PIC18F4220-I/P - 8-Bit 40MHz 4KB Flash MCU 40-PDIP | Microchip
MPN: PIC18F4220-I/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.13 | $8.13 |
| 10 | $7.2 | $72.00 |
| 100 | $6.18 | $618.00 |
| 500 | $5.42 | $2,710.00 |
| 1,000 | $4.78 | $4,780.00 |
PIC18F4220-I/P Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, RAM, and peripherals. The PIC18F family sits within the broader hierarchy of microcontrollers -> 8-bit microcontrollers -> PIC18 architecture -> CMOS Flash microcontrollers. PIC18F devices are upward compatible with PIC16C5X, PIC12CXXX, PIC16CXX, and PIC17CXX families, providing a seamless migration path for existing code bases while adding higher performance and richer peripherals.
Key features of the PIC18F4220-I/P include 10 MIPS throughput (100 ns instruction cycle), 77 single-word instructions, 16-bit instructions with 8-bit data path, hardware multiply, two 8-bit timers plus three 16-bit timers, two capture/compare/PWM modules, an Enhanced USART, MSSP supporting SPI and I2C, two analog comparators, a 10-bit ADC with 13 channels, and a programmable low-voltage detection circuit. The I-grade parts operate over the industrial temperature range of -40C to +85C.
The device uses a modified Harvard architecture with separate program and data buses, and its nanoWatt technology provides six software-controlled power-managed modes that reduce quiescent current to under 1 uA in sleep, dramatically extending battery life in portable applications. Brown-out Reset, Power-on Reset, and a Watchdog Timer with its own on-chip RC oscillator ensure robust operation in noisy industrial environments.
Typical applications include industrial control and automation, sensor interface nodes, small appliances and white goods, HVAC controllers, automotive body electronics, low-cost data acquisition modules, and battery-powered handheld instruments. The 36 I/O count and rich peripheral mix suit designs that require multiple communication interfaces plus analog sensing without an external ADC.
When designing with the PIC18F4220-I/P, ensure the ICSP programming interface is accessible (PGC/PGD on RB6/RB7) and that decoupling is placed close to VDD/VSS pins. Developers should select an MPLAB X IDE-compatible toolchain and use the PIC18 instruction set extensions for hardware multiply and table reads when porting legacy PIC16 code.
This page consolidates distributor pricing, drop-in pin-compatible alternatives within the PIC18F4xxx family, and practical design notes not found in the bare datasheet, enabling faster sourcing decisions for engineers.
Drop-in alternatives for PIC18F4220-I/P — 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 PIC18F4220-I/P (same form factor and footprint) — differing in Package, Timers, Operating Temperature, MSL Level, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F4221-I/P
✅ Drop-In✓ In Stock
$3.15 / Unit
View Datasheet →PIC18F4220-E/P
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →PIC18F4520-I/P
✅ Drop-In✓ In Stock
$5.35 / Unit
View Datasheet →PIC18F4620-I/P
✅ Drop-In✓ In Stock
$5.08 / Unit
View Datasheet →PIC18F4321-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4220-I/P Maximum Ratings & Electrical Characteristics
| Core Processor | PIC |
| Core Size | 8-Bit |
| Core Architecture | PIC18 |
| Speed (Max) | 40 MHz |
| Performance | 10 MIPS |
| Instruction Cycle Time | 100 ns |
| Program Memory Type | Flash |
| Program Memory Size | 4 KB (2K x 16) |
| RAM Size | 512 bytes |
| EEPROM Size | 256 bytes |
| Number of I/O | 36 |
| ADC | 10-bit, up to 13 channels |
| Connectivity | I2C, SPI, UART/USART |
| Timers | 2 x 8-bit, 3 x 16-bit |
| PWM Modules | 2 CCP |
| Package | 40-PDIP (0.600", 15.24 mm) |
| Mounting Type | Through-Hole |
| Operating Temperature | -40C to +85C (Industrial) |
| Operating Voltage | 2.0 V to 5.5 V |
| Power Management | nanoWatt (6 software modes) |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| Brown-out Reset | Yes |
| Analog Comparators | 2 |
| Program Memory Type | FLASH (In-System/In-Application Programmable) |
| RoHS Status | Compliant |
| MSL Level | Not applicable (through-hole) |
PIC18F4220-I/P Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (Reset) input / programming voltage |
| Pin 2 | RA0/AN0 — PORTA bit 0 / analog input channel 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / analog input channel 1 |
| Pin 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input / ADC VREF- |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input / ADC VREF+ |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / analog / SPI slave select |
| Pin 8 | RE0/RD/AN5 — PORTE bit 0 / read control / analog |
| Pin 9 | RE1/WR/AN6 — PORTE bit 1 / write control / analog |
| Pin 10 | RE2/CS/AN7 — PORTE bit 2 / chip select / analog |
| Pin 11 | VDD — Positive supply (+2.0 V to +5.5 V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKI — Crystal/clock input |
| Pin 14 | OSC2/CLKO/RA6 — Crystal output / clock out / PORTA bit 6 |
| Pin 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator / clock |
| Pin 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 osc / CCP2 |
| Pin 17 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Pin 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 19 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 20 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 21 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Pin 22 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Pin 23 | RD0/PSP0 — PORTD bit 0 / parallel slave port |
| Pin 24 | RD1/PSP1 — PORTD bit 1 / parallel slave port |
| Pin 25 | RD2/PSP2 — PORTD bit 2 / parallel slave port |
| Pin 26 | RD3/PSP3 — PORTD bit 3 / parallel slave port |
| Pin 27 | RD4/PSP4 — PORTD bit 4 / parallel slave port |
| Pin 28 | RD5/PSP5 — PORTD bit 5 / parallel slave port |
| Pin 29 | RD6/PSP6/TX2 — PORTD bit 6 / PSP / USART2 TX (AUX) |
| Pin 30 | RD7/PSP7/RX2 — PORTD bit 7 / PSP / USART2 RX (AUX) |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply (+2.0 V to +5.5 V) |
| Pin 33 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Pin 34 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Pin 35 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Pin 36 | RB3/CCP2 — PORTB bit 3 / CCP2 (alternate) |
| Pin 37 | RB4 — PORTB bit 4 (interrupt-on-change) |
| Pin 38 | RB5/PGM — PORTB bit 5 / ICSP low-voltage prog |
| Pin 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 40 | RB7/PGD — PORTB bit 7 / ICSP data |
Typical Applications
PIC18F4220-I/P is suitable for 7 applications: Industrial Control and Automation, Sensor Interface Nodes, Small Appliance and White Goods Control, HVAC and Climate Controllers, Low-Cost Data Acquisition Modules, Battery-Powered Handheld Instruments, Automotive Body Electronics (Non-Safety).
Industrial Control and Automation
The PIC18F4220-I/P suits industrial controllers because of its 36 I/O count and 10 MIPS throughput, which can read multiple sensor inputs while driving relays or triacs without offloading. The 10-bit ADC with 13 channels interfaces directly to thermocouple/PT100 front-ends and 4-20 mA loops via signal conditioning. nanoWatt sleep modes reduce power during idle scans, and the wide 2.0-5.5 V supply tolerates industrial 24 V rails after regulation. Pair with a 4N35 optocoupler and a ULN2003A driver for isolated AC outputs.
Recommended
Sensor Interface Nodes
The PIC18F4220-I/P is an efficient sensor node controller thanks to its 10-bit ADC, three 16-bit timers, and SPI/I2C/UART connectivity that aggregate multiple sensor types into a single MCU. The Enhanced USART interfaces with RS-485 transceivers (e.g., MAX485) for networked nodes, while the MSSP handles I2C sensors like accelerometers or temperature chips. nanoWatt sleep at sub-1 uA enables multi-year battery life when polling sensors periodically. The 40-PDIP package simplifies through-hole prototyping for low-volume sensor hubs.
Recommended
Small Appliance and White Goods Control
The PIC18F4220-I/P drives white-goods controllers because its 36 I/O with 25 mA source/sink directly switches LED indicators and triac gate drivers, while two CCP PWM modules generate dimmer and motor-speed control signals. The 10-bit ADC reads push-button resistor ladders and NTC thermistors for temperature regulation, and brown-out reset plus watchdog timer protect against supply glitches in motor-driven loads. The industrial temperature grade -40C to +85C covers kitchen and laundry environments with margin.
Recommended
HVAC and Climate Controllers
The PIC18F4220-I/P is well-matched to HVAC thermostats because its nanoWatt technology drops sleep current to sub-1 uA on battery-backed thermostats while still supporting 10-bit ADC scans of NTC sensors. Two analog comparators provide zero-cross detection for triac dimming of fan speeds, and the 36 I/O handles a multi-key keypad, LCD module, and relay outputs simultaneously. Hardware multiply speeds up the proportional-integral climate control loop without offloading to a DSP, and the 4 KB Flash fits typical thermostat firmware comfortably.
Recommended
Low-Cost Data Acquisition Modules
The PIC18F4220-I/P anchors low-cost DAQ modules because its 10-bit ADC samples 13 channels at rates sufficient for slow process signals (temperature, pressure, flow) and its 512-byte RAM buffers local packets before UART upload. The PIC18F family instruction set with hardware multiply enables calibration math on-chip, eliminating an external math chip. Its 2.0-5.5 V operating range works with single-cell Li-ion or 3.3 V regulated rails, and the 40-PDIP package makes the design breadboard-friendly for educational labs.
Recommended
Battery-Powered Handheld Instruments
The PIC18F4220-I/P is appropriate for battery-powered handhelds because its nanoWatt sleep modes plus selectable run/idle oscillator options let the firmware tune energy per task, extending battery life across weeks of standby. The 10 MIPS throughput handles pulse counting from sensor front-ends while the 16-bit timers capture event timestamps accurately. The 2.0-5.5 V supply works directly from two AA cells in series without a boost converter, and the 40-PDIP simplifies hand-soldered prototype builds for low-volume industrial test gear.
Recommended
Automotive Body Electronics (Non-Safety)
The PIC18F4220-I/P is suitable for non-safety automotive body modules such as lighting controllers, seat-position memory, and accessory multiplexers, thanks to its industrial temperature grade and robust ESD/EMI tolerance. The MSSP SPI/I2C bus interfaces to motor driver chips and LED controllers, while the 36 I/O count addresses relay coils and switch scan matrices without a port expander. Brown-out reset and watchdog timer handle load-dump and cranking-voltage disturbances typical of 12 V automotive systems. Choose -E grade for under-hood applications.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F4220-I/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F4221-I/P | PIC18F4220-E/P | PIC18F4520-I/P | PIC18F4620-I/P | PIC18F4321-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-PDIP | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same |
| Flash Program Memory | 4 KB (2K x 16) | 8 KB (4K x 16) | 4 KB (2K x 16) | 32 KB (16K x 16) | 64 KB (32K x 16) | 8 KB (4K x 16) |
| RAM | 512 bytes | 768 bytes | 512 bytes | 1.5 KB | 3.9 KB | 512 bytes |
| Max Clock Speed | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) |
| I/O Pins | 36 | 36 | 36 | 36 | 36 | 36 |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +125C (Extended) | -40C to +85C | -40C to +85C | -40C to +85C |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
Key Differentiators
- Direct upgrade path within the same 40-PDIP footprint (vs PIC18F4221-I/P)
- Extended temperature option for harsh environments (vs PIC18F4220-E/P)
- Massive Flash upgrade for code-intensive applications (vs PIC18F4520-I/P)
Design Notes
The PIC18F4220-I/P requires VDD decoupling within 0.5 inch of pins 11 and 32; place a 0.1 uF ceramic in parallel with a 10 uF tantalum or aluminum bulk cap. For battery-powered designs, the nanoWatt sleep current drops to less than 1 uA when the system clock is halted - ensure WDT is enabled with its dedicated internal RC oscillator for wake-up without an external timer. Brown-out reset must be enabled in the configuration registers to prevent Flash corruption during supply droop; the BOR voltage is programmable via CONFIG2L register.
Keep the crystal/oscillator traces (OSC1 pin 13, OSC2 pin 14) short and symmetric, with a ground guard ring around them to minimize EMI coupling into ADC inputs. Place the ICSP programming header (PGC pin 39, PGD pin 40, MCLR pin 1, VDD, VSS) on the board edge with isolation diodes or series resistors if the application runs at high voltage, to allow in-circuit reprogramming without removing the device. The 40-PDIP package is through-hole; use a socket for prototype iteration to allow rapid part swaps between PIC18F4220/4221/4520/4620 variants.
Do not leave unused I/O pins floating on the PIC18F4220-I/P - configure them as outputs or enable the internal weak pull-ups via the RBPU bit, or they may draw tens of microamps of shoot-through current in the CMOS input stage. When using the MSSP in I2C mode, ensure SDA/SCL lines have pull-up resistors (typically 4.7 kohm at 100 kHz, 2.2 kohm at 400 kHz) - the PIC18F4220 has true open-drain I2C drivers. The ADC input impedance requires the source impedance to be below 2.5 kohm for 10-bit accuracy at full conversion rate; add a sample-and-hold buffer op-amp if your sensor is higher impedance.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - the PIC18F4220 is industrial grade only. Use -E/P (extended temp) grade for automotive non-safety, or migrate to PIC18F family K/L variants for AEC-Q100 qualified parts.
