PIC18LF24K40-I/SP - 8-bit 64MHz XLP MCU 16KB Flash | Microchip
MPN: PIC18LF24K40-I/SP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.4 | $2.40 |
| 10 | $2.16 | $21.60 |
| 100 | $1.93 | $193.00 |
| 500 | $1.74 | $870.00 |
| 1,000 | $1.55 | $1,550.00 |
PIC18LF24K40-I/SP Overview
An 8-bit microcontroller is a single-chip computer built around an 8-bit data path, optimized for deterministic real-time control and low cost. It sits in the broader taxonomy of microcontrollers -> embedded microcontrollers -> semiconductor ICs -> digital logic. Compared with 16-bit and 32-bit MCUs, 8-bit PIC devices excel at bit-level I/O, interrupt latency, and BOM-cost-sensitive applications where raw compute throughput is not the bottleneck.
Key features include 25-channel 10-bit ADC with computation (ADC2), Complementary Waveform Generator (CWG), Windowed Watchdog Timer (WWDT), CRC/Memory Scan, Zero-Cross Detect (ZCD), Hardware CVD for capacitive touch, Peripheral Pin Select (PPS), and Microchip's eXtreme Low Power (XLP) technology with sub-uA sleep modes for energy harvesting and IoT endpoints. Seven PWM channels, two I2C/SPI, two UART, and up to 25 I/O pins support sensor and motor-control front-ends.
Internally, the device uses Microchip's enhanced PIC18 RISC core with a hardware multiplier, 32-level stack, and a 31 kHz to 64 MHz internal oscillator block. The CWG and PPS reduce external glue logic, shrinking PCB area and BOM cost in motor drive and power-conversion designs.
Typical applications include low-power IoT sensor nodes, capacitive touch user interfaces, LED lighting controllers, small BLDC fan/pump drivers, battery-powered medical wearables, and home-automation end nodes. Industrial use cases cover sensor signal conditioning, fault detection, and supervisory controllers in 24V factory automation.
A key design consideration is choosing the correct voltage/frequency pair: 1.8V/16MHz, 2.5V/32MHz, or 3.3V/64MHz. Each clock rate below 64MHz trades CPU performance for lower core current, so plan peripheral throughput before scaling VDD down.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone Microchip datasheet, giving procurement and firmware teams a faster engineering decision path.
Drop-in alternatives for PIC18LF24K40-I/SP — 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/SP (same form factor and footprint) — differing in ADC, Package, MSL Level, Operating Temperature, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF25K40-I/SP
✅ Drop-In✓ In Stock
$1.74 / Unit
View Datasheet →PIC18LF24K40-E/SP
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24K40-I/SP
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF24K40-I/SO
✅ Drop-In✓ In Stock
$0.99 / Unit
View Datasheet →PIC18F25K40-I/SP
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC18LF25K22-I/SP
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF24K40-I/SP Maximum Ratings & Electrical Characteristics
| Family | PIC18 XLP 18K |
| Core | PIC18 (8-bit RISC) |
| Program Memory Size | 16 KB (8K x 16) Flash |
| RAM Size | 1 KB |
| EEPROM Size | 256 B |
| Maximum CPU Frequency | 64 MHz |
| Supply Voltage (LF) | 3.0 V to 3.6 V (1.8 V at 16 MHz, 2.5 V at 32 MHz) |
| I/O Pins | Up to 25 |
| ADC | 10-bit, up to 24 channels (ADC2 with computation) |
| PWM Channels | 7 (16-bit) |
| Timers | 1x 8-bit, 3x 16-bit |
| Communication | 2x UART, 2x I2C/SPI, 1x SPI dedicated |
| XLP Sleep Current | < 1 uA (typical, per Microchip XLP datasheet) |
| Operating Temperature | -40C to +85C (Industrial: I) |
| Package | 28-pin SPDIP (300 mil) |
| Mounting Type | Through-Hole |
| MSL Level | 1 (unlimited) |
| RoHS Status | Compliant |
PIC18LF24K40-I/SP Pin Configuration
| Pin 1 | MCLR/VPP/RA3 — Master clear / programming voltage / PORTA bit 3 |
| Pin 2 | RA0 — PORTA bit 0 (analog / digital I/O) |
| Pin 3 | RA1 — PORTA bit 1 (analog / digital I/O) |
| Pin 4 | RA2 — PORTA bit 2 (analog / digital I/O) |
| Pin 5 | RA4 — PORTA bit 4 (analog / digital I/O) |
| Pin 6 | RA5 — PORTA bit 5 (analog / digital I/O) |
| Pin 7 | RA6 — PORTA bit 6 (analog / digital I/O) |
| Pin 8 | RA7 — PORTA bit 7 (analog / digital I/O) |
| Pin 9 | VSS — Ground reference |
| Pin 10 | VDD — Positive supply (3.0-3.6V LF) |
| Pin 11 | RB0 — PORTB bit 0 (PPS-capable) |
| Pin 12 | RB1 — PORTB bit 1 (PPS-capable) |
| Pin 13 | RB2 — PORTB bit 2 (PPS-capable) |
| Pin 14 | RB3 — PORTB bit 3 (PPS-capable) |
| Pin 15 | RB4 — PORTB bit 4 (PPS-capable) |
| Pin 16 | RB5 — PORTB bit 5 (PPS-capable) |
| Pin 17 | RB6 — PORTB bit 6 (ICSPCLK / PPS-capable) |
| Pin 18 | RB7 — PORTB bit 7 (ICSPDAT / PPS-capable) |
| Pin 19 | VSS — Ground reference (second) |
| Pin 20 | VDD — Positive supply (3.0-3.6V LF) second |
| Pin 21 | RC0 — PORTC bit 0 (PPS-capable) |
| Pin 22 | RC1 — PORTC bit 1 (PPS-capable) |
| Pin 23 | RC2 — PORTC bit 2 (PPS-capable) |
| Pin 24 | RC3 — PORTC bit 3 (PPS-capable) |
| Pin 25 | RC4 — PORTC bit 4 (PPS-capable) |
| Pin 26 | RC5 — PORTC bit 5 (PPS-capable) |
| Pin 27 | RC6 — PORTC bit 6 (PPS-capable) |
| Pin 28 | RC7 — PORTC bit 7 (PPS-capable) |
Typical Applications
PIC18LF24K40-I/SP is suitable for 7 applications: Battery-Powered IoT Sensor Node, Capacitive Touch User Interface, Small BLDC Fan / Pump Motor Driver, LED Lighting Controller, Industrial 24V Sensor Signal Conditioner, Home Automation End Node, Low-Power Medical Wearable.
Battery-Powered IoT Sensor Node
The PIC18LF24K40-I/SP fits IoT wireless sensor endpoints where sub-uA sleep current and 3.3V native operation are essential. With XLP sleep below 1 uA and 64 MHz active compute from a coin cell, it reads temperature, humidity, or PIR sensors, runs on-device threshold logic via ADC2 with computation, and wakes only briefly to transmit over UART-attached LoRa or BLE modules. The 16 KB Flash accommodates sensor-fusion libraries plus Microchip's MLA Bluetooth/LoRa stacks, and PPS routes the wake-up interrupt to any GPIO without external glue.
Recommended
Capacitive Touch User Interface
Hardware CVD on the PIC18LF24K40-I/SP enables 24 capacitive touch channels with no external IC, reducing BOM by $0.30-$1.00 per board versus dedicated touch controllers. The ADC2 with computation engine offloads touch filtering from the CPU, while CWG and 7 PWM channels drive haptic or LED feedback in the same firmware. Designers use Microchip's mTouch libraries with PPS to map touch pads onto any GPIO, simplifying PCB layout in appliances, lighting keypads, and small consumer electronics where sealed glass-front panels replace mechanical buttons.
Recommended
Small BLDC Fan / Pump Motor Driver
The PIC18LF24K40-I/SP drives small BLDC or PMSM motors up to a few hundred watts using its 7 16-bit PWM channels, the CWG, and ZCD for back-EMF commutation. The 64 MHz core executes field-oriented control loops with 16 kHz switching frequency while staying under 70% CPU load, leaving headroom for sensor telemetry. PFC and protective limits (over-temperature, over-current) run on the dedicated WWDT and CWG shutdown path. The 28-SPDIP package suits through-hole industrial control boards where thermal cycling and field-serviceability matter.
Recommended
LED Lighting Controller
For smart LED fixtures and architectural lighting, the PIC18LF24K40-I/SP delivers 7 PWM channels to drive RGBW, tunable-white, and dim channels at 16-bit resolution with 0.01% step granularity. ADC2 with computation handles ambient-light sensing and color-temperature feedback, while the CWG generates glitch-free dimming ramps. I2C connects to standard lighting-sensor ICs, and 3.3V operation matches constant-current LED driver ICs directly. Designers use the Peripheral Pin Select feature to relocate SPI/UART pins for clean PCB routing.
Recommended
Industrial 24V Sensor Signal Conditioner
On a 24V industrial rail stepped down to 3.3V, the PIC18LF24K40-I/SP conditions signals from 4-20 mA loops, thermocouples, and bridge sensors. The 10-bit ADC2 with computation accelerates linearization math, hardware CVD supports capacitive level sensing, and the WWDT enforces a safe state on firmware faults. UART and SPI uplink to PLCs or industrial gateways. The Extended-temp PIC18LF24K40-E/SP (same package) is a true drop-in for outdoor cabinets reaching +125C inside enclosures.
Recommended
Home Automation End Node
In Matter, Zigbee, or Z-Wave end nodes, the PIC18LF24K40-I/SP provides the host MCU with XLP sleep below 1 uA to preserve coin-cell lifetime over multi-year deployments. PPS routes GPIOs to match any module pinout, the CWG generates precise dimming PWM for lights, and the on-chip ZCD enables AC-line zero-cross detection for TRIAC dimmers. 16 KB Flash fits Zigbee 3.0 and Matter application profiles plus a manufacturer-specific bootloader, simplifying OTA updates. Microchip's MPLAB X IDE supports FreeRTOS porting for richer stacks.
Recommended
Low-Power Medical Wearable
Battery-powered medical wearables such as continuous glucose monitors, pulse oximeters, and smart patches leverage the PIC18LF24K40-I/SP's 1.8V/16MHz low-power mode to extend battery life beyond 14 days on a single CR2032. The 10-bit ADC2 reads photoplethysmography (PPG) or electrochemical sensors, the WWDT enforces FDA-style fault recovery, and I2C drives low-power displays and BLE modules. Hardware CRC/Memory Scan protects firmware integrity. Drop-in to PIC18LF24K40-E/SP for higher operating-temperature skin-contact applications.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF24K40-I/SP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF25K40-I/SP | PIC18LF24K40-E/SP | PIC18F24K40-I/SP |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SPDIP | 28-SPDIP | 28-SPDIP | 28-SPDIP |
| Flash | 16 KB | 32 KB | 16 KB | 16 KB |
| RAM | 1 KB | 2 KB | 1 KB | 1 KB |
| Supply Voltage | 1.8-3.6 V | 1.8-3.6 V | 1.8-3.6 V | 2.3-5.5 V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +125C | -40C to +85C |
| Max CPU Frequency | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| PWM Channels | 7 (16-bit) | 7 (16-bit) | 7 (16-bit) | 7 (16-bit) |
Key Differentiators
- Hardware CVD for up to 24 capacitive touch channels without external IC (vs PIC18LF24K22-I/SP)
- Sub-uA XLP sleep current extends battery life beyond 5 years (vs PIC18F24K40-I/SP)
- 64 MHz CPU with hardware multiplier at 3.3V (vs PIC18F25K22-I/SP)
Design Notes
The PIC18LF24K40-I/SP operates at three voltage/frequency pairs: 3.0-3.6V at 64 MHz, 2.5V at 32 MHz, and 1.8V at 16 MHz. Lower VDD and CPU clock reduce core current substantially; Sleep current stays under 1 uA across all three. Design firmware to drop to 16 MHz during idle and only burst to 64 MHz for sampling or comms. Always decouple VDD with 100 nF X7R + 1 uF bulk ceramic within 5 mm of both VDD/VSS pairs.
Route the ICSPDAT/ICSPCLK lines (RB6/RB7) away from high-frequency switching traces and PWM outputs to prevent in-circuit programming noise. Use a 10k pull-up on MCLR and 100 nF decoupling on VPP. Place the 32.768 kHz crystal within 5 mm of SOSCO/SOSCI for stable RTCC operation. Keep analog ADC inputs short and isolated from PWM/digital traces with a ground guard ring to preserve 10-bit SNR.
Do not exceed 3.6V on the PIC18LF24K40-I/SP - the LF silicon is permanently damaged above this threshold. If your system rail is 5V, choose the PIC18F24K40-I/SP instead. Always configure unused I/O pins as digital outputs low to minimize current leakage. PPS selections must be unlocked via IOLOCK before being written; failing to do so silently ignores peripheral remap attempts. When migrating from PIC18F46K40 designs, note that PPS register mappings differ - consult the I/O chapter of the LF24K40 datasheet.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - choose PIC18F25K40 or higher-grade part for automotive. Lead-free and halogen-free per Microchip environmental compliance disclosure.
