Texas Instruments SN74LVT244BDWG4

Overview

SN74LVT244BDWG4 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 dual 4-bit drivers with independent output-enable (OE) controls, supports hot insertion via I_off and power-up 3-state, and operates down to 2.7 V for unregulated battery systems.

For engineers reviewing the SN74LVT244BDWG4 datasheet, SN74LVT244BDWG4 pinout, SN74LVT244BDWG4 application, or SN74LVT244BDWG4 equivalent, key selection considerations include its 20-pin SOIC-DW package, 3.3-V supply compatibility with 5-V TTL interfacing, low ground bounce (<0.8 V), and JESD 78 Class II latch-up performance.

Technical Context

This device implements two independent 4-bit noninverting buffer sections, each controlled by a dedicated OE input (1OE and 2OE). When OE is low, data passes from A inputs to Y outputs; when high, outputs enter high-impedance state. The ABT logic family ensures fast switching with t_PLH/t_PHL ≤ 3.5 ns at V_CC = 3.3 V and CL = 50 pF.

It integrates I_off circuitry to block current backflow during power-down and power-up 3-state logic to prevent bus contention. Input voltage tolerance extends to 5.5 V, enabling direct connection to legacy 5-V logic without level shifters.

Key Specifications

Pinout & Package

SN74LVT244BDWG4 uses a 20-pin SOIC (DW) package with 7.5 mm × 12.8 mm body, 1.27 mm pitch, and 2.65 mm max height per JEDEC MS-013. Pin 1 index area located at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVTH244ADW and 74ALVC244PW, the SN74LVT244BDWG4 uniquely combines 5-V-tolerant inputs, hot-insertion support, and 64-mA output drive-making it the only choice for mixed-voltage industrial backplanes requiring field-replaceable modules.

Availability

SN74LVT244BDWG4 is available at Aetrix Electronics and suitable for industrial control systems, programmable logic controllers, and legacy-to-modern interface modules requiring stable component supply and long-term manufacturability.

Supply support for SN74LVT244BDWG4 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 over 90 years of innovation in industrial, automotive, and communications markets.

The SN74LVT244BDWG4 belongs to TI's ABT logic family, engineered for high-speed, mixed-voltage buffering in mission-critical industrial and telecom infrastructure where reliability, voltage interoperability, and hot-swap capability are mandatory.

FAQ

What is the maximum input voltage allowed on SN74LVT244BDWG4 inputs?

The SN74LVT244BDWG4 supports input voltages up to 5.5 V regardless of V_CC level, enabling direct interfacing with 5-V TTL outputs without external clamping or level-shifting circuitry. This specification is guaranteed across the full operating temperature range (−40°C to +85°C) and is explicitly defined in the Absolute Maximum Ratings table of the official datasheet SCAS354J.

Does SN74LVT244BDWG4 support hot-plug operation?

Yes, the SN74LVT244BDWG4 supports hot insertion through integrated I_off circuitry and power-up 3-state functionality. When V_CC = 0 V, I_off limits current to ±100 μA, preventing backflow damage. During power ramp-up, outputs remain in high-impedance until V_CC stabilizes - both features are verified per JESD 78 Class II and documented in the Functional Description section of SCAS354J.

What is the recommended decoupling for SN74LVT244BDWG4?

A minimum 0.1-μF ceramic capacitor placed as close as possible to the V_CC (pin 20) and GND (pin 10) pins is required for stable operation. For systems with high-frequency switching or multiple devices, add a bulk 4.7-μF tantalum or aluminum electrolytic capacitor near the power entry point. These values are specified in TI's application guidance for ABT logic and validated in layout examples for SOIC packages.

Can SN74LVT244BDWG4 be used with a 2.5-V supply?

No - the SN74LVT244BDWG4 has a minimum V_CC of 2.7 V per Recommended Operating Conditions. Operation below 2.7 V violates specifications and may result in undefined output states, increased propagation delay, or failure to meet VIH/VIL thresholds. For 2.5-V systems, consider the SN74LVC244A or SN74ALVC244A families instead.

What is the thermal resistance (θ_JA) of SN74LVT244BDWG4 in its SOIC-DW package?

The SN74LVT244BDWG4 in the SOIC-DW package has a junction-to-ambient thermal resistance (θ_JA) of 58°C/W, measured under standard JEDEC JESD 51-7 conditions with 1 in² copper pad. This value assumes standard 2-layer PCB layout with no internal planes; actual thermal performance improves with additional copper area or thermal vias beneath the exposed leads.