Texas Instruments SN74LVTR245DWR

Overview

SN74LVTR245DWR 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 inputs, direction control (DIR), output enable (OE), and A-port undershoot suppression - supporting mixed-mode TTL interfacing in industrial embedded systems.

For engineers reviewing the SN74LVTR245DWR datasheet, SN74LVTR245DWR pinout, SN74LVTR245DWR application, or SN74LVTR245DWR equivalent, key selection criteria include 3.3-V VCC operation with 5-V tolerant I/O, ±64 mA B-port drive capability, –40°C to 85°C temperature range, and DB package footprint compatibility with legacy SOIC layouts.

Technical Context

The SN74LVTR245DWR implements an Advanced BiCMOS Technology (ABT) architecture optimized for low-static power at 3.3-V supply while maintaining robust 5-V signal tolerance on all I/O pins. Its dual-bus topology supports real-time direction reversal via DIR input, with OE enabling full 3-state isolation of both A and B ports.

Bus-hold circuitry actively maintains valid logic levels on floating A/B data inputs without external pullups, and the A port's reduced-output structure limits VOHV and ground bounce (VOLP < 0.8 V at VCC = 3.3 V). Propagation delays are specified down to 1.1 ns (tPLH, A→B) under 3.3-V conditions with CL = 50 pF.

Key Specifications

Pinout & Package

SN74LVTR245DWR is housed in a 20-pin Shrink Small-Outline (DB) package (5.3 mm × 6.2 mm, 0.65 mm pitch), offering 47% smaller PCB area than standard SOIC-20 while retaining identical pin count and layout compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVTR245DWR, SN74LVC245A lacks bus-hold and 5-V tolerance - increasing design complexity in mixed-voltage systems - while SN74ALVC245 trades 5-V interoperability for raw speed, requiring additional protection circuitry for legacy interface use cases.

Availability

SN74LVTR245DWR is available at Aetrix Electronics and suitable for industrial automation, test equipment, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVTR245DWR 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74LVTR245DWR belongs to TI's ABT logic family, engineered specifically for robust 3.3-V operation with 5-V signal compatibility in mixed-voltage digital systems - targeting industrial control, instrumentation, and legacy interface bridging.

FAQ

What is the maximum operating voltage for SN74LVTR245DWR?

The SN74LVTR245DWR has an absolute maximum supply voltage (VCC) rating of 4.6 V, but its recommended operating range is 2.7 V to 3.6 V. Exceeding 3.6 V may cause parametric degradation or reliability issues, even if within absolute max limits. The device is rated for 5.5-V input tolerance on all I/O pins, making it safe for direct connection to 5-V logic sources when VCC = 3.3 V.

Does SN74LVTR245DWR support hot insertion or live swapping?

Yes, SN74LVTR245DWR supports live insertion due to its bus-hold inputs and high-impedance 3-state outputs. When OE is held HIGH during power-up or removal, both A and B ports remain isolated, preventing signal contention. Its latch-up immunity (>500 mA per JESD-17) and input clamp current rating (–50 mA) further ensure robustness during hot-swap events in modular backplane systems.

How does the bus-hold feature work on SN74LVTR245DWR?

The SN74LVTR245DWR integrates active bus-hold circuitry on all A and B data inputs, which detects and latches the last-valid logic state (HIGH or LOW) when an input floats. This eliminates the need for external 10-kΩ pullup/pulldown resistors, reducing board space and BOM cost. Bus-hold current is ±75 µA at VI = 0.8 V or 2.0 V, ensuring stable retention without loading driven signals.

Can SN74LVTR245DWR be used to interface between 3.3-V and 5-V microcontrollers?

Yes, SN74LVTR245DWR is explicitly designed for this purpose: its 5-V tolerant I/O pins accept and drive 5-V signals while operating from a 3.3-V supply. The device supports bidirectional data flow controlled by DIR, and full isolation via OE - enabling seamless communication between 3.3-V ARM or RISC-V cores and legacy 5-V 8051 or PIC microcontrollers without external level-shifting components.

What is the thermal performance of SN74LVTR245DWR in the DB package?

In the DB (Shrink Small-Outline) package, SN74LVTR245DWR has a maximum power dissipation of 0.65 W at TA = 55°C in still air. Its low ICC (0.13–0.19 mA in 3-state mode) and ABT process minimize self-heating, allowing reliable operation up to +85°C ambient without forced airflow. Thermal resistance (θJA) is approximately 115°C/W, consistent with industry-standard DB-package logic devices.