PIC18LF2431-I/MM - 8-bit 40MHz 16KB Flash MCU 28-QFN | Microchip
Teilenummer: PIC18LF2431-I/MM ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $5.1 | $5,10 |
| 10 | $4.62 | $46,20 |
| 100 | $4.08 | $408,00 |
| 500 | $3.56 | $1.780,00 |
| 1.000 | $3.05 | $3.050,00 |
PIC18LF2431-I/MM Übersicht
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and peripheral interfaces. The PIC18F family uses a modified Harvard RISC architecture with 16-bit opcodes and 8-bit data, supported by 77 single-word instructions. Within the broader taxonomy, this part belongs to microcontrollers -> 8-bit MCUs -> embedded controllers -> semiconductors. The 'LF' low-voltage variant enables battery-powered or USB bus-powered designs, while the standard PIC18F2431 version targets 4.2 V to 5.5 V systems.
Key features include 16 KB Flash program memory (8K x 16 words), 768 bytes SRAM, 256 bytes EEPROM, 22 I/O pins, an enhanced Capture/Compare/PWM module with up to 4 PWM channels and configurable resolution up to 14 bits, a 10-bit multi-channel A/D converter, two analog comparators, USART, MSSP (SPI/I2C), and nanoWatt Technology with multiple idle/sleep modes for sub-µA standby current. The high-performance PWM block includes programmable dead-time control, center-aligned or edge-aligned modes, and dedicated fault input pins for safe motor commutation.
The device is built on a CMOS process with a 16-bit instruction word and 8-bit data path, executing most instructions in one cycle (100 ns at 40 MHz oscillator). The high-endurance Flash supports 100K erase/write cycles typical, and EEPROM supports 1M cycles. This combination of deterministic execution, integrated motor-control peripherals, and wide voltage range makes the PIC18LF2431 well-suited for closed-loop BLDC, PMSM, and brushed-DC control as well as lighting ballasts and switched-mode power supplies.
Typical applications include brushless DC (BLDC) motor control, switched-mode power supplies (SMPS), uninterruptible power supplies (UPS), HVAC fan/blower control, ceiling fans and pumps, LED lighting ballasts, and industrial drives that require high-resolution PWM and ADC feedback in a compact footprint.
When designing with this part, choose the 'LF' variant (2.0 V to 5.5 V) for USB or battery-powered operation, or the standard PIC18F2431 (4.2 V to 5.5 V) for fixed 5 V industrial rails. Provide a clean VDD decoupling network (10 µF + 100 nF), respect the exposed-pad (EP) thermal/ground connection, and verify that the chosen oscillator mode and PLL configuration stay within the 40 MHz maximum operating frequency.
This page synthesizes distributor pricing, drop-in same-family alternatives (PIC18LF2331-I/MM, PIC18F2431-I/MM), parametric comparison, and practical design notes not found in the bare datasheet, giving procurement and engineering teams an actionable single-source reference.
Drop-in-Alternativen für PIC18LF2431-I/MM – 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 PIC18LF2431-I/MM (gleiche Bauform und Footprint) – abweichend in Package, Operating Temperature, Core Architecture, Mounting Type, Timers.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
PIC18LF2331-I/MM
✅ Drop-In✓ Auf Lager
$3.49 / Stück
Datenblatt ansehen →PIC18F2431-I/MM
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
PIC18LF2331T-I/MM
✅ Drop-In✓ Auf Lager
$3.18 / Stück
Datenblatt ansehen →PIC18LF2431-I/SP
✅ Drop-In✓ Auf Lager
$4.4 / Stück
Datenblatt ansehen →PIC18F2331-I/MM
✅ Drop-In✓ Auf Lager
$3.15 / Stück
Datenblatt ansehen →PIC18LF2431-I/MM Grenzwerte & elektrische Eigenschaften
| Family | PIC PIC® 18F |
| Core | 8-bit RISC (modified Harvard) |
| Program Memory (Flash) | 16 KB (8K x 16) |
| RAM | 768 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Operating Voltage (Vdd) | 2.0 V to 5.5 V |
| I/O Pins | 22 |
| ADC | 10-bit, multi-channel |
| PWM Channels | Up to 4, enhanced 14-bit |
| Analog Comparators | 2 |
| UART/USART | 1 x USART (EUSART) |
| SPI / I2C (MSSP) | 1 x MSSP (SPI / I2C) |
| Timers | 8-bit and 16-bit (multiple) |
| Gehäuse | 28-pin QFN-S (6x6 mm) with EP |
| Montageart | Surface Mount (no-lead) |
| Betriebstemperatur | -40°C to +85°C (Industrial) |
| RoHS / Lead-Free | Yes (lead-free QFN) |
| Instruction Set | 77 single-word instructions |
PIC18LF2431-I/MM Pin-Konfiguration
| Pin 1 | MCLR — Reset input (active low); external 10 kΩ pull-up to Vdd |
| Pin 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / ADC Vref- |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC Vref+ |
| Pin 6 | RA4 — PORTA bit 4 (digital only, open-drain) |
| Pin 7 | RA5 — PORTA bit 5 |
| Pin 8 | Vss — Ground reference |
| Pin 9 | OSC1/CLKI — Crystal oscillator input / external clock |
| Pin 10 | OSC2/CLKO — Crystal oscillator output / clock output |
| Pin 11 | RC0/T1OSO — PORTC bit 0 / Timer1 oscillator output |
| Pin 12 | RC1/T1OSI — PORTC bit 1 / Timer1 oscillator input |
| Pin 13 | RC2/CCP1 — PORTC bit 2 / enhanced CCP1 output |
| Pin 14 | RC3 — PORTC bit 3 |
| Pin 15 | RC4 — PORTC bit 4 |
| Pin 16 | RC5 — PORTC bit 5 |
| Pin 17 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Pin 18 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Pin 19 | Vss — Ground reference |
| Pin 20 | Vdd — Positive supply (2.0 V to 5.5 V) |
| Pin 21 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Pin 22 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Pin 23 | RB2 — PORTB bit 2 |
| Pin 24 | RB3 — PORTB bit 3 |
| Pin 25 | RB4 — PORTB bit 4 |
| Pin 26 | RB5 — PORTB bit 5 |
| Pin 27 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 28 | RB7/PGD — PORTB bit 7 / ICSP data |
Typische Anwendungen
PIC18LF2431-I/MM ist geeignet für 6 Anwendungs: Brushless DC (BLDC) Motor Control, Switched-Mode Power Supplies (SMPS), HVAC Fan and Blower Control, Ceiling Fans and Pumps, LED Lighting Ballasts, Uninterruptible Power Supplies (UPS).
Brushless DC (BLDC) Motor Control
The PIC18LF2431-I/MM is purpose-built for closed-loop BLDC and PMSM motor control. Its enhanced Capture/Compare/PWM (ECCP) module provides up to 4 PWM channels with 14-bit resolution, programmable dead-time control, center- or edge-aligned modes, and dedicated PWM fault input pins that disable outputs in microseconds - a hard requirement for safe motor commutation. The 10-bit multi-channel ADC samples back-EMF or phase current synchronously to the PWM, while two on-chip analog comparators support hardware overcurrent protection. Running at 40 MHz (10 MIPS) the core executes PI/sensorless-control loops well under 100 µs. The wide 2.0-5.5 V Vdd range allows USB-powered development rigs and 3.3 V logic integration. Source: PIC18F2331/2431 datasheet (Microchip DS39616).
Empfohlen
Switched-Mode Power Supplies (SMPS)
The PIC18LF2431-I/MM is widely used as the control brain in digitally controlled SMPS. The high-speed 10-bit ADC samples the output voltage and current sense signals at sub-microsecond rates, while the 14-bit ECCP PWM drives the main power MOSFET at deterministic frequencies up to 1 MHz. The 40 MHz core (10 MIPS) handles average-current-mode or peak-current-mode control loops in firmware. The 2.0-5.5 V wide-voltage LF process lets the same firmware run on 3.3 V USB or 5 V rails, and nanoWatt modes lower standby consumption for ErP/ENERGY STAR compliance. Use PIC18LF2431 with a TC110/TC107 supervisor and TC642 fan controller for a complete ATX/auxiliary power design.
Empfohlen
HVAC Fan and Blower Control
HVAC fans and blowers demand quiet variable-speed operation, accurate tachometer feedback, and reliable fault handling. The PIC18LF2431-I/MM delivers all three via its enhanced 14-bit PWM for smooth motor commutation, the Input Capture (IC) module for RPM measurement on a Hall sensor or back-EMF, and the dedicated PWM fault pin that latches outputs within one cycle on stall or overcurrent. The LF (2.0-5.5 V) supply range simplifies 24 V → 3.3 V HVAC bus designs, and 16 KB Flash fits typical BLDC + display + diagnostics firmware. Industrial -40 to +85 °C temperature grade supports unconditioned plenum environments.
Empfohlen
Ceiling Fans and Pumps
Ceiling fans and small water pumps are classic PIC18LF2431-I/MM applications. The enhanced PWM provides silent sinusoidal commutation via 6-step or sinusoidal lookup tables, the 10-bit ADC reads potentiometer or IR remote speed settings, and nanoWatt sleep modes keep standby current below typical ENERGY STAR ceilings. The wide Vdd 2.0-5.5 V range supports both capacitive-drop 230 V → 5 V supplies and DC bus designs. The 28-pin QFN-S 6x6 mm package drops onto space-constrained in-motor PCBs.
Empfohlen
LED Lighting Ballasts
High-brightness LED ballasts with dimming benefit from the PIC18LF2431-I/MM combination of high-resolution PWM and analog comparators. The ECCP module drives constant-current buck/boost stages at programmable frequency with dead-time control; the 10-bit ADC reads photodiode or 0-10 V dimmer inputs; the comparator provides hardware overcurrent protection that shuts down the PWM within one cycle, protecting the LED string. The 2.0-5.5 V Vdd range integrates with universal AC-DC converters outputting 3.3 V or 5 V aux rails. Use PIC18LF2431 in conjunction with a CL8801 LED driver for high-end dim-to-warm designs.
Empfohlen
Uninterruptible Power Supplies (UPS)
Low-power line-interactive UPS and DC micro-UPS designs use the PIC18LF2431-I/MM as the supervisory controller. The 40 MHz core executes RMS line-voltage and current calculations in firmware, the 10-bit ADC samples the line and battery sense resistors, and the ECCP PWM drives the transfer relay or the inverter MOSFET bridge. The 2.0-5.5 V Vdd range supports battery-direct operation from a single Li-ion cell or a 3.6 V LiFePO4 pack. The 28-pin QFN-S footprint keeps the BOM small in compact desktop UPS units. Source: Microchip PIC18F2331/2431 datasheet DS39616.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für PIC18LF2431-I/MM – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | PIC18LF2331-I/MM | PIC18F2431-I/MM | PIC18LF2331T-I/MM | PIC18LF2431-I/SP | PIC18F2331-I/MM |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-pin QFN-S (6x6 mm) with EP | 28-pin QFN-S (6x6 mm) with EP - same | 28-pin QFN-S (6x6 mm) with EP - same | 28-pin QFN-S (6x6 mm) with EP - same | 28-pin SPDIP (0.3 inch) - through-hole | 28-pin QFN-S (6x6 mm) with EP - same |
| Program Memory | 16 KB Flash | 8 KB Flash | 16 KB Flash | 8 KB Flash | 16 KB Flash | 8 KB Flash |
| Operating Voltage (Vdd) | 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 | 4.2 V to 5.5 V |
| Maximum CPU Speed | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) |
| I/O Pins | 22 | 22 | 22 | 22 | 22 | 22 |
| Enhanced PWM (ECCP) | Yes (14-bit, 4 channels) | Yes (14-bit, 4 channels) | Yes (14-bit, 4 channels) | Yes (14-bit, 4 channels) | Yes (14-bit, 4 channels) | Yes (14-bit, 4 channels) |
| AEC-Q100 Automotive Qualified | No (Industrial grade only) | No | No | No | No | No |
Wichtigste Unterscheidungsmerkmale
- Higher Flash density within same PIC18F motor-control family (vs. PIC18LF2331-I/MM)
- Wide 2.0 V to 5.5 V Vdd range supports battery and USB operation (vs. PIC18F2431-I/MM)
- Compact 6x6 mm QFN-S 28-pin footprint for space-constrained motor drives (vs. PIC18LF2431-I/SP)
Designhinweise
Provide a low-inductance Vdd/Vss decoupling network on the PIC18LF2431-I/MM: a 10 µF bulk + 100 nF ceramic placed within 5 mm of the Vdd pins. The QFN-S package has multiple ground pads; route them to a continuous ground plane to minimize switching-noise coupling into the ADC. The 2.0-5.5 V wide-voltage range requires careful analog-circuit design below 3.0 V where LDO dropout and ADC LSB size both shrink. Source: Microchip PIC18F2331/2431 datasheet DS39616, 'Oscillator Configuration' and 'Power Management' sections.
The 28-pin QFN-S exposed pad (EP) is the package's primary thermal and electrical ground path. The EP MUST be soldered to a copper pad that is connected to Vss with multiple thermal vias to the inner ground plane. Insufficient EP soldering raises the junction temperature by tens of °C and can cause intermittent communication failures with the ICSP debugger. Keep high-current switching traces (PWM outputs, gate drivers) at least 3 mm from the ADC analog inputs to minimize digital-to-analog coupling.
Estimated: at 40 MHz and 5.0 V, the PIC18LF2431 draws ~16 mA core current (from datasheet DC characteristics); below 3.0 V, drop in clock frequency below 4 MHz to stay within spec. Do NOT toggle PWM outputs faster than 1 MHz without verifying ECCP resolution headroom. Do NOT float MCLR - always provide a 10 kΩ pull-up or the device may randomly reset in noisy environments. When migrating from LF2431 to F2431, ensure your minimum Vdd never drops below 4.2 V; below that the F variant has unspecified behavior. Source: PIC18F2331/2431 datasheet DS39616.
Compliance-Informationen
RoHS compliant and lead-free per Microchip product page. Industrial temperature grade (-40 to +85 °C); not AEC-Q100 qualified - choose PIC18F or PIC18LF automotive-grade variants for automotive applications. Halogen-free per Microchip environmental compliance documentation.
