SN74BCT760DW

Updated: 2026-09-11

Overview

The SN74BCT760DW is a member of Texas Instruments' BCT (BiCMOS/TTL) logic family, optimized for high-speed bus interface applications. Designed with BiCMOS technology, it combines the low power consumption of CMOS with the drive strength of bipolar transistors. The device operates within a 4.5V to 5.5V range, making it suitable for TTL-level systems. Its 20-pin SOIC (DW) package ensures compatibility with automated PCB assembly processes. Typical applications include backplane driving, memory address buffering, and general-purpose bus isolation in industrial and telecom systems. As a bidirectional buffer, it features 3-state outputs for bus sharing, with propagation delays under 10ns. The SN74BCT760DW is characterized for operation from -40°C to 85°C, meeting industrial environment requirements. Texas Instruments provides comprehensive documentation including timing diagrams and layout recommendations to facilitate integration into system designs.

Structure and Working Principle

The SN74BCT760DW integrates eight bidirectional buffers with independent output enable controls. Each channel consists of input Schmitt triggers for noise immunity, followed by BiCMOS driver stages capable of sourcing/sinking 64mA. The device employs a direction control pin (DIR) that determines data flow, while output enable (OE) pins place outputs in high-impedance state when deactivated. Internally, the BiCMOS architecture uses CMOS logic for low static power consumption and bipolar transistors for strong output drive. Power supply decoupling is critical for stable operation, with a recommended 0.1μF ceramic capacitor placed near VCC. The inputs are TTL-compatible, accepting signals as low as 0.8V for logic '0' and as high as 2V for logic '1', while outputs maintain standard TTL voltage levels even under heavy loading.

Key Features

The SN74BCT760DW offers several distinguishing characteristics. Its 3-state outputs allow multiple devices to share a common bus without contention, with output disable times typically under 25ns. The device features 12mA balanced output drive (IOL/IOH), reducing ground bounce in multi-drop configurations. Enhanced ESD protection (up to 2000V HBM) safeguards against electrostatic discharge during handling. Notably, the part exhibits low quiescent current (ICC < 10μA max) in disabled mode, making it suitable for battery-sensitive applications. The symmetrical output impedance minimizes signal reflections in transmission line environments. Texas Instruments' proprietary die coating enhances reliability in humid conditions, while the SOIC package's thermal resistance (θJA ≈ 73°C/W) supports continuous operation at full load within specified temperature limits.

Application Areas

Primary applications for the SN74BCT760DW span across industrial control systems where robust signal buffering is required. It serves as an ideal interface between microprocessors and peripheral devices in factory automation equipment, particularly in noisy electrical environments. Telecommunications infrastructure utilizes these buffers for backplane driving in rack-mounted systems, ensuring signal integrity over long PCB traces. In computing, the device finds use in memory subsystems for address line buffering, especially in multi-module configurations. Automotive electronics designers employ it in diagnostic interfaces where TTL-level translation is needed between ECUs and test equipment. The part's radiation-hardened variants are specified for aerospace applications, though the commercial DW version is limited to terrestrial environments. Emerging IoT gateways also incorporate these buffers for legacy interface support.

Maintenance and Precautions

Proper handling of the SN74BCT760DW begins with ESD precautions—use grounded workstations and wrist straps during installation. Thermal management requires attention in high-density layouts; maintain at least 1mm air flow around the package in continuous full-load operation. For wave soldering, limit exposure to 260°C for no more than 10 seconds to prevent package delamination. System designers should implement proper decoupling—place 0.01μF and 0.1μF capacitors within 5mm of VCC pins. Avoid floating inputs as they may cause excess current draw; unused control pins should be tied to VCC or GND through 10kΩ resistors. When driving long transmission lines (>30cm), series termination resistors (22-33Ω) near the driver output are recommended to dampen reflections. Periodic inspection for solder joint integrity is advised in high-vibration environments.

B2B Procurement Guide

When procuring SN74BCT760DW in bulk, verify Texas Instruments' date codes to ensure fresh stock, as prolonged shelf life may affect solderability. Industrial buyers should request moisture sensitivity level (MSL) documentation—this device is typically MSL3, requiring baking if exposed beyond 168 hours. Consider tape-and-reel packaging (2500 units/reel) for automated assembly lines to reduce handling costs. Evaluate alternative sources carefully—while second-source options exist, electrical parameters may vary slightly. For prototype quantities, authorized distributors like Digi-Key or Mouser provide guaranteed authentic parts. Lead times for production volumes (1000+ units) typically range 6-8 weeks; expedited options may incur 15-20% premiums. Some suppliers offer programming services for related PLDs using the same shipment—consolidating orders can reduce logistics costs. Always request factory test reports for military or medical applications.