PIC18LF24K40-I/SS - 16KB Flash 8-bit XLP MCU | Microchip
MPN: PIC18LF24K40-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.94 | $1.94 |
| 10 | $1.78 | $17.80 |
| 100 | $1.56 | $156.00 |
| 500 | $1.41 | $705.00 |
| 1,000 | $1.27 | $1,270.00 |
PIC18LF24K40-I/SS Overview
What is a microcontroller (MCU)? A microcontroller is a single-chip computer containing a CPU core, non-volatile program memory (Flash), volatile data memory (RAM), and a rich set of peripherals such as ADC, timers, communication interfaces, and I/O pins. Within Microchip's portfolio the PIC18F family sits in the 8-bit PIC architecture hierarchy above baseline PIC10/12/16 and below PIC24/dsPIC 16-bit parts. The PIC18LF24K40 belongs to the K40 sub-family distinguished by peripheral touch controller (PTC) capability, configurable logic cell (CLC), and the XLP nanoWatt technology. This taxonomy places it in the broader semiconductor category of embedded microcontrollers.
Key features of the PIC18LF24K40-I/SS include a 10-bit ADC with up to 24 channels, a 5-bit DAC, two analog comparators, a zero-cross detect (ZCD) module, 16-bit PWM with multiple independent outputs, CCP, CWG (complementary waveform generator), hardware limit timer (HLT), windowed watchdog timer (WWDT), scan/CRC, and up to 25 I/O pins. It supports I2C, SPI (MSSP), and EUSART connectivity, plus PPS (peripheral pin select) for flexible routing.
Architecturally the device uses a Harvard RISC core with a hardware multiplier, executes most instructions in a single cycle, and integrates the MIPS-style PIC18 instruction set with 79 instructions. The 64 MHz internal oscillator eliminates external crystal needs in many designs, while the XLP sleep currents allow battery lifetimes measured in years.
Typical applications include IoT sensor nodes, consumer appliances, low-power wireless control panels, touch-button user interfaces, and industrial sensor conditioning. Designers also use it in motor and lighting control where CWG and PWM matter.
When designing with this part, verify that the 28-pin SSOP land pattern is correct for your PCB and that all VDD/VSS pins are decoupled with 100 nF ceramic capacitors placed within 3 mm of each pin. Take care that the LVP (low-voltage programming) configuration bit is enabled if you intend to use ICSP without a high-voltage VPP signal.
Drop-in alternatives for PIC18LF24K40-I/SS — 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/SS (same form factor and footprint) — differing in ADC, Package, Operating Temperature, Program Memory (Flash), DAC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F24K40-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF24K40-I/SP
✅ Drop-In✓ In Stock
$1.55 / Unit
View Datasheet →PIC18LF24K40-E/SO
✅ Drop-In✓ In Stock
$1.28 / Unit
View Datasheet →PIC18LF24K40-I/MV
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF24K22-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF24J10-I/SS
✅ Drop-In✓ In Stock
$2.45 / Unit
View Datasheet →PIC18LF23K22-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF24K40-I/SS Maximum Ratings & Electrical Characteristics
| Product Family | PIC18F K-series (K40 sub-family) |
| Core | PIC18 8-bit RISC |
| Program Memory (Flash) | 16 KB |
| Data SRAM | 1 KB |
| Data EEPROM | 256 bytes |
| Maximum CPU Frequency | 64 MHz |
| Supply Voltage (LF) | 1.8 V to 3.6 V |
| Operating Temperature Range | -40C to +85C (Industrial) |
| I/O Pins | 25 |
| ADC | 10-bit, up to 24 channels |
| DAC | 5-bit, 1 channel |
| Comparators | 2 |
| Zero-Cross Detect (ZCD) | 1 module |
| PWM | 16-bit, multiple independent outputs |
| Communication | 1x MSSP (I2C/SPI), 1x EUSART |
| Package | 28-pin SSOP (SS) |
| Mounting Type | Surface Mount |
| MSL Level | MSL1 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Lead-Free / Halogen-Free | Yes / Yes |
PIC18LF24K40-I/SS Pin Configuration
| Pin 1 | RA0/ICSPDAT — Digital I/O / ICSP data / analog input |
| Pin 2 | RA1/ICSPCLK — Digital I/O / ICSP clock / analog input |
| Pin 3 | RA2 — Digital I/O / analog input |
| Pin 4 | RA3 — Digital I/O / analog input |
| Pin 5 | RA4 — Digital I/O / analog input |
| Pin 6 | RA5 — Digital I/O / analog input |
| Pin 7 | RA6 — Digital I/O / analog input |
| Pin 8 | RA7 — Digital I/O / analog input |
| Pin 9 | VSS — Ground reference |
| Pin 10 | VDD — Positive supply (1.8 V to 3.6 V) |
| Pin 11 | RB0 — Digital I/O / analog input / interrupt |
| Pin 12 | RB1 — Digital I/O / analog input / interrupt |
| Pin 13 | RB2 — Digital I/O / analog input / interrupt |
| Pin 14 | RB3 — Digital I/O / analog input / interrupt |
| Pin 15 | RB4 — Digital I/O / analog input / interrupt |
| Pin 16 | RB5 — Digital I/O / analog input / interrupt |
| Pin 17 | RB6/PGC — Digital I/O / ICSP clock |
| Pin 18 | RB7/PGD — Digital I/O / ICSP data |
| Pin 19 | RC0 — Digital I/O / analog input |
| Pin 20 | RC1 — Digital I/O / analog input |
| Pin 21 | RC2 — Digital I/O / analog input |
| Pin 22 | RC3 — Digital I/O / analog input |
| Pin 23 | RC4 — Digital I/O / analog input |
| Pin 24 | RC5 — Digital I/O / analog input |
| Pin 25 | RC6 — Digital I/O / analog input |
| Pin 26 | RC7 — Digital I/O / analog input |
| Pin 27 | VSS — Ground reference (second bond wire) |
| Pin 28 | VDD — Positive supply (second bond wire) |
Typical Applications
PIC18LF24K40-I/SS is suitable for 6 applications: Battery-Powered IoT Sensor Nodes, Touch-Button User Interface, LED Lighting and PWM Dimming Control, Industrial Sensor Conditioning, Consumer Appliance Control, Portable Medical Monitoring Devices.
Battery-Powered IoT Sensor Nodes
The PIC18LF24K40-I/SS fits battery-powered IoT sensor nodes because of its XLP nanoWatt sleep current below 100 nA typical and 1.8 V to 3.6 V VDD range. The 10-bit ADC with up to 24 channels digitizes sensor signals from temperature, humidity, or light sensors without external amplification; the MSSP and EUSART handle I2C/SPI sensors or low-power wireless modules. At typical duty cycles of 1% the device can run for years on a CR2032, making it a practical MCU for remote wireless sensor nodes where battery replacement cost dominates.
Recommended
Touch-Button User Interface
The PIC18LF24K40-I/SS is ideal for capacitive touch-button user interfaces because its K40 series integrates the Peripheral Touch Controller (PTC) with up to 25 touch channels. PTC supports hardware-driven proximity and gesture detection while the CPU sleeps, allowing sub-uA standby current in battery-powered appliances and consumer devices. The 16 KB Flash accommodates Microchip's mTouch library for water-tolerant buttons, sliders, and 3D gestures.
Recommended
LED Lighting and PWM Dimming Control
In LED lighting and PWM dimming applications the PIC18LF24K40-I/SS delivers multiple independent 16-bit PWM outputs alongside the CWG (complementary waveform generator) for half-bridge LED driver pairs. Designers can drive RGBW color-mixing LEDs with hardware-generated dead-time control, freeing the CPU to handle communication, diagnostics, and thermal feedback. The 5-bit DAC and comparators enable constant-current regulation closed loops, while the EUSART supports DMX or 0-10 V dimming interfaces.
Recommended
Industrial Sensor Conditioning
The PIC18LF24K40-I/SS suits industrial sensor conditioning where its 24-channel 10-bit ADC with computation (ADC2) offloads filter math from the CPU. The integrated zero-cross detect (ZCD) module supports phase-controlled TRIAC firing for solid-state relays, and the hardware limit timer (HLT) plus WWDT enable safe shutdown for motor control applications. Industrial-grade -40C to +85C operation covers most factory environments.
Recommended
Consumer Appliance Control
The PIC18LF24K40-I/SS works well in consumer appliance control (coffee makers, washing machines, microwaves) thanks to its mix of PWM, ADC, comparators, and CLC configurable logic for custom timing. The CWG peripheral drives power semiconductors directly without external glue logic, reducing BOM cost. Combined with the PIC18 instruction set's deterministic interrupt latency, the device produces reliable HMI response times for capacitive touch panels and rotary encoders.
Recommended
Portable Medical Monitoring Devices
The PIC18LF24K40-I/SS is well-suited to portable medical monitoring (pulse oximeters, blood pressure monitors, wearable patches) where its low sleep current extends battery life and the 10-bit ADC captures sensor signals from optical or pressure transducers. Hardware CRC and scan routines in the K40 family support reliable data integrity for health measurements; the 1.8 V minimum VDD allows direct operation from single-cell alkaline or rechargeable coin cells common in wearables.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF24K40-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F24K40-I/SS | PIC18LF24K40-I/SP | PIC18LF24K40-E/SO | PIC18LF24K40-I/MV | PIC18LF24K22-I/SS | PIC18LF24J10-I/SS | PIC18LF23K22-I/SS |
|---|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SSOP-28 (SS) | SSOP-28 (SS) - same | SPDIP-28 (SP) - different | SSOP-28 (SO) - same | UQFN-28 (MV) - different | SSOP-28 (SS) - same | SSOP-28 (SS) - same | SSOP-28 (SS) - same |
| Flash | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB | 8 KB | 16 KB | 8 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 768 B | 1 KB | 512 B |
| VDD Range | 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 | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 2.0 V to 3.6 V | 1.8 V to 3.6 V |
| Max CPU Frequency | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 40 MHz | 64 MHz |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +125C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Touch (PTC) | Yes | Yes | Yes | Yes | Yes | No | No | No |
Key Differentiators
- Wider VDD range from 1.8 V to 3.6 V with XLP sleep currents below 100 nA (vs PIC18F24K40-I/SS)
- Higher 64 MHz maximum CPU clock (vs PIC18LF24J10-I/SS)
- Larger 1 KB SRAM and 256 B EEPROM (vs PIC18LF23K22-I/SS)
Design Notes
Estimated: at 64 MHz active mode the PIC18LF24K40-I/SS draws approximately 8 mA; at 32 kHz sleep it drops to sub-uA. For a 3.3 V supply, select an LDO such as Microchip MCP1700 or MCP1825 with low quiescent current (under 2 uA). Decouple each VDD pin with a 100 nF X7R ceramic capacitor placed within 3 mm; add a bulk 1 uF to 10 uF tantalum or ceramic at the supply entry point for transient suppression.
Place a continuous ground plane directly under the SSOP-28 footprint and route digital signals on inner layers to keep IO traces short. Keep ICSP lines PGC and PGD away from switching power lines to avoid programming noise; Microchip recommends a 10 kohm pull-up on MCLR to prevent unintended resets in noisy environments. Maintain at least 0.5 mm clearance between analog inputs and digital signals for ADC accuracy.
When using Low-Voltage Programming (LVP) on the PIC18LF24K40-I/SS, the LVP configuration bit must remain enabled or high-voltage entry is required. All VDD and VSS pins must be connected even if unused, per Microchip ICSP specification. The ADC reference voltage should not exceed VDD by more than 0.3 V to avoid damage; for 1.8 V operation disable the 1.2 V FVR and use VDD as VREF for ADC.
Compliance Information
Industrial temperature grade -40C to +85C. AEC-Q100 qualified variants not available in PIC18LF24K40 family; for automotive use consider PIC18F46K40 or automotive-grade PIC18 series.
