Nexperia USA Inc. 74LVTH244BD,118

Overview

74LVTH244BD,118 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. It delivers ±64 mA output drive and operates across -40 °C to +85 °C for industrial backplane and memory interface applications.

For engineers reviewing the 74LVTH244BD,118 datasheet, 74LVTH244BD,118 pinout, 74LVTH244BD,118 application, or 74LVTH244BD,118 equivalent, key selection criteria include 3-state timing (tPZH ≤ 4.5 ns), bus-hold current (IBHL = 75–130 μA), 5 V-tolerant input compatibility, and SO20 package thermal performance under 3.3 V supply.

Technical Context

This BiCMOS device implements two independent 4-bit 3-state buffers sharing a common 3.3 V supply (VCC = 2.7–3.6 V). Each buffer group (1Y0–1Y3 and 2Y0–2Y3) is controlled by its own active-low enable (1OE, 2OE), enabling selective bus isolation without contention.

Input pins feature integrated bus-hold circuitry with defined LOW/HIGH hold currents (IBHL/IBHH), and IOFF protection ensures sub-100 μA leakage during power-down. Inputs tolerate 5.5 V regardless of VCC, allowing direct interfacing with 5 V logic while driving 3.3 V buses.

Key Specifications

Pinout & Package

74LVTH244BD,118 is housed in a plastic small outline package (SO20, SOT163-1) with 20 leads and 7.5 mm body width. The package supports standard reflow soldering and provides adequate thermal dissipation for continuous 500 mW operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC244APWR and 74ALVC244MTCX, the 74LVTH244BD,118 uniquely combines 5.5 V input tolerance, integrated bus-hold, and IOFF protection-making it the only option among the three qualified for mixed-voltage hot-plug backplanes requiring zero external biasing and fail-safe power sequencing.

Availability

74LVTH244BD,118 is available at Aetrix Electronics and suitable for industrial backplane design, memory interface routing, and legacy system upgrades requiring stable component supply and long-term obsolescence management.

Supply support for 74LVTH244BD,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 focused on high-volume, high-reliability logic, analog, and MOSFET solutions for industrial, automotive, and computing markets.

The 74LVTH series targets high-speed, mixed-voltage digital interfacing-designed specifically for robust 3.3 V bus buffering with 5 V legacy compatibility in demanding industrial environments.

FAQ

What is the maximum input voltage the 74LVTH244BD,118 can safely tolerate?

The device accepts input voltages up to 5.5 V regardless of VCC level, verified per datasheet Table 4 (VI max = +7.0 V with clamp current limits observed). This allows direct connection to 5 V logic families without external protection or level-shifting circuitry, provided input clamp current remains below 50 mA.

Does the 74LVTH244BD,118 require external pull-up resistors on unused inputs?

No. The device integrates bus-hold circuitry on all data inputs (1A0–1A3, 2A0–2A3), maintaining valid logic states without external components. Typical bus-hold current is 75–130 μA for LOW and −75 to −140 μA for HIGH, sufficient to override typical PCB leakage and noise.

Can the 74LVTH244BD,118 be used in hot-swap applications?

Yes. Its IOFF circuitry limits power-off leakage to ±100 μA when VCC = 0 V and inputs/outputs are biased between 0–4.5 V, preventing back-driving and signal corruption during live insertion or extraction-verified per JEDEC JESD78 Class II Level B latch-up testing.

What is the worst-case propagation delay from OE assertion to output valid state?

The maximum tPZL (LOW-to-OFF) and tPZH (HIGH-to-OFF) delays are 4.4 ns each at VCC = 3.0–3.6 V, per Table 7. For enable-to-valid transitions, tPLZ and tPHZ are both rated ≤ 4.4 ns, ensuring deterministic 3-state control within sub-5 ns windows for high-speed bus arbitration.