PIC18F2539-I/SP - 40MHz 8-bit MCU 24KB Flash Motor Control | Microchip
MPN: PIC18F2539-I/SP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.85 | $6.85 |
| 10 | $6.12 | $61.20 |
| 100 | $5.18 | $518.00 |
| 500 | $4.45 | $2,225.00 |
| 1,000 | $3.92 | $3,920.00 |
PIC18F2539-I/SP Overview
An 8-bit microcontroller (MCU) is a programmable processor built around an 8-bit data path, instruction-fetch architecture, on-chip non-volatile program memory, RAM, and mixed analog/digital peripherals. Within the broader semiconductor hierarchy, an MCU sits below microprocessors (which usually need external memory and peripherals) and above purely digital logic ICs; it is the workhorse of embedded control. The PIC18F family in particular targets applications requiring deterministic interrupt latency and on-board motor-control hardware rather than raw CPU throughput, and is classified as a microcontrollers -> Integrated Circuits category device.
Key features include 21 digital I/O pins arranged across multiple ports, three 16-bit timers plus the motor-control PWMs, an enhanced CCP module for full-bridge or half-bridge drive, a 10-bit multi-channel A/D converter, USART with LIN support, an I2C/SPI MSSP peripheral, and an internal 8 MHz oscillator with PLL options. Programmable BOR and LVD enhance robustness in electrically noisy motor environments, while the ICD/ICSP debug interface accelerates firmware bring-up using Microchip's MPLAB X IDE and MPLAB XC8 toolchain.
Architecturally the part uses a Harvard-style 16-bit instruction / 8-bit data path with a hardware multiplier and a hardware stack that supports C-compiler generated code, while the motor-control PWM block provides complementary outputs with programmable dead-band, fault inputs, and trigger-to-ADC synchronization that simplifies current-sense timing. The integrated single-phase induction motor control kernel allows field-oriented style control in software without external DSP hardware.
Typical applications include single-phase induction motor control (washing machines, pumps, fans), appliance control boards, HVAC blowers, compact low-cost variable-frequency drives, and general-purpose 5 V/3.3 V embedded control with on-board ADC and PWM. The SPDIP-28 package suits through-hole designs and prototyping where easy rework is preferred over SMT density.
Design consideration: choose this device when you need integrated single-phase induction motor firmware primitives and an SPDIP footprint; for SMT-only designs evaluate the SOIC-28 (-I/SO) variant or a QFN-packaged PIC18F motor-control part. Adequate decoupling (100 nF + bulk) and a stable LDO feeding AVDD are required for accurate ADC readings.
This page consolidates distributor pricing, drop-in PIC18F-family alternatives in the same SPDIP-28 footprint, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC18F2539-I/SP — 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-I/SP (same form factor and footprint) — differing in ADC, Operating Temperature, Package, I/O Pins, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F2439-I/SP
✅ Drop-In✓ In Stock
$5.05 / Unit
View Datasheet →PIC18F2539-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F2539-E/SP
✅ Drop-In✓ In Stock
$3.05 / Unit
View Datasheet →PIC18F2480-I/SP
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →PIC18F2455-I/SP
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →PIC18F2515-I/SP
✅ Drop-In✓ In Stock
$5 / Unit
View Datasheet →PIC18F2539-I/SP Maximum Ratings & Electrical Characteristics
| Device Family | PIC18F |
| Core | 8-bit PIC18 RISC |
| Program Memory Type | FLASH |
| Program Memory Size | 24 KB (12K x 16) |
| RAM | 1408 bytes |
| Maximum CPU Frequency | 40 MHz |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| Operating Temperature | -40C to +85C (industrial, I) |
| Number of I/O Pins | 21 |
| ADC | 10-bit, multi-channel |
| Motor Control Kernel | Single-phase induction motor control (Power Control PWM) |
| Timers | Three 16-bit + motor-control PWM timer |
| Communication Peripherals | USART (LIN), MSSP (I2C/SPI), Enhanced CCP/ECCP |
| Package | SPDIP-28 (SP), 28-pin, 0.300" (7.62 mm) lead pitch |
| Mounting Type | Through-Hole (DIP) |
PIC18F2539-I/SP Pin Configuration
| Pin 1 | MCLR/VPP/RE3 — Master Clear (reset) / programming voltage / digital input only |
| Pin 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / ADC VREF- |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC VREF+ |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4 — PORTA bit 5 / analog input 4 |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKI/RA7 — Crystal oscillator input / external clock / PORTA bit 7 |
| Pin 10 | OSC2/CLKO/RA6 — Crystal oscillator output / clock output / PORTA bit 6 |
| Pin 11 | RC0/T1CKI — PORTC bit 0 / Timer1 clock input |
| Pin 12 | RC1 — PORTC bit 1 |
| Pin 13 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Pin 14 | RC3 — PORTC bit 3 |
| Pin 15 | RC4 — PORTC bit 4 |
| Pin 16 | RC5 — PORTC bit 5 |
| Pin 17 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Pin 18 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage |
| 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 — PORTB bit 3 |
| Pin 25 | RB4 — PORTB bit 4 |
| Pin 26 | RB5 — PORTB bit 5 |
| Pin 27 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 28 | RB7/PGD — PORTB bit 7 / ICSP data |
Typical Applications
PIC18F2539-I/SP is suitable for 6 applications: Single-Phase Induction Motor Drive, Washing Machine Control Board, HVAC Fan / Blower Speed Controller, Small Pumps and Compressors, Appliance UI and Sensor Front-End, Industrial 5 V Embedded Control.
Single-Phase Induction Motor Drive
The PIC18F2539-I/SP is Microchip's reference MCU for single-phase induction motor control because its integrated Power Control PWM kernel provides complementary outputs with programmable dead-band, dedicated fault inputs, and ADC trigger synchronization needed for current-mode torque control. At 40 MHz / 10 MIPS the part closes the speed loop in real time while leaving CPU headroom for UI, sensor conditioning and safety routines. With 24 KB FLASH and 1408 RAM the device fits sensorless V/Hz control plus housekeeping code for small compressors, pumps and fans without external memory. The integrated 10-bit ADC samples shunt current and back-EMF at the PWM center-point to maximize noise rejection. Designers benefit from MPLAB X IDE code configurators and motor-control application notes that shorten time-to-prototype.
Recommended
Washing Machine Control Board
Washing machine controllers demand deterministic motor actuation plus HMI, water-level sensing and safety supervision. The PIC18F2539-I/SP supplies a 10-bit ADC for level and temperature sensing, USART for the display/keypad board, and the Power Control PWM block that drives the drum and drain pump with synchronized dead-band timing. The 24 KB FLASH accommodates drum-pattern firmware, fault logging and a UI state machine in a single chip. Operating from 2.0 V to 5.5 V lets the board run from a 5 V LDO fed by the main 110/220 V rectified rail, with brown-out-reset protecting against AC dropouts. The SPDIP-28 footprint simplifies manual rework in production-line repair situations common for white-goods service.
Recommended
HVAC Fan / Blower Speed Controller
Variable-speed HVAC blowers require quiet PWM commutation, closed-loop RPM regulation, and clean line-voltage isolation. The PIC18F2539-I/SP produces a 20 kHz+ switching PWM that keeps fan noise out of the audible band while the 10-bit ADC reads tachometer pulses or back-EMF for closed-loop speed control. With 24 KB FLASH the device supports soft-start profiles, sleep mode for energy compliance, and serial LIN communication to the system controller (USART with LIN). The -40C to +85C industrial temperature rating covers attic, basement and rooftop HVAC environments. The SPDIP-28 package is well-suited to the through-hole manufacturing used in many HVAC control boards.
Recommended
Small Pumps and Compressors
Small single-phase pumps and compressors (water boosters, refrigerator compressors, oil burners) need motor PWM plus pressure and flow feedback loops. The PIC18F2539-I/SP's 21 I/O pins handle multiple pressure switches, thermistor inputs and relay outputs while its Power Control PWM drives triac or IGBT half-bridge stages. The 1408-byte RAM is sufficient for a 50 Hz control loop plus setpoint averaging. Built-in BOR/LVD circuitry prevents MCU latch-up during line-voltage dips on the DC supply, increasing reliability of unattended pump installations. Industrial -40C to +85C operation supports outdoor pool, agricultural and refrigeration duty.
Recommended
Appliance UI and Sensor Front-End
Beyond pure motor control, the PIC18F2539-I/SP also serves as the UI controller in mid-tier appliances with a 7-segment display, keypad and NTC sensors. The MSSP peripheral drives LED drivers or LCD controllers via SPI, the USART links to inverter modules, and the 10-bit ADC reads multiple temperature sensors. With 24 KB FLASH the part can host capacitive-touch firmware and EEPROM-emulated user settings without external memory. The 40 MHz CPU keeps display-refresh jitter under 5 ms even when servicing multiple I/O events, important for a responsive user experience.
Recommended
Industrial 5 V Embedded Control
Many industrial control boards still rely on 5 V logic for sensor interfaces and noise immunity. The PIC18F2539-I/SP runs directly from 5 V, eliminating the need for level shifters on 5 V gate-driver or sensor front-end stages. Its 21 I/O plus the integrated ADC, PWM, USART (with LIN), MSSP and ECCP make it a flexible general-purpose controller for conveyor indexes, packaging machines, and laboratory automation. ICSP/ICD support allows in-system firmware updates during commissioning. The 24 KB FLASH and 1408 RAM provide enough space for PID, sequencer and logging firmware in 5 V industrial environments.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F2539-I/SP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F2439-I/SP | PIC18F2539-I/SO | PIC18F2539-E/SP | PIC18F2480-I/SP | PIC18F2455-I/SP |
|---|---|---|---|---|---|---|
| Package | SPDIP-28 (SP) | SPDIP-28 (SP) - same | SPDIP-28 (SP) - same | SPDIP-28 (SP) - same | SPDIP-28 (SP) - same | SPDIP-28 (SP) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program FLASH | 24 KB | 12 KB (-50%) | 24 KB (same) | 24 KB (same) | 16 KB (-33%) | 24 KB (same) |
| CPU Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 48 MHz (USB clock) |
| RAM | 1408 bytes | 768 bytes (-45%) | 1408 bytes (same) | 1408 bytes (same) | 768 bytes (-45%) | 2048 bytes (+45%) |
| Motor Control Kernel | Yes (single-phase induction) | Yes (single-phase induction) | Yes (same) | Yes (same) | No (general-purpose, has CAN) | No (has USB 2.0 FS) |
| Operating Temperature | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +125C (E) | -40C to +85C (I) | -40C to +85C (I) |
| Key Differentiator | Reference single-phase motor MCU, 24 KB FLASH | Cost-down (12 KB FLASH) | Same die, tape and reel | Extended temp grade (125C) | Adds CAN bus | Adds USB 2.0 FS |
Key Differentiators
- Integrated single-phase induction motor control kernel (vs PIC18F2455-I/SP)
- Doubles the FLASH of the cost-down sibling (vs PIC18F2439-I/SP)
- Industrial -40C to +85C variant plus extended -40C to +125C option (vs PIC18F2539-E/SP)
Design Notes
Place a 100 nF ceramic decoupling capacitor as close as possible to each VDD pin and a 10 uF bulk capacitor on the board's main 5 V or 3.3 V rail. For ADC accuracy use a separate AVDD filter (ferrite bead + 100 nF + 10 uF) feeding the AVSS-returned analog supply. Brown-out-reset (BOR) must be enabled in the configuration words to prevent code corruption during AC brown-outs on appliance supplies.
The PIC18F2539-I/SP SPDIP-28 has typical theta_JA around 70 C/W, which is normally sufficient for MCU-only designs. Estimated: at 40 MHz / 5 V with all peripherals active, total chip power is ~50 mW, giving ~3.5 C temperature rise above ambient - no heatsink required. If the SPDIP-28 sits next to a hot power component (rectifier, transformer), keep 10 mm clearance to limit PCB heat soak.
Configuration-word mistakes are the most common source of dead PIC18F2539 units. Always set the oscillator mode (HS for >4 MHz crystal), disable the watchdog only if your application does not need it, and reserve the ICD pins (RB6/RB7) for ICSP unless the design tolerates the alternate PORTB function. The single-phase motor-control PWM module requires the PWM time-base to be configured before the output pins are enabled; otherwise the outputs stay in the inactive state and the motor never starts.
Route the analog ADC traces (RA0-RA5) away from PWM switching traces (RC2/CCP1, ECCP outputs) and the oscillator pins. Place the crystal within 5 mm of OSC1/OSC2 with a grounded guard ring. Use a 4-layer PCB or a dedicated ground plane if switching currents exceed 1 A; otherwise 2-layer with a ground pour is acceptable for sub-500 mA motor drives.
Compliance Information
RoHS and REACH status confirmed by Microchip product page and EU distributor listings. Not AEC-Q100 qualified - choose PIC18F automotive-grade (/-Q) variants for vehicle applications. Lead-free reflow profile is per JEDEC J-STD-020.
