Texas Instruments SN74LVTH244ADW

Overview

SN74LVTH244ADW 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 industrial backplane interfaces and legacy TTL-to-3.3-V level translation.

For engineers reviewing the SN74LVTH244ADW datasheet, SN74LVTH244ADW pinout, SN74LVTH244ADW application, or SN74LVTH244ADW equivalent, key selection criteria include its 20-pin SOIC-DW package, ±100 µA I_off current at V_CC = 0 V, 0.55 V max V_OL at I_OL = 64 mA, and 3.8 ns typical t_PLH/t_PHL propagation delay at V_CC = 3.3 V.

Technical Context

This device implements two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) control-1OE for Y1–Y4 and 2OE for Y5–Y8. The ABT (Advanced BiCMOS Technology) architecture enables TTL-compatible input thresholds while operating from a 3.3-V supply, allowing direct interfacing between 5-V legacy systems and 3.3-V logic domains.

Active bus-hold circuitry maintains valid logic levels on floating data inputs without external resistors, and the I_off protection disables outputs during power-down to prevent backflow current. Power-up 3-state ensures high-impedance outputs during V_CC ramp-up, eliminating bus contention in hot-swap applications.

Key Specifications

Pinout & Package

SN74LVTH244ADW is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 1.75 mm height, with 0.65 mm lead pitch and NiPdAu lead finish. RoHS-compliant, MSL Level-1, 260°C peak reflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC244APWR and SN74AHCT244N, SN74LVTH244ADW uniquely delivers mixed-voltage interoperability, integrated bus-hold, and certified hot-insertion capability - making it the sole option for upgrading 5-V industrial backplanes to 3.3-V controllers without compromising reliability or layout simplicity.

Availability

SN74LVTH244ADW is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system voltage translation, and hot-swappable module carriers requiring stable component supply across extended product lifecycles.

Supply support for SN74LVTH244ADW 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 SN74LVTH244ADW belongs to TI's ABT logic family, engineered specifically for robust 3.3-V operation with backward compatibility to 5-V TTL systems - targeting industrial control, test equipment, and infrastructure upgrades.

FAQ

What is the maximum output sink current supported by the SN74LVTH244ADW?

The SN74LVTH244ADW supports a maximum low-level output current (I_OL) of 64 mA per output, specified at V_CC = 3.3 V and T_A = 25°C. This rating ensures reliable driving of standard TTL loads and multiple CMOS inputs without derating in typical industrial ambient conditions. The SN74LVTH244ADW maintains this performance across its full 2.7–3.6 V V_CC range.

Does the SN74LVTH244ADW require external pullup resistors on its data inputs?

No, the SN74LVTH244ADW does not require external pullup or pulldown resistors on its data inputs because it integrates active bus-hold circuitry. This feature maintains valid logic states on unused or floating inputs, eliminating BOM components and layout overhead. Using external resistors with the SN74LVTH244ADW's bus-hold is explicitly discouraged in the datasheet.

Can the SN74LVTH244ADW be used in hot-insertion applications?

Yes, the SN74LVTH244ADW is fully specified for hot-insertion applications using both I_off and power-up 3-state technologies. Its I_off circuitry disables outputs when V_CC = 0 V, preventing damaging current backflow, while power-up 3-state guarantees high-impedance outputs during power ramp-up. These features make the SN74LVTH244ADW suitable for live backplane and modular carrier systems.

What is the thermal resistance (θ_JA) of the SN74LVTH244ADW in its SOIC-DW package?

The SN74LVTH244ADW in the SOIC-DW package has a junction-to-ambient thermal resistance (θ_JA) of 58 °C/W, measured per JESD 51-7. This value assumes standard JEDEC high-K test board conditions and enables thermal design for continuous operation at full output drive (64 mA) in ambient temperatures up to 85°C without forced airflow.

How does the SN74LVTH244ADW handle 5-V input signals while operating from a 3.3-V supply?

The SN74LVTH244ADW supports 5-V input signals with a 3.3-V V_CC supply due to its ABT process design, which extends input voltage tolerance to 5.5 V. Its VIH threshold remains at 2.0 V and VIL at 0.8 V, ensuring TTL-compatible recognition of 5-V logic levels without clamping diodes or external protection. This mixed-mode capability is intrinsic to the SN74LVTH244ADW and requires no configuration.