PIC18LF24K40-E/SO - 8-bit XLP MCU 16KB Flash 28-SOIC | Microchip
MPN: PIC18LF24K40-E/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.94 | $1.94 |
| 10 | $1.79 | $17.90 |
| 100 | $1.59 | $159.00 |
| 500 | $1.42 | $710.00 |
| 1,000 | $1.28 | $1,280.00 |
PIC18LF24K40-E/SO Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory (Flash), volatile data memory (RAM), EEPROM for user data, and a set of analog and digital peripherals around a Harvard architecture core. PIC18 MCUs sit within Microchip's PIC family hierarchy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. They are widely deployed where deterministic timing, low power consumption, and small package size matter more than raw compute throughput.
Key features include a 10-bit ADC with Computation (ADCC) supporting Capacitive Voltage Divider (CVD) for advanced touch sensing, a 5-bit DAC, two comparators, PWM, CCP, CWG (Complementary Waveform Generator), HLT (Hardware Limit Timer), Windowed Watchdog Timer (WWDT), CRC/SCAN, Zero-Cross Detection (ZCD), and Peripheral Pin Select (PPS) for flexible signal routing. Communication is provided by EUSART, SPI, and I2C. The XLP core enables typical sleep currents in the nanoamp range.
The PIC18LF24K40 architecture uses an enhanced mid-range 8-bit core with a modified Harvard bus, hardware multiplier, and 31-level hardware stack, supporting C and assembly development under MPLAB X IDE with the XC8 toolchain. PPS allows peripheral signals to be remapped to multiple I/O pins, simplifying PCB layout. The device operates across 1.8 V to 3.6 V (LF variant), making it ideal for 2-cell battery or regulated 3.3 V systems.
Typical applications include battery-powered IoT sensor nodes, capacitive touch user interfaces, low-power remote controls, HVAC sensor transmitters, small home appliances, and industrial sensor conditioning. The combination of ADCC touch support and XLP sleep current suits wearables and energy-harvesting designs.
When designing with this device, allocate adequate decoupling (100 nF plus 1 uF near VDD) and respect the 1.8 V minimum at full speed. Use PPS to optimize pin assignments for the application rather than hardwiring peripherals to multiple PIC pins. For touch electrodes, follow the CVD layout guidelines in the datasheet.
This page synthesizes distributor pricing, parametric comparison, and design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC18LF24K40-E/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 PIC18LF24K40-E/SO (same form factor and footprint) — differing in ADC, Package, Program Memory (Flash), Communication, Comparators.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F24K40-E/SO
✅ Drop-In✓ In Stock
$1.2 / Unit
View Datasheet →PIC18LF24K40-E/SP
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18LF25K40-E/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF24K40-E/SO Maximum Ratings & Electrical Characteristics
| Product Family | PIC18 (8-bit XLP) |
| Core | PIC18 8-bit enhanced mid-range |
| CPU Speed | 64 MHz (16 MIPS) |
| Program Memory (Flash) | 16 KB (8K x 14) |
| RAM | 1 KB |
| EEPROM | 256 B |
| Supply Voltage (LF) | 1.8 V to 3.6 V |
| ADC | 10-bit with Computation (ADCC), supports CVD touch |
| DAC | 5-bit |
| Comparators | 2 |
| Communication | EUSART, SPI, I2C |
| PWM / CCP / CWG | PWM, CCP, Complementary Waveform Generator |
| Special Peripherals | WWDT, CRC/SCAN, ZCD, PPS, HLT |
| Operating Temperature | -40C to +125C (E = Extended) |
| Package | 28-pin SOIC (0.295", 7.50 mm width) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC18LF24K40-E/SO Pin Configuration
| Pin 1 | MCLR/RE3 — Master Clear with internal pull-up or digital I/O RE3 |
| Pin 2 | RA0 — I/O with analog input |
| Pin 3 | RA1 — I/O with analog input |
| Pin 4 | RA2 — I/O with analog input |
| Pin 5 | RA3 — I/O with analog input |
| Pin 6 | RA4 — I/O |
| Pin 7 | RA5 — I/O |
| Pin 8 | RA6 — I/O |
| Pin 9 | RA7 — I/O |
| Pin 10 | VSS — Ground reference |
| Pin 11 | RB0 — I/O with interrupt-on-change |
| Pin 12 | RB1 — I/O with interrupt-on-change |
| Pin 13 | RB2 — I/O with interrupt-on-change |
| Pin 14 | RB3 — I/O with interrupt-on-change |
| Pin 15 | RB4 — I/O with interrupt-on-change |
| Pin 16 | RB5 — I/O with interrupt-on-change |
| Pin 17 | RB6 — I/O with interrupt-on-change, ICDCLK |
| Pin 18 | RB7 — I/O with interrupt-on-change, ICDDAT |
| Pin 19 | VSS — Ground reference (second VSS pin) |
| Pin 20 | VDD — Positive supply voltage |
| Pin 21 | RC0 — I/O |
| Pin 22 | RC1 — I/O |
| Pin 23 | RC2 — I/O |
| Pin 24 | RC3 — I/O |
| Pin 25 | RC4 — I/O |
| Pin 26 | RC5 — I/O |
| Pin 27 | RC6 — I/O |
| Pin 28 | RC7 — I/O |
Typical Applications
PIC18LF24K40-E/SO is suitable for 6 applications: Battery-Powered IoT Sensor Node, Capacitive Touch User Interface, HVAC Sensor Transmitter, Low-Power Remote Control, Industrial Sensor Conditioning, Small Home Appliance Controller.
Battery-Powered IoT Sensor Node
The PIC18LF24K40-E/SO fits battery-powered IoT sensor nodes because its XLP core delivers nanoamp sleep currents and 1.8 V operation allows 2 x AA cells to drain below 2.0 V. The 16 KB Flash hosts a sensor + radio driver stack while the 10-bit ADCC digitizes analog sensors with hardware averaging. The 28-SOIC footprint gives compact PCB integration for sub-coin-cell footprints.
Recommended
Capacitive Touch User Interface
The PIC18LF24K40-E/SO is purpose-built for capacitive touch UI via its ADCC peripheral implementing Capacitive Voltage Divider (CVD) techniques. Touch buttons, sliders, and proximity wake-on-approach can run with no external touch IC, lowering BOM cost. The 64 MHz core provides responsive scan latency and the 16 KB Flash stores touch firmware and UI state machines.
Recommended
HVAC Sensor Transmitter
For HVAC sensor transmitters the PIC18LF24K40-E/SO's XLP sleep mode enables multi-year battery life on 2 x AA cells while its 10-bit ADCC digitizes temperature and humidity sensors with hardware oversampling. The 5-bit DAC generates 0-5 V proportional outputs for legacy 4-20 mA loops when used with the F variant, and EUSART connects to wired HVAC bus networks.
Recommended
Low-Power Remote Control
The PIC18LF24K40-E/SO fits coin-cell-powered remote controls because its nanoamp sleep currents and 1.8 V minimum extend battery life to multi-year horizons. The integrated IR-capable PWM and EUSART drive infrared LEDs directly, while the ADCC supports low-battery voltage monitoring without external ADC chips. PPS remaps peripherals to optimize PCB layout for compact enclosures.
Recommended
Industrial Sensor Conditioning
For industrial sensor signal conditioning the PIC18LF24K40-E/SO offers 10-bit ADCC for transducer readout, hardware comparators for threshold detection, and ZCD for AC-mains synchronization. The CRC/SCAN peripheral ensures data integrity over noisy factory buses, while SPI/I2C connect to digital sensors or industrial EEPROM. Use the PIC18F24K40-E/SO when 5 V tolerance is required.
Recommended
Small Home Appliance Controller
The PIC18LF24K40-E/SO drives small home appliances like coffee makers, blenders, and air purifiers because its CWG peripheral generates complementary PWM for motor control, its 5-bit DAC trims analog setpoints, and its compact 28-SOIC fits space-constrained enclosures. The WWDT windowed watchdog provides IEC 60730 safety compliance for Class B appliances.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF24K40-E/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F24K40-E/SO | PIC18LF24K40-E/SP | PIC18LF25K40-E/SO |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (0.295") | 28-SOIC (0.295") - same | 28-SPDIP - through-hole | 28-SOIC (0.295") - same |
| Supply Voltage | 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 |
| Flash | 16 KB | 16 KB | 16 KB | 32 KB |
| RAM | 1 KB | 1 KB | 1 KB | 2 KB |
| CPU Speed | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| ADC | 10-bit ADCC | 10-bit ADCC | 10-bit ADCC | 10-bit ADCC |
| XLP / Low-Power | Yes (LF variant) | Yes (F variant) | Yes (LF variant) | Yes (LF variant) |
Key Differentiators
- Lowest voltage range in the 28-SOIC PIC18 K40 family (vs PIC18F24K40-E/SO)
- Cost-optimized memory vs 25K40 variant (vs PIC18LF25K40-E/SO)
- Same die in through-hole package for prototyping (vs PIC18LF24K40-E/SP)
Design Notes
Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 20), with a 1 uF bulk capacitor on the same rail. For battery-powered designs, use the PIC18LF variant's 1.8 V minimum to drain cells below 2.0 V. Configure unused pins as outputs low to minimize leakage current, and route ADC inputs through PPS to allow power-down of unused channels.
Do not operate the PIC18LF24K40 above 64 MHz or below 1.8 V - both violate the LF voltage/frequency derating curve. When migrating to the PIC18F24K40-E/SO ensure the rail voltage is 2.3 V or higher, or the Brown-Out Reset (BOR) will trigger continuously. Use PPS to remap peripherals rather than hardwiring to avoid PCB respins when the firmware demands pin reassignment.
For capacitive touch via the ADCC peripheral, follow the CVD layout guidelines in the datasheet: keep touch traces short, surround them with a hatched ground pour, and route away from switching signals. Add a 10-100 k series resistor on the touch pin to suppress EMI. Use the hardware oversampling feature to improve SNR rather than software averaging to reduce CPU wake time and total energy per scan.
The PIC18LF24K40-E/SO is a low-power CMOS device and thermal management is rarely an issue, but in extended temperature (-40C to +125C) industrial applications verify timing margins with the temperature-voltage derating curves in the datasheet. Above 85C ambient, the maximum CPU frequency decreases; derate accordingly. The 28-SOIC package has good thermal conduction through its leads for moderate-power designs.
Compliance Information
RoHS and REACH compliance standard for Microchip PIC18 K40 family. Not AEC-Q100 qualified - select -V (automotive) suffix variants for AEC-Q100.
