Texas Instruments SN74ABT863DW

Overview

SN74ABT863DW from Texas Instruments is a 9-bit noninverting bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in industrial control and computing systems. It operates at 4.5–5.5 V, delivers ±32-mA high-drive outputs, features high-impedance state during power up/down, and is rated for –40°C to 85°C.

For engineers reviewing the SN74ABT863DW datasheet, SN74ABT863DW pinout, SN74ABT863DW application, or SN74ABT863DW equivalent, this page provides verified functional identity, SOIC-24 package mapping, dual OE control logic, latch-up immunity (>500 mA), and real-world timing parameters including tPLH = 1 ns (min) and tPZH = 1 ns (min).

Technical Context

The SN74ABT863DW implements dual independent output-enable controls (OEAB1/OEAB2 and OEBA1/OEBA2) enabling flexible direction selection: low on both OEAB inputs enables A→B transmission; low on both OEBA inputs enables B→A transmission; any high OE pair forces isolation. Its EPIC-II^B BiCMOS process ensures low ground bounce (VOLP < 1 V) and fast switching (tPHL ≤ 3.9 ns typical at 5 V).

It supports hot-insertion safety via inherent power-up/power-down high-impedance behavior below 2.1 V VCC, and maintains I/O leakage ≤ ±20 µA across full operating range. The device requires no external pullups for guaranteed Hi-Z above 2.1 V only when OE is actively driven - otherwise a pullup resistor is recommended per TI SCBA004 guidance.

Key Specifications

Pinout & Package

SN74ABT863DW is housed in a 24-pin SOIC (DW) package with 1.27-mm pitch, 7.5-mm body width, and JEDEC MS-013 compliant footprint. Thermal resistance θJA = 81°C/W enables reliable operation at up to 38 mA ICC (max) without forced airflow.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 9-bit bus transceiver applications.

Compared with SN74ABT863DW, SN74ABT823DW offers identical electrical behavior but reduced data width, requiring duplication for 9-bit use; SN74LVTH16245ADGGR provides wider bus support and voltage flexibility but sacrifices drive strength and 5-V-native timing performance.

Availability

SN74ABT863DW is available at Aetrix Electronics and suitable for industrial backplane buses, legacy system data bridges, telecom line card interfaces, and test equipment signal routing requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SN74ABT863DW 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 decades of heritage in high-reliability interface ICs.

The SN74ABT863DW belongs to TI's ABT logic family - engineered for high-speed, high-drive 5-V bus interfacing in industrial and communications infrastructure where signal integrity and power-up safety are critical.

FAQ

What is the function of the dual OE inputs (OEAB1/OEAB2 and OEBA1/OEBA2) on the SN74ABT863DW?

The SN74ABT863DW uses dual-input AND logic per direction: both OEAB1 and OEAB2 must be LOW to enable A→B data flow, and both OEBA1 and OEBA2 must be LOW to enable B→A flow. This design prevents accidental bus activation from noise or floating inputs - a single HIGH on either OE pair forces that direction into high-impedance state. The SN74ABT863DW does not support partial enablement; all nine bits in a direction activate or deactivate together.

Does the SN74ABT863DW require external pull-up resistors on its OE inputs?

The SN74ABT863DW guarantees high-impedance outputs when VCC is below 2.1 V regardless of OE state, but above 2.1 V, OE must be actively driven LOW to enable transmission or held HIGH (e.g., via pullup) to maintain Hi-Z. TI recommends a pullup resistor to VCC if OE is not actively controlled - minimum value depends on driver sink capability, typically 1–10 kΩ. This requirement applies specifically to the SN74ABT863DW and is documented in SCBA004.

Can the SN74ABT863DW operate reliably at 4.5 V supply voltage?

Yes - the SN74ABT863DW is fully specified from 4.5 V to 5.5 V. At 4.5 V, it maintains VOH ≥ 2.0 V (with IOH = –32 mA), VOL ≤ 0.55 V (with IOL = 64 mA), and tPHL ≤ 3.9 ns (max), meeting all key timing and voltage thresholds for 5-V TTL interoperability. These values are measured and guaranteed per the SCBS201E datasheet, confirming robust operation across the entire recommended VCC range for the SN74ABT863DW.

Is the SN74ABT863DW pin-compatible with other 24-pin SOIC bus transceivers like the 74ACT245?

No - the SN74ABT863DW has a unique 9-bit dual-OE pinout incompatible with 8-bit transceivers such as the 74ACT245. Pin 1 is OEBA1 (not DIR), pins 2–10 are A1–A9 (not A0–A7), and OEAB1/OEAB2 occupy pins 24/25 instead of a single DIR input. Substituting the SN74ABT863DW for a 74ACT245 would require PCB redesign. Always verify pin mapping using the DW-package top view diagram in the SN74ABT863DW datasheet.

What thermal considerations apply to the SN74ABT863DW in continuous operation?

The SN74ABT863DW in SOIC-24 (DW) package has θJA = 81°C/W. At maximum ICC = 38 mA and VCC = 5.5 V, worst-case power dissipation is ~210 mW, resulting in ~17°C junction-to-ambient rise above ambient - well within safe limits for industrial use up to +85°C ambient. No heatsink is required, but ensure ≥250 mils clearance around the device and use at least two 0.1-µF ceramic decoupling caps near pins 10 (GND) and 20 (VCC) to suppress switching noise affecting the SN74ABT863DW's stability.