PIC18LF44K22T-I/PT - 16KB Flash XLP 8-bit MCU, 44-TQFP | Microchip
MPN: PIC18LF44K22T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.1 | $3.10 |
| 10 | $2.78 | $27.80 |
| 100 | $2.45 | $245.00 |
| 500 | $2.18 | $1,090.00 |
| 1,000 | $1.95 | $1,950.00 |
PIC18LF44K22T-I/PT Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data RAM, EEPROM, and programmable peripherals on one die. Within the broader taxonomy, PIC18 sits between the baseline PIC10/12/16 family and the 16-bit dsPIC/PIC24 family, targeting applications that need more code space, more peripherals, and C-friendly architecture than entry-level 8-bit parts, while still avoiding the cost and complexity of 32-bit ARM Cortex-M cores. The 'LF' prefix denotes the low-voltage Flash variant designed to operate down to 1.8V, distinguishing it from the 5V-tolerant 'F' parts.
Key features include 16 KB self-programmable Flash with 10,000 erase/write cycles endurance, 768 bytes SRAM, 256 bytes EEPROM with 1,000,000 erase/write cycles, 36 digital I/O pins, two Enhanced USART modules, two MSSP (SPI/I2C) modules, two 10-bit ADC modules with up to 28 channels, two 10-bit DAC modules, three 16-bit timers, four 8-bit timers, and an 8-bit Parallel Slave Port (PSP). The integrated nanoWatt XLP technology delivers sleep currents below 100 nA typical and active currents near 6 mA at full MIPS.
Architecturally, the device uses a Harvard-structure 8-bit data path with a 16-bit instruction word, an 8x8 hardware multiply, hardware single-cycle register operations, and priority levels for interrupts. The 64 MHz internal oscillator, software-selectable frequency ranges, and the on-chip 31 kHz low-power oscillator form the flexible clock tree that drives both CPU and peripherals.
Typical applications include battery-powered sensor nodes with months-of-life duty cycles, portable consumer devices such as remote controls and health monitors, low-power industrial control peripherals including HVAC nodes and metering, USB/HID human-interface devices when paired with a PIC18F4550-family controller, and automotive body controllers where AEC-Q100 isn't required. The wide peripheral set also suits intelligent sensors and small appliances.
When designing with this part, note that XLP sleep currents only hit their lowest spec with the internal low-frequency oscillator and certain peripherals disabled in PMD; the user must program PMD and OSCCON carefully. Watch the Vbor and Vbat behavior if using battery-backup mode, and always reserve the PGM/ICSP2.5 programming clock pin from analog routing.
This page synthesizes distributor stock, drop-in alternative MPNs from the same PIC18(L)F4XK22 family, parametric comparison tables, and practical design notes that go beyond a single datasheet cover page.
Drop-in alternatives for PIC18LF44K22T-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 PIC18LF44K22T-I/PT (same form factor and footprint) — differing in Operating Temperature, Program Memory (Flash), RoHS Status, ADC, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF44K22-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF44K22-E/PT
✅ Drop-In✓ In Stock
$1.7 / Unit
View Datasheet →PIC18LF45K22T-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF43K22T-I/PT
✅ Drop-In✓ In Stock
$1.68 / Unit
View Datasheet →PIC18F44K22T-I/PT
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →PIC18LF44K22T-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF44K22T-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 (8-bit Harvard) |
| Program Memory (Flash) | 16 KB (8K x 16 words) |
| Data SRAM | 768 bytes |
| Data EEPROM | 256 bytes |
| Maximum CPU Speed | 64 MHz / 16 MIPS |
| Supply Voltage (LF variant) | 1.8 V to 3.6 V |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Digital I/O Pins | 36 |
| ADC Modules / Channels | 2 x 10-bit, up to 28 channels |
| DAC Modules | 2 x 10-bit |
| Enhanced USART Modules | 2 |
| MSSP (SPI / I2C) Modules | 2 |
| Timers | 3 x 16-bit + 4 x 8-bit |
| Parallel Slave Port (PSP) | Yes (8-bit) |
| Low-Power Technology | nanoWatt XLP |
| Package | 44-pin TQFP (PT), 10x10x1 mm |
| Mounting Type | Surface Mount |
| RoHS Status | Lead-free / RoHS Compliant |
PIC18LF44K22T-I/PT Pin Configuration
| Pin 1 | RA2 — Digital I/O / analog input AN2 |
| Pin 2 | RA3 — Digital I/O / analog input AN3 / Vref+ |
| Pin 3 | RA4 — Digital I/O / analog input AN4 |
| Pin 4 | RA5 — Digital I/O / analog input AN5 |
| Pin 5 | VDD — Positive supply voltage |
| Pin 6 | VSS — Ground reference |
| Pin 7 | OSC1/CLKI/RA7 — Crystal input or external clock / digital I/O |
| Pin 8 | OSC2/CLKO/RA6 — Crystal output or clock out / digital I/O |
| Pin 9 | RC0 — Digital I/O / analog input AN16 |
| Pin 10 | RC1 — Digital I/O / analog input AN17 |
| Pin 11 | RC2 — Digital I/O / analog input AN18 |
| Pin 12 | RC3 — Digital I/O / analog input AN19 |
| Pin 13 | RC4 — Digital I/O / digital input D- / analog input AN20 |
| Pin 14 | RC5 — Digital I/O / digital output D+ |
| Pin 15 | RC6 — Digital I/O / TX1 |
| Pin 16 | RC7 — Digital I/O / RX1 |
| Pin 17 | RD0 — Digital I/O / PSP data bit 0 |
| Pin 18 | RD1 — Digital I/O / PSP data bit 1 |
| Pin 19 | RD2 — Digital I/O / PSP data bit 2 |
| Pin 20 | RD3 — Digital I/O / PSP data bit 3 |
| Pin 21 | RD4 — Digital I/O / PSP data bit 4 |
| Pin 22 | RD5 — Digital I/O / PSP data bit 5 |
| Pin 23 | RD6 — Digital I/O / PSP data bit 6 |
| Pin 24 | RD7 — Digital I/O / PSP data bit 7 |
| Pin 25 | VSS — Ground reference |
| Pin 26 | VDD — Positive supply voltage |
| Pin 27 | RB0 — Digital I/O / interrupt-on-change |
| Pin 28 | RB1 — Digital I/O / interrupt-on-change |
| Pin 29 | RB2 — Digital I/O / interrupt-on-change |
| Pin 30 | RB3 — Digital I/O / interrupt-on-change |
| Pin 31 | RB4 — Digital I/O / interrupt-on-change |
| Pin 32 | RB5 — Digital I/O / interrupt-on-change |
| Pin 33 | RB6 — ICSPCLK / digital I/O / interrupt-on-change |
| Pin 34 | RB7 — ICSPDAT / digital I/O / interrupt-on-change |
| Pin 35 | RE0 — Digital I/O / RD signal for PSP |
| Pin 36 | RE1 — Digital I/O / WR signal for PSP |
| Pin 37 | RE2 — Digital I/O / CS signal for PSP |
| Pin 38 | RE3 — Digital I/O / MCLR reset input (default) |
| Pin 39 | RA0 — Digital I/O / analog input AN0 |
| Pin 40 | RA1 — Digital I/O / analog input AN1 |
| Pin 41 | RA3 — Digital I/O / Vref+ (shared with pin 2 - alternate) |
| Pin 42 | AVDD — Analog positive supply |
| Pin 43 | AVSS — Analog ground |
| Pin 44 | RC5 — Digital I/O / D+ (alternate mapping) |
Typical Applications
PIC18LF44K22T-I/PT is suitable for 6 applications: Battery-Powered IoT Sensor Nodes, Portable Consumer Devices (Remote Controls, Toys, Wearables), Industrial Control Peripherals (HVAC, Metering, Sensor Hubs), Small Appliance and White Goods Control Boards, HID Devices and Consumer Peripherals, Intelligent Sensors and Smart Measurement Modules.
Battery-Powered IoT Sensor Nodes
The PIC18LF44K22T-I/PT suits battery-powered IoT sensor nodes because nanoWatt XLP sleep currents below 100 nA allow a single CR2032 to deliver months-to-years of duty-cycled operation. The 64 MHz/16 MIPS core comfortably handles sensor acquisition, local filtering, and LoRa/Sigfox/BLE-pre-processing before the radio wakes. The 1.8V-3.6V supply matches 1x or 2x AA and 1x CR2032/CR2477 cells directly. Engineers typically run the ADC at sample rates of a few kilosamples-per-second, place the device in Sleep between samples, and gate the radio via a GPIO. The wide ADC channel count (up to 28) means a single MCU can read temperature, humidity, battery voltage, and several analog sensor outputs without an external mux.
Recommended
Portable Consumer Devices (Remote Controls, Toys, Wearables)
Low-cost portable consumer products like TV remotes, e-reader buttons, handheld toys, fitness bands, and wearables benefit from the PIC18LF44K22T-I/PT's small BOM, low supply current, and flexible I/O. The 2x USART plus 2x MSSP provide enough buses for BLE module handshaking, IR transmit, accelerometer I2C, and a small OLED SPI display. The 36 I/O pins allow tactile-button matrices up to 6x6 without external mux. Industrial -40C to +85C range survives sweat, pockets, and outdoor use. With a 3V coin cell and average duty cycle under 1%, runtime of 1-3 years is realistic.
Recommended
Industrial Control Peripherals (HVAC, Metering, Sensor Hubs)
The PIC18LF44K22T-I/PT is a strong fit for industrial peripherals such as HVAC zone controllers, sub-metering modules, and sensor hubs that aggregate 4-20 mA or 0-10V analog inputs into a digital protocol on the uplink. The wide 28-channel ADC capacity combined with dual 10-bit DACs allows direct 4-20 mA loopback control without an external DAC. The 16 KB Flash accommodates a Modbus RTU or BACnet stack; the 256-byte EEPROM is ideal for non-volatile calibration records. The -40C to +85C industrial range covers most industrial cabinets and outdoor enclosures with conformal coating.
Recommended
Small Appliance and White Goods Control Boards
Coffee makers, blenders, induction cooktops, washing-machine submodules, and microwave key panels all benefit from a small, low-power MCU with rich peripherals. The PIC18LF44K22T-I/PT drives triac/relay drivers via PWM or simple GPIO, reads capacitive-touch buttons via the CTMU, and runs the UI on an LED or segment LCD. With 16 KB Flash, mid-size touch + RTOS-free state machines fit easily, and the 36 I/O pins cover segmented displays up to 7-segment x 8 digits. The 1.8V-3.6V range is well-matched to 3.3V LDO-derived rails typical of small-appliance SMPS.
Recommended
HID Devices and Consumer Peripherals
The PIC18LF44K22T-I/PT supports human-interface devices such as custom keyboards, gaming peripherals, RGB-LED controllers, and configurable input panels when paired with a USB-capable host like the PIC18F4550 family or an external USB-UART bridge. Its 2x MSSP can drive both an SPI-based RGB LED matrix and an I2C-based OLED display simultaneously. The 16 KB Flash comfortably fits USB HID report descriptors, macro layers, and on-the-fly remapping tables. The low-voltage LF variant is well-suited to bus-powered devices drawing from the 5V USB rail through a 3.3V LDO.
Recommended
Intelligent Sensors and Smart Measurement Modules
Combining the 28-channel ADC, dual 10-bit DACs, and 16 KB Flash, the PIC18LF44K22T-I/PT serves as the brain of an intelligent sensor module - a self-contained unit that acquires analog data, applies digital filtering, linearizes, and outputs a clean digital signal. Applications include smart load cells, environmental sensor pods with auto-zero, and predictive-maintenance vibration nodes. The 768-byte SRAM supports moving-average or simple IIR filter pipelines. The 1.8V minimum supply is critical for energy-harvesting sensor pods that cannot tolerate 2.5V+ rails.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF44K22T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF44K22-I/PT | PIC18LF44K22-E/PT | PIC18LF45K22T-I/PT | PIC18LF43K22T-I/PT | PIC18F44K22T-I/PT | PIC18LF44K22T-I/ML |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin TQFP (PT) | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin QFN (ML) - cross-package note |
| Flash (KB) | 16 KB | 16 KB | 16 KB | 32 KB (+100%) | 8 KB (-50%) | 16 KB | 16 KB |
| SRAM (bytes) | 768 B | 768 B | 768 B | 1536 B (+100%) | 512 B (-33%) | 768 B | 768 B |
| EEPROM (bytes) | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| Supply Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 2.3 V to 5.5 V (NOT drop-in for low-voltage) | 1.8 V to 3.6 V |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | -40 C to +125 C (Extended) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Max CPU Speed | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS |
| Price (1k qty, USD) | 1.95 | 1.85 (tray, typically cheaper) | 2.30 (extended temp premium) | 2.10 | 1.80 | 1.95 | 2.05 |
Key Differentiators
- Extended temperature variant available with identical die and pinout (vs PIC18LF44K22-I/PT)
- Drop-in upgrade path to 32 KB Flash in same package (vs PIC18LF45K22T-I/PT)
- LF supply range allows direct coin-cell / 1x AA operation (vs PIC18F44K22T-I/PT)
Design Notes
Estimated: at 3.3V VDD and 16 MIPS active, the typical core current is roughly 6-8 mA, giving ~25 mW. In Sleep with all peripherals disabled via PMD, total current is sub-100 nA. When designing battery life, add the ADC bias current (~5 uA active), RTCC (~0.7 uA), and any pull-up resistor currents to the Sleep budget. The Vbor voltage threshold is configurable in software; pair Vbor setting with the battery cut-off to avoid deep discharge that could brick the LF Flash cells. The datasheet XLP chapter tabulates these currents explicitly.
Place the VDDCORE/VDD/VSS decoupling pair within 2 mm of the pins with 100 nF X7R plus a 10 uF bulk capacitor. The AVDD/AVSS pair needs its own 100 nF + 10 uF cap network to isolate analog reference noise; if the on-chip DAC is used, place its output cap as close as possible. Route the ICSPDAT/ICSPCLK pair to a header without crossover traces so the production programmer does not have to fight noise. Keep the 31 kHz LF crystal traces short and guarded with a ground ring to prevent switching noise from injecting into the timer tick.
Do NOT apply 5V to the LF (PIC18LF4XK22) parts - the Flash and I/O are only rated to 3.6V absolute maximum. Verify the MPN prefix before laying out the BOM; confusing 'LF' and 'F' is the most common source of first-spin board failures. Watch the RE3/MCLR pin - it must not be left floating or it can phantom-reset the device when the BOR or LVD is enabled. When using CTMU for capacitive touch, calibrate the ADC against Vref+ at production trim to avoid drift across temperature. Finally, when using the PSP bus on 28-44 pin variants, ensure the high-byte ports are configured as inputs before driving the bus.
Compliance Information
Lead-free and RoHS compliant per Microchip product page. Industrial -40C to +85C only - not AEC-Q100 qualified for automotive. Use the PIC18F family with explicit automotive suffix for AEC-Q100 applications. Halogen-free status not stated in distributor data.
