Toshiba Semiconductor and Storage TC74LCX541F(EL,K,F

Overview

TC74LCX541F(EL,K,F) from Toshiba Electronic Devices & Storage Corporation is a low-voltage octal non-inverting 3-state bus buffer with dual active-low output enables (OE1, OE2), designed for 3.3-V systems while supporting 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 VCC = 1.65–3.6 V. It serves as a level-shifting address/data bus driver in mixed-voltage memory interfaces.

For engineers reviewing the TC74LCX541F(EL,K,F) datasheet, TC74LCX541F(EL,K,F) pinout, TC74LCX541F(EL,K,F) application, or TC74LCX541F(EL,K,F) equivalent, key selection criteria include 5-V tolerance on all I/Os, dual independent output enable control, guaranteed 3.3-V high-speed timing, and JEITA SOP-20 package compatibility with legacy 74-series logic footprints.

Technical Context

The TC74LCX541F(EL,K,F) implements a CMOS-based non-inverting buffer architecture with two separate active-low output enable inputs controlling eight buffered outputs. Its input protection circuits support ESD robustness, and power-down leakage current is limited to ≤10.0 µA when VCC = 0 V and I/Os biased to 5.5 V.

It achieves voltage-level interoperability via 5-V-tolerant I/Os that function correctly with VIN/VOUT up to 5.5 V regardless of VCC (1.65–3.6 V), enabling direct interfacing between 3.3-V logic and 5-V peripherals without external level shifters. Propagation delay and output enable/disable times are characterized down to VCC = 1.8 V (±0.15 V) for low-power operation.

Key Specifications

Pinout & Package

TC74LCX541F(EL,K,F) is packaged in JEITA-standard SOP-20 (SOP20-P-300-1.27A), a 20-pin surface-mount plastic small-outline package with 1.27 mm lead pitch, 7.6 mm body width, and 0.22 g typical weight.

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 TC74LCX541F(EL,K,F) uniquely combines full 5-V I/O tolerance, JEITA SOP-20 footprint compatibility with legacy 74-series logic, and sub-7-ns propagation delay - making it optimal for retrofitting 3.3-V controllers into existing 5-V bus architectures without layout changes.

Availability

TC74LCX541F(EL,K,F) is available at Aetrix Electronics and suitable for memory address buffering, industrial I/O expansion, legacy peripheral interface, and embedded system bus isolation requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for TC74LCX541F(EL,K,F) 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 CMOS process technology and industrial-grade reliability.

The TC74LCX541F(EL,K,F) belongs to Toshiba's LCX low-voltage CMOS logic family, engineered for seamless voltage-domain bridging in mixed-supply embedded systems - particularly targeting industrial control, test equipment, and legacy-system upgrades.

FAQ

What is the maximum operating frequency supported by the TC74LCX541F(EL,K,F)?

The TC74LCX541F(EL,K,F) does not specify a maximum clock frequency directly, but its 6.5 ns max propagation delay at VCC = 3.3 V supports reliable operation in bus systems with cycle times ≥13 ns - corresponding to effective data rates up to ~77 MHz for single-edge signaling. Actual usable frequency depends on load capacitance, trace routing, and system timing margins.

Can the TC74LCX541F(EL,K,F) drive 5-V TTL loads directly?

Yes, the TC74LCX541F(EL,K,F) can drive 5-V TTL loads directly: its outputs are 5-V tolerant and deliver VOH ≥ 2.2 V at IOH = −24 mA (VCC = 3.0 V), exceeding the 2.0 V minimum VIH requirement of standard TTL. No external pull-up resistors or level shifters are needed for compatibility.

Is the TC74LCX541F(EL,K,F) pin-compatible with standard 74-series 541 devices?

Yes, the TC74LCX541F(EL,K,F) is pin- and function-compatible with 74AC/VHC/HC/F/ALS/LS 541-type octal buffers in JEITA SOP-20 packages. Pin assignments for A1–A8, Y1–Y8, OE1, OE2, VCC, and GND match industry-standard 20-pin 541 footprints, enabling drop-in replacement.

Does the TC74LCX541F(EL,K,F) require external pull-up resistors on its output enables?

No, the TC74LCX541F(EL,K,F) does not require external pull-up resistors on OE1 or OE2. These inputs accept standard CMOS logic levels and feature internal protection circuits; they must be actively driven high or low - floating inputs are undefined and must be avoided per datasheet guidance.

What is the thermal performance of the TC74LCX541F(EL,K,F) in continuous operation?

The TC74LCX541F(EL,K,F) has a maximum power dissipation of 180 mW and operates across −40°C to +85°C. At VCC = 3.3 V and full 24-mA output loading on all eight channels, junction temperature rise remains within safe limits on standard FR-4 PCBs with 2 oz copper and minimal copper pour - no heatsink is required under typical industrial conditions.