onsemi

MC74LCX245DTR2

MC74LCX245DTR2 Description

The MC74LCX245DTR2 from onsemi is an 8-bit bidirectional transceiver designed for low-voltage (2V to 5.5V) digital systems. Packaged in a 20-pin TSSOP and supplied in Tape & Reel (TR), this device is part of the 74LCX series, offering non-inverting data transmission with 24mA output drive capability (both high and low). It features bidirectional data flow controlled by a direction pin (DIR), making it ideal for bus isolation and data routing in mixed-voltage environments. Though marked as obsolete, it remains relevant for legacy designs due to its low power consumption, 5V-tolerant inputs, and REACH compliance.

MC74LCX245DTR2 Features

• Wide Voltage Range (2V–5.5V): Compatible with 3.3V and 5V systems, enabling seamless interfacing.
• High Drive Strength (24mA): Supports robust signal integrity in bus-heavy applications.
• Bidirectional Operation: DIR pin controls data flow, simplifying bus management.
• 5V-Tolerant Inputs: Allows safe connection to higher-voltage logic without level shifters.
• Low Power Consumption: Optimized for battery-operated or energy-sensitive designs.
• Surface-Mount (TSSOP): Compact footprint suits space-constrained PCBs.
• MSL 1 (Unlimited): No baking required prior to reflow, easing assembly.

MC74LCX245DTR2 Applications

• Bus Interface Circuits: Isolates and buffers data buses in microcontrollers or FPGAs.
• Mixed-Voltage Systems: Bridges 3.3V and 5V logic domains (e.g., legacy industrial controls).
• Portable Electronics: Low-voltage operation suits handheld devices and IoT sensors.
• Automotive/Industrial Modules: Reliable performance in harsh environments (with proper PCB design).
• Data Routing: Used in multiplexers or signal switches for test equipment.

Conclusion of MC74LCX245DTR2

The MC74LCX245DTR2 excels in bidirectional data transfer with low-voltage flexibility and strong drive capability, making it a pragmatic choice for legacy or cost-sensitive designs. While obsolete, its 5V tolerance, compact packaging, and ease of integration ensure continued utility in mixed-voltage systems, bus isolation, and portable electronics. Engineers should evaluate alternatives for new designs but may leverage this IC for repairs or backward compatibility.