PIC18F4439-I/ML - 8-Bit 40MHz 12KB Flash MCU | Microchip
MPN: PIC18F4439-I/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.78 | $6.78 |
| 10 | $6.1 | $61.00 |
| 100 | $5.42 | $542.00 |
| 500 | $4.85 | $2,425.00 |
| 1,000 | $4.42 | $4,420.00 |
PIC18F4439-I/ML Overview
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, common in cost-sensitive embedded designs. The PIC18F family sits in the hierarchy of microcontrollers -> 8-bit MCUs -> PIC microcontrollers -> PIC18F -> motor-control PIC18F. Flash program memory allows field re-programming, while on-chip EEPROM supports non-volatile parameter storage - a common requirement for motor-drive calibration constants, fault logs, and runtime trim values.
Key features include 32 general-purpose I/O pins, four timer modules, two Capture/Compare/PWM (CCP) peripherals plus an Enhanced CCP (ECCP) module with auto-shutdown and dead-band control, a USART with LIN support, and an I2C/SPI master-slave port. The motor-control PWM block delivers up to 14-bit resolution with independent fault inputs and programmable dead time, supporting center-aligned, edge-aligned, and push-pull modes commonly required by single-phase induction motor drive stages.
Typical applications include single-phase induction motor drives (PMSM/ACIM fans, pumps, and small appliances), variable-frequency washing-machine controllers, BLDC and PMSM sensorless trapezoidal drives, and small appliance inverter platforms. The industrial (-40C to +85C) operating range, on-chip op-amps for current sensing, and integrated 10-bit ADC simplify the analog front-end around the power stage.
When designing, allocate board area for the exposed pad thermal via array directly under the package to keep junction temperature in spec at sustained 40 MHz operation. Use the ICD 3 / ICD 5 / PICkit 4 debuggers with the standard ICSP six-pin header; firmware development is supported by MPLAB X IDE, MCC code generator, and the MPLAB XC8 compiler.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single reference point for selection, sourcing, and PCB integration.
Drop-in alternatives for PIC18F4439-I/ML — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC18F4439-I/ML (same form factor and footprint) — differing in Package, ADC, I/O Pins, Communication, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F4439-E/ML
✅ Drop-In✓ In Stock
$5.25 / Unit
View Datasheet →PIC18F4431-I/ML
✅ Drop-In✓ In Stock
$4.85 / Unit
View Datasheet →PIC18F442-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4520-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4580-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4410-I/ML
✅ Drop-In✓ In Stock
$4.36 / Unit
View Datasheet →PIC18F4439-I/ML Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit |
| Core Series | PIC18F |
| CPU Frequency | 40 MHz |
| Program Memory (Flash) | 12 KB (6K x 16) |
| Data SRAM | 640 bytes |
| Data EEPROM | 256 bytes |
| I/O Pins | 32 |
| ADC | 10-bit, 8 channels |
| PWM Channels | Up to 6 channels (motor-control PWM) |
| Timers | 4 (Timer0/1/2/3) |
| CCP / ECCP Modules | 2 CCP + 1 ECCP |
| Communication | USART (LIN-capable), I2C, SPI |
| Package | 44-VQFN (8x8 mm) Exposed Pad |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (Industrial) |
| RoHS Status | Compliant |
PIC18F4439-I/ML Pin Configuration
| Pin 1 | MCLR/RE3 — Master Clear (Reset) input or digital input RE3 |
| 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/AN4 — PORTA bit 4 / analog input 4 |
| Pin 7 | RA5/AN5 — PORTA bit 5 / analog input 5 |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKIN — Crystal oscillator input or external clock |
| Pin 10 | OSC2/CLKOUT — Crystal oscillator output or clock out |
| Pin 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock |
| Pin 12 | RC1/T1OSI — PORTC bit 1 / Timer1 oscillator input |
| Pin 13 | RC2/CCP1 — PORTC bit 2 / 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 / I2C clock |
| Pin 18 | RC7/RX/DT — PORTC bit 7 / USART RX / I2C data |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage |
| Pin 21 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Pin 22 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Pin 23 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Pin 24 | RB3/CCP2 — PORTB bit 3 / CCP2 output |
| 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 |
| Pin 29 | VSS — Ground reference |
| Pin 30 | VDD — Positive supply voltage |
| Pin 31 | RD0/PSP0 — PORTD bit 0 / parallel slave port data |
| Pin 32 | RD1/PSP1 — PORTD bit 1 / parallel slave port data |
| Pin 33 | RD2/PSP2 — PORTD bit 2 / parallel slave port data |
| Pin 34 | RD3/PSP3 — PORTD bit 3 / parallel slave port data |
| Pin 35 | RD4/PSP4 — PORTD bit 4 / parallel slave port data |
| Pin 36 | RD5/PSP5 — PORTD bit 5 / parallel slave port data |
| Pin 37 | RD6/PSP6 — PORTD bit 6 / parallel slave port data |
| Pin 38 | RD7/PSP7 — PORTD bit 7 / parallel slave port data |
| Pin 39 | VSS — Ground reference |
| Pin 40 | VDD — Positive supply voltage |
| Pin 41 | RE0/RD — PORTE bit 0 / parallel slave port read |
| Pin 42 | RE1/WR — PORTE bit 1 / parallel slave port write |
| Pin 43 | RE2/CS — PORTE bit 2 / parallel slave port chip select |
| Pin 44 | NC — Not connected (per datasheet package outline) |
Typical Applications
PIC18F4439-I/ML is suitable for 6 applications: Single-Phase Induction Motor Drive, Variable-Frequency Washing Machine Controller, BLDC / PMSM Sensorless Drive, Small Appliance Inverter Platform, Industrial Fan and Pump Controller, Home Appliance User Interface Controller.
Single-Phase Induction Motor Drive
The PIC18F4439-I/ML is purpose-built for single-phase induction motor (ACIM) control in white goods and small appliances, integrating a dedicated motor-control PWM kernel with up to 14-bit resolution, programmable dead-band control, and hardware fault inputs. Its on-chip 10-bit ADC samples phase current while the 32-bit position counter and ECCP module handle timing-critical commutation without CPU intervention, freeing the 8-bit core for V/f profile generation. A typical fan or pump drive uses the device at 40 MHz with the internal oscillator to eliminate an external crystal, achieving BOM savings while still meeting start-up torque and reverse-rotation requirements.
Recommended
Variable-Frequency Washing Machine Controller
Front-load washing machines use variable-frequency drives to spin the drum at different speeds for wash, rinse, and spin cycles, and the PIC18F4439-I/ML is a fit for the main control board. Its 12 KB Flash holds the speed-profile state machine plus fault diagnostics, while 640 bytes of SRAM buffer ADC readings from motor current and line voltage. The motor-control PWM module drives the IGBT inverter at switching frequencies up to 20 kHz with dead-band inserted in hardware, reducing EMI compared to firmware-only PWM generation. Industrial temperature grade (-40C to +85C) covers the hot environment near the motor housing.
Recommended
BLDC / PMSM Sensorless Drive
While the PIC18F4439-I/ML is optimized for single-phase ACIM, the same motor-control PWM peripheral drives small BLDC and PMSM loads in sensorless trapezoidal mode. The 10-bit ADC samples BEMF voltage on the undriven phase to detect zero-crossing, and the on-chip comparators trip the commutation event without software latency. At 40 MHz (10 MIPS) the core closes the loop in under 10 microseconds per commutation cycle, supporting speeds up to ~30,000 RPM on a 2-pole BLDC. Designers moving to sinusoidal FOC typically migrate to a dsPIC33 or PIC18F46K22 with higher ADC speed.
Recommended
Small Appliance Inverter Platform
Refrigerator compressors, microwave oven turntables, and small HVAC blowers use inverter control to vary motor speed and reduce power consumption, and the PIC18F4439-I/ML provides the timing backbone. Its enhanced CCP module with auto-shutdown enters a safe state in less than 200 nanoseconds when an over-current fault is detected, protecting the IGBT bridge without firmware delay. The 256-byte EEPROM stores commissioning data such as maximum RPM ramp rate and soft-start duration, allowing the same firmware image to be used across product variants with different mechanical loads.
Recommended
Industrial Fan and Pump Controller
Industrial fans and centrifugal pumps use the PIC18F4439-I/ML to vary motor speed based on temperature, pressure, or flow feedback, reducing energy use by 30-60% compared to fixed-speed operation. The 8-bit PIC core runs the V/f profile while the dedicated motor-control PWM generates the inverter switching pattern with hardware dead-band, eliminating shoot-through events. The integrated USART with LIN support communicates with a master HVAC controller over a single-wire bus, and 256 bytes of EEPROM retain the last operating setpoint through power cycles.
Recommended
Home Appliance User Interface Controller
Although primarily a motor controller, the PIC18F4439-I/ML is also used in lower-end appliances where it consolidates the user-interface logic and motor control in a single chip. Its 32 general-purpose I/O pins drive LED indicators, scan a matrix keypad, and read rotary encoder inputs, while the motor-control PWM block runs the synchronous drum or pump motor. The internal oscillator eliminates an external crystal, cutting BOM cost by approximately USD 0.30 per unit on volume production - significant in cost-sensitive consumer appliance designs.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F4439-I/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F4439-E/ML | PIC18F4431-I/ML | PIC18F442-I/ML | PIC18F4520-I/ML | PIC18F4580-I/ML | PIC18F4410-I/ML |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-VQFN (8x8) ML | 44-VQFN (8x8) ML - same | 44-VQFN (8x8) ML - same | 44-VQFN (8x8) ML - same | 44-VQFN (8x8) ML - same | 44-VQFN (8x8) ML - same | 44-VQFN (8x8) ML - same |
| Program Memory (Flash) | 12 KB | 12 KB | 16 KB | 16 KB | 32 KB | 32 KB | 16 KB |
| Data SRAM | 640 bytes | 640 bytes | 768 bytes | 768 bytes | 1.5 KB | 1.5 KB | 768 bytes |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| CPU Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Motor-Control PWM Kernel | Yes (single-phase optimized) | Yes (single-phase optimized) | No | No | Yes (three-phase) | Yes (three-phase) | Yes (single-phase) |
| Operating Temperature | -40C to +85C | -40C to +125C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Integrated single-phase induction motor-control PWM kernel (vs PIC18F4431-I/ML)
- Extended -40C to +125C temperature range available (vs PIC18F4439-I/ML (this part))
- Compact 8x8 mm VQFN with same silicon as 40-pin TQFP (vs PIC18F4439-I/PT)
Design Notes
The 44-VQFN package exposes its die-attach paddle on the bottom; this pad must be soldered to a copper pour of at least 1 square inch with a thermal via array (typically 9-16 vias at 0.3 mm drill, 0.5 mm pitch) to keep junction temperature in spec at sustained 40 MHz operation. Without the exposed-pad solder connection, theta_JA rises above 60 C/W and the device may thermal-throttle or fail under industrial -40C to +85C ambient loads. Estimated: at 40 MHz with all peripherals active, internal dissipation is approximately 0.25 W, requiring the thermal via array to keep Tj below 100 C in 85 C ambient.
Place a 100 nF decoupling capacitor within 5 mm of every VDD pin (pins 20, 30, 40 in the 44-VQFN) and a 10 uF bulk capacitor near the package. For motor-control applications, isolate the analog AVdd/AVss pin pair (if used) from the digital VDD/VSS traces with a ferrite bead or small inductor to keep switching noise out of the ADC reference. The ICSP six-pin header should be placed at the board edge for debug access, with the PGC and PGD traces no longer than 50 mm to avoid signal-integrity issues during programming.
Do not enable the Enhanced CCP auto-shutdown feature without configuring the FLT0 pin - leaving the fault input floating can cause spurious shutdowns in noisy motor-drive environments. When migrating from PIC18F4431 firmware, the motor-control PWM registers are at different addresses; do not assume register-level compatibility even though the package pinout is identical. The 32-bit position counter requires TMR5/TMR6 as its time base; ensure those timers are configured before reading the position count to avoid garbage data on the first conversion.
Keep the high-current motor drive traces (PWM outputs to the gate driver) away from the analog ADC inputs (AN0-AN7) by at least 5 mm, or use a ground guard ring around the analog traces. The exposed-pad thermal via array should not be placed under the ICSP header pads to avoid intermittent debug connections during rework. Estimate: with a 4-layer PCB using 1 oz copper on the top/bottom layers and a dedicated ground plane on layer 2, the thermal via array reduces theta_JA from approximately 31 C/W to roughly 18 C/W.
Compliance Information
RoHS compliance per Microchip product page. Industrial (-40C to +85C) temperature grade only - automotive AEC-Q100 variants are not available in this part number; choose PIC18F4439-E/ML for extended temp, or PIC18F-K22 family for AEC-Q100 qualified designs.
