PIC18LF24K42T-I/SS - 8-bit 64MHz 16KB Flash MCU | Microchip
MPN: PIC18LF24K42T-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.34 | $2.34 |
| 10 | $2.1 | $21.00 |
| 100 | $1.78 | $178.00 |
| 500 | $1.49 | $745.00 |
| 1,000 | $1.22 | $1,220.00 |
PIC18LF24K42T-I/SS Overview
An 8-bit PIC microcontroller is a Harvard-architecture RISC MCU built around a 16-bit instruction word with single-cycle execution on most instructions. The PIC18 family represents the high-performance tier of Microchip's 8-bit portfolio, sitting above PIC16 and PIC10/12/16 in code density and peripheral integration. Within the power-management IC hierarchy it is classified as an MCU - a self-contained computing element that integrates CPU, memory, peripherals and interrupt logic on a single die, eliminating the need for external memory or glue logic.
Key features include 25 general-purpose I/O pins, two I2C/SPI interfaces, two UART modules, 10 PWM channels, 10-bit ADC with up to 24 channels, comparators and a zero-cross detect. The DMA controller moves data between memory and peripherals without CPU intervention, leaving the core free for application logic. The XLP sleep mode drops current consumption to the sub-uA range, making the part attractive for always-on sensor nodes and battery-powered IoT endpoints.
Typical applications include industrial sensor interfaces, low-power IoT nodes, USB-CDC bridge firmware, and small motor-control loops. When designing with this part, verify the SSOP-28 PCB land pattern against the IPC-7351 SSOP recommended footprint and ensure decoupling capacitance of at least 100nF is placed within 5mm of each supply pin. The internal 64MHz oscillator eliminates the need for an external crystal in most cost-sensitive designs, simplifying the BOM and reducing board area.
Drop-in alternatives for PIC18LF24K42T-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 PIC18LF24K42T-I/SS (same form factor and footprint) — differing in Package, ADC, DAC, Program Memory (Flash), MSL Level.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF24K42T-I/SO
✅ Drop-In✓ In Stock
$1.89 / Unit
View Datasheet →PIC18LF24K42-I/SS
✅ Drop-In✓ In Stock
$1.81 / Unit
View Datasheet →PIC18F24K42T-I/SS
✅ Drop-In✓ In Stock
$1.47 / Unit
View Datasheet →PIC18LF24K40T-I/SO
✅ Drop-In✓ In Stock
$1.86 / Unit
View Datasheet →PIC18LF24K40-I/SS
✅ Drop-In✓ In Stock
$1.27 / Unit
View Datasheet →PIC18LF24K42T-I/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 8-bit RISC |
| Maximum Clock Frequency | 64 MHz |
| Program Memory (Flash) | 16 KB (8K x 16) |
| Data RAM | 1 KB |
| Data EEPROM | 256 bytes |
| Operating Supply Voltage | 1.8 V to 3.6 V |
| Number of I/O Pins | 25 |
| ADC Resolution | 12-bit |
| Number of PWM Channels | 10 |
| Number of Timers | 10 |
| I2C Interfaces | 2 |
| SPI Interfaces | 2 |
| UART Modules | 2 |
| DMA Channels | 2 |
| Operating Temperature | -40C to +85C |
| Package | 28-pin SSOP |
| Mounting Type | Surface Mount |
PIC18LF24K42T-I/SS Pin Configuration
| Pin 1 | MCLR/RE3 — Master Clear (reset) / Port E bit 3 |
| Pin 2 | RA0 — Port A bit 0 / analog input |
| Pin 3 | RA1 — Port A bit 1 / analog input |
| Pin 4 | RA2 — Port A bit 2 / analog input |
| Pin 5 | RA3 — Port A bit 3 / analog input |
| Pin 6 | RA4 — Port A bit 4 / analog input |
| Pin 7 | RA5 — Port A bit 5 / analog input |
| Pin 8 | VSS — Ground reference |
| Pin 9 | RA7 — Port A bit 7 / oscillator |
| Pin 10 | RA6 — Port A bit 6 / oscillator |
| Pin 11 | RC0 — Port C bit 0 |
| Pin 12 | RC1 — Port C bit 1 |
| Pin 13 | RC2 — Port C bit 2 |
| Pin 14 | RC3 — Port C bit 3 / SPI clock |
| Pin 15 | RC4 — Port C bit 4 / SPI data |
| Pin 16 | RC5 — Port C bit 5 / SPI data |
| Pin 17 | RC6 — Port C bit 6 / UART TX |
| Pin 18 | RC7 — Port C bit 7 / UART RX |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage |
| Pin 21 | RB0 — Port B bit 0 / interrupt-on-change |
| Pin 22 | RB1 — Port B bit 1 / interrupt-on-change |
| Pin 23 | RB2 — Port B bit 2 / interrupt-on-change |
| Pin 24 | RB3 — Port B bit 3 / interrupt-on-change |
| Pin 25 | RB4 — Port B bit 4 / interrupt-on-change |
| Pin 26 | RB5 — Port B bit 5 / interrupt-on-change |
| Pin 27 | RB6 — Port B bit 6 / ICSP clock |
| Pin 28 | RB7 — Port B bit 7 / ICSP data |
Typical Applications
PIC18LF24K42T-I/SS is suitable for 6 applications: Industrial Sensor Interface Hub, Battery-Powered IoT Sensor Node, USB-CDC Bridge Firmware, Small Motor Control Drive Loop, Consumer Appliance User Interface, Medical Device Peripherals.
Industrial Sensor Interface Hub
The PIC18LF24K42T-I/SS fits industrial sensor interface applications because of its 12-bit ADC with up to 24 channels and two I2C/SPI interfaces, which allow simultaneous connection to multiple sensor types (temperature, pressure, humidity). The DMA controller moves sensor data into RAM without CPU intervention, enabling real-time monitoring while the core runs filtering logic. The 1.8V-3.6V supply range simplifies integration with 3.3V industrial sensor rails. The 64MHz instruction clock delivers 16 MIPS, sufficient for PID loops and sensor fusion math at sample rates up to 1 kHz.
Recommended
Battery-Powered IoT Sensor Node
The PIC18LF24K42T-I/SS is well-suited for battery-powered IoT sensor nodes because of its XLP (eXtreme Low Power) sleep modes that drop current into the sub-uA range, enabling multi-year battery life from a single 3V coin cell. The LF 1.8V minimum supply allows direct connection to two AA alkaline cells in series. The integrated 12-bit ADC and DMA offload sensor sampling without waking the core. Two UART modules simplify connectivity to BLE or LoRa transceivers; the 1KB RAM handles protocol buffers without external memory. The 28-SSOP package keeps board area minimal.
Recommended
USB-CDC Bridge Firmware
The PIC18LF24K42T-I/SS works in USB-CDC bridge firmware because of its 64MHz clock delivering 16 MIPS, sufficient for 12 Mbps USB Full-Speed traffic and serial protocol conversion in real time. The DMA channels offload USB endpoint buffering, freeing the core for protocol parsing. Two UART modules simultaneously bridge USB to RS-232, RS-485 or LIN peripherals. The 16KB Flash accommodates CDC stack plus user application code. The 1KB RAM handles typical 64-byte CDC buffers without flow-control stalls, suitable for diagnostic tools and industrial converters.
Recommended
Small Motor Control Drive Loop
The PIC18LF24K42T-I/SS handles small motor-control applications because of its 10 PWM channels and 12-bit ADC, sufficient for closed-loop BLDC or stepper control of fans and small pumps. The DMA samples current feedback without timing jitter, critical for FOC algorithms. The 16 MIPS instruction rate supports sinusoidal commutation at PWM frequencies up to 20 kHz. The 1.8V-3.6V supply works directly from a 2S Li-ion battery; for higher-voltage motors, the same silicon scales via external gate drivers.
Recommended
Consumer Appliance User Interface
The PIC18LF24K42T-I/SS fits consumer appliance user-interface boards because of its 25 GPIO pins supporting capacitive touch sensing, LED matrix driving, and rotary knob quadrature decoding without external logic. The two I2C interfaces connect to OLED displays and EEPROM storage; the SPI interface drives TFT LCDs at high refresh rates. The 1.8V-3.6V supply matches battery-backed appliance rails. The 10 PWM channels drive LED dimming, buzzer tones and backlight brightness; 16KB Flash holds UI state machines, look-up tables and bootloader.
Recommended
Medical Device Peripherals
The PIC18LF24K42T-I/SS supports medical device peripheral boards because of its 12-bit ADC precision, DMA for sensor data streaming, and reliable CIP (Core Independent Peripheral) hardware event response with predictable timing. The -40C to +85C operating range covers clinical environments. Two UART channels connect to Bluetooth modules and host controllers. The XLP sleep modes extend battery life in portable monitoring devices such as pulse oximeters and glucose meters. The 28-SSOP footprint simplifies medical PCBA, such that IPC Class 2 standards are respected.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF24K42T-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF24K42T-I/SO | PIC18LF24K42-I/SS | PIC18F24K42T-I/SS | PIC18LF24K40T-I/SO | PIC18LF24K40-I/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SSOP | 28-SOIC | 28-SSOP | 28-SSOP | 28-SOIC | 28-SSOP |
| Flash Memory | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| RAM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| Supply Voltage | 1.8V to 3.6V | 1.8V to 3.6V | 1.8V to 3.6V | 2.3V to 5.5V | 1.8V to 3.6V | 1.8V to 3.6V |
| Maximum Clock | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| DMA Controllers | Yes (2 channels) | Yes (2 channels) | Yes (2 channels) | Yes (2 channels) | No | No |
| ADC Resolution | 12-bit | 12-bit | 12-bit | 12-bit | 10-bit | 10-bit |
Key Differentiators
- Integrated DMA controllers with vectored interrupts (vs PIC18LF24K40T-I/SO)
- 12-bit ADC resolution vs 10-bit on K40 generation (vs PIC18LF24K40-I/SS)
- Wide 1.8V minimum supply for battery-powered designs (vs PIC18F24K42T-I/SS)
Design Notes
Decouple VDD (pin 20) and VSS (pins 8, 19) with a 100nF ceramic capacitor placed within 5mm of each supply pin, plus a 10uF bulk capacitor on the main 3.3V rail. The PIC18LF24K42T-I/SS has two VSS pins that MUST both be connected to ground for proper operation. Use a low-ESR ceramic such as X7R dielectric; avoid Y5V which loses capacitance with bias voltage. For battery applications, place a 100KΩ pull-up on MCLR (pin 1) to VDD through a 1N4148 diode for power-on reset integrity.
Route the ICSP clock and data lines (RB6/RB7, pins 27/28) away from switching noise sources and keep trace lengths under 50mm for reliable in-circuit programming. Place the ICSP connector at the edge of the PCB for probe access during firmware development. The 28-SSOP package has a 0.65mm pin pitch - follow IPC-7351 SSOP land pattern recommendations with at least 0.2mm trace-to-pad spacing. Add a ground pour on the top layer under the IC body for thermal dissipation and noise immunity.
Do not confuse the SS (28-SSOP) package with the SO (28-SOIC) package - they have different PCB land patterns and are NOT interchangeable despite identical pin counts. The SS suffix means 0.65mm pitch (shrink small outline); SO is 1.27mm pitch. When porting code between PIC18LF24K42 and PIC18F24K42, the F/LF voltage range difference (2.3V vs 1.8V minimum) requires checking any 1.8V-rated external components. Always verify CONFIG words match your application - the oscillator selection and WDT settings are easily misconfigured.
Compliance Information
RoHS and REACH compliance per Microchip product declarations. Industrial temperature grade -40C to +85C. Not AEC-Q100 qualified for automotive; choose PIC18F24K42-E/SP for extended temperature variants. Halogen-free status not explicitly declared in available web data.
