74HC245 (Octal Bus Transceiver- 3 State Outputs)

Overview

The 74HC245 is a high-speed CMOS octal bus transceiver designed for bidirectional asynchronous communication between two data buses. With 3-state outputs and a robust 2V–6V operating range, this IC is a staple in digital electronics for multiplexed data lines, memory interfacing, and microcontroller expansion. Its 20-pin DIP package makes it breadboard-friendly and perfect for prototyping and educational projects.

Key Features

• Octal bidirectional bus transceiver – handles 8-bit data flow in both directions.
• 3-state outputs – allows bus isolation and prevents data contention.
• Wide supply voltage range (2V to 6V) – compatible with TTL, CMOS, and microcontroller logic levels.
• High noise immunity – characteristic of HC (High-speed CMOS) family.
• Low power consumption – efficient for battery-operated devices.
• Standard 20-pin DIP package – ideal for breadboards and through-hole soldering.

Technical Specifications

• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: 3-State
• Current - Output High, Low: 5.2mA, 5.2mA
• Voltage - Supply: 2V ~ 6V
• Package / Case: 20-DIP (0.300", 7.62mm)
• Logic Family: 74HC
• Operating Temperature: Typically -40°C to +85°C (refer to datasheet)

Applications & Use Cases

• Microcontroller I/O expansion – drive multiple LEDs, relays, or read multiple sensors.
• Data bus buffering – isolate and drive address/data lines in memory systems.
• Level shifting – interface 3.3V and 5V logic systems (with careful consideration).
• Multiplexed data lines – share data lines between multiple peripherals.
• Educational projects – learn about bus architecture and tri-state logic.

What's Included

• 1x 74HC245 Octal Bus Transceiver (20-pin DIP IC)

Compatibility

• Works with Arduino, Raspberry Pi (via level shifters), PIC, AVR, STM32, and other microcontrollers.
• Compatible with standard breadboards and 20-pin DIP sockets.
• Can be used with TTL and CMOS logic families within the 2V–6V supply range.

MOKWN Recommendation

For Egyptian makers and engineers, the 74HC245 is an essential component for building reliable digital systems. Whether you're expanding your Arduino's I/O or designing a data bus for a homebrew computer, this transceiver offers dependable performance at an affordable price. Order now from MOKWN and get fast delivery across Egypt.