PIC18F43K22T-I/PT - 8-bit 64MHz 8KB Flash MCU | Microchip
MPN: PIC18F43K22T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.65 | $26.50 |
| 100 | $2.3 | $230.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.85 | $1,850.00 |
PIC18F43K22T-I/PT Overview
An 8-bit microcontroller (MCU) is a single-chip processor that integrates a CPU, program memory, data memory, and peripherals into one package. The PIC18F family combines a RISC-based Harvard architecture with rich peripheral integration, sitting between basic PIC16 MCUs and higher-end 16-bit dsPIC/PIC24 devices. The 'XLP' (eXtreme Low Power) designation indicates nanoWatt technology, with sleep currents as low as the tens-of-nA range, making the family well suited for battery-powered designs.
Key features of the PIC18F43K22 include: up to 36 I/O pins, 14-channel 10-bit ADC with computation, two analog comparators, two Enhanced USART modules, two MSSP (SPI/I2C) modules, four 16-bit timers plus three CCP and three ECCP capture/compare/PWM modules, and an internal 16 MHz oscillator with PLL support up to 64 MHz. The 64 MHz instruction-cycle performance delivers 16 MIPS throughput, providing ample headroom for sensor-fusion and control loops.
The architecture combines a modified Harvard bus with a 16-bit instruction word and an 8-bit data path, an 8-level hardware stack, and an interrupt controller supporting priority levels with hardware context saving. Internal oscillator accuracy is trimmed to within +/-2% across voltage and temperature, allowing designs to omit an external crystal in many cases. The integrated 10-bit ADC provides automatic acquisition and channel-scanning modes, easing firmware overhead.
Typical applications include industrial control panels, HVAC sensor nodes, low-power remote sensor nodes, USB/serial interface bridges, LED driver controllers, and small home appliances. Automotive body electronics and aftermarket gauge clusters are also supported via the part's recommended-for-automotive status (special order codes apply).
When designing with this device, note the 5V-tolerant digital inputs, the need for proper decoupling (100 nF + 1 uF bulk) near VDD/AVDD, and the fact that the analog reference voltage must be sourced from a low-noise regulator if ADC accuracy below 1 LSB drift is required. Migrating between 28/40/44-pin K22 variants requires only a recompile because the family shares a common peripheral set.
Drop-in alternatives for PIC18F43K22T-I/PT — 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 PIC18F43K22T-I/PT (same form factor and footprint) — differing in Package, Timers, ADC, Operating Temperature, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F43K22-I/PT
✅ Drop-In✓ In Stock
$1.95 / Unit
View Datasheet →PIC18F43K22T-I/ML
✅ Drop-In✓ In Stock
$1.78 / Unit
View Datasheet →PIC18F43K22-I/MV
✅ Drop-In✓ In Stock
$1.08 / Unit
View Datasheet →PIC18F43K22-E/PT
✅ Drop-In✓ In Stock
$2.18 / Unit
View Datasheet →PIC18F43K20T-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4331-I/PT
✅ Drop-In✓ In Stock
$3.05 / Unit
View Datasheet →PIC18F45Q10
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F43K22T-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 8-bit RISC (Harvard) |
| Family | PIC18 XLP 18K (PIC18F2X/4XK22) |
| Maximum CPU Frequency | 64 MHz (16 MIPS) |
| Program Memory (Flash) | 8 KB (4K x 16) |
| Data RAM | 768 bytes |
| Data EEPROM | 256 bytes (per datasheet family, see note) |
| Operating Voltage Range | 2.3 V to 5.5 V (Datasheet reference 4.2 to 5.5 V for LF/HF variants) |
| I/O Pins | 36 |
| ADC | 10-bit, up to 28 channels |
| Analog Comparators | 2 |
| UART Modules | 2 (Enhanced USART) |
| SPI Modules | 2 (via MSSP) |
| I2C Modules | 2 (via MSSP) |
| Timers | Four 16-bit + three 8-bit |
| CCP/ECCP | 3 CCP + 3 ECCP |
| Internal Oscillator | Yes (16 MHz with PLL, software selectable) |
| Operating Temperature | -40C to +85C (Industrial, 'I') |
| Package | 44-pin TQFP (PT), 10x10 mm |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Recommended for Automotive | Yes (special ordering codes required) |
PIC18F43K22T-I/PT Pin Configuration
| Pin 1 | RB7 — I/O port RB7 / KBI3 / PGC (ICSP clock) |
| Pin 2 | RB6 — I/O port RB6 / KBI2 / PGD (ICSP data) |
| Pin 3 | RB5 — I/O port RB5 / KBI1 |
| Pin 4 | RB4 — I/O port RB4 / KBI0 |
| Pin 5 | RB3 — I/O port RB3 / CCP2 |
| Pin 6 | RB2 — I/O port RB2 / CCP1 |
| Pin 7 | RB1 — I/O port RB1 / RX2/DT2 |
| Pin 8 | RB0 — I/O port RB0 / INT0 / FLT0 |
| Pin 9 | VSS — Ground |
| Pin 10 | VDD — Positive supply (2.3 V to 5.5 V) |
| Pin 11 | RC7 — I/O port RC7 / RX1/DT1 |
| Pin 12 | RC6 — I/O port RC6 / TX1/CK1 |
| Pin 13 | RC5 — I/O port RC5 / SDO2 |
| Pin 14 | RC4 — I/O port RC4 / SDI2/SDA2 |
| Pin 15 | RC3 — I/O port RC3 / SCK2/SCL2 |
| Pin 16 | RC2 — I/O port RC2 / ECCP1 |
| Pin 17 | RC1 — I/O port RC1 / ECCP2 / T3CKI |
| Pin 18 | RC0 — I/O port RC0 |
| Pin 19 | RD7 — I/O port RD7 / CCP4 |
| Pin 20 | RD6 — I/O port RD6 / TX2/CK2 |
| Pin 21 | RD5 — I/O port RD5 |
| Pin 22 | RD4 — I/O port RD4 |
| Pin 23 | RD3 — I/O port RD3 |
| Pin 24 | RD2 — I/O port RD2 |
| Pin 25 | RD1 — I/O port RD1 / IC2 |
| Pin 26 | RD0 — I/O port RD0 / IC1 |
| Pin 27 | RE3 — I/O port RE3 |
| Pin 28 | RE2 — I/O port RE2 |
| Pin 29 | RE1 — I/O port RE1 |
| Pin 30 | RE0 — I/O port RE0 |
| Pin 31 | MCLR — Master Clear (reset, active low) |
| Pin 32 | RA7 — I/O port RA7 / CLKI |
| Pin 33 | RA6 — I/O port RA6 / CLKO / OSC2 |
| Pin 34 | RA5 — I/O port RA5 / AN4 / SS1 |
| Pin 35 | RA4 — I/O port RA4 / T0CKI |
| Pin 36 | RA3 — I/O port RA3 / AN3 / VREF+ |
| Pin 37 | RA2 — I/O port RA2 / AN2 / VREF- |
| Pin 38 | RA1 — I/O port RA1 / AN1 / C1INC |
| Pin 39 | RA0 — I/O port RA0 / AN0 / C1INA |
| Pin 40 | VSS — Ground (second) |
| Pin 41 | AVDD — Analog positive supply |
| Pin 42 | AVSS — Analog ground |
| Pin 43 | RA5 — (see pin 34 - alternate assignment documented in datasheet) |
| Pin 44 | OSC1 — External oscillator input / RA7 alt |
Typical Applications
PIC18F43K22T-I/PT is suitable for 7 applications: Industrial Control Panel, Low-Power Remote Sensor Node, HVAC Sensor and Controller, Automotive Body Electronics, USB / Serial Bridge Device, LED Lighting and Signage Controller, Small Home Appliance Controller.
Industrial Control Panel
The PIC18F43K22T-I/PT is well suited to industrial control panels where 36 I/O pins drive relays, switches, LEDs, keypads, and indicator lamps while maintaining deterministic response to operator input. The 64 MHz (16 MIPS) core handles debounced key scanning, multi-channel ADC monitoring of analog sensor inputs, and Modbus RTU polling over one of the two Enhanced USART ports, with ample headroom for custom state machines. The wide 2.3 V to 5.5 V supply allows direct connection to 24 V-derived 5 V or 3.3 V rails, while nanoWatt XLP sleep modes drop the standby current to tens of nA between operator actions, extending the lifetime of battery-backed indicator panels. The 44-pin TQFP footprint is easy to assemble on standard 2-layer FR4 PCBs and supports both point-to-point wiring harnesses and ribbon-cable interconnect to daughter boards.
Recommended
Low-Power Remote Sensor Node
Battery-powered wireless sensor nodes leverage the PIC18F43K22T-I/PT nanoWatt XLP technology to achieve multi-year battery life on a pair of AA cells or a single Li-ION cell. Sleep currents drop into the tens-of-nA range with the RTCC running, allowing the MCU to wake every few seconds to read a thermistor, photodiode, or gas-sensor via the 10-bit ADC. The 64 MHz core wakes from sleep in microseconds, computes an FFT or running average, and transmits over an SPI-controlled LoRa or sub-GHz radio before returning to sleep. The 2.3 V minimum input lets the design ride cell voltage all the way down to near-end-of-life, and the 768-byte RAM comfortably holds a 32-sample window plus radio frame buffer.
Recommended
HVAC Sensor and Controller
The PIC18F43K22T-I/PT fits HVAC control boards that need simultaneous temperature, humidity, and pressure sensing along with relay or triac output control for fans, compressors, and dampers. The 14-channel 10-bit ADC reads thermistor and ratiometric pressure transducers, while the three ECCP modules generate zero-cross-switched triac drive waveforms for proportional fan speed control. The second Enhanced USART supports Modbus RTU communication with a building-management system, while the I2C bus reads a digital humidity sensor and an EEPROM setpoint memory. NanoWatt XLP technology minimizes standby draw when the HVAC system is idle, helping meet energy-star and ErP standby targets without sacrificing wakeup latency.
Recommended
Automotive Body Electronics
The PIC18F43K22T-I/PT is recommended for automotive body electronics applications such as interior lighting controllers, mirror-position modules, seat-controller nodes, and HVAC blowers, where the wide operating temperature range and robust peripheral mix drive board consolidation. The two Enhanced USARTs connect to LIN bus transceivers for body-domain networking, while the ECCP modules drive PWM-controlled LED strings with hardware fault handling. The integrated 10-bit ADC with computation offloads windowed monitoring of battery voltage, current sense, and thermistor feedback. Automotive-grade screening with the appropriate ordering codes is recommended, although the standard industrial variant supports aftermarket designs.
Recommended
USB / Serial Bridge Device
The PIC18F43K22T-I/PT serves as a USB-to-UART or USB-to-SPI/I2C bridge, leveraging the 64 MHz instruction cycle to handle full-speed USB packetization alongside high-throughput peripheral translation. With a low-cost external 12 MHz crystal and PLL, the MCU presents a CDC-ACM virtual COM port on the host while transparently forwarding data to a downstream MCU or sensor network over UART or SPI. The 8 KB Flash comfortably stores USB descriptors and HID/COM class stacks, while the 768-byte RAM accommodates USB endpoint buffers plus framing logic. Industrial users benefit from the 2.3 V to 5.5 V input range, which lets the bridge power from the USB VBUS rail or a downstream logic rail.
Recommended
LED Lighting and Signage Controller
The PIC18F43K22T-I/PT drives DMX512 and SPI-controlled LED chains, where the 64 MHz core sustains up to 800 kbps DMX refresh rates while concurrently servicing on-board diagnostics and display updates. The three ECCP modules generate independent PWM outputs for RGB channels, while the MSSP ports daisy-chain APA102 or WS2812-style LED strips at high refresh rates with DMA-friendly SPI bursts. NanoWatt XLP sleep lets the controller shut down LED strings when the venue is closed, dropping to sub-uA standby. The 44-pin TQFP package gives ample pin budget for keypad, status LED, and I2C ambient-light sensor integration without external logic.
Recommended
Small Home Appliance Controller
The PIC18F43K22T-I/PT drives small kitchen and household appliances such as coffee machines, induction cooktops, and washing-machine sub-modules, where deterministic control and rich peripheral integration replace discrete logic. The 10-bit ADC reads NTC thermistors and current sense resistors, while the ECCP modules generate zero-cross-switched and phase-angle-controlled triac drive for heating elements and pumps. The second USART connects to a touch-panel controller or a Wi-Fi/BLE module for app-driven control. The 2.3 V to 5.5 V supply range supports both 3.3 V logic and 5 V analog sensor interfaces from a single MCU, reducing BOM and PCB area.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F43K22T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F43K22-I/PT | PIC18F43K22T-I/ML | PIC18F43K22-E/PT | PIC18F43K20T-I/PT | PIC18F45Q10 |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin TQFP (PT) | 44-pin TQFP (PT) | 44-pin QFN (ML) | 44-pin TQFP (PT) | 44-pin TQFP (PT) | 44-pin TQFP |
| CPU Speed | 64 MHz (16 MIPS) | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| Flash | 8 KB | 8 KB | 8 KB | 8 KB | 16 KB (+100%) | 32 KB |
| RAM | 768 bytes | 768 bytes | 768 bytes | 768 bytes | 1024 bytes (+33%) | 2 KB |
| Operating Temperature | -40C to +85C (I grade) | -40C to +85C | -40C to +85C | -40C to +125C (E grade) | -40C to +85C | -40C to +125C |
| ADC Channels | Up to 28 channels, 10-bit | Up to 28 ch, 10-bit | Up to 28 ch, 10-bit | Up to 28 ch, 10-bit | Up to 28 ch, 10-bit | Up to 24 ch, 12-bit |
| nanoWatt XLP | Yes | Yes | Yes | Yes | Yes | Yes |
| Lifecycle Status | Active (newer PIC18F45Q10 recommended) | Active | Active | Active | Active | Active (preferred) |
| Unit Price (1 pc, indicative) | $2.95 | $2.95 (Tray, comparable) | $2.95 (same die) | $3.10 (E grade premium) | $3.20 (16 KB Flash) | $3.50 (newer CIPs) |
Key Differentiators
- Same-family TQFP variants on Tray for low-volume prototyping (vs PIC18F43K22-I/PT)
- Higher-density QFN package for space-constrained designs (vs PIC18F43K22T-I/ML)
- Extended temperature for harsh environments (vs PIC18F43K22-E/PT)
- Double Flash memory for firmware headroom (vs PIC18F43K20T-I/PT)
- Modern CIP migration path with 12-bit ADC (vs PIC18F45Q10)
Design Notes
Place a 100 nF ceramic decoupling capacitor as close as possible to each VDD/AVDD pin pair, with a shared 1 µF to 10 µF bulk capacitor on the supply rail. The PIC18F43K22T-I/PT supports separate AVDD/AVSS for ADC noise isolation - route AVSS to a quiet ground island if ADC accuracy below 1 LSB is required. Use a ferrite bead between VDD and AVDD when the digital rails are noisy, and reference AVDD through a low-noise LDO such as MCP1700.
The 44-pin TQFP (PT) footprint uses 0.8 mm pitch with a 10x10 mm body. Route signals on inner layers to escape the high pin density, and use a ground pour under the package for thermal dissipation. ICSP pins (RB6/RB7) must be accessible without crossing other signal traces to allow in-circuit programming and debugging. The exposed thermal pad (if any) should be soldered to a copper pour tied to VSS.
Do not omit the MCLR pull-up resistor (typically 10 kΩ to VDD) - leaving MCLR floating causes erratic resets under noise. The configuration words (CONFIG1H-4L) must be programmed with valid oscillator and watchdog settings, or the part may not start. When migrating between PIC18F4XK22 variants, validate the analog channel mapping - although most peripherals are pin-compatible, the ADC channel assignments shift with package pin count.
Estimated: at 64 MHz / 5 V operation, the PIC18F43K22T-I/PT core current is typically 6 mA, dissipating approximately 30 mW. With a TQFP theta_JA around 50 C/W, junction temperature rise is roughly 1.5 C above ambient. Thermal design is rarely a concern for normal MCU operation; however, sustained high-current GPIO sourcing (e.g., 25 mA per pin with 36 I/O loaded) can add tens of mW and should be derated for elevated ambient.
Compliance Information
RoHS and REACH compliant per Microchip product page. Recommended for automotive designs with appropriate ordering codes; AEC-Q100 qualification is achieved via specific automotive part variants.