PIC18F2439-I/SP - 8-bit Motor Control MCU, 12KB Flash | Microchip
MPN: PIC18F2439-I/SP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.95 | $7.95 |
| 10 | $7.16 | $71.60 |
| 100 | $6.37 | $637.00 |
| 500 | $5.71 | $2,855.00 |
| 1,000 | $5.05 | $5,050.00 |
PIC18F2439-I/SP Overview
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path; the PIC18 family extends Microchip's baseline PIC16 architecture with a 16-bit instruction word, hardware multiplier, and linear (paged) memory map for higher code density. Within the broader taxonomy, the PIC18F2439 belongs to the PIC18F2xxx motor-control sub-family, which itself falls under the PIC18F high-performance group and ultimately under Microchip's 8-bit MCU portfolio. Engineers select this class when deterministic interrupt response, on-chip motor-control peripherals, and C-compiler friendly development outweigh the throughput advantage of 16-bit or 32-bit cores.
Key features include the dedicated single-phase induction motor (SPIM) control kernel with auto-commutation, two 10-bit PWM channels with complementary outputs, a 10-bit ADC with 200 ksps conversion rate, nanoWatt power-saving modes, and ICD (In-Circuit Debugger) support. The 28-pin SPDIP package provides through-hole ease-of-prototyping while sharing the same silicon as the SOIC variant, allowing PCB layout reuse for production runs.
The PIC18F2439 uses a Harvard RISC architecture with a 16-bit instruction word and an 8-bit data path, achieving most instructions in a single 4-cycle clock. On-chip peripherals are mapped through a linear SFR bank, and self-programming Flash enables in-application firmware upgrades. The motor-control kernel handles back-EMF zero-cross detection and auto-commutation timing in hardware, offloading critical loop tasks from the CPU.
Typical applications include single-phase induction motor drives (washing machines, fans, pumps), appliance controls, ceiling-fan regulators, small HVAC blowers, and low-cost variable-speed tools. The wide 4.2 V to 5.5 V supply range allows direct operation from rectified 5 V rails. In production designs, the SOIC variant (PIC18F2439-I/SO) is preferred for SMT assembly while the SPDIP variant is reserved for breadboard and lab prototyping.
Drop-in alternatives for PIC18F2439-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 PIC18F2439-I/SP (same form factor and footprint) — differing in ADC, I/O Pins, PWM Channels, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F2431-I/SP
✅ Drop-In✓ In Stock
$5.49 / Unit
View Datasheet →PIC18F2331-I/SP
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F2439-I/SP Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC18 RISC |
| Program Memory (Flash) | 12 KB |
| SRAM | 640 bytes |
| EEPROM | 256 bytes |
| Maximum Clock Speed | 40 MHz |
| Instruction Throughput | 10 MIPS |
| Supply Voltage | 4.2 V to 5.5 V |
| I/O Pins | 21 |
| ADC | 10-bit, multiple channels |
| PWM Channels | 2 (with complementary outputs) |
| Motor Control Kernel | Single-phase induction motor (SPIM) |
| Package | 28-pin SPDIP (Skinny Plastic DIP) |
| Mounting Type | Through-Hole |
| Operating Temperature | -40 C to +85 C (Industrial) |
| In-Circuit Debug | ICD support |
| RoHS Status | Compliant |
PIC18F2439-I/SP Pin Configuration
| Pin 1 | MCLR — Master Clear (Reset) input, active low |
| Pin 2 | RA0 — PORTA bit 0 (digital I/O or analog input) |
| Pin 3 | RA1 — PORTA bit 1 (digital I/O or analog input) |
| Pin 4 | RA2 — PORTA bit 2 (digital I/O or analog input) |
| Pin 5 | RA3 — PORTA bit 3 (digital I/O or analog input) |
| Pin 6 | RA4 — PORTA bit 4 (digital I/O or analog input) |
| Pin 7 | RA5 — PORTA bit 5 (digital I/O or analog input) |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1 — Oscillator input / external clock input |
| Pin 10 | OSC2 — Oscillator output |
| Pin 11 | RC0 — PORTC bit 0 (digital I/O or timer I/O) |
| Pin 12 | RC1 — PORTC bit 1 (digital I/O or PWM output) |
| Pin 13 | RC2 — PORTC bit 2 (digital I/O or PWM output) |
| Pin 14 | RC3 — PORTC bit 3 (digital I/O or PWM output) |
| Pin 15 | RC4 — PORTC bit 4 (digital I/O or PWM output) |
| Pin 16 | RC5 — PORTC bit 5 (digital I/O or PWM output) |
| Pin 17 | RC6 — PORTC bit 6 (digital I/O or TX/CK) |
| Pin 18 | RC7 — PORTC bit 7 (digital I/O or RX/DT) |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage (4.2V to 5.5V) |
| Pin 21 | RB0 — PORTB bit 0 (digital I/O, interrupt-on-change) |
| Pin 22 | RB1 — PORTB bit 1 (digital I/O, interrupt-on-change) |
| Pin 23 | RB2 — PORTB bit 2 (digital I/O, interrupt-on-change) |
| Pin 24 | RB3 — PORTB bit 3 (digital I/O, interrupt-on-change) |
| Pin 25 | RB4 — PORTB bit 4 (digital I/O, interrupt-on-change) |
| Pin 26 | RB5 — PORTB bit 5 (digital I/O, interrupt-on-change) |
| Pin 27 | RB6 — PORTB bit 6 (digital I/O, ICD clock) |
| Pin 28 | RB7 — PORTB bit 7 (digital I/O, ICD data) |
Typical Applications
PIC18F2439-I/SP is suitable for 6 applications: Single-Phase Induction Motor Drive, Ceiling Fan Speed Regulator, Appliance Pump Controller, HVAC Blower Motor Control, Power Tool Speed Controller, Small Inverter / UPS Fan Drive.
Single-Phase Induction Motor Drive
The PIC18F2439-I/SP is purpose-built for single-phase induction motor (SPIM) control in appliances such as washing-machine drum motors, ceiling fans, small pumps, and HVAC blowers. Its dedicated motor-control kernel performs back-EMF zero-cross detection and auto-commutation in hardware, eliminating the CPU overhead that would otherwise force a faster (and more expensive) MCU. The two complementary-output PWM channels with programmable dead-band drive a TRIAC or half-bridge stage directly, and the 10-bit ADC samples shunt-current and line-voltage feedback at up to 200 ksps for closed-loop speed regulation. Choosing the -I/SP (SPDIP-28) variant specifically simplifies breadboard prototyping and field-replacement servicing.
Recommended
Ceiling Fan Speed Regulator
The PIC18F2439-I/SP's 21 I/O pins and integrated motor-control peripherals make it a natural fit for ceiling-fan regulators that replace traditional capacitor-based step controllers. The MCU drives a TRIAC through an opto-isolated gate, senses RPM via a Hall or back-EMF tap on the auxiliary winding, and provides soft-start ramps that reduce acoustic noise and mechanical stress. The 4.2-5.5 V supply range allows direct operation from rectified mains via a small capacitive dropper or linear regulator. The -I/SP SPDIP package is well suited to the through-hole PCB layouts common in ceiling-fan wall modules.
Recommended
Appliance Pump Controller
Dishwasher and washing-machine drain pumps demand precise variable-speed control to reduce noise and water hammer. The PIC18F2439-I/SP runs the closed-loop PID at 10 MIPS, while its motor-control kernel handles the TRIAC firing-angle math, freeing CPU cycles for safety diagnostics and user-interface LEDs. The 256-byte EEPROM stores calibration constants, and the 640-byte SRAM is sufficient for control-loop buffers without external memory. Its 28-pin SPDIP footprint is compatible with the through-hole assemblies used in appliance control boards.
Recommended
HVAC Blower Motor Control
Variable-speed HVAC blowers benefit from the PIC18F2439-I/SP's deterministic interrupt response and on-chip motor-control peripherals. The MCU drives a TRIAC or back-to-back SCR pair, reads temperature sensors through its 10-bit ADC, and modulates blower speed to maintain set-point airflow. The nanoWatt power-saving modes reduce standby consumption below 1 µA when the system is idle, helping meet Energy Star requirements. The -I/SP through-hole package simplifies in-field service replacements in legacy HVAC equipment.
Recommended
Power Tool Speed Controller
Handheld power tools such as drills, screwdrivers, and small saws use universal series-wound or single-phase induction motors that benefit from closed-loop RPM regulation. The PIC18F2439-I/SP reads back-EMF via its ADC, computes load-compensated firing angles, and modulates a TRIAC to maintain target RPM under varying mechanical load. Its 10 MIPS throughput handles the 1-ms control loop comfortably while leaving headroom for trigger-input debouncing and over-temperature protection. The ICD support allows in-circuit firmware tuning during development.
Recommended
Small Inverter / UPS Fan Drive
Low-power UPS and inverter systems use 12 V or 24 V brushless DC and single-phase AC fans for cooling; the PIC18F2439-I/SP can drive both fan types by reconfiguring its PWM and ADC channels. The 4.2-5.5 V supply rails directly off the inverter's logic rail, eliminating an auxiliary converter. The dedicated motor-control kernel simplifies fan-tachometer feedback handling and stall detection, which improves reliability in unattended UPS installations. The SPDIP package aids servicing in field-replaceable fan modules.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F2439-I/SP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F2431-I/SP | PIC18F2331-I/SP | PIC18F4550-I/P |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SPDIP-28 | SPDIP-28 - same | SPDIP-28 - same | PDIP-40 - not compatible |
| Flash Memory | 12 KB | 16 KB | 8 KB | 32 KB |
| SRAM | 640 B | 640 B | 640 B | 2048 B |
| EEPROM | 256 B | 256 B | 256 B | 256 B |
| Max Clock | 40 MHz | 40 MHz | 40 MHz | 48 MHz |
| I/O Pins | 21 | 21 | 21 | 35 |
| ADC | 10-bit | 10-bit | 10-bit | 10-bit |
| PWM Channels | 2 | 2 | 2 | 2 (plus CCP) |
| Motor Control Kernel | SPIM (single-phase IM) | SPIM (single-phase IM) | SPIM (single-phase IM) | None (general purpose) |
| Supply Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V |
Key Differentiators
- Dedicated single-phase induction motor (SPIM) control kernel (vs PIC18F4550-I/P)
- Right-sized Flash for cost-sensitive motor control (vs PIC18F2431-I/SP)
- Through-hole SPDIP package for prototyping (vs PIC18F2439-I/SO)
Design Notes
The PIC18F2439-I/SP requires a stable 4.2 V to 5.5 V supply. Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of the VDD pin, plus a bulk 10 µF electrolytic or tantalum on the same rail. In noisy motor environments, add a ferrite bead or LC filter on the incoming VDD line to suppress TRIAC dv/dt transients coupling into the MCU supply.
Keep the ICSP/ICD pins (RB6/RB7 and MCLR) accessible in production layouts; Microchip programmers require these even on assembled boards for in-system firmware updates. Route the oscillator traces short and surrounded by ground pour to minimize EMI pickup from the motor switching nodes. Place the MCLR pull-up (typically 10 kΩ) close to the MCU pin.
When sampling back-EMF or shunt current with the 10-bit ADC, place a small RC anti-aliasing filter (typically 1 kΩ + 100 pF) at each analog input. Synchronize ADC conversions to the PWM period to avoid sampling during switching transients. The motor-control kernel's zero-cross detector expects filtered analog signals - excessive noise causes false triggers and motor commutation errors.
Estimated: EEPROM write endurance is 1 million cycles minimum per datasheet - implement wear-leveling for parameters updated frequently (RPM set-points, calibration). Brown-out Reset (BOR) must be enabled in configuration bits; without it, slow VDD rise times can corrupt program counter and cause erratic behavior. The 'I' suffix denotes industrial temperature grade (-40 to +85 °C); 'E' is extended (-40 to +125 °C) and not interchangeable for harsh environments.
Compliance Information
RoHS and REACH compliant per Microchip product environmental compliance documentation. Industrial temperature grade (-40 to +85 °C). Not AEC-Q100 qualified - automotive motor-control applications should use AEC-Q100 qualified parts from Microchip's automotive portfolio.
