PIC18F1220-H/SO - 8-bit 25MHz 4KB Flash MCU | Microchip
MPN: PIC18F1220-H/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.35 | $3.35 |
| 10 | $3.02 | $30.20 |
| 100 | $2.68 | $268.00 |
| 500 | $2.41 | $1,205.00 |
| 1,000 | $2.15 | $2,150.00 |
PIC18F1220-H/SO Overview
A microcontroller is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and a rich set of peripherals (timers, ADC, communication ports, GPIO) into one package. Within the PIC18 family from Microchip Technology, the PIC18F1220 sits at the low-pin-count end of the high-performance enhanced-Flash line, sitting below the PIC18F1320 and above the base PIC16F series. It is engineered for cost-sensitive, deterministic embedded control where an 8-bit architecture, small footprint, and low power consumption matter more than raw MIPS.
Key features include an enhanced 16-bit instruction set with 75 instructions and an 8 x 8 hardware multiplier, self-programmability for in-field firmware upgrades, an ICD (In-Circuit Debug) interface, capture/compare/PWM modules, 7 channels of 10-bit Analog-to-Digital conversion, an Addressable USART (AUSART), and advanced low-power modes controlled by Microchip's nanoWatt Technology. The 18-SOIC (0.295 inch / 7.50 mm body) gives designers a widely available, easy-to-protoboard package.
Architecture-wise, the PIC18F1220 uses a 14-bit-wide Flash path and a 16-bit instruction word that yields an 8 MIPS throughput at 25 MHz (4-clock-per-instruction pipeline). Peripherals share the same interrupt vector with priority levels and a software-selectable oscillator source (internal RC, external crystal, HS, or EC modes), simplifying BOM cost when an external crystal can be eliminated entirely.
Typical applications include automotive body and chassis modules, HVAC and climate controls, small appliance motor control (CCP/PWM-driven), sensor signal conditioning with the 10-bit ADC, low-cost user-interface controllers, and battery-powered industrial sensors. The high-temp H grade opens under-hood, white-goods, and outdoor equipment markets that the I-grade PIC18F1220-I/SO cannot address.
When designing with this part, choose decoupling capacitors per the datasheet (typically 100 nF on VDD plus a bulk 10 uF) and pay attention to the ICSP/ICD pin sharing to avoid contention with the application circuit. The Flash endurance is rated at 100K cycles minimum, so EEPROM emulation should be reserved for rarely-changed parameters.
This page synthesizes distributor pricing, drop-in alternatives drawn from the same Microchip PIC18 family, and practical design notes that complement rather than copy the manufacturer datasheet, helping procurement and engineering teams quickly decide whether the PIC18F1220-H/SO is the right MCU for their BOM.
Drop-in alternatives for PIC18F1220-H/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 PIC18F1220-H/SO (same form factor and footprint) — differing in Package, Core Architecture, Operating Temperature Range, Program Memory (Flash), Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F1220-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F1220-E/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F1220-E/P
✅ Drop-In✓ In Stock
$2.95 / Unit
View Datasheet →PIC18F1220-H/SO Maximum Ratings & Electrical Characteristics
| Manufacturer | Microchip Technology |
| Series | PIC 18F |
| Core | PIC18 (8-bit RISC) |
| Maximum Clock Speed | 25 MHz |
| Program Memory Size | 4 KB (2K x 16) Flash |
| RAM Size | 256 bytes |
| EEPROM Size | 128 bytes |
| Number of I/O Pins | 16 |
| ADC | 10-bit, 7 channels |
| Communication | AUSART (Addressable USART) |
| Timers/CCP | Capture/Compare/PWM modules |
| Supply Voltage | 4.2 V to 5.5 V |
| Operating Temperature | -40C to +150C (H grade) |
| Package | 18-SOIC (0.295 inch / 7.50 mm body) |
| Mounting Type | Surface Mount |
| Oscillator | Internal + External crystal/HS/EC modes |
| Self-Programming | Yes |
| In-Circuit Debug | Yes (ICD) |
| RoHS Status | Compliant |
PIC18F1220-H/SO Pin Configuration
| Pin 1 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Pin 2 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Pin 3 | RA2/AN2 — Digital I/O / Analog input channel 2 |
| Pin 4 | RA3/AN3 — Digital I/O / Analog input channel 3 / VREF+ |
| Pin 5 | RA4 — Digital I/O / Timer0 clock input |
| Pin 6 | RA5/MCLR/VPP — Digital I/O / Master Clear (reset) / ICSP programming voltage |
| Pin 7 | VSS — Ground reference |
| Pin 8 | VDD — Positive supply (4.2V to 5.5V) |
| Pin 9 | OSC1/CLKI/RA7 — Crystal oscillator input / external clock input / GPIO |
| Pin 10 | OSC2/CLKO/RA6 — Crystal oscillator output / clock output / GPIO |
| Pin 11 | RC0 — Digital I/O port C |
| Pin 12 | RC1 — Digital I/O port C |
| Pin 13 | RC2 — Digital I/O port C |
| Pin 14 | RC3 — Digital I/O port C |
| Pin 15 | RC4 — Digital I/O port C / AUSART TX |
| Pin 16 | RC5 — Digital I/O port C / AUSART RX |
| Pin 17 | RB6/PGC — Digital I/O port B / ICSP clock |
| Pin 18 | RB7/PGD — Digital I/O port B / ICSP data |
Typical Applications
PIC18F1220-H/SO is suitable for 6 applications: Automotive Under-Hood Control, White-Goods / Appliance Control, Sensor Signal Conditioning, Small-Appliance User Interface, Battery-Powered Industrial Sensor, PWM Motor / Fan Speed Controller.
Automotive Under-Hood Control
The PIC18F1220-H/SO is well-suited to automotive under-hood modules such as HVAC actuators, fan controllers, and sensor signal conditioners because its -40C to +150C operating range comfortably covers the AEC-Q100 Grade 0 envelope. The 25 MHz PIC18 core (8 MIPS) and 7-channel 10-bit ADC deliver deterministic real-time response for closed-loop control loops, while 16 GPIO let a single MCU drive valves, relays, and feedback sensors without external logic. Place decoupling capacitors per datasheet section 2 and ensure the ICSP pin (RB6/RB7) is isolated from high-current load switching to keep in-circuit debug stable.
Recommended
White-Goods / Appliance Control
The PIC18F1220-H/SO's combination of CCP/PWM modules, 7-channel 10-bit ADC, and high-temperature H grade make it a natural fit for washing-machine motor control boards, dishwasher pumps, and oven-display controllers that see sustained thermal stress. The 4 KB Flash holds a small RTOS-free state machine, while 128 B EEPROM stores appliance cycle presets and calibration that survive power cycles. Pin-compatible PIC18F1220-I/SO substitutes can be used on board variants that live on the user-accessible front panel, reducing BOM cost without changing firmware.
Recommended
Sensor Signal Conditioning
The PIC18F1220-H/SO's 10-bit ADC with up to 7 channels, plus its AUSART for transmitting digitized values to a host, suits it for multi-sensor front-end modules in industrial process plants. The PIC18's nanoWatt Technology sleep currents let battery-powered sensor heads last years on a single cell, while the -40C to +150C H grade supports outdoor and cabinet-mounted installations. Designers typically allocate 4 KB Flash for linearization curves, EEPROM for calibration constants, and one CCP channel for sensor excitation PWM.
Recommended
Small-Appliance User Interface
The PIC18F1220-H/SO drives LED indicators, keypads, and small character LCDs in coffee makers, blenders, and countertop ovens where the H grade tolerates the elevated ambient temperatures inside the appliance housing. Its 16 GPIO are sufficient to scan a 4x4 matrix keypad plus 8 status LEDs without an expander, and the CCP module generates a buzzer tone for alerts. The 128-byte EEPROM holds user preferences and last-cycle state through power cycles.
Recommended
Battery-Powered Industrial Sensor
The PIC18F1220-H/SO's nanoWatt Technology sleep modes (under 100 nA typical with full RAM retention per datasheet section 11) let it run from two AA cells for multi-year deployments on factory-floor vibration, temperature, or flow-meter nodes. The AUSART provides a simple interface to wireless modules such as the XAIPART-listed MRF89XA sub-GHz transceiver, while the 10-bit ADC samples sensor outputs on wake-up. The H grade supports unheated outdoor enclosures.
Recommended
PWM Motor / Fan Speed Controller
The PIC18F1220-H/SO drives small DC fans, blowers, and brushless-DC actuators using its Capture/Compare/PWM modules, and the 25 MHz core executes closed-loop PI control loops with sub-millisecond period. The 7-channel 10-bit ADC samples back-EMF or current shunt feedback, while 16 GPIO handle direction, brake, and tachometer signals. The H grade supports under-hood automotive fans and high-ambient industrial cabinets.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F1220-H/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F1220-I/SO | PIC18F1220-E/SO | PIC18F1220-E/P |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC (0.295 in) | 18-SOIC (0.295 in) - same | 18-SOIC (0.295 in) - same | SPDIP-18 (through-hole, same pinout) |
| Operating Temperature | -40C to +150C (H grade) | -40C to +85C (I grade) | -40C to +125C (E grade) | -40C to +125C (E grade) |
| Maximum Clock Speed | 25 MHz | 25 MHz | 25 MHz | 25 MHz |
| Program Memory | 4 KB Flash | 4 KB Flash | 4 KB Flash | 4 KB Flash |
| RAM / EEPROM | 256 B / 128 B | 256 B / 128 B | 256 B / 128 B | 256 B / 128 B |
| Number of I/O | 16 | 16 | 16 | 16 |
| ADC Channels | 10-bit, 7 channels | 10-bit, 7 channels | 10-bit, 7 channels | 10-bit, 7 channels |
| Supply Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V |
| Automotive / High-Temp Grade | Yes (H grade, -40C to +150C) | No (I grade) | Partial (E grade up to +125C) | Partial (E grade up to +125C) |
Key Differentiators
- H temperature grade for automotive under-hood (vs PIC18F1220-I/SO)
- Extended E grade for industrial without H premium (vs PIC18F1220-H/SO)
- Through-hole alternative for hand-soldered prototypes (vs PIC18F1220-E/P)
Design Notes
Place a 100 nF ceramic decoupling capacitor as close as possible to the VDD pin (pin 8) and a 10 uF bulk tantalum or aluminum capacitor nearby, per the PIC18F1220/1320 datasheet section on recommended decoupling. The PIC18 core is sensitive to VDD droop during Flash programming - inadequate decoupling causes intermittent programming failures that look like bad silicon. Add a bulk cap on the analog VDD pin if you separate analog and digital rails.
The MCLR/VPP/RA5 pin (pin 6) is shared between reset, ICSP high-voltage programming, and GPIO. If you use this pin as GPIO, you must provide a robust external pull-up and consider the ICD impact - in-circuit debugging can be blocked by external components on this pin. The ICSP pins RB6/PGC and RB7/PGD (pins 17 and 18) must not be hard-pulled to VDD or VSS by the application circuit, or in-circuit serial programming will fail.
Although the PIC18F1220-H/SO is qualified to +150C junction, the SOIC-18 package has a higher thermal resistance than the SSOP or QFN variants. Estimated: with theta_JA around 100 C/W on a 1-oz 2-layer FR-4 board and 100 mW typical dissipation, the self-heating rise above ambient is roughly 10 C - comfortably inside the H-grade envelope but worth checking in fully sealed under-hood enclosures where no convective cooling is available.
Route the crystal traces (OSC1/OSC2, pins 9 and 10) as short as possible and shield them with a ground pour to reduce EMI pickup, especially if the part is placed near switching power stages. Keep ADC traces (RA0-RA3, AN0-AN3) away from high-current traces and digital switching signals; add a small RC filter on analog inputs if the source impedance exceeds 2.5 kohm to avoid ADC sample-charge errors.
When the AUSART (pins 14 and 15) runs above 115.2 kbaud, terminate the RX line with a small RC filter to suppress ringing on long board traces, and ensure the baud-rate generator error stays below 2.5% to maintain communication integrity. For noisy automotive environments, consider adding external TVS protection on the AUSART lines that leave the module - the internal ESD diodes are rated for 2 kV HBM but not direct automotive transient pulses.
Compliance Information
RoHS compliant per JLCPCB listing. The H temperature grade is commonly used in automotive applications, but AEC-Q100 qualification status should be confirmed against the specific lot via Microchip's PPAP/PCN documentation before designing into a safety-critical automotive module.
