Texas Instruments SN74BCT29862BDWR

Overview

SN74BCT29862BDWR from Texas Instruments is a 10-bit bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between two 10-bit buses. It supports A-to-B and B-to-A direction control via independent OEAB and OEBA inputs, operates at 4.5–5.5 V, delivers ±48 mA output drive, and features power-up high-impedance state for hot-insertion safety in industrial backplane systems.

For engineers reviewing the SN74BCT29862BDWR datasheet, SN74BCT29862BDWR pinout, SN74BCT29862BDWR application, or SN74BCT29862BDWR equivalent, key selection criteria include its BiCMOS standby current reduction, 3.6 ns typical propagation delay (A→B), 50 pF load switching performance, and compatibility with legacy TTL/LS logic families in legacy computing and telecom infrastructure upgrades.

Technical Context

This device implements dual-directional bus isolation using separate output-enable controls (OEAB and OEBA) to select data flow direction or latch both buses (L/L), enabling flexible timing in asynchronous bus arbitration. Its BiCMOS process reduces ICC(off) to 6.5 mA typical while maintaining TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and 5-V supply operation.

Switching behavior is characterized under 50-pF capacitive load with 500-Ω source termination; tPLH/tPHL range from 1–6.1 ns depending on temperature and voltage, and output enable/disable delays (tPZH/tPLZ) are specified up to 12.5 ns across the 0°C to 70°C commercial range.

Key Specifications

Pinout & Package

SN74BCT29862BDWR uses a 24-pin plastic small-outline (DW) package with 300-mil width and gull-wing leads. Pin 1 is OEBA, pin 24 is OEAB; pins 2–11 connect to A1–A10, pins 13–22 to B1–B10; pin 12 is GND, pin 23 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74BCT29862N and SN74ACT29862DWR, the SN74BCT29862BDWR offers optimal balance of proven reliability, surface-mount compatibility, and seamless integration into existing 5-V TTL systems without redesign.

Availability

SN74BCT29862BDWR is available at Aetrix Electronics and suitable for industrial backplane interconnect, legacy computer bus extension, and telecom line card interface requiring stable component supply and long-term obsolescence management.

Supply support for SN74BCT29862BDWR 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 with broad industrial, automotive, and communications reach.

The BCT logic family-including SN74BCT29862BDWR-was engineered for high-speed, low-power 5-V TTL interoperability in mission-critical backplane and control systems during the 1990s transition era.

FAQ

What is the maximum operating temperature range for SN74BCT29862BDWR?

The SN74BCT29862BDWR is rated for operation from 0°C to 70°C, meeting commercial-grade specifications. This range supports deployment in office equipment, industrial controllers, and telecom infrastructure where ambient temperatures remain within standard environmental limits. The device's BiCMOS construction ensures stable timing and output drive across this full span without derating.

Does SN74BCT29862BDWR support true bidirectional data flow without external logic?

Yes, SN74BCT29862BDWR supports true bidirectional flow via dedicated OEAB and OEBA inputs: asserting OEAB low enables B-to-A transfer while OEBA remains high, and vice versa. When both are low, it latches A and B buses (A = B); when both are high, both ports enter high-impedance isolation-no external gates or direction-control logic required.

Is SN74BCT29862BDWR pin-compatible with older 'ALS29862 devices?

Yes, SN74BCT29862BDWR is functionally and pin-compatible with the 74ALS29862 and AMD Am29862A, sharing identical pin assignments, logic functions, and DC/AC electrical behavior. Its BiCMOS process improves standby current and ESD robustness while preserving drop-in replacement capability in existing PCB layouts.

What is the recommended decoupling strategy for SN74BCT29862BDWR?

Place a 0.1 µF ceramic capacitor between VCC (pin 23) and GND (pin 12) as close as possible to the SN74BCT29862BDWR package body. For systems with heavy switching activity, add a 4.7 µF tantalum or aluminum electrolytic capacitor nearby to suppress low-frequency rail droop. Avoid shared vias between decoupling paths and signal returns.

Can SN74BCT29862BDWR be used in hot-swap applications?

Yes, SN74BCT29862BDWR is designed for hot-swap use: outputs default to high-impedance during power-up and power-down, preventing bus contention. Its 2000 V HBM ESD rating and robust output stage (±48 mA drive) further support safe insertion/removal in live backplane environments-no external protection circuitry is required.