Nexperia USA Inc. 74LVC245AD,112

Overview

74LVC245AD,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, supports mixed-voltage translation (3.3 V ↔ 5 V tolerant inputs), and features Schmitt-trigger inputs and IOFF partial power-down protection. Used in FPGA-to-ASIC interconnects, memory expansion buses, and industrial controller backplanes.

For engineers reviewing the 74LVC245AD,112 datasheet, 74LVC245AD,112 pinout, 74LVC245AD,112 application, or 74LVC245AD,112 equivalent, key selection criteria include voltage translation capability across 1.2–3.6 V supply, 8-bit bidirectional bus isolation with <8.0 ns propagation delay at 3.3 V, IOFF-enabled hot-swap safety, and SO20 package thermal performance up to +125 °C ambient.

Technical Context

This device implements a dual-rail CMOS transceiver architecture with independent direction (DIR) and output-enable (OE) control logic. All 16 I/O pins (A0–A7, B0–B7) are overvoltage-tolerant to 5.5 V and feature Schmitt-trigger inputs for noise immunity on slow-rising signals.

The IOFF circuit actively disables outputs when VCC = 0 V, blocking backflow current during partial power-down-critical for live-insertion systems. Bus hold functionality is absent in the 74LVC245A variant (present only in 74LVCH245A), confirming this part relies on external termination or system-level hold.

Key Specifications

Pinout & Package

74LVC245AD,112 uses the SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads. Thermal resistance θJA = 109 °C/W (JEDEC JESD51-2 standard).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC245APWR, the 74LVC245AD,112 offers superior hot-swap safety via IOFF; compared with 74LVCH245AD,112, it trades bus-hold for lower static current and reduced input capacitance-ideal for high-frequency clock distribution paths.

Availability

74LVC245AD,112 is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA-to-ASIC interconnects, and automotive body control modules requiring stable component supply across extended temperature ranges.

Supply support for 74LVC245AD,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 logic, analog, and MOSFET solutions with focus on efficiency, reliability, and miniaturization.

The 74LVC245A belongs to Nexperia's LVC (Low-Voltage CMOS) logic family, engineered for low-power, high-speed bidirectional bus interfacing in mixed-voltage embedded systems.

FAQ

Can 74LVC245AD,112 translate between 1.8 V and 5 V logic without external components?

Yes-it accepts 5 V inputs while operating from a 1.8 V supply due to its 5.5 V overvoltage-tolerant inputs. The outputs swing rail-to-rail (0 V to 1.8 V), so downstream 5 V devices require compatible input thresholds (e.g., TTL-compatible 2.0 V VIH minimum). No external resistors or level shifters are needed for unidirectional 5 V → 1.8 V signal reception.

What is the maximum data rate supported by 74LVC245AD,112 in a 3.3 V system?

With typical propagation delay of 2.9 ns and output skew ≤1.5 ns at VCC = 3.3 V, the device supports clean 100 MHz bus operation (10 ns period). For reliable timing closure, limit trace lengths to ≤15 cm on FR-4 and maintain controlled impedance (50 Ω) when driving capacitive loads >20 pF.

Does 74LVC245AD,112 require external pull-up or pull-down resistors on DIR and OE?

Yes-DIR and OE have no internal weak pull-ups. OE must be held LOW for normal operation; floating OE causes unpredictable 3-state behavior. DIR should be actively driven (not left floating) to avoid metastability during power-up. Typical values: 10 kΩ to VCC for OE pull-down, 10 kΩ to GND for DIR pull-down if default A→B direction is required.

How does IOFF protection function during system power sequencing?

When VCC drops below ~0.8 V, the IOFF circuit activates and forces all outputs into high-impedance state-even if OE is LOW or DIR is asserted. This blocks reverse current flow from live 5 V buses into the unpowered IC, preventing latch-up and damage during staggered power-down sequences in multi-rail systems.