PIC18F2220-I/SO - 8-Bit 40MHz 4KB Flash MCU 28-SOIC | Microchip
MPN: PIC18F2220-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.32 | $4.32 |
| 10 | $3.92 | $39.20 |
| 100 | $3.4 | $340.00 |
| 500 | $2.95 | $1,475.00 |
| 1,000 | $2.61 | $2,610.00 |
PIC18F2220-I/SO Overview
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data bus architecture, typically using CISC or RISC instruction sets, that integrates CPU, RAM, non-volatile program memory, and peripherals. In the broader hierarchy, the PIC18F2220 sits inside the PIC18 family (8-bit PIC), which itself belongs to Microchip's PIC microcontroller portfolio, then to the microcontroller (MCU) class, and ultimately to embedded computing within the semiconductor hierarchy. The 'F' suffix denotes Flash program memory, while '2220' encodes the 28-pin pinout and 4KB Flash density. The 8-bit MCU segment targets cost-sensitive, deterministic embedded control where low power, small code footprint, and rich on-chip peripherals outweigh raw CPU throughput.
Key features of the PIC18F2220 include nanoWatt Technology power management (multiple idle/sleep modes), self-programmability, an ICD (In-Circuit Debugger) interface, and a C-compiler-friendly enhanced instruction set. The 10-bit ADC supports 10 channels of analog input, and the dual comparators enable mixed-signal designs without external components. The SSP and AUSART peripherals support communication with sensors, displays, and other MCUs at speeds sufficient for industrial control loops and consumer interfaces.
Architecture-wise, the device uses an enhanced RISC core with 16-bit opcodes, an 8-level hardware stack, and a Harvard memory organization that separates program (Flash) and data (SRAM) buses for deterministic instruction fetch. The nanoWatt feature set includes secondary oscillator, ultra-low-power wake-up, and run-time oscillator switching that lets active current drop into the microamp range during idle periods - critical for battery-powered sensor nodes and remote controls.
Typical applications for the PIC18F2220-I/SO include industrial control modules, low-cost sensor interfaces, consumer appliances, battery-powered remote controls, HVAC thermostat nodes, and small motor or fan controllers. Its 25 I/O and dual CCP also suit hobbyist and educational projects where the PIC18 instruction set is preferred over ARM Cortex-M0 parts.
Design consideration: ensure decoupling on VDD/VSS pairs (typically 100 nF ceramic), place the MCLR pull-up within 1 cm of the pin, and observe Flash endurance limits (typically 10K erase/write cycles) if the application uses runtime self-programming.
This page synthesizes XAIPART distributor pricing, pin-compatible drop-in alternatives from the same PIC18 family, and practical design notes that go beyond what the manufacturer datasheet alone provides.
Drop-in alternatives for PIC18F2220-I/SO — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC18F2220-I/SO (same form factor and footprint) — differing in Communication, Core Architecture, Package, ADC, MSL Level.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F2220-E/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F2220T-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F2221-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F2320-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4220-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F2220-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC enhanced RISC |
| Program Memory (Flash) | 4 KB (2K x 16) |
| SRAM | 512 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz |
| I/O Pins | 25 |
| ADC | 10-bit, 10 channels |
| Comparators | 2 analog comparators |
| CCP Modules | 2 Capture/Compare/PWM |
| Communication | AUSART + SSP (SPI/I2C) |
| Operating Voltage | 4.2 V to 5.5 V (Industrial I) |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Package | 28-pin SOIC (SO) |
| Mounting Type | Surface Mount |
| Power-Saving Technology | nanoWatt Technology |
| RoHS Status | Compliant |
| MSL Level | 1 |
PIC18F2220-I/SO Pin Configuration
| Pin 1 | RA2/AN2/VREF- — Digital I/O / Analog input 2 / ADC reference negative |
| Pin 2 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / ADC reference positive |
| Pin 3 | RA4/T0CKI/C1OUT — Digital I/O / Timer0 clock input / Comparator 1 output |
| Pin 4 | RA5/MCLR/VPP — Digital I/O / Master Clear (reset, active low) / Programming voltage |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RA6/OSC2/CLKO — Digital I/O / Oscillator output / Clock output |
| Pin 7 | RA7/OSC1/CLKI — Digital I/O / Oscillator input / Clock input |
| Pin 8 | RB0/INT0/AN4 — Digital I/O / External interrupt 0 / Analog input 4 |
| Pin 9 | RB1/INT1/AN5 — Digital I/O / External interrupt 1 / Analog input 5 |
| Pin 10 | RB2/INT2/AN6 — Digital I/O / External interrupt 2 / Analog input 6 |
| Pin 11 | RB3/AN7/CCP2 — Digital I/O / Analog input 7 / CCP2 PWM output |
| Pin 12 | RB4/AN8 — Digital I/O / Analog input 8 |
| Pin 13 | RB5/AN9/PGM — Digital I/O / Analog input 9 / Low-voltage programming |
| Pin 14 | RB6/PGC — Digital I/O / ICD clock (PGC) |
| Pin 15 | RB7/PGD — Digital I/O / ICD data (PGD) |
| Pin 16 | RC0/T1CKI — Digital I/O / Timer1 clock input |
| Pin 17 | RC1/CCP2 — Digital I/O / CCP2 PWM/capture/compare |
| Pin 18 | RC2/CCP1 — Digital I/O / CCP1 PWM/capture/compare |
| Pin 19 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Pin 20 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Pin 21 | RC5/SDO — Digital I/O / SPI data out |
| Pin 22 | RC6/TX/CK — Digital I/O / AUSART transmit / AUSART clock |
| Pin 23 | RC7/RX/DT — Digital I/O / AUSART receive / AUSART data |
| Pin 24 | VDD — Positive supply voltage |
| Pin 25 | VSS — Ground reference |
| Pin 26 | RA0/AN0 — Digital I/O / Analog input 0 |
| Pin 27 | RA1/AN1 — Digital I/O / Analog input 1 |
| Pin 28 | NC — Not connected (per datasheet) |
Typical Applications
PIC18F2220-I/SO is suitable for 7 applications: Industrial Control Module, Battery-Powered Sensor Node, Consumer Appliance Controller, HVAC Thermostat Node, Small Motor / Fan Controller, Remote Control / User Interface, Educational / Hobbyist Development Board.
Industrial Control Module
The PIC18F2220-I/SO fits industrial control modules thanks to its 10-bit ADC with 10 channels, 2 analog comparators, and 25 I/O pins - sufficient for multi-sensor polling loops. Operating from 4.2-5.5 V at -40 C to +85 C, it tolerates factory-floor environments without derating. The PIC18 enhanced instruction set at 40 MHz provides deterministic loop times for PID and PLC-style logic, while nanoWatt idle modes reduce duty-cycle power consumption in always-on panels.
Recommended
Battery-Powered Sensor Node
Battery-powered remote sensor nodes benefit from the PIC18F2220-I/SO's nanoWatt Technology, which offers secondary oscillator, ultra-low-power wake-up, and run-time oscillator switching. With 4 KB Flash, 512 bytes SRAM, and 256 bytes EEPROM for calibration constants, the device supports persistent sensor data without external memory. Its Industrial temperature range and 5 V supply align with typical 4xAA battery packs or solar-buck power trees.
Recommended
Consumer Appliance Controller
Consumer appliances (washing machines, dishwashers, small kitchen devices) require reliable 8-bit control with multiple PWM outputs and ADC channels - exactly what the PIC18F2220-I/SO provides via its 2 CCP modules and 10 ADC channels. The 40 MHz CPU handles user-interface polling, motor sequencing, and safety watchdog loops simultaneously. The 28-SOIC surface-mount package simplifies high-volume SMT assembly compared to DIP alternatives.
Recommended
HVAC Thermostat Node
The PIC18F2220-I/SO is a natural fit for HVAC thermostat nodes because of its 2 analog comparators (for thermostat trip detection), 10-bit ADC (for thermistor or RTD temperature sensing), and AUSART (for network communication with central controllers). Its nanoWatt Technology lets the MCU idle between temperature samples while the secondary oscillator handles real-time-clock duties, extending battery life in wireless thermostat deployments.
Recommended
Small Motor / Fan Controller
The PIC18F2220-I/SO's 2 CCP/PWM modules deliver complementary or independent PWM channels suitable for brushed DC motor or BLDC commutation support in small fans and pumps. Its 25 I/O can drive H-bridge enable lines, tachometer feedback, and overcurrent trip comparators without external logic. With 4.2-5.5 V supply, the device integrates directly with 5 V gate-driver or low-side MOSFET driver topologies.
Recommended
Remote Control / User Interface
IR remote controls, key-fob transmitters, and small user-interface panels fit the PIC18F2220-I/SO profile: low cost, low power, and enough I/O for keypads, LEDs, and IR LED drivers. The CCP/PWM can modulate IR carrier frequencies (typically 36-40 kHz) without software overhead. Combined with nanoWatt sleep modes, the MCU can sit in deep sleep until a key press wakes it, prolonging coin-cell battery life significantly.
Recommended
Educational / Hobbyist Development Board
The PIC18F2220-I/SO is widely adopted in educational and hobbyist development boards because of its mature C-compiler support (MPLAB X with XC8), in-circuit debugging (ICD), and 28-SOIC breadboard-friendly footprint. The 4 KB Flash is sufficient for introductory C exercises covering GPIO, ADC, PWM, and serial communication. Reference designs and tutorials are abundant, lowering the barrier for students and makers learning embedded firmware development.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F2220-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F2220-E/SO | PIC18F2220T-I/SO | PIC18F2221-I/SO | PIC18F2320-I/SO | PIC18F4220-I/SO |
|---|---|---|---|---|---|---|
| Package | 28-SOIC (SO) | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Program Memory | 4 KB (2K x 16) | 4 KB | 4 KB | 4 KB | 8 KB | 4 KB |
| SRAM | 512 bytes | 512 bytes | 512 bytes | 512 bytes | 512 bytes | 512 bytes |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Maximum CPU Speed | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| I/O Pins | 25 | 25 | 25 | 25 | 25 | 36 (40-pin) |
| ADC | 10-bit, 10 channels | 10-bit, 10 channels | 10-bit, 10 channels | 10-bit, 10 channels | 10-bit, 10 channels | 10-bit, 13 channels |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +125 C (Extended) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
Key Differentiators
- Industrial-grade temperature range for factory-floor reliability (vs PIC18F2221-I/SO)
- 25 I/O pins in a compact 28-SOIC footprint (vs PIC18F4220-I/SO)
- nanoWatt Technology for ultra-low standby power (vs PIC18F2320-I/SO)
Design Notes
Decouple VDD/VSS pairs (pin 12 VDD and pin 11 VSS for the PIC18F2220-I/SO) with a 100 nF ceramic capacitor placed within 5 mm of the supply pin. For designs with switching loads on VDD, add a 10 uF bulk electrolytic or tantalum capacitor at the regulator output. The device draws a few mA at 40 MHz, peaking during Flash programming operations. The MCLR pin (pin 5, RA5/MCLR/VPP) requires a 10 kOhm pull-up to VDD if no external supervisor is used, and a 100 nF capacitor on MCLR improves noise immunity.
Route the crystal or resonator traces (RA6/OSC2 and RA7/OSC1, pins 7 and 6) as short as possible and guard them with a ground pour to minimize stray capacitance. If using the internal oscillator (typically 8 MHz or 31 kHz via OSCCON register), leave RA6/RA7 available for I/O or assign them to the secondary oscillator pads. For ICD debugging, expose RB6 (PGC) and RB7 (PGD) on a 2x5 header or 0.1 inch pads for PICkit connection during bring-up.
Do not confuse the PIC18F2220 with the PIC18F2221 - the latter has an improved silicon revision with ADC linearity enhancements. Verify the exact marking on incoming parts during procurement audits. The PIC18F2220-I/SO requires 4.2 V minimum supply for Flash read operations; designs that need 3.3 V should use the PIC18LF2220 variant. AVSS/AVDD pins must be tied correctly on PCB layouts that use the ADC, even if unused, to prevent ESD paths through floating references.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - choose PIC18F2220-E/SO (Extended grade) for harsh-environment designs. Industrial temperature grade covers -40C to +85C.
