX540FK(EL,K):

1.Submit a request within 90 days.

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

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