Nexperia USA Inc. 74LVC245ADB,118

Overview

74LVC245ADB,118 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, supports 5.5 V-tolerant inputs, features Schmitt-trigger inputs for noise immunity, and includes IOFF circuitry for partial power-down protection. It enables level translation between 3.3 V and 5 V domains in memory interface and microcontroller peripheral buses.

For engineers reviewing the 74LVC245ADB,118 datasheet, 74LVC245ADB,118 pinout, 74LVC245ADB,118 application, or 74LVC245ADB,118 equivalent, key selection criteria include supply voltage range (1.2–3.6 V), 5.5 V overvoltage tolerance, IOFF-enabled hot-swap capability, propagation delay ≤8.0 ns at 3.3 V, and SO20 package compatibility with legacy 74-series footprints.

Technical Context

This device implements a dual-bus, direction-controlled transceiver architecture with independent A- and B-side 8-bit I/O ports. Direction control is asserted via the DIR pin (LOW = A→B, HIGH = B→A), while OE (active LOW) places all outputs in high-impedance state. The IOFF circuit disables outputs when VCC = 0 V, preventing back-current during power sequencing.

Schmitt-trigger inputs ensure robust operation with slow-rising signals (Δt/ΔV up to 20 ns/V at 1.2 V), and bus hold functionality (on 74LVCH variant only) is absent in this 74LVC245A version. It complies with JEDEC standards JESD8-7A, JESD8-5A, and JESD8-C/JESD36 across its operating voltage bands.

Key Specifications

Pinout & Package

74LVC245ADB,118 is supplied in a plastic small outline package (SO20, SOT163-1) with 20 leads, 7.5 mm body width, and standard 1.27 mm lead pitch. Pin 1 is marked by a notch or bevel on the package top edge.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVC245ADB,118, the TSSOP variant saves board area but trades off thermal margin, while the TI alternative offers tighter IOFF control at the cost of vendor-specific qualification and longer lead times.

Availability

74LVC245ADB,118 is available at Aetrix Electronics and suitable for memory interface, microcontroller peripheral expansion, FPGA configuration, and industrial PLC backplane applications requiring stable component supply across extended temperature ranges and mixed-voltage operation.

Supply support for 74LVC245ADB,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 miniaturization for industrial, automotive, and consumer markets.

The 74LVC series targets low-voltage, high-speed digital interfacing with emphasis on voltage translation, bus isolation, and power-aware design for embedded systems and programmable logic platforms.

FAQ

Can 74LVC245ADB,118 operate at 1.2 V while driving 5 V-tolerant loads?

Yes - the device functions correctly at 1.2 V supply and accepts input voltages up to 5.5 V regardless of VCC level. However, output HIGH voltage is limited to VCC − 0.2 V (≈1.0 V at 1.2 V), so it cannot actively drive 5 V logic thresholds; it serves only as a receiver from 5 V sources, not a driver to them.

What is the maximum data rate supported by 74LVC245ADB,118?

Based on propagation delay ≤8.0 ns at 3.3 V and setup/hold margins, the device supports reliable operation up to 25 MHz bus clock frequency (40 ns period). For sustained 50 MHz operation, derating for temperature, capacitive loading, and signal integrity margins is required.

Does 74LVC245ADB,118 include bus-hold circuitry on its inputs?

No - bus-hold functionality is exclusive to the 74LVCH245A variant. The 74LVC245A (including 74LVC245ADB,118) lacks internal bus-hold resistors, so external pull-up/pull-down resistors are required on floating A/B inputs to prevent undefined logic states.

How does IOFF protect the device during hot-swap events?

When VCC drops to 0 V, the IOFF circuit disables all output drivers, limiting OFF-state leakage to ±20 μA. This prevents reverse current from live B-side or A-side buses flowing through the transceiver into the unpowered VCC rail, protecting upstream regulators and avoiding latch-up risk.