PIC18LF44J10-I/P - 8-Bit 40MHz PIC18 16KB Flash MCU | Microchip
MPN: PIC18LF44J10-I/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.35 | $335.00 |
| 500 | $2.95 | $1,475.00 |
| 1,000 | $2.6 | $2,600.00 |
PIC18LF44J10-I/P Overview
What is a PIC18 microcontroller? PIC18 is Microchip's high-performance 8-bit family built on a Harvard RISC architecture with modified 16-bit instruction words; it sits between the baseline PIC10/12/16 and the 16-bit dsPIC/PIC24 families, providing higher code density, C-compiler efficiency, and richer peripherals than legacy 8-bit parts while remaining lower-cost and lower-power than 16/32-bit alternatives. The 'LF' suffix denotes a wide-voltage, low-power variant compatible with battery and 3.3V designs.
Key features include 16KB (8K x 16) self-programmable Flash, 1KB SRAM, 13-channel 10-bit A/D converter, two analog comparators, enhanced USART with LIN support, two I2C/SPI capable MSSP ports, two 8-bit and three 16-bit timers, and nanoWatt Technology with multiple idle/sleep modes that drop current to microampere levels. The 40-MHz oscillator drives 12 MIPS throughput, enabling real-time control loops previously requiring 16-bit cores.
Typical applications include USB peripherals (HID class devices, CDC virtual COM ports), industrial sensor interfaces, low-power data loggers, LIN slave nodes in automotive body electronics, and battery-powered consumer appliances. The Industrial temperature range plus 2-5.5V supply flexibility also suits HVAC controllers, smart metering, and home automation gateways.
Design consideration: Use Microchip's MPLAB X IDE with XC8 compiler and MPLAB ICD 3 or PICkit 3/4 for programming/debugging. Place a 100nF decoupling capacitor on each VDD/AVDD pair as close to the IC as possible and keep analog traces away from switching nodes to preserve ADC accuracy.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that go beyond the manufacturer datasheet, helping engineers select and source the PIC18LF44J10-I/P efficiently.
Drop-in alternatives for PIC18LF44J10-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 PIC18LF44J10-I/P (same form factor and footprint) — differing in Package, ADC, Timers, I/O Pins, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F44J10-I/PT
✅ Drop-In✓ In Stock
$3.1 / Unit
View Datasheet →PIC18LF44J10-I/ML
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.2 / Unit
View Datasheet →PIC18LF24J10-I/P
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F45K50-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.74 / Unit
View Datasheet →PIC18LF458-I/P
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18LF44J10-I/P Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Family | PIC18LF (PIC18J series, low-voltage) |
| Program Memory | 16 KB (8K x 16) Flash |
| RAM | 1024 bytes |
| CPU Speed | 40 MHz / 12 MIPS |
| Supply Voltage (Vdd) | 2.0 V to 5.5 V |
| I/O Pins | 34 |
| ADC | 13 channels x 10-bit |
| Comparators | 2 analog comparators |
| Timers | 2 x 8-bit + 3 x 16-bit |
| Communication | EUSART (LIN), 2 x MSSP (I2C/SPI) |
| Package | 40-pin PDIP (DIP-40, 0.600" / 15.24 mm) |
| Mounting Type | Through-Hole |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Power-Saving Tech | nanoWatt Technology (multiple idle/sleep modes) |
| RoHS Status | Compliant (Lead-Free) |
PIC18LF44J10-I/P Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input, active low |
| Pin 2 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Pin 3 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Pin 4 | RA2/AN2/Vref- — Digital I/O / Analog input 2 / ADC Vref- |
| Pin 5 | RA3/AN3/Vref+ — Digital I/O / Analog input 3 / ADC Vref+ |
| Pin 6 | RA4/AN4 — Digital I/O / Analog input 4 |
| Pin 7 | RA5/AN5 — Digital I/O / Analog input 5 |
| Pin 8 | RA6 — Digital I/O |
| Pin 9 | RA7 — Digital I/O |
| Pin 10 | RE0 — Digital I/O |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKI — Crystal oscillator input or external clock |
| Pin 14 | OSC2/CLKO — Crystal oscillator output or clock output |
| Pin 15 | RC0 — Digital I/O |
| Pin 16 | RC1 — Digital I/O |
| Pin 17 | RC2 — Digital I/O |
| Pin 18 | RC3 — Digital I/O |
| Pin 19 | RD0 — Digital I/O |
| Pin 20 | RD1 — Digital I/O |
| Pin 21 | RD2 — Digital I/O |
| Pin 22 | RD3 — Digital I/O |
| Pin 23 | RC4 — Digital I/O |
| Pin 24 | RC5 — Digital I/O |
| Pin 25 | RC6 — Digital I/O / TX |
| Pin 26 | RC7 — Digital I/O / RX |
| Pin 27 | RD4 — Digital I/O |
| Pin 28 | RD5 — Digital I/O |
| Pin 29 | RD6 — Digital I/O |
| Pin 30 | RD7 — Digital I/O |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply voltage |
| Pin 33 | RB0/AN12 — Digital I/O / Analog input channel 12 |
| Pin 34 | RB1/AN10 — Digital I/O / Analog input channel 10 |
| Pin 35 | RB2/AN8 — Digital I/O / Analog input channel 8 |
| Pin 36 | RB3/AN9 — Digital I/O / Analog input channel 9 |
| Pin 37 | RB4/AN11 — Digital I/O / Analog input channel 11 |
| Pin 38 | RB5/AN7 — Digital I/O / Analog input channel 7 |
| Pin 39 | RB6/PGC — Digital I/O / ICSP clock |
| Pin 40 | RB7/PGD — Digital I/O / ICSP data |
Typical Applications
PIC18LF44J10-I/P is suitable for 6 applications: USB HID / CDC Peripherals, Industrial Sensor Interface Nodes, LIN Bus Slave Nodes, Battery-Powered Data Loggers, Home Automation Gateways, HVAC Control Boards.
USB HID / CDC Peripherals
The PIC18LF44J10-I/P fits USB HID-class peripherals such as keyboards, mice, custom HID joysticks, and CDC virtual COM ports when paired with an external USB transceiver. Its 40MHz/12 MIPS core executes USB low-speed protocol stacks in firmware with margin, and the 16KB Flash holds both bootloader and HID descriptors. The 2.0-5.5V wide supply allows direct bus-powered operation from 5V USB rails without additional LDO. The Industrial temperature grade suits peripherals used in factory automation and outdoor kiosks, while the 34 I/O pins support matrix-scanned key switches, LED indicators, and rotary encoders in the same compact 40-pin PDIP footprint.
Recommended
Industrial Sensor Interface Nodes
For 4-20mA loop sensors, RTD conditioning boards, and Modbus RTU slave modules, the PIC18LF44J10-I/P offers 13 channels of 10-bit ADC, two analog comparators for threshold detection, and two MSSP ports for SPI sensor ICs and I2C EEPROM logging. Its 2.0-5.5V supply integrates with 3.3V sensor rails or 5V industrial backplanes, and the -40C to +85C industrial grade supports cabinet-free installation near motors and process equipment. The nanoWatt sleep modes drop current below 1uA between Modbus polling cycles, making it suitable for solar-powered remote telemetry units with LiSOCl2 primary cells lasting 10+ years.
Recommended
LIN Bus Slave Nodes
The PIC18LF44J10-I/P integrates an enhanced USART with LIN bus master/slave support, making it ideal for LIN 1.x/2.x slave nodes in body electronics such as window lift switches, mirror controls, seat position sensors, and HVAC panel buttons. Its 40MHz core handles LIN break/sync detection and UART baud-rate adaptation in real time, and the 16KB Flash stores node configuration and diagnostic identifiers. Wide 2.0-5.5V supply tolerates 12V automotive cranking transients after external regulator drops. Industrial temperature grade covers under-hood and cabin environments for both passenger and commercial vehicle body controllers.
Recommended
Battery-Powered Data Loggers
Battery-powered data loggers for cold-chain monitoring, HVAC performance tracking, and remote environmental sensing benefit from the PIC18LF44J10-I/P's nanoWatt Technology with multiple sleep modes that drop current to sub-microampere levels. The 2.0V minimum supply lets the design run from two AA alkaline cells down to end-of-life voltage, and the 1KB SRAM buffers 512 16-bit samples between Flash writes. Real-time clock via Timer1 plus the 32kHz secondary oscillator enables time-stamped logging at 1 sample/sec over multi-year deployments. Industrial temperature grade supports outdoor and refrigerated container installations.
Recommended
Home Automation Gateways
For home automation gateways bridging sensors to Wi-Fi/BLE radio modules, the PIC18LF44J10-I/P serves as a low-cost protocol converter handling Modbus RTU, DMX-512, or simple dry-contact inputs. Its two MSSP ports drive SPI sensors and I2C expanders simultaneously, while the EUSART links to RS-485 transceivers for industrial bus extension. The 34 I/O pins support multiple pushbuttons, status LEDs, and relay drivers in a single MCU, reducing BOM cost compared to discrete logic implementations. The Industrial temperature grade fits basement, attic, and outdoor electrical box installations.
Recommended
HVAC Control Boards
HVAC control boards for residential and light-commercial split systems, fan coil units, and thermostats use the PIC18LF44J10-I/P to drive triac-controlled compressor relays, read NTC thermistor temperatures via ADC, and communicate with indoor/outdoor units over UART. Its 2.0-5.5V supply operates from rectified 24VAC transformer rails without additional regulators, and the 34 I/O pins drive multi-stage compressors, reversing valves, and outdoor fan controls. nanoWatt Technology keeps standby power below 0.5W to meet Energy Star idle requirements, and Industrial temperature grade handles attic and outdoor unit enclosures down to -40C.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF44J10-I/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F44J10-I/P | PIC18LF44J10-I/ML | PIC18LF24J10-I/P | PIC18F45K50-I/P | PIC18LF458-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-pin PDIP | 40-pin PDIP - same | 44-pin QFN | 28-pin SPDIP | 40-pin PDIP - same | 40-pin PDIP - same |
| Program Memory | 16 KB Flash | 16 KB Flash | 16 KB Flash | 16 KB Flash | 32 KB Flash | 32 KB Flash |
| RAM | 1024 bytes | 1024 bytes | 1024 bytes | 1024 bytes | 1536 bytes | 2048 bytes |
| CPU Speed | 40 MHz / 12 MIPS | 40 MHz / 12 MIPS | 40 MHz / 12 MIPS | 40 MHz / 12 MIPS | 48 MHz / 12 MIPS | 40 MHz / 10 MIPS |
| Supply Voltage | 2.0 V to 5.5 V | 3.0 V to 3.6 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 1.8 V to 5.5 V | 4.2 V to 5.5 V |
| I/O Pins | 34 | 34 | 34 | 21 | 34 | 34 |
| On-Chip USB | No | No | No | No | Yes (USB 2.0 FS) | No (CAN instead) |
Key Differentiators
- Wide 2.0V-5.5V supply with nanoWatt Technology (vs PIC18F44J10-I/P)
- Industrial temperature grade and nanoWatt standby current (vs PIC18F4550-I/P)
- On-chip 13-channel 10-bit ADC with internal voltage reference (vs PIC16F877A-I/P)
Design Notes
Place a 100nF ceramic decoupling capacitor on each VDD pin (11 and 32) and a 10uF bulk capacitor at the board supply input. The PIC18LF44J10-I/P has two VDD pins that must both be connected for proper internal biasing. Add a ferrite bead or LC pi-filter on AVDD if analog accuracy is required; share the same ground reference for AGND and DGND tied at a single point near the IC.
Keep analog input traces (AN0-AN12) short and away from switching nodes such as relay coils, triac outputs, or oscillator traces. Use a ground guard ring around sensitive analog inputs if the board has noisy digital traces nearby. Place the decoupling capacitors within 3mm of the VDD/AVDD pins per Microchip's design guidelines for PIC18J family microcontrollers.
Do not exceed the maximum VDD of 5.5V; the LF variant is wide-voltage but still has an absolute maximum. The MCLR pin requires a 10k pull-up to VDD for normal operation; leaving MCLR floating causes intermittent resets. Configure unused I/O pins as outputs and tied low to minimize current leakage in nanoWatt sleep modes. When migrating from PIC18F44J10 to PIC18LF44J10, verify your firmware config bits support the wider 2-5.5V brown-out range.
The 40MHz internal oscillator is accurate to within +/-2% over the industrial temperature range, which is sufficient for UART up to 115200 baud. For CAN or LIN bus timing, use an external crystal on OSC1/OSC2 with 20-30pF load capacitors. The MSSP I2C pins (RC3/RC4 typically) need 4.7k-10k pull-ups to VDD; do not rely on the weak internal pull-ups for reliable multi-master I2C communication.
Compliance Information
RoHS-compliant per Microchip product page. Industrial (-40C to +85C) temperature grade. Not AEC-Q100 qualified - choose PIC18FxxKxx Q1 variants for automotive.
