74HC595 8-Bit Serial-In Parallel-Out Shift Register IC DIP-16 – Output Latch, 3-State

74HC595 8-Bit Serial-In Parallel-Out Shift Register IC – DIP-16

The 74HC595 is the most popular output expander IC in the maker and embedded systems world – it takes serial data from a microcontroller over 3 wires (DATA, CLOCK, LATCH) and drives 8 parallel outputs simultaneously. Connect one to an Arduino and drive 8 LEDs, relays, or digital outputs using only 3 GPIO pins. Cascade multiple ICs to drive 16, 24, or 32 outputs with the same 3-wire interface. The output latch ensures all 8 outputs update simultaneously, preventing glitches during data shifting.

Electrical Specifications

• Part Number: 74HC595 / SN74HC595N / MC74HC595AN
• Package: DIP-16 (through-hole, 2.54mm pitch)
• Function: 8-bit serial-in, parallel-out shift register with output latch
• Supply Voltage: 2V – 6V
• Clock Frequency: Up to 25MHz at 4.5V
• Output Drive Current: ±25mA per pin (70mA total)
• Output Enable (̅O̅E̅): Active LOW – tri-state all outputs when HIGH
• Master Reset (̅M̅R̅): Active LOW – clears shift register (not output latch)
• Operating Temperature: −40°C to +125°C

How the 74HC595 Works

• Step 1 – Shift: Clock in 8 bits of data via DS (serial data) and SHCP (shift clock) – data enters the shift register
• Step 2 – Latch: Pulse STCP (storage clock / latch) – all 8 bits transfer to output latch simultaneously
• Result: Q0–Q7 outputs update all at once – no glitches during shifting
• Cascade: Connect Q7S (serial output) of IC1 to DS of IC2 for 16-bit expansion

Arduino Wiring (3 Pins)

• DS (Pin 14) → Arduino data pin (e.g., D11)
• SHCP (Pin 11) → Arduino clock pin (e.g., D13)
• STCP (Pin 12) → Arduino latch pin (e.g., D8)
• ̅O̅E̅ (Pin 13) → GND (always enabled)
• ̅M̅R̅ (Pin 10) → VCC (no reset)

Typical Applications

• Arduino GPIO expansion: Drive 8 LEDs, relays, or digital outputs with 3 pins
• LED matrix driver: Row or column driver for LED matrix displays
• 7-segment display driver: Drive 7-segment displays via serial interface
• Relay board control: Control 8 relays from 3 microcontroller pins
• Cascaded expansion: Chain for 16, 24, 32+ digital outputs

Package Contents

• 1 × 74HC595 DIP-16 8-bit serial-in parallel-out shift register IC

3 pins in, 8 outputs out – the 74HC595 is the essential output expander for Arduino, Raspberry Pi, and any microcontroller project needing more digital outputs.

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