PCF8574 8-Bit I2C I/O Expander IC SOIC-16 – 5 Pack
PCF8574 8-Bit I2C I/O Expander IC SOIC-16 – 5 Pack
PCF8574 8-Bit I²C I/O Expander IC – 5-Piece Set (SOIC-16)
Expand your microcontroller's GPIO capabilities with ease using the PCF8574 8-Bit I/O Expander IC. This 5-pack of brand-new SOIC-16 surface-mount chips allows you to add up to 8 additional general-purpose I/O lines to any I²C-compatible system — perfect for Arduino, Raspberry Pi, and other embedded platforms.
Key Features
- 8-Bit Parallel I/O: Each chip provides 8 independently configurable input/output lines via the I²C bus.
- I²C Interface: Simple 2-wire communication (SDA/SCL) with up to 8 devices addressable on the same bus using address pins A0–A2.
- SOIC-16 Package: Compact surface-mount form factor, ideal for PCB integration and space-constrained designs.
- Wide Supply Voltage: Operates over a broad voltage range (2.5V–6V), compatible with 3.3V and 5V logic systems.
- Low Standby Current: Energy-efficient design with minimal quiescent current draw.
- Interrupt Output: Active-low interrupt line notifies the host controller of input state changes without continuous polling.
- Quantity: Pack of 5 — ideal for prototyping, projects, or stocking your workshop bench.
- Condition: Brand new, authentic components.
Typical Applications
- Expanding GPIO on Arduino, ESP32, Raspberry Pi, and other microcontrollers
- LCD and LED display driving via I²C backpack modules
- Keypad matrix and button input interfacing
- Industrial control panels and relay driver boards
- Sensor hub and multi-device I²C bus expansion
Specifications
| Part Number | PCF8574T/3,518 |
| Package | SOIC-16 |
| Interface | I²C (2-wire) |
| I/O Lines | 8-bit parallel |
| Supply Voltage | 2.5V – 6V |
| Condition | New |
| High-Concern Chemicals | None |
| Quantity | 5 PCS |
| Country of Origin | Made in Mainland China |
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Frequently Asked Questions
Q: What is the PCF8574 I²C I/O Expander IC used for?
A: The PCF8574 is an 8-bit general-purpose I/O expander that communicates over the I²C bus. It is widely used to add more input/output lines to microcontrollers like Arduino, ESP32, and Raspberry Pi — enabling control of LCD displays, keypads, relays, LEDs, and other peripherals without consuming extra GPIO pins on your main controller.
Q: How many PCF8574 chips can I connect on the same I²C bus?
A: Up to 8 PCF8574 devices can share the same I²C bus simultaneously. Each chip's I²C address is set using three hardware address pins (A0, A1, A2), giving 8 unique addresses and a total of up to 64 additional I/O lines on a single bus.
Q: Is the SOIC-16 package compatible with standard PCBs and breadboard adapters?
A: The SOIC-16 is a surface-mount package. While it cannot be inserted directly into a standard breadboard, it is easily used with SOIC-to-DIP adapter boards (widely available) or soldered directly onto a custom or pre-made PCB for a compact, reliable installation.
Q: Are these chips new or refurbished?
A: All 5 chips in this pack are brand new components in original condition. They carry no high-concern chemicals and are sourced as genuine PCF8574T/3,518 integrated circuits.