PIC18LF2431T-I/ML - 8-Bit 40MHz PIC MCU 16KB Flash 28-QFN | Microchip
Teilenummer: PIC18LF2431T-I/ML ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $5.12 | $5,12 |
| 10 | $4.62 | $46,20 |
| 100 | $3.95 | $395,00 |
| 500 | $3.42 | $1.710,00 |
| 1.000 | $3.05 | $3.050,00 |
PIC18LF2431T-I/ML Übersicht
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, integrating a CPU core, non-volatile program memory (FLASH/ROM), volatile data memory (RAM), EEPROM for user data, and a rich set of on-chip peripherals. MCUs sit within the broader hierarchy of: microcontroller -> embedded processor -> semiconductor IC -> integrated circuit. PIC microcontrollers from Microchip use a Harvard-architecture RISC core, distinguishing them from von-Neumann CISC designs and making PIC MCUs popular for deterministic real-time control with predictable interrupt latency.
The PIC18LF2431 belongs to Microchip's PIC18F2331/2431/4331/4431 family, which adds dedicated peripherals targeted at motor-control and power-conversion applications: a Power Control PWM module with up to 8 PWM channels, a 10-bit ADC with up to 9 input channels, a quadrature encoder interface (QEI) for rotor position sensing, and a 16-bit Capture/Compare/PWM module. These dedicated hardware blocks differentiate this family from generic PIC18F MCUs and enable closed-loop BLDC, PMSM and AC-induction motor control without external DSP chips.
Communication interfaces include I2C, SPI and UART/USART, enabling the device to serve as a peripheral controller in larger systems or as a standalone control node with sensor and actuator I/O. The wide operating voltage range (typically 2.0V to 3.6V for the LF variant) and 40MHz clock make the part suitable for battery-powered and industrial 3.3V systems.
Typical applications include sensored and sensorless BLDC/PMSM motor drives (fans, pumps, drones, e-bikes), small appliance control (mixers, vacuum cleaners, washing machines), HVAC fan and damper actuators, three-phase PFC and inverter stages, and general-purpose 8-bit embedded control with PWM-heavy I/O. The dedicated QEI and Power Control PWM blocks make it particularly attractive when BLDC commutation must be done in hardware rather than software.
When designing with this device, allocate PCB area for the QFN exposed thermal pad (EP) and stitch its via array to the ground plane for thermal dissipation and low-impedance analog references. Use Microchip's MPLAB X IDE with the XC8 compiler and MPLAB ICD 5 in-circuit debugger for development; the same ICD 5 supports PIC, AVR and SAM devices, allowing a single debug probe across heterogeneous designs.
This page synthesizes distributor stock, parametric drop-in alternatives from the same PIC18 family, and practical PCB layout notes not found in the manufacturer datasheet.
Drop-in-Alternativen für PIC18LF2431T-I/ML – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit PIC18LF2431T-I/ML (gleiche Bauform und Footprint) – abweichend in Package, Operating Temperature, I/O Pins, ADC, Communication.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
PIC18LF2331T-I/ML
✅ Drop-In✓ Auf Lager
$2.85 / Stück
Datenblatt ansehen →PIC18LF4331T-I/ML
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
PIC18LF4431T-I/ML
✅ Drop-In ⚠️ Spezifikationen ungeprüft✓ Auf Lager
$1.74 / Stück
Datenblatt ansehen →PIC18LF2431-I/ML
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
PIC18LF2431-I/SP
✅ Drop-In✓ Auf Lager
$4.4 / Stück
Datenblatt ansehen →PIC18LF2431-I/SO
✅ Drop-In✓ Auf Lager
$3.1 / Stück
Datenblatt ansehen →PIC18F2431-I/ML
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
PIC18LF2431T-I/ML Grenzwerte & elektrische Eigenschaften
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Family | PIC18F2331/2431/4331/4431 |
| Core Frequency | 40 MHz max |
| Program Memory (FLASH) | 16 KB (8K x 16) |
| Data Memory (SRAM) | 768 bytes |
| Non-volatile Data Memory (EEPROM) | 256 bytes |
| Operating Voltage (LF variant) | 2.0 V to 3.6 V |
| Communication Interfaces | I2C, SPI, UART/USART |
| ADC | 10-bit, up to 9 channels |
| Power Control PWM | Up to 8 PWM channels |
| Quadrature Encoder Interface (QEI) | Yes |
| Gehäuse | 28-QFN (6x6 mm) with exposed pad |
| Package Code (JEDEC) | HVQCCN |
| Betriebstemperatur | -40 C to +85 C (Industrial, "I" grade) |
| Montageart | Surface Mount |
| RoHS | Compliant |
| Lead-Free | Yes |
PIC18LF2431T-I/ML Pin-Konfiguration
| Pin 1 | RA0/AN0 — GPIO / analog input 0 |
| Pin 2 | RA1/AN1 — GPIO / analog input 1 |
| Pin 3 | RA2/AN2 — GPIO / analog input 2 |
| Pin 4 | RA3/AN3 — GPIO / analog input 3 |
| Pin 5 | RA4 — GPIO |
| Pin 6 | RA5 — GPIO |
| Pin 7 | VSS — Ground |
| Pin 8 | OSC1/CLKIN — Crystal oscillator input |
| Pin 9 | OSC2/CLKOUT — Crystal oscillator output |
| Pin 10 | RC0 — GPIO / PWM |
| Pin 11 | RC1 — GPIO / PWM |
| Pin 12 | RC2 — GPIO / PWM |
| Pin 13 | RC3 — GPIO / PWM |
| Pin 14 | RC4 — GPIO |
| Pin 15 | RC5 — GPIO |
| Pin 16 | RC6 — GPIO / UART TX |
| Pin 17 | RC7 — GPIO / UART RX |
| Pin 18 | RB0 — GPIO / interrupt |
| Pin 19 | RB1 — GPIO / interrupt |
| Pin 20 | VDD — Positive supply (2.0V-3.6V for LF variant) |
| Pin 21 | RB2 — GPIO |
| Pin 22 | RB3 — GPIO |
| Pin 23 | RB4 — GPIO |
| Pin 24 | RB5 — GPIO / PWM |
| Pin 25 | RB6 — GPIO / PWM |
| Pin 26 | RB7 — GPIO / PWM |
| Pin 27 | AVSS — Analog ground |
| Pin 28 | AVDD — Analog positive supply |
| Pin EP | EP — Exposed thermal pad - tie to ground for thermal dissipation |
Typische Anwendungen
PIC18LF2431T-I/ML ist geeignet für 7 Anwendungs: Sensorless BLDC Motor Control, Sensored PMSM / AC Induction Motor Drive, Small Appliance Control, HVAC Fan and Damper Actuators, Three-Phase PFC and Inverter Power Stage Controller, Battery-Powered Robotic and Drone BLDC ESC, General-Purpose 8-bit Embedded Control.
Sensorless BLDC Motor Control
The PIC18LF2431T-I/ML is purpose-built for sensorless BLDC and PMSM motor drives. Its on-chip Power Control PWM module delivers up to 8 complementary PWM channels with programmable dead-band, eliminating the need for an external gate-driver timing engine. The 16-bit Capture/Compare/PWM module and dedicated Quadrature Encoder Interface (QEI) read Hall sensors or optical encoders directly, while the 10-bit ADC samples back-EMF through the motor windings for position estimation. In a 24V fan or pump controller the LF variant's 2.0V-3.6V range pairs with a 3.3V LDO from the 24V bus. Microchip application note AN1078 provides complete sensorless BLDC firmware for this exact family, reducing firmware development from months to weeks.
Empfohlen
Sensored PMSM / AC Induction Motor Drive
In sensored motor drives for e-bikes, drones and small appliances, the PIC18LF2431T-I/ML combines the dedicated QEI module with the Power Control PWM to read three Hall sensors and produce center-aligned PWM for a three-phase inverter in hardware. This hardware acceleration removes interrupt-rate pressure on the CPU - the firmware only adjusts speed/torque setpoints rather than performing software commutation. The 40MHz core gives enough MIPS for field-oriented control (FOC) loops at 20kHz PWM, while the 16KB FLASH accommodates a full FOC state machine plus communication stacks. Industrial-grade -40C to +85C operation makes the MCU suitable for outdoor enclosures and under-hood automotive-adjacent applications.
Empfohlen
Small Appliance Control
The PIC18LF2431T-I/ML fits washing-machine drum motors, vacuum-cleaner suction motors, blender speed controls, and range-hood fans. The LF low-voltage range (2.0V-3.6V) allows direct operation from rectified mains via a small non-isolated buck, eliminating the cost and complexity of an isolated supply. The on-chip PWM drives TRIAC or IGBT phase-angle control directly via opto-isolated gate drivers, and the UART/USART interfaces to a Wi-Fi or BLE module for smart-appliance connectivity. End-products benefit from the dedicated motor-control peripherals rather than implementing commutation in software on a generic MCU, reducing firmware development cost.
Empfohlen
HVAC Fan and Damper Actuators
HVAC variable-speed fans and electronically-controlled damper actuators require quiet motor operation and precise speed/position control. The PIC18LF2431T-I/ML handles the BLDC commutation in hardware through its Power Control PWM, while the QEI module reads the position feedback from the actuator's rotary encoder. The 10-bit ADC samples temperature sensors for closed-loop fan-speed regulation. Industrial -40C to +85C temperature rating supports rooftop and basement HVAC installations. SPI and UART interfaces allow daisy-chaining multiple actuators on an RS-485 bus back to the central HVAC controller.
Empfohlen
Three-Phase PFC and Inverter Power Stage Controller
The PIC18LF2431T-I/ML serves as the digital controller for three-phase active Power Factor Correction (PFC) stages and low-power inverter stages in solar micro-inverters, UPS systems and welding power sources. The Power Control PWM generates the 50/60Hz sine-modulated switching pattern with dead-band protection, while the fast ADC samples the rectified mains voltage and inductor current for average-current-mode control. The LF variant's 2.0V-3.6V operation simplifies analog supply design when the controller sits on the low-voltage side of an isolated gate driver. Adequate FLASH (16KB) and SRAM (768 bytes) accommodate the PFC and inverter state machines plus basic protection firmware.
Empfohlen
Battery-Powered Robotic and Drone BLDC ESC
In a battery-powered drone or robotic application, the PIC18LF2431T-I/ML is well suited for the BLDC Electronic Speed Controller (ESC) controlling the propellers or wheel motors. Operating from a 1S or 2S Li-ion pack via a 3.3V buck regulator, the LF variant's low-voltage core draws minimal current (typically under 10mA active), preserving flight time or runtime. The hardware PWM with dead-band generation drives the three-phase FET bridge directly, the QEI reads back-EMF or Hall sensors for sensorless or sensored commutation, and the UART serves DShot or standard PWM protocols from the flight controller. Industrial temperature rating handles outdoor drone operation in cold and hot weather.
Empfohlen
General-Purpose 8-bit Embedded Control
Beyond motor control, the PIC18LF2431T-I/ML functions as a capable general-purpose 8-bit MCU for any application requiring multiple PWM outputs, quadrature decoding, and analog sampling in a small QFN package. Examples include LED lighting controllers with dimming, automatic door locks with motor feedback, point-of-sale terminal peripherals, and industrial sensor hubs. The Harvard-architecture RISC core delivers predictable interrupt latency, the 16KB FLASH accommodates application firmware plus a bootloader, and the 256-byte EEPROM stores user settings and calibration data without external NVM. Low-voltage LF operation allows direct interface to modern 3.3V sensors and radios.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für PIC18LF2431T-I/ML – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | PIC18LF2331T-I/ML | PIC18LF4331T-I/ML | PIC18LF4431T-I/ML | PIC18LF2431-I/ML | PIC18LF2431-I/SP | PIC18LF2431-I/SO | PIC18F2431-I/ML |
|---|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| 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 | 28-SPDIP (different) | 28-SOIC (different) | 28-QFN (6x6 mm) - same |
| FLASH Program Memory | 16 KB | 8 KB | 8 KB | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| SRAM | 768 bytes | 768 bytes | 768 bytes | 768 bytes | 768 bytes | 768 bytes | 768 bytes | 768 bytes |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Operating Voltage | 2.0 V to 3.6 V (LF) | 2.0 V to 3.6 V (LF) | 2.0 V to 3.6 V (LF) | 2.0 V to 3.6 V (LF) | 2.0 V to 3.6 V (LF) | 2.0 V to 3.6 V (LF) | 2.0 V to 3.6 V (LF) | 4.2 V to 5.5 V (F) |
| Core Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Power Control PWM Channels | Up to 8 | Up to 8 | Up to 8 | Up to 8 | Up to 8 | Up to 8 | Up to 8 | Up to 8 |
| QEI (Quadrature Encoder Interface) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Wichtigste Unterscheidungsmerkmale
- Dedicated Power Control PWM with up to 8 channels and QEI module (vs. PIC18LF24K22)
- Pin-compatible 5V variant available without PCB change (vs. PIC18F2431 (5V variant))
- Larger FLASH than the 8KB sibling in identical package (vs. PIC18LF2331T-I/ML)
Designhinweise
Estimated: the 28-QFN (6x6 mm) exposed thermal pad (EP) carries heat out of the die. With theta_JA around 35 C/W on a standard 4-layer 1oz PCB with adequate EP via array (typically 9-16 thermal vias stitched to inner ground planes), the LF variant at 40MHz dissipates under 100 mW in active PWM-heavy motor-control loops. To keep junction temperature below the 85 C industrial limit, ensure the EP is soldered to the PCB with a continuous ground plane - skipped solder joints in the EP create hot spots that accelerate failure.
Place the 28-QFN decoupling capacitors as close as possible to VDD/AVDD and VSS/AVSS pins. Use a 100 nF ceramic on every VDD pin pair and a bulk 10 uF ceramic near the IC. Keep the analog and digital grounds joined at a single point under the IC with a star-ground topology to prevent digital switching noise from coupling into the ADC reference. For motor-control designs, separate the MCU analog ground from the high-current power-stage ground using a ground plane partition, joining at the bulk input capacitor negative terminal.
The LF variant operates only from 2.0 V to 3.6 V - never apply 5 V to VDD or the I/O pins. If your system has a 5 V rail (typical for legacy designs), use the PIC18F2431 instead, or add a 3.3 V LDO such as the MCP1700 between the 5 V rail and the LF MCU. Brown-out detection (BOR) should be enabled in configuration bits to prevent FLASH corruption during supply droops - this is critical for battery-powered designs where the supply can collapse below 2.0 V during motor stall events.
For motor-control designs using the on-chip Power Control PWM module, route the PWM output traces away from the ADC analog input traces to minimize capacitive coupling. Place the gate-driver circuit within 25 mm of the PWM pins to keep gate-drive loops short. Add a 10 kohm pull-down on the MCLR pin and a 100 nF cap on MCLR-to-VDD to prevent spurious resets from switching noise. Use Microchip's AN1078 and AN1160 application notes as layout references for sensorless and sensored BLDC designs using this exact MCU family.
A common mistake is selecting the LF variant on a 5 V supply - the PIC18LF2431 will be permanently damaged. Always confirm the suffix letter: F = 4.2-5.5 V, LF = 2.0-3.6 V. Another pitfall is omitting the ICSP programming header - the PIC18LF2431 requires PGC/PGD/MCLR/VSS/VPP access for in-circuit programming. Reserve a 5-pin 0.1" header footprint on prototype boards to allow ICD 5 debugging without rework. Lastly, do not enable the on-chip 16-bit Capture module and the Power Control PWM on the same pins without checking the datasheet pin map - peripheral pin-select conflicts will silently disable the second function.
Compliance-Informationen
RoHS and REACH compliant per distributor listings. Industrial temperature grade (-40C to +85C); AEC-Q100 automotive qualification is not_applicable for the standard industrial variant. Lead-free terminations per Microchip product page.
