Toshiba Semiconductor and Storage TC74LCX245FTELM

Overview

TC74LCX245FTELM from Toshiba Electronic Devices & Storage Corporation is a low-voltage octal bus transceiver designed for bidirectional 3.3 V ↔ 5.0 V level translation in mixed-supply systems. It operates from 1.65 V to 3.6 V V_CC, delivers 7.0 ns max propagation delay at 3.3 V, supports ±24 mA output drive, and features 5-V tolerant I/Os. It is used in FPGA-to-microcontroller interconnects where voltage domain bridging and bus isolation are required.

For engineers reviewing the TC74LCX245FTELM datasheet, TC74LCX245FTELM pinout, TC74LCX245FTELM application, or TC74LCX245FTELM equivalent, key selection criteria include 3.3 V supply compatibility, 5-V I/O tolerance, DIR/OE control logic, high-impedance three-state behavior, and JEITA SOP-20 package dimensions.

Technical Context

The TC74LCX245FTELM implements a dual-rail CMOS transceiver architecture with independent direction (DIR) and output enable (OE) controls. Its input and output stages are engineered to withstand 5.0 V signals while powered from 1.65–3.6 V, enabling safe interfacing between legacy 5-V logic and modern low-voltage ASICs or FPGAs.

Propagation delay is specified down to 7.0 ns (max) at V_CC = 3.3 V, and output disable/enable times are ≤8.5 ns. All inputs include ESD protection circuits, and power-down leakage remains ≤10.0 µA when V_IN/V_OUT = 5.5 V and V_CC = 0 V.

Key Specifications

Pinout & Package

TC74LCX245FTELM is packaged in JEITA-standard SOP-20 (300 mil width, 1.27 mm pitch), with 0.22 g typical mass and surface-mount footprint compatible with automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal bus transceiver applications.

Compared with SN74LVC245APWR and 74ALVC245MTCX, the TC74LCX245FTELM offers explicitly characterized 5-V I/O tolerance across full operating temperature, JEITA SOP-20 mechanical compatibility with legacy Japanese industrial boards, and documented 7.0 ns max delay guarantee - making it optimal for retrofitting 5-V legacy subsystems into 3.3-V control architectures.

Availability

TC74LCX245FTELM is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA-to-peripheral bridges, automotive infotainment displays, and ATE digital pattern generation requiring stable component supply and long-term lifecycle support.

Supply support for TC74LCX245FTELM 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 industrial and automotive-grade components.

The TC74LCX series targets low-voltage, high-speed bus interfacing in mixed-voltage embedded systems - emphasizing 5-V tolerance, JEDEC/IEC-compliant logic behavior, and long-lifecycle availability for industrial control and instrumentation.

FAQ

What is the maximum supply voltage for TC74LCX245FTELM?

The TC74LCX245FTELM has an absolute maximum V_CC rating of 7.0 V, but its functional operating range is strictly 1.65 V to 3.6 V. Operating outside this range may cause undefined logic states or accelerated wear. The TC74LCX245FTELM is not intended for use above 3.6 V V_CC, even though the absolute rating permits higher transient voltages.

Does TC74LCX245FTELM support true bidirectional 5-V to 3.3-V level translation?

Yes - the TC74LCX245FTELM supports bidirectional translation with 5-V tolerant I/Os on both A and B ports, allowing either side to serve as input or output depending on DIR state. Its VI/O rating of 0–5.5 V ensures safe operation when interfacing 5-V sources to 3.3-V logic, and the TC74LCX245FTELM maintains valid logic thresholds across the full −40 °C to +85 °C range.

What is the purpose of the OE and DIR pins on TC74LCX245FTELM?

The OE (output enable) pin controls three-state output behavior: LOW enables data transmission, HIGH places all A/B pins in high-impedance mode for bus isolation. DIR (direction) selects data flow: LOW routes A→B, HIGH routes B→A. These two pins allow precise control of bus arbitration and signal routing in shared-memory or peripheral-interconnect applications using the TC74LCX245FTELM.

Can TC74LCX245FTELM be used without pull-up or pull-down resistors on floating bus lines?

No - the TC74LCX245FTELM datasheet explicitly requires that all floating (high-impedance) bus pins be fixed to defined logic levels using external pull-up or pull-down resistors. Leaving A or B pins unconnected during OE HIGH can cause increased ICC, noise susceptibility, or latch-up. This requirement applies directly to TC74LCX245FTELM in any three-state configuration.

Is TC74LCX245FTELM pin-compatible with standard 74-series 245 transceivers?

Yes - the TC74LCX245FTELM is pin- and function-compatible with 74AC/VHC/HC/F/ALS/LS 245 devices in JEITA SOP-20 packaging. Its pin assignment matches industry-standard 245 logic, including identical DIR, OE, A/B port mapping and power/ground locations - enabling direct replacement in legacy 74-series designs without PCB modification.