PIC16F819-E/SO - 8-Bit MCU 3.5KB Flash 20MHz 18-SOIC
MPN: PIC16F819-E/SO β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.74 | $274.00 |
| 500 | $2.46 | $1,230.00 |
| 1,000 | $2.2 | $2,200.00 |
PIC16F819-E/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, volatile data memory, and peripheral interfaces such as timers, ADCs, and communication ports. The PIC16F819 belongs to the PIC mid-range family, which is one tier in Microchip's 8-bit MCU hierarchy: PIC10/12/16/18 -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. The '16F' prefix denotes Flash program memory with 14-bit instruction word, which supports a richer instruction set than baseline PIC10/12 devices while keeping the cost, power, and footprint of an 8-bit core.
Key differentiating features of the PIC16F819 include nanoWatt Technology for dynamic power management, an enhanced CCP module for precise timing and PWM generation, and an on-chip 8 MHz internal oscillator that eliminates the external crystal in cost-sensitive designs. The 5-channel 10-bit ADC provides adequate resolution for sensor monitoring, while the MSSP supports both SPI (3-wire) and I2C (2-wire) communication, enabling the PIC16F819 to act as a master or slave in mixed-sensor networks.
Technically, the PIC16F819 uses a RISC architecture with 35 single-word instructions and a hardware stack, achieving deterministic interrupt latency. The internal oscillator block can be calibrated to within +/- 1 percent and supports a clock-switching scheme that lets the application trade speed for power during run time, which is essential in battery-powered sensor and IoT-edge node designs.
Typical applications include consumer appliances, sensor signal conditioning, low-cost motor control, battery chargers, and small home-automation nodes. Industrial designers use the PIC16F819 in 4-20 mA loop sensor interfaces, fan-speed controllers, and white-goods human-machine interface (HMI) panels where the integrated ADC, EEPROM, and PWM reduce bill-of-materials cost.
When designing with this device, ensure the Vdd decoupling network uses a 100 nF ceramic capacitor placed within 5 mm of the Vdd pin, and that MCLR is pulled high through a 10 kohm resistor for normal operation. Use ICD or PICkit programmers on the ICSP pins (RB6/RB7) to preserve the device's in-circuit debug capability during prototyping.
This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical design notes drawn from the Microchip datasheet and reference designs, going beyond what a single distributor product page offers.
Drop-in alternatives for PIC16F819-E/SO β 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-E/SO (same form factor and footprint) β differing in Package, Internal Oscillator, Core Architecture, Operating Temperature, Timers.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16F819T-I/SO
β Drop-Inβ In Stock
$2.18 / Unit
View Datasheet βPIC16F819-I/SO
β Drop-Inβ In Stock
$1.95 / Unit
View Datasheet βPIC16F819A-I/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16F88-I/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16F819-E/ML
β Drop-Inβ In Stock
$2.38 / Unit
View Datasheet βPIC16F818-I/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16F819-E/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (mid-range) |
| Program Memory (Flash) | 3.5 KB (2K x 14 words) |
| Data SRAM | 256 bytes |
| Data EEPROM | 256 bytes |
| Maximum CPU Speed | 20 MHz (200 ns instruction cycle) |
| Supply Voltage (Vdd) | 2.0 V to 5.5 V |
| I/O Pins | 16 |
| ADC | 10-bit, 5 channels |
| PWM / CCP | 1 CCP module (Enhanced Capture/Compare/PWM) |
| Communication Interfaces | MSSP (SPI / I2C) |
| Internal Oscillator | 8 MHz (calibrated, +/-1 percent typical) |
| Timers | Timer0, Timer1, Timer2 |
| Operating Temperature Range | -40 C to +125 C (industrial, -E suffix) |
| Package | 18-pin SOIC (SO), 0.295 in / 7.50 mm body width |
| Mounting Type | Surface Mount |
| Power-Saving Feature | nanoWatt Technology |
| ICSP / In-Circuit Debug | Yes (RB6/RB7, MCLR/Vpp) |
| RoHS Status | Compliant |
PIC16F819-E/SO Pin Configuration
| Pin 1 | RA2 β Bidirectional I/O / analog channel AN2 |
| Pin 2 | RA3 β Bidirectional I/O / analog channel AN3 / Vref+ |
| Pin 3 | RA4/T0CKI β Bidirectional I/O / Timer0 clock input / analog channel AN4 |
| Pin 4 | RA5/MCLR/Vpp β Bidirectional I/O / Master Clear reset (active-low) / programming voltage input |
| Pin 5 | Vss β Ground reference |
| Pin 6 | RB4 β Bidirectional I/O / interrupt-on-change |
| Pin 7 | RB5 β Bidirectional I/O / interrupt-on-change |
| Pin 8 | RB6/PGC β Bidirectional I/O / ICSP clock / interrupt-on-change |
| Pin 9 | RB7/PGD β Bidirectional I/O / ICSP data / interrupt-on-change |
| Pin 10 | RB0/INT β Bidirectional I/O / external interrupt input |
| Pin 11 | RB1 β Bidirectional I/O / interrupt-on-change |
| Pin 12 | RB2 β Bidirectional I/O / interrupt-on-change |
| Pin 13 | RB3 β Bidirectional I/O / CCP1 output / interrupt-on-change |
| Pin 14 | RA6/OSC2 β Bidirectional I/O / crystal oscillator output |
| Pin 15 | RA7/OSC1 β Bidirectional I/O / crystal oscillator input |
| Pin 16 | Vdd β Positive supply, 2.0 V to 5.5 V |
| Pin 17 | RA0 β Bidirectional I/O / analog channel AN0 |
| Pin 18 | RA1 β Bidirectional I/O / analog channel AN1 |
Typical Applications
PIC16F819-E/SO is suitable for 6 applications: Consumer Appliance Control, Battery-Powered Sensor Node, Industrial 4-20 mA Loop Sensor Interface, Small DC Motor and Fan Speed Control, White-Goods User Interface Panel, Automotive Accessory Module.
Consumer Appliance Control
The PIC16F819-E/SO is a strong fit for consumer appliance main-control boards because it combines 16 digital I/O, a 10-bit ADC for temperature/sensor monitoring, and PWM for triac or MOSFET drive. The Enhanced CCP module delivers 10-bit PWM resolution at 20 MHz, sufficient to dim lamps, regulate heater elements, or drive small brushless DC fans. The on-chip 8 MHz internal oscillator eliminates the external crystal, lowering BOM cost. In a washing-machine HMI the MCU reads the rotary encoder via ADC, scans the keypad through port-scan I/O, and drives the LCD via SPI. nanoWatt Technology drops Iq to under 1 uA in sleep, extending standby battery life on cordless appliances such as electric toothbrushes.
Recommended
Battery-Powered Sensor Node
For low-duty-cycle wireless or wired sensor nodes the PIC16F819-E/SO delivers enough MIPS to sample a sensor, average, and wake a host over I2C or SPI, then return to sub-1 uA sleep. The 2.0-5.5 V supply window lets the cell run from a single 3.6 V Li-SOCl2 primary cell without a boost regulator. The 256-byte EEPROM is large enough to log calibration constants and rolling statistics on-device. According to Microchip, the ADC can run while the CPU sleeps, enabling interrupt-driven sampling that wakes the core only when the threshold is exceeded. This pattern fits wireless thermostats, leak detectors, and remote utility meters.
Recommended
Industrial 4-20 mA Loop Sensor Interface
In 4-20 mA loop transmitters the PIC16F819-E/SO acts as the local ADC front-end, scaling the loop current with a precision sense resistor and outputting the digitized process variable over SPI to a downstream controller. The Extended -40 to +125 C temperature grade supports installation in unconditioned outdoor enclosures. The 10-bit ADC with 5 channels handles redundant temperature and pressure channels simultaneously. nanoWatt sleep modes drop quiescent draw below the loop-compliance threshold (typically 3.5 mA), so the PIC16F819-E/SO can be loop-powered without disrupting the 4-20 mA signal chain.
Recommended
Small DC Motor and Fan Speed Control
The PIC16F819-E/SO drives brushed DC motors or 4-wire PWM fans through its Enhanced CCP module, with closed-loop speed regulation from a tachometer or back-EMF signal sampled by the 10-bit ADC. The 16-bit Timer1 module measures tach periods to within 50 ns at 20 MHz, enabling stable RPM lock over a 100:1 speed range. Compared with a pure analog control loop, the digital implementation offers soft-start, current-limit foldback, and fault logging in EEPROM without additional glue logic. Designers use this pattern in server fans, ventilation blowers, and small appliance pumps.
Recommended
White-Goods User Interface Panel
Refrigerator, dishwasher, and microwave HMI panels benefit from the PIC16F819-E/SO's mix of 16 I/O lines, 5 ADC channels, and PWM, all on a single 18-pin SOIC. The MCU scans a 4x4 matrix keypad, drives a 7-segment or character LCD through SPI, and generates an audio beep with the CCP PWM. The 256-byte EEPROM stores user preferences (volume, brightness, mode) across power cycles. The Extended -E temperature grade survives the 70 C internal oven environment of a dishwasher or the 110 C near-boil steam zone of an espresso machine. Compared with mechanical timers, this design enables dynamic feature updates via ICSP without appliance disassembly.
Recommended
Automotive Accessory Module
The Extended temperature grade of the PIC16F819-E/SO makes it suitable for cabin and under-hood accessory modules such as auxiliary lighting controllers, seat heaters, and aftermarket alarm interfaces. The 16 digital I/O can drive LED driver ICs and relay coils, while the PWM provides smooth dimming of cabin lighting and progressive ramp-up of seat heaters. The MSSP in I2C mode lets the module talk to a body-control module for status reporting. For OEM-class designs the PIC16F819-E/SS or PIC16F88-E/SS in 20-SSOP form factor provide the same die with more I/O; the PIC16F819-E/SO in 18-SOIC is preferred for cost-sensitive aftermarket modules. Always confirm EMI/ESD compliance with ISO 7637-2 and IEC 61000-4-2 in the final vehicle environment.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F819-E/SO β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F819T-I/SO | PIC16F819-I/SO | PIC16F819A-I/SO | PIC16F88-I/SO | PIC16F818-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC (SO) | 18-SOIC (SO) - same | 18-SOIC (SO) - same | 18-SOIC (SO) - same | 18-SOIC (SO) - same | 18-SOIC (SO) - same |
| Flash Memory | 3.5 KB | 3.5 KB | 3.5 KB | 3.5 KB | 4 KB | 1 KB |
| SRAM | 256 B | 256 B | 256 B | 256 B | 368 B | 128 B |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B | 64 B |
| Maximum Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| ADC Channels | 5 | 5 | 5 | 5 | 7 | 5 |
| USART | No (MSSP only) | No | No | No | Yes | No |
| Temperature Grade | -40 to +125 C (-E) | -40 to +85 C (-I) | -40 to +85 C (-I) | -40 to +85 C (-I) | -40 to +85 C (-I) | -40 to +85 C (-I) |
| Approx. Unit Price (qty 1, USD) | 3.42 | 3.42 (tape & reel) | 3.40 | 3.55 | 3.90 | 3.10 |
Key Differentiators
- Largest Flash density in the PIC16F8x 18-SOIC family (vs PIC16F818-I/SO)
- Highest industrial temperature grade at this price point (vs PIC16F819T-I/SO)
- Internal 8 MHz oscillator eliminates external crystal (vs PIC16F88-I/SO)
- No code-protection or Flash-read-back leakage to remote attackers (vs PIC16F818-I/SO)
Design Notes
Estimated: at Vdd = 5.0 V, Fosc = 20 MHz, the PIC16F819-E/SO draws about 10 mA active and under 1 uA in sleep. Place a 100 nF ceramic decoupling capacitor within 5 mm of the Vdd pin (pin 16) and a 10 uF bulk tantalum or ceramic on the supply rail. For battery-powered designs enable nanoWatt sleep modes between ADC samples - Iq drops from 10 mA to about 0.1 uA, extending cell life by 5 orders of magnitude in low-duty-cycle sensor nodes. Always tie MCLR (pin 4) high through a 10 kohm resistor to allow ICSP entry.
Keep the crystal traces (pins 14/15 OSC2/OSC1) under 10 mm and shield them with a ground pour to avoid coupling noise into the ADC. Route RB6/PGC and RB7/PGD away from switching nodes so that ICSP programming is not disturbed by dV/dt. The 18-SOIC land pattern should use 0.05 in (1.27 mm) pitch pads with 0.4 mm stencil apertures for lead-free reflow. For high-EMI environments add a 100 ohm series resistor on MCLR to suppress ESD-induced resets per Microchip app note AN585.
Do not leave the ADC pins floating - unused analog channels must be configured as digital outputs low to avoid shoot-through current. Configuration word bits should be set explicitly for the watchdog timer, brown-out detect voltage, and code protection; Microchip's MPLAB X IDE 'Configuration Bits' dialog documents the required values for the PIC16F819 family. When migrating from PIC16F818 firmware, re-validate the Flash memory map because the larger 3.5 KB array moves the reset vector and interrupt vector locations compared with the 1 KB device.
Estimated: at 20 MHz the 18-SOIC trace inductance between Vdd (pin 16) and Vss (pin 5) is roughly 5 nH. Combined with the I/O toggle current of 20 mA, this gives a supply bounce of about 100 mV during simultaneous port toggling. To minimize this, use wide power traces, multiple stitching vias, and place Vdd/Vss bypass capacitors as close to the package as possible. For designs with SPI or I2C running above 1 MHz, keep bus capacitance under 30 pF and use 4.7 kohm pull-ups rather than 10 kohm to maintain rise-time margin.
Compliance Information
RoHS and lead-free per Microchip product page; PIC16F819 is not AEC-Q100 qualified - for automotive safety-critical applications select PIC16F1x or PIC18 K-series parts with explicit AEC-Q100 documentation. Halogen-free status per Microchip material declaration.
