PIC18LF26K42-I/SP
PIC18LF26K42-I/SP - 64KB Flash 8-bit XLP MCU, 28-SPDIP | Microchip
The Microchip Technology PIC18LF26K42-I/SP is an 8-bit PIC18 XLP microcontroller featuring 64KB Flash, 4KB RAM, and 1KB EEPROM in a 28-pin SPDIP package, running at up to 64MHz. It integrates 12-bit ADC2, 5-bit DAC, comparators, PWM, DMA, vectored interrupts, and Core Independent Peripherals (CIPs) into a low-power eXtreme Low Power (XLP) architecture optimized for battery-powered and energy-harvesting designs.
What is a PIC18 XLP microcontroller? PIC18 XLP is Microchip's enhanced 8-bit microcontroller family built on a modified Harvard architecture with C compiler-friendly instruction set, combining large memory with advanced peripherals. Within the broader taxonomy, PIC18 belongs to 8-bit microcontrollers -> microcontrollers (MCUs) -> embedded processors -> semiconductors. The 'LF' prefix denotes the low-voltage (1.8V-3.6V) variant, while XLP denotes deep-sleep currents down to nanoamp levels, targeting IoT, wearables, and portable instrumentation.
Key features include 64MHz internal oscillator, four 16-bit timers, two I2C, two SPI, two UART, 12-bit ADC2 with computation, 5-bit DAC, three op-amps (selected packages), DMA controller, vectored interrupts with hardware context save, and on-chip CIPs such as CWG, NCO, and PWM. The 28-SPDIP package brings 25 programmable I/O pins through Peripheral Pin Select (PPS), allowing flexible routing of digital peripherals to physical pins.
Technically, the K42 family uses a 14-stage instruction pipeline with single-cycle ALU operations and hardware multiplier, supporting both C and assembly development. The DMA engine moves data between memory and peripherals without CPU intervention, freeing the core for low-power sleep. The ADC2 includes averaging, oversampling, and threshold comparisons for sensor conditioning without external DSP.
Typical applications include IoT sensor nodes, low-power wireless sensor hubs, battery-powered medical wearables, HVAC controls, smart energy metering, and USB-to-UART bridges. The wide peripheral set makes it equally suitable for industrial HMI front-ends and consumer white-goods controllers.
When designing with this part, plan for PPS reassignment before committing PCB traces - the same silicon can map UART, I2C, or SPI to almost any I/O pin, but that mapping must be set in firmware. Choose the LF variant only if your system rail is <=3.6V; otherwise migrate to the PIC18F26K42 (F = 2.3V-5.5V).
This page synthesizes verified distributor pricing, drop-in alternatives from the same K42 family, and practical design notes not found in the standalone datasheet, helping engineers select, source, and integrate the PIC18LF26K42-I/SP faster.
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