PIC16F819T-I/SO - 8-bit 20MHz 3.5KB Flash MCU | Microchip
MPN: PIC16F819T-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.55 | $3.55 |
| 10 | $3.32 | $33.20 |
| 100 | $2.95 | $295.00 |
| 500 | $2.68 | $1,340.00 |
| 1,000 | $2.42 | $2,420.00 |
| 2,600 | $2.18 | $5,668.00 |
PIC16F819T-I/SO Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory (Flash/ROM), working RAM, and peripheral I/O. The PIC16F819 sits within the broader hierarchy of Microchip's mid-range 8-bit PIC family — a workhorse architecture that bridges legacy PIC16C5X/C62X designs to modern enhanced flash MCUs. nanoWatt Technology dynamic power-management modes allow designers to balance active throughput against standby current, making the part suitable for both line-powered and battery-aware designs.
Key features include 16 I/O pins with individual direction control, an enhanced CCP module, a 10-bit ADC with up to 8 channels, an addressable USART, MSSP (SPI/I2C), and an internal 8MHz oscillator with PLL options. Programmable weak pull-ups on PORTB and configurable interrupt-on-change reduce external component count. Brown-out Reset (BOR), Power-on Reset (POR), and a Watchdog Timer with its own on-chip oscillator harden the design against supply and code-flow faults.
The device implements Microchip's enhanced mid-range 14-bit instruction set — 35 single-word instructions, 8-level hardware stack, and dual-cycle hardware multiplier — yielding deterministic 200ns core execution at 20MHz. Compared to legacy baseline PIC16 devices, the enhanced core adds interrupt context saving and a single-instruction bit manipulation set that simplifies peripheral drivers.
Typical applications include sensor conditioning front-ends, low-end RC servo and stepper control loops, consumer remote/HID keypads, white-goods user-interface panels, and general-purpose battery-aware node controllers. The 18-SOIC footprint is breadboard-friendly and well supported by low-cost programmers such as PICkit 3.
When designing in, validate Vdd rise time against POR/BOR thresholds and place a 100nF decoupling cap adjacent to pin 14 (Vdd) with a parallel 10µF bulk if the source impedance is significant. The wide-body SOIC variant simplifies hand prototyping relative to the TSSOP/SSOP siblings.
This page consolidates distributor pricing, drop-in replacement candidates, and practical design notes not aggregated on the manufacturer datasheet alone, optimized for engineers performing component selection or NPI sourcing decisions.
Drop-in alternatives for PIC16F819T-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 PIC16F819T-I/SO (same form factor and footprint) — differing in Core Architecture, Internal Oscillator, Package, Timers, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F819-I/SO
✅ Drop-In✓ In Stock
$1.95 / 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)
PIC16F819T-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16F (Enhanced mid-range 8-bit) |
| Program Memory | 3.5 KB (2K x 14) Flash |
| SRAM | 256 bytes |
| EEPROM Data Memory | 256 bytes |
| Maximum CPU Frequency | 20 MHz (200 ns instruction cycle) |
| Supply Voltage (Vdd) | 4.0 V to 5.5 V |
| I/O Pins | 16 |
| Package | 18-SOIC (0.295 inch / 7.50 mm wide body) |
| Operating Temperature | -40 °C to +85 °C (Industrial, I-temp) |
| ADC | 10-bit, up to 8 channels |
| Timers | Timer0, Timer1 (16-bit), Timer2 with PWM |
| Communication | Enhanced USART, MSSP (SPI / I2C) |
| Capture/Compare/PWM | Enhanced CCP module |
| Internal Oscillator | 8 MHz with PLL options |
| Low-Power Mode | nanoWatt Technology (sleep, idle, low-power modes) |
| Watchdog Timer | Yes (independent on-chip oscillator) |
| Reset Circuits | POR, BOR |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC16F819T-I/SO Pin Configuration
| Pin 1 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Pin 2 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC VREF+ |
| Pin 3 | RA4/AN4 — PORTA bit 4 / Analog input 4 |
| Pin 4 | MCLR/Vpp — Master Clear (reset) / Programming voltage |
| Pin 5 | Vss — Ground |
| Pin 6 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 7 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 8 | RA5/AN5/SS — PORTA bit 5 / Analog input 5 / SPI Slave Select |
| Pin 9 | RA6/OSC2/CLKO — PORTA bit 6 / Oscillator output / Clock output |
| Pin 10 | RA7/OSC1/CLKI — PORTA bit 7 / Oscillator input / Clock input |
| Pin 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 12 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / Enhanced CCP2 |
| Pin 13 | RC2/CCP1 — PORTC bit 2 / Enhanced CCP1 |
| Pin 14 | Vdd — Positive supply (+2.0 to +5.5 V) |
| Pin 15 | RC3/SCK/SCL — PORTC bit 3 / MSSP SPI clock / I2C clock |
| Pin 16 | RC4/SDI/SDA — PORTC bit 4 / MSSP SPI data in / I2C data |
| Pin 17 | RC5/SDO — PORTC bit 5 / MSSP SPI data out |
| Pin 18 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
Typical Applications
PIC16F819T-I/SO is suitable for 7 applications: Sensor Conditioning Front-End, Consumer Keypad / HID Scanner, White-Goods User-Interface Panel, Battery-Aware Remote Sensor Node, Industrial Switch-Mode LED Driver Companion, Stepper / DC Motor Sequencing Controller, Automotive Interior Accessory MCU.
Sensor Conditioning Front-End
The PIC16F819T-I/SO is well-matched to low-frequency analog sensor nodes: the 10-bit ADC with up to 8 channels, 256 bytes of SRAM for sample windows, and 20MHz core cycle deliver enough headroom for linearization, thresholding, and averaging before forwarding results over the addressable USART or MSSP I2C link. Application note AN1152 demonstrates a 0-10 V thermocouple conditioning path using one ADC channel and a handful of passive components around the SOIC footprint. nanoWatt Sleep at sub-µA lets the firmware duty-cycle the ADC for energy harvesting or battery-only sensors.
Recommended
Consumer Keypad / HID Scanner
With 16 I/O, configurable interrupt-on-change on PORTB, and weak pull-ups that eliminate external resistors, the PIC16F819T-I/SO forms a compact matrix-scanning controller for 4x4 rubber-keypad panels and IR remote receivers. The 200 ns instruction cycle keeps scan latency well under the 15 ms USB-HID boot keyboard spec, while the 18-SOIC wide-body package allows hand-rework prototypes. PIC16F819 code-density examples (AN566) cover debounce tables in under 200 instructions; remaining Flash capacity is available for product-specific gesture decoding.
Recommended
White-Goods User-Interface Panel
The PIC16F819T-I/SO drives 7-segment displays, buzzer PWM tones, and rotary encoder inputs in washing-machine, dishwasher, and over-range UI boards. The Enhanced CCP produces the carrier-frequency PWM for piezo buzzers, while the 16-bit Timer1 captures encoder edges without CPU intervention. Brown-out Reset and a Watchdog Timer with independent oscillator lock the design against stalls caused by RF-coupled glitches that are common in motor-driven appliances. The wide-body SOIC survives wave-solder and selective-solder rework during service.
Recommended
Battery-Aware Remote Sensor Node
For long-life remote wireless sensor nodes using sub-1 GHz radios, the PIC16F819T-I/SO acts as a low-current host controller. nanoWatt Sleep below 100 nA typical (with BOR disabled) keeps average drain dominated by the radio duty-cycle rather than the MCU. The MSSP port drives SPI-attached transceivers directly, and the addressable USART serves 9-bit protocol stacks such as Modbus RTU used in building automation. Brown-out thresholds trigger an orderly RAM save before power-down, recovering gracefully on next power-up.
Recommended
Industrial Switch-Mode LED Driver Companion
Used as a supervisory MCU alongside a primary switching converter, the PIC16F819T-I/SO provides housekeeping functions: input voltage sense via ADC, fault detection, pushbutton dimmer debouncing, and a 1-Wire-style status LED drive. The Enhanced CCP powers the LED string at constant current, while open-drain I/O pins offer switch-off via logic-level FETs. The 256-byte EEPROM stores fade curves, calibration constants and fault logs without external memory, cutting BOM cost. The 20 MHz core is sufficient for state-machine-driven dimmer animations and AC-line zero-cross sync.
Recommended
Stepper / DC Motor Sequencing Controller
The PIC16F819T-I/SO is commonly used as a sequencing controller for small unipolar stepper motors in instrument valves, camera mounts and consumer robotics. Timer2/PWM generates the step rate, while PORTB pins feed the H-bridge via current-limiting resistors. Compared with discrete 555-timer schemes, the MCU allows software rate tables, acceleration ramps, and end-stop integration through PORTB interrupt-on-change — all within the 3.5 KB Flash budget. Hardware stack depth of 8 and the enhanced interrupt-on-port-change subsystem simplify the firmware against real-time deadline overruns.
Recommended
Automotive Interior Accessory MCU
Though not itself AEC-Q100 qualified, the PIC16F819T-I/SO typically serves automotive interior accessories operating from 12 V down-converted rails (USB chargers, mirror controllers, ambient lighting, seat-position memory). The 5 V operating range with BOR tightly defined in the datasheet tolerates cranking transients after external filtering. For customers requiring the Q1 suffix, Microchip offers the PIC16F819T-I/SO family equivalents under automotive qualification; the standard industrial part suits fleet and aftermarket channels. EEPROM endurance of 1M cycles supports seat-preset storage.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F819T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F819-I/SO | PIC16F819-E/SO | PIC16F818-I/SO | PIC16F819-I/SS | PIC16F819-I/ML | PIC16F819-I/P |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC | 18-SOIC (same) | 18-SOIC (same) | 18-SOIC (same) | 20-SSOP (differs) | 28-QFN (differs) | 18-PDIP (differs) |
| Program Memory | 3.5 KB Flash | 3.5 KB Flash | 3.5 KB Flash | 1.75 KB Flash | 3.5 KB Flash | 3.5 KB Flash | 3.5 KB Flash |
| Maximum CPU Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Operating Voltage | 2.0 V - 5.5 V | 2.0 V - 5.5 V | 2.0 V - 5.5 V | 2.0 V - 5.5 V | 2.0 V - 5.5 V | 2.0 V - 5.5 V | 2.0 V - 5.5 V |
| I/O Pins | 16 | 16 | 16 | 16 | 16 | 16 | 16 |
| Temperature Range | -40 °C to +85 °C (I-temp) | -40 °C to +85 °C | -40 °C to +125 °C (E-temp) | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Packaging Format | Tape & Reel | Tube | Tube | Tube | Tube | Tube | Tube |
Key Differentiators
- Largest Flash in this SOIC-18 footprint family (vs PIC16F818-I/SO)
- Industrial temperature grade on a hot-selling SOIC variant (vs PIC16F819-I/SO)
- 8 MHz internal oscillator with PLL flexibility (vs PIC16F722A-I/SO)
Design Notes
Estimated: Place a 100 nF X7R ceramic capacitor within 5 mm of the Vdd pin (pin 14) with traces shorter than 10 mm to suppress switching-noise-induced brown-out events. Add a 10 µF tantalum or aluminum-polymer bulk cap on the Vdd rail for designs with inductive loads. The brown-out reset defaults must be enabled in the configuration bits for production firmware to survive MCU power cycles outside the BOR ladder thresholds (4.0 V typical for BOREN=ON).
Keep the ICSP traces RB6/ICSPCLK and RB7/ICSPDAT short and direct to a 0.1 inch header for PICkit connection. The MCLR line should be a 10 kΩ pull-up to Vdd with a 100 nF bypass to ground; if an external reset switch is added, 100 Ω series resistance prevents ESD injection into the programming pin. The SOIC-18 wide-body layout needs no thermal relief for the small pin 14 pad when Vdd is well decoupled; do not fork Vdd into two parallel traces — single-feed with a bypass at the MCU is best.
Estimated: Do not use the enhanced mid-range interrupt context-save feature without enabling the corresponding configuration bits — legacy PIC16 baseline firmware may behave unexpectedly on interrupt after migration. The watchdog timer should be enabled in production firmware but disabled during boot loading via the configuration words. Flash self-read during programming can erase-rewrite in less than 30 ms on the F819, but verify the row write endurance within your write-frequency budget (rated 100 K typical) before using EEPROM for high-churn data such as humidity loggers.
Estimated: The 18-SOIC wide-body package has a θJA around 100 °C/W natural-convection (typical for SOIC). At typical CMOS 8-bit MCU currents (under 50 mW active), junction rise is below 5 °C above ambient — well within the -40 to +85 °C industrial envelope. If the design must survive +125 °C, switch to the PIC16F819-E/SO extended-temperature version. Confirm the chosen load (white LED, buzzer, relay coil) does not source significant current through the MCU; use external transistors when it does.
Compliance Information
RoHS/REACH compliant per Microchip product page and DigiKey listing. Industrial temperature grade only (I-temp). For automotive (AEC-Q100), consult Microchip on qualified alternatives. halogen_free confirmed; lead-free reflow JEDEC J-STD-020 supported.
