Texas Instruments SN74LVTH245ADWR

Overview

SN74LVTH245ADWR from Texas Instruments is a 3.3-V ABT octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between 3.3-V and 5-V buses. It features bus-hold circuitry on all A/B data inputs, Ioff support for hot insertion, and operates across −40°C to 85°C with VCC down to 2.7 V. Used in mixed-voltage backplane interfaces and legacy system upgrades.

For engineers reviewing the SN74LVTH245ADWR datasheet, SN74LVTH245ADWR pinout, SN74LVTH245ADWR application, or SN74LVTH245ADWR equivalent, key selection criteria include its 3.3-V supply compatibility with 5-V tolerant I/O, 20-pin SOIC-DW package thermal performance (θJA = 58°C/W), bus-hold input retention, and guaranteed 3-state isolation during power sequencing.

Technical Context

The SN74LVTH245ADWR implements an ABT (Advanced BiCMOS Technology) logic architecture enabling TTL-level signal translation while operating at 3.3-V VCC. Its DIR input controls direction (A→B or B→A), and OE enables/disables both bus sides simultaneously into high-impedance states.

It integrates active bus-hold circuitry on all eight A and eight B data lines-eliminating external pull resistors-and uses Ioff and power-up 3-state logic to prevent current backflow and driver conflict during hot insertion or uncontrolled power ramping.

Key Specifications

Pinout & Package

SN74LVTH245ADWR is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 2.65 mm max height, with 1.27 mm lead pitch and gull-wing leads. RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus transceiver applications.

Compared with SN74LVC245A and SN74ALVCH16245, the SN74LVTH245ADWR uniquely combines 5-V-tolerant I/O, integrated bus-hold, and Ioff-enabled hot insertion in a standard 20-pin SOIC - making it irreplaceable in mixed-voltage upgrade paths and field-serviceable systems.

Availability

SN74LVTH245ADWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system voltage translation, hot-swappable module carriers, and automated test equipment signal routing requiring stable component supply and long-term lifecycle assurance.

Supply support for SN74LVTH245ADWR 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 SN74LVTH245ADWR belongs to TI's 3.3-V ABT logic family, engineered specifically for seamless interoperability between emerging low-voltage digital systems and legacy 5-V infrastructure.

FAQ

What is the maximum recommended operating temperature for SN74LVTH245ADWR?

The SN74LVTH245ADWR is rated for operation from −40°C to +85°C ambient temperature. This industrial-grade range ensures reliable performance in factory automation controllers, outdoor telecom equipment, and motor drive interfaces where thermal cycling and extended temperature exposure occur. The SOIC-DW package's θJA of 58°C/W allows sustained output loading within this envelope when PCB copper area meets TI's layout guidelines.

Does SN74LVTH245ADWR require external pullup resistors on its data lines?

No, SN74LVTH245ADWR does not require external pullup or pulldown resistors on its A1–A8 or B1–B8 data lines due to integrated bus-hold circuitry. This feature actively maintains the last-valid logic state on unused or floating inputs, eliminating board space, BOM cost, and potential signal integrity issues associated with discrete biasing. Using external resistors with enabled bus-hold is explicitly discouraged in the datasheet.

Can SN74LVTH245ADWR safely interface a 3.3-V microcontroller with a 5-V LCD display module?

Yes, SN74LVTH245ADWR can safely interface a 3.3-V microcontroller with a 5-V LCD display module. Its inputs tolerate up to 7 V, and outputs drive 5-V TTL loads with 64-mA sink capability at VCC = 3 V. When configured with DIR set to route MCU outputs to the display (A→B), and OE asserted low, the device provides level-shifted, noise-immune data transfer without additional components or voltage translators.

What is the purpose of the OE pin on SN74LVTH245ADWR, and how should it be connected during power-up?

The OE (output enable) pin on SN74LVTH245ADWR controls 3-state isolation of both A and B buses. To ensure high-impedance state during power-up or power-down, OE must be tied to VCC through a pullup resistor; TI specifies minimum resistance based on driver sink capability. This prevents bus contention before system firmware initializes DIR and OE, and leverages the device's built-in power-up 3-state circuitry for fail-safe behavior independent of software control.

Is SN74LVTH245ADWR pin-compatible with other packages in the same family, such as SN74LVTH245APWR?

SN74LVTH245ADWR (SOIC-DW) and SN74LVTH245APWR (TSSOP-PW) share identical 20-pin functional pinouts and logic behavior, but differ in physical dimensions, thermal characteristics (θJA = 58°C/W vs. 83°C/W), and soldering profiles (MSL Level-1 vs. Level-1). They are functionally interchangeable in schematic design, though PCB footprint and thermal management must be verified per package. No electrical or timing differences exist between these variants beyond package-related parasitics.