PIC18LF4439T-I/PT - 8-bit MCU, 12KB Flash, 44-TQFP | Microchip
MPN: PIC18LF4439T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.05 | $7.05 |
| 10 | $6.4 | $64.00 |
| 100 | $5.75 | $575.00 |
| 500 | $5.2 | $2,600.00 |
| 1,000 | $4.8 | $4,800.00 |
PIC18LF4439T-I/PT Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, Flash program memory, peripherals, and I/O onto one die. The PIC18F architecture (Harvard, RISC) executes one instruction per clock cycle (except branches) and is widely used for embedded control in industrial, consumer, and automotive applications. Within Microchip's hierarchy, the PIC18F family sits between baseline PIC10/12/16 parts and the 16-bit dsPIC/PIC24 families.
Key features of the PIC18LF4439T-I/PT include enhanced Flash memory supporting self-programmability, an industrial operating temperature range of -40C to +85C, and a 44-pin TQFP surface-mount footprint. The part suffix -LF denotes the low-voltage (LF) process variant optimized for operation at reduced VDD, while the T indicates Tape and Reel packaging and I denotes the industrial temperature grade.
Typical applications include motor control (the PIC18F4439 family integrates dedicated motor-control peripherals such as PWM and quadrature encoder interfaces), sensor interfacing, low-power industrial controllers, and consumer appliance control. The combination of 12KB Flash, 640 bytes RAM, and 32 I/O is well-suited to small control loops where deterministic timing and modest code size matter more than raw CPU throughput.
When designing with this part, verify the supply voltage range against your application: the LF process variant typically operates down to ~2.0 V, while the standard F variant operates 4.2-5.5 V. Engineers should consult the PIC18F4331/4431 datasheet family, which shares the same peripheral set, for detailed electrical characteristics and timer configuration.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, helping engineers and procurement teams select and source the PIC18LF4439T-I/PT with full context.
Drop-in alternatives for PIC18LF4439T-I/PT — 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 PIC18LF4439T-I/PT (same form factor and footprint) — differing in Package, I/O Pins, ADC, Communication Interfaces, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF4439-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF4431T-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF4331T-I/PT
✅ Drop-In✓ In Stock
$4.2 / Unit
View Datasheet →PIC18LF4320T-I/PT
✅ Drop-In✓ In Stock
$4.15 / Unit
View Datasheet →PIC18LF4321-I/ML
✅ Drop-In✓ In Stock
$4.43 / Unit
View Datasheet →PIC18LF4439T-I/PT Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit Microcontroller (MCU) |
| Family | PIC18F |
| Program Memory (Flash) | 12 KB |
| RAM | 640 bytes |
| Number of I/O Pins | 32 |
| Package | 44-TQFP (PT) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40C to +85C (Industrial) |
| Temperature Grade | I (Industrial) |
| Supply Voltage (LF) | 2.0 V to 5.5 V (LF variant) |
| Packaging | Tape and Reel (T) |
| Instruction Set Architecture | PIC18F enhanced Harvard RISC |
| Process Variant | LF (Low-Voltage) |
| Pin Count | 44 |
| RoHS Status | Compliant |
PIC18LF4439T-I/PT Pin Configuration
| Pin 1 | RC0/T1OSI — I/O port C bit 0 / Timer1 oscillator input |
| Pin 2 | RC1/T1OSO — I/O port C bit 1 / Timer1 oscillator output |
| Pin 3 | RC2/CCP1 — I/O port C bit 2 / Capture-Compare-PWM 1 |
| Pin 4 | RC3/CCP2 — I/O port C bit 3 / Capture-Compare-PWM 2 |
| Pin 5 | RC4 — I/O port C bit 4 |
| Pin 6 | RC5 — I/O port C bit 5 |
| Pin 7 | RC6/TX — I/O port C bit 6 / EUSART TX |
| Pin 8 | RC7/RX — I/O port C bit 7 / EUSART RX |
| Pin 9 | OSC2/RA6 — Oscillator output / I/O port A bit 6 |
| Pin 10 | OSC1/RA7 — Oscillator input / I/O port A bit 7 |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | VSS — Ground reference |
| Pin 13 | RA0/AN0 — I/O port A bit 0 / Analog input 0 |
| Pin 14 | RA1/AN1 — I/O port A bit 1 / Analog input 1 |
| Pin 15 | RA2/AN2 — I/O port A bit 2 / Analog input 2 |
| Pin 16 | RA3/AN3/VREF+ — I/O port A bit 3 / Analog input 3 / VREF+ |
| Pin 17 | RA4/AN4 — I/O port A bit 4 / Analog input 4 |
| Pin 18 | RA5/AN5/SS — I/O port A bit 5 / Analog input 5 / SPI slave select |
| Pin 19 | RB0/INT0 — I/O port B bit 0 / External interrupt 0 |
| Pin 20 | RB1/INT1 — I/O port B bit 1 / External interrupt 1 |
| Pin 21 | RB2/INT2 — I/O port B bit 2 / External interrupt 2 |
| Pin 22 | RB3/CCP3 — I/O port B bit 3 / Capture-Compare-PWM 3 |
| Pin 23 | RB4 — I/O port B bit 4 |
| Pin 24 | RB5 — I/O port B bit 5 |
| Pin 25 | RB6/PGC — I/O port B bit 6 / ICSP clock |
| Pin 26 | RB7/PGD — I/O port B bit 7 / ICSP data |
| Pin 27 | RD0 — I/O port D bit 0 |
| Pin 28 | RD1 — I/O port D bit 1 |
| Pin 29 | RD2 — I/O port D bit 2 |
| Pin 30 | RD3 — I/O port D bit 3 |
| Pin 31 | RD4 — I/O port D bit 4 |
| Pin 32 | RD5 — I/O port D bit 5 |
| Pin 33 | RD6 — I/O port D bit 6 |
| Pin 34 | RD7 — I/O port D bit 7 |
| Pin 35 | RE0 — I/O port E bit 0 |
| Pin 36 | RE1 — I/O port E bit 1 |
| Pin 37 | RE2 — I/O port E bit 2 |
| Pin 38 | RE3 — I/O port E bit 3 |
| Pin 39 | MCLR/VPP — Master clear / ICSP programming voltage |
| Pin 40 | VSS — Ground reference |
| Pin 41 | VDD — Positive supply voltage |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC18LF4439T-I/PT is suitable for 6 applications: BLDC / PMSM Motor Control, Sensor Signal Conditioning & Industrial Sensing, Appliance Control - Washing Machine / Dishwasher Motor Board, Hobby Robotics & Low-Voltage DC Motor Drivers, Building Automation & HVAC Actuators, Education & Development Platforms.
BLDC / PMSM Motor Control
The PIC18LF4439T-I/PT is well suited to brushless DC (BLDC) and permanent-magnet synchronous motor (PMSM) control in low-voltage battery systems. Its integrated motor-control peripherals - dedicated PWM with complementary outputs and programmable dead-band, quadrature encoder interface (QEI), and high-speed ADC - allow precise commutation without external logic. At VDD 3.3 V, the LF core regulates Flash read operation down to 2.0 V, enabling 2-cell Li-ion or 6 V lead-acid motor packs. The 12KB Flash is well inside the firmware budget for field-oriented control (FOC) state machines, while 32 I/O supports Hall-sensor input, fault flags, brake/coast control, and CAN or UART diagnostics.
Recommended
Sensor Signal Conditioning & Industrial Sensing
The PIC18LF4439T-I/PT can serve as the conditioning front end for industrial sensor nodes that combine analog and digital I/O. The 32 I/O count covers multiple 4-20 mA loop interfaces, RTD/thermocouple excitation switches, and digital status LEDs. Combined with the PIC18F 10-bit ADC (up to ~500 ksps), the device can sample and linearize sensor data, run calibration math in firmware, and publish the result over UART or SPI to a higher-level controller. The -40C to +85C industrial grade supports factory floor and outdoor cabinet deployments where commercial-grade parts would fail. Low-power Sleep and Idle modes further extend battery life in remote telemetry units.
Recommended
Appliance Control - Washing Machine / Dishwasher Motor Board
For white-goods motor boards like washing-machine drum drivers and dishwasher pump controllers, the PIC18LF4439T-I/PT provides the right blend of deterministic real-time performance, motor-control peripherals, and 12KB Flash for state-machine logic plus protection firmware. The 44-TQFP footprint integrates cleanly into densely populated motor-control PCBs alongside the gate driver, current-sense amplifier, and AC-line isolated power supply. Its industrial temperature grade is well matched to the thermal environment of an appliance cabinet, and the LF process variant tolerates the supply sag during inrush events on the 12 V motor rail. PWM-based soft-start and overcurrent trip shutdowns are easily implemented in firmware.
Recommended
Hobby Robotics & Low-Voltage DC Motor Drivers
Hobby robotics platforms benefit from the PIC18LF4439T-I/PT's integrated motor-control hardware. Its dedicated PWM, QEI, and ADC channels let a single chip close the loop on one or two DC or stepper motors, leaving the higher-level motion planner running on a separate CPU. The LF core simplifies power design for battery-powered platforms (Li-ion 1S or 2S) that cannot tolerate 5 V-only MCUs. 12KB Flash holds a small real-time kernel plus encoder-filter state, while 32 I/O is sufficient to read quadrature encoders on two axes, drive H-bridges, and expose a UART link to a Raspberry Pi or other host controller.
Recommended
Building Automation & HVAC Actuators
Building-automation damper and valve actuators that move air or water in response to a BACnet/Modbus command can use the PIC18LF4439T-I/PT as the loop controller. The industrial temperature grade covers unconditioned mechanical rooms and rooftop installations, while the LF supply range simplifies 24 VAC-derived DC-rail design. 12KB Flash is plenty for proportional-integral control loops, calibration tables, and communication stacks. The 32 I/O accommodate end-switch inputs, position feedback (potentiometer or encoder), TRIAC drive outputs, and a UART/RS-485 link to the building management system.
Recommended
Education & Development Platforms
The PIC18LF4439T-I/PT is a credible teaching platform for courses covering 8-bit embedded control, assembly language, and motor-control fundamentals. Its 44-TQFP package is breadboardable with an adaptor PCB or SOIC-to-DIP breakout, and Microchip's MPLAB X IDE + XC8 compiler provides a free toolchain. The motor-control peripherals give students a path from GPIO toggling to PWM-driven BLDC speed control without external hardware. 12KB Flash exercises code-size discipline typical of industrial 8-bit firmware, and the LF process variant lets students power the board from a single Li-ion cell during lab exercises.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF4439T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF4439-I/PT | PIC18LF4431T-I/PT | PIC18LF4331T-I/PT | PIC18LF4320T-I/PT | PIC18LF4321-I/ML |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (PT) | 44-TQFP (PT) - same | 44-TQFP (PT) - same | 44-TQFP (PT) - same | 44-TQFP (PT) - same | 44-TQFP family - same |
| Program Memory (Flash) | 12 KB | 12 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| RAM | 640 bytes | 640 bytes | 640 bytes | 640 bytes | 512 bytes | 512 bytes |
| Number of I/O | 32 | 32 | 32 | 32 | 32 | 32 |
| Operating Temperature Range | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) |
| Process Variant | LF (Low-Voltage) | LF (Low-Voltage) | LF (Low-Voltage) | LF (Low-Voltage) | LF (Low-Voltage) | LF (Low-Voltage) |
| Approx. Unit Price (qty 1, USD) | 7.05 | 6.50 | 5.80 | 5.65 | 5.20 | 5.10 |
Key Differentiators
- Lowest voltage operation in the PIC18F4439 family (vs PIC18F4439-I/PT)
- Largest program memory in the 44-TQFP PIC18LF motor-control family (vs PIC18LF4431T-I/PT)
- Tape-and-Reel packaging for high-volume SMT assembly (vs PIC18LF4439-I/PT)
- Industrial temperature grade (vs PIC18LF4439-E/PT)
Design Notes
The PIC18LF4439T-I/PT requires a 100 nF decoupling cap on each VDD/VSS pair placed within 5 mm of the pins, plus a bulk 10 uF tantalum or ceramic on the main supply rail. The LF process variant operates down to 2.0 V; if your system is exposed to large inrush transients (e.g. shared motor rail), size the decoupling to keep VDD above 2.0 V at the device pin during the worst-case transient. Estimated: at a 50 mA load step on a 22 AWG power lead, a 10 uF bulk cap holds VDD above 2.0 V for ~200 us.
Place the 20 MHz (or 40 MHz PLL output) crystal close to OSC1/OSC2 (pins 9-10) with traces shorter than 5 mm and a grounded guard ring. Route analog inputs (AN0-AN5 on port A) away from the PWM channel via PWM lead/lag on port C; otherwise the high dV/dt switching edges couple into ADC samples. Keep the MCLR pull-up (typically 10 kohm) within 5 mm of pin 39 to avoid spurious resets from injection.
Do not drive the ICSP PGC/PGD lines with external loads during programming - the ICD programmer drives these pins and external contention prevents Flash writes. Always disable the watchdog timer in CONFIG before enabling it via firmware, otherwise the device can reset in the middle of Flash self-programming and brick the part. Also note that the LF process variant requires the BOR (Brown-Out Reset) enabled for reliable Flash read below ~3.0 V.
Estimated: in the 44-TQFP package with theta_JA around 50 C/W on a 4-layer 1 oz copper PCB, the PIC18LF4439T-I/PT can dissipate ~1 W in still air before exceeding the +85C industrial limit. For motor-control applications where the MCU is colocated with switching power devices, place the TQFP away from MOSFETs and rectifiers, and provide copper pours on both top and bottom layers tied to the ground plane for thermal spreading.
Compliance Information
RoHS and REACH compliant per Microchip product page. Industrial temperature grade (I), not automotive AEC-Q100 qualified - see PIC18F4439T-I/PT-E for extended qualification options. Lead-free and halogen-free packaging.