Nexperia USA Inc. 74LVTH244BDB,112

Overview

74LVTH244BDB,112 from Nexperia is a 3.3 V octal buffer/line driver with dual 3-state outputs, designed for bidirectional bus interfacing in mixed-voltage systems. It features two independent output-enable inputs (1OE, 2OE), bus-hold inputs eliminating external pull-ups, and ±64 mA/–32 mA drive capability. Used in industrial control backplanes and FPGA I/O expansion where 3.3 V logic must interface with 5 V-tolerant buses.

For engineers reviewing the 74LVTH244BDB,112 datasheet, 74LVTH244BDB,112 pinout, 74LVTH244BDB,112 application, or 74LVTH244BDB,112 equivalent, key selection criteria include 5.5 V overvoltage-tolerant inputs, power-up 3-state behavior, IOFF partial power-down support, and propagation delays under 3.5 ns at 3.3 V.

Technical Context

This BiCMOS device implements two independent 4-bit non-inverting buffers, each controlled by its own active-low output enable (1OE for Y0–Y3, 2OE for Y0'–Y3'). Inputs tolerate up to 5.5 V regardless of VCC, enabling safe interfacing with legacy 5 V systems while operating from 2.7–3.6 V.

The bus-hold circuitry maintains stable logic states on unused inputs without external resistors, and the IOFF feature disables output leakage when VCC = 0 V-critical for live insertion and hot-swap applications. Propagation delays are specified down to 1.1 ns (tPLH) and 1.3 ns (tPHL) at 3.3 V.

Key Specifications

Pinout & Package

74LVTH244BDB,112 is supplied in SO20 (SOT163-1) package: plastic small outline, 20 leads, 7.5 mm body width, 1.27 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC244APWR and 74ALVCH162244DGGR, the 74LVTH244BDB,112 uniquely combines 5.5 V input tolerance, bus hold, IOFF, and ±64 mA drive in an industry-standard SO20 package-making it the only drop-in solution for mixed-voltage industrial backplanes requiring robust hot-swap and legacy interoperability.

Availability

74LVTH244BDB,112 is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA I/O expansion, hot-swappable module carriers, and memory subsystem isolation requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for 74LVTH244BDB,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 optimized for efficiency, reliability, and manufacturability in industrial and automotive applications.

The 74LVTH244BDB,112 belongs to Nexperia's LVT family-designed specifically for high-speed, mixed-voltage bus interfacing where 3.3 V logic must coexist with 5 V legacy infrastructure without external level-shifting components.

FAQ

Does 74LVTH244BDB,112 support live insertion in powered backplanes?

Yes. Its IOFF circuitry blocks current flow when VCC = 0 V, and power-up 3-state ensures outputs remain high-impedance until supply stabilizes. Combined with ±100 μA IOFF leakage and JESD78 Class II latch-up immunity (>500 mA), it meets CompactPCI and PICMG 2.0 hot-swap requirements without additional protection circuitry.

Can 74LVTH244BDB,112 safely drive a 5 V bus directly?

No-it cannot source/sink into a 5 V rail, but its inputs tolerate up to 5.5 V regardless of VCC. Outputs swing from GND to VCC (max 3.6 V), so connecting them directly to a 5 V bus risks damaging downstream receivers. Use only as a 3.3 V driver feeding 3.3 V-compatible loads or with external level-shifting for 5 V signaling.

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

Bus hold actively maintains the last valid logic state on unused inputs using internal feedback transistors. This eliminates the need for external 10 kΩ pull-up/pull-down resistors, reducing component count, board area, and potential noise coupling-especially beneficial in dense FPGA carrier designs where routing space is constrained.

How does the dual OE architecture improve system-level timing control?

Dual OE inputs (1OE and 2OE) allow independent gating of two 4-bit groups-enabling time-multiplexed bus access (e.g., address vs. data phases) or fault-isolated shutdown. This reduces timing skew versus single-OE octal buffers and simplifies control logic by eliminating need for external demultiplexing or gating gates.