Texas Instruments SN74LVTH244ANS

Overview

SN74LVTH244ANS from Texas Instruments is a 3.3-V ABT octal buffer/driver with 3-state outputs, designed for mixed-mode signal interfacing between 3.3-V logic and 5-V systems. It features bus-hold on all data inputs, Ioff support for hot insertion, and operates down to 2.7 V supply. Used in industrial backplane drivers, memory address buffers, and FPGA I/O expansion interfaces.

For engineers reviewing the SN74LVTH244ANS datasheet, SN74LVTH244ANS pinout, SN74LVTH244ANS application, or SN74LVTH244ANS equivalent, key selection criteria include its 20-pin SOP-NS package, 3.3-V VCC with 5-V tolerant inputs, ±64 mA output drive capability, bus-hold circuitry eliminating external resistors, and guaranteed operation from −40°C to +85°C.

Technical Context

The SN74LVTH244ANS implements two independent 4-bit noninverting buffer sections, each controlled by a dedicated output-enable (OE) input. Its ABT (Advanced BiCMOS Technology) architecture delivers TTL-compatible output levels while operating from a 3.3-V supply.

Input clamping supports 5-V-tolerant operation without damage, and the integrated bus-hold circuit maintains valid logic states on floating inputs at ±750 µA hold current. Power-up 3-state and Ioff protection ensure safe hot-plug operation in live backplanes and modular systems.

Key Specifications

Pinout & Package

The SN74LVTH244ANS uses a 20-pin SOP (Small Outline Package) with NS suffix, measuring 7.5 mm × 5.6 mm × 2.0 mm max height per JEDEC MO-150. Pin 1 is marked by a notch or beveled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC244APWR and SN74AHCT244N, the SN74LVTH244ANS uniquely combines 5-V input tolerance, bus-hold, Ioff, and industrial temperature range in a single SOP-NS package-making it the only drop-in solution for mixed-voltage hot-plug backplane interfaces.

Availability

SN74LVTH244ANS is available at Aetrix Electronics and suitable for industrial automation, embedded controller design, and FPGA-based system integration requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVTH244ANS 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 SN74LVTH244ANS belongs to TI's ABT logic family, engineered specifically for robust mixed-voltage interfacing in industrial backplanes, programmable logic I/O expansion, and memory subsystems where reliability under voltage transients and hot-swap events is critical.

FAQ

What is the maximum input voltage rating for SN74LVTH244ANS?

The SN74LVTH244ANS supports input voltages up to 5.5 V regardless of VCC state, enabling direct interfacing with 5-V TTL logic without external level-shifting circuitry. This 5-V tolerance is guaranteed across the full operating temperature range and is validated per absolute maximum ratings in the official datasheet SCAS586J.

Does SN74LVTH244ANS require external pullup resistors on its data inputs?

No, the SN74LVTH244ANS integrates active bus-hold circuitry on all eight data inputs, maintaining valid logic states on floating lines without external pullup or pulldown resistors. Using external resistors with enabled bus-hold is explicitly discouraged in the datasheet due to potential conflict and increased power consumption.

Can SN74LVTH244ANS be used in hot-swap applications?

Yes, the SN74LVTH244ANS is fully specified for hot-insertion use via dual protection mechanisms: Ioff circuitry disables outputs when VCC = 0 V to prevent damaging back-current, and power-up 3-state ensures outputs remain high-impedance during power ramp-up-both confirmed in the functional description and absolute maximum ratings of SCAS586J.

What is the thermal resistance (θJA) of the SN74LVTH244ANS SOP-NS package?

The SN74LVTH244ANS in the SOP-NS package has a junction-to-ambient thermal resistance (θJA) of 60°C/W, as documented in the "Absolute Maximum Ratings" section of the SCAS586J datasheet. This value assumes standard JEDEC test board conditions and informs thermal design for continuous operation at rated load.

How many independent output-enable controls does SN74LVTH244ANS provide?

The SN74LVTH244ANS provides two independent active-low output-enable inputs: 1OE controls Y1–Y4 outputs, and 2OE controls Y1–Y4 outputs of the second 4-bit section. This allows selective disabling of either half of the octal buffer set, enabling flexible bus segmentation in multi-peripheral systems.