Nexperia USA Inc. 74LVTH244BD,112

Overview

74LVTH244BD,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 overvoltage-tolerant inputs up to 5.5 V. Its ±64 mA/−32 mA drive capability supports driving terminated transmission lines in industrial control backplanes.

For engineers reviewing the 74LVTH244BD,112 datasheet, 74LVTH244BD,112 pinout, 74LVTH244BD,112 application, or 74LVTH244BD,112 equivalent, key selection criteria include 3-state timing (tPZH ≤ 4.5 ns), bus-hold current (IBHL = 75–130 μA), supply range (2.7–3.6 V), and SO20 package compatibility with legacy 74LVT designs.

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 Y4–Y7). Inputs tolerate 5 V while operating from a 3.3 V supply, enabling direct interfacing between 3.3 V logic and 5 V buses without level shifters.

The IOFF circuitry ensures power-down isolation when VCC = 0 V, limiting off-state leakage to ±100 μA. Bus-hold functionality maintains valid logic states on unused inputs with IBHH = −140 to −75 μA (HIGH) and IBHL = 75–130 μA (LOW), eliminating external biasing components.

Key Specifications

Pinout & Package

74LVTH244BD,112 is housed in a plastic small outline package (SO20, SOT163-1) with 20 leads and 7.5 mm body width. Pin 1 is marked by a notch or dot; pin numbering follows standard counter-clockwise convention from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC244APWR and 74ALVCH244PW, the 74LVTH244BD,112 uniquely combines 5.5 V input tolerance, bus-hold, and ±64 mA drive in a single SO20 package - making it the only option for robust 3.3 V-to-5 V bridging without supplemental components.

Availability

74LVTH244BD,112 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy bus extensions, hot-swappable module interconnects, and embedded control bus isolation requiring stable component supply across extended temperature ranges.

Supply support for 74LVTH244BD,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 consumer applications.

The 74LVTH244B series belongs to Nexperia's advanced LVT logic family, engineered specifically for high-speed, mixed-voltage bus interfacing in industrial automation, telecom infrastructure, and legacy system upgrades.

FAQ

What is the maximum input voltage the 74LVTH244BD,112 can safely accept?

The device accepts input voltages up to 5.5 V regardless of VCC level, verified per Absolute Maximum Ratings (Table 4). This allows direct connection to 5 V TTL buses while operating from a 3.3 V supply, with no risk of damage or latch-up under normal operating conditions.

Does the 74LVTH244BD,112 require external pull-up resistors on unused inputs?

No. Integrated bus-hold circuitry actively maintains the last-valid logic state on unconnected inputs, with IBHL = 75–130 μA (LOW) and IBHH = −140 to −75 μA (HIGH). This eliminates external pull-up/pull-down components and improves board-level noise immunity.

Can the 74LVTH244BD,112 be used in hot-swap applications?

Yes. It is qualified for live insertion and extraction per JEDEC standards, with latch-up immunity exceeding 500 mA (JESD78 Class II Level B) and IOFF circuitry limiting leakage to ±100 μA when VCC = 0 V - preventing back-powering or bus contention during module replacement.

How does the dual output-enable architecture improve system design?

Independent 1OE and 2OE pins allow separate control of two 4-bit output groups (Y0–Y3 and Y4–Y7), enabling segmented bus arbitration, reduced contention windows, and dynamic power gating of subsystems - critical for modular backplanes and reconfigurable I/O architectures.