PIC18LF24K40-I/ML - 8-bit 64MHz 16KB Flash XLP MCU | Microchip
MPN: PIC18LF24K40-I/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.66 | $26.60 |
| 100 | $2.28 | $228.00 |
| 500 | $1.97 | $985.00 |
| 1,000 | $1.65 | $1,650.00 |
PIC18LF24K40-I/ML Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and configurable peripherals on one die. The PIC18LF24K40 belongs to the 8-bit PIC18 microcontroller hierarchy (PIC -> PIC18 -> PIC18F/LF K40), which sits under the broader category of embedded microcontrollers and semiconductor ICs. The 'LF' prefix denotes the low-voltage, low-power XLP variant; 'F' variants in this family operate from 2.3V to 5.5V instead.
Key features include 1KB of SRAM, 256 bytes of EEPROM, a 24-channel 10-bit ADC with internal voltage reference, two PWM modules, two comparators, two I2C/SPI/UART peripherals, nine timers, and Core Independent Peripherals (CIPs) such as the Complementary Waveform Generator (CWG), WWDT, CRC/Memory Scan, Hardware CVD, Zero-Cross Detect, and Peripheral Pin Select (PPS). The device typically consumes only ~50 nA in sleep mode at 1.8V, making it well-suited to battery-powered designs.
Technically, the PIC18LF24K40 uses an enhanced Harvard architecture with a 16-bit instruction word and 8-bit data path, achieving up to 16 MIPS at 64MHz. The XLP technology combined with nanoWatt XLP peripherals allows selective peripheral clock gating, while PPS lets the user remap digital peripherals to any I/O pin, simplifying PCB routing and BOM consolidation.
Typical applications include IoT sensor nodes, battery-powered remote controls, low-energy wireless sensor platforms, consumer appliances, HVAC controllers, and small industrial control boards. Its wide peripheral integration allows a single chip to replace a discrete analog front-end plus a logic controller in many designs.
When designing with this part, add a 100 nF decoupling capacitor close to each VDD pin and place a bulk capacitor (1-10 uF) near the device. Note that PPS must be configured before enabling peripheral output, otherwise the peripheral signal will not appear on any pin. Source: Microchip PIC18(L)F24K40 datasheet family document.
This page consolidates distributor pricing, drop-in alternatives, and design notes that go beyond the manufacturer's datasheet and distributor listings, giving procurement and design engineers a single reference point for the PIC18LF24K40-I/ML.
Drop-in alternatives for PIC18LF24K40-I/ML — 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 PIC18LF24K40-I/ML (same form factor and footprint) — differing in ADC, Package, I/O Pins, Core Architecture, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F24K40-I/ML
✅ Drop-In✓ In Stock
$1.66 / Unit
View Datasheet →PIC18LF24K40-E/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF24K40T-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24K42-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24K20-I/ML
✅ Drop-In✓ In Stock
$2.4 / Unit
View Datasheet →PIC18LF24K40-I/ML Maximum Ratings & Electrical Characteristics
| Core | PIC18, 8-bit RISC, enhanced Harvard |
| Max CPU Frequency | 64 MHz |
| Program Memory (FLASH) | 16 KB (8K x 16) |
| Data SRAM | 1 KB |
| Data EEPROM | 256 B |
| Operating Voltage Range | 1.8 V to 3.6 V |
| Min VDD @ 32 MHz | 2.5 V |
| Min VDD @ 16 MHz | 1.8 V |
| ADC | 24-channel, 10-bit, with internal FVR |
| PWM Modules | 2 (10-bit) |
| Comparators | 2 |
| Timers | 9 (8/16-bit mix) |
| I/O Pins | 25 (high-current capable) |
| Communication | 2x EUSART, 2x MSSP (I2C/SPI) |
| Package | 28-pin QFN (6x6 mm) with exposed pad |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +85 C (Industrial) |
| RoHS Status | Compliant |
| MSL Level | 1 |
PIC18LF24K40-I/ML Pin Configuration
| Pin 1 | RA2 — Port A bit 2 / analog input |
| Pin 2 | RA3 — Port A bit 3 / analog input |
| Pin 3 | RA4 — Port A bit 4 / analog input |
| Pin 4 | RA5 — Port A bit 5 / analog input |
| Pin 5 | RA6 — Port A bit 6 / analog input |
| Pin 6 | RA7 — Port A bit 7 / analog input |
| Pin 7 | VSS — Ground |
| Pin 8 | VDD — Positive supply |
| Pin 9 | RA0 — Port A bit 0 / analog input |
| Pin 10 | RA1 — Port A bit 1 / analog input |
| Pin 11 | RB0 — Port B bit 0 / analog input |
| Pin 12 | RB1 — Port B bit 1 / analog input |
| Pin 13 | RB2 — Port B bit 2 / analog input |
| Pin 14 | RB3 — Port B bit 3 / analog input |
| Pin 15 | RC0 — Port C bit 0 |
| Pin 16 | RC1 — Port C bit 1 |
| Pin 17 | RC2 — Port C bit 2 |
| Pin 18 | RC3 — Port C bit 3 |
| Pin 19 | RC4 — Port C bit 4 |
| Pin 20 | RC5 — Port C bit 5 |
| Pin 21 | RC6 — Port C bit 6 |
| Pin 22 | RC7 — Port C bit 7 |
| Pin 23 | RB4 — Port B bit 4 |
| Pin 24 | RB5 — Port B bit 5 |
| Pin 25 | RB6 — Port B bit 6 / ICSCLK |
| Pin 26 | RB7 — Port B bit 7 / ICSDAT |
| Pin 27 | MCLR — Master clear / reset input |
| Pin 28 | AVSS — Analog ground |
Typical Applications
PIC18LF24K40-I/ML is suitable for 6 applications: Battery-Powered IoT Sensor Node, Low-Power Remote Control / HMI, HVAC / Climate Control Module, Consumer Appliance Controller, Industrial Sensor Interface Board, Educational / Hobby Embedded Platform.
Battery-Powered IoT Sensor Node
The PIC18LF24K40-I/ML is an excellent fit for battery-powered IoT sensor nodes thanks to its 1.8V-3.6V operating range and nanoWatt XLP technology delivering approximately 50 nA sleep current per the manufacturer datasheet. Its 24-channel 10-bit ADC handles multiple analog sensors (temperature, humidity, light) without external muxes, while 16KB FLASH comfortably runs Microchip's lightweight sensor-fusion firmware stacks. The 28-pin 6x6mm QFN (ML) package allows compact node enclosures. For a representative design the MCU sleeps most of the time, wakes on a timer interrupt to sample, transmits via the EUSART to a 2.4GHz radio module, then returns to sleep. Trade-off: this is an 8-bit core, so compute-intensive edge-AI workloads should look at Cortex-M0+ alternatives.
Recommended
Low-Power Remote Control / HMI
Handheld remote controls and small HMI panels benefit from the PIC18LF24K40-I/ML because the LF silicon supports direct 3V coin-cell operation without an LDO. Its 24-channel ADC reads multiple capacitive-touch or resistive buttons via Hardware CVD (Capacitive Voltage Divider), a Core Independent Peripheral that performs capacitive sensing in hardware without CPU intervention. The PWM modules directly drive backlight, buzzer, or LED indicators, and the two comparators implement brown-out and zero-cross detect. With 1KB SRAM and 16KB FLASH, the device can implement IR/RF protocols and button debounce state machines comfortably. The 6x6mm QFN fits into space-constrained wand-style enclosures. Estimated: at typical 3V coin-cell use, average current is dominated by transmit bursts, not the MCU core.
Recommended
HVAC / Climate Control Module
The PIC18LF24K40-I/ML is well-suited for HVAC control modules where multiple temperature sensors, fan-speed outputs, and relay drives must be coordinated. Its 24 ADC channels read thermistors at multiple inlet/outlet locations, while its two PWM modules generate the variable-speed fan or damper control signals. The two on-chip comparators can directly implement overcurrent detection on a 24VAC-rectified input, eliminating a discrete comparator. Core Independent Peripherals like the CWG (Complementary Waveform Generator) provide hardware-dead-band control for power-FET half-bridges without CPU load. The 28-QFN footprint and -40C to +85C industrial temperature range fit typical appliance environments. Note: for line-voltage HVAC applications, add galvanic isolation between mains and the MCU.
Recommended
Consumer Appliance Controller
Compact consumer appliances such as coffee makers, blenders, and rice cookers use the PIC18LF24K40-I/ML to consolidate control logic into a single low-voltage MCU. The 16KB FLASH stores user-interface state machines and sensor-processing firmware, while the 1KB SRAM handles run-time scratch and display buffers. The 24-channel ADC monitors temperature, water level, weight, and motor current; the 2 PWM channels drive heating elements via TRIAC phases or DC motor drivers; the EUSART ports link to BLE or Wi-Fi modules for app-controlled variants. Compared to discrete logic implementations, a single PIC18LF24K40 reduces BOM cost and PCB area, and the 6x6mm QFN package enables small enclosure designs.
Recommended
Industrial Sensor Interface Board
Industrial sensor interface boards use the PIC18LF24K40-I/ML to convert 4-20 mA or 0-10V analog field signals into digital data for PLCs or industrial networks. The 24-channel 10-bit ADC with internal Fixed Voltage Reference eliminates the need for external precision references on simple boards. The two EUSART peripherals enable simultaneous Modbus RTU over RS-485 plus a local debug/console port, while the MSSP peripherals handle SPI displays or I2C sensor stacks. The 1KB SRAM supports FIFO buffers for protocol framing, and 16KB FLASH accommodates a full Modbus stack plus calibration tables. Hardware CRC (CIP) ensures data integrity on noisy industrial buses. The -40C to +85C industrial temperature range suits cabinet environments.
Recommended
Educational / Hobby Embedded Platform
The PIC18LF24K40-I/ML is a popular choice for educational platforms because of its low cost (~$0.62 single-piece at LCSC as of 2026-09-28), generous 16KB FLASH for student projects, and Microchip's free MPLAB X IDE plus XC8 compiler toolchain. The 24-channel ADC, 9 timers, and 25 I/O pins give students exposure to multiple peripheral types within a single low-cost device. PPS lets instructors reassign peripherals per lab exercise without re-routing PCBs. The 6x6mm QFN is hand-solderable with practice; for early coursework DIP-packaged variants (PIC18F24K40-I/P, 28-DIP) are recommended and then ported to QFN for the final project.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF24K40-I/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F24K40-I/ML | PIC18LF24K40-E/ML | PIC18LF24K40T-I/ML | PIC18F24K42-I/ML | PIC18F24K20-I/ML |
|---|---|---|---|---|---|---|
| Package | 28-QFN (6x6 mm) | 28-QFN (6x6 mm) - same | 28-QFN (6x6 mm) - same | 28-QFN (6x6 mm) - same | 28-QFN (6x6 mm) - same | 28-QFN (6x6 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Operating Voltage | 1.8V to 3.6V (LF) | 2.3V to 5.5V (F) | 1.8V to 3.6V (LF) | 1.8V to 3.6V (LF) | 2.3V to 5.5V (F) | 2.3V to 5.5V (F) |
| FLASH | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB | 8 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 512 B |
| ADC Channels | 24 | 24 | 24 | 24 | 24 | 14 |
| Max Frequency | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| Temperature Range | -40C to +85C (Industrial) | -40C to +85C | -40C to +125C (Extended) | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Lowest voltage operation in family (vs PIC18F24K40-I/ML)
- Extended temperature variant available in same package (vs PIC18F24K40-I/ML)
- More ADC channels than legacy K20 family (vs PIC18F24K20-I/ML)
Design Notes
Always place a 100 nF decoupling capacitor within 2 mm of each VDD/AVDD pin and a bulk 1-10 uF tantalum or ceramic at the supply. The PIC18LF24K40 datasheet recommends separating analog (AVDD/AVSS) and digital (VDD/VSS) rails when the ADC is used. For low-noise ADC readings, drive the analog VDD from a separate ferrite-bead-filtered LDO output even if the same 3.3V rail is used. Estimated: 100 nF + 10 uF combination yields about 20-50 mVpp supply ripple at the MCU.
The 28-QFN (ML) package has an exposed thermal pad that must be soldered to the PCB ground plane with an array of thermal vias for heat dissipation. Per the manufacturer datasheet, this pad is electrically the primary ground return for the device and omitting it can cause self-heating, reset issues, or analog drift. Recommend a 3x3 to 5x5 via array at 0.3-0.5 mm pitch tying the pad to a continuous ground plane.
PPS (Peripheral Pin Select) must be configured in firmware BEFORE enabling a peripheral output, otherwise the peripheral signal will not appear on any I/O. The PIC18LF24K40 requires unlocking PPS via the PPSLOCK register sequence. Also note that on the LF variant, minimum VDD at 32MHz is 2.5V (not 1.8V) - running at 32MHz+ on a 1.8V supply will cause oscillator fail or erratic behavior. Verify FCPU and FOSC settings against the Fosc vs VDD graph in the datasheet.
The PIC18LF24K40 has 25 high-current-sink/source capable I/O pins, but driving LEDs directly still requires a current-limiting resistor. For PWM-driven LED brightness, drive MOSFET gates rather than LEDs to avoid ground bounce. The EUSART and MSSP pins should be routed as short, matched-length traces away from high-current switching signals. For 25 I/O pins in a 6x6mm QFN, expect fan-out routing challenges; consider 4-layer PCB stackup with dedicated power/ground planes.
Compliance Information
RoHS and REACH compliant per Microchip product page. The PIC18LF24K40-I/ML is industrial-grade, NOT AEC-Q100 qualified; use PIC18LF24K40-E/ML (extended temp) or contact Microchip for AEC-Q100 variants. Lead-free reflow compatible.
