PIC18F44K20T-I/PT
PIC18F44K20T-I/PT - 8-bit 64MHz 16KB Flash MCU 44-TQFP
The Microchip Technology PIC18F44K20T-I/PT is an 8-bit PIC18 RISC microcontroller with 16KB (8K x 16) of Flash program memory, 768 bytes of SRAM, and 256 bytes of EEPROM, running at up to 64 MHz (16 MIPS) in a 44-pin TQFP (10x10 mm) package. It operates from 1.8V to 3.6V (with extended 1.8V-5.5V range) and provides 36 digital I/O pins, a 10-bit ADC with up to 14 channels, and nanoWatt XLP extreme low-power technology for battery-friendly designs. The "T" suffix denotes tape-and-reel packaging, while "I" indicates the industrial -40C to +85C operating temperature range.
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and programmable peripherals on one silicon die. Within the broader embedded taxonomy, the PIC18F44K20 sits in the 8-bit MCU class, which competes with 16-bit and 32-bit MCUs for cost- and power-sensitive applications. Microchip's enhanced PIC18 core combines a 16-bit instruction word with 8-bit data paths, achieving up to 16 MIPS throughput while retaining the deterministic interrupt model that makes PIC MCUs popular in real-time control.
Key features include 16 KB Flash with self-programmability, 768 B SRAM, 256 B EEPROM, two USART modules, one MSSP (SPI/I2C), two CCP modules, and an enhanced 10-bit ADC with up to 14 channels. The nanoWatt XLP technology delivers typical sleep currents below 100 nA, and multiple low-power modes (Run, Idle, Sleep, and Deep Sleep with RTCC) allow designers to extend battery life in standby-heavy applications. Hardware multipliers and C-friendly instruction set extensions ease code density for embedded C compilers.
The PIC18F44K20 uses Microchip's enhanced Harvard architecture with a 16-bit program path and an 8-bit data path, allowing single-cycle execution of most instructions. An internal 16 MHz oscillator and 4x PLL support 64 MHz operation without external crystals; combined with the 31 kHz low-power internal oscillator for low-power Run mode, this provides designers flexible clocking without external components.
Typical applications include industrial sensor nodes, low-power remote controls, battery-powered instrumentation, automotive body controllers, consumer appliances, and USB-to-UART bridges (using the MSSP and USART peripherals). The 36 I/O count comfortably drives matrix keypads, character LCDs, and small graphic OLEDs while leaving pins for analog sensors and serial connectivity.
When designing with this MCU, reserve one timer for the RTCC (with external 32.768 kHz crystal) if you need a real-time clock, and allocate the MSSP channel carefully between SPI and I2C peripherals. The 44-pin TQFP footprint matches the PIC18F45K20, PIC18F46K20, PIC18F44J50, and PIC18F43K20 families, enabling straightforward upgrades along the memory/peripheral ladder. Pricing is approximately $5.45 at qty-1 as of 2026-09-27 per DigiKey/Mouser listings.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
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