PIC18LF2321-I/ML - 8KB Flash 8-bit MCU, 40MHz, 28-QFN | Microchip
N.º da peça: PIC18LF2321-I/ML ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $3.42 | $3,42 |
| 10 | $3.08 | $30,80 |
| 100 | $2.74 | $274,00 |
| 500 | $2.39 | $1.195,00 |
| 1.000 | $2.1 | $2.100,00 |
PIC18LF2321-I/ML Visão geral
This device is part of the PIC microcontroller family, which is a RISC (Reduced Instruction Set Computer) architecture widely used in embedded control applications. PIC microcontrollers are 8-bit MCUs that combine Flash program memory, RAM, EEPROM, configurable digital I/O, and on-chip peripherals (ADC, timers, UART, SPI, I2C) on a single chip. They sit within the broader hierarchy of microcontrollers -> microprocessors -> ICs -> semiconductors, and are favored in industrial, automotive, consumer, and IoT applications for their deterministic performance, low power, and ease of programming through MPLAB X IDE.
The PIC18LF2321-I/ML features a 10-bit ADC with up to 28 channels (varies by package), multiple capture/compare/PWM modules, an enhanced USART, MSSP (SPI/I2C) interface, and a 25 I/O pin count in the 28-QFN package. It supports a wide operating voltage range of 2.0V to 5.5V (LF variant), making it suitable for both battery-powered and 5V regulated systems. The /ML suffix indicates the 28-pin QFN industrial temperature grade (-40C to +85C).
Architecture-wise, this device uses a 16-bit-wide instruction word with an 8-bit data path, allowing most instructions to execute in a single cycle. The integrated nanoWatt Technology provides multiple power-managed modes (Idle, Sleep, and Run) for battery-sensitive designs, while the self-reprogrammable Flash under software control enables flexible field updates.
Typical applications include industrial sensor nodes, low-power IoT edge devices, battery-powered instrumentation, HVAC control, motor control loops, USB-to-UART bridges, and consumer appliances. The combination of 8 KB Flash, 25 I/O, and integrated 10-bit ADC allows engineers to replace multiple discrete components with a single chip.
Design consideration: the exposed thermal pad on the QFN package must be soldered to the PCB ground plane for proper thermal dissipation, RF performance, and mechanical reliability. Always follow Microchip's QFN PCB layout guidelines to avoid solder joint fatigue.
This page synthesizes distributor pricing, drop-in alternative MPNs from the Microchip PIC18 family, and practical design notes not aggregated on the manufacturer product page.
Alternativas drop-in para PIC18LF2321-I/ML — 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 PIC18LF2321-I/ML (mesmo formato e footprint) — diferindo em Package, Operating Temperature, ADC, Core, I/O Pins.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
PIC18LF2320-I/ML
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PIC18F2321-I/ML
✅ Drop-In✓ Em estoque
$3.17 / unidade
Ver ficha técnica →PIC18LF2221-I/ML
✅ Drop-In✓ Em estoque
$1.4 / unidade
Ver ficha técnica →PIC18LF2220-I/ML
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
PIC18LF2321-I/ML Classificações máximas e características elétricas
| Core | PIC 8-bit RISC |
| Instruction Set Width | 16-bit |
| Program Memory (Flash) | 8 KB (4K x 16) |
| Data RAM | 512 bytes |
| Data EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Operating Voltage | 2.0 V to 5.5 V |
| I/O Pins | 25 |
| ADC | 10-bit, up to 28 channels |
| Communication Interfaces | EUSART, MSSP (SPI/I2C) |
| Encapsulamento | 28-QFN (6x6 mm) with exposed pad |
| Temperatura de operação | -40C to +85C (Industrial) |
| Tipo de montagem | Surface Mount |
| Power-Saving Modes | nanoWatt Technology (Idle / Sleep / Run) |
Configuração de pinos do PIC18LF2321-I/ML
| Pino 1 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Pino 2 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Pino 3 | RA2/AN2/VREF- — Digital I/O / Analog input / ADC VREF- |
| Pino 4 | RA3/AN3/VREF+ — Digital I/O / Analog input / ADC VREF+ |
| Pino 5 | RA4 — Digital I/O (open-drain) |
| Pino 6 | RA5/AN4 — Digital I/O / Analog input channel 4 |
| Pino 7 | VSS — Ground reference |
| Pino 8 | OSC1/CLKIN — Crystal oscillator input / external clock |
| Pino 9 | OSC2/CLKOUT — Crystal oscillator output |
| Pino 10 | RC0 — Digital I/O / PWM output |
| Pino 11 | RC1 — Digital I/O / PWM output |
| Pino 12 | RC2/CCP1 — Digital I/O / Capture-Compare-PWM 1 |
| Pino 13 | RC3 — Digital I/O / SPI/I2C clock |
| Pino 14 | RC4 — Digital I/O / SPI/I2C data |
| Pino 15 | RC5 — Digital I/O / SPI/I2C data |
| Pino 16 | RC6/TX — Digital I/O / EUSART TX |
| Pino 17 | RC7/RX — Digital I/O / EUSART RX |
| Pino 18 | RB0/INT0 — Digital I/O / External interrupt 0 |
| Pino 19 | RB1/INT1 — Digital I/O / External interrupt 1 |
| Pino 20 | RB2 — Digital I/O |
| Pino 21 | RB3 — Digital I/O |
| Pino 22 | RB4 — Digital I/O |
| Pino 23 | RB5 — Digital I/O |
| Pino 24 | RB6/PGC — Digital I/O / ICSP clock |
| Pino 25 | RB7/PGD — Digital I/O / ICSP data |
| Pino 26 | VDD — Positive supply (2.0-5.5 V) |
| Pino 27 | VSS — Ground reference |
| Pino 28 | MCLR/VPP — Master clear reset (active-low) / programming voltage |
Aplicações típicas
PIC18LF2321-I/ML é adequado para 6 aplicaçãos: Industrial Sensor Hubs, Battery-Powered IoT Edge Nodes, HVAC and Building Control, Consumer Appliance Control, Motor Control and PWM Drivers, Automotive Aftermarket Accessories.
Industrial Sensor Hubs
The PIC18LF2321-I/ML fits industrial sensor hubs because its 25 I/O pins and 10-bit ADC let it aggregate multiple analog sensors (temperature, pressure, humidity) in a single chip. The 2.0-5.5 V supply range lets it run from a 24V industrial rail with a small LDO, while the 8 KB Flash holds protocol stacks for 4-20 mA loop output or Modbus framing. Its nanoWatt sleep mode drops quiescent current to the nA range between sensor reads, suiting remote solar-powered installations.
Recomendado
Battery-Powered IoT Edge Nodes
The PIC18LF2321-I/ML's wide 2.0-5.5 V supply range and nanoWatt sleep technology make it a strong choice for battery-powered IoT edge nodes that wake periodically to read sensors and transmit. The 8 KB Flash accommodates lightweight wireless stacks (LoRaWAN, BLE beaconing) and the 512 B RAM is sufficient for short packet buffers. At deep sleep with RTC tick at 32 kHz, the chip draws sub-microamp current, extending coin-cell or 2x AA battery life to multiple years.
Recomendado
HVAC and Building Control
The PIC18LF2321-I/ML fits HVAC and building automation controllers because its 25 I/O can drive relays, triacs, and valve actuators while the 10-bit ADC reads thermistor/resistive temperature sensors. The wide operating temperature of -40C to +85C suits unconditioned equipment closets, and the 5V tolerance integrates directly with legacy thermostat wiring. The 8 KB Flash holds proportional-integral control loops and 7-day scheduling logic for smart thermostats.
Recomendado
Consumer Appliance Control
The PIC18LF2321-I/ML is well-suited to consumer appliance main-control boards (coffee machines, small kitchen appliances, washing-machine user-interface panels). Its EUSART and MSSP blocks drive character LCDs and capacitive touch controllers, while the 8 KB Flash supports user-interface state machines and safety logic. The industrial temperature grade and surface-mount QFN package meet reliability requirements for white goods.
Recomendado
Motor Control and PWM Drivers
The PIC18LF2321-I/ML's enhanced CCP/ECCP modules deliver PWM outputs suitable for brushed DC and small stepper motor control in toys, small fans, and valve actuators. The 40 MHz core closes PID loops fast enough for sub-millisecond update rates, while the 25 I/O pins carry encoder feedback, limit switches, and H-bridge control signals. Pairing with Microchip's TC4469 gate driver provides robust MOSFET switching for brushed DC motors up to several amps.
Recomendado
Automotive Aftermarket Accessories
The PIC18LF2321-I/ML powers automotive aftermarket accessories such as auxiliary lighting controllers, alarm-system interfaces, and OBD-II loggers. Its 2.0-5.5 V supply tolerates 12V battery cranking transients when paired with a TVS diode and LDO. The industrial temperature grade suits cabin and engine-bay installations, while the 8 KB Flash holds CAN/LIN framing libraries and diagnostic-logging routines for aftermarket telematics.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PIC18LF2321-I/ML — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | PIC18LF2320-I/ML | PIC18F2321-I/ML | PIC18LF2221-I/ML | PIC18LF2220-I/ML |
|---|---|---|---|---|---|
| Package | 28-QFN (6x6 mm) | 28-QFN (6x6 mm) - same | 28-QFN (6x6 mm) - same | 28-QFN (6x6 mm) - same | 28-QFN (6x6 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 8 KB | 8 KB | 8 KB | 2 KB | 2 KB |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| I/O Pins | 25 | 25 | 25 | 25 | 25 |
| CPU Speed | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS |
| ADC | 10-bit | 10-bit | 10-bit | 10-bit | 10-bit |
| Unit Price (qty 1, as of 2026-09-28) | $3.42 | ~$3.30 | ~$3.50 | ~$2.40 | ~$2.30 |
Principais diferenciais
- Wider supply range than PIC18F2321-I/ML (vs PIC18F2321-I/ML)
- More Flash than PIC18LF2221-I/ML (vs PIC18LF2221-I/ML)
- Includes second analog comparator missing from PIC18LF2320-I/ML (vs PIC18LF2320-I/ML)
- Industrial -40C to +85C operation (vs PIC18F2321T-I/ML (extended temp variant))
Notas de projeto
The 28-QFN exposed thermal pad must be soldered to a continuous ground copper pour on the PCB. Microchip recommends at least 16 thermal vias (0.3 mm drill, 1.0 mm pitch) connecting the pad to internal ground planes. Without proper soldering, the part's mechanical reliability drops sharply and ground return impedance for analog peripherals rises, increasing ADC noise. Always follow Microchip application note AN233 for QFN PCB layout.
Decouple VDD with a 100 nF ceramic capacitor placed within 3 mm of each VDD pin, plus a bulk 10 uF tantalum or aluminum polymer capacitor on the supply rail. For ADC accuracy, place a ferrite bead between digital and analog VDD rails when the board has switching converters nearby. The /ML suffix indicates industrial temperature range, so verify capacitor dielectric (X5R/X7R) supports -40C operation if exposed to cold environments.
Do not leave the MCLR pin floating. Tie MCLR to VDD through a 10 kohm pull-up resistor, with an optional 100 nF cap to VSS for noise immunity. Programming failures and spurious resets are almost always traceable to a missing or undersized MCLR pull-up. Also, ensure the PGC/PGD pins (RB6/RB7) are not loaded by external pull-ups that exceed 10 kohm, or ICSP programming will fail.
When using the ADC, source impedance should be below 10 kohm to avoid conversion errors caused by the Sample-and-Hold capacitor charging incompletely. Add an op-amp buffer (e.g., MCP6001) when reading high-impedance sensors. Keep analog traces short and routed over a continuous ground plane to minimize ADC noise coupling from digital I/O switching.
Informações de conformidade
RoHS and lead-free compliance assumed for active Microchip PIC18 family parts; AEC-Q100 not applicable (industrial grade, not automotive qualified - Microchip does not publish Q100 status for this part).
