PIC18LF27K42-E/SP
PIC18LF27K42-E/SP - 64MHz 8-Bit XLP MCU, 128KB Flash | Microchip
The Microchip Technology PIC18LF27K42-E/SP is an 8-bit RISC microcontroller from the PIC18F/LF2X/4X/5XK42 family, operating up to 64MHz with 128KB Flash, 8KB RAM, and 1KB EEPROM in a 28-pin SPDIP (0.300 inch / 7.62mm) through-hole package. It integrates a 12-bit ADC2 with Computation (ADC2), DAC, comparators, DMA, Zero-Cross Detect (ZCD), CWG, PWM, and Vector Interrupts for high-performance mixed-signal embedded control.
An 8-bit microcontroller (MCU) is a small, low-power computer-on-a-chip built around an 8-bit data path. In the semiconductor hierarchy, MCUs sit inside the broad category of embedded processors -> microcontrollers -> 8-bit MCUs. The "PIC" prefix is Microchip's proprietary Harvard-architecture RISC core, while "18" denotes the high-performance family with linear memory, C-compiler friendliness, and rich peripherals. The "LF" letter indicates the low-voltage variant (1.8V-3.6V VDD), while the "K42" sub-family adds XLP (eXtreme Low Power) technology for battery-friendly designs.
Key features of the PIC18LF27K42-E/SP include: 64MHz internal oscillator with PLL, 128KB self-programmable Flash (64K x 16 words), 8KB SRAM, 1KB EEPROM, 12-bit ADC2 with up to 24 channels, 5-bit/8-bit DAC, 2 comparators, DMA controller, vectored interrupts, Peripheral Pin Select (PPS), UART/SPI/I2C, Complementary Waveform Generator (CWG), High-Side Low-Side Timer (HLT), Windowed WWDT, CRC/SCAN, IDLE/DOZE/PMD power modes, and Math Accelerator (MAC). The 28-SPDIP footprint matches the legacy PIC18 28-pin DIP standard for breadboard-friendly prototyping and field replacement.
Architecturally, the K42 series uses a 16-bit modified Harvard core with a 31-level hardware stack, hardware multiplier, and an interrupt controller supporting vectored priorities. Peripherals are mapped via the PPS matrix, which lets nearly any digital peripheral function be assigned to most I/O pins, simplifying PCB routing and BOM reuse across the family.
Typical applications include low-power IoT sensor nodes, industrial control and HMI panels, automotive body and LIN nodes, battery-powered instrumentation, LED lighting controllers, USB-CDC human-interface devices, and consumer white-goods motor control. Designers favor this part when migrating legacy PIC18F code while gaining modern peripherals and aggressive low-power modes.
When designing with this MCU, plan the VDD rail for 1.8V-3.6V (the LF variant), provide a 100nF decoupling capacitor near each power pin, and assign PPS mappings early in firmware to lock the PCB layout. For the automotive -E (extended) grade, ambient temperature spans -40°C to +125°C.
This page synthesizes the official Microchip datasheet family specifications with verified distributor pricing, drop-in alternatives within the K42 family, and practical design notes not found in a single datasheet excerpt.
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