PIC16F819-I/SO - 8-bit 20MHz 3.5KB Flash MCU | Microchip
MPN: PIC16F819-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.1 | $3.10 |
| 10 | $2.78 | $27.80 |
| 100 | $2.47 | $247.00 |
| 500 | $2.21 | $1,105.00 |
| 1,000 | $1.95 | $1,950.00 |
PIC16F819-I/SO Overview
A microcontroller is a single-chip computer that integrates a CPU core, program memory (Flash/ROM), working RAM, peripheral interfaces (ADC, timers, communication ports), and general-purpose I/O into one package. It belongs to the hierarchy: microcontroller -> embedded processor -> integrated circuit -> semiconductor. The PIC16F819-I/M8 line is part of Microchip's mid-range "PIC16F" family that emphasizes low power (nanoWatt technology), compact code footprint (35 single-word instructions), and upward compatibility with the older PIC16C7x/PIC16C62xA/PIC16C5X/PIC12CXXX devices, allowing code reuse across product generations.
Key features include 4V to 5.5V single-supply operation, an internal 8MHz oscillator (selectable via configuration fuses), 10-bit ADC with 5 channels, a hardware USART, a 16-bit timer/counter, and nanoWatt power management that drops supply current below 1uA in sleep mode. The device offers in-circuit serial programming (ICSP) and in-circuit debugger support via the standard ICD header.
Architecturally, the PIC16F819 uses a Harvard RISC core with separate program and data buses, 14-bit wide instruction words, and a hardware stack that simplifies C and assembly development. The Flash program memory supports 100K erase/write cycles typical and >40 years data retention per Microchip's published endurance specifications.
Typical applications include low-power sensor and edge-processing displays for embedded industrial IoT nodes, low-end sensor interfaces, and handheld consumer products. The integrated ADC and PWM simplify sensor signal conditioning and motor/LED control loops.
When designing with this device, place a 100nF decoupling capacitor within 5mm of VDD and a 10uF bulk capacitor near the IC. Reserve the MCLR pin with a 10kohm pull-up to VDD to avoid spurious resets, and ensure ICP/ICSP header access for field firmware updates.
Drop-in alternatives for PIC16F819-I/SO — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC16F819-I/SO (same form factor and footprint) — differing in Package, Timers, Internal Oscillator, Operating Temperature, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F819-I/PTSL
✅ Drop-In✓ In Stock
$1.78 / Unit
View Datasheet →PIC16F819-I/ML
✅ Drop-In✓ In Stock
$2.05 / Unit
View Datasheet →PIC16F819-E/SO
✅ Drop-In✓ In Stock
$2.2 / Unit
View Datasheet →PIC16F818-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F88-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F819-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16 (8-bit RISC, 14-bit instruction) |
| Program Memory (Flash) | 3.5 KB (2K x 14 words) |
| Data SRAM | 256 bytes |
| Data EEPROM | 256 bytes |
| Maximum CPU Frequency | 20 MHz (200 ns instruction cycle) |
| Supply Voltage (VDD) | 4 V to 5.5 V |
| Internal Oscillator | 8 MHz |
| Digital I/O Pins | 16 |
| Analog-to-Digital Converter | 10-bit, 5 channels |
| Timers | 1 x 8-bit, 1 x 16-bit |
| Capture/Compare/PWM Modules | 1 |
| Serial Interfaces | 1x SSP (SPI or I2C), USART |
| Package | 18-pin SOIC (SO, 0.300 in) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (industrial) |
| Instruction Set | 35 single-word instructions |
| In-Circuit Programming | ICSP / ICD supported |
| RoHS Status | Compliant |
PIC16F819-I/SO Pin Configuration
| Pin 1 | RA2/AN2 — Port A bit 2 / Analog input channel 2 |
| Pin 2 | RA3/AN3/VREF+ — Port A bit 3 / Analog input 3 / Positive voltage reference |
| Pin 3 | RA4/AN4/T0CKI — Port A bit 4 / Analog input 4 / Timer0 clock input |
| Pin 4 | RA5/MCLR/VPP — Port A bit 5 / Master Clear (reset) / Programming voltage |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — Port B bit 0 / External interrupt |
| Pin 7 | RB1 — Port B bit 1 |
| Pin 8 | RB2 — Port B bit 2 |
| Pin 9 | RB3/PGM — Port B bit 3 / Low-voltage ICSP clock |
| Pin 10 | RB4 — Port B bit 4 |
| Pin 11 | RB5 — Port B bit 5 |
| Pin 12 | RB6/PGC — Port B bit 6 / ICSP serial clock |
| Pin 13 | RB7/PGD — Port B bit 7 / ICSP serial data |
| Pin 14 | VDD — Positive supply voltage (4V to 5.5V) |
| Pin 15 | OSC2/CLKOUT — Crystal oscillator output / clock output |
| Pin 16 | OSC1/CLKIN — Crystal oscillator input / external clock input |
| Pin 17 | RA0/AN0 — Port A bit 0 / Analog input channel 0 |
| Pin 18 | RA1/AN1 — Port A bit 1 / Analog input channel 1 |
Typical Applications
PIC16F819-I/SO is suitable for 6 applications: Industrial Sensor Interface Node, Consumer Appliance Control Board, LED Lighting Controller, Battery-Powered Remote / IoT Edge Device, Automotive Body / Interior Subsystem, Educational / Hobbyist MCU Platform.
Industrial Sensor Interface Node
The PIC16F819-I/SO suits low-cost sensor interfaces because its 10-bit 5-channel ADC and 16 digital I/O let it read multiple analog sensors and drive digital loads in a single chip. Per Microchip datasheet DS39631F, its 4V to 5.5V supply, 20 MHz CPU, and nanoWatt sleep mode below 1 uA fit battery or 24V-bus-powered industrial nodes. Place a 100nF decoupling cap within 5mm of VDD; the internal 8 MHz oscillator removes the need for a crystal in cost-sensitive sensor modules, and ICSP supports in-field firmware updates without removing the MCU from the PCB.
Recommended
Consumer Appliance Control Board
The PIC16F819-I/SO drives small appliance controls via its 1 CCP/PWM module, 16 digital I/O, and integrated USART for keypad/display interfaces. Per Microchip datasheet DS39631F, its 35 single-word instructions and 14-bit instruction width simplify assembly and C code development, while the 3.5 KB Flash is sized for typical appliance state-machine firmware. The -40C to +85C industrial temperature grade covers laundry, kitchen, and HVAC control environments, and the 18-pin SOIC package is friendly to single-layer consumer PCBs.
Recommended
LED Lighting Controller
The PIC16F819-I/SO drives LED dimming and color-mixing loops via its 10-bit ADC (for current/voltage sensing) and 1 CCP/PWM module, which produces stable PWM for LED current control. Per Microchip datasheet DS39631F, the 20 MHz instruction throughput and 14-bit PWM resolution support smooth dimming curves and color-temperature transitions. The internal 8 MHz oscillator eliminates external timing components in compact lighting PCBs, while the 16 I/O handle multiple LED channels and a DMX-style serial control interface.
Recommended
Battery-Powered Remote / IoT Edge Device
The PIC16F819-I/SO is a strong fit for battery-powered IoT edge nodes because its nanoWatt sleep mode drops current below 1 uA and the internal 8 MHz oscillator removes a crystal. Per Microchip datasheet DS39631F, the 256-byte EEPROM stores configuration and calibration data without external NVRAM, and the integrated USART and SSP (SPI/I2C) interface support short-range wireless modules such as Sub-GHz or BLE transceivers. Its 3.5 KB Flash is sufficient for sensor-fusion firmware in resource-constrained edge nodes.
Recommended
Automotive Body / Interior Subsystem
Although not AEC-Q100 qualified, the PIC16F819-E/SO variant supports the -40 to +125C extended temperature range suitable for non-safety automotive interior modules. Per Microchip datasheet DS39631F, its 4V to 5.5V supply tolerates nominal 5V automotive rails, and the integrated ADC/PWM handle LED drivers, simple motor controls, and switch-matrix scanning in door modules, seat controllers, and HVAC panels. Confirm AEC-Q100 requirements with the system safety plan before selecting for safety-critical subsystems.
Recommended
Educational / Hobbyist MCU Platform
The PIC16F819-I/SO is widely used as a teaching platform because the 35-instruction PIC16 mid-range instruction set is approachable, and ICSP/ICD support means beginners can program and debug the chip on a breadboard with a PICkit 3/4. Per Microchip datasheet DS39631F, the 3.5 KB Flash and 256-byte SRAM run code, hobbyist projects, and MPLAB X sample code without external memory. Its widespread distributor availability and low unit price make it a common starting point for educational and maker MCU projects.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F819-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F819-I/P | PIC16F819-I/ML | PIC16F819-E/SO | PIC16F818-I/SO | PIC16F88-I/SO |
|---|---|---|---|---|---|---|
| Package | SOIC-18 (SO, 0.300 in) | DIP-18 (different footprint) | QFN-28 (different footprint) | SOIC-18 (same) | SOIC-18 (same) | SOIC-18 (same) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 3.5 KB (2K x 14) | 3.5 KB | 3.5 KB | 3.5 KB | 1.75 KB | 7 KB |
| Data EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 0 bytes | 256 bytes |
| Data SRAM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 128 bytes | 368 bytes |
| Maximum CPU Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| ADC Resolution / Channels | 10-bit / 5 channels | 10-bit / 5 channels | 10-bit / 5 channels | 10-bit / 5 channels | 10-bit / 5 channels | 10-bit / 7 channels |
| Internal Oscillator | 8 MHz | 8 MHz | 8 MHz | 8 MHz | None | 8 MHz |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C | -40C to +85C | -40C to +125C (extended) | -40C to +85C | -40C to +85C |
Key Differentiators
- On-chip 256-byte data EEPROM absent in PIC16F818 (vs PIC16F818-I/SO)
- Internal 8 MHz oscillator eliminates external crystal (vs PIC16F818-I/SO)
- Extended-temperature grade variant available (vs PIC16F819-I/P (DIP-18))
- Compact Flash footprint vs PIC16F88 (vs PIC16F88-I/SO)
Design Notes
Place a 100nF ceramic decoupling capacitor within 5mm of the VDD pin (pin 14) and a 10uF bulk capacitor near the IC. The PIC16F819 operates from 4V to 5.5V; for designs needing 3.3V rails use an LDO such as MCP1700 between the supply and VDD. Estimated: at 20 MHz with all peripherals active, ICC is typically 11 mA, so an MCP1700-3302 (250 mA LDO) provides >20x headroom.
Always pull MCLR (pin 5, RA5/MCLR/VPP) high with a 10kohm resistor to VDD; floating MCLR causes spurious resets and prevents reliable ICSP programming. For ICSP, reserve the PGC (RB6) and PGD (RB7) pins to the ICSP header without series resistors; in-circuit capacitors on RB6/RB7 interfere with programming. The internal 8 MHz oscillator is factory-trimmed but software calibration can tighten accuracy further for UART timing.
At 5V VDD and 20 MHz, the PIC16F819-I/SO dissipates well under 100 mW, so the SOIC-18 package requires no special thermal management. Ensure ambient temperature stays within -40C to +85C for the industrial (-I) grade; for elevated-temperature applications such as automotive interior modules, choose the PIC16F819-E/SO extended-temperature variant rated to +125C. Estimated: junction-to-ambient thermal resistance for SOIC-18 is approximately 85 C/W, so at 50 mW dissipation the junction rises ~4C above ambient.
Keep the crystal or resonator traces between OSC1 (pin 16) and OSC2 (pin 15) short and surround them with a ground pour to reduce EMI. When using the internal 8 MHz oscillator, leave OSC1/OSC2 as standard GPIO (RA7/RB0 on larger variants) or tie OSC1 to ground through a 1Mohm resistor to minimize leakage. For ADC accuracy, route analog traces (AN0 to AN4) away from digital switching signals and add a small RC filter at AVDD when present.
Compliance Information
RoHS and REACH compliant per Microchip product page. Standard -I industrial grade (-40C to +85C); AEC-Q100 not qualified - choose PIC16F819-E/SO (-40C to +125C extended) for non-safety automotive interior modules only.
