PIC18F43K22-I/MV - 8KB Flash 8-bit MCU 40-UQFN | Microchip
MPN: PIC18F43K22-I/MV ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.65 | $16.50 |
| 100 | $1.42 | $142.00 |
| 500 | $1.21 | $605.00 |
| 1,000 | $1.08 | $1,080.00 |
PIC18F43K22-I/MV Overview
An 8-bit PIC microcontroller is a Harvard-architecture RISC device that combines a deterministic instruction set, integrated analog peripherals, and on-chip non-volatile program memory in a single package. PIC microcontrollers sit at the lowest tier of the embedded controller hierarchy - below 16-bit dsPIC and 32-bit ARM Cortex-M parts - and are valued for their low power, robust peripherals, and free MPLAB X toolchain support. PIC18F-series parts add larger program-memory addressing and C-friendly architecture extensions over the baseline PIC16F family.
Key features of the PIC18F43K22-I/MV include: 8 KB self-programmable Flash, nanoWatt XLP sleep modes (100 nA typical), CTMU charge-time measurement unit for capacitive touch, mTouch capacitive-sensing hardware, a 32 kHz secondary oscillator for low-power timer operation, and a hardware RTCC with calendar. The 10-bit ADC supports automatic acquisition and conversion with up to 28 input channels. The device is in active production and Microchip lists the PIC18F45Q10 as a recommended migration path for new designs.
Typical applications include low-power battery sensors (sub-100 nA sleep), capacitive touch user interfaces (CTMU-based), small appliance controls, automotive body and HVAC modules (industrial grade), USB-to-UART bridges when paired with an external transceiver, and LED lighting controllers. The exposed-pad UQFN-40 footprint suits compact handheld designs where board area is at a premium.
Design with this part by budgeting ADC acquisition time when sampling high-impedance sources, routing the exposed pad to a continuous ground plane for thermal dissipation, and using the CTMU for production-grade capacitive touch in noisy environments. JTAG/ICSP programming requires dedicated pin assignments - reserve those even if you do not use them in production.
This page synthesizes distributor pricing, drop-in alternatives, application guidance, and design notes not consolidated in the manufacturer datasheet alone.
Drop-in alternatives for PIC18F43K22-I/MV — 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 PIC18F43K22-I/MV (same form factor and footprint) — differing in Package, Timers, ADC, Data EEPROM, Comparators.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F43K22T-I/MV
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F45K22-I/MV
✅ Drop-In✓ In Stock
$2.2 / Unit
View Datasheet →PIC18F46K22-I/MV
✅ Drop-In✓ In Stock
$2.95 / Unit
View Datasheet →PIC18F44K22-I/MV
✅ Drop-In✓ In Stock
$1.55 / Unit
View Datasheet →PIC18F43K20-I/MV
✅ Drop-In✓ In Stock
$1.97 / Unit
View Datasheet →PIC18F43K22-I/MV Maximum Ratings & Electrical Characteristics
| Core | PIC18 (8-bit, RISC, Harvard) |
| Maximum Clock Frequency | 64 MHz (16 MIPS) |
| Program Memory (Flash) | 8 KB (4K x 16) |
| Data RAM | 512 bytes |
| Data EEPROM | 256 bytes |
| I/O Pins | 36 |
| ADC | 10-bit, up to 28 channels |
| Analog Comparators | 2 |
| CCP / ECCP Modules | 2 (1 CCP + 1 ECCP) |
| Timers | Timer0, Timer1, Timer2, Timer3 + RTCC |
| UART/USART | 2 (EUSART) |
| SPI | 2 (1 SPI + 1 I2C/SPI) |
| I2C | 1 (MSSP) |
| Supply Voltage | 2.5 V to 5.5 V |
| Operating Temperature | -40C to +85C (industrial) |
| Package | 40-UQFN (MV) 5x5 mm with exposed pad |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC18F43K22-I/MV Pin Configuration
| Pin 1 | RA2/AN2 — Digital I/O / Analog input 2 |
| Pin 2 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / ADC reference + |
| Pin 3 | RA4/AN4/C2OUT — Digital I/O / Analog input 4 / Comparator 2 output |
| Pin 4 | RA5/AN5/C1OUT — Digital I/O / Analog input 5 / Comparator 1 output |
| Pin 5 | RA6/OSC2 — Digital I/O / Oscillator output |
| Pin 6 | RA7/OSC1 — Digital I/O / Oscillator input |
| Pin 7 | VSS — Ground reference |
| Pin 8 | VDD — Positive supply (2.5V-5.5V) |
| Pin 9 | RB0/INT0 — Digital I/O / External interrupt 0 |
| Pin 10 | RB1/INT1 — Digital I/O / External interrupt 1 |
| Pin 11 | RB2/INT2 — Digital I/O / External interrupt 2 |
| Pin 12 | RB3/CTED1 — Digital I/O / CTMU edge 1 |
| Pin 13 | RB4/CTED2 — Digital I/O / CTMU edge 2 |
| Pin 14 | RB5 — Digital I/O |
| Pin 15 | RB6/PGC — Digital I/O / ICSP clock |
| Pin 16 | RB7/PGD — Digital I/O / ICSP data |
| Pin 17 | RC0/SOSCO — Digital I/O / Secondary oscillator output |
| Pin 18 | RC1/SOSCI — Digital I/O / Secondary oscillator input |
| Pin 19 | RC2/CCP1 — Digital I/O / CCP1 PWM output |
| Pin 20 | RC3/REFO/SCL — Digital I/O / Reference output / I2C clock |
| Pin 21 | RC4/SDA — Digital I/O / I2C data |
| Pin 22 | RC5/SDO — Digital I/O / SPI data out |
| Pin 23 | RC6/TX1/CK1 — Digital I/O / UART1 TX / clock |
| Pin 24 | RC7/RX1/DT1 — Digital I/O / UART1 RX / data |
| Pin 25 | RE3/MCLR — Master clear / programming voltage |
| Pin 26 | RD0/AD0/PSP0 — Digital I/O / Analog input 0 / Parallel slave port 0 |
| Pin 27 | RD1/AD1/PSP1 — Digital I/O / Analog input 1 / PSP1 |
| Pin 28 | RD2/AD2/PSP2 — Digital I/O / Analog input 2 / PSP2 |
| Pin 29 | RD3/AD3/PSP3 — Digital I/O / Analog input 3 / PSP3 |
| Pin 30 | RD4/AD4/PSP4 — Digital I/O / Analog input 4 / PSP4 |
| Pin 31 | RD5/AD5/PSP5 — Digital I/O / Analog input 5 / PSP5 |
| Pin 32 | RD6/AD6/PSP6 — Digital I/O / Analog input 6 / PSP6 |
| Pin 33 | RD7/AD7/PSP7 — Digital I/O / Analog input 7 / PSP7 |
| Pin 34 | VSS — Ground reference |
| Pin 35 | VDD — Positive supply (2.5V-5.5V) |
| Pin 36 | RF0/AN6 — Digital I/O / Analog input 6 |
| Pin 37 | RF1/AN7 — Digital I/O / Analog input 7 |
| Pin 38 | RF2/AN8 — Digital I/O / Analog input 8 |
| Pin 39 | RF3/AN9 — Digital I/O / Analog input 9 |
| Pin 40 | RF4/AN10 — Digital I/O / Analog input 10 |
Typical Applications
PIC18F43K22-I/MV is suitable for 6 applications: Battery-Powered Wireless Sensor Nodes, Capacitive Touch User Interfaces, Small Appliance and White-Good Controls, Automotive Body and HVAC Modules, USB-to-UART Bridge and Serial Adapters, LED Lighting Controllers and Drivers.
Battery-Powered Wireless Sensor Nodes
The PIC18F43K22-I/MV's nanoWatt XLP technology delivers sub-100 nA sleep current and ~150 uA/MIPS active draw, enabling multi-year coin-cell operation for remote sensors. Its 36 GPIO, 10-bit ADC, and 28 channels support simultaneous temperature, humidity, and battery-voltage monitoring. The integrated RTCC with secondary 32 kHz oscillator maintains accurate wall-clock timing during sleep, eliminating the need for an external RTC chip. UART peripherals handle Sub-GHz or BLE module interfaces, while the 8 MHz internal RC eliminates external oscillator cost. Active firmware typically runs below 4 KB, leaving 4 KB for protocol stacks and OTA bootloader.
Recommended
Capacitive Touch User Interfaces
The PIC18F43K22-I/MV integrates a CTMU (Charge Time Measurement Unit) and 10-bit ADC that together implement hardware-based capacitive touch sensing for buttons, sliders, and proximity sensors without external touch ICs. Microchip's mTouch reference firmware supports up to 28 touch channels with environmental compensation and noise immunity suitable for appliances and industrial controls. The 16 MIPS performance comfortably handles debounce, gesture, and LED feedback loops, while nanoWatt XLP keeps idle touch sensors drawing microamps. Industrial temperature range and high ESD tolerance suit consumer white goods and HMI panels.
Recommended
Small Appliance and White-Good Controls
The PIC18F43K22-I/MV drives coffee machines, washing machines, microwave ovens, and other white goods with its 16 MIPS performance, two CCP/ECCP for motor and PWM control, and 10-bit ADC for temperature and current sensing. The 36 GPIO easily handles keypad scan, seven-segment or LCD driving, relay drivers, triac firing, and buzzer feedback. The 2.5-5.5V supply range operates directly from rectified mains via a small transformer or capacitive dropper. Industrial temperature rating covers kitchen and laundry environments. Compact 40-UQFN (MV) 5x5 mm footprint fits dense control boards.
Recommended
Automotive Body and HVAC Modules
The PIC18F43K22-I/MV is specified for industrial temperature -40C to +85C and integrates the peripherals needed for body control and HVAC subsystems: EUSART for LIN-bus transceivers, CCP for fan and blower PWM, and ADC for NTC temperature sensing. The nanoWatt XLP sleep mode supports key-off quiescent current budgets below 100 uA per module, satisfying automotive dark-current requirements. For AEC-Q100 qualified body modules, Microchip offers the PIC18F46K22-I/MV automotive grade variants with PPAP documentation.
Recommended
USB-to-UART Bridge and Serial Adapters
The PIC18F43K22-I/MV's two EUSART peripherals support simultaneous USB-CDC enumeration via an external USB transceiver or direct UART bridging at up to 921.6 kbps. With 8 KB Flash, the standard CDC class driver and bootloader fit comfortably, leaving room for protocol converters (RS-232 to RS-485, Modbus RTU/ASCII gateways). The hardware MSSP supports SPI slave mode for SD-card logging, while the CTMU enables debug button or status LED touch panels. The compact UQFN-40 footprint suits thumb-drive-form-factor adapters and DIN-rail modules.
Recommended
LED Lighting Controllers and Drivers
The PIC18F43K22-I/MV's two CCP/ECCP peripherals generate high-resolution PWM at up to 20 kHz for flicker-free LED dimming, while the 10-bit ADC reads ambient light sensors and current-sense amplifiers for closed-loop constant-current regulation. The 36 GPIO supports multiple LED channels, push-button input, IR remote control via comparator, and DMX-512 or DALI interfaces through the EUSART. NanoWatt XLP keeps standby power below 100 uA, satisfying ENERGY STAR standby requirements for smart bulbs and architectural lighting controllers.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F43K22-I/MV — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F43K22T-I/MV | PIC18F45K22-I/MV | PIC18F46K22-I/MV | PIC18F44K22-I/MV | PIC18F43K20-I/MV |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-UQFN (MV) 5x5 mm | 40-UQFN (MV) 5x5 mm - same | 40-UQFN (MV) 5x5 mm - same | 40-UQFN (MV) 5x5 mm - same | 40-UQFN (MV) 5x5 mm - same | 40-UQFN (MV) 5x5 mm - same |
| Flash Program Memory | 8 KB (4K x 16) | 8 KB (4K x 16) - same | 16 KB (8K x 16) | 32 KB (16K x 16) | 16 KB (8K x 16) | 8 KB (4K x 16) |
| Data RAM | 512 bytes | 512 bytes - same | 768 bytes | 1536 bytes | 768 bytes | 512 bytes |
| Maximum Clock | 64 MHz (16 MIPS) | 64 MHz - same | 64 MHz - same | 64 MHz - same | 64 MHz - same | 64 MHz - same |
| ADC Resolution | 10-bit, 28 channels | 10-bit, 28 channels - same | 10-bit, 28 channels - same | 10-bit, 28 channels - same | 10-bit, 28 channels - same | 10-bit, 14 channels |
| CTMU / Touch Support | Yes (CTMU hardware) | Yes - same | Yes - same | Yes - same | Yes - same | No |
| Operating Voltage | 2.5V to 5.5V | 2.5V to 5.5V - same | 2.5V to 5.5V - same | 2.5V to 5.5V - same | 2.5V to 5.5V - same | 2.5V to 5.5V - same |
Key Differentiators
- Highest program-memory density at 8 KB Flash in this 40-UQFN footprint for cost-sensitive designs (vs PIC18F43K22T-I/MV (tape-and-reel variant only))
- Industrial temperature grade (-40C to +85C) with nanoWatt XLP sleep current (vs PIC18F26K80-I/SP)
- On-chip CTMU enables capacitive touch sensing without external touch ICs (vs PIC18F43K20-I/MV)
- Drop-in upgrade path with more Flash for product family variants (vs PIC18F44K22-I/MV (16 KB) and PIC18F46K22-I/MV (32 KB))
Design Notes
The 40-UQFN (MV) package exposes a thermal pad beneath the die that must be soldered to the PCB ground plane. Use at least 4 thermal vias (0.3 mm drill, 0.6 mm pad) connecting the EP to an inner ground plane for mechanical stability and heat dissipation. Failure to solder the EP can cause intermittent resets during peak load due to poor thermal contact. Recommended land pattern per IPC-7351 - QFN 5x5 mm, 0.4 mm pitch.
Place a 100 nF decoupling capacitor as close as possible to each VDD pin (pin 8 and pin 35), with a 10 uF bulk capacitor on the supply rail. The PIC18F43K22-I/MV's nanoWatt XLP sleep current is below 100 nA only when all peripherals are properly disabled and unused I/O pins are set as outputs low or inputs with no floating state. Floating inputs increase leakage by 1-5 uA per pin and can defeat low-power sleep budgets.
For ADC accuracy, add a 100 nF + 10 uF capacitor pair on the VDD line within 5 mm of the package. Use short, ground-referenced analog traces; never run digital signals parallel to analog traces without ground shielding. For capacitive touch (CTMU), keep touch sensor traces short (< 50 mm) and route them away from switching power and high-current traces. Reference Microchip AN1250 "mTouch Conducted Noise Immunity" for production-grade touch EMC performance.
Do not leave unused I/O pins floating - configure as outputs low or inputs with internal weak pull-ups to prevent shoot-through current and EMI. Configure MCLR (pin 25) with a 10 kOhm pull-up to VDD; do not leave MCLR floating. Disable unused peripherals in firmware before sleep. When using the ICSP interface, isolate PGC (RB6) and PGD (RB7) from external driver circuitry so in-circuit programming works without removing the chip from the board.
Compliance Information
RoHS compliant per Microchip product page. Industrial temperature grade only - not AEC-Q100 qualified. For automotive designs, choose the automotive-grade K22 family variants. Lead-free matte-tin finish per Microchip package spec.
