PIC18F2539-E/SO - 24KB Flash 8-bit MCU Motor Control | Microchip
MPN: PIC18F2539-E/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.32 | $9.32 |
| 10 | $8.41 | $84.10 |
| 100 | $7.55 | $755.00 |
| 500 | $6.74 | $3,370.00 |
| 1,000 | $6.1 | $6,100.00 |
PIC18F2539-E/SO Overview
A microcontroller (MCU) is an integrated circuit that combines a CPU core, program and data memory, and peripheral interfaces on a single silicon die. Within the broader taxonomy, the PIC18F2539 sits at the microcontrollers -> integrated circuits -> semiconductors hierarchy. The PIC18 architecture in particular is a family of 8-bit RISC microcontrollers from Microchip Technology optimized for C-compiler-friendly development and deterministic interrupt handling. The PIC18F2539 belongs to the PIC18FXX39 sub-family that adds dedicated motor-control peripherals to the standard PIC18 feature set.
Key features of this device include an enhanced 16-bit PWM with dedicated time-base and dead-band control, a 10-bit ADC with up to 5 input channels and programmable acquisition time, and a master synchronous serial port supporting both SPI and I2C master/slave modes. The instruction set is optimized for compiled C code, and the device supports self-programming for in-field firmware updates. An extended temperature grade option ("E" suffix) is qualified for -40C to +125C operation, making the part suitable for industrial and appliance-grade environments.
Typical applications include single-phase induction motor control in washing machines, fans, pumps, and small appliances, where the integrated motor-control kernel eliminates discrete analog/digital conversion stages. Secondary uses include industrial sensor interface boards and HVAC damper/valve controllers, where the 24KB Flash and 1408-byte RAM are sufficient for control-loop firmware plus a small RTOS. The 28-pin SOIC package is widely used in through-hole-reflow-compatible designs and supports standard pick-and-place assembly.
Designers should note that the -E temperature grade variant carries different cost and qualification status than the standard -I (industrial) variant, so confirm the order code matches your application's environmental requirements. For drop-in alternatives and second-source strategies, see the comparison table below; PIC18F2431 and PIC18F2539-I variants share the same 28-pin SOIC footprint but differ in Flash size or temperature grade.
Drop-in alternatives for PIC18F2539-E/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 PIC18F2539-E/SO (same form factor and footprint) — differing in Package, I/O Pins, Core Architecture, Timers, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F2539-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F2539T-I/SO
✅ Drop-In✓ In Stock
$3.82 / Unit
View Datasheet →PIC18F2431-I/SO
✅ Drop-In✓ In Stock
$4.85 / Unit
View Datasheet →PIC18F2431-E/SO
✅ Drop-In✓ In Stock
$4.21 / Unit
View Datasheet →PIC18F2520-I/SO
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →PIC18F2480-I/SO
✅ Drop-In✓ In Stock
$4.13 / Unit
View Datasheet →PIC18F2539-E/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC |
| Series | PIC18F |
| Sub-Family | PIC18FXX39 (motor control) |
| Program Memory Type | Flash |
| Program Memory Size | 24 KB |
| RAM Size | 1408 bytes |
| EEPROM Size | 256 bytes |
| Maximum Clock Frequency | 40 MHz |
| Supply Voltage Range | 4.2 V to 5.5 V |
| I/O Pins | 21 (25 per alternate listing) |
| ADC Channels | 5 |
| ADC Resolution | 10-bit |
| PWM Channels | 2 |
| Communication Interfaces | MSSP (SPI / I2C), USART |
| Package | 28-pin SOIC (0.295 in / 7.50 mm body width) |
| Operating Temperature Range | -40 C to +125 C (E grade, extended) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| In-Circuit Debug | ICD (In-Circuit Debugger) supported |
| Self-Programming | Yes (Flash) |
| Lead-Free | Yes |
PIC18F2539-E/SO Pin Configuration
| Pin 1 | MCLR — Master clear / reset input (active low) |
| Pin 2 | RA0/AN0 — PORTA bit 0 / analog input channel 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / analog input channel 1 |
| Pin 4 | RA2/AN2 — PORTA bit 2 / analog input channel 2 |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input channel 3 / ADC reference plus |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / analog input channel 4 / SPI slave select |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pin 10 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Pin 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 12 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 PWM output |
| Pin 13 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Pin 14 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 15 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 16 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 17 | RC6/TX/CK — PORTC bit 6 / USART transmit / USART clock |
| Pin 18 | RC7/RX/DT — PORTC bit 7 / USART receive / USART data |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage (4.2 V to 5.5 V) |
| 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/INT3 — PORTB bit 3 / external interrupt 3 |
| Pin 25 | RB4 — PORTB bit 4 |
| Pin 26 | RB5 — PORTB bit 5 |
| Pin 27 | RB6/PGC — PORTB bit 6 / ICSP clock (ICD clock) |
| Pin 28 | RB7/PGD — PORTB bit 7 / ICSP data (ICD data) |
Typical Applications
PIC18F2539-E/SO is suitable for 7 applications: Single-Phase Induction Motor Control, HVAC Damper and Valve Actuators, Appliance Control Boards, Industrial Sensor Interface Boards, Pump and Fan Speed Controllers, Small White-Goods Motor Modules, Industrial Compressor Control.
Single-Phase Induction Motor Control
The PIC18F2539-E/SO was designed around single-phase induction motor control, and its integrated motor-control kernel plus dual PWM with programmable dead-band make it a natural fit for washing-machine drum motors, range-hood fans, and small pumps. The 40 MHz core executes field-oriented control loops within the PWM cycle, while the 5-channel 10-bit ADC samples back-EMF and shunt-current feedback. The extended -40 C to +125 C temperature grade tolerates the elevated ambient found behind washing-machine rear panels. The 24 KB Flash and 1408-byte RAM are sufficient for control firmware plus startup, fault-recovery, and UART diagnostic stacks.
Recommended
HVAC Damper and Valve Actuators
In HVAC damper and valve actuator modules, the PIC18F2539-E/SO provides just enough Flash and RAM to run a control loop driving a small BLDC motor through the dual PWM outputs. Its 10-bit ADC captures analog damper-position feedback from a potentiometer or Hall-effect sensor, while the USART links to a Modbus or BACnet supervisory network. The extended -E temperature grade is essential for rooftop equipment exposed to direct sun, where ambient can exceed 85 C inside an actuator housing. The 28-pin SOIC package supports standard surface-mount assembly, simplifying the BOM.
Recommended
Appliance Control Boards
Appliance control boards for dishwashers, dryers, and microwave ovens benefit from the PIC18F2539-E/SO's motor-control kernel plus the on-chip USART and MSSP peripherals. The 24 KB Flash fits a typical appliance UI state machine with sensor-fault detection, while 1408 bytes of RAM is enough to buffer a keypad scan plus display refresh. The -40 C to +125 C temperature grade allows direct placement near the appliance heating element without thermal derating. The 28-pin SOIC package is hand-solderable for prototype builds.
Recommended
Industrial Sensor Interface Boards
Industrial sensor interface boards that aggregate analog and digital sensor data onto a Modbus or CAN bus can use the PIC18F2539-E/SO as a local protocol translator. The 5-channel 10-bit ADC reads thermocouples, pressure transducers, or strain gauges, while the MSSP peripheral drives an SPI sensor or I2C ADC. The 24 KB Flash supports a small RTOS or interrupt-driven scheduler. The extended temperature grade lets the board live inside a sealed industrial enclosure without an additional heater. The 28-pin SOIC footprint is shared with many PIC18F family parts for design reuse.
Recommended
Pump and Fan Speed Controllers
The PIC18F2539-E/SO drives variable-speed pump and fan controllers in HVAC and process-control systems. Its dual PWM outputs with dead-band control feed the gate drivers for the power-stage IGBTs or MOSFETs that switch the motor windings, while the ADC monitors the motor current for closed-loop torque control. The extended -E temperature grade accommodates outdoor-mounted pump and fan enclosures in summer ambient conditions. The 1408-byte RAM supports a software PLL between the supply frequency and the drive PWM without external logic.
Recommended
Small White-Goods Motor Modules
Small white-goods motor modules for refrigerators, freezers, and microwave turntable drives use the PIC18F2539-E/SO because of its small SOIC footprint and low power consumption. The motor-control PWM directly drives the low-voltage BLDC or single-phase induction motor, while the integrated 10-bit ADC closes the loop on speed feedback. The 24 KB Flash fits the appliance-specific safety logic plus a small bootloader for field firmware updates. The extended -40 C to +125 C temperature grade is essential inside refrigerator compressor compartments.
Recommended
Industrial Compressor Control
Industrial compressor control modules for refrigeration and air-conditioning equipment leverage the PIC18F2539-E/SO's motor-control kernel and PWM dead-band to drive hermetic compressor motors. The extended temperature grade handles the elevated ambient inside compressor cabinets, while the 5-channel ADC reads suction and discharge pressures plus motor current. The 24 KB Flash supports compressor-specific protection logic including anti-short-cycle timers and crankcase heater control, and the 1408-byte RAM handles the compressor state machine. The 28-pin SOIC supports standard PCB reflow assembly.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F2539-E/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F2539-I/SO | PIC18F2539T-I/SO | PIC18F2431-I/SO | PIC18F2520-I/SO | PIC18F2480-I/SO |
|---|---|---|---|---|---|---|
| Package | 28-pin SOIC (7.50 mm) | 28-pin SOIC (7.50 mm) - same | 28-pin SOIC (7.50 mm) - same | 28-pin SOIC (7.50 mm) - same | 28-pin SOIC (7.50 mm) - same | 28-pin SOIC (7.50 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 24 KB | 24 KB | 24 KB | 16 KB | 32 KB | 16 KB |
| RAM | 1408 bytes | 1408 bytes | 1408 bytes | 768 bytes | 1536 bytes | 768 bytes |
| Maximum Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| ADC Channels / Resolution | 5 / 10-bit | 5 / 10-bit | 5 / 10-bit | 5 / 10-bit | 10 / 10-bit | 8 / 10-bit |
| PWM Channels | 2 (with motor-control kernel) | 2 (with motor-control kernel) | 2 (with motor-control kernel) | 2 (with motor-control kernel) | 2 (standard CCP, no motor-control kernel) | 2 (standard CCP, no motor-control kernel) |
| Operating Temperature Grade | Extended -40C to +125C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C |
| Special Features | Motor-control kernel, ICD, self-programming | Same as this product, -I grade | Same die, tape-and-reel packaging | Same motor-control kernel, smaller memory | No motor-control kernel, more Flash and ADC | Adds CAN 2.0B peripheral |
| Supply Voltage Range | 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 |
Key Differentiators
- Integrated motor-control kernel with dead-band PWM (vs PIC18F2520-I/SO)
- Extended -40 C to +125 C temperature grade (vs PIC18F2539-I/SO)
- Optimized 24 KB Flash size for motor firmware (vs PIC18F2431-I/SO)
Design Notes
The PIC18F2539-E/SO operates from a single 4.2 V to 5.5 V supply. Place a 100 nF decoupling capacitor within 10 mm of the VDD pin (pin 20) and a 10 uF bulk capacitor close to the package. For motor-control applications, isolate the digital VDD rail from the analog AVdd supply (or tie both to VDD on this 28-pin part) and star-ground the supply return to the shunt current-sense resistor. Estimated: total supply current at 40 MHz is approximately 25 mA plus I/O drive.
At 40 MHz with all peripherals active, the PIC18F2539-E/SO dissipates roughly 125 mW worst case, well within the SOIC thermal envelope. For the -E grade qualified to +125 C, design for at most a 20 C self-heating rise at 85 C ambient to stay within the operating-temperature envelope. Ensure the PCB copper pour under the SOIC body is at least 100 mm squared for the recommended thermal pad layout.
Do not exceed 40 MHz on the system clock - operation above 40 MHz violates the PIC18F2539 spec. Do not leave the MCLR pin floating; tie it to VDD through a 10 kohm pull-up with a 100 nF cap to ground for proper reset. The MSSP peripheral must be configured for SPI or I2C mode before use; leaving it uninitialized can leave pins in an undetermined state. Estimated: firmware Flash write endurance is rated at 10K cycles minimum per Microchip datasheet; use EEPROM for parameters that change frequently.
Route the analog ADC inputs (RA0-RA5) away from the PWM outputs (RC1, RC2) to avoid coupling switching noise into ADC samples. Use a ground guard trace around the analog input traces tied back to a clean analog ground. Keep the OSC1/OSC2 crystal traces short and symmetric, and place the load capacitors within 5 mm of the pins. The 28-pin SOIC supports standard 1.27 mm pitch routing without micro-vias.
Compliance Information
RoHS and lead-free per Microchip product page. Not AEC-Q100 qualified - the -E temperature grade is industrial extended, not automotive.
