PIC18LF44K22-I/P - 16KB Flash 8-bit MCU 40-DIP | Microchip
MPN: PIC18LF44K22-I/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.34 | $4.34 |
| 10 | $3.91 | $39.10 |
| 100 | $3.47 | $347.00 |
| 500 | $3.12 | $1,560.00 |
| 1,000 | $2.78 | $2,780.00 |
PIC18LF44K22-I/P Overview
Key features include the nanoWatt XLP extreme-low-power technology with multiple idle and sleep modes, twelve ADC channels with 10-bit resolution, two Enhanced USART modules, two MSSP (SPI/I2C) modules, and seven PWM outputs. The 'LF' prefix indicates operation down to 1.8V, making it suitable for battery-powered and energy-harvesting systems where direct Li-ion or two-AA cell stacks are common.
The PIC18LF44K22 family is built on Microchip's enhanced PIC18 RISC architecture with a modified Harvard bus, 31-level hardware stack, and 8x8 hardware multiplier. This generation integrates a configurable 16-level deep FIFO on the USART peripherals and provides a peripheral pin-select (PPS) feature on most I/O, simplifying PCB routing on dense designs while preserving direct register compatibility with earlier PIC18F devices.
Typical applications include industrial sensor nodes, home-automation controllers, low-power remote keyless entry, HVAC control panels, motor-control loops with software PID, USB-to-UART bridges, and small graphic or character LCD human-machine interfaces. The DIP-40 package is favored by hobbyists, prototyping labs, and legacy-replacement programs because it supports breadboarding, socket installation, and easy rework.
When designing with this part, reserve one I/O pin for in-circuit serial programming (ICSP) using the standard PGD/PGC pair. The internal 16 MHz RC oscillator can be combined with the PLL to reach 64 MHz, but active mode current scales with frequency and load, so benchmark nanoWatt XLP sleep currents (typically a few hundred nA) before committing to battery-life estimates. Wide 1.8V-3.6V operation eliminates the need for an external LDO in 2-cell battery applications.
This page synthesizes Microchip datasheet parameters, drop-in alternatives within the PIC18 K22 family, and practical engineering notes that go beyond the standard distributor listing. Engineers searching for a 40-pin DIP 8-bit MCU with deep PIC18 toolchain support will find the consolidated package, pinout, application, and alternative views here.
Drop-in alternatives for PIC18LF44K22-I/P — 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 PIC18LF44K22-I/P (same form factor and footprint) — differing in Package, ADC, Operating Temperature, Core, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F44K22-I/P
✅ Drop-In✓ In Stock
$1.36 / Unit
View Datasheet →PIC18LF45K22-I/P
✅ Drop-In✓ In Stock
$3.35 / Unit
View Datasheet →PIC18LF43K22-I/P
✅ Drop-In✓ In Stock
$2.25 / Unit
View Datasheet →PIC18LF44K22-E/PT
✅ Drop-In✓ In Stock
$1.7 / Unit
View Datasheet →PIC18LF44K22-I/P Maximum Ratings & Electrical Characteristics
| Family | PIC18 K22 |
| Core | 8-bit PIC RISC (Harvard) |
| Maximum CPU Frequency | 64 MHz |
| Instruction Cycle Time | 200 ns (16 MIPS) |
| Program Memory (Flash) | 16 KB |
| Data RAM | 768 bytes |
| Data EEPROM | 256 bytes |
| I/O Pins | 36 |
| ADC | 10-bit, up to 28 channels |
| Operating Voltage Range | 1.8 V to 3.6 V |
| Operating Temperature Range | -40C to +85C (Industrial) |
| Package | 40-pin PDIP (DIP-40) |
| Mounting Type | Through-Hole |
| Number of PWM Channels | 7 |
| Number of Timers (8/16-bit) | 4 / 3 |
| Communication | 2x EUSART, 2x MSSP (SPI/I2C) |
| Low-Power Technology | nanoWatt XLP |
| RoHS Status | Compliant |
PIC18LF44K22-I/P Pin Configuration
| Pin 1 | MCLR/VPP/RE3 — Master Clear (reset) input / Programming voltage / Digital I/O RE3 |
| Pin 2 | RA0 — Digital I/O RA0 / AN0 |
| Pin 3 | RA1 — Digital I/O RA1 / AN1 |
| Pin 4 | RA2 — Digital I/O RA2 / AN2 / VREF- |
| Pin 5 | RA3 — Digital I/O RA3 / AN3 / VREF+ |
| Pin 6 | RA4 — Digital I/O RA4 / T0CKI / AN4 |
| Pin 7 | RA5 — Digital I/O RA5 / AN5 / SS1 |
| Pin 8 | RE0 — Digital I/O RE0 / AN6 |
| Pin 9 | RE1 — Digital I/O RE1 / AN7 |
| Pin 10 | RE2 — Digital I/O RE2 / AN8 |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKI/RA7 — Crystal oscillator input / External clock / Digital I/O RA7 |
| Pin 14 | OSC2/CLKO/RA6 — Crystal oscillator output / Clock output / Digital I/O RA6 |
| Pin 15 | RC0 — Digital I/O RC0 / AN12 |
| Pin 16 | RC1 — Digital I/O RC1 / AN13 / CCP2 |
| Pin 17 | RC2 — Digital I/O RC2 / AN14 / CCP1 |
| Pin 18 | RC3 — Digital I/O RC3 / AN15 / SCL1 |
| Pin 19 | RD0 — Digital I/O RD0 / PSP0 |
| Pin 20 | RD1 — Digital I/O RD1 / PSP1 |
| Pin 21 | RD2 — Digital I/O RD2 / PSP2 |
| Pin 22 | RD3 — Digital I/O RD3 / PSP3 |
| Pin 23 | RC4 — Digital I/O RC4 / SDA1 |
| Pin 24 | RC5 — Digital I/O RC5 / SDO1 |
| Pin 25 | RC6 — Digital I/O RC6 / TX1/CK1 |
| Pin 26 | RC7 — Digital I/O RC7 / RX1/DT1 |
| Pin 27 | RD4 — Digital I/O RD4 / PSP4 / SDO2 |
| Pin 28 | RD5 — Digital I/O RD5 / PSP5 / SDI2 |
| Pin 29 | RD6 — Digital I/O RD6 / PSP6 / SCK2 |
| Pin 30 | RD7 — Digital I/O RD7 / PSP7 / SS2 |
| Pin 31 | VDD — Positive supply voltage |
| Pin 32 | VSS — Ground reference |
| Pin 33 | RB0 — Digital I/O RB0 / INT0 / AN10 |
| Pin 34 | RB1 — Digital I/O RB1 / INT1 / AN8 |
| Pin 35 | RB2 — Digital I/O RB2 / INT2 / AN9 |
| Pin 36 | RB3 — Digital I/O RB3 / INT3 / AN11 / CCP2 |
| Pin 37 | RB4 — Digital I/O RB4 / KBI0 / AN11 |
| Pin 38 | RB5 — Digital I/O RB5 / KBI1 / AN13 / CCP3 |
| Pin 39 | RB6 — Digital I/O RB6 / KBI2 / PGC |
| Pin 40 | RB7 — Digital I/O RB7 / KBI3 / PGD |
Typical Applications
PIC18LF44K22-I/P is suitable for 6 applications: Battery-Powered Sensor Node, Industrial Control Panel, Home Automation Hub, HVAC Fan / Damper Controller, USB-to-UART Bridge Module, Character LCD User Interface.
Battery-Powered Sensor Node
The PIC18LF44K22-I/P fits battery-powered sensor nodes because its 1.8-3.6V supply operates directly from two AA cells or a single Li-ion cell, while the nanoWatt XLP technology delivers sleep currents below 200 nA per Microchip's datasheet. Its 28-channel 10-bit ADC handles multi-sensor analog front ends, and two MSSP ports can interface SPI temperature/pressure sensors plus I2C accelerometers. Placed as the master MCU in a remote end-node design, it wakes on a timer interrupt, samples sensors, transmits on EUSART, and returns to sleep, yielding multi-year coin-cell life. Compared to 32-bit MCUs in the same role, it cuts active mode power by roughly 60% and BOM cost by half while preserving deterministic interrupt latency for time-critical sensor polling.
Recommended
Industrial Control Panel
The PIC18LF44K22-I/P serves industrial control panels requiring keypad input, LED/LCD feedback, and relay outputs through its 36 I/O pins and 7 PWM channels. The 64 MHz core runs Modbus RTU on the EUSART at 115.2 kbaud while simultaneously debouncing 4x4 key matrices via timer-driven interrupts. Its industrial -40C to +85C rating handles factory floor environments, and 16 KB Flash holds the full Modbus state machine plus diagnostics. A typical design connects the MCU to a 4x20 character LCD via 4-bit parallel mode, four SSR-driven relay outputs, and an RS-485 transceiver on the EUSART. The wide-voltage 1.8-3.6V operation eliminates a separate 24V-to-5V LDO stage in 24V-bus systems by using a discrete pre-regulator upstream.
Recommended
Home Automation Hub
The PIC18LF44K22-I/P drives home-automation hubs that aggregate multiple wireless sub-GHz or BLE sensors through its dual EUSART and MSSP channels. Operating at 64 MHz, it parses incoming sensor frames, runs rule-engine logic, and dispatches commands to actuators without offloading to a host processor. The 768-byte RAM accommodates small packet buffers and state-machine contexts for simultaneous connections. Designers pair it with a CC1101 sub-GHz transceiver and an HM-10 BLE module to bridge legacy and modern sensor networks. Unlike Linux-based hubs, this MCU-based hub boots in milliseconds and survives brown-out events gracefully due to the PIC18's robust brown-out reset and watchdog timer block.
Recommended
HVAC Fan / Damper Controller
The PIC18LF44K22-I/P controls HVAC fan speeds and damper positions through its 7 PWM channels and integrated 10-bit ADC. Four PWM outputs drive variable-speed blower fans while three more position motorized dampers via H-bridge drivers; the ADC reads supply current, temperature, and humidity feedback loops. Software PID runs at 1 kHz on the 16 MIPS core, well within the instruction budget when interrupts are managed correctly. Its wide 1.8-3.6V operation simplifies 24V HVAC bus integration with a single pre-regulator. Compared to mechanical thermostats, this design enables programmable scheduling, remote setpoint control, and continuous diagnostic logging for fault detection in commercial HVAC systems.
Recommended
USB-to-UART Bridge Module
The PIC18LF44K22-I/P implements a USB-to-UART bridge when paired with an external USB transceiver, leveraging its 16 KB Flash for the USB stack and CDC class driver. The EUSART module handles UART signaling up to 921.6 kbaud, while the MSSP port manages USB VBUS sensing and suspend/resume signaling. Operating at 3.3 V, it matches common logic levels for direct connection to TTL UART peripherals. Designers typically add an MCP2200-compatible firmware image and expose TX/RX/DTR/RTS lines on a 6-pin header. This approach replaces dedicated bridge ICs with a generic 8-bit MCU, adding firmware flexibility (custom baud rates, GPIO breakouts) at modest BOM cost.
Character LCD User Interface
The PIC18LF44K22-I/P drives HD44780-compatible character LCDs (16x2, 20x4) through its parallel I/O ports, supporting both 4-bit and 8-bit modes. With 36 I/O pins, it can simultaneously operate the LCD, a 4x4 keypad, status LEDs, and a serial debug port without external multiplexing. Custom character glyphs are stored in Flash and copied to the LCD CGRAM at startup via simple bit-banged sequences. The wide 1.8-3.6V operation suits portable LCD instruments running from Li-ion cells, while the nanoWatt XLP sleep mode reduces current to a few hundred nanoamps when the display is blanked. Compared to dedicated LCD controller ICs, this approach consolidates display, keypad, and serial logic into one MCU.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF44K22-I/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F44K22-I/P | PIC18LF45K22-I/P | PIC18LF43K22-I/P | PIC18LF44K22-E/P |
|---|---|---|---|---|---|
| Package | PDIP-40 | PDIP-40 - same | PDIP-40 - same | PDIP-40 - same | PDIP-40 - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Program Memory (Flash) | 16 KB | 16 KB | 32 KB | 8 KB | 16 KB |
| Data RAM | 768 bytes | 768 bytes | 1536 bytes | 512 bytes | 768 bytes |
| Data EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Operating Voltage Range | 1.8 V to 3.6 V | 2.7 V to 5.5 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +125C (Extended) |
| Maximum CPU Frequency | 64 MHz (16 MIPS) | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| I/O Pins | 36 | 36 | 36 | 36 | 36 |
Key Differentiators
- Wide 1.8-3.6V supply enables direct battery operation (vs PIC18F44K22-I/P)
- DIP-40 package for breadboard prototyping and legacy replacement (vs PIC18LF44K22-I/PT (TQFP-44 SMD))
- Higher memory variant available in same package (vs PIC18LF43K22-I/P)
Design Notes
Estimated: at 64 MHz active mode and 3.3 V supply, the PIC18LF44K22-I/P draws approximately 7-10 mA active and under 200 nA in nanoWatt XLP sleep per Microchip datasheet DC characteristics. For battery-life estimates, multiply sleep duty cycle (e.g. 99.5% for a 30-second sample interval) by sleep current and add active-mode energy per measurement. Decouple VDD/VSS pairs with 100 nF ceramics placed within 5 mm of each pin pair to suppress switching noise from internal peripherals.
Reserve dedicated traces to PGC (RB6) and PGD (RB7) for in-circuit serial programming; route them away from high-current switching nodes to avoid programming failures. Place the ICSP connector near the MCU and add ESD protection diodes on PGD/PGC if the connector is user-accessible. Keep the MCLR line pulled up with a 10 kohm resistor and decouple with a 100 nF capacitor to VSS; never leave MCLR floating on a PIC18 or reset behavior becomes unpredictable.
Do not assume peripherals are at fixed pins on the PIC18LF44K22-I/P - most digital functions are remappable via Peripheral Pin Select (PPS), but ADC inputs and a few legacy functions remain pin-locked. When migrating code from PIC18F45K22 to PIC18LF44K22, verify ADC channel count (28 channels vs lower pin-count variants) and double-check the ICSP clock bit configuration, which differs between K22 sub-families. Brown-out reset voltage must be set above the minimum VDD of 1.8 V or the part will reset unexpectedly during battery voltage droop.
Compliance Information
RoHS and REACH compliant per Microchip product declaration. Industrial -40C to +85C temperature grade, not AEC-Q100 qualified for automotive - use PIC18LF44K22-E/P for extended temperature. Lead-free and halogen-free per Microchip green-compliance statements.
