PIC18F2539T-I/SO - 8-bit MCU, 24KB Flash, 40MHz, 28-SOIC | Microchip
MPN: PIC18F2539T-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.95 | $5.95 |
| 10 | $5.36 | $53.60 |
| 100 | $4.78 | $478.00 |
| 500 | $4.28 | $2,140.00 |
| 1,000 | $3.82 | $3,820.00 |
PIC18F2539T-I/SO Overview
An 8-bit microcontroller (MCU) is a single-chip computer that combines a CPU, program memory, data memory, and peripherals on one silicon die. The PIC18 family belongs to the broader class of microcontrollers, which sit inside the embedded computing hierarchy: MCU -> microcontroller -> embedded controller -> semiconductor IC. PIC18 parts use a Harvard RISC architecture with 16-bit instructions and 8-bit data paths, and the PIC18F2539 specifically integrates a hardware motor-control PWM kernel.
Key features include 24KB Flash (12K x 16 words), 1408 bytes SRAM, 256 bytes EEPROM, two 8-bit timers and three 16-bit timers, a 10-bit ADC with up to 5 channels, and a sophisticated Power Control PWM module for motor commutation. The device supports in-circuit serial programming (ICSP) and in-circuit debugging (ICD), an MSSP I2C/SPI peripheral, an enhanced USART, and an operating voltage range of 4.2V to 5.5V with industrial temperature grade (-40C to +85C).
The PIC18F2539 merges the standard PIC18 architecture with a specialized motor-control kernel targeted at single-phase induction motor control. This kernel handles input capture, output compare, and PWM generation for variable-frequency drives, eliminating the need for external logic. The wide-bandgap analog front end and 10-bit ADC enable closed-loop current and voltage sensing, while the enhanced USART and MSSP support communication with master controllers.
Typical applications include single-phase induction motor drives for fans, pumps, and small appliances, washing-machine motor controllers, BLDC/PMSM auxiliary drive boards, and HVAC damper controls. Its 21 I/O pins and 40MHz throughput allow direct interfacing to power-stage gate drivers, Hall-effect sensors, and tachometer feedback paths without external glue logic.
When designing with this device, allocate at least one I/O pin for the fault input from the gate-driver stage and ensure the ADC reference pin (RA3) is bypassed with a 0.1uF ceramic capacitor. The 'T' suffix denotes Tape and Reel packaging for high-volume assembly, and the '-I' suffix denotes the industrial temperature grade (-40C to +85C). This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC18F2539T-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 PIC18F2539T-I/SO (same form factor and footprint) — differing in Package, I/O Pins, RoHS Status, ADC, Communication.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F2539-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F2539-E/SO
✅ Drop-In✓ In Stock
$6.1 / Unit
View Datasheet →PIC18F4539-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F2439T-I/SO
✅ Drop-In✓ In Stock
$3.81 / Unit
View Datasheet →PIC18F2539T-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18, 8-bit RISC |
| Program Memory (Flash) | 24 KB (12K x 16 words) |
| Data SRAM | 1408 bytes |
| Data EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz |
| Operating Voltage (VDD) | 4.2 V to 5.5 V |
| I/O Pins | 21 |
| ADC | 10-bit, 5 channels |
| Timers | 2 x 8-bit, 3 x 16-bit |
| PWM Module | Power Control PWM (motor-control kernel) |
| Communication | Enhanced USART, MSSP (I2C/SPI) |
| Package | 28-pin SOIC wide (7.50 mm body), Tape and Reel |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Programming/Debug | ICSP, ICD |
| RoHS Status | Compliant (per Microchip product page) |
PIC18F2539T-I/SO Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (reset) input or programming voltage |
| Pin 2 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Pin 3 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Pin 4 | RA2/AN2 — Digital I/O / Analog input channel 2 |
| Pin 5 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / ADC positive reference |
| Pin 6 | RA4/AN4 — Digital I/O / Analog input channel 4 (open-drain) |
| Pin 7 | RA5/AN5 — Digital I/O / Analog input channel 5 |
| Pin 8 | RE0/AN6 — Digital I/O / Analog input channel 6 |
| Pin 9 | RE1/AN7 — Digital I/O / Analog input channel 7 |
| Pin 10 | RE2/AN8 — Digital I/O / Analog input channel 8 |
| Pin 11 | VDD — Positive supply voltage (4.2V to 5.5V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKI — Crystal oscillator input / external clock |
| Pin 14 | OSC2/CLKO — Crystal oscillator output |
| Pin 15 | RC0/T1OSO — Digital I/O / Timer1 oscillator output |
| Pin 16 | RC1/T1OSI — Digital I/O / Timer1 oscillator input |
| Pin 17 | RC2/CCP1 — Digital I/O / Capture/Compare/PWM 1 |
| Pin 18 | RC3 — Digital I/O |
| Pin 19 | RC4 — Digital I/O |
| Pin 20 | RC5 — Digital I/O |
| Pin 21 | RC6/TX/CK — Digital I/O / USART asynchronous transmit / clock |
| Pin 22 | RC7/RX/DT — Digital I/O / USART asynchronous receive / data |
| Pin 23 | RB0/INT0 — Digital I/O / External interrupt 0 |
| Pin 24 | RB1/INT1 — Digital I/O / External interrupt 1 |
| Pin 25 | RB2/INT2 — Digital I/O / External interrupt 2 |
| Pin 26 | RB3/INT3 — Digital I/O / External interrupt 3 |
| Pin 27 | RB4 — Digital I/O (interrupt-on-change) |
| Pin 28 | RB5 — Digital I/O (interrupt-on-change) |
Typical Applications
PIC18F2539T-I/SO is suitable for 6 applications: Single-Phase Induction Motor Drive, Washing Machine Motor Controller, HVAC Fan and Blower Control, Small Appliance Pump Drive, Refrigerator Compressor Control, Industrial Fan Speed Controller.
Single-Phase Induction Motor Drive
The PIC18F2539T-I/SO is purpose-built by Microchip for single-phase induction motor control, integrating a Power Control PWM kernel that handles complementary PWM generation, programmable dead-band, and fault shutdown. The 40MHz core and 21 I/O pins allow direct interfacing to gate drivers, zero-cross detection, and tachometer feedback without external glue logic. The 10-bit 5-channel ADC samples motor current and voltage for closed-loop torque or speed regulation, and 24KB Flash holds state-machine plus soft-start routines. Unlike a general-purpose MCU, the dedicated motor kernel reduces CPU overhead, freeing cycles for communication or protection algorithms.
Recommended
Washing Machine Motor Controller
The PIC18F2539T-I/SO drives the wash-cycle agitator motor in home appliances, leveraging its integrated motor-control PWM to vary frequency and amplitude across the drum cycle. Its 24KB Flash holds wash profile tables, fault diagnostics, and user-interface handlers, while 1408 bytes of SRAM buffer sensor data between ADC interrupts. The enhanced USART links to the appliance main board for cycle reporting, and the MSSP I2C bus connects to the HMI keypad. Industrial temperature grade (-40C to +85C) tolerates the hot, humid environment near the motor housing.
Recommended
HVAC Fan and Blower Control
The PIC18F2539T-I/SO controls variable-speed HVAC fans by generating PWM outputs that modulate TRIAC or IGBT gate timing based on temperature sensor feedback. The 5-channel ADC reads thermistor inputs from multiple zones, and the motor-control kernel provides smooth acceleration ramps that reduce acoustic noise. Industrial temperature grade supports attic and rooftop installations, and the 40MHz throughput runs PID control loops with sub-millisecond update rates. The MSSP peripheral links to the HVAC master controller for setpoint commands.
Recommended
Small Appliance Pump Drive
The PIC18F2539T-I/SO drives small single-phase pumps in dishwashers, water heaters, and dosing systems, where its Power Control PWM produces the variable-frequency drive signal needed for soft-start and flow regulation. The 24KB Flash stores pump calibration curves and dry-run detection routines, and the 10-bit ADC monitors both supply current and pressure sensor feedback. The 21 I/O pins handle multiple pump channels, valve control relays, and indicator LEDs. Tape and Reel packaging supports automated SMT assembly in high-volume appliance manufacturing.
Recommended
Refrigerator Compressor Control
The PIC18F2539T-I/SO manages variable-speed compressor drives in refrigerators, using the motor-control PWM to optimize compressor speed for energy efficiency and reduced acoustic noise. Its integrated fault detection responds to over-current and stall conditions within microseconds, protecting the compressor windings. The MSSP I2C bus interfaces with the refrigerator's main controller board, while 24KB Flash stores compressor profile data and adaptive defrost algorithms. The industrial temperature range accommodates compressor compartment heat.
Recommended
Industrial Fan Speed Controller
The PIC18F2539T-I/SO serves as the controller in industrial cabinet cooling fans, where its motor-control kernel provides smooth variable-speed operation to reduce noise and power consumption versus fixed-speed fans. The 10-bit ADC monitors airflow temperature and adjusts PWM duty cycle for closed-loop thermal regulation, and the enhanced USART supports Modbus RTU communication with the host PLC. The 21 I/O pins accommodate multiple fan channels and tachometer inputs, while 24KB Flash stores alarm logs and PID tuning parameters.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F2539T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F2539-I/SO | PIC18F2539-E/SO | PIC18F4539-I/SO | PIC18F2439T-I/SO |
|---|---|---|---|---|---|
| Package | SOIC-28 wide (7.50mm) | SOIC-28 wide (7.50mm) - same | SOIC-28 wide (7.50mm) - same | SOIC-28 wide (7.50mm) - same | SOIC-28 wide (7.50mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Flash | 24 KB (12K x 16) | 24 KB (same) | 24 KB (same) | 32 KB (+33%) | 16 KB (-33%) |
| Data SRAM | 1408 bytes | 1408 bytes (same) | 1408 bytes (same) | 1408 bytes (same) | 768 bytes (-45%) |
| Maximum CPU Speed | 40 MHz | 40 MHz (same) | 40 MHz (same) | 40 MHz (same) | 40 MHz (same) |
| I/O Pins | 21 | 21 (same) | 21 (same) | 21 (same) | 15 (-29%) |
| Temperature Grade | Industrial (-40C to +85C) | Industrial (same) | Extended (-40C to +125C) | Industrial (same) | Industrial (same) |
| Packaging Format | Tape and Reel (T suffix) | Tube | Tube | Tube | Tape and Reel |
| Motor-Control PWM Kernel | Yes (single-phase optimized) | Yes (same) | Yes (same) | Yes (same) | Yes (same) |
Key Differentiators
- Integrated Power Control PWM kernel for single-phase induction motor control (vs PIC18F252-I/SO)
- Larger Flash and RAM versus PIC18F2439T-I/SO for complex control algorithms (vs PIC18F2439T-I/SO)
- Tape and Reel packaging for high-volume SMT assembly (vs PIC18F2539-I/SO)
Design Notes
Decouple VDD with a 10uF tantalum or ceramic bulk capacitor in parallel with a 0.1uF ceramic placed within 5mm of the VDD pin. For motor-control applications with high-current switching nearby, add a ferrite bead or small inductor between the digital 5V rail and the MCU's VDD pin to isolate digital noise from the analog AVdd/AVss pair. The ADC reference pin (RA3/VREF+) requires its own 0.1uF ceramic bypass and optionally a 10uF bulk capacitor if high ADC accuracy is required.
Route the motor-driver gate signals (PWM outputs) away from analog input traces to minimize capacitive coupling. Place the MCLR pull-up resistor (typically 10k ohm) close to the MCLR pin, and route the ICSP programming signals (RB6/RB7 on compatible PICs, or dedicated PGD/PGC pins) to a header accessible for in-circuit programming. Keep the crystal traces short and symmetric, and surround the oscillator area with a ground pour to reduce EMI pickup.
Verify the SOIC package width (7.50mm wide-body) before designing the PCB footprint - PIC18F2539T-I/SO uses the wide SOIC-28, which differs from the 5.30mm narrow SOIC-28 used by PIC18F252-I/SO. Failure to check this will result in pads that do not match the component. Also note that the 'T' suffix denotes Tape and Reel packaging; prototype builds often use the tube-packaged -I/SO variant. Ensure brown-out reset is configured in firmware to prevent code corruption during motor-drive supply dips.
Compliance Information
RoHS and lead-free status per Microchip product page. AEC-Q100 automotive grade is not applicable for this industrial-grade part; for automotive motor-control applications, contact Microchip about dsPIC33 variants.
