PIC18F4439T-E/ML - 8-bit Motor Control MCU, 12KB Flash, 44-QFN | Microchip
MPN: PIC18F4439T-E/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.5 | $7.50 |
| 10 | $6.8 | $68.00 |
| 100 | $6.1 | $610.00 |
| 500 | $5.45 | $2,725.00 |
| 1,000 | $4.95 | $4,950.00 |
PIC18F4439T-E/ML Overview
A PIC18F microcontroller is an 8-bit Harvard-architecture MCU that combines a RISC-like instruction set with on-chip Flash, EEPROM, RAM, and a rich set of peripherals including timers, ADC, PWM, and communication interfaces. Within the broader taxonomy, PIC18F devices sit between baseline PIC16 parts and the 16-bit dsPIC/PIC24 families, and they belong to the wider category of embedded microcontrollers -> microcontrollers -> standard ICs. Microchip's PIC18F series is widely used for motor control, sensing, and general-purpose embedded designs.
The PIC18F4439 integrates a sophisticated motor-control kernel with dedicated PWM and ADC triggering hardware optimized for single-phase induction motor drives. Key parameters verified from the manufacturer datasheet include 12 KB Flash, 640 bytes RAM, a 44-QFN package, and the -E (extended) temperature grade. The device supports Microchip's ICD in-circuit debugging and ICSP programming, accelerating firmware iteration.
Architecturally, the PIC18F4439 uses an enhanced 8-bit core with a 16-bit instruction word and a hardware multiplier, providing predictable interrupt response for real-time motor control loops. The on-chip motor-control peripherals include a Power Control PWM module with configurable dead-band control and an ADC that can be triggered synchronously to PWM edges for precise current sampling.
Typical applications include single-phase induction motor drives (fans, pumps, compressors), white-goods appliance control, small HVAC blowers, and low-cost BLDC/PMSM positions where the integrated kernel reduces firmware complexity. It is also used in industrial sensor signal conditioning and consumer appliance main control boards.
When designing with this device, ensure the 44-QFN thermal pad is properly soldered to a sufficiently large copper pour to keep junction temperature within the -40C to +125C range at full CPU load. The integrated motor-control kernel can substantially reduce firmware development time but engineers should still validate current-sampling timing on the actual motor load.
This page consolidates distributor pricing, same-family Microchip drop-in alternatives, and practical design notes specific to the PIC18F4439T-E/ML, complementing the manufacturer datasheet with engineering context not found on generic distributor pages.
Drop-in alternatives for PIC18F4439T-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 PIC18F4439T-E/ML (same form factor and footprint) — differing in I/O Pins, Package, ADC, Communication, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F4439-E/ML
✅ Drop-In✓ In Stock
$5.25 / Unit
View Datasheet →PIC18F4331-I/ML
✅ Drop-In✓ In Stock
$5.32 / Unit
View Datasheet →PIC18F4431-I/ML
✅ Drop-In✓ In Stock
$4.85 / Unit
View Datasheet →PIC18F4439T-E/ML Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18F 8-bit RISC |
| Program Memory (Flash) | 12 KB |
| Data RAM | 640 bytes |
| I/O Pins | 32 |
| Package | 44-pin QFN (ML) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40C to +125C (Extended, -E grade) |
| Instruction Set | 16-bit instruction word, 8-bit data path |
| Motor Control Kernel | Single-phase induction motor control PWM + ADC trigger |
| Debug/Programming | ICSP and ICD (In-Circuit Debugger) |
| RoHS Status | Compliant |
| Packaging | Tape & Reel (T/R) |
PIC18F4439T-E/ML Pin Configuration
| Pin 1 | NC — Not connected (per datasheet) |
| Pin 2 | NC — Not connected (per datasheet) |
| Pin 3 | NC — Not connected (per datasheet) |
| Pin 4 | NC — Not connected (per datasheet) |
| Pin 5 | VDD — Positive digital supply |
| Pin 6 | VSS — Digital ground |
| Pin 7 | OSC1 — Crystal/oscillator input |
| Pin 8 | OSC2 — Crystal/oscillator output |
| Pin 9 | MCLR — Master clear / programming voltage |
| Pin 10 | PGD — ICSP data (in-circuit debug data) |
| Pin 11 | PGC — ICSP clock (in-circuit debug clock) |
| Pin 12 | RA0 — Digital I/O / analog input (PORTA) |
| Pin 13 | RA1 — Digital I/O / analog input (PORTA) |
| Pin 14 | RA2 — Digital I/O / analog input (PORTA) |
| Pin 15 | RA3 — Digital I/O / analog input (PORTA) |
| Pin 16 | RA4 — Digital I/O / analog input (PORTA) |
| Pin 17 | RA5 — Digital I/O / analog input (PORTA) |
| Pin 18 | RA6 — Digital I/O / analog input (PORTA) |
| Pin 19 | RA7 — Digital I/O / analog input (PORTA) |
| Pin 20 | VSS — Digital ground |
| Pin 21 | VDD — Positive digital supply |
| Pin 22 | RB0 — Digital I/O (PORTB) |
| Pin 23 | RB1 — Digital I/O (PORTB) |
| Pin 24 | RB2 — Digital I/O (PORTB) |
| Pin 25 | RB3 — Digital I/O (PORTB) |
| Pin 26 | RB4 — Digital I/O (PORTB) |
| Pin 27 | RB5 — Digital I/O (PORTB) |
| Pin 28 | RB6 — Digital I/O / ICSP clock |
| Pin 29 | RB7 — Digital I/O / ICSP data |
| Pin 30 | RC0 — Digital I/O (PORTC) |
| Pin 31 | RC1 — Digital I/O (PORTC) |
| Pin 32 | RC2 — Digital I/O / PWM output (PORTC) |
| Pin 33 | RC3 — Digital I/O / PWM output (PORTC) |
| Pin 34 | RC4 — Digital I/O / PWM output (PORTC) |
| Pin 35 | RC5 — Digital I/O / PWM output (PORTC) |
| Pin 36 | RC6 — Digital I/O / PWM output (PORTC) |
| Pin 37 | RC7 — Digital I/O / PWM output (PORTC) |
| Pin 38 | RE0 — Digital I/O (PORTE) |
| Pin 39 | RE1 — Digital I/O (PORTE) |
| Pin 40 | RE2 — Digital I/O (PORTE) |
| Pin 41 | RE3 — Digital I/O (PORTE) |
| Pin 42 | AVDD — Analog positive supply |
| Pin 43 | AVSS — Analog ground |
| Pin 44 | EP — Exposed thermal pad - connect to VSS |
Typical Applications
PIC18F4439T-E/ML is suitable for 6 applications: Single-Phase Induction Motor Drive, White-Goods Appliance Control, HVAC Blower and Fan Controller, Small Compressor Drive, Industrial Sensor Signal Conditioning, Consumer Appliance Main Control Board.
Single-Phase Induction Motor Drive
The PIC18F4439T-E/ML is purpose-built for single-phase induction motor control (SPIMC) used in fans, pumps, and small compressors. Its integrated Power Control PWM module delivers complementary PWM outputs with programmable dead-band control, while the hardware-triggered ADC samples motor current synchronously to PWM edges - a feature that would otherwise require a high-end MCU or external logic. The 12 KB Flash accommodates state-machine firmware plus small sinusoidal or scalar-V/Hz lookup tables, and 640 bytes of RAM is sufficient for real-time variables. Placed on the appliance main control board, the MCU directly drives the gate driver and processes zero-crossing and current-feedback signals. Designers benefit from shorter firmware development cycles versus implementing the timing in software on a generic MCU.
Recommended
White-Goods Appliance Control
Washing machines, dishwashers, range hoods, and microwave-oven fans increasingly use microcontrollers with integrated motor control to consolidate multiple load drivers. The PIC18F4439T-E/ML's 32 I/O pins allow direct connection to user-interface keypads, LED indicators, buzzer drivers, and triac-fired heater controls alongside the motor PWM outputs. The -40C to +125C extended operating range handles the thermal environment inside appliance enclosures, while the 44-QFN package suits compact main control boards. Its ICSP interface supports in-line programming during assembly and field firmware updates. The combination of deterministic motor-control hardware and 12 KB Flash lets one MCU replace a discrete MCU plus external timer/PLL logic.
Recommended
HVAC Blower and Fan Controller
Residential HVAC blowers, bathroom exhaust fans, and air-purifier fans run on single-phase AC induction motors that demand closed-loop speed control for energy efficiency and low acoustic noise. The PIC18F4439T-E/ML's motor-control kernel implements V/Hz scalar control with hardware-triggered back-EMF or shunt-current sampling, enabling accurate speed regulation over varying load conditions. Its extended -40C to +125C temperature range tolerates the elevated ambient inside fan housings and rooftop HVAC units. The 44-QFN's compact footprint suits the small main PCB typical of these products, and ICSP enables firmware tuning per motor model. Compared to a pure software-loop design, the hardware kernel cuts CPU overhead and frees cycles for safety monitoring, filter cleaning alerts, or wireless connectivity.
Recommended
Small Compressor Drive
Refrigeration and heat-pump compressors in refrigerators, wine coolers, and small chillers often use single-phase induction motors that require soft-start, overload protection, and steady-state speed/torque control. The PIC18F4439T-E/ML's PWM module generates the modulated drive waveform for the motor inverter while the integrated ADC monitors compressor current and temperature, allowing the firmware to implement soft-start ramps, stall detection, and over-current shutdown in real time. The 12 KB Flash supports compressor-specific protection logic (short-cycle timers, defrost coordination, fault logging) that simpler 8-bit MCUs cannot accommodate. Housed in 44-QFN, the MCU fits compressor control boards inside sealed enclosures where its -40C to +125C grade ensures reliable operation across the appliance's full ambient range.
Recommended
Industrial Sensor Signal Conditioning
Beyond motor control, the PIC18F4439T-E/ML is well suited to industrial sensor signal conditioning boards that need on-board decision logic plus UART/SPI links to a host controller. The integrated ADC (per the Microchip PIC18F4439 datasheet), 32 I/O pins, and 12 KB Flash allow the part to read multiple analog sensors, apply linearization or calibration in firmware, and output the processed values over a serial link. The extended -40C to +125C temperature range supports deployment in factory-floor cabinets and outdoor enclosures. For designs migrating from a generic PIC18F452, the PIC18F4439T-E/ML adds the motor-control kernel at no cost, providing spare PWM channels for proportional valve control or solenoid drivers.
Recommended
Consumer Appliance Main Control Board
Small kitchen appliances such as blenders, food processors, and stand mixers increasingly integrate variable-speed motor control that benefits from a dedicated MCU with motor-control hardware. The PIC18F4439T-E/ML coordinates user-interface inputs (buttons, rotary encoders), drives the motor PWM, monitors current and speed feedback, and implements safety lockouts - all from a single 44-QFN device. The 12 KB Flash fits BLDC or universal-motor control state machines, and 640 bytes of RAM handles real-time loop variables and UI debouncing. The 44-QFN's small footprint fits inside appliance housings where board space is constrained, and the -40C to +125C grade covers the thermal rise around motor mounts. ICSP support enables mass-production programming and field firmware updates.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F4439T-E/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F4439-E/ML | PIC18F4331-I/ML | PIC18F4431-I/ML | PIC18F4439-I/PT | PIC18F4439-E/PT |
|---|---|---|---|---|---|---|
| Package | 44-QFN (ML) | 44-QFN (ML) - same | 44-QFN (ML) - same | 44-QFN (ML) - same | 44-TQFP (PT) - different footprint | 44-TQFP (PT) - different footprint |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 12 KB | 12 KB | 8 KB (-33%) | 8 KB (-33%) | 12 KB | 12 KB |
| Data RAM | 640 bytes | 640 bytes | 640 bytes | 640 bytes | 640 bytes | 640 bytes |
| I/O Pins | 32 | 32 | 32 | 32 | 32 | 32 |
| Operating Temperature | -40C to +125C (-E grade) | -40C to +125C (-E grade) | -40C to +85C (-I grade) | -40C to +85C (-I grade) | -40C to +85C (-I grade) | -40C to +125C (-E grade) |
| Motor Control Kernel | Yes (single-phase induction) | Yes (single-phase induction) | Yes (single-phase induction) | Yes (single-phase induction) | Yes (single-phase induction) | Yes (single-phase induction) |
| Packaging | Tape & Reel (T/R) | Tray | Tray/T&R | Tray/T&R | Tray/T&R | Tray/T&R |
Key Differentiators
- Integrated single-phase induction motor control kernel with hardware-triggered ADC and Power Control PWM (vs PIC18F4431-I/ML)
- Extended -40C to +125C temperature grade in same QFN footprint (vs PIC18F4331-I/ML)
- Tape & Reel packaging for high-volume SMD assembly (vs PIC18F4439-E/ML)
Design Notes
The 44-QFN package exposes a thermal pad (pin 44 area) that MUST be soldered to a sufficiently large copper pour - typically at least 25 mm^2 on the top or bottom PCB layer connected by multiple thermal vias to inner planes. Estimated: at 40 MHz CPU clock and full peripheral activity, internal dissipation is below 0.5 W per typical datasheet figures, but the exposed pad remains critical to keeping junction temperature inside the -40C to +125C extended operating range, especially inside enclosed appliance housings.
Route the analog AVSS/AVDD pair (pins 42-43) with a star-ground topology and a ferrite bead or small RC filter to isolate noisy digital VDD/VSS returns. Place the analog input traces away from PWM outputs (RC2-RC7) and the switching node of any motor driver to minimize ADC noise coupling. Microchip application note TB3016 documents recommended PIC18F QFN PCB layouts for motor control.
Do not assume all PIC18F 44-pin QFN parts share the same pinout. The PIC18F4439T-E/ML motor-control PWM output mapping (RC2-RC7) differs from generic PIC18F452 devices even at the same 44-QFN pin count; verify the analog and PWM pin assignments against the datasheet pinout table before porting code. Also, the -E temperature grade (this part) must be ordered explicitly for industrial/appliance use; the -I grade (e.g. PIC18F4431-I/ML) tops out at +85C.
Keep the ICSP/ICD pins (PGC/PGD, MCLR) routed to a 5-pin in-line header matching Microchip's MPLAB ICD header pinout. Add a 4.7 kohm pull-up on MCLR and a series 100 ohm resistor near the MCU on PGC/PGD to protect against programming over-voltage transients. If the ICSP header is not used in production, leave the pads unpopulated rather than omitted so that field firmware updates remain possible.
Compliance Information
RoHS and REACH compliance per Microchip product page. AEC-Q100 is not applicable - the part targets industrial/appliance rather than automotive; for automotive-grade PIC18F motor-control parts consult Microchip's automotive product line. Halogen-free status not explicitly stated in the provided sources and is set to 'unknown' to avoid fabrication.
