PIC18F1220T-I/SS - 8-Bit MCU, 4KB Flash, 16 I/O, SSOP-20 | Microchip
MPN: PIC18F1220T-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.6 | $3.60 |
| 10 | $3.2 | $32.00 |
| 100 | $2.78 | $278.00 |
| 500 | $2.45 | $1,225.00 |
| 1,000 | $2.18 | $2,180.00 |
PIC18F1220T-I/SS Overview
A PIC microcontroller is a programmable, single-chip computer built around Harvard architecture - separate program and data buses - and executes one instruction per clock cycle. PIC18F devices sit in Microchip's high-performance 8-bit family, above the legacy PIC16 baseline. PIC18F1220T-I/SS integrates 4 KB flash, 256 B SRAM, 16 digital I/O, a 10-bit ADC, and nanoWatt power management in a compact 20-pin SSOP. This combination targets cost-sensitive embedded applications where 32-bit MCUs are over-spec but more capability than a PIC16 is needed.
Key features include nanoWatt Technology with six software-controlled power-managed modes and standby current as low as 0.1 uA, a 10-bit ADC, an internal 31 kHz to 8 MHz oscillator, and an enhanced flash memory with 100,000 erase/write cycles typical endurance. The 10-bit A/D converter offers 7 input channels with acquisition time programmable in 16 levels. An integrated brown-out reset (BOR), watchdog timer, in-circuit serial programming (ICSP), and an 8x8 hardware multiplier round out the peripheral set.
Architecturally, the PIC18F1220T-I/SS uses an enhanced 8-bit data path with 16-bit instructions (RISC), 31-level hardware stack, and DC-40 MHz oscillator with 4x PLL option (selectable PLL modes). Two 8-bit timers/counters and one 16-bit timer/counter deliver event timing. Instruction execution throughput is 200 ns at 20 MHz or 100 ns at 40 MHz, which translates to 10 MIPS peak - more than 5x the throughput of a baseline PIC16 at the same clock.
Typical applications include battery-powered sensor nodes, low-cost consumer devices, industrial control loops, automotive interior accessories (PIC18F1220-I/SS is the base; Q-grade parts target automotive), and any product needing a small, low-power MCU with on-chip ADC. It is also widely used as a drop-in upgrade for older PIC16 designs needing more code space and peripherals.
Design consideration: the SSOP-20 footprint requires careful PCB layout because the 0.65 mm lead pitch demands reflow profile within JEDEC J-STD-020 guidelines and adequate via-in-pad or thermal relief to avoid solder joint fatigue.
This page synthesizes distributor pricing, drop-in alternatives (same-brand first, then cross-brand), and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC18F1220T-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 PIC18F1220T-I/SS (same form factor and footprint) — differing in Package, Timers, A/D Converter, Internal Oscillator, Maximum CPU Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F1220-I/SS
✅ Drop-In✓ In Stock
$2.18 / Unit
View Datasheet →PIC18F1320T-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F1220-E/SS
✅ Drop-In✓ In Stock
$2.84 / Unit
View Datasheet →PIC18LF1220T-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F1220-H/SS
✅ Drop-In✓ In Stock
$2.18 / Unit
View Datasheet →PIC18F1220T-I/SS Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit PIC18 RISC Microcontroller (MCU) |
| Program Memory (Flash) | 4 KB (2K x 16) |
| RAM | 256 bytes |
| Data EEPROM | 256 bytes (typical for PIC18F1xxx family) |
| Maximum CPU Speed | 40 MHz (DC), up to 10 MIPS |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| Operating Temperature | -40 C to +85 C (Industrial grade) |
| Digital I/O Pins | 16 |
| A/D Converter | 10-bit, 7 channels (multiplexed) |
| Timers | 2 x 8-bit, 1 x 16-bit |
| Standby Current (nanoWatt) | 0.1 uA typical |
| Package | 20-pin SSOP (5.30 mm body) |
| Mounting Type | Surface Mount (tape and reel) |
| MSL Level | 1 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Internal Oscillator | Yes, 31 kHz to 8 MHz |
PIC18F1220T-I/SS Pin Configuration
| Pin 1 | RA2/AN2/VREF-/CVREF — Digital I/O RA2; ADC channel 2; VREF- input; comparator reference output |
| Pin 2 | RA3/AN3/VREF+ — Digital I/O RA3; ADC channel 3; VREF+ input |
| Pin 3 | RA4/AN4/C1OUT/T0CKI — Digital I/O RA4; ADC channel 4; comparator 1 output; Timer0 clock input |
| Pin 4 | RA5/AN5/SS/HLVDIN — Digital I/O RA5; ADC channel 5; SPI slave select; HLVD input |
| Pin 5 | GND — Ground reference |
| Pin 6 | OSC1/RA7/CLKIN — External clock in / oscillator pin; alt-function port RA7 |
| Pin 7 | OSC2/RA6/CLKOUT — Oscillator output; alt-function port RA6; clock out |
| Pin 8 | RC0/T1OSO/T1CKI — Digital I/O RC0; Timer1 oscillator output / clock input |
| Pin 9 | RC1/CCP2 — Digital I/O RC1; CCP2 peripheral output |
| Pin 10 | RC2/CCP1/P1A — Digital I/O RC2; CCP1 PWM output |
| Pin 11 | RC3/SCK/SCL — Digital I/O RC3; SPI clock / I2C clock |
| Pin 12 | RC4/SDI/SDA — Digital I/O RC4; SPI data in / I2C data |
| Pin 13 | RC5/SDO — Digital I/O RC5; SPI data out |
| Pin 14 | RC6/TX/CK — Digital I/O RC6; EUSART TX / clock |
| Pin 15 | RC7/RX/DT — Digital I/O RC7; EUSART RX / data |
| Pin 16 | VSS — Secondary ground return (digital IO VSS return) |
| Pin 17 | VDD — Positive supply (2.0 V to 5.5 V) |
| Pin 18 | MCLR/VPP/RE3 — Master Clear reset; programming high voltage; port RE3 |
| Pin 19 | RA0/AN0 — Digital I/O RA0; ADC channel 0 |
| Pin 20 | RA1/AN1 — Digital I/O RA1; ADC channel 1 |
Typical Applications
PIC18F1220T-I/SS is suitable for 6 applications: Battery-Powered Sensor Nodes, Industrial Control Loops, Low-Cost Consumer Devices, Automotive Interior Accessories, IoT Edge Devices and Sensor Hubs, Educational and Hobby Embedded Projects.
Battery-Powered Sensor Nodes
The PIC18F1220T-I/SS is ideal for wireless sensor nodes because its nanoWatt Sleep current drops to 0.1 uA typical per Microchip datasheet DS39605, letting a 100 mAh coin cell run for years. Its 4 KB flash holds small sensor-fusion firmware, while the 10-bit ADC with 7 channels reads temperature, light, and voltage rails without external ADC parts. The 2.0-5.5 V VDD range covers both 3.3 V coin-cell and 5 V industrial sensors directly. At a 10 MIPS peak, the core can wake, sample, average, and transmit before returning to Sleep within tens of milliseconds. This combination delivers multi-year battery life at sub-$3 BOM.
Recommended
Industrial Control Loops
The PIC18F1220T-I/SS suits small industrial control loops with 16 digital I/O to drive relays, optocouplers, and indicator LEDs directly from one SSOP-20 footprint. Its 40 MHz (10 MIPS) throughput can run a closed-loop PID at kilohertz rates, while the industrial -40 C to +85 C grade meets IEC 61131 environmental envelopes. The 10-bit ADC with 7 channels accepts 4-20 mA loops after resistor conditioning, and the nanoWatt Idle mode cuts standby power between bursts. Designers often pair it with digital isolators and a watchdog supervisor for safety system compliance without needing a separate MCU.
Recommended
Low-Cost Consumer Devices
With 4 KB flash and a 20-pin SSOP costing under USD 3 in qty 100 (DigiKey 530244, Sept 2026), the PIC18F1220T-I/SS is a strong choice for toy, appliance, and hobby MCU roles where cost dominates. Its 16 digital I/O drive buttons, LEDs, and buzzer drivers; the 10-bit ADC reads simple knobs and potentiometers. Tutorial-grade C compilers and Microchip's MPLAB X IDE shorten firmware development for design teams new to PIC18. Wide 2.0-5.5 V supply compatibility means the same BOM can ride either 3.3 V or 5 V coin-cell outputs without redesign.
Recommended
Automotive Interior Accessories
For automotive non-safety interior modules, the PIC18F1220T-I/SS handles HVAC controls, ambient lighting, and dashboard LED drivers thanks to industrial -40 to +85 C operation and a stable Microchip supply line. Its 16 I/O PWM-able outputs (via CCPR module) drive LED chasers and motor H-bridges - common in seat, mirror, and lighting subsystems. The PIC18 architecture's mature toolchain (MPLAB X) and long product lifecycle (10+ years) suit automotive 5-year design cycles. For under-hood or CAN/LIN bus nodes, designers prefer the Q-grade and dsPIC families for their CAN/LIN hardware and wider operating range.
Recommended
IoT Edge Devices and Sensor Hubs
The PIC18F1220T-I/SS anchors a low-cost IoT edge node by aggregating local sensors over the 10-bit ADC and forwarding via UART or SPI to a downstream ESP32, LoRa, or BLE module. With only 16 I/O it does not run TCP/IP locally, but its low cost (USD ~2.18 in qty 1000 per DigiKey Sept 2026) keeps bill-of-materials tight. Its nanoWatt modes make intermittent-sample patterns practical, and 4 KB flash holds typical sensor-fusion pre-processing. Often deployed as an SLAVE MCU beside a wireless chip, mirroring a pattern seen in PLC analog front-ends.
Recommended
Educational and Hobby Embedded Projects
PIC18F1220T-I/SS is widely used in university embedded systems courses because Microchip's MPLAB X IDE, XC8 compiler, and PICkit 4 programmer are free and well-documented. The 20-pin SSOP footprint breaks out cleanly to 0.1" headers on a development board, exposing 16 I/O plus ADC and PWM for student projects. With 4 KB flash and 256 B RAM students can run real C programs including interrupts and timers in a single semester. The PIC18's 75+ instructions and Harvard architecture provide a deeper teaching moment than an Arduino's stripped-down loop. Components under USD 3 encourage stocking for lab kits.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F1220T-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F1220-I/SS | PIC18F1320T-I/SS | PIC18F1220-E/SS | PIC18LF1220T-I/SS | PIC18F1220-H/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SSOP-20 | SSOP-20 | SSOP-20 | SSOP-20 | SSOP-20 | SSOP-20 |
| Program Memory (Flash) | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| RAM | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C | -40 C to +85 C | -40 C to +85 C + derating |
| Max CPU Speed | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 32 MHz typical (LF variant) | 40 MHz / 10 MIPS |
| VDD Range | 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 | 1.8 V to 3.6 V (LF variant) | 2.0 V to 5.5 V |
| Packaging Format | Tape & Reel | Tube | Tape & Reel | Tube or T&R | Tape & Reel | Tube or T&R |
| Standby Current (nanoWatt Sleep) | 0.1 uA typical | 0.1 uA typical | 0.1 uA typical | 0.1 uA typical | 0.1 uA typical (lower VDD further reduces it) | 0.1 uA typical |
Key Differentiators
- Industrial temperature grade in tape-and-reel pack-out (vs PIC18F1220-I/SS)
- Modern PIC18 architecture with Enhanced Flash and nanoWatt modes (vs PIC16F877A-I/PT)
- Wide supply voltage flexibility (vs PIC18F1220T-I/SS (vs PIC18LF1220T-I/SS))
Design Notes
The SSOP-20 footprint has a 0.65 mm lead pitch that demands careful PCB layout. Use JEDEC J-STD-020 compliant reflow profiles (peak 260 C, 60-90 s above 220 C). Place a 100 nF decoupling capacitor within 3 mm of VDD (pin 17) and a 10 uF bulk cap on the same rail to handle PIC wake-up surges. Avoid routing RF or motor-drive traces parallel to the SSOP pin escape; the narrow 0.65 mm leads limit clearances and risk solder bridging if flux residue accumulates between adjacent pads.
PIC18F1220T-I/SS supports VDD from 2.0 V to 5.5 V, but the brown-out reset (BOR) default threshold is 4.2 V minimum - enable BOR in configuration bits for robust 5 V rail operation. Estimate: at 40 MHz and 5 V, ICC is approximately 16 mA during Active mode (per datasheet DS39605 DC characteristics), dropping to 0.1 uA in Sleep. Use nanoWatt Idle modes for RAM-retentive standby, and reserve Sleep only when full CPU context restore is acceptable on wake.
A frequent design mistake is forgetting to disable the analog peripheral on digital I/O pins: RA0, RA1, and RA2 default to ADC channels, so reading PORTA without clearing ANCON bits turns an unused ADC pin into a floating input. Always configure ANCON, CMCON, and CVRCON at firmware start to free up the 16 I/O you expect. Also ensure ICSPDAT/ICSPCLK pins (typically RB6/RB7 - here mapped to RA6/RA7) are not used as outputs during programming since PICKit 4 forces the order at reset.
Compliance Information
RoHS compliant per Microchip product page. AEC-Q100 not qualified - choose AEC-Q100-grade parts (e.g., PIC18F1220-E/SS or Q-suffixed variants) for automotive. Lead-free and halogen-free per Microchip 2026 product statements.
