Texas Instruments SN74BCT29863BDW

Overview

SN74BCT29863BDW from Texas Instruments is a 9-bit BiCMOS bus transceiver with dual-directional data flow control, 5-V supply operation, 0°C to 70°C temperature range, and SOIC-24 package. It enables asynchronous bidirectional communication between A and B buses in industrial backplane and legacy system interconnect applications.

For engineers reviewing the SN74BCT29863BDW datasheet, SN74BCT29863BDW pinout, SN74BCT29863BDW application, or SN74BCT29863BDW equivalent, key selection considerations include its dual OEAB/OEBA control logic, high-impedance power-up state, ±24-mA output drive, and compatibility with TTL/CMOS bus systems requiring latchable or transparent data transfer modes.

Technical Context

This device implements independent enable control for both A→B and B→A data paths via separate OEAB and OEBA inputs, supporting four functional states: isolation, A-to-B, B-to-A, and latched A+B. Its BiCMOS design reduces standby current (ICCZ) while maintaining TTL-compatible input thresholds and CMOS-level output swing.

Timing behavior is defined by propagation delays under 7.5 ns (tPHL/tPLH), output-enable/disable delays under 12.6 ns (tPZL/tPHZ), and guaranteed operation across 4.5 V–5.5 V supply with 50-pF load. The device maintains high-impedance outputs during power-up/down without external reset sequencing.

Key Specifications

Pinout & Package

SN74BCT29863BDW uses a 24-pin SOIC (DW) package with 300-mil width, JEDEC MS-013 compliant footprint, and NIPDAU lead finish rated MSL Level-1 (unlimited reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74BCT29863BDW, the DWR variant offers volume-optimized packaging but no performance change, while the ACT29863 provides measurable speed gain at cost of stricter supply stability requirements and non-drop-in compatibility with older ′ALS29863-based designs.

Availability

SN74BCT29863BDW is available at Aetrix Electronics and suitable for industrial backplane interconnect, legacy system bus extension, and asynchronous data bridge applications requiring stable component supply and long-term obsolescence management.

Supply support for SN74BCT29863BDW 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic ICs for industrial, automotive, and communications markets.

The SN74BCT29863BDW belongs to TI's BCT (Bipolar-CMOS Transceiver) logic family, designed specifically for high-drive, low-standby-current bidirectional bus interfacing in 5-V systems with legacy TTL compatibility requirements.

FAQ

What is the function of OEAB1 and OEAB2 on the SN74BCT29863BDW?

OEAB1 and OEAB2 are complementary enable inputs for the A-to-B data path. Both must be driven low to activate A→B transmission; if either is high, the B-side outputs enter high-impedance state. This dual-input structure prevents accidental activation due to noise or floating inputs and matches the control architecture of legacy ′ALS29863 devices. The SN74BCT29863BDW implements this exact logic per its function table and pinout diagram.

Does the SN74BCT29863BDW support latching behavior?

Yes - the SN74BCT29863BDW supports latched operation when both OEAB1/OEAB2 and OEBA1/OEBA2 are held low simultaneously. In this mode, the transceiver captures and holds the current state of both A and B buses, effectively freezing data flow for diagnostic or synchronization purposes. This latching function is explicitly defined in the device's function table and is electrically identical to that of the ′ALS29863 it replaces.

What is the maximum output current rating for SN74BCT29863BDW?

The SN74BCT29863BDW supports ±24 mA per output pin under recommended operating conditions (VCC = 4.5 V–5.5 V, TA = 0°C–70°C). This is verified in the "electrical characteristics" table for IOL and IOH parameters. The device can drive up to 10 standard TTL loads directly, making it suitable for dense backplane routing without additional buffers. This rating applies to all A and B port pins on the SN74BCT29863BDW.

Is SN74BCT29863BDW pin-compatible with SN74ALS29863N?

Yes - the SN74BCT29863BDW is functionally and pin-compatible with SN74ALS29863N in the same SOIC-24 (DW) package. Both share identical pin assignments, logic behavior, and timing specifications, enabling direct replacement in existing designs. The SN74BCT29863BDW improves upon the ALS version with lower ICCZ and enhanced ESD protection, while preserving full backward compatibility as confirmed in TI's datasheet SCBS015D.

What package type does SN74BCT29863BDW use and what are its key mechanical features?

The SN74BCT29863BDW uses a 24-pin SOIC (DW) package with 300-mil body width, 1.27-mm lead pitch, and NIPDAU surface finish. It complies with JEDEC MS-013 standards, has MSL Level-1 rating (unlimited floor life), and is supplied in tubes of 25 units. The DW package provides proven thermal performance and hand-soldering compatibility, making it ideal for both prototyping and industrial manufacturing of the SN74BCT29863BDW.