Texas Instruments SN74LV244ADWE4

Overview

SN74LV244ADWE4 from Texas Instruments is an octal 3-state buffer/driver IC designed for bidirectional signal buffering in bus-oriented systems. It features dual 4-bit groups with independent output-enable (OE) controls, operates from 2 V to 5.5 V, delivers ≤6.5 ns propagation delay at 5 V, and supports mixed-mode voltage interfacing - used in server backplanes, LED display drivers, and telecom line-card data routing.

For engineers reviewing the SN74LV244ADWE4 datasheet, SN74LV244ADWE4 pinout, SN74LV244ADWE4 application, or SN74LV244ADWE4 equivalent, key selection criteria include its 20-pin SOIC (DW) package, 16-mA output drive capability, Ioff partial-power-down support, ±2000-V HBM ESD rating, and guaranteed operation across –40°C to +125°C industrial temperature range.

Technical Context

The SN74LV244ADWE4 implements two independent 4-bit noninverting buffer sections, each with dedicated active-low OE control enabling precise timing isolation of signal groups. Its balanced CMOS 3-state outputs provide symmetrical sourcing/sinking (±16 mA at 3.3 V), while standard CMOS inputs ensure high-impedance operation with <2.3 pF input capacitance and fast transition rate tolerance (≤20 ns/V at 5 V).

It incorporates Ioff circuitry to disable all outputs when VCC = 0 V, preventing backfeeding during partial power-down, and includes input/output clamp diodes rated for ±2000-V HBM and ±1000-V CDM ESD protection - critical for hot-swap-capable infrastructure equipment.

Key Specifications

Pinout & Package

SN74LV244ADWE4 uses a 20-pin SOIC (DW) package measuring 12.80 mm × 10.3 mm, with gull-wing leads and standard JEDEC MS-013 footprint. Thermal resistance RθJA = 102.3°C/W (JEDEC JESD51-2) supports operation without forced airflow in enclosed enclosures.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Compared with SN74LV244ADWE4, SN74LVC244APWR offers faster switching but lacks 5-V compatibility, while 74LVX244M provides pin-compatible SOIC packaging but sacrifices 25% output current and 1 ns of speed - making SN74LV244ADWE4 optimal for mixed-voltage, high-drive industrial bus applications.

Availability

SN74LV244ADWE4 is available at Aetrix Electronics and suitable for server backplanes, LED display drivers, and telecom infrastructure requiring stable component supply across extended temperature and voltage ranges.

Supply support for SN74LV244ADWE4 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 logic solutions for industrial, automotive, and communications markets.

The SN74LV244ADWE4 belongs to TI's LV logic family - engineered for high-speed, low-voltage operation with robust noise immunity and mixed-voltage interoperability in infrastructure and control systems.

FAQ

What is the maximum capacitive load SN74LV244ADWE4 can drive while maintaining specified timing?

The SN74LV244ADWE4 is characterized for loads up to 50 pF across all VCC conditions (2–5.5 V). At 5 V, it achieves ≤6.5 ns propagation delay with 50-pF load; exceeding this capacitance increases tpd nonlinearly and may violate setup/hold margins in synchronous interfaces. For loads >50 pF, derating curves in Section 6.10 of the datasheet must be consulted, and series termination or buffer staging is recommended.

Does SN74LV244ADWE4 support hot-swap operation, and how is it implemented?

Yes, SN74LV244ADWE4 supports hot-swap via its Ioff feature: when VCC = 0 V, all outputs enter high-impedance state with ≤5 µA leakage, preventing backfeeding into live backplanes. To implement, tie 1OE and 2OE to system VCC through ≥10-kΩ pullup resistors so outputs remain disabled until main supply stabilizes - verified per JESD78 latch-up testing (>250 mA).

Can SN74LV244ADWE4 interface between 1.8-V and 3.3-V logic domains?

SN74LV244ADWE4 accepts 1.8-V inputs only when VCC ≥ 2.3 V (VIH(min) = 0.7×VCC). At VCC = 2.5 V, VIH(min) = 1.75 V - compatible with 1.8-V logic HIGH. However, output VOH will be ~2.4 V, requiring a receiver with VIH ≤ 2.4 V. For reliable 1.8-V ↔ 3.3-V translation, pair SN74LV244ADWE4 with a dedicated level shifter on the return path.

What is the thermal performance of SN74LV244ADWE4 in its SOIC (DW) package?

SN74LV244ADWE4 in the DW package has RθJA = 102.3°C/W (JEDEC JESD51-2), RθJC(top) = 69.9°C/W, and RθJB = 70.8°C/W. At 100-mW dissipation (typical worst-case), junction temperature rise is ~10.2°C above ambient - well within the 125°C max rating even at 85°C ambient. No heatsink is required for standard industrial use.

How should unused inputs and outputs be terminated on SN74LV244ADWE4?

All unused inputs on SN74LV244ADWE4 must be tied to VCC or GND - floating CMOS inputs cause oscillation and excess current. Unused outputs may be left unconnected (high-Z state), but must never be shorted to VCC or GND. For unused 1A1–1A4 or 2A1–2A4 pins, a 10-kΩ pullup/down resistor is recommended; OE pins should be pulled high to disable respective output groups by default.