Nexperia USA Inc. 74LVCH245AD,112

Overview

74LVCH245AD,112 from Nexperia is an octal 3-state bus transceiver with bidirectional data flow controlled by DIR and output enable (OE) inputs. It operates from 1.2 V to 3.6 V, tolerates 5.5 V inputs, features bus hold on all data inputs, and supports mixed-voltage translation between 3.3 V and 5 V systems in industrial control backplanes.

For engineers reviewing the 74LVCH245AD,112 datasheet, 74LVCH245AD,112 pinout, 74LVCH245AD,112 application, or 74LVCH245AD,112 equivalent, this device is selected for level-shifting I/O expansion, isolated bus buffering with high-impedance control, and robust operation in -40 °C to +125 °C environments requiring IOFF partial power-down protection.

Technical Context

The 74LVCH245AD,112 implements dual-rail CMOS logic with Schmitt-trigger inputs for noise immunity and slow-edge tolerance. Its DIR input selects A→B or B→A data direction, while active-low OE enables/disables all outputs simultaneously into high-impedance state.

IOFF circuitry ensures zero backflow current during partial power-down, and bus hold functionality maintains valid logic states at A/B data pins without external pull resistors-critical for hot-swap and floating-bus reliability in modular systems.

Key Specifications

Pinout & Package

SOT163-1 (SO20) plastic small outline package, 20-pin, 7.5 mm body width, standard gull-wing lead form compatible with IPC-7351B footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVC245AD,112 and SN74LVC8T245RHLR, the 74LVCH245AD,112 uniquely combines bus hold, IOFF, and SO20 compatibility-making it optimal for retrofit upgrades and thermally constrained industrial boards where reliability under undefined bus states is critical.

Availability

74LVCH245AD,112 is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded I/O expansion, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVCH245AD,112 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

Nexperia is a global semiconductor expert delivering high-performance, reliable components for automotive, industrial, and consumer applications with leadership in logic, MOSFETs, and ESD protection.

The 74LVCH245AD,112 belongs to Nexperia's LVC/LVCH logic family, engineered specifically for robust mixed-voltage interfacing in harsh environments where bus stability, power-down safety, and wide operating margins are non-negotiable.

FAQ

What is the maximum clock/data rate supported by the 74LVCH245AD,112?

The device does not operate as a clocked register but as a transparent transceiver. Its propagation delay ranges from 1.5 ns to 8.0 ns depending on VCC and temperature, supporting reliable data transfer up to approximately 125 MHz in well-terminated, low-capacitance bus configurations with proper layout practices.

Can the 74LVCH245AD,112 safely interface a 5 V microcontroller with a 1.8 V FPGA?

Yes - its inputs tolerate up to 5.5 V regardless of VCC, and its outputs swing rail-to-rail within the 1.2 V to 3.6 V supply range. With VCC = 1.8 V, it delivers valid 1.8 V logic levels to the FPGA while accepting 5 V signals from the microcontroller without damage or external components.

Does the bus hold feature apply to the DIR and OE control inputs?

No - bus hold is implemented only on the A0–A7 and B0–B7 data I/O pins. DIR and OE are standard CMOS inputs without bus hold; they require defined logic states (e.g., pull-up/pull-down resistors) in systems where those lines may float during power-up or reset sequences.

How does IOFF behavior differ from standard 3-state disable in partial power-down scenarios?

Standard 3-state disables outputs but leaves input structures active, risking back-current if driven while VCC = 0 V. IOFF actively disables both input and output circuitry, limiting leakage to ±10 μA max - preventing latch-up, cross-talk, and unintended power injection into unpowered sections of the system.