PIC18LF45K42-E/ML
PIC18LF45K42-E/ML - 64MHz 32KB Flash 8-bit MCU | Microchip
The Microchip PIC18LF45K42-E/ML is an 8-bit PIC® XLP™ 18K microcontroller running at 64MHz with 32KB (16K × 16) of Flash program memory, 2KB of SRAM, and 256B of EEPROM, housed in a 44-pin QFN (8x8) package with exposed thermal pad. It operates from 1.8V to 3.6V and is designed for low-power and battery-friendly applications in the PIC18 LF 'K42 family.
An 8-bit microcontroller (MCU) is a small, self-contained computer-on-a-chip that integrates a CPU, program memory (Flash), data memory (RAM), non-volatile storage (EEPROM), and a rich set of peripherals such as timers, ADCs, communication interfaces, and GPIO. PIC18 microcontrollers use a RISC-based Harvard architecture; the 'K42 family adds Core Independent Peripherals (CIPs) that execute tasks without CPU intervention. The LF prefix denotes the 1.8V–3.6V low-voltage variant, with the F (3.0V–5.5V) variant being the PIC18F45K42. The 'K42 line falls within the broader PIC18 family > 8-bit PIC microcontrollers > Microcontrollers (MCU) > semiconductors taxonomy used by distributors.
Key features of the PIC18LF45K42-E/ML include a 12-bit ADC with Computation, a 5-bit DAC, three analog comparators with a DAC reference, zero-cross detect (ZCD), DMA controller, vectored interrupts, configurable logic cells (CLC), complementary waveform generator (CWG), 16-bit PWM, UART/SPI/I2C with PPS, watchdog timer (WWDT), scan/CRC, and idle/doze/peripheral module disable (PMD) power-saving modes. These peripherals are tuned for sensor nodes, motor control loops, lighting, and small motor/valve drivers.
The 'K42 architecture combines a high-performance 8-bit core (64MHz, 16 MIPS) with hardware acceleration through DMA and CIPs, enabling deterministic real-time response without loading the CPU. The peripheral pin select (PPS) allows flexible digital pin mapping, simplifying PCB layout when changing signal assignments. Together these blocks give designers a flexible platform for low-power embedded control.
Typical applications include low-power IoT sensor nodes, battery-powered instrumentation, white-goods and appliance controls, lighting and LED drivers, automotive body and sensor interfaces, sensor signal conditioning, and small brushed-DC or stepper motor control loops. The wide 1.8V–3.6V range supports single-cell Li-ion or 2× AA battery chemistries.
When designing with this part, ensure that the MCLR reset circuit and decoupling capacitors follow the datasheet typical application circuit. Verify that peripheral allocations via PPS do not conflict, and use the XLP sleep modes plus PMD for sub-µA standby currents in battery-powered products.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet alone, giving engineers and procurement teams a single source for selection, replacement, and sourcing decisions.
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