Nexperia USA Inc. 74LVCH245APW,118

Overview

74LVCH245APW,118 from Nexperia is an octal 3-state bus transceiver with direction control (DIR) and active-low output enable (OE), operating from 1.2 V to 3.6 V supply. It supports mixed-voltage interfacing (3.3 V ↔ 5 V inputs), features bus hold on all data inputs, and includes IOFF partial power-down protection. Used in bidirectional data buses between microcontrollers and peripheral ICs in industrial control systems.

For engineers reviewing the 74LVCH245APW,118 datasheet, 74LVCH245APW,118 pinout, 74LVCH245APW,118 application, or 74LVCH245APW,118 equivalent, key selection factors include its 1.2–3.6 V supply range, 5.5 V overvoltage-tolerant inputs, bus hold functionality, IOFF current limiting, and TSSOP20 package compatibility with high-density PCB layouts.

Technical Context

This device implements a dual-rail bidirectional data path controlled by DIR and OE signals: DIR selects A→B or B→A data flow, while OE disables outputs into high-impedance state. Schmitt-trigger inputs tolerate slow edge rates, enabling robust operation with noisy or low-slew-rate sources.

The 74LVCH245A variant integrates bus hold circuitry on all eight A-side data pins (A0–A7), eliminating external pull-up/down resistors in floating-bus scenarios. Its IOFF feature actively blocks backflow current when VCC = 0 V, supporting hot-swap and partial-power-down system architectures.

Key Specifications

Pinout & Package

TSSOP20 plastic thin shrink small outline package (SOT360-1), 20-lead, 4.4 mm body width, 0.65 mm pitch, exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC245APWR and 74LVC245APW,118, the 74LVCH245APW,118 uniquely delivers bus hold + IOFF in the same TSSOP20 footprint-enabling robust floating-bus operation and safe power sequencing without design compromises.

Availability

74LVCH245APW,118 is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded microcontroller expansion buses, automotive body control modules, and test equipment digital I/O cards requiring stable component supply across extended temperature ranges.

Supply support for 74LVCH245APW,118 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 logic, analog, and MOSFET solutions with focus on efficiency, reliability, and sustainability.

The 74LVCH245A belongs to Nexperia's LVC/LVCH logic family, engineered for low-voltage, mixed-signal interfacing in space-constrained industrial and automotive applications where voltage translation, bus integrity, and power sequencing safety are critical.

FAQ

What is the function of the DIR pin on the 74LVCH245APW,118?

The DIR (direction) pin controls data flow direction: when DIR is LOW, data passes from port A (pins 2–9) to port B (pins 11–18); when DIR is HIGH, data flows from port B to port A. It is a CMOS input referenced to VCC, with Schmitt-trigger action for noise immunity and compatible with 1.2–3.6 V logic levels.

Does the 74LVCH245APW,118 support 5 V input signals while powered from 3.3 V?

Yes - all inputs (A0–A7, B0–B7, DIR, OE) tolerate up to 5.5 V regardless of VCC voltage (1.2–3.6 V). This allows safe interfacing with 5 V TTL or CMOS outputs without external level-shifting components, as confirmed in Table 5 (Recommended Operating Conditions) and Section 1.

How does the bus hold feature operate, and on which pins is it active?

Bus hold is active only on A0–A7 (pins 2–9) and maintains the last-valid logic state when those inputs are floating. It draws ±10 μA to ±500 μA depending on VCC and input voltage (Table 6), eliminating need for external pull resistors. Control pins (DIR, OE) and B-side pins do not have bus hold, per datasheet Section 9 footnote [4].

Can the 74LVCH245APW,118 be used in hot-swap applications?

Yes - its IOFF circuitry disables outputs and limits leakage to ±20 μA when VCC = 0 V (Table 6), preventing damaging back-current from live backplane traces into the unpowered device. This enables safe insertion/removal in powered systems, as explicitly stated in Section 1 and validated in Table 6's IOFF parameter.