PIC16F819-I/SOTSL
PIC16F819-I/SOTSL - 8-bit MCU, 3.5KB Flash, 20MHz | Microchip
The Microchip Technology PIC16F819-I/SOTSL is an 8-bit Flash microcontroller in the PIC16F family, featuring 3.5 KB (2K x 14) of program memory, 256 bytes of RAM, and 256 bytes of EEPROM, packaged in an 18-pin SOIC with 0.295 inch (7.50 mm) body width. It executes instructions in a 200 ns cycle time and runs at up to 20 MHz oscillator frequency. The device includes an 8 MHz internal oscillator, 16 general-purpose I/O pins, one Capture/Compare/PWM (CCP) module, a Synchronous Serial Port (SSP) configurable as SPI or I2C, and a 10-bit Analog-to-Digital Converter with 5 input channels.
An 8-bit microcontroller (MCU) is a programmable processor built around an 8-bit data path that integrates CPU core, non-volatile program memory, working RAM, and a curated set of peripherals onto a single IC. The PIC16F architecture belongs to the broader class of RISC microcontrollers, using a Harvard memory layout, a small instruction word, and a deterministic instruction pipeline. Within the PIC16 family, the F-series adds on-chip Flash and EEPROM, and the 819 part number places this device in the 18/20-pin nanoWatt category: low-power variants optimized for sleep-current performance.
Key features include 200 ns instruction execution, a wide 2.0 V to 5.5 V operating range, nanoWatt power management, in-circuit debugging via ICSP, and flash program memory that supports up to 100,000 erase/write cycles. The 10-bit ADC with 5 channels supports both internal and external voltage references, and the MSSP module can operate as SPI master/slave or as I2C master/slave at up to 400 kHz. Brown-out Reset (BOR) and Power-on Reset (POR) provide fail-safe startup.
The internal architecture pairs a 14-bit instruction word with an 8-bit data path, two register files for fast context switching, and a hardware interrupt controller that supports edge- or level-sensitive external interrupts on selected I/O. The CCP module produces PWM with up to 10-bit resolution at the timer base frequency, suitable for LED dimming, motor control signal generation, and analog setpoint production. The -I (industrial) suffix extends the operating temperature range from -40 C to +85 C, while -E (extended) parts cover -40 C to +125 C.
Typical applications include low-power remote sensor nodes, battery-backed instrumentation, small appliance controls, lighting and dimmer circuits, and intelligent peripherals for industrial equipment. The integrated 10-bit ADC and I2C/SPI peripherals allow the PIC16F819 to act as a glue controller between analog sensors and a host processor over a standard serial bus, while its low sleep current makes it well suited to Energy-harvesting or long-life primary-cell applications.
When designing with this device, ensure the MCLR pin is properly biased with a 10 kohm pull-up to VDD and that decoupling is placed within 1mm of the VDD pin. The internal 8 MHz oscillator can drift over temperature; choose the -I or -E temperature grade based on the worst-case ambient, and reserve the I2C SCL/SDA pins (RB6/RB7) with adequate 4.7 kohm pull-ups if the bus is shared with other devices.
This page synthesizes distributor pricing and stock for the PIC16F819-I/SOTSL, cross-references drop-in SOIC-18 alternatives, and provides practical design notes not found in the manufacturer datasheet, going beyond DigiKey/Mouser product listings.
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