I2C / IIC Serial Interface Backpack Module for Character LCD (PCF8574)
I2C / IIC Serial Interface Backpack Module for Character LCD (PCF8574)
An I2C backpack that solders to the back of a parallel character LCD and drives it over just two data wires using a PCF8574 expander. It reduces a 16-pin parallel LCD to a 2-wire I2C connection.
Specifications
- PCF8574 I2C expander IC
- 5V operating voltage
- Converts I2C to parallel for LCD
- 2 IIC interfaces
- Contrast potentiometer
- Backlight jumper
- Address-changeable via solder jumpers (up to 8 on one bus)
- PCB 4.2 x 2 cm
Compatible with
- 16x2 character LCD
- 20x4 character LCD
- Arduino and most microcontrollers
- HD44780-compatible displays
Build it with Compoden's AI
Tell Compoden's AI build assistant what you want to display and it picks a compatible screen, checks it against your board's interface and voltage, and hands you the wiring and the driver code matched to the exact module - all from real in-stock parts.
Built and Backed by Compoden
We have spent 10 years supplying displays, boards, and parts to makers, schools, and engineering teams across India. Every Compoden order includes our AI build companion to help you wire the screen and write the driver code.
What chip does it use?
A PCF8574 I2C I/O expander.
Which displays does it fit?
Standard HD44780 parallel character LCDs including 16x2 and 20x4.
Can I use more than one on the same bus?
Yes, the address is changeable via solder jumpers, allowing up to 8 modules on one I2C bus.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items