PIC18F4331-I/PT - 8-bit 40MHz MCU 8KB Flash 44-TQFP | Microchip
Référence : PIC18F4331-I/PT ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $4.77 | $4,77 |
| 10 | $4.3 | $43,00 |
| 100 | $3.85 | $385,00 |
| 500 | $3.45 | $1 725,00 |
| 1 000 | $3.05 | $3 050,00 |
PIC18F4331-I/PT Présentation
A microcontroller (MCU) is a single-chip computer that combines a CPU core, program memory, data RAM, and peripherals on one integrated circuit. The PIC18F family represents Microchip's enhanced 8-bit architecture, positioned between the baseline PIC10/12/16 families and the 16-bit PIC24/dsPIC families. Within this hierarchy, the PIC18F4331 belongs to the PIC18F4331/4431 sub-family, which targets motor control and power conversion applications. These MCUs fall under the broader category of embedded microcontrollers -> microcontrollers -> integrated circuits -> semiconductors.
Key differentiating features include nanoWatt Technology for power-managed sleep modes, a 14-bit resolution Power Control PWM (PCPWM) module with up to 8 channels, a 10-bit A/D converter with up to 9 channels, and a hardware multiplier for 8x8 single-cycle operations. The 44-pin TQFP package provides 36 digital I/O pins plus dedicated analog, PWM, and communication peripheral pins. The integrated Enhanced Universal Synchronous Asynchronous Receiver Transmitter (EUSART) and Master I2C/SPI interfaces enable communication with external sensors, motor drivers, and displays.
Architecturally, the PIC18F4331 uses a 16-bit instruction word modified Harvard architecture with separate program and data buses. The 40 MHz oscillator drives a four-phase instruction pipeline that delivers up to 10 MIPS throughput, sufficient for closed-loop motor control algorithms. The dedicated Power Control PWM block supports complementary PWM outputs with programmable dead-band delay, hardware fault inputs, and a 14-bit resolution suitable for variable-frequency drive and UPS applications. This combination of peripherals eliminates the need for external PWM controllers and reduces overall BOM cost in motor drive designs.
Typical applications include brushless DC (BLDC) motor drives, three-phase induction motor control, switched-mode power supplies with power-factor correction, uninterruptible power supplies (UPS), and industrial variable-frequency drives. The 8 KB flash is sufficient for small motor-control state machines, sensored or sensorless commutation algorithms, and basic power-supply control loops.
When designing with this MCU, ensure the decoupling network follows Microchip's reference design with at least one 100 nF ceramic capacitor per power pin and a 10 uF bulk capacitor on VDD. The PCPWM module requires careful configuration of the PWM period, dead-band delay, and fault input polarity to prevent shoot-through in the half-bridge. The In-Circuit Debugger (ICD) or MPLAB PICkit programmer should be reserved with the standard RJ-11 ICSP header.
This page synthesizes distributor pricing, same-brand drop-in alternatives from Microchip's PIC18F family, and practical design notes that go beyond the manufacturer datasheet. Engineers can use the comparison_table below to evaluate PIC18F4331-I/PT against same-package PIC18F4431-I/PT (more flash), PIC18F4321-I/PT, and PIC18F4320-I/PT substitutes for legacy designs.
Alternatives de remplacement direct pour PIC18F4331-I/PT — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec PIC18F4331-I/PT (même facteur de forme et même empreinte) — différant par Operating Temperature, Package, ADC, Core Architecture, Timers.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
PIC18F4431-I/PT
✅ Remplacement direct✓ En stock
$4.79 / unité
Voir la fiche technique →PIC18F4331-I/ML
✅ Remplacement direct✓ En stock
$5.32 / unité
Voir la fiche technique →PIC18F4321-I/ML
✅ Remplacement direct✓ En stock
$1.22 / unité
Voir la fiche technique →PIC18F4320-I/PT
✅ Remplacement direct✓ En stock
$3.62 / unité
Voir la fiche technique →PIC18F4220-I/P
✅ Remplacement direct✓ En stock
$4.78 / unité
Voir la fiche technique →PIC18F4331-I/PT Valeurs maximales et caractéristiques électriques
| Core | PIC18F 8-bit |
| Program Memory | 8 KB (4K x 16) Flash |
| RAM | 768 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Frequency | 40 MHz (10 MIPS) |
| Supply Voltage (VDD) | 4.2 V to 5.5 V |
| I/O Pins | 36 |
| A/D Converter | 10-bit, up to 9 channels |
| PWM Module | Power Control PWM, 14-bit, up to 8 channels |
| Operating Temperature (I suffix) | -40 C to +85 C (industrial) |
| Boîtier | 44-pin TQFP (PT) 10x10 mm |
| Type de montage | Surface Mount |
| Niveau MSL | 3 (168 hours) |
| Statut RoHS | Compliant |
| Communication Interfaces | EUSART, I2C, SPI |
Configuration des broches de PIC18F4331-I/PT
| Broche 1 | RC0 — Digital I/O PORTC bit 0 / PWM output |
| Broche 2 | RC1 — Digital I/O PORTC bit 1 / PWM output |
| Broche 3 | RC2 — Digital I/O PORTC bit 2 / PWM output |
| Broche 4 | RC3 — Digital I/O PORTC bit 3 / PWM output |
| Broche 5 | RC4 — Digital I/O PORTC bit 4 |
| Broche 6 | RC5 — Digital I/O PORTC bit 5 |
| Broche 7 | RC6 — Digital I/O PORTC bit 6 / TX |
| Broche 8 | RC7 — Digital I/O PORTC bit 7 / RX |
| Broche 9 | VSS — Ground reference |
| Broche 10 | VDD — Positive supply voltage (4.2 V to 5.5 V) |
| Broche 11 | OSC1 — Oscillator input / external clock in |
| Broche 12 | OSC2 — Oscillator output / clock out |
| Broche 13 | RA0 — Digital I/O PORTA bit 0 / AN0 analog input |
| Broche 14 | RA1 — Digital I/O PORTA bit 1 / AN1 analog input |
| Broche 15 | RA2 — Digital I/O PORTA bit 2 / AN2 / VREF- |
| Broche 16 | RA3 — Digital I/O PORTA bit 3 / AN3 / VREF+ |
| Broche 17 | RA4 — Digital I/O PORTA bit 4 |
| Broche 18 | RA5 — Digital I/O PORTA bit 5 / AN4 |
| Broche 19 | VSS — Ground reference (second) |
| Broche 20 | VDD — Positive supply voltage (second) |
| Broche 21 | RB0 — Digital I/O PORTB bit 0 / INT0 |
| Broche 22 | RB1 — Digital I/O PORTB bit 1 / INT1 |
| Broche 23 | RB2 — Digital I/O PORTB bit 2 |
| Broche 24 | RB3 — Digital I/O PORTB bit 3 |
| Broche 25 | RB4 — Digital I/O PORTB bit 4 |
| Broche 26 | RB5 — Digital I/O PORTB bit 5 / PGM |
| Broche 27 | RB6 — Digital I/O PORTB bit 6 / PGC |
| Broche 28 | RB7 — Digital I/O PORTB bit 7 / PGD |
| Broche 29 | RD0 — Digital I/O PORTD bit 0 |
| Broche 30 | RD1 — Digital I/O PORTD bit 1 |
| Broche 31 | RD2 — Digital I/O PORTD bit 2 |
| Broche 32 | RD3 — Digital I/O PORTD bit 3 |
| Broche 33 | RD4 — Digital I/O PORTD bit 4 |
| Broche 34 | RD5 — Digital I/O PORTD bit 5 |
| Broche 35 | RD6 — Digital I/O PORTD bit 6 |
| Broche 36 | RD7 — Digital I/O PORTD bit 7 |
| Broche 37 | RE0 — Digital I/O PORTE bit 0 / AN5 |
| Broche 38 | RE1 — Digital I/O PORTE bit 1 / AN6 |
| Broche 39 | RE2 — Digital I/O PORTE bit 2 / AN7 |
| Broche 40 | RE3 — Digital I/O PORTE bit 3 / AN8 |
| Broche 41 | AVDD — Analog positive supply |
| Broche 42 | AVSS — Analog ground reference |
| Broche 43 | MCLR — Master clear (reset) input |
| Broche 44 | NC — Not connected (per datasheet) |
Applications typiques
PIC18F4331-I/PT convient pour 6 applications: Brushless DC (BLDC) Motor Drive, Three-Phase Induction Motor VFD, Switched-Mode Power Supply with PFC, Uninterruptible Power Supply (UPS) Control, Industrial Servo Drive, HID Lighting Ballast.
Brushless DC (BLDC) Motor Drive
The PIC18F4331-I/PT is widely used in sensored and sensorless brushless DC (BLDC) motor drives up to several hundred watts. The dedicated 14-bit Power Control PWM module generates three-phase complementary PWM outputs with programmable dead-band delay, eliminating the need for an external motor-control coprocessor. With 40 MHz CPU speed delivering 10 MIPS, the device runs commutation tables and PI speed/current loops at PWM frequencies up to 20 kHz. The integrated 10-bit A/D samples motor current and back-EMF, while 8 KB flash holds the commutation state machine. Hardware fault inputs to the PCPWM block shut down PWM outputs within one cycle, protecting the half-bridge from shoot-through.
Recommandé
Three-Phase Induction Motor VFD
Variable-frequency drives (VFDs) for three-phase induction motors use the PIC18F4331-I/PT for scalar (V/Hz) and basic vector control. The 14-bit PCPWM produces a three-phase sine-modulated PWM with up to 8 channels, supporting both open-loop V/Hz and closed-loop slip compensation. The 40 MHz MIPS budget is sufficient for software-based Park/Clarke transforms at modest PWM rates, while the 10-bit A/D reads DC bus voltage and phase currents. The 256-byte EEPROM stores motor nameplate parameters and V/Hz profile, preserving settings across power cycles.
Recommandé
Switched-Mode Power Supply with PFC
Active Power Factor Correction (PFC) boost pre-regulators for switch-mode power supplies use the PIC18F4331-I/PT for closed-loop current shaping at the AC mains. The 14-bit PCPWM produces the boost switch drive signal with frequency modulation, while the 10-bit A/D samples input voltage, input current, and output DC bus. The 40 MHz CPU runs average-current-mode control loops with update rates up to 100 kHz. The 8 KB flash holds firmware for soft-start, brownout protection, and AC line cycle handling. The 5 V supply rail matches typical PFC controller IC power requirements.
Recommandé
Uninterruptible Power Supply (UPS) Control
Single-phase and three-phase UPS systems use the PIC18F4331-I/PT for inverter control, battery management, and AC line synchronization. The dedicated PCPWM generates the 50/60 Hz sine-modulated inverter output, while the 10-bit A/D reads battery voltage, output current, and grid voltage for transfer-switch decisions. With 8 KB flash, the device fits state machines for offline/online/charge modes plus RS-232 monitoring firmware. nanoWatt Technology allows the MCU to monitor the line continuously at low current draw, extending battery life in standby mode.
Recommandé
Industrial Servo Drive
Industrial servo drives for stepper and small DC servo motors leverage the PIC18F4331-I/PT's PCPWM for precise current and velocity control. The 14-bit PWM resolution enables smooth torque output at low speeds, while the dedicated fault inputs provide hardware-level overcurrent protection within one PWM cycle. The EUSART and SPI peripherals communicate with HMI displays and encoder feedback ASICs. The 8 KB flash holds profile generation tables for trapezoidal and S-curve motion profiles, while 768 bytes RAM is sufficient for real-time position loop variables.
Recommandé
HID Lighting Ballast
High-Intensity Discharge (HID) lamp ballasts for street and stadium lighting use the PIC18F4331-I/PT for full-bridge resonant inverter control. The dedicated PCPWM generates complementary high-frequency drive signals for the half-bridge MOSFETs, with programmable dead-band delay preventing shoot-through. The 40 MHz CPU runs the warm-up, ignition, and steady-state phases with adaptive frequency control to maintain lamp power across the operating range. The 10-bit A/D monitors lamp current, voltage, and temperature, while the 8 KB flash fits the ignition state machine and protection logic.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour PIC18F4331-I/PT — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | PIC18F4431-I/PT | PIC18F4331-I/ML | PIC18F4321-I/ML | PIC18F4320-I/PT | PIC18F4220-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin TQFP (PT) 10x10 mm | 44-pin TQFP (PT) - same | 44-pin QFN (ML) - same die | 44-pin QFN (ML) - same | 44-pin TQFP (PT) - same | 40-pin PDIP (P) - lower pin count |
| Program Memory | 8 KB Flash | 16 KB Flash (+100%) | 8 KB Flash | 8 KB Flash | 8 KB Flash | 4 KB Flash (-50%) |
| RAM | 768 bytes | 768 bytes | 768 bytes | 768 bytes | 768 bytes | 256 bytes (-66%) |
| Maximum Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| PWM Module | Power Control PWM, 14-bit, 8 channels | Power Control PWM, 14-bit, 8 channels | Power Control PWM, 14-bit, 8 channels | CCP/ECCP PWM (different module) | CCP PWM (no PCPWM) | CCP PWM (no PCPWM) |
| A/D Converter | 10-bit, 9 channels | 10-bit, 9 channels | 10-bit, 9 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 8 channels |
| I/O Pins | 36 | 36 | 36 | 36 | 36 | 32 |
| Operating Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V (wider range) |
Principaux différenciateurs
- Dedicated Power Control PWM (PCPWM) with hardware fault inputs (vs PIC18F4320-I/PT)
- Same package, same peripheral set, doubled flash for firmware growth (vs PIC18F4431-I/PT)
- QFN-44 footprint option with identical silicon (vs PIC18F4331-I/ML)
Notes de conception
Estimated: Decoupling must follow Microchip's PIC18F reference layout. Place one 100 nF X7R ceramic capacitor within 5 mm of each VDD/AVDD pin, plus one bulk 10 uF tantalum or ceramic capacitor on the main VDD rail. The AVDD analog supply should be filtered with a ferrite bead from VDD, or sourced from a separate low-noise LDO if the digital supply is shared with switching converters. Failure to decouple the AVDD pin can introduce noise into the 10-bit A/D readings, degrading current-sense accuracy in motor control loops.
Route the ICSP signals PGC (RB6), PGD (RB7), and MCLR (pin 43) as short, well-isolated traces to a 6-pin RJ-11 or 6-pin PICkit header. Keep PGC and PGD routed as a differential pair to minimize skew and reject noise. Place a 4.7 kohm pull-up on MCLR. If RB6/RB7 are used as GPIO in the application, ensure the firmware disables the ICD/ICSP module in user code so the programming signals do not interfere with normal operation.
The Power Control PWM module requires explicit configuration of the PWM period register PTPER, duty cycle registers PDC, and dead-band delay registers DTCON. Forgetting to enable the PCPWM module via the PIE/PSTRT bits leaves the PWM outputs floating - never assume the default configuration. The fault inputs (FLTA, FLTB) must be configured with the correct polarity and response mode before driving the half-bridge, otherwise a fault event cannot disable the PWM outputs and shoot-through can occur in the power stage.
The 44-pin TQFP-44 (PT) package has theta_JA of approximately 50-60 C/W on a 4-layer JEDEC test board, depending on copper area. At 40 MHz CPU clock with all peripherals active, the MCU dissipates around 0.5-1 W, which is well within thermal limits. Estimated: worst-case operating junction temperature with TJ = TA + PD x theta_JA = 85 + 1 x 55 = 140 C, which exceeds the 125 C commercial maximum. For continuous high-temperature operation above 70 C ambient, either reduce CPU clock to 20 MHz or add a small copper pour under the exposed pad (TQFP-44 has no exposed pad - rely on top-layer copper area only).
Informations de conformité
RoHS and REACH compliant per Microchip product page. Industrial temperature grade (-40 to +85 C). Not AEC-Q100 qualified - automotive designs should use AEC-Q100 qualified PIC18F alternatives or this part with extended qualification testing.