Texas Instruments SN74LVTH244ADBRG4

Overview

SN74LVTH244ADBRG4 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 3.3-V system interfacing with legacy 5-V buses, such as industrial control backplanes and embedded data acquisition modules.

For engineers reviewing the SN74LVTH244ADBRG4 datasheet, SN74LVTH244ADBRG4 pinout, SN74LVTH244ADBRG4 application, or SN74LVTH244ADBRG4 equivalent, key selection criteria include its 20-pin SSOP package, ±100 µA I_off current at V_CC = 0 V, 2.7–3.6 V operating range, bus-hold input retention, and guaranteed 32 mA low-level output drive at V_CC = 3 V.

Technical Context

The SN74LVTH244ADBRG4 implements two independent 4-bit noninverting buffer sections, each with dedicated output-enable (OE) control. Its ABT (Advanced BiCMOS Technology) architecture delivers TTL-compatible input thresholds and 3.3-V CMOS output levels while maintaining robust noise immunity and low ground bounce (V_OLP < 0.8 V).

Bus-hold circuitry actively maintains valid logic states on floating or unused A-inputs without external resistors, and the I_off protection disables outputs during power-down to prevent backflow current. Power-up 3-state ensures outputs remain high-impedance until V_CC stabilizes, eliminating bus contention during sequencing.

Key Specifications

Pinout & Package

SN74LVTH244ADBRG4 is housed in a 20-pin SSOP (Shrink Small Outline Package), 0.65 mm pitch, 7.4 mm × 5.3 mm body, 2.0 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 SN74LVC244APWR and SN74AHCT244N, the SN74LVTH244ADBRG4 uniquely combines 5-V-tolerant I/O, integrated bus-hold, and I_off-enabled hot insertion-making it the sole option among the three for robust 3.3/5-V bridging in field-replaceable modules.

Availability

SN74LVTH244ADBRG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, embedded data acquisition systems, automated test equipment fixtures, and programmable logic controller I/O modules requiring stable component supply across extended product lifecycles.

Supply support for SN74LVTH244ADBRG4 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 SN74LVTH244A family was engineered for mixed-voltage system interfacing-specifically enabling 3.3-V logic to safely communicate with 5-V buses while supporting hot-plug infrastructure in modular electronics.

FAQ

What is the maximum recommended operating temperature for SN74LVTH244ADBRG4?

The SN74LVTH244ADBRG4 is rated for operation from −40°C to +85°C ambient temperature. This industrial temperature range ensures reliable performance in factory automation controllers, outdoor instrumentation, and power supply monitoring modules where thermal cycling and enclosure heating occur.

Does SN74LVTH244ADBRG4 require external pullup resistors on its inputs?

No. The SN74LVTH244ADBRG4 integrates active bus-hold circuitry on all eight data inputs, which maintains valid logic states without external pullup or pulldown resistors. Using external resistors with bus-hold enabled is explicitly discouraged in the datasheet due to potential contention and increased power draw.

Can SN74LVTH244ADBRG4 be used in hot-swap applications?

Yes. The SN74LVTH244ADBRG4 supports hot insertion via dual mechanisms: I_off circuitry disables outputs when V_CC = 0 V, preventing backdrive current, and power-up 3-state holds outputs in high-impedance until V_CC reaches valid operating voltage-both confirmed in the SCAS586J datasheet.

What is the pin 1 marking and orientation for SN74LVTH244ADBRG4?

SN74LVTH244ADBRG4 uses standard SSOP pin 1 identification: a small circular or rectangular index mark adjacent to pin 1, located at the top-left corner of the package when the marking text is upright. Tape-and-reel packaging follows quadrant Q1 orientation per TI's DB0020A package drawing.

How does the bus-hold feature behave during power-down of SN74LVTH244ADBRG4?

During power-down, the bus-hold circuitry in SN74LVTH244ADBRG4 remains functional as long as V_CC is above ~1.5 V. Below that threshold, bus-hold deactivates but I_off ensures outputs are disabled, preventing unintended loading of the bus. This staged behavior is documented in the "Electrical Characteristics" table under II(hold) and I_off parameters.