Nexperia USA Inc. 74LVTH244AD,112

Overview

74LVTH244AD,112 from Nexperia is a 3.3 V octal buffer/line driver with 3-state outputs, designed for bus interface applications in industrial and embedded systems. It features dual output enables (1OE, 2OE), ±32 mA/±64 mA drive capability, overvoltage-tolerant inputs up to 5.5 V, bus hold circuitry eliminating external pull-ups, and operates across -40 °C to +85 °C.

For engineers reviewing the 74LVTH244AD,112 datasheet, 74LVTH244AD,112 pinout, 74LVTH244AD,112 application, or 74LVTH244AD,112 equivalent, key selection criteria include 3-state timing (tPZH ≤ 5.2 ns), IOFF power-down support, 2.7–3.6 V supply range, and SO20 package compatibility with legacy 74-series layouts.

Technical Context

This BiCMOS device implements two independent 4-bit 3-state buffers, each controlled by its own active-low output enable (1OE for Y0–Y3 group, 2OE for Y0–Y3 of second bank). Input logic levels are TTL-compatible, and outputs tolerate 5 V bus ties without current loading.

The integrated bus hold circuit maintains valid logic states on unused inputs (IBHL = 75–150 μA LOW, IBHH = −75 to −150 μA HIGH), while IOFF protection ensures low leakage (< ±100 μA) during partial power-down. Propagation delays are specified at 1–4.1 ns (VCC = 3.0–3.6 V), supporting high-speed data routing.

Key Specifications

Pinout & Package

74LVTH244AD,112 is supplied in SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads. Pin 1 index located at top-left corner with notch or dot marking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Compared with SN74LVC244APWR and 74ALVC244PW, the 74LVTH244AD,112 uniquely combines 5.5 V input tolerance, bus hold, IOFF, and ±64 mA drive-making it the only option for industrial backplanes requiring hot-swap resilience and mixed-voltage interoperability.

Availability

74LVTH244AD,112 is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded memory expansion buses, legacy ISA adapters, and test equipment signal multiplexers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 74LVTH244AD,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 discrete, logic, and MOSFET solutions with focus on efficiency, reliability, and miniaturization for industrial, automotive, and consumer markets.

The 74LVTH series targets high-speed, robust bus interface applications in harsh environments-designed specifically for systems demanding 5 V tolerance, hot-swap capability, and extended temperature operation.

FAQ

Can 74LVTH244AD,112 safely drive a 5 V bus while powered from 3.3 V?

Yes. Its inputs are overvoltage tolerant up to 5.5 V, and outputs feature IOFF circuitry that blocks current flow when VCC = 0 V. When powered at 3.3 V, outputs swing between 0 V and ~3.1 V (VOH min = 2.0 V @ IOH = −32 mA), which meets TTL HIGH threshold requirements for 5 V systems. No external clamping or level shifting is needed.

What is the purpose of the bus hold feature, and how does it affect PCB layout?

The bus hold circuit actively maintains the last-valid logic state on unused inputs using 75–150 μA of holding current-eliminating the need for external 4.7–10 kΩ pull-up or pull-down resistors. This reduces component count, saves PCB space, and removes resistor placement constraints near connectors or sparsely populated headers.

How does the dual output enable (1OE/2OE) improve system-level design flexibility?

1OE controls Y0–Y3 outputs; 2OE controls Y0–Y3 of the second bank. This allows independent gating of two 4-bit data groups-enabling time-multiplexed bus sharing, per-module isolation in modular systems, or simultaneous enable of non-contiguous signals without additional logic gates or firmware overhead.

Is thermal performance sufficient for continuous operation in a 70 °C ambient enclosure?

Yes. Rated for −40 °C to +85 °C ambient operation, with Ptot = 500 mW maximum and junction temperature limit of 150 °C. In SO20 package with typical PCB copper pour, thermal resistance θJA ≈ 70 °C/W yields ~35 °C rise at 500 mW-well within margin at 70 °C ambient. No heatsink required for standard use.