PIC18F4439-E/ML - 8-bit MCU, 12KB Flash, 40MHz, Motor Control | Microchip
MPN: PIC18F4439-E/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.2 | $8.20 |
| 10 | $7.38 | $73.80 |
| 100 | $6.55 | $655.00 |
| 500 | $5.9 | $2,950.00 |
| 1,000 | $5.25 | $5,250.00 |
PIC18F4439-E/ML Overview
What is a PIC18F microcontroller? The PIC18F is Microchip's high-performance 8-bit RISC architecture, positioned in the product hierarchy as: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. It uses a 16-bit instruction word with Harvard bus architecture and adds enhanced peripherals (CAN, USB, Ethernet, motor-control PWM) over the baseline PIC16F family, while remaining fully code-compatible with PIC16F legacy code in most cases.
Key features include the dedicated single-phase induction motor control kernel (Motion Feedback Module, 14-bit Power Control PWM with up to 6 outputs, and quadrature encoder interface), which offloads commutation and PFC control from the CPU. The 10-bit ADC supports up to 13 input channels with auto-acquisition, while nanoWatt Technology provides multiple idle/sleep modes with currents below 1 microamp. The 44-QFN package offers a compact 8 mm x 8 mm footprint with an exposed thermal pad, suitable for space-constrained motor drive PCBs.
The device uses Microchip's enhanced Harvard architecture with a hardware multiplier and 32-level hardware stack. Flash memory supports self-programmability under firmware control (ICSP) and the device retains data in EEPROM over the full automotive temperature range, making it suitable for field-retrofittable motor inverters.
Typical applications include single-phase induction motor drives (HVAC fans, washer pumps, refrigerator compressors), industrial motor control, sensor-less fan/blower controllers, and white-goods inverter boards. The 14-bit PWM resolution is sufficient for sinewave commutation at line frequencies up to 60 Hz, while the automotive temperature grade allows use in under-hood and outdoor enclosures.
When designing with this part, dedicate a contiguous 4-layer ground pour beneath the QFN pad to meet the 32 C/W theta-JA thermal budget at full 40 MHz operation. Add a 0.1 microfarad decoupling capacitor at every VDD/VSS pair within 2 mm of the pin and route the 14-bit PWM outputs away from analog ADC inputs to minimise switching coupling.
This page synthesises distributor pricing, drop-in alternative MPNs from the same PIC18F motor-control family, and practical design notes that supplement - but do not replace - the manufacturer datasheet.
Drop-in alternatives for PIC18F4439-E/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-E/ML (same form factor and footprint) — differing in Operating Temperature, Package, ADC, I/O Pins, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F4439-I/ML
✅ Drop-In✓ In Stock
$4.42 / Unit
View Datasheet →PIC18F4431-I/ML
✅ Drop-In✓ In Stock
$4.85 / Unit
View Datasheet →PIC18F4331-I/ML
✅ Drop-In✓ In Stock
$5.32 / Unit
View Datasheet →PIC18F4420-E/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4423-E/ML
✅ Drop-In✓ In Stock
$2.85 / Unit
View Datasheet →PIC18F43K22-I/ML
✅ Drop-In✓ In Stock
$1.95 / Unit
View Datasheet →PIC18F4439-E/ML Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit RISC Microcontroller (PIC18F family) |
| Program Memory (Flash) | 12 KB |
| Data SRAM | 640 bytes |
| Data EEPROM | 256 bytes |
| CPU Speed | 40 MHz (10 MIPS) |
| Supply Voltage (Vdd) | 4.2 V to 5.5 V |
| I/O Pins | 36 |
| ADC | 10-bit, up to 13 channels |
| PWM | 14-bit Power Control PWM, up to 6 outputs |
| Motor Control Peripherals | Single-phase induction motor kernel, MFM, QEI |
| Communication | UART, SPI, I2C, CAN (per datasheet) |
| Package | 44-pin QFN (ML) 8x8 mm with exposed thermal pad |
| Operating Temperature | -40 C to +125 C (automotive / -E grade) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC18F4439-E/ML Pin Configuration
| Pin 1 | RC0 — Digital I/O / PWM1 output |
| Pin 2 | RC1 — Digital I/O / PWM2 output |
| Pin 3 | RC2 — Digital I/O / PWM3 output |
| Pin 4 | RC3 — Digital I/O / PWM4 output |
| Pin 5 | RC4 — Digital I/O / PWM5 output |
| Pin 6 | RC5 — Digital I/O / PWM6 output |
| Pin 7 | RC6 — Digital I/O / TX (UART) |
| Pin 8 | RC7 — Digital I/O / RX (UART) |
| Pin 9 | RD0 — Digital I/O / QEI input |
| Pin 10 | RD1 — Digital I/O / QEI input |
| Pin 11 | RD2 — Digital I/O |
| Pin 12 | RD3 — Digital I/O |
| Pin 13 | RD4 — Digital I/O |
| Pin 14 | RD5 — Digital I/O |
| Pin 15 | RD6 — Digital I/O |
| Pin 16 | RD7 — Digital I/O |
| Pin 17 | VSS — Ground reference |
| Pin 18 | VDD — Positive supply (4.2-5.5 V) |
| Pin 19 | RA0 — Digital I/O / AN0 (ADC input) |
| Pin 20 | RA1 — Digital I/O / AN1 (ADC input) |
| Pin 21 | RA2 — Digital I/O / AN2 (ADC input) |
| Pin 22 | RA3 — Digital I/O / AN3 (ADC input) |
| Pin 23 | RA4 — Digital I/O / T0CKI |
| Pin 24 | RA5 — Digital I/O / AN4 (ADC input) |
| Pin 25 | RE0 — Digital I/O / AN5 (ADC input) |
| Pin 26 | RE1 — Digital I/O / AN6 (ADC input) |
| Pin 27 | RE2 — Digital I/O / AN7 (ADC input) |
| Pin 28 | RE3 — Digital I/O |
| Pin 29 | AVDD — Analog positive supply |
| Pin 30 | AVSS — Analog ground |
| Pin 31 | OSC1 — Crystal oscillator input |
| Pin 32 | OSC2 — Crystal oscillator output |
| Pin 33 | RB0 — Digital I/O / INT0 |
| Pin 34 | RB1 — Digital I/O / INT1 |
| Pin 35 | RB2 — Digital I/O |
| Pin 36 | RB3 — Digital I/O |
| Pin 37 | RB4 — Digital I/O |
| Pin 38 | RB5 — Digital I/O |
| Pin 39 | RB6 — Digital I/O / ICSP clock |
| Pin 40 | RB7 — Digital I/O / ICSP data |
| Pin 41 | MCLR — Master clear reset (active low) |
| Pin 42 | VSS — Ground reference |
| Pin 43 | VDD — Positive supply (4.2-5.5 V) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC18F4439-E/ML is suitable for 6 applications: Single-Phase Induction Motor Drive, HVAC Fan and Blower Controller, White-Goods Compressor Inverter, Industrial Pump and Valve Actuator, Automotive Fuel and Water Pump Controller, Sensor-Less Blower and Small Motor Drive.
Single-Phase Induction Motor Drive
The PIC18F4439-E/ML is purpose-built for single-phase induction motor control thanks to its integrated Motion Feedback Module, 14-bit Power Control PWM with up to 6 outputs, and Quadrature Encoder Interface. In a typical fan or compressor drive the IC replaces the discrete commutation logic with on-chip hardware, reducing BOM by 30-50% and freeing CPU MIPS for PFC and protection. The 12 KB Flash accommodates vector-control lookup tables, while the 10-bit ADC samples back-EMF at the required 16 kHz PWM rate. The -E automotive temperature grade (-40 C to +125 C) supports under-hood and outdoor enclosures, and the 44-QFN (ML) footprint leaves room for a heatsink pad on the PCB.
Recommended
HVAC Fan and Blower Controller
HVAC blowers demand smooth torque across varying line frequencies, and the PIC18F4439-E/ML handles this with its 14-bit PWM (sub-1 Hz resolution at 60 Hz line) and dedicated single-phase motor kernel. The IC reads AC-line zero-cross via an interrupt, schedules PWM edges through the Power Control PWM module, and applies anti-aliasing filtering inside the Motion Feedback Module before feeding the ADC. The 4.2-5.5 V supply accepts a small offline switcher pre-regulator, while the 36 I/O pins drive triac gates, relay coils, and tachometer feedback. Its nanoWatt Technology idle modes drop the IC below 1 microamp in standby, satisfying ENERGY STAR quiescent-power budgets for residential HVAC equipment.
Recommended
White-Goods Compressor Inverter
Refrigerator and washing-machine compressors use single-phase induction motors with strict efficiency and acoustic-noise targets, both of which the PIC18F4439-E/ML addresses through its dedicated kernel. The hardware-accelerated commutation runs at 20 kHz PWM to push switching noise above the audible band, while the MFM computes slip frequency in real time for maximum torque per ampere. The 12 KB Flash stores the entire IEC 60730 Class B safety library plus the application state machine, eliminating the need for a companion supervisor MCU. With 640 bytes of SRAM and 256 bytes of EEPROM, the part retains calibration and fault logs across power cycles for warranty diagnostics.
Recommended
Industrial Pump and Valve Actuator
Industrial pump controllers benefit from the PIC18F4439-E/ML's automotive-grade temperature range and integrated motor-control peripherals. The 14-bit PWM drives proportional solenoid valves with 0.5% resolution, while the QEI decodes rotary shaft encoders for closed-loop flow control. The on-chip 10-bit ADC samples 4-20 mA pressure transducers and thermistor inputs concurrently through the auto-acquisition sequencer, removing the need for an external analog MUX. RS-485 UART support (via external transceiver) connects the actuator to a Modbus master, and the 44-QFN package's exposed pad dissipates up to 1 W in fan-cooled control cabinets per the 32 C/W thermal resistance specification.
Recommended
Automotive Fuel and Water Pump Controller
Under-hood automotive pumps (fuel, water, oil) operate at -40 C to +125 C ambient, matching the PIC18F4439-E/ML's -E grade rating. The integrated single-phase motor kernel handles brushless-DC or induction pump commutation without an external DSP, while the CAN-ready peripheral set (per datasheet) interfaces with the vehicle bus for diagnostics. The 36 I/O pins accept up to 13 ADC channels for inlet/outlet pressure and temperature feedback. The 12 KB Flash is sufficient for UDS diagnostic stacks and limp-home routines, while the 256-byte EEPROM retains learned adaptation parameters across battery disconnects per automotive EMC requirements.
Recommended
Sensor-Less Blower and Small Motor Drive
For cost-sensitive sensor-less blower applications the PIC18F4439-E/ML eliminates the Hall-effect sensor and replaces it with back-EMF sampling through the on-chip 10-bit ADC. The Motion Feedback Module computes the rotor position in real time from BEMF zero-crossings, enabling closed-loop torque control without a position sensor. This reduces wiring harness cost and improves reliability in dusty environments where Hall sensors would fail. The 14-bit PWM operates at 25 kHz above the audible band, and nanoWatt Technology drops standby power below 1 microamp when the blower is off, satisfying ENERGY STAR and EU ecodesign directives.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F4439-E/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F4439-I/ML | PIC18F4431-I/ML | PIC18F4331-I/ML | PIC18F4420-E/ML | PIC18F4423-E/ML | PIC18F43K22-I/ML |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-QFN (ML) | 44-QFN (ML) - same | 44-QFN (ML) - same | 44-QFN (ML) - same | 44-QFN (ML) - same | 44-QFN (ML) - same | 44-QFN (ML) - same |
| Program Memory (Flash) | 12 KB | 12 KB | 16 KB | 8 KB | 16 KB | 16 KB | 8 KB |
| Data SRAM | 640 bytes | 640 bytes | 768 bytes | 512 bytes | 768 bytes | 768 bytes | 512 bytes |
| 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 | 64 MHz / 16 MIPS |
| ADC Resolution | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 9 channels | 10-bit, 13 channels | 12-bit, 13 channels | 12-bit, 19 channels |
| Motor Control Kernel | Single-phase induction + MFM + QEI | Single-phase induction + MFM + QEI | Single-phase induction + MFM + QEI | Single-phase (scaled) | None (general-purpose CCP/PWM) | None (general-purpose CCP/PWM) | None (K-series CCP/PWM) |
| Temperature Grade | -40 C to +125 C (Automotive / -E) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +125 C (Automotive / -E) | -40 C to +125 C (Automotive / -E) | -40 C to +85 C (Industrial) |
| Supply 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 | 4.2 V to 5.5 V | 2.3 V to 5.5 V (K-series wide range) |
Key Differentiators
- Integrated single-phase induction motor kernel (vs PIC18F4420-E/ML)
- Larger Flash than the 4331 sibling (vs PIC18F4331-I/ML)
- Automotive temperature grade in the same QFN (vs PIC18F4439-I/ML)
Design Notes
Estimated: at 40 MHz CPU and full 36 I/O switching into capacitive loads, the PIC18F4439-E/ML dissipates approximately 0.4 W. With the 44-QFN exposed pad mounted to a 4-layer 1 oz copper ground pour, theta-JA is approximately 32 C/W, giving a junction temperature rise of about 13 C above ambient. Solder the exposed thermal pad (pin 45) to a continuous ground pour with at least 8 thermal vias (0.3 mm drill) to stay within the -40 C to +125 C automotive junction range. For enclosed designs without airflow, derate CPU clock to 32 MHz.
Place one 0.1 microfarad X7R ceramic decoupling capacitor within 2 mm of every VDD/VSS pair, and a single 10 microfarad bulk tantalum or ceramic cap near the IC's power pin. Route the 14-bit PWM outputs (RC0-RC5) and the QEI inputs (RD0/RD1) on opposite sides of the PCB and never parallel to each other; this avoids capacitive coupling that can corrupt duty cycle accuracy above 100 kHz PWM. Keep the analog AVSS pin tied directly to the ground pour at a single point to avoid digital-return currents in the ADC ground reference.
Do not assume the -E suffix automatically means AEC-Q100 qualified - the PIC18F4439-E/ML is rated to -40 C to +125 C but does not carry full automotive PPAP documentation unless specifically ordered as an -MLVAO or -SP suffix variant. For automotive safety-critical designs consult Microchip's automotive-grade catalog. Also note that firmware written for the 10-bit ADC of the PIC18F4439 cannot run unmodified on the 12-bit ADC of the PIC18F4423; the ADC configuration registers differ and must be migrated in MPLAB X.
Compliance Information
RoHS and lead-free confirmed on the Microchip product page. The -E temperature grade is -40 C to +125 C but does not by itself constitute AEC-Q100 qualification; for AEC-Q100 PPAP documentation review the Microchip automotive product catalog.
