PIC16F819-I/SS - 3.5KB Flash 8-bit MCU, SSOP-20 | Microchip
MPN: PIC16F819-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.51 | $3.51 |
| 10 | $3.16 | $31.60 |
| 100 | $2.81 | $281.00 |
| 500 | $2.46 | $1,230.00 |
| 1,000 | $2.11 | $2,110.00 |
PIC16F819-I/SS Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, non-volatile program memory, working RAM, and peripherals such as ADC, timers, and communication interfaces. PIC microcontrollers use Microchip's proprietary Harvard RISC architecture and dominate 8-bit embedded applications due to their deterministic interrupt latency, low power consumption (via nanoWatt Technology), and a 35-instruction instruction set that simplifies code generation. Within the broader taxonomy, the PIC16F819 falls under 8-bit microcontrollers -> microcontrollers -> integrated circuits -> semiconductors.
Key features of the PIC16F819-I/SS include: an 8 MHz internal oscillator (software-tunable), 5 channels of 10-bit Analog-to-Digital conversion, one Capture/Compare/PWM module, a Synchronous Serial Port configurable as SPI or I2C, and nanoWatt power management with multiple sleep modes and ultra-low-power wake-up sources. The SSOP-20 package offers a compact footprint (5.30 mm body width) suited for space-constrained designs while maintaining through-hole-like assembly tolerance.
Technically, the PIC16F819-I/SS uses a modified Harvard architecture with separate program and data paths to enable single-cycle instruction fetch alongside two-cycle data access. The 14-bit instruction word provides uniform opcodes for arithmetic, bit manipulation, and peripheral control. Integrated brown-out reset (BOR), power-on reset (POR), and a watchdog timer with its own on-chip RC oscillator enhance reliability in unattended or remote installations. The device operates from 2.0 V to 5.5 V (F-version, with the I/SS suffix specifying 4.0 V to 5.5 V across -40C to +85C).
Typical applications include battery-powered sensor nodes, low-cost industrial controls, LED lighting controllers, and consumer appliance front panels. The combination of EEPROM, ADC, and PWM in a single 20-pin device is well suited to closed-loop fan control, thermostat read-out, and small motor speed regulation. For designers already familiar with PIC16 mid-range devices, the PIC16F819 is firmware-compatible with the PIC16F818 except for the additional program memory (3.5 KB vs 1.7 KB).
A key design consideration: the SSOP-20 footprint is a fine-pitch surface-mount package (0.65 mm pitch). Reflow profile must stay within JEDEC J-STD-020 limits, and PCB land pattern recommendations from Microchip IPC-7351 should be observed. For users migrating from PIC16F818 designs, the additional 1.75 KB of Flash is transparent to existing code if the linker is configured for the larger memory map.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC16F819-I/SS — 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/SS (same form factor and footprint) — differing in Package, I/O Pins, Timers, ADC, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F818-I/SS
✅ Drop-In✓ In Stock
$1.92 / Unit
View Datasheet →PIC16F819-E/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F785-I/SS
✅ Drop-In✓ In Stock
$1.59 / Unit
View Datasheet →PIC16F767-I/SS
✅ Drop-In✓ In Stock
$2.18 / Unit
View Datasheet →PIC16F876A-I/SS
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16F819-I/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16 8-bit RISC (Harvard) |
| Program Memory (Flash) | 3.5 KB (2K x 14) |
| Data EEPROM | 256 bytes |
| Data RAM | 256 bytes |
| Maximum CPU Speed | 20 MHz (5 MIPS, 200 ns instruction cycle) |
| Internal Oscillator | 8 MHz (software selectable) |
| Supply Voltage (VDD) | 4.0 V to 5.5 V (I/SS industrial grade) |
| I/O Pins | 16 |
| ADC | 5 channels, 10-bit resolution |
| Timers | Timer0, Timer1, Timer2 (3 / 1 16-bit) |
| CCP Modules | 1 (Capture/Compare/PWM) |
| Serial Interfaces | 1x SSP (configurable as SPI or I2C) |
| Operating Temperature | -40C to +85C (industrial) |
| Package | 20-pin SSOP (5.30 mm / 0.209") |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited floor life at <30C/85% RH) |
| RoHS Status | Compliant |
| Instruction Set | 35 single-word instructions |
| Power-Saving Modes | nanoWatt Technology (multiple sleep modes) |
PIC16F819-I/SS Pin Configuration
| Pin 1 | RA2/AN2/VREF- — GPIO RA2 / ADC AN2 / VREF negative reference |
| Pin 2 | RA3/AN3/VREF+ — GPIO RA3 / ADC AN3 / VREF positive reference |
| Pin 3 | RA4/AN4 — GPIO RA4 / ADC AN4 (open-drain) |
| Pin 4 | RA5/MCLR/VPP — GPIO RA5 / Master Clear reset (active low) / Programming voltage |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — GPIO RB0 / External interrupt |
| Pin 7 | RB1 — GPIO RB1 |
| Pin 8 | RB2 — GPIO RB2 |
| Pin 9 | RB3/PGM — GPIO RB3 / Low-voltage programming entry |
| Pin 10 | RB4 — GPIO RB4 |
| Pin 11 | RB5 — GPIO RB5 |
| Pin 12 | RB6/ICSPCLK — GPIO RB6 / ICSP clock |
| Pin 13 | RB7/ICSPDAT — GPIO RB7 / ICSP data |
| Pin 14 | VDD — Positive supply voltage |
| Pin 15 | RA6/OSC2/CLKOUT — GPIO RA6 / Crystal output / Clock output |
| Pin 16 | RA7/OSC1/CLKIN — GPIO RA7 / Crystal input / External clock input |
| Pin 17 | RA0/AN0 — GPIO RA0 / ADC AN0 |
| Pin 18 | RA1/AN1 — GPIO RA1 / ADC AN1 |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage |
Typical Applications
PIC16F819-I/SS is suitable for 6 applications: Battery-Powered Sensor Nodes, Closed-Loop Fan Speed Control, Industrial Thermostat Read-Out, LED Lighting Color Controller, Consumer Appliance Front Panels, Small DC Motor Speed Regulator.
Battery-Powered Sensor Nodes
The PIC16F819-I/SS is well-suited to battery-powered sensor nodes because its nanoWatt Technology offers multiple low-power sleep modes that drop quiescent current to the microampere range while still allowing wake-up via timer or external interrupt. With 5 channels of 10-bit ADC, multiple analog sensors (temperature, light, battery voltage) can be sampled without external multiplexer, and the 256 bytes of EEPROM allow periodic calibration data to persist across power cycles. The 8 MHz internal oscillator removes the need for an external crystal, reducing BOM cost and standby drain. Engineers typically run the PIC16F819 at 1 MHz internal CPU clock during sensing and duty-cycle into sleep between readings, achieving multi-year battery life on two AA cells.
Recommended
Closed-Loop Fan Speed Control
In closed-loop fan speed control the PIC16F819-I/SS reads tachometer pulses from the fan on an I/O pin, computes an error against a target RPM setpoint, and drives a PWM output through its CCP module to vary the fan supply voltage. The 10-bit ADC allows precise thermistor-based temperature feedback, and the 256 bytes of EEPROM permit storing calibrated PWM-vs-RPM curves across temperature. Operating from 5 V (matching typical fan supplies) the device requires only the MCU, a sense resistor, and a MOSFET driver. The 20-MIPS throughput guarantees sub-millisecond control loop updates even when the firmware is performing UART diagnostics in parallel.
Recommended
Industrial Thermostat Read-Out
The PIC16F819-I/SS is well-matched to industrial thermostat read-out applications because its 5-channel 10-bit ADC and SPI/I2C serial port can drive multiple thermistor bridges or a digital temperature sensor such as the MCP9808 simultaneously. The 256 bytes of EEPROM provide non-volatile storage for setpoint and hysteresis parameters that survive power loss, while the 35-instruction PIC16 instruction set keeps firmware development fast for engineers familiar with the mid-range PIC family. Industrial -40C to +85C temperature rating ensures deployment in unheated control panels, and the SSOP-20 footprint supports compact PCB layouts inside wall-mounted thermostat enclosures.
Recommended
LED Lighting Color Controller
The PIC16F819-I/SS drives RGB or warm-white LED strings by generating three software PWM channels on its CCP and timer peripherals, with software-based color-temperature or hue curves stored in EEPROM for instant recall at power-on. The 8 MHz internal oscillator combined with timer-based PWM delivers flicker-free dimming down to 1 percent duty cycle, and the ADC can monitor feedback from an ambient light sensor for daylight-harvesting closed-loop control. Low-cost LED bulbs benefit especially from the SSOP-20 surface-mount package, which enables fully automated assembly at high volumes. The MCU's nanoWatt sleep modes ensure standby power consumption stays well below 0.5 W per bulb.
Recommended
Consumer Appliance Front Panels
In consumer appliance front panels the PIC16F819-I/SS scans a 4x4 keypad matrix via its 16 I/O pins, drives a character LCD over SPI using its SSP peripheral, and reads user-set parameters through the ADC channels. The PIC16F819-I/SS industrial temperature range and on-chip EEPROM simplify design for white-goods manufacturers that need to survive kitchen or laundry-room environments without external memory chips. Its 200 ns instruction execution produces imperceptible button-debounce and display-update latency, while the SSOP-20 package enables compact user-interface PCBs that fit behind narrow bezel cutouts. Firmware updates are easily performed via ICSP during manufacturing.
Recommended
Small DC Motor Speed Regulator
The PIC16F819-I/SS regulates small DC motor speed by driving a single MOSFET half-bridge from its CCP PWM output while measuring back-EMF or tachometer feedback on the ADC channel. With 256 bytes of EEPROM it can store load-compensation curves learned over multiple operating sessions, and the SSP (SPI/I2C) interface allows the addition of an external MCP4725 or quadrature encoder for higher-end designs. The 20 MHz instruction throughput is more than sufficient for field-oriented control loops on sub-100 W brushed or brushless DC motors. The SSOP-20 footprint and 4.0 V to 5.5 V supply range align with hobby servos, robotics pumps, and small appliance drives.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F819-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F818-I/SS | PIC16F819-E/SS | PIC16F785-I/SS | PIC16F767-I/SS | PIC16F876A-I/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SSOP-20 | SSOP-20 - same | SSOP-20 - same | SSOP-20 - same | SSOP-20 - same | SSOP-20 - same |
| Program Memory (Flash) | 3.5 KB | 1.75 KB | 3.5 KB | 3.5 KB | 8 KB | 14 KB |
| Data EEPROM | 256 bytes | 128 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Maximum CPU Speed | 20 MHz (5 MIPS) | 20 MHz (5 MIPS) | 20 MHz (5 MIPS) | 20 MHz (5 MIPS) | 20 MHz (5 MIPS) | 20 MHz (5 MIPS) |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +125C | -40C to +85C | -40C to +85C | -40C to +85C |
| ADC Channels | 5 x 10-bit | 5 x 10-bit | 5 x 10-bit | 5 x 10-bit + 2 comparators | 8 x 10-bit | 5 x 10-bit |
| CCP/PWM Channels | 1 | 1 | 1 | 1 | 2 | 2 |
| Serial Interfaces | SSP (SPI or I2C) | SSP (SPI or I2C) | SSP (SPI or I2C) | SSP (SPI or I2C) | MSSP + AUSART | MSSP + AUSART |
Key Differentiators
- Largest Flash in its pin-compatible family (vs PIC16F818-I/SS)
- Industrial temperature as standard (vs PIC16F819-I/SOTSL)
- More analog channels than PIC16F767 (vs PIC16F767-I/SS)
Design Notes
The PIC16F819-I/SS SSOP-20 footprint has a 0.65 mm pin pitch, requiring careful PCB land pattern design per IPC-7351 nominal. Stencil aperture should be 1:1 with the land pad, and a reflow profile following JEDEC J-STD-020 is mandatory. Keep analog traces (RA0-RA3, RA5) short and away from switching nodes such as the PWM CCP output and digital I/O carrying high-frequency SPI/I2C signals to minimize ADC sampling noise.
Place a 100 nF decoupling capacitor within 3 mm of the VDD pin (pin 20) and a bulk 10 uF tantalum or ceramic capacitor at the board power entry. The MCLR/VPP pin (pin 4) should be tied to VDD through a 10 kohm pull-up resistor; if in-circuit programming is used, add the standard 10 kohm/470 ohm series-resistor network per Microchip ICSP recommendations. The dual VDD/VSS pins (14/19 and 5/20) must both be connected to maintain ADC reference accuracy and reduce digital switching noise on the analog supply.
When migrating firmware from PIC16F818 to PIC16F819 the linker must be reconfigured for 2K program-word Flash versus 1K. Configuration bits (CONFIG1, CONFIG2) must be reviewed, as PIC16F819 disables the LDO_EN bit in some revisions per errata DS80233. Watchdog timer postscaler selection should be reviewed against the chosen oscillator - using the internal 31 kHz LFINTOSC as WDT source prevents crystal-startup lockout during long firmware runs.
Compliance Information
RoHS and lead-free per Microchip PIC16F819 product page. Halogen-free status confirmed by Microchip material declaration. Not AEC-Q100 qualified - select automotive-grade PIC16F819-E/SS or use PIC16F819 with external qualification for automotive projects.
