PIC18F2439T-I/SO - 12KB Flash 8-bit MCU | Microchip | Motor Control
MPN: PIC18F2439T-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.95 | $5.95 |
| 10 | $5.36 | $53.60 |
| 100 | $4.76 | $476.00 |
| 500 | $4.29 | $2,145.00 |
| 1,000 | $3.81 | $3,810.00 |
PIC18F2439T-I/SO Overview
An 8-bit microcontroller (MCU) is a small computer-on-a-chip integrating a CPU, memory, and peripherals on a single die. The PIC18 family sits in the upper tier of Microchip's 8-bit MCU portfolio, providing an enhanced 16-bit instruction word, linear memory addressing, and C-friendly architecture. The motor-control kernel adds hardware PWM, dead-band control, and phase commutation logic, placing it between a generic MCU and a dedicated motor-control DSP in capability.
Key features include a maximum CPU clock of 40 MHz (10 MIPS), 21 general-purpose digital I/O pins, a 10-bit ADC with up to 5 channels, enhanced PWM with up to 3 channels, and a dedicated power-control PWM module. Communication peripherals include I2C, SPI, and USART (RS-485/RS-232 LIN support). The Capture/Compare/PWM (CCP) and Enhanced CCP modules deliver hardware dead-band generation ideal for half-bridge drives.
Typical applications include single-phase induction motor drives, fan and pump controllers, washing-machine universal motor control, small appliance variable-speed drives, ceiling-fan controllers, and HVAC blower control. The integrated motor-control peripheral reduces firmware complexity and BOM cost by replacing external gate-driver timing logic.
When designing with this part, ensure your firmware initializes the motor-control kernel registers correctly and that the brown-out reset voltage is configured for your power-rail characteristics. The wide-body SOIC package provides adequate thermal performance for industrial enclosures, but PCB layout must respect the analog and digital ground separation recommended in the datasheet.
Drop-in alternatives for PIC18F2439T-I/SO — 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 PIC18F2439T-I/SO (same form factor and footprint) — differing in ADC, Operating Temperature, Package, Core Architecture, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F2439-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F2439-E/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F2431-I/SO
✅ Drop-In✓ In Stock
$4.85 / Unit
View Datasheet →DSPIC33FJ12MC202-I/SO
✅ Drop-In✓ In Stock
$3.85 / Unit
View Datasheet →PIC18F2420-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F242-I/SO
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.5 / Unit
View Datasheet →PIC18F2439T-I/SO Maximum Ratings & Electrical Characteristics
| Family | PIC18 |
| Series | PIC 18F |
| Core | 8-bit PIC RISC |
| Program Memory | 12 KB (6K x 16) Flash |
| RAM | 640 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Frequency | 40 MHz |
| Instruction Throughput | 10 MIPS |
| Operating Voltage | 2.0 V to 5.5 V |
| I/O Pins | 21 |
| ADC | 10-bit, up to 5 channels |
| PWM Channels | Enhanced PWM, up to 3 channels + dedicated motor-control PWM |
| Communication | I2C, SPI, USART (RS-485/RS-232 LIN) |
| Timers | Multiple 8-bit and 16-bit timers |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 28-pin SOIC (0.295 inch / 7.50 mm width) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| MSL Level | 1 (unlimited floor life) |
PIC18F2439T-I/SO Pin Configuration
| Pin 1 | RA2/AN2/VREF- — Port A bit 2 / Analog input 2 / ADC negative reference |
| Pin 2 | RA3/AN3/VREF+ — Port A bit 3 / Analog input 3 / ADC positive reference |
| Pin 3 | RA4/AN4 — Port A bit 4 / Analog input 4 |
| Pin 4 | RA5/AN5 — Port A bit 5 / Analog input 5 |
| Pin 5 | VSS — Ground reference |
| Pin 6 | OSC1/CLKI/RA7 — Crystal oscillator input / external clock input / Port A bit 7 |
| Pin 7 | OSC2/CLKO/RA6 — Crystal oscillator output / clock output / Port A bit 6 |
| Pin 8 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 9 | RC1/T1OSI — Port C bit 1 / Timer1 oscillator input |
| Pin 10 | RC2/CCP1 — Port C bit 2 / Capture/Compare/PWM channel 1 |
| Pin 11 | RC3 — Port C bit 3 |
| Pin 12 | RC4 — Port C bit 4 |
| Pin 13 | RC5 — Port C bit 5 |
| Pin 14 | RC6/TX/CK — Port C bit 6 / USART transmit / USART clock |
| Pin 15 | RC7/RX/DT — Port C bit 7 / USART receive / USART data |
| Pin 16 | RB0/INT0 — Port B bit 0 / External interrupt 0 |
| Pin 17 | RB1/INT1 — Port B bit 1 / External interrupt 1 |
| Pin 18 | RB2 — Port B bit 2 |
| Pin 19 | RB3 — Port B bit 3 |
| Pin 20 | RB4 — Port B bit 4 |
| Pin 21 | RB5 — Port B bit 5 |
| Pin 22 | RB6/PGC — Port B bit 6 / ICSP clock |
| Pin 23 | RB7/PGD — Port B bit 7 / ICSP data |
| Pin 24 | VSS — Ground reference (second pin) |
| Pin 25 | VDD — Positive supply voltage |
| Pin 26 | MCLR/VPP — Master clear reset / programming voltage |
| Pin 27 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| Pin 28 | RA1/AN1 — Port A bit 1 / Analog input 1 |
Typical Applications
PIC18F2439T-I/SO is suitable for 6 applications: Single-Phase Induction Motor Drives, Fan Speed Controllers, Pump Variable-Frequency Drives, Washing-Machine Motor Control, HVAC Blower Speed Controllers, Small Appliance Variable-Speed Drives.
Single-Phase Induction Motor Drives
The PIC18F2439T-I/SO is purpose-built for single-phase induction motor variable-frequency drives, leveraging its dedicated hardware motor-control kernel to generate sinusoidal PWM with hardware dead-band insertion. The 12 KB Flash holds motor-state-machine firmware plus speed PI controller, while the 10 MIPS throughput closes the current loop within 100 usec. Placed between the rectifier/DC bus and the IGBT/MOSFET inverter stage, the MCU directly drives the gate-driver stage without external commutation logic. Unlike a generic PIC18F2420-I/SO, the integrated kernel eliminates firmware PWM timing jitter, improving torque ripple and audible noise versus pure software implementations.
Recommended
Fan Speed Controllers
Ceiling fans, exhaust fans, and PC cooling fans benefit from the PIC18F2439T-I/SO's 12 KB Flash and integrated PWM kernel for stepless speed control. The 10-bit ADC samples back-EMF or current-sense signals for closed-loop regulation, while the PWM module generates the variable-frequency drive waveform at up to 20 kHz for inaudible operation. Placed inline with the TRIAC or MOSFET switching element, the MCU provides soft-start and overcurrent protection. Compared to a discrete 555-timer-based controller, the PIC18F2439T-I/SO adds programmable acceleration ramps and remote-control interfaces via UART/IR.
Recommended
Pump Variable-Frequency Drives
Water pumps and circulation pumps use the PIC18F2439T-I/SO to implement constant-pressure or constant-flow control via integrated motor-control PWM. The 640-byte RAM accommodates the PID controller state, while the 12 KB Flash holds fault-detection routines (dry-run, overcurrent, over-temperature). The 21 I/O pins interface pressure transducers, flow sensors, and HMI keypads without external I/O expanders. Placed between the line-voltage sensing circuit and the inverter power stage, the MCU provides 16-bit timer resolution for accurate flow control versus 8-bit MCU alternatives.
Recommended
Washing-Machine Motor Control
Washing machines use the PIC18F2439T-I/SO for universal motor and single-phase induction motor control, where the dedicated kernel handles wash/spin cycle torque profiles and drum-balancing algorithms. The 40 MHz CPU closes the speed-control loop in under 200 usec, and the 12 KB Flash holds drum-imbalance detection routines and UI state machines. Placed between the AC-zero-cross detect circuit and the TRIAC/inverter stage, the MCU orchestrates the full wash cycle. Compared to discrete analog controllers, the PIC18F2439T-I/SO adds EEPROM-backed cycle memory and LIN-bus connectivity for appliance networking.
Recommended
HVAC Blower Speed Controllers
HVAC blower motors benefit from the PIC18F2439T-I/SO's integrated motor-control kernel for smooth multi-speed control, ramp-up/ramp-down, and stall detection. The 21 I/O pins interface thermostat inputs, mode-control relays, and tachometer feedback signals without external glue logic. Placed between the 24 VAC control signal conditioning and the blower relay/inverter stage, the MCU executes the heating/cooling blower profile. The 640-byte RAM holds the state machine for auto-mode transitions, and the -40C to +85C industrial temperature rating supports unconditioned attic installations.
Recommended
Small Appliance Variable-Speed Drives
Blenders, food processors, and power tools use the PIC18F2439T-I/SO to provide soft-start, speed-feedback, and overload protection for universal motors. The integrated PWM module drives the TRIAC phase-angle control directly via hardware, while the 10-bit ADC samples motor current for torque-limiting algorithms. Placed between the speed-control potentiometer and the TRIAC gate driver, the MCU handles ramp-up, brake, and pulse modes. The 12 KB Flash supports custom speed profiles stored in EEPROM for repeatable operation. Compared to a discrete analog phase controller, the PIC18F2439T-I/SO adds adaptive braking and stall recovery.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F2439T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F2439-I/SO | PIC18F2439-E/SO | PIC18F2431-I/SO | DSPIC33FJ12MC202-I/SO | PIC18F2420-I/SO |
|---|---|---|---|---|---|---|
| Package | 28-pin SOIC (0.295 inch / 7.50 mm) | 28-pin SOIC - same | 28-pin SOIC - same | 28-pin SOIC - same | 28-pin SOIC - same | 28-pin SOIC - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Program Memory | 12 KB Flash | 12 KB Flash - same | 12 KB Flash - same | 16 KB Flash (+33%) | 12 KB Flash - same | 16 KB Flash (+33%) |
| Motor-Control Kernel | Single-phase induction (hardware) | Single-phase induction (hardware) - same | Single-phase induction (hardware) - same | Three-phase BLDC (hardware) | Three-phase motor control (16-bit dsPIC) | None (general-purpose MCU) |
| Core Architecture | 8-bit PIC18 (10 MIPS @ 40 MHz) | 8-bit PIC18 - same | 8-bit PIC18 - same | 8-bit PIC18 - same | 16-bit dsPIC33 (40 MIPS @ 40 MHz) | 8-bit PIC18 - same |
| Maximum Clock Frequency | 40 MHz | 40 MHz - same | 40 MHz - same | 40 MHz - same | 40 MHz - same | 40 MHz - same |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C - same | -40C to +125C (Extended) | -40C to +85C - same | -40C to +85C - same | -40C to +85C - same |
| ADC Resolution | 10-bit | 10-bit - same | 10-bit - same | 10-bit - same | 10-bit - same | 10-bit - same |
| I/O Pins | 21 | 21 - same | 21 - same | 21 - same | 21 - same | 23 (+2) |
Key Differentiators
- Dedicated hardware single-phase motor-control kernel (vs PIC18F2420-I/SO)
- Higher 12 KB Flash versus lower-memory siblings (vs PIC18F2331-I/SP)
- Single-phase focus versus three-phase variants (vs PIC18F2431-I/SO)
Design Notes
Estimated: At 40 MHz CPU clock and full peripheral activity (PWM + ADC + UART), VDD current draw is approximately 25 mA per the Microchip datasheet typical characteristics. Add a 100 nF ceramic decoupling capacitor directly at each VDD/SS pair (pins 25/24 and 1/5) within 3 mm of the package, plus a bulk 10 uF tantalum at the board power entry. The wide-body SOIC handles typical MCU dissipation without a heatsink but ensure supply trace width carries 50 mA peak without voltage drop.
The 28-pin SOIC wide-body footprint follows JEDEC MS-013 with 1.27 mm pin pitch. Recommended land pattern is per IPC-7351 nominal density with pad width 0.6 mm and length 1.7 mm per pin. Keep analog signal traces (AN0-AN5) away from PWM output traces (RC2/CCP1) to minimize coupled noise. Provide a single-point ground connection between digital ground and analog ground, with the ADC VREF+ bypassed by 10 uF + 100 nF ceramic capacitors.
Critical: The PIC18F2439T-I/SO single-phase motor-control kernel registers must be initialized in the order specified in the datasheet, otherwise the PWM outputs may latch in an undefined state at startup, potentially driving the inverter bridge into shoot-through. Brown-out reset voltage should be configured to 4.5V for 5V systems or 2.85V for 3.3V systems. The MCLR pin (pin 26) requires a 10 kohm pull-up to VDD; do not leave it floating or the device may reset intermittently during motor switching transients.
For motor-control applications where switching transients can reach 50 V/usec on the inverter, place the MCU at least 25 mm from the IGBT/MOSFET switching stage and route PWM outputs RC2/CCP1 with a ground-referenced coplanar waveguide or guarded trace. The analog sense inputs (AN0-AN5) should be RC-filtered with 100 ohm series + 1 nF shunt to ground, with cutoff around 1.6 MHz, well above the PWM fundamental but below MCU clock harmonics.
Compliance Information
RoHS compliant and lead-free per Microchip product page. Not AEC-Q100 qualified - this is an industrial-grade MCU; for automotive motor control consider PIC18F2431-E/SO extended-temperature variants or dsPIC33 automotive AEC-Q100 grades.
