Texas Instruments SN74ABT2245DWR

Overview

SN74ABT2245DWR from Texas Instruments is an octal transceiver and line driver with 3-state outputs, designed for asynchronous bidirectional data bus communication between A- and B-buses. It features direction control (DIR), output enable (OE), B-port 25-Ω series termination, and operates from 4.5 V to 5.5 V across –40°C to 85°C. Used in industrial backplane interfaces and legacy bus isolation.

For engineers reviewing the SN74ABT2245DWR datasheet, SN74ABT2245DWR pinout, SN74ABT2245DWR application, or SN74ABT2245DWR equivalent, key selection criteria include 20-pin SOIC (DW) package compatibility, 3.4 ns max A→B propagation delay at 5 V, B-port 12 mA sink capability with integrated series resistance, and high-impedance state during power-up/down.

Technical Context

This device implements a dual-bus transceiver architecture with independent DIR and OE controls enabling configurable data flow direction (A↔B) and per-channel 3-state output isolation. The B-port outputs integrate 25-Ω series resistors to suppress overshoot/undershoot without external components.

It uses EPIC-II^B BiCMOS technology to achieve low power dissipation while maintaining TTL-compatible input thresholds (V_IL = 0.8 V, V_IH = 2.0 V) and robust latch-up immunity (>500 mA per JESD-17). Power sequencing behavior ensures high-impedance state when V_CC is below 2.1 V.

Key Specifications

Pinout & Package

SN74ABT2245DWR is housed in a 20-pin SOIC (DW) package with 1.27 mm lead pitch, 7.5 mm body width, and 2.65 mm maximum height. Pin 1 index is marked by a beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2245APW and SN74ABT245N, the SN74ABT2245DWR uniquely combines 5-V operation, integrated B-port termination, and SOIC-20 surface-mount packaging - making it optimal for industrial bus interface upgrades requiring drop-in compatibility and signal integrity assurance.

Availability

SN74ABT2245DWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy bus isolation, test equipment data paths, and programmable logic interfaces requiring stable component supply and long-term obsolescence management.

Supply support for SN74ABT2245DWR 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 with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74ABT2245DWR belongs to TI's ABT logic family, engineered for high-speed 5-V bus interfacing with enhanced noise immunity, latch-up robustness, and power-efficient BiCMOS design - targeting industrial control and instrumentation applications.

FAQ

What is the maximum operating frequency supported by SN74ABT2245DWR?

The SN74ABT2245DWR does not specify a maximum clock frequency in its datasheet because it is a level-sensitive transceiver, not a clocked device. Its usable data rate depends on propagation delay (≤3.8 ns A→B) and system setup/hold timing. In practice, it reliably supports bus toggle rates exceeding 200 MHz when used with controlled-impedance traces and proper termination - verified via switching characteristics at CL = 50 pF.

Can SN74ABT2245DWR interface directly with 3.3-V logic devices?

Yes, the SN74ABT2245DWR can receive 3.3-V logic levels on its inputs (VIH = 2.0 V min, VIL = 0.8 V max), but its outputs swing to 5-V levels. To drive 3.3-V receivers safely, use the B-port (12 mA sink, 25-Ω series resistor) with appropriate voltage clamping or add external resistive dividers - the A-port (64 mA sink) is not recommended for direct 3.3-V interface without level translation.

Does SN74ABT2245DWR require external pull-up resistors on DIR or OE pins?

SN74ABT2245DWR does not require external pull-ups on DIR or OE for basic functionality, but OE must be actively driven LOW to enable outputs. To guarantee high-impedance state above 2.1 V V_CC, TI recommends tying OE to V_CC via a pullup resistor (value determined by driver strength); floating OE is not allowed per datasheet Note 3, as it may cause undefined output states.

What is the thermal performance of SN74ABT2245DWR in SOIC-20 package?

The SN74ABT2245DWR in SOIC-20 (DW) package has a junction-to-ambient thermal resistance (θ_JA) of 97°C/W under standard JEDEC test conditions. At full 32 mA ICC load and 5 V supply, power dissipation remains below 160 mW - resulting in <16°C junction rise above ambient, well within safe operating limits for industrial applications up to +85°C ambient.

Is SN74ABT2245DWR RoHS compliant and lead-free?

Yes, SN74ABT2245DWR is RoHS compliant and features NiPdAu (NIPDAU) lead finish per TI's packaging documentation. 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 - fully compatible with standard lead-free soldering processes used in modern electronics manufacturing.