74HC595 Shift Register (Serial-In Parallel-Out)

74HC595 Shift Register (SIPO – Serial-In Parallel-Out) is a popular 8-bit shift register used to expand digital outputs using only 3 microcontroller pins. It converts serial data into 8 parallel outputs, making it ideal for driving LEDs, 7-segment displays, relays (with driver), and many DIY electronics projects.

Key Features

• 8-bit Serial-In Parallel-Out (SIPO) output expansion

• Controls 8 outputs using 3 pins (DATA, CLOCK, LATCH)

• Daisy-chain support (connect multiple 74HC595 for 16/24/32+ outputs)

• Separate shift register + storage register for stable outputs

• Output enable and reset pins for flexible control

• Works with Arduino, ESP32, ESP8266, Raspberry Pi, STM32, etc.

Applications

• LED chaser / running lights

• 7-segment and multi-digit display control

• RGB LED and matrix driving (with proper resistors/driver)

• Output expansion for robotics and automation

• Relay control projects (use transistor/relay module)

Used In

• Arduino output expansion projects

• IoT devices needing extra GPIO

• Digital signage, indicators, dashboards

• DIY electronics kits and learning labs

Package Includes

• 1× 74HC595 Shift Register IC