Texas Instruments SN74LVT244BDBRE4

Overview

SN74LVT244BDBRE4 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 TTL 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 - used in backplane interface and bus isolation in industrial control modules.

For engineers reviewing the SN74LVT244BDBRE4 datasheet, SN74LVT244BDBRE4 pinout, SN74LVT244BDBRE4 application, or SN74LVT244BDBRE4 equivalent, key selection criteria include 3.3-V supply compatibility with 5-V input tolerance, output ground bounce <0.8 V at 3.3 V, latch-up immunity >100 mA per JESD 78 Class II, and thermal resistance of 58°C/W in SOIC-DW package.

Technical Context

This device implements two independent 4-bit noninverting buffers, 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 (t_PLH/t_PHL ≤ 3.5 ns at V_CC = 3.3 V, C_L = 50 pF) and robust noise immunity.

It integrates I_off circuitry to disable outputs during power-down, preventing backflow current, and power-up 3-state logic to hold outputs high-Z during V_CC ramp-up. Input voltage range extends to 7 V, enabling direct interfacing with legacy 5-V logic without level shifters.

Key Specifications

Pinout & Package

SN74LVT244BDBRE4 is packaged in a 20-pin SOIC (DW) with 0.300-inch body width and 1.27-mm lead pitch. Pin 1 is located at the top-left corner with index marking, and the package conforms to JEDEC MS-013.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVT244BDBRE4, SN74LVTH244A offers lower cost but sacrifices hot-insertion safety and drive strength, while 74ALVC244 eliminates 5-V input tolerance - making SN74LVT244BDBRE4 uniquely suited for legacy-compatible, high-reliability industrial bus isolation.

Availability

SN74LVT244BDBRE4 is available at Aetrix Electronics and suitable for industrial control systems, automated test equipment, and embedded instrumentation requiring stable component supply with full lifecycle support and traceable sourcing.

Supply support for SN74LVT244BDBRE4 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 logic solutions for industrial, automotive, and communications markets.

The SN74LVT244BDBRE4 belongs to TI's ABT logic family, engineered for high-speed, mixed-voltage bus interface in mission-critical industrial systems where reliability, hot-swap capability, and 5-V/3.3-V interoperability are essential.

FAQ

What is the maximum operating temperature for SN74LVT244BDBRE4?

The SN74LVT244BDBRE4 is rated for operation from −40°C to +85°C ambient temperature. This industrial-grade temperature range ensures reliable performance in factory automation, motor control, and outdoor instrumentation environments where thermal extremes are common. The SOIC-DW package's θ_JA of 58°C/W allows sustained operation at full load within this range when PCB thermal design meets recommended guidelines.

Does SN74LVT244BDBRE4 support hot insertion into live backplanes?

Yes, SN74LVT244BDBRE4 supports hot insertion via integrated I_off circuitry and power-up 3-state logic. When V_CC is 0 V, I_off limits current to ±100 μA, preventing damaging backflow. During power-up, outputs remain in high-impedance state until V_CC stabilizes - both features are explicitly validated per JESD 78 Class II latch-up testing and documented in TI's SCAS354J datasheet.

Can SN74LVT244BDBRE4 interface directly with 5-V TTL logic?

Yes, SN74LVT244BDBRE4 accepts input voltages up to 7 V while operating from a 3.3-V supply, enabling direct connection to 5-V TTL outputs without external level shifters. Its VIH threshold is 2 V and VIL is 0.8 V, fully compatible with TTL logic levels. This mixed-mode capability is a core design feature confirmed in the "Supports Mixed-Mode Signal Operation" section of the datasheet.

What is the output ground bounce (VOLP) specification for SN74LVT244BDBRE4?

SN74LVT244BDBRE4 specifies typical output ground bounce (V_OLP) of <0.8 V at V_CC = 3.3 V and T_A = 25°C. This parameter is measured under worst-case simultaneous switching conditions and ensures signal integrity on shared ground planes in high-density PCB layouts - critical for maintaining noise margins in industrial bus applications.

Is SN74LVT244BDBRE4 RoHS compliant and lead-free?

Yes, SN74LVT244BDBRE4 is RoHS compliant and features NiPdAu (NIPDAU) lead finish. Per TI's packaging addendum, it carries MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH) and is qualified for peak reflow temperatures up to 260°C. The "E4" suffix denotes TI's green packaging standard, confirming compliance with EU RoHS Directive 2011/65/EU and JEDEC J-STD-020.