PIC16LF18444-I/SO - 8-bit XLP MCU, 7KB Flash, 32MHz, SOIC-20 | Microchip
MPN: PIC16LF18444-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.62 | $1.62 |
| 10 | $1.45 | $14.50 |
| 100 | $1.18 | $118.00 |
| 500 | $1.02 | $510.00 |
| 1,000 | $0.88 | $880.00 |
| 3,000 | $0.79 | $2,370.00 |
PIC16LF18444-I/SO Overview
An 8-bit PIC microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile Flash program memory, data RAM, EEPROM, and a rich set of analog and digital peripherals around a RISC architecture optimized for deterministic real-time control. PIC16LF184xx parts sit in the PIC16 family hierarchy (8-bit MCU -> PIC16 family -> enhanced mid-range core -> XLP low-power family), and they are designed for battery-powered and energy-harvesting applications thanks to eXtreme Low-Power (XLP) technology that delivers nanoWatt sleep currents and active current in the microamp range.
Key differentiating specifications include a 12-bit ADC with Computation (ADC2), a 5-bit DAC, two PWM modules with complementary waveform generation (CWG), a comparator, EUSART, SPI and I²C peripherals, and Core Independent Peripherals (CIPs) that offload tasks from the CPU. The integrated 32 MHz internal oscillator and Memory Access Partitioning (MAP) feature let designers balance code protection against firmware update flexibility, while the Device Information Area (DIA) provides on-chip calibration data for temperature sensors and internal references.
Architecturally, the LF18444 uses a 14-bit instruction word, a hardware stack, and an instruction set optimized for C-compiled code (XC8). The CIP ecosystem — CWG, NCO, CLC, PWM, and configurable logic — allows complex timing and signal-conditioning functions to run without CPU intervention, lowering power and freeing the core for application logic. This combination of analog density, CIPs, and XLP is what differentiates the LF18444 from older PIC16 baseline parts.
Typical applications include portable industrial sensors, low-power IoT edge nodes, battery-powered metering, LED lighting controllers, and general-purpose user-interface boards that need USB-free serial communication. For designs that require a touch-down UART module (DMX/EL wire), the related PIC16LF18446 is a more appropriate choice within the same family.
A key design consideration is the 1.8–3.6 V supply window of the 'LF' variant. For systems powered from a 5 V rail or from a single-cell Li-ion above 3.6 V, the designer must either add a pre-regulator or select the PIC16F18444 (5 V) variant. The exposed pad on the SOIC package is not present; thermal dissipation at 32 MHz is small, but exposed-pad DFN/QFN variants of the same die exist for higher-pin-count boards.
This page synthesizes Microchip datasheet parameters, distributor pricing as of 2026-09-24, and drop-in alternatives (same SOIC-20 footprint, same PIC16LF18444-family die) that are not listed side-by-side on the Microchip product brief, giving engineers a single source for selection, AE-pairing, and procurement decisions.
Drop-in alternatives for PIC16LF18444-I/SO — 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 PIC16LF18444-I/SO (same form factor and footprint) — differing in ADC, Package, DAC, PWM Channels, Communication Peripherals.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LF18444-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LF18444-E/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F18444-I/SO
✅ Drop-In✓ In Stock
$0.68 / Unit
View Datasheet →PIC16LF18446-I/SO
✅ Drop-In✓ In Stock
$1.02 / Unit
View Datasheet →PIC16LF18445-I/SO
✅ Drop-In✓ In Stock
$1.15 / Unit
View Datasheet →PIC16LF18444-I/SO Maximum Ratings & Electrical Characteristics
| Core | PIC16 enhanced mid-range 8-bit |
| Program Memory | 7 KB (4K x 14) Flash |
| Data SRAM | 512 bytes |
| Data EEPROM | 256 bytes |
| Maximum CPU Speed | 32 MHz |
| Supply Voltage (VDD) | 1.8 V to 3.6 V |
| Operating Temperature | -40 °C to +85 °C (industrial, 'I') |
| Package | 20-pin SOIC (300 mil) |
| ADC | 12-bit ADC with Computation (ADC2) |
| DAC | 5-bit DAC |
| Comparators | Yes (with selectable reference) |
| PWM Channels | 2 x PWM |
| Complementary Waveform Generator (CWG) | Yes |
| Communication Peripherals | EUSART, SPI, I²C |
| XLP (eXtreme Low Power) | Yes |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited at ≤30 °C / 85 % RH) |
| RoHS Status | Compliant |
PIC16LF18444-I/SO Pin Configuration
| Pin 1 | RA0/ICSPDAT — Bidirectional I/O; ICSP data |
| Pin 2 | RA1/ICSPCLK — Bidirectional I/O; ICSP clock |
| Pin 3 | RA2 — Bidirectional I/O |
| Pin 4 | RA3/MCLR — Bidirectional I/O; Master Clear (reset, active-low) |
| Pin 5 | RA4 — Bidirectional I/O |
| Pin 6 | RA5 — Bidirectional I/O |
| Pin 7 | RA6 — Bidirectional I/O |
| Pin 8 | RA7 — Bidirectional I/O |
| Pin 9 | VSS — Ground reference |
| Pin 10 | RB0 — Bidirectional I/O |
| Pin 11 | RB1 — Bidirectional I/O |
| Pin 12 | RB2 — Bidirectional I/O |
| Pin 13 | RB3 — Bidirectional I/O |
| Pin 14 | RB4 — Bidirectional I/O |
| Pin 15 | RB5 — Bidirectional I/O |
| Pin 16 | RB6 — Bidirectional I/O |
| Pin 17 | RB7 — Bidirectional I/O |
| Pin 18 | VSS — Ground reference (second pin) |
| Pin 19 | VDD — Positive supply (1.8-3.6 V) |
| Pin 20 | RA7/VCAP — Bidirectional I/O; regulator output capacitor (must be tied to VDD for the LF variant per the SOIC package or carry the internal regulator capacitor) |
Typical Applications
PIC16LF18444-I/SO is suitable for 6 applications: Battery-Powered IoT Sensor Nodes, Portable Industrial Measurement & Metering, LED Lighting & Signage Controllers, Low-Power Wearable Health Devices, HMI / User Interface Boards (Touch Buttons & LCD), General-Purpose Serial-Communication Bridges.
Battery-Powered IoT Sensor Nodes
The PIC16LF18444-I/SO suits coin-cell and 2xAA IoT sensor nodes because it combines 1.8–3.6 V operation with eXtreme Low-Power (XLP) technology, nanoWatt sleep currents below 50 nA typical, and a 32 MHz active mode that lets the CPU burst-sleep for years of battery life. The 12-bit ADC2 with computation averages sensor readings autonomously, freeing the CPU for radio control while CIPs handle timing. Compared to a switching regulator, the part adds no EMI to the analog front-end, so weak sensor signals can be acquired cleanly even when the radio is active. Place a 0.1 µF ceramic cap on each VDD pin and route the ICSP pins to a 6-pin header for field firmware updates.
Recommended
Portable Industrial Measurement & Metering
The PIC16LF18444-I/SO fits portable industrial meters (gas, flow, energy) because its 12-bit ADC2 with computation delivers better than 0.1 % linearity on slow sensor signals while the CWG and 2x PWM modules drive piezo buzzers, LED indicators, and low-side switching FETs. The integrated 5-bit DAC and comparator enable closed-loop control of a boost or buck converter without external op-amps, shrinking the BOM. At 32 MHz, the core executes the metering algorithm and the UART diagnostic dump in real time; the EEPROM stores calibration tables that can be updated in the field. Use the EUSART for Modbus RTU over RS-485 with an external transceiver.
Recommended
LED Lighting & Signage Controllers
The PIC16LF18444-I/SO drives LED lighting strings and signage because the CWG (Complementary Waveform Generator) produces non-overlapping complementary outputs with dead-band control suitable for synchronous buck or full-bridge LED drivers. The 2x PWM channels provide 16-bit resolution at low frequencies for color-mixing and dimming, while the DMA-less data pump via SPI ports APA-102 / SK6812 LED chains directly. The 1.8–3.6 V VDD matches single-cell Li-ion packs for portable lighting strips. Compared to a discrete 555-based driver, the part integrates brown-out, watchdog, and ADC-based temperature foldback, increasing reliability.
Recommended
Low-Power Wearable Health Devices
The PIC16LF18444-I/SO is well-suited to wearable health patches (heart-rate, SpO2, temperature) because its XLP nanoWatt technology delivers sleep currents low enough for a multi-day patch on a CR2032, while the 12-bit ADC2 with computation oversamples photodiode signals for accurate PPG heart-rate measurement. The CLC (Configurable Logic Cell) implements a custom peak-detect filter in hardware, offloading the CPU and reducing active time per sample. The SPI peripheral drives low-energy BLE modules over short bursts. Always place a ferrite bead on the supply rail to keep the MCU's digital switching noise out of the analog front-end.
Recommended
HMI / User Interface Boards (Touch Buttons & LCD)
The PIC16LF18444-I/SO drives small HMI boards that combine LED indicators, capacitive buttons, and character LCDs. The 5-bit DAC and PWM channels dim the LCD backlight and status LEDs while the comparator detects button-press events autonomously via CIPs, eliminating polling overhead. The EUSART, SPI, and I²C peripherals simultaneously support a host MCU, an external EEPROM, and an IO expander. Compared to a discrete logic-based HMI, the part reduces BOM by 10+ components while enabling firmware-based UI updates. Pull-ups on SDA/SCL are required for stable I²C at 400 kHz.
Recommended
General-Purpose Serial-Communication Bridges
The PIC16LF18444-I/SO is a compact bridge between UART, SPI, and I²C buses for industrial gateways and legacy equipment retrofits. Its EUSART (with LIN master support) plus independent SPI and I²C peripherals allow simultaneous, non-blocking protocol conversion under firmware control. The 32 MHz core executes the bridge at full bus speeds up to 1 Mbit/s on SPI without CPU saturation. The 256-byte EEPROM stores bridge configuration and protocol mapping tables across power cycles. Add a TVS diode on the UART lines for ESD protection in industrial environments.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LF18444-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LF18444-I/P | PIC16LF18444-E/SO | PIC16F18444-I/SO | PIC16LF18446-I/SO | PIC16LF18445-I/SO |
|---|---|---|---|---|---|---|
| Package | 20-pin SOIC (300 mil) | PDIP-20 (through-hole, same die, different footprint) | 20-pin SOIC (300 mil) — same | 20-pin SOIC (300 mil) — same | 20-pin SOIC (300 mil) — same | 20-pin SOIC (300 mil) — same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| VDD Range | 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 | 1.8 V to 3.6 V | 1.8 V to 3.6 V |
| Program Flash | 7 KB (4K x 14) | 7 KB | 7 KB | 7 KB | 7 KB | 14 KB |
| Data RAM | 512 B | 512 B | 512 B | 512 B | 512 B | 1 KB |
| Data EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| Operating Temperature | -40 °C to +85 °C (industrial, 'I') | -40 °C to +85 °C | -40 °C to +125 °C (extended, 'E') | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| ADC | 12-bit ADC2 | 12-bit ADC2 | 12-bit ADC2 | 12-bit ADC2 | 12-bit ADC2 | 12-bit ADC2 |
| Touch-Sensing (mTouch) | No | No | No | No | Yes (mTouch) | No |
| Approx. 1k Price (USD) | 0.88 | 0.92 | 1.05 | 0.92 | 0.95 | 1.02 |
Key Differentiators
- Same die as 5 V variant for drop-in voltage scaling (vs PIC16F18444-I/SO)
- Adds mTouch capacitive-sensing peripheral (vs PIC16LF18446-I/SO)
- Double the Flash for firmware-heavy designs (vs PIC16LF18445-I/SO)
Design Notes
The PIC16LF18444-I/SO is a 1.8–3.6 V part. Place a 0.1 µF ceramic decoupling capacitor as close as physically possible to each VDD pin (pin 1 and pin 19) and route each VDD pin to its own decoupling cap. For battery-powered designs add a 10 µF bulk cap at the battery terminal to suppress impedance spikes during transmit bursts, and consider a ferrite bead in series with VDD if analog noise from digital I/O switching is observed on ADC2 readings. Estimated: 0.1 µF + 10 µF decoupling is sufficient for designs under 30 mA peak loads.
Two common PIC16LF18444-I/SO pitfalls: (1) Forgetting that this 'LF' variant has no on-chip 5 V regulator — tying it directly to a 5 V rail destroys the part; use the PIC16F18444 instead. (2) Leaving the MCLR/RA3 pin floating — MCLR is active-low reset and must be tied to VDD through a 10 kΩ resistor (or directly to VDD if the internal MCLR is enabled in the configuration word via the ICS bit set to 0). A floating MCLR causes intermittent reset events when the I/O toggles.
For SOIC-20 (300 mil) layout, route the ICSP pins (RA0/ICSPDAT, RA1/ICSPCLK, MCLR/RA3) to a 6-pin 0.1" header or test pad so the part can be re-programmed in-circuit using MPLAB X IDE and a PICkit 4 or Snap programmer. Place the ICSP header on the same PCB edge as the UART/SPI/I²C connectors to minimize cable crossings during programming. Always include a ground keep-out around the ICSP header to keep digital-switching noise from coupling into the analog ADC2 channels.
Compliance Information
RoHS and lead-free per Microchip product page. The /SO SOIC-20 suffix denotes the 300-mil SOIC package, which is fully RoHS-compliant. AEC-Q100 not applicable for general-purpose industrial grade; for automotive select the PIC16F18444-E/SO automotive-grade variant.
