Texas Instruments SN74BCT29827BDWR

Overview

SN74BCT29827BDWR from Texas Instruments is a 10-bit noninverting buffer/driver with dual 3-state enable inputs (OE1, OE2), BiCMOS technology, 5 V supply operation, and SOIC-24 package. It provides high-speed bus interface for memory address registers or wide data paths in industrial control and computing systems.

For engineers reviewing the SN74BCT29827BDWR datasheet, SN74BCT29827BDWR pinout, SN74BCT29827BDWR application, or SN74BCT29827BDWR equivalent, key selection criteria include 3-state output timing (tPLH ≤ 5.5 ns), IOL = 96 mA drive strength, BiCMOS ICCZ reduction, and flow-through pinout for PCB layout optimization.

Technical Context

This device implements a dual-input AND gate logic for 3-state control: outputs enter high-impedance when either OE1 or OE2 is high. P-N-P input structure minimizes DC loading on upstream drivers, while BiCMOS design enables fast switching with low quiescent current during output disable.

It supports hot-insertion-safe behavior-outputs remain in high-Z during power-up/down-and operates across 0°C to 70°C with VCC = 4.5–5.5 V. Input voltage range extends to −0.5 V to 7 V, and outputs tolerate −0.5 V to 5.5 V in disabled state.

Key Specifications

Pinout & Package

SN74BCT29827BDWR is housed in a 24-pin SOIC (DW) package with 300-mil width, tube packaging (25 units), and RoHS-compliant NiPdAu lead finish. The flow-through pinout minimizes trace crossings and simplifies routing on dense PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit 3-state buffer applications.

Compared with SN74ACT244N and SN74LS244N, the SN74BCT29827BDWR uniquely delivers 10-bit width, 96 mA drive, sub-6 ns timing, and BiCMOS efficiency - making it optimal for new industrial bus interface designs requiring density, speed, and robustness.

Availability

SN74BCT29827BDWR is available at Aetrix Electronics and suitable for memory address buffering, industrial backplane interfacing, and test equipment signal routing requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74BCT29827BDWR 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, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The BCT family was engineered for high-speed 5 V TTL-compatible bus interfacing, combining bipolar speed with CMOS power efficiency - specifically targeting memory expansion, backplane signaling, and industrial control systems.

FAQ

What is the function of OE1 and OE2 on the SN74BCT29827BDWR?

The SN74BCT29827BDWR uses OE1 and OE2 as active-low 3-state enable inputs connected via an internal AND gate. If either input is high, all ten Y outputs enter high-impedance mode. This dual-enable architecture allows flexible bus arbitration - for example, OE1 may be controlled by a master processor while OE2 responds to a peripheral ready signal. The SN74BCT29827BDWR guarantees high-Z behavior during power transitions, preventing bus contention.

Does the SN74BCT29827BDWR support hot-swap operation?

Yes, the SN74BCT29827BDWR supports hot-swap operation due to its inherent power-up/power-down high-impedance feature. During supply ramp-up or ramp-down, all outputs remain in high-Z regardless of OE state - eliminating bus conflicts when inserting or removing modules in live backplanes. This behavior is guaranteed across the full 0°C to 70°C operating range and does not require external circuitry. The SN74BCT29827BDWR's 2000 V HBM ESD rating further enhances reliability in such environments.

What is the maximum capacitive load the SN74BCT29827BDWR can drive reliably?

The SN74BCT29827BDWR is characterized with CL = 50 pF for switching specifications, and its 96 mA low-level output current (IOL) supports driving ≥10 standard TTL loads or ≥20 CMOS inputs under typical conditions. Real-world drive capability depends on trace length and termination; for 50 Ω transmission lines, the 8 pF typical output capacitance helps limit rise/fall time degradation. The SN74BCT29827BDWR maintains tPHL ≤ 7.5 ns even at full IOL, ensuring timing predictability in loaded bus configurations.

Is the SN74BCT29827BDWR pin-compatible with other 24-pin SOIC bus buffers?

No, the SN74BCT29827BDWR has a unique 10-bit flow-through pinout (A1–A10 on left, Y1–Y10 on right, dual OE on corners) not shared by octal or 16-bit buffers. While it shares the SOIC-24 package footprint, pin functions differ significantly from devices like SN74ACT244 or SN74LS244. Substituting requires PCB redesign. The SN74BCT29827BDWR's pin mapping is optimized for minimal trace crossovers - a deliberate layout advantage, not a compatibility feature.

What is the significance of the "BCT" designation in SN74BCT29827BDWR?

The "BCT" in SN74BCT29827BDWR denotes Texas Instruments' BiCMOS Transistor logic family - a hybrid process combining bipolar transistors for speed and CMOS for low static power. This gives the SN74BCT29827BDWR both TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and BiCMOS advantages: 6 mA max ICCZ versus 40 mA in equivalent LS devices, plus faster switching (5.5 ns vs. 15 ns). The SN74BCT29827BDWR leverages BCT to deliver high fanout without sacrificing efficiency.