PIC16F818-I/SS - 8-bit 20MHz 1.75KB Flash MCU | Microchip
N.º da peça: PIC16F818-I/SS ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $3.45 | $3,45 |
| 10 | $3.05 | $30,50 |
| 100 | $2.58 | $258,00 |
| 500 | $2.27 | $1.135,00 |
| 1.000 | $2.02 | $2.020,00 |
PIC16F818-I/SS Visão geral
An 8-bit microcontroller (MCU) is a single-chip computer that integrates an 8-bit CPU, program memory (ROM/Flash), data memory (RAM), I/O peripherals and a clock source on one silicon die. Within the embedded hierarchy, the PIC16F818 belongs to the PIC16F family of microcontrollers, which sits within Microchip's 8-bit PIC product line, which is itself a category of microcontrollers (MCU), which is a category of embedded processors, which is a category of semiconductors. The PIC16F818 is pin-compatible with the PIC16F819, and is software- and peripheral-compatible with the larger PIC16C7x, PIC16C62xA, PIC16C5X and PIC12CXXX families, giving designers an easy migration path from older OTP or ROM-based parts to Flash-based silicon.
Key features include an internal 8 MHz oscillator (no external crystal required for many designs), 16 I/O pins with individually programmable direction, a 10-bit ADC with up to 5 channels, an enhanced Capture/Compare/PWM (ECCP) module, an MSSP port supporting SPI and I2C (master/slave), an asynchronous USART for RS-232/RS-485, two 8-bit timers plus one 16-bit timer, and a watchdog timer with its own on-chip low-power RC oscillator. The Flash program memory supports in-circuit serial programming (ICSP) via two pins, allowing firmware updates after PCB assembly.
The PIC16F818 operates from 2.0 V to 5.5 V across the industrial -40C to +85C range, suiting it for 3.3 V and 5 V designs. With a typical active current of <2 mA at 4 MHz and 5 V, plus sub-microamp sleep currents with brown-out reset (BOR) enabled, the part targets low-power embedded nodes. The 20-pin SSOP (5.30 mm body) provides a compact 0.65 mm pitch footprint, balancing IO count with board-area efficiency.
Typical applications include consumer appliance control panels, sensor interface nodes, simple LED lighting controllers, low-cost motor control loops, and battery-powered instrument peripherals. For designs needing more memory or a second comparator, designers can drop in the PIC16F819 (2K Flash) without changing the PCB.
When designing with this MCU, reserve the ICSPDAT/ICSPCLK pins (typically RB7/RB6) so that in-circuit programming remains possible in production. Place a 100 nF decoupling capacitor within 5 mm of VDD, and a bulk 10 uF if the application drives heavy loads from the same rail. Verify MCLR behaviour - the device ships with MCLR disabled; an external pull-up or dedicated reset circuit may be required.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Alternativas drop-in para PIC16F818-I/SS — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com PIC16F818-I/SS (mesmo formato e footprint) — diferindo em Package, Core Architecture, ADC, Operating Temperature, Timers.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
PIC16F819-I/SS
✅ Drop-In✓ Em estoque
$2.11 / unidade
Ver ficha técnica →PIC16F818T-I/SS
✅ Drop-In✓ Em estoque
$1.92 / unidade
Ver ficha técnica →PIC16F818-E/SS
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PIC16F84A-I/P
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PIC16F87-I/SS
✅ Drop-In✓ Em estoque
$4.35 / unidade
Ver ficha técnica →PIC16F88-I/SS
✅ Drop-In✓ Em estoque
$3.08 / unidade
Ver ficha técnica →PIC16F818-I/SS Classificações máximas e características elétricas
| Core | 8-bit PIC16 RISC |
| Program Memory (Flash) | 1.75 KB (1K x 14 words) |
| Data RAM | 128 bytes |
| Data EEPROM | 128 bytes |
| Maximum CPU Speed | 20 MHz |
| Instruction Cycle | 200 ns |
| I/O Pins | 16 |
| ADC | 10-bit, 5 channels |
| Timers | 2 x 8-bit + 1 x 16-bit |
| Communication | SPI, I2C (MSSP), USART (RS-232/RS-485) |
| PWM | Enhanced CCP (ECCP) |
| Internal Oscillator | 8 MHz |
| Tensão de alimentação | 2.0 V to 5.5 V |
| Temperatura de operação | -40C to +85C (Industrial) |
| Encapsulamento | 20-pin SSOP (5.30 mm body, 0.65 mm pitch) |
| Watchdog Timer | Yes, with dedicated on-chip low-power RC oscillator |
| Brown-out Reset (BOR) | Yes |
| In-Circuit Programming | ICSP via 2 pins |
| Status RoHS | Compliant |
Configuração de pinos do PIC16F818-I/SS
| Pino 1 | RA0/AN0 — Digital I/O / ADC channel 0 input |
| Pino 2 | RA1/AN1 — Digital I/O / ADC channel 1 input |
| Pino 3 | RA2/AN2/VREF- — Digital I/O / ADC channel 2 / ADC negative reference |
| Pino 4 | RA3/AN3/VREF+ — Digital I/O / ADC channel 3 / ADC positive reference |
| Pino 5 | RA4/AN4/T0CKI — Digital I/O (open-drain) / ADC channel 4 / Timer0 clock input |
| Pino 6 | RA5/SS/AN5 — Digital I/O / SPI Slave Select / ADC channel 5 (20-pin only) |
| Pino 7 | RA6/OSC2/CLKO — Digital I/O / oscillator output / clock out |
| Pino 8 | RA7/OSC1/CLKI — Digital I/O / oscillator input / clock in |
| Pino 9 | VDD — Positive supply (2.0 V to 5.5 V) |
| Pino 10 | VSS — Ground reference |
| Pino 11 | RB0/INT — Digital I/O / external interrupt |
| Pino 12 | RB1 — Digital I/O |
| Pino 13 | RB2 — Digital I/O |
| Pino 14 | RB3/PGM — Digital I/O / LVP programming pin |
| Pino 15 | RB4 — Digital I/O |
| Pino 16 | RB5 — Digital I/O |
| Pino 17 | RB6/PGC — Digital I/O / ICSP clock |
| Pino 18 | RB7/PGD — Digital I/O / ICSP data |
| Pino 19 | MCLR/VPP/RE3 — Master clear / programming voltage / digital I/O |
| Pino 20 | NC — Not connected (no internal connection) |
Aplicações típicas
PIC16F818-I/SS é adequado para 6 aplicaçãos: Consumer Appliance Control Panels, Battery-Powered Sensor Nodes, LED Lighting Controllers, Low-Cost Motor Control Loops, Instrument and Metering Peripherals, In-Circuit Programmable IoT Bridges.
Consumer Appliance Control Panels
The PIC16F818-I/SS is well suited for consumer appliance control panels such as washing-machine interfaces, microwave keypads, and HVAC thermostat units. Its 1.75 KB of Flash is enough for keypad scanning, debounce logic, and LCD/segmented display drivers, while 128 bytes of EEPROM stores user preferences and last-state memory. The 10-bit ADC handles temperature or humidity sensor inputs in HVAC applications, and the USART links the control board to a main inverter board. Power is typically 5 V from the appliance rail, fully inside the PIC16F818's 2.0-5.5 V operating range. SSOP-20 fits inside tight user-interface bezels where every mm of board area matters.
Recomendado
Battery-Powered Sensor Nodes
Battery-powered sensor nodes benefit from the PIC16F818-I/SS nanoWatt technology features including sub-microamp sleep current, BOR, and a low-power watchdog on its own RC oscillator. A 4 MHz INTOSC plus sleep current under 1 uA lets the part run for years on a single CR2032 in intermittent duty. The MSSP peripheral handles I2C or SPI sensor readouts (temperature, pressure, accelerometers), and the internal 10-bit ADC samples additional analog channels without an external ADC chip. The part wakes on watchdog timeout, captures a sensor reading, decides if a radio wake-up is needed, and returns to sleep. Industrial -40C to +85C temperature range covers most outdoor and metering scenarios.
Recomendado
LED Lighting Controllers
Small-form-factor LED lighting controllers for under-cabinet fixtures, decorative strips, or aquarium lighting exploit the PIC16F818-I/SS's Enhanced CCP (ECCP) PWM module to drive one or more LED channels with hardware-based dead-band control. A 10-bit ADC reads ambient light sensors for daylight harvesting, and an internal 8 MHz oscillator removes the need for an external timing component. The MSSP accepts digital addressable LED protocols (WS2812-style) or analog current-sense feedback. With 16 I/O pins, the same SSOP-20 part handles several low-side LED drivers plus a DMX/RDM-style UART input. At 2.0 V minimum, the part runs from LED driver rails as low as two NiMH cells.
Recomendado
Low-Cost Motor Control Loops
Small DC motor and unipolar stepper control loops in toys, small appliances, and pumps can be built around the PIC16F818-I/SS with its ECCP PWM output, two 8-bit and one 16-bit timer. Closed-loop speed control via the 10-bit ADC reading back-EMF or current sense is straightforward in 1.75 KB of Flash. The USART communicates with a host controller or accepts sensorless position feedback. Industrial temperature rating lets the same firmware run in automotive accessories and white-goods motor boards. For more memory or higher PWM resolution, the pin-compatible PIC16F819-I/SS is the documented upgrade path without changing the PCB.
Recomendado
Instrument and Metering Peripherals
Peripherals for bench instruments, weighing scales, and metering devices use the PIC16F818-I/SS to read sensors, manage a small character LCD, and exchange data with a host through SPI or I2C. The 128-byte EEPROM saves calibration constants or user-defined ranges, eliminating the need for an external serial EEPROM. A 10-bit ADC with selectable VREF accommodates load-cell and shunt-resistor current measurements down to mV levels. The part operates over 2.0-5.5 V, fitting both battery-powered and line-powered instrument tops. The internal 8 MHz oscillator provides timing accuracy sufficient for most sensor-sampling work.
Recomendado
In-Circuit Programmable IoT Bridges
The PIC16F818-I/SS acts as a low-cost bridge between legacy industrial equipment and modern IoT gateways by serving as a serial protocol converter (RS-232/RS-485 USART to SPI or I2C to an attached radio module). Its Flash memory is in-circuit programmable via ICSP, allowing field firmware updates over a programming header without removing the device. Industrial -40C to +85C operation covers factory floors and outdoor cabinets. The watchdog timer on its own internal RC oscillator offers fail-safe operation independent of the main clock. Combined with the 128-byte EEPROM for bridge configuration storage, it is a cost-effective way to retrofit old equipment.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PIC16F818-I/SS — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | PIC16F819-I/SS | PIC16F818T-I/SS | PIC16F818-E/SS | PIC16F88-I/SS | PIC16F87-I/SS |
|---|---|---|---|---|---|---|
| Package | 20-pin SSOP | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP family - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 1.75 KB (1K x 14) | 3.5 KB (2K x 14) | 1.75 KB (1K x 14) | 1.75 KB (1K x 14) | 7 KB (4K x 14) | 7 KB (4K x 14) |
| Data RAM | 128 B | 128 B | 128 B | 128 B | 256 B | 256 B |
| Data EEPROM | 128 B | 128 B | 128 B | 128 B | 256 B | 256 B |
| Maximum CPU Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| I/O Pins | 16 | 16 | 16 | 16 | 16 | 16 |
| ADC Channels | 5 | 5 | 5 | 5 | 7 | 5 |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Extended -40C to +125C | Industrial -40C to +85C | Industrial -40C to +85C |
Principais diferenciais
- On-chip 128-byte EEPROM for data retention (vs PIC16F84A-I/P)
- On-chip 10-bit ADC eliminates external converter (vs PIC16F84A-I/P)
- Internal 8 MHz INTOSC removes external crystal (vs PIC16F84A-I/P)
- Enhanced CCP (ECCP) PWM for half-bridge/full-bridge drives (vs PIC16F84A-I/P)
Notas de projeto
ICSP pins RB7 (PGD) and RB6 (PGC) must remain accessible to the in-circuit programmer. Per the PIC16F818 datasheet (39598E), tying these pins hard to GND or VDD, or using them as heavy-current outputs without isolation resistors, can block production programming and field firmware updates. Keep the traces short and avoid large fanouts; if the pins must drive external circuitry, buffer them through a resistor network that does not exceed the programming port's drive.
Place a 100 nF (0.1 uF) decoupling capacitor within 5 mm of the VDD pin to filter high-frequency switching noise from the internal core, and add a bulk 10 uF on the board if multiple loads share the same 3.3 V or 5 V rail. Brown-out reset (BOR) is enabled by configuration word and holds the part in reset until VDD rises above the BOR threshold, which protects Flash during unstable power-up. Verify that the chosen BOR level matches the regulator's startup ramp time for the application.
When the internal 8 MHz oscillator is used, do NOT leave the OSC1/OSC2 (RA6/RA7) traces dangling. Per the datasheet (39598E), unconfigured oscillator pins must be left as standard digital I/O, but if crystal mode is selected in the configuration word, leave the traces symmetric and short to avoid stray capacitance mis-tuning the oscillator. Estimated: with a 20 MHz crystal and 15 pF loading caps, traces longer than 5 mm should be guarded with a grounded shield.
The 10-bit ADC reference (VREF+/VREF-) can be tied to VDD/VSS for cost-sensitive designs, but for accurate readings below 50 mV (current-sense, thermocouple junctions, weigh scales), use an external low-noise reference voltage tied to RA3/RA2. Estimated: with VDD=5 V and VREF+=4.096 V, each LSB of the 10-bit ADC measures 4 mV, which is adequate for most sensor bridge signals; an internal reference or external rail-to-rail buffer improves linearity at low ADC counts.
Informações de conformidade
Microchip's product page lists the SSOP-20 package as RoHS compliant and lead-free. The PIC16F818-I/SS is industrial-grade (-40C to +85C) and not AEC-Q100 qualified; for automotive applications the user should select a Q-graded Microchip part instead.
