Texas Instruments SN74LVTH240GQNR

Overview

SN74LVTH240GQNR from Texas Instruments is a 3.3-V ABT octal buffer/driver with 3-state outputs, designed for mixed-mode signal operation (5-V inputs/outputs with 3.3-V V_CC). It features bus-hold on all data inputs, I_off and power-up 3-state for hot insertion, and supports unregulated battery operation down to 2.7 V. Used in backplane interface and legacy bus bridging applications where level translation and bus contention prevention are critical.

For engineers reviewing the SN74LVTH240GQNR datasheet, SN74LVTH240GQNR pinout, SN74LVTH240GQNR application, or SN74LVTH240GQNR equivalent, key selection criteria include its 20-pin VFBGA (GQN) package, ±100 µA I_off current at V_CC = 0 V, 64 mA I_OL drive strength, bus-hold functionality eliminating external resistors, and compliance with JESD 17 latch-up (>500 mA) and JESD 22 ESD standards (2000-V HBM).

Technical Context

This device integrates two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) control. The ABT logic family delivers TTL-compatible input thresholds and 3.3-V CMOS output swing while maintaining 5-V tolerant inputs - enabling direct interfacing between 3.3-V logic and legacy 5-V systems without external level shifters.

Its active bus-hold circuitry maintains valid logic states on unused inputs at ±750 µA hold current (V_CC = 3.6 V), and the I_off protection disables outputs during power-down to prevent backflow current. Propagation delays range from 0.9 ns to 4.6 ns (t_PLH/t_PHL) under CL = 50 pF, with enable/disable times as low as 1.0 ns (t_PZH).

Key Specifications

Pinout & Package

VFBGA-20 (GQN) package, 2.5 mm × 3.0 mm, 0.4 mm pitch, bottom-side ball array with exposed thermal pad. Pin 1 located at top-left corner (quadrant Q1) per JEDEC MO-220 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC240APWR and SN74ALVCH244RGYR, SN74LVTH240GQNR uniquely combines 5-V input tolerance, integrated bus-hold, and I_off-enabled hot insertion - making it irreplaceable in legacy-system upgrades and modular industrial hardware where signal integrity and robustness outweigh raw speed.

Availability

SN74LVTH240GQNR is available at Aetrix Electronics and suitable for industrial backplane interfaces, hot-swappable I/O modules, battery-powered data acquisition nodes, and legacy bus bridging applications requiring stable component supply across long production lifecycles.

Supply support for SN74LVTH240GQNR 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of experience in industrial, automotive, and communications ICs.

SN74LVTH240GQNR belongs to TI's ABT logic family, engineered specifically for mixed-voltage system interoperability - enabling seamless integration of modern low-voltage logic with legacy 5-V infrastructure in ruggedized equipment.

FAQ

What is the maximum input voltage rating for SN74LVTH240GQNR?

The SN74LVTH240GQNR supports input voltages up to 5.5 V across the full operating temperature range, independent of V_CC. This 5-V tolerance allows direct connection to legacy TTL or 5-V CMOS outputs without clamping diodes or level-shifting circuitry - a core feature confirmed in the Absolute Maximum Ratings table and Functional Description section of the datasheet.

Does SN74LVTH240GQNR require external pullup resistors on its inputs?

No, SN74LVTH240GQNR does not require external pullup or pulldown resistors on data inputs due to integrated bus-hold circuitry. Each input actively maintains its last-valid logic state with ±750 µA hold current (at V_CC = 3.6 V), as specified in the Electrical Characteristics table. Using external resistors with bus-hold is explicitly discouraged in the datasheet.

Can SN74LVTH240GQNR be used in hot-swap applications?

Yes, SN74LVTH240GQNR is explicitly designed for hot-insertion use via dual protection: I_off circuitry limits current to ±100 µA when V_CC = 0 V, and power-up 3-state forces outputs into high-impedance during power ramp-up. These features are validated per JESD 17 latch-up and JESD 22 ESD standards, and detailed in the "Support Hot Insertion" bullet of the datasheet's Feature Summary.

What is the thermal resistance (θ_JA) of the GQN package for SN74LVTH240GQNR?

The VFBGA-20 (GQN) package for SN74LVTH240GQNR has a junction-to-ambient thermal resistance (θ_JA) of 78°C/W, as published in the Absolute Maximum Ratings table. This value assumes standard JEDEC test board conditions (JESD 51-7) and is critical for calculating junction temperature rise under sustained 64 mA output loading.

How many independent buffer sections does SN74LVTH240GQNR contain?

SN74LVTH240GQNR contains two independent 4-bit noninverting buffer sections (totaling eight drivers), each with its own output-enable input (1OE and 2OE). This architecture is confirmed by the Functional Description, Logic Diagram, and Terminal Assignments - allowing separate control of high- and low-nibble data paths on shared buses.