Toshiba Semiconductor and Storage TC74LCX541FT(EL)

Overview

TC74LCX541FT(EL) from Toshiba Electronic Devices & Storage Corporation is a non-inverting octal 3-state bus buffer with dual active-low output enables, designed for 3.3-V logic systems interfacing to 5-V environments. It operates from 1.65 V to 3.6 V, delivers 6.5 ns max propagation delay at 3.3 V, and supports ±24 mA output drive - used in memory address driver circuits requiring level translation and bus isolation.

For engineers reviewing the TC74LCX541FT(EL) datasheet, TC74LCX541FT(EL) pinout, TC74LCX541FT(EL) application, or TC74LCX541FT(EL) equivalent, key selection criteria include 5-V tolerant I/O, dual OE control for flexible bus gating, low quiescent current (≤10 µA), and JEITA SOP-20 package compatibility with legacy 74-series footprints.

Technical Context

The TC74LCX541FT(EL) implements a CMOS-based non-inverting buffer architecture with two independent active-low output enable inputs (OE1, OE2), where either high signal forces all eight Y outputs into high-impedance state. Its input protection circuitry enables safe operation across 0–5.5 V input voltage range regardless of VCC.

It achieves 5-V tolerance via internal clamping diodes and power-down protection on all I/O terminals, allowing hot-swap capability and robustness against floating inputs. The device maintains rail-to-rail output swing (VOH ≥ VCC−0.2 V, VOL ≤ 0.55 V at 24 mA) while meeting tpd ≤ 6.5 ns and output skew ≤ 1.0 ns at 3.3 V.

Key Specifications

Pinout & Package

TC74LCX541FT(EL) is packaged in JEITA-standard SOP-20 (300 mil width, 1.27 mm pitch), with 20-pin surface-mount configuration optimized for automated assembly and thermal reliability in industrial PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal non-inverting 3-state buffer applications.

Compared with 74LVC541APW,118 and SN74LVCH16244ADGGR, the TC74LCX541FT(EL) uniquely combines guaranteed 5-V I/O tolerance, dual OE control in SOP-20, and proven industrial temperature operation - making it optimal for retrofitting legacy 5-V systems with modern low-voltage controllers.

Availability

TC74LCX541FT(EL) is available at Aetrix Electronics and suitable for industrial automation, embedded instrumentation, and legacy system upgrades requiring stable component supply, long-lifecycle support, and guaranteed 5-V tolerant bus interfacing.

Supply support for TC74LCX541FT(EL) 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 solutions for industrial, automotive, and consumer applications, with emphasis on power efficiency, signal integrity, and long-term supply stability.

The TC74LCX541FT(EL) belongs to Toshiba's LCX low-voltage CMOS logic family, engineered specifically for mixed-voltage system interfacing - balancing speed, drive strength, and robustness in space-constrained industrial PCBs.

FAQ

What is the maximum operating voltage on inputs and outputs of the TC74LCX541FT(EL)?

The TC74LCX541FT(EL) supports DC input and output voltages from −0.5 V to 5.5 V regardless of VCC level, enabling safe interfacing with 5-V logic families. This 5-V tolerance is guaranteed across the full operating temperature range (−40°C to +85°C) and does not require external clamping components. The absolute maximum rating extends to 7.0 V, but sustained operation above 5.5 V is not recommended.

Does the TC74LCX541FT(EL) support hot-swap or partial power-down scenarios?

Yes, the TC74LCX541FT(EL) includes power-down protection on all inputs and outputs, allowing it to remain safely connected when VCC = 0 V while inputs or outputs are biased at up to 5.5 V. This feature prevents damaging current flow during hot-insertion or system-level power sequencing - a key requirement in modular PLC backplanes and field-upgradeable embedded systems using the TC74LCX541FT(EL).

What is the propagation delay specification for TC74LCX541FT(EL) at 2.5 V supply?

At VCC = 2.5 V ± 0.2 V, the TC74LCX541FT(EL) has a maximum propagation delay (tpLH/tpHL) of 8.5 ns under standard AC test conditions (CL = 50 pF, RL = 500 Ω). This value is measured across all eight channels and confirmed in the official Toshiba datasheet revision dated 2026-04-21, ensuring predictable timing margins in 2.5-V FPGA or ASIC interface designs using the TC74LCX541FT(EL).

Is TC74LCX541FT(EL) pin-compatible with standard 74-series logic devices?

Yes, the TC74LCX541FT(EL) is functionally and physically pin-compatible with industry-standard 74AC, 74VHC, 74HC, 74F, and 74LS variants of the 541 octal buffer. Its SOP-20 footprint matches JEDEC MS-013 and JEITA P-002A standards, and its truth table and electrical behavior align with the 74x541 family - enabling direct replacement in legacy designs without PCB modification.

What package type and dimensions does TC74LCX541FT(EL) use?

The TC74LCX541FT(EL) uses a JEITA-standard SOP-20 package (300 mil body width, 1.27 mm lead pitch), designated as SOP20-P-300-1.27A. Its typical weight is 0.22 g, and it complies with RoHS directives. This package supports reflow soldering per J-STD-020 and provides adequate thermal dissipation (180 mW max PD) for continuous operation in industrial ambient temperatures.