PIC18LF26K40-I/SS
PIC18LF26K40-I/SS - 64KB Flash XLP 8-bit MCU | Microchip
The Microchip Technology PIC18LF26K40-I/SS is a low-power, high-performance 8-bit microcontroller from the PIC18 XLP 18K family, featuring 64 KB of Flash program memory, 4 KB of RAM, and 256 bytes of EEPROM in a 28-pin SSOP package. It integrates a rich peripheral set including a 10-bit ADC with Computation (ADCC), a 5-bit DAC, comparators, PWM, CCP, CWG, HLT, WWDT, SCAN/CRC, and ZCD, and operates up to 64 MHz across a 1.8 V to 3.6 V supply range.
What is a microcontroller (MCU)? A microcontroller is a single-chip computer that combines a CPU core, non-volatile program memory (Flash), working memory (RAM), data EEPROM, and a rich set of analog and digital peripherals on one die. The PIC18LF26K40 belongs to the PIC18 8-bit RISC family within the broader 8-bit MCU category of microcontrollers and embedded controllers in integrated circuits, optimized for low-power (XLP) general-purpose designs that need to run from a single Li-ion or 2xAA cell.
Key features include the proprietary eXtreme Low-Power (XLP) technology with nanoWatt XLP sleep currents below 50 nA typical, a Core Independent Peripherals (CIPs) block that offloads timing-critical tasks from the CPU, and direct memory access via the 10-bit ADCC for automated Capacitive Voltage Divider (CVD) touch sensing. The 28-SSOP package with 0.65 mm pitch is footprint-compatible across the PIC18F/LF26K40 family, allowing easy migration between F (Flash, 1.8-5.5 V) and LF (low-voltage Flash, 1.8-3.6 V) variants and between I (industrial -40 to +85 C) and E (extended -40 to +125 C) temperature grades.
Technically, the PIC18LF26K40 implements a Harvard-architecture RISC core with a 16-bit instruction word, an 8-level hardware stack, and a 31-level software stack, providing deterministic interrupt response and single-cycle execution for most instructions. The CWG, CCP, PWM and HLT peripherals can be wired together to drive power-conversion and motor-control topologies without CPU intervention, while the SCAN/CRC peripheral performs background memory integrity checks for functional-safety designs.
Typical applications include battery-powered IoT sensor nodes, low-power wireless remotes, consumer appliances with capacitive touch user interfaces, industrial control with LIN or UART bridges, and small motor-control boards. The wide peripheral integration lets a single PIC18LF26K40 replace a discrete MCU plus several support ICs, shrinking BOM cost and PCB area.
When designing with this part, place a 100 nF decoupling capacitor on each VDD pin within 3 mm, connect all VSS pins to a solid ground pour, and keep the MCLR pull-up within 25 mm of the pin. Choose the LF (1.8-3.6 V) variant for battery operation and the F (1.8-5.5 V) variant when the board must run from a regulated 5 V rail.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers evaluate the PIC18LF26K40-I/SS against the rest of the PIC18 K40 family and competing 8-bit MCUs.
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