PIC18LF1220-I/SS - 8-Bit 40MHz 4KB Flash MCU | Microchip
MPN: PIC18LF1220-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.28 | $1.28 |
| 10 | $1.15 | $11.50 |
| 100 | $1.02 | $102.00 |
| 500 | $0.91 | $455.00 |
| 1,000 | $0.81 | $810.00 |
PIC18LF1220-I/SS Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and programmable I/O peripherals. The PIC18 family uses an enhanced 8-bit Harvard-architecture RISC core with 16-bit instructions, sitting in the product hierarchy as: microcontroller -> embedded processor -> semiconductor IC. The 'LF' suffix indicates the low-voltage (2.0V-5.5V) process variant, while 'F' denotes Flash program memory. The 'I' in the part number indicates the industrial temperature range (-40C to +85C), and '/SS' designates the 20-pin SSOP (Shrink-Small-Outline-Package) surface-mount package.
Key features include nanoWatt Technology with six power-managed modes for ultra-low standby current, an enhanced 10-bit ADC with multiple channels, an enhanced USART module, two CCP modules for PWM/capture/compare, and 16 I/O pins with high-current sink/source (25 mA per pin). The 256-byte RAM and 4KB Flash are sufficient for small control loops, sensor interfaces, and protocol bridges, while the 40 MHz instruction cycle provides 10 MIPS of throughput.
Typical applications span consumer appliances, sensor signal conditioning, industrial control peripherals, low-power remote controls, and battery-powered instrumentation. The wide 2.0V-5.5V input range enables direct connection to 2xAA batteries, single Li-Ion cells (3V-4.2V), and 5V rails. Sixteen source/touch outputs are sufficient for matrix LED displays, multi-channel motor or solenoid drivers via external transistors, and protocol bridging via USART/I2C/SPI peripherals.
Design consideration: a single 0.1uF ceramic decoupling capacitor close to VDD is mandatory, and an external pull-up on MCLR is recommended. The PIC18LF1220 is pin-compatible with the standard PIC18F1220, allowing code and PCB reuse between the LF low-voltage variant and the F standard variant.
Drop-in alternatives for PIC18LF1220-I/SS — 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 PIC18LF1220-I/SS (same form factor and footprint) — differing in Package, ADC, Program Memory (Flash), CPU Core, Power-Saving Modes.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F1220-I/SS
✅ Drop-In✓ In Stock
$2.18 / Unit
View Datasheet →PIC18LF1320-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF1220T-I/SS
✅ Drop-In✓ In Stock
$2.18 / Unit
View Datasheet →PIC18F1320-I/SS
✅ Drop-In✓ In Stock
$0.89 / Unit
View Datasheet →PIC18LF1220-I/P
✅ Drop-In✓ In Stock
$2.17 / Unit
View Datasheet →PIC18LF1220-I/SS Maximum Ratings & Electrical Characteristics
| Core | PIC18 (8-bit RISC) |
| Program Memory (Flash) | 4 KB (2K x 16) |
| RAM | 256 bytes |
| EEPROM | 256 bytes |
| Maximum Clock Frequency | 40 MHz |
| Instruction Throughput | 10 MIPS |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 16 |
| ADC | 10-bit, 7 channels |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Package | 20-pin SSOP (Shrink Small Outline) |
| Mounting Type | Surface Mount |
| Standby Current | 100 nA typical (nanoWatt) |
| RoHS Status | Compliant |
| MSL Level | MSL 1 |
PIC18LF1220-I/SS 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 — PORTA bit 2 / Analog input channel 2 |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input channel 3 / ADC positive reference |
| Pin 6 | RA4/AN4/T0CKI — PORTA bit 4 / Analog input channel 4 / Timer0 clock input |
| Pin 7 | RA5/AN5/SS/HLVDIN — PORTA bit 5 / Analog input channel 5 / SPI slave select / High/Low voltage detect input |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKI1/RA7 — Crystal oscillator input / external clock input / PORTA bit 7 |
| Pin 10 | OSC2/CLKO/RA6 — Crystal oscillator output / clock output / PORTA bit 6 |
| Pin 11 | RC0/T1OSO/T13CKI — PORTC bit 0 / Timer1 oscillator output / Timer1/Timer3 clock input |
| Pin 12 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / Capture/Compare/PWM 2 |
| Pin 13 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM 1 |
| Pin 14 | RC3/SCL/SCK — PORTC bit 3 / I2C clock / SPI clock |
| Pin 15 | RC4/SDA/SDI — PORTC bit 4 / I2C data / SPI data in |
| Pin 16 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 17 | RC6/TX/CK — PORTC bit 6 / USART asynchronous transmit / USART synchronous clock |
| Pin 18 | RC7/RX/DT — PORTC bit 7 / USART asynchronous receive / USART synchronous data |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage (2.0V to 5.5V) |
Typical Applications
PIC18LF1220-I/SS is suitable for 7 applications: Battery-Powered Sensor Node, Industrial Control Peripheral, Consumer Remote Control, LED Lighting Controller, Automotive Body Electronics, IoT Edge Sensor Interface, Hobbyist and Educational MCU Platform.
Battery-Powered Sensor Node
The PIC18LF1220-I/SS is well suited to battery-powered sensor nodes that demand years of standby life and modest active-mode throughput. Its 100 nA Sleep current from nanoWalt Technology extends 2xAA cell life well beyond 5 years at low duty cycles, while the 2.0V-5.5V range supports end-of-life cell voltage without boost converters. The 16 I/O pins can directly drive analog sensors via the 10-bit ADC and bit-banged or hardware I2C peripherals, while the 4KB Flash accommodates small protocol stacks. Placed on a coin-cell or 2xAA board with a 0.1uF decoupling cap, the IC draws only active current during wake events. Trade-off: 4KB Flash limits firmware complexity versus larger PIC18 variants.
Recommended
Industrial Control Peripheral
For industrial peripherals such as relay drivers, opto-isolated inputs, and motor-control interfaces, the PIC18LF1220-I/SS offers 16 I/O with 25 mA sink/source, 2xCCP for PWM/timing, and a 10-bit ADC for analog feedback. The industrial -40C to +85C operating range meets factory-floor demands without thermal management. Its 40 MHz / 10 MIPS throughput handles real-time control loops such as PID or stepper commutation. Industrial 24V rails are stepped down via external regulators, with the 2.0V-5.5V range allowing direct regulation to 3.3V or 5V from intermediate rails. The 4KB Flash fits compact state machines and protocol converters used on PLC backplanes.
Recommended
Consumer Remote Control
Handheld remote controls for TVs, set-top boxes, and HVAC systems benefit from the PIC18LF1220-I/SS's nanoWalt Technology, which keeps Sleep current at 100 nA to extend coin-cell life beyond the product's shelf life. The 2.0V-5.5V range supports CR2032 coin cells directly without boost converters, while the 4KB Flash fits IR/RF protocol libraries (RC5, NEC, proprietary). PWM output drives an IR LED at carrier frequency, and timer-capture measures incoming signals for learning remotes. Trade-off: no native USB or wireless, so external MCUs/transceivers are needed for advanced connectivity.
Recommended
LED Lighting Controller
LED strip and decorative lighting controllers leverage the PIC18LF1220-I/SS's two CCP modules for multi-channel PWM dimming, 10-bit ADC for ambient-light sensing feedback, and 16 I/O for addressable LED data lines. The 40 MHz throughput supports driving WS2812B / NeoPixel chains at 800 kHz with deterministic timing from a single CCP channel. Low-voltage 2.0V-5.5V support enables direct regulation from 5V LED rails, simplifying power tree. Trade-off: 4KB Flash fits color-cycle programs but constrains complex lighting effects versus higher-memory PIC18 variants.
Recommended
Automotive Body Electronics
For non-safety automotive body modules such as interior lighting, window controllers, and HVAC actuators, the PIC18LF1220-I/SS operates across the automotive 12V battery range when paired with an external LDO. The -40C to +85C industrial temperature range covers cabin environments. CCP/PWM channels drive motor or valve actuators, ADC inputs read potentiometer position, and 4KB Flash fits small state machines. Trade-off: this part is not AEC-Q100 qualified; for safety-critical or under-hood applications choose a PIC18 K-series or PIC18F-Q variant. Otherwise the LF low-voltage MCU is cost-effective for cabin-tier body modules.
Recommended
IoT Edge Sensor Interface
IoT edge sensor interfaces benefit from the PIC18LF1220-I/SS's compact 20-SSOP footprint, nanoWatt standby, and moderate MIPS, allowing the device to bridge analog/digital sensors to upstream MCUs via I2C/SPI/UART. The 7-channel 10-bit ADC reads multiple analog sensors, and USART transmits packets to a parent processor or wireless module. The 2.0V-5.5V supply range enables direct battery operation. Trade-off: 4KB Flash limits on-device protocol stacks versus higher-tier PIC18F variants, so this MCU is best for simple sensor front-ends rather than full IoT nodes with TCP/IP stacks.
Recommended
Hobbyist and Educational MCU Platform
The PIC18LF1220-I/SS is widely adopted in universities and hobbyist electronics because of Microchip's free MPLAB X IDE, XC8 compiler, and a large ecosystem of application notes, training videos, and PICkit programmers. The 20-pin SSOP package is breadboard-friendly via SSOP-to-DIP breakouts, and the 4KB Flash provides enough space for introductory projects such as blinking LEDs, PWM motor drives, ADC sampling, and I2C peripheral exercises. The PIC18 instruction set is well documented and the family is taught in many EE curricula. Trade-off: SSOP is harder to hand-solder than the PDIP variant for educational kits.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF1220-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F1220-I/SS | PIC18LF1320-I/SS | PIC18LF1220T-I/SS | PIC18F1320-I/SS | PIC18LF1220-I/P |
|---|---|---|---|---|---|---|
| Package | 20-pin SSOP | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin PDIP (not SSOP) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 4 KB | 4 KB | 8 KB (+100%) | 4 KB | 8 KB (+100%) | 4 KB |
| RAM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Max Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Operating Voltage | 2.0V to 5.5V (LF) | 2.0V to 5.5V (F) | 2.0V to 5.5V (LF) | 2.0V to 5.5V (LF) | 2.0V to 5.5V (F) | 2.0V to 5.5V (LF) |
| I/O Pins | 16 | 16 | 16 | 16 | 16 | 16 |
| Process / Suffix | LF (low-voltage) | F (standard) | LF (low-voltage) | LF + T&R packing | F (standard) | LF (low-voltage) |
Key Differentiators
- Low-voltage (LF) process variant optimized for battery-powered designs
- Pin-to-pin compatibility with the 8KB Flash PIC18LF1320-I/SS
- SSOP surface-mount package option for compact designs
Design Notes
Place a 0.1uF ceramic decoupling capacitor as close as possible to the VDD pin (pin 20) with the ground return connected to the VSS pin (pin 19) using short, wide traces. For designs that toggle heavy loads or use analog references, add a 10uF bulk capacitor on the VDD rail. The PIC18LF1220's nanoWalt Technology achieves 100 nA Sleep current only when the MCLR pin is held high (not floating) and the watchdog timer is disabled, per Microchip datasheet DS39602D.
The 20-pin SSOP package has a 0.65 mm pitch, requiring careful PCB layout for hand-soldering; use hot air rework or reflow soldering rather than iron soldering for production. Tie the MCLR pin (pin 1) to VDD through a 10k pull-up resistor and add a 100nF cap to ground for hardware-reset debouncing. Keep the oscillator traces (OSC1/OSC2) short and surround them with a ground pour to minimize EMI coupling into adjacent analog inputs.
Do not leave MCLR floating - a floating MCLR pin causes random resets and erratic behavior. Always use a 10k pull-up to VDD. For ADC accuracy, add adequate acquisition time and use the ADC RC modeling guidance in datasheet section 16.2. When migrating between the LF (low-voltage) and F (standard) process variants, re-validate timing parameters at the actual operating voltage since the LF variant has reduced maximum frequency at VDD < 4.5V per Microchip datasheet DS39602D derating curves.
Route the I2C lines (RC3/SCL, RC4/SDA) with short, parallel traces and place 4.7k pull-up resistors close to the MCU side rather than at the peripheral side for clean signal edges. If using SPI at high speeds, route MOSI/MISO/CS in matched-length traces and avoid routing parallel to switching signals. Reserve RC0/RC1 (T1OSO/T1OSI) for low-frequency 32 kHz crystal operation if real-time clock accuracy is required.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - this part is targeted at industrial/consumer applications, not automotive safety-critical use.
