PIC16F721T-I/SO - 8-Bit MCU, 7KB Flash, 16MHz, 20-SOIC | Microchip
N.º da peça: PIC16F721T-I/SO ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $1.95 | $1,95 |
| 10 | $1.75 | $17,50 |
| 100 | $1.52 | $152,00 |
| 500 | $1.32 | $660,00 |
| 1.000 | $1.18 | $1.180,00 |
PIC16F721T-I/SO Visão geral
A microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral interfaces. The PIC16F721 belongs to the 8-bit microcontroller hierarchy (microcontroller -> MCU -> embedded controller -> semiconductor IC) and sits within Microchip's PIC16 mid-range family, optimized for low-power, cost-sensitive designs that need more analog and communication peripherals than entry-level PIC10/PIC12 devices but do not require a 16-bit or 32-bit core.
Key features include a 12-channel 8-bit ADC for sensor acquisition, an 8-bit Capture/Compare/PWM (CCP) module for timing and motor control, two 8-bit timers (TMR0/TMR2) and one 16-bit timer (TMR1), 25mA source/sink I/O drive, and brown-out reset plus power-on reset for robust startup. The integrated nanoWatt XLP technology provides ultra-low sleep currents for battery-powered applications.
The device operates across 2.0V to 5.5V supply and is qualified to the industrial -40C to +85C temperature range. Its SOIC-20 footprint simplifies hand-soldered prototyping while remaining compatible with automated SMT assembly, and ICSP (In-Circuit Serial Programming) allows firmware updates without removing the device from the board.
Typical applications include consumer appliance control, sensor interface nodes, low-speed motor drivers, LED lighting controllers, and battery-powered IoT sensor endpoints. The wide voltage range and nanoWatt XLP make it suitable for battery-backed always-on designs such as remote controls and security sensors.
Design trade-offs include limited 7KB program memory, which constrains code complexity; engineers targeting larger firmware should evaluate the PIC16F722/PIC16F723 family for 14KB/7KB alternatives or step up to PIC18. Pin 1 reset/ICSP routing must be respected to allow in-circuit programming without removing the device.
This page synthesizes distributor pricing, drop-in replacement candidates, and practical design notes not consolidated in the manufacturer datasheet alone.
Alternativas drop-in para PIC16F721T-I/SO — 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 PIC16F721T-I/SO (mesmo formato e footprint) — diferindo em Package, I/O Pins, ADC, Operating Temperature, Timers.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
PIC16F721-I/SO
✅ Drop-In✓ Em estoque
$0.92 / unidade
Ver ficha técnica →PIC16F721T-E/SO
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PIC16F721T-I/SS
✅ Drop-In✓ Em estoque
$1.18 / unidade
Ver ficha técnica →PIC16F720T-I/SO
✅ Drop-In✓ Em estoque
$0.52 / unidade
Ver ficha técnica →PIC16F716T-I/SO
✅ Drop-In✓ Em estoque
$1.05 / unidade
Ver ficha técnica →PIC16F690-I/SO
✅ Drop-In✓ Em estoque
$1.62 / unidade
Ver ficha técnica →PIC16F721T-I/SO Classificações máximas e características elétricas
| Core Architecture | PIC16 Enhanced Mid-Range 8-bit |
| Instruction Set | 35 instructions, 8-level stack |
| Program Memory (Flash) | 7 KB (4K x 14 words) |
| Data SRAM | 256 bytes |
| EEPROM Data Memory | 128 bytes (non-volatile) |
| Maximum CPU Clock | 16 MHz (internal oscillator) |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 18 (bidirectional, 25 mA source/sink) |
| ADC | 12-channel, 8-bit |
| Serial Interfaces | I²C, SPI, AUSART |
| Timers | TMR0 (8-bit), TMR1 (16-bit), TMR2 (8-bit) |
| CCP Modules | 1x Capture/Compare/PWM |
| Watchdog Timer | Yes (WDT) |
| Resets | Power-on Reset (POR), Brown-out Reset (BOR) |
| Programming Interface | ICSP (In-Circuit Serial Programming) |
| Low-Power Feature | nanoWatt XLP technology |
| Faixa de temperatura de operação | -40 C to +85 C (Industrial) |
| Encapsulamento | 20-pin SOIC (300 mil) |
| Tipo de montagem | Surface Mount |
| Nível MSL | MSL1 (per JEDEC J-STD-020) |
| Status RoHS | Compliant |
Configuração de pinos do PIC16F721T-I/SO
| Pino 1 | RA3/MCLR#/VPP — Digital I/O / Master Clear (Reset, active low) / Programming voltage input |
| Pino 2 | RA4/AN3/C1OUT — Digital I/O / ADC channel 3 input / Comparator 1 output |
| Pino 3 | RA5/AN4/SS1 — Digital I/O / ADC channel 4 input / SPI Slave Select |
| Pino 4 | RA6/OSC2/CLKOUT — Digital I/O / Crystal oscillator output / Fosc clock output |
| Pino 5 | RA7/OSC1/CLKIN — Digital I/O / Crystal oscillator input / External clock input |
| Pino 6 | VSS — Ground reference |
| Pino 7 | RB0/AN12/INT — Digital I/O / ADC channel 12 input / External interrupt |
| Pino 8 | RB1/AN10 — Digital I/O / ADC channel 10 input |
| Pino 9 | RB2/AN8 — Digital I/O / ADC channel 8 input |
| Pino 10 | RB3/AN9/CCP1 — Digital I/O / ADC channel 9 input / Capture/Compare/PWM output |
| Pino 11 | RB4/AN11 — Digital I/O / ADC channel 11 input |
| Pino 12 | RB5 — Digital I/O |
| Pino 13 | RB6/PGC — Digital I/O / ICSP serial clock |
| Pino 14 | RB7/PGD — Digital I/O / ICSP serial data |
| Pino 15 | RA0/AN0 — Digital I/O / ADC channel 0 input |
| Pino 16 | RA1/AN1 — Digital I/O / ADC channel 1 input |
| Pino 17 | RA2/AN2 — Digital I/O / ADC channel 2 input |
| Pino 18 | RC0 — Digital I/O |
| Pino 19 | RC1 — Digital I/O |
| Pino 20 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
Aplicações típicas
PIC16F721T-I/SO é adequado para 6 aplicaçãos: Consumer Appliance Control, Battery-Powered Sensor Node, LED Lighting Controller, Remote Control / IR Transmitter, Low-Speed Motor / Fan Controller, Industrial Sensor / Process Monitor.
Consumer Appliance Control
The PIC16F721T-I/SO fits consumer appliance controllers because its 7 KB Flash holds sensor-acquisition, button-debounce, and triac-driving firmware while its 2.0-5.5 V VDD range accepts direct 3.3 V or rectified 5 V rails without level shifters. The 18 I/O pins at 25 mA source/sink can directly drive LED indicators and relay coils, eliminating external transistors. nanoWatt XLP keeps standby current under 1 uA, which matters for Energy Star appliance ratings. Compared with a discrete 8051 design, the integrated 12-channel 8-bit ADC consolidates temperature, humidity, and current-sensing inputs into one chip. Pair with a TRIAC optocoupler (MOC3021) for AC load switching; firmware updates via ICSP simplify factory programming and field recalls.
Recomendado
Battery-Powered Sensor Node
The PIC16F721T-I/SO is well-suited to wireless or wired sensor nodes powered by 2x AA or coin cells. Its nanoWatt XLP technology delivers sub-microamp sleep current, allowing years of life on a primary cell when the MCU spends most of its time dormant between measurements. The 12-channel 8-bit ADC reads thermistor, photocell, and battery-voltage signals directly, while the I²C/SPI/AUSART peripherals connect to NTC temperature sensors, accelerometers, or LoRa transceivers. The 128-byte non-volatile EEPROM stores calibration constants that survive battery swaps, and the internal 16 MHz oscillator eliminates the need for an external crystal, saving board area. BOR/POR ensure a clean wake-up after deep discharge.
Recomendado
LED Lighting Controller
The PIC16F721T-I/SO drives LED fixtures by combining its 8-bit CCP PWM channel with 18 I/O capable of 25 mA each, allowing direct FET gate drive for dimming MOSFETs. The 7 KB Flash stores DMX or 0-10 V dimming protocol stacks and color-mixing algorithms, while the 8-bit ADC samples ambient light for daylight harvesting. nanoWatt XLP keeps standby current low for always-on fixtures; BOR protects against brown-out flicker during AC mains sag. The SOIC-20 package is hand-solderable, easing custom fixture prototyping. SPI/AUSART peripherals interface to constant-current LED driver ICs such as the TLC5940 for higher-channel-count installations.
Recomendado
Remote Control / IR Transmitter
Line-of-sight IR remote controls leverage the PIC16F721T-I/SO's AUSART for IR modulation, internal 16 MHz oscillator for accurate carrier frequencies (36/38/40 kHz), and 2.0-5.5 V VDD that accepts direct 3 V coin-cell battery power. The 7 KB Flash holds complete RC5/RC6/Sony or proprietary IR protocol stacks with button matrix scanning, while nanoWatt XLP draws < 1 uA in sleep between button presses, giving multi-year battery life. The 18 I/O pins easily accommodate a 4x4 keypad matrix plus IR LED drive. Hardware CCP generates precise 38 kHz PWM without CPU overhead, freeing the core for protocol encoding and battery-voltage monitoring.
Recomendado
Low-Speed Motor / Fan Controller
Brushed DC and small stepper motor controllers fit the PIC16F721T-I/SO's capabilities. The 8-bit CCP generates PWM for H-bridge drive, while the 8-bit ADC reads back-EMF or current-sense signals from the motor bridge. The PIC16 mid-range instruction set executes the PID loop in 35 single-cycle instructions, and the 16 MHz clock gives 4 MIPS performance for responsive closed-loop control. nanoWatt XLP helps battery-operated robotics, while 25 mA I/O sink/source eliminates predrivers for small logic-level FETs. AUSART is used for command inputs from a host controller or Bluetooth module.
Recomendado
Industrial Sensor / Process Monitor
Industrial 4-20 mA loop-powered or 24 V sensor transmitters use the PIC16F721T-I/SO for digital signal conditioning. The 12-channel 8-bit ADC simultaneously samples multiple 4-20 mA inputs via shunt resistors, while the AUSART converts to Modbus RTU on RS-485 via external transceiver. The 128-byte EEPROM stores calibration and unit-tag data, and the industrial -40 to +85 C temperature grade handles panel-mounted equipment. nanoWatt XLP is critical for loop-powered 4-20 mA transmitters where the entire transmitter is fed from 3-4 mA quiescent current. ICSP allows firmware updates in hazardous areas without removing the sensor.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PIC16F721T-I/SO — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | PIC16F721-I/SO | PIC16F721T-E/SO | PIC16F720T-I/SO | PIC16F716T-I/SO | PIC16F690-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SOIC-20 | SOIC-20 - same | SOIC-20 - same | SOIC-20 - same | SOIC-20 - same | SOIC-20 - same |
| Flash Memory | 7 KB | 7 KB | 7 KB | 3.5 KB (-50%) | 7 KB | 7 KB |
| SRAM | 256 B | 256 B | 256 B | 128 B (-50%) | 128 B (-50%) | 256 B |
| Max CPU Clock | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 20 MHz | 20 MHz |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| Temperature Grade | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| ADC Count (incremental) | Free Stock | Free Stock | Free Stock | Free Stock | Free Stock | Free Stock |
Principais diferenciais
- Industrial temperature grade with extended supply range to 2.0 V (vs PIC16F721T-E/SO)
- Larger Flash and SRAM than mid-tier cousins (vs PIC16F720T-I/SO)
- Higher ADC channel count with nanoWatt XLP low-power feature (vs PIC16F716T-I/SO)
Notas de projeto
Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 20) and a bulk 10 uF capacitor at the board power-entry point. For noise-sensitive ADC measurements, add a 10 uF + 100 nF pair on AVDD (if used separately) to keep supply ripple below 1 LSB of the 8-bit ADC (about 20 mV at 5 V VREF). When the design is battery-powered, gate unused peripherals via firmware to minimize active current; nanoWatt XLP sleep current stays below 1 uA with WDT disabled.
Always include a 10 kohm pull-up on MCLR#/RA3 (pin 1) to ensure clean reset behavior. The PIC16F721 needs MCLR held high to run; floating MCLR can cause erratic resets in electrically noisy environments. Do not connect MCLR directly to VDD without the resistor - the ICSP programmer requires control of MCLR/VPP voltage for high-voltage programming. For low-voltage ICSP modes only, a direct MCLR-to-VDD connection is acceptable but eliminates in-circuit debugging.
Route the ICSP signals PGC (pin 13) and PGD (pin 14) directly to a 6-pin header without series resistors for ICSP mode. Keep these traces short (under 50 mm) and away from switching signals such as PWM outputs (CCP1 on pin 10) and high-current I/O. For crystal oscillator use, place the 2-pin crystal within 5 mm of pins 4-5 and guard the traces with a ground pour; the internal 16 MHz oscillator eliminates the crystal entirely for cost-down designs, saving 4-6 mm of board space.
The PIC16F721T-I/SO SOIC-20 has a typical theta_JA of about 80 C/W in still air, which is fine for the industrial -40 to +85 C range at moderate system-level ambient temperatures. No heatsink is required. Ensure that the 25 mA I/O current rating is not exceeded on any single pin (sum of all I/O source/sink currents limited to about 200 mA) - use external drivers such as the ULN2003 or discrete MOSFETs when controlling high-current loads.
Informações de conformidade
PIC16F721T-I/SO is RoHS compliant per Microchip product page. Industrial temperature grade -40C to +85C; not AEC-Q100 qualified. For AEC-Q100 automotive, choose the PIC16F721-E/SS extended-grade variant or higher PIC18 parts.
