PIC18LF4439-I/P - 8-Bit 40MHz MCU 12KB Flash 40-PDIP | Microchip
MPN: PIC18LF4439-I/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.2 | $7.20 |
| 10 | $6.5 | $65.00 |
| 100 | $5.78 | $578.00 |
| 500 | $5.2 | $2,600.00 |
| 1,000 | $4.65 | $4,650.00 |
PIC18LF4439-I/P Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripherals on a single die. The PIC18F family uses a Harvard-architecture RISC core with a 16-bit instruction word and 8-bit data path, sitting in the broader semiconductor hierarchy of microcontroller -> embedded processor -> semiconductor device. The 'LF' prefix designates low-voltage operation (typically 2.0V-3.6V), enabling battery-powered and portable designs where standard 5V PIC18F parts would be unsuitable.
Key features include a 10-bit ADC with up to 8 channels, multiple PWM outputs suitable for motor control, a USART, MSSP (SPI/I2C), capture/compare/PWM modules, and dual analog comparators. The PIC18LF4439 also includes special motor-control peripherals, notably the Power Control PWM module and quadrature encoder interface, distinguishing it within the PIC18F lineup for motion-control applications.
The architecture uses a Harvard-memory RISC core with hardware multiplier and 32-level stack, achieving up to 10 MIPS throughput at 40 MHz. The integrated motor-control PWM block delivers up to 14-bit resolution with center-aligned or edge-aligned modes, supporting complementary outputs with programmable dead-time insertion - a feature targeted at three-phase inverter designs. The 10-bit ADC with dual Sample-and-Hold enables simultaneous voltage and current sensing in FOC (field-oriented control) loops.
Typical applications include BLDC motor control (single/three-phase), industrial drives, HVAC fan/blower controllers, home automation, low-power sensor platforms, and battery-powered instrumentation where the wide 2.0V-3.6V operating range is critical.
When designing with this device, ensure proper decoupling (100 nF + 10 uF near VDD/AVDD pins) and that the MCLR pin is tied through a pull-up resistor with the standard ICSP layout for in-circuit serial programming retention.
This page synthesizes distributor pricing, drop-in alternatives, parametric comparisons, and practical design notes for the PIC18LF4439-I/P that are not collated in the manufacturer datasheet alone.
Drop-in alternatives for PIC18LF4439-I/P — 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 PIC18LF4439-I/P (same form factor and footprint) — differing in Core Architecture, Mounting Type, ADC, Operating Temperature, Package Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF4439-I/ML
✅ Drop-In✓ In Stock
$5.85 / Unit
View Datasheet →PIC18F4439-I/PT
✅ Drop-In✓ In Stock
$5.05 / Unit
View Datasheet →PIC18LF4331-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF4439-E/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF4439-I/P Maximum Ratings & Electrical Characteristics
| Manufacturer | Microchip Technology |
| Series | PIC 18F |
| Core Architecture | 8-bit RISC Harvard |
| Core Processor | PIC |
| Core Speed | 40 MHz |
| Program Memory Type | FLASH |
| Program Memory Size | 12 KB (6 K x 16) |
| RAM Size | 640 bytes |
| Number of I/O Pins | 32 |
| Number of Terminals | 40 |
| Package Type | 40-PDIP (DIP-40) |
| Package Code | PDIP |
| Terminal Form | Through-Hole |
| Temperature Grade | Industrial |
| Operating Temperature | -40C to +85C |
| Supply Voltage Range (LF) | 2.0 V to 3.6 V |
| Mounting Type | Through-Hole |
| RoHS Status | Compliant |
PIC18LF4439-I/P Pin Configuration
| Pin 1 | MCLR — Master Clear (Reset) input, active low |
| Pin 2 | RA0/AN0 — Digital I/O / Analog input 0 |
| Pin 3 | RA1/AN1 — Digital I/O / Analog input 1 |
| Pin 4 | RA2/AN2 — Digital I/O / Analog input 2 |
| Pin 5 | RA3/AN3 — Digital I/O / Analog input 3 |
| Pin 6 | RA4/AN4 — Digital I/O / Analog input 4 |
| Pin 7 | RA5/AN5 — Digital I/O / Analog input 5 |
| Pin 8 | RE0/RD — Digital I/O / Parallel Slave Port |
| Pin 9 | RE1/WR — Digital I/O / Parallel Slave Port |
| Pin 10 | RE2/CS — Digital I/O / Parallel Slave Port |
| Pin 11 | VDD — Positive supply voltage (2.0V-3.6V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKI — Crystal input / External clock in |
| Pin 14 | OSC2/CLKO — Crystal output / Clock out |
| Pin 15 | RC0 — Digital I/O / PWM output |
| Pin 16 | RC1 — Digital I/O / PWM output |
| Pin 17 | RC2 — Digital I/O / PWM output |
| Pin 18 | RC3 — Digital I/O / PWM output |
| Pin 19 | RD0/PSP0 — Digital I/O / Parallel Slave Port |
| Pin 20 | RD1/PSP1 — Digital I/O / Parallel Slave Port |
| Pin 21 | RD2/PSP2 — Digital I/O / Parallel Slave Port |
| Pin 22 | RD3/PSP3 — Digital I/O / Parallel Slave Port |
| Pin 23 | RC4 — Digital I/O / PWM output |
| Pin 24 | RC5 — Digital I/O / PWM output |
| Pin 25 | RC6 — Digital I/O / PWM output |
| Pin 26 | RC7 — Digital I/O / PWM output |
| Pin 27 | RD4/PSP4 — Digital I/O / Parallel Slave Port |
| Pin 28 | RD5/PSP5 — Digital I/O / Parallel Slave Port |
| Pin 29 | RD6/PSP6 — Digital I/O / Parallel Slave Port |
| Pin 30 | RD7/PSP7 — Digital I/O / Parallel Slave Port |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply voltage (2.0V-3.6V) |
| Pin 33 | RB0/INT0 — Digital I/O / External Interrupt 0 |
| Pin 34 | RB1/INT1 — Digital I/O / External Interrupt 1 |
| Pin 35 | RB2/INT2 — Digital I/O / External Interrupt 2 |
| Pin 36 | RB3/INT3 — Digital I/O / External Interrupt 3 |
| Pin 37 | RB4 — Digital I/O |
| Pin 38 | RB5 — Digital I/O |
| Pin 39 | RB6/PGC — Digital I/O / ICSP Clock |
| Pin 40 | RB7/PGD — Digital I/O / ICSP Data |
Typical Applications
PIC18LF4439-I/P is suitable for 7 applications: BLDC Motor Control, Industrial HVAC Fan Control, Battery-Powered Sensor Hub, Home Automation Controllers, Pump and Valve Actuators, Educational and Hobby Electronics, Automotive Aftermarket Accessories.
BLDC Motor Control
The PIC18LF4439-I/P is engineered for BLDC motor control. Its integrated Power Control PWM module with up to 14-bit resolution, complementary outputs, programmable dead-time, and fault input eliminates external motor-control ASICs. The 10-bit ADC with dual sample-and-hold enables simultaneous phase current sensing in FOC loops, while the quadrature encoder interface supports sensored position feedback. Operating from 2.0V-3.6V, it fits battery-powered E-bike and cordless tool designs where standard 5V PIC18F parts cannot run.
Recommended
Industrial HVAC Fan Control
HVAC variable-speed fan controllers benefit from the PIC18LF4439-I/P's integrated PWM and encoder peripherals plus industrial -40C to +85C temperature rating. The 32 I/O pins interface with status LEDs, keypad inputs, and UART/I2C sensors (temperature, humidity, pressure). Wide 2.0V-3.6V operation supports 3.3V system rails, simplifying power tree design in 24V industrial systems with intermediate 3.3V conversion.
Recommended
Battery-Powered Sensor Hub
Low-power portable sensor hubs benefit from the PIC18LF4439-I/P's 2.0V-3.6V operating range and integrated peripherals (ADC, USART, MSSP). Sleep currents can be reduced to the low-microamp range using the LP and Sleep modes described in Microchip datasheet DS39630F. The 12 KB FLASH fits small protocol stacks (Modbus RTU, simple sensor fusion), and the 640-byte RAM accommodates data buffering. Industrial temperature grade supports outdoor deployments.
Recommended
Home Automation Controllers
Smart-home control panels benefit from the PIC18LF4439-I/P's I2C, SPI, and UART peripherals for connecting to displays, sensors, and wireless modules. The 40-PDIP package simplifies hand-soldered prototypes, while the 12 KB FLASH fits control logic and simple state machines. Operating from 2.0V-3.6V, it integrates easily with 3.3V-only peripherals and wireless modules without level translation.
Recommended
Pump and Valve Actuators
Small pumps and proportional valves benefit from the PIC18LF4439-I/P's motor-control PWM and 32 I/O pins for actuator drivers, position feedback encoders, and limit switches. The integrated 10-bit ADC supports current sensing and closed-loop proportional control. Industrial temperature grade (-40C to +85C) and through-hole PDIP package suit retrofit installations in industrial control cabinets.
Recommended
Educational and Hobby Electronics
The PIC18LF4439-I/P's 40-PDIP through-hole package and rich peripheral set make it ideal for educational labs and hobby projects. It is fully supported by Microchip's MPLAB X IDE, XC8 compiler, and a free simulator, with extensive application notes, code examples, and reference designs online. Breadboard-friendly form factor allows quick prototyping without SMD reflow equipment.
Recommended
Automotive Aftermarket Accessories
Aftermarket automotive accessories (auxiliary fans, lighting controllers, signal decoders) benefit from the PIC18LF4439-I/P's industrial temperature rating, motor-control PWM, and 32 I/O pins. Although NOT AEC-Q100 qualified, the part is widely used in non-safety automotive aftermarket products where automotive-grade is not required. Operating from 2.0V-3.6V with a separate regulator suits 12V automotive battery systems.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF4439-I/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF4439-I/ML | PIC18F4439-I/P | PIC18LF4331-I/P | PIC18LF4439-E/P |
|---|---|---|---|---|---|
| Package | 40-PDIP | 44-QFN (ML) - SMD only | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| FLASH Size | 12 KB | 12 KB | 12 KB | 8 KB (-33%) | 12 KB |
| RAM Size | 640 B | 640 B | 640 B | 768 B | 640 B |
| Operating Voltage | 2.0V-3.6V (LF) | 2.0V-3.6V | 4.2V-5.5V (F) | 2.0V-3.6V | 2.0V-3.6V |
| Max Clock Speed | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Extended -40C to +125C |
| Motor Control PWM | Yes (14-bit) | Yes (14-bit) | Yes (14-bit) | Yes (14-bit) | Yes (14-bit) |
Key Differentiators
- Integrated motor-control PWM with 14-bit resolution and fault input (vs PIC18F4550-I/P)
- Low-voltage (LF) operation supports battery-powered designs (vs PIC18F4439-I/P)
- Dual sample-and-hold ADC for simultaneous motor current sensing (vs PIC18LF4331-I/P)
Design Notes
Estimated: VDD=3.3V, IDD active at 40 MHz is approximately 15 mA per Microchip datasheet DS39630F. Use a 100 nF decoupling capacitor close to each VDD pin (pins 11 and 32) and a 10 uF bulk capacitor on the supply rail. Adding a ferrite bead on VDD helps suppress switching noise from digital outputs entering analog sections.
Route analog signals (AN0-AN7) away from digital PWM outputs to minimize coupled noise into ADC measurements. Keep the MCLR pin trace short, and place the pull-up resistor (typically 10 kOhm) close to the pin. For ICSP programming, expose the ICSPDAT (RB7/PGD), ICSPCLK (RB6/PGC), and MCLR pins on a 6-pin header for production programming access.
Estimated: at 3.3V VDD and 15 mA active current, power dissipation is approximately 50 mW, well below thermal limits of the 40-PDIP package (theta_JA ~50 C/W). Junction temperature rise is negligible (<3C). However, if driving 32 outputs at 20 mA each, dissipation can exceed 1 W - calculate PJ = (VDD - Vload_avg) x Iout x N before claiming thermal headroom.
Do not connect AVDD to VDD through a ferrite without bypassing - AVDRD noise degrades ADC accuracy. Never leave the MCLR pin floating - use a 10 kOhm pull-up to VDD. When using the LF (low-voltage) variant, ensure all I/O signals from external devices operate within 0 to VDD range, or add clamping to avoid exceeding VDD+0.3V absolute maximum.
Compliance Information
RoHS compliant per Microchip product page; not AEC-Q100 qualified (industrial grade only). The /P suffix in PIC18LF4439-I/P indicates lead-free PDIP package per Microchip ordering conventions.
