Texas Instruments SN74LVTH240PW

Overview

SN74LVTH240PW from Texas Instruments is a 3.3-V ABT octal buffer/driver with 3-state outputs, designed for mixed-mode signal operation between 5-V inputs and 3.3-V V_CC. It features bus-hold on all data inputs, I_off support for hot insertion, and operates down to 2.7 V. Used in backplane interface, memory address buffering, and bus isolation in industrial control systems.

For engineers reviewing the SN74LVTH240PW datasheet, SN74LVTH240PW pinout, SN74LVTH240PW application, or SN74LVTH240PW equivalent, key selection criteria include its 20-pin TSSOP package, dual 4-bit channel architecture with independent OE controls, ±100 µA I_off specification, bus-hold current range (±750 µA), and 3.3-V supply compatibility with 5-V tolerant inputs.

Technical Context

This device implements two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) inputs controlling high-impedance states. The ABT (Advanced BiCMOS Technology) architecture enables TTL-level input compatibility while operating at 3.3-V V_CC, supporting mixed-voltage system interfacing without level shifters.

Bus-hold circuitry actively maintains valid logic states on undriven inputs, eliminating external pullup/pulldown resistors. I_off and power-up 3-state functionality prevent current backflow and driver conflicts during hot insertion or power sequencing, meeting JESD 17 latch-up (>500 mA) and JESD 22 ESD (2000-V HBM, 200-V MM) requirements.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.5 mm × 4.4 mm, 0.65 mm pitch, 1.2 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC240APW and SN74AHCT240PW, the SN74LVTH240PW uniquely combines 5-V input tolerance, bus-hold, and 3.3-V operation-enabling drop-in replacement in mixed-voltage backplanes without redesigning bias networks or sacrificing drive capability.

Availability

SN74LVTH240PW is available at Aetrix Electronics and suitable for industrial control, telecommunications infrastructure, and embedded instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74LVTH240PW 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The SN74LVTH240PW belongs to TI's ABT logic family, engineered for high-speed, mixed-voltage bus interfacing in mission-critical systems where reliability, hot-swap capability, and signal integrity are essential.

FAQ

What is the maximum input voltage rating for SN74LVTH240PW?

The SN74LVTH240PW supports input voltages from −0.5 V to 7 V, enabling safe interfacing with 5-V logic while operating from a 3.3-V supply. This eliminates external level-shifting components in mixed-voltage systems and ensures robustness against transient overvoltage events on data lines.

Does SN74LVTH240PW require external pullup resistors on its inputs?

No, SN74LVTH240PW includes active bus-hold circuitry on all eight data inputs, maintaining valid logic states without external pullup or pulldown resistors. This reduces BOM count, saves PCB space, and improves reliability in systems with unterminated or intermittently connected buses.

Can SN74LVTH240PW be used in hot-swap applications?

Yes, SN74LVTH240PW incorporates I_off and power-up 3-state features specifically for hot-insertion. When V_CC is off, I_off limits current to ±100 µA, preventing backflow; power-up 3-state ensures outputs remain high-impedance until supply stabilizes, avoiding bus conflicts during insertion.

What is the thermal resistance (θ_JA) of the SN74LVTH240PW package?

The SN74LVTH240PW in its TSSOP-20 (PW) package has a junction-to-ambient thermal resistance of 83°C/W, measured per JESD 51-7 under standard JEDEC test conditions. This value guides thermal design for continuous operation at rated current and ambient temperatures up to 85°C.

How does the dual OE architecture of SN74LVTH240PW improve system flexibility?

The SN74LVTH240PW provides two independent output-enable inputs (1OE and 2OE), allowing separate control of its two 4-bit buffer sections. This enables selective bus partitioning, staggered enable sequencing, and dynamic reconfiguration of signal paths-critical for fault-isolated industrial I/O and multi-module backplane architectures.