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The PIC18F4550-I/PT is an 8-bit microcontroller from Microchip Technology, belonging to the PIC18F45xx family. This microcontroller is designed for high-performance, low-power applications, offering robust features suitable for a variety of embedded control applications. It operates at a maximum frequency of 48 MHz and includes a comprehensive set of peripherals and memory resources.

Key Features

  • Core: 8-bit PIC18 microcontroller
  • Flash Memory: 32 KB (16,384 instructions)
  • RAM: 2 KB (Data Memory)
  • Operating Frequency: Up to 48 MHz
  • Package: 44-Pin TQFP (Thin Quad Flat Package)
  • USB Interface: Full-speed USB 2.0 compliant
  • Timers: Three 16-bit timers
  • ADC: 10-bit Analog-to-Digital Converter with 13 channels
  • I/O Pins: 35 Digital I/O pins
  • PWM: 1 Enhanced Capture/Compare/PWM (ECCP) module
  • Communication Interfaces: MSSP (I²C/SPI), EUSART (RS-232/RS-485), USB
  • Programming: In-circuit serial programming (ICSP) and In-Circuit Debug (ICD)


  • Program Memory (Flash): 32 KB
  • Data Memory (RAM): 2 KB
  • EEPROM: 256 Bytes

Electrical Characteristics

  • Operating Voltage: 2.0V to 5.5V
  • Current Consumption:
    • Active Mode: 11 mA @ 5V, 4 MHz
    • Idle Mode: 5.8 mA @ 5V, 4 MHz
    • Sleep Mode: 0.1 μA typical

Peripherals and Interfaces

  • USB: Integrated USB transceiver with 16 endpoints
  • Timers:
    • Timer0: 8-bit/16-bit timer with 8-bit prescaler
    • Timer1: 16-bit timer/counter with prescaler
    • Timer2: 8-bit timer with 8-bit period register, prescaler, and postscaler
  • Analog:
    • 10-bit ADC with 13 channels
    • Programmable acquisition time
  • PWM:
    • Enhanced PWM output
    • Four PWM modes
  • Communication:
    • MSSP: Master Synchronous Serial Port supporting I²C and SPI
    • EUSART: Enhanced Universal Synchronous Asynchronous Receiver Transmitter
    • USB: Full-speed USB 2.0
  • I/O Ports:
    • Five I/O ports (PORTA, PORTB, PORTC, PORTD, PORTE)
    • Individually programmable I/O pins

Operating Conditions

  • Temperature Range: -40°C to +85°C (Industrial grade)


  • Package Type: TQFP (Thin Quad Flat Package)
  • Pin Count: 44 pins
  • Dimensions: 10 mm x 10 mm


  • USB Devices: Mice, keyboards, and USB HID devices
  • Embedded Systems: Industrial automation, home appliances, and consumer electronics
  • Data Acquisition Systems: Sensor interfacing, data logging
  • Communication: Serial communication and networking devices

Development Tools

  • IDE: MPLAB X Integrated Development Environment
  • Debugger: MPLAB ICD 3, PICkit 3
  • Compiler: MPLAB XC8 Compiler

The PIC18F4550-I/PT microcontroller is a versatile and powerful solution for a wide range of applications requiring reliable performance, ample memory, and comprehensive peripheral support. Its integrated USB interface and rich feature set make it ideal for developing sophisticated embedded systems.

Additional information

Operating Temperature: -40 °C to +85 °C
Supply Voltage - Min: 4.2 V
Supply Voltage - Max: 5.5 V
RoHS: Compliant
HTS Code: 8542.31.0001
Packaging: Tray
Standard Package Quantity: 160

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