PIC18LF45K40T-I/ML - 32KB Flash 8-Bit XLP MCU 64MHz QFN-44
MPN: PIC18LF45K40T-I/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.72 | $17.20 |
| 100 | $1.55 | $155.00 |
| 500 | $1.34 | $670.00 |
| 1,000 | $1.18 | $1,180.00 |
| 3,300 | $1.05 | $3,465.00 |
PIC18LF45K40T-I/ML Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), working memory (RAM), data EEPROM and a rich set of on-chip peripherals into one package. PIC18 MCUs sit in the mid-range 8-bit tier of Microchip's product line, above base-line PIC10/12/16 parts in code density and peripheral integration, and below the PIC24/dsPIC and 32-bit families in raw compute throughput. The "LF" prefix indicates a wide-voltage device that can run across 1.8 V to 3.6 V (F-version parts extend this to 5.5 V), enabling direct battery-powered designs.
Key features include Microchip's eXtreme Low Power (XLP) technology with claimed nanoWatt sleep currents, 10-bit ADC with Computation (ADC2), 5-bit DAC, two comparators, multiple Capture/Compare/PWM modules, Complementary Waveform Generator (CWG), Windowed Watchdog Timer (WWDT), CRC/SCAN hardware and Zero-Cross Detect. Core-Independent Peripherals handle events without CPU wake-up, which is critical for XLP designs. The 44-pin QFN footprint exposes up to 36 I/O pins supporting multiple communication peripherals including UART, SPI and I2C.
Typical applications include low-power IoT sensor nodes, battery-powered instrumentation, white goods and small appliance controls, USB-less human-interface panels and industrial sensor-conditioning nodes. The exposed-pad QFN package also makes it suitable for space-constrained layouts where thermal conduction into the PCB ground plane is needed for the higher F-version dissipation.
When designing with this part, ensure the exposed pad is soldered to a sufficient copper area for thermal relief. The QFN-44 (8x8 mm) footprint differs from the 40-pin PDIP and 44-pin TQFP variants of the same die - plan your PCB land pattern accordingly and verify the pinout against the family datasheet.
This page synthesizes distributor pricing, tape-and-reel availability, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC18LF45K40T-I/ML — 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 PIC18LF45K40T-I/ML (same form factor and footprint) — differing in ADC, Operating Temperature, Package, I/O Pins, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF45K40-I/ML
✅ Drop-In✓ In Stock
$1.92 / Unit
View Datasheet →PIC18LF46K40T-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF45K22T-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF45K40T-I/ML Maximum Ratings & Electrical Characteristics
| Core | PIC18 8-bit enhanced MCU |
| Program Memory (Flash) | 32 KB (16K x 16) |
| Data RAM | 2 KB |
| Data EEPROM | 256 B |
| Maximum CPU Frequency | 64 MHz |
| Operating Voltage Range | 1.8 V to 3.6 V (LF family) |
| ADC | 10-bit with Computation (ADC2) |
| DAC | 5-bit |
| Comparators | 2 |
| Package | 44-pin QFN (8x8 mm) with exposed pad |
| Operating Temperature | -40C to +85C (I grade) |
| I/O Pins | Up to 36 |
| XLP Technology | Yes (nanoWatt sleep) |
| Packaging | Tape & Reel ("T" suffix) |
| RoHS Status | Compliant |
PIC18LF45K40T-I/ML 44-pin qfn (8x8 mm) with exposed pad Pin Configuration Guide
Pin configuration for PIC18LF45K40T-I/ML (44-pin qfn (8x8 mm) with exposed pad package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for PIC18LF45K40T-I/ML.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC18LF45K40T-I/ML is suitable for 6 applications: Battery-Powered IoT Sensor Node, White Goods / Small Appliance Control, Industrial Sensor Conditioning Module, HMI / User Interface Panel, Automotive Body / Interior Node (non-Automotive Grade), Portable Test & Measurement Instrument.
Battery-Powered IoT Sensor Node
The PIC18LF45K40T-I/ML suits battery-powered IoT sensor nodes because its 1.8 V-3.6 V wide-voltage range lets it run directly from a 2x AA or Li-ion cell without a boost converter. Its XLP nanoWatt sleep current (under 50 nA typical) plus Retention-only RAM mode lets a 2,400 mAh Li-ion cell survive multi-year deployments. The 10-bit ADC2 with Computation handles oversampling locally, the 5-bit DAC can drive a reference, and CWG plus PWM peripherals drive sensor excitation without waking the core. The 44-pin QFN (8x8 mm) footprint keeps the PCB small, while the exposed pad enables thermal relief for higher F-version variants in hotter enclosures.
Recommended
White Goods / Small Appliance Control
The PIC18LF45K40T-I/ML fits small-appliance control boards where its PIC18 K40 peripheral mix replaces several discrete timers. The 36 available I/O pins drive multiplexed key matrices, LED arrays, seven-segment displays and triac-fired heater or motor loads. The Complementary Waveform Generator (CWG) handles dead-band control for half-bridge drivers, while multiple PWM channels drive BLDC or universal motors. The -40C to +85C industrial temperature rating covers kitchen and laundry environments, and the 32 KB Flash is sufficient for fuzzy-logic or PID firmware with on-board diagnostics. The QFN-44 footprint shrinks the PCB versus legacy 44-pin TQFP designs.
Recommended
Industrial Sensor Conditioning Module
The PIC18LF45K40T-I/ML is well-matched to 4-20 mA loop-powered or 24 V industrial sensor-conditioning modules. Its 10-bit ADC2 with Computation oversamples low-frequency transducer signals (RTD, thermistor, strain gauge) and computes averages/hysteresis in hardware, offloading the CPU. The on-chip 5-bit DAC and two comparators implement window comparators for alarm outputs without external op-amps. CRC/SCAN and WWDT hardware satisfy IEC 61508 SIL-1 type functional-safety expectations at minimal firmware cost. Industrial-grade -40C to +85C operation and the wide-voltage LF supply range handle transients on 24 V rails without auxiliary regulation.
Recommended
HMI / User Interface Panel
The PIC18LF45K40T-I/ML drives low-cost HMI panels with capacitive touch buttons, segmented LCDs (via the on-chip LCD controller not available on this K40 derivative but reachable via the family), LED status rings, and UART/SPI/I2C bridges to a host controller. The 36 I/O pins support up to 12 capacitive-touch channels through the on-chip CVD module, eliminating an external touch IC. Core-Independent Peripherals debounce inputs and run displays while the CPU sleeps, which keeps the XLP current budget intact. The QFN-44 (8x8 mm) package enables compact front-panel PCBs behind a bezel.
Recommended
Automotive Body / Interior Node (non-Automotive Grade)
For non-safety automotive interior applications such as ambient lighting, seat-position memory or HVAC blend-door actuators, the PIC18LF45K40T-I/ML delivers the right mix of PWM, ADC and Core-Independent Peripherals. Note this part is industrial-grade, not AEC-Q100 qualified - select a PIC18F or PIC18LF K40 part explicitly carrying the -Q1 or -VAO suffix for AEC-Q100 requirements. The LF variant's 1.8 V-3.6 V range runs directly from automotive 3.3 V rails. Designers should validate PCB-level ESD/EMI compliance against ISO 7637-2 and ISO 10605 transients externally.
Recommended
Portable Test & Measurement Instrument
The PIC18LF45K40T-I/ML powers portable handheld test instruments like multimeters, insulation testers and process calibrators where low current draw and rich analog integration matter. The 10-bit ADC2 with Computation, two comparators and 5-bit DAC implement stimulus-response measurement loops without external ASICs. The QFN-44 (8x8 mm) package fits inside a probe handle, and XLP sleep lets the instrument idle on a coin cell for months between uses. SPI/UART interfaces connect to an LCD controller or BLE module for tethered data logging.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF45K40T-I/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF45K40-I/ML | PIC18LF45K40-I/PT | PIC18LF45K40-E/PT | PIC18LF46K40T-I/ML | PIC18LF45K22T-I/ML |
|---|---|---|---|---|---|---|
| Package | 44-QFN (8x8 mm) with EP | 44-QFN (8x8) - same | 44-TQFP - different | 44-TQFP - different | 44-QFN (8x8) - same | 44-QFN (8x8) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash | 32 KB | 32 KB | 32 KB | 32 KB | 64 KB | 32 KB |
| RAM | 2 KB | 2 KB | 2 KB | 2 KB | 3 KB | 1.5 KB |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| Max CPU Frequency | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| Operating Voltage | 1.8 V to 3.6 V (LF) | 1.8 V to 3.6 V (LF) | 1.8 V to 3.6 V (LF) | 1.8 V to 3.6 V (LF) | 1.8 V to 3.6 V (LF) | 1.8 V to 3.6 V (LF) |
| Temperature Grade | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +125C (E) | -40C to +85C (I) | -40C to +85C (I) |
| ADC | 10-bit ADC2 | 10-bit ADC2 | 10-bit ADC2 | 10-bit ADC2 | 10-bit ADC2 | 10-bit ADC |
Key Differentiators
- XLP nanoWatt sleep under 50 nA typical (vs PIC18LF45K22T-I/ML)
- ADC2 with Computation oversampling (vs PIC18LF45K22T-I/ML)
- 1.8 V to 3.6 V wide-voltage LF range (vs PIC18F45K40 (F-version))
Design Notes
The 44-pin QFN (8x8 mm) package on the PIC18LF45K40T-I/ML exposes a central thermal pad that MUST be soldered to a PCB copper pour. Use an array of thermal vias (typically 9-12 vias at 0.3 mm drill) connecting the EP to the inner ground plane. Insufficient EP soldering reduces theta_JA and risks latch-up during in-circuit programming or power-on transients.
Place a 100 nF decoupling capacitor as close as possible to the Vdd pin and a bulk 10 uF tantalum or ceramic on the same node. The LF variant operates from 1.8 V to 3.6 V; ensure the regulator ripple is below 30 mVpp to avoid ADC2 noise pickup. For XLP nanoWatt sleep designs, the in-rush current on wake-up must be limited to avoid the brown-out reset tripping at low Vdd.
Do not assume the LF and F prefixes are interchangeable at the firmware level - LF requires 1.8 V-3.6 V while F supports up to 5.5 V. Programming voltage timing parameters, BOR thresholds and ADC acquisition delays differ between LF and F; always re-validate your config bits against the PIC18(L)F45K40 datasheet (DS40001579D). Also verify the "T" suffix is recognized by your pick-and-place - some feeders need an explicit reel-flag in the BOM.
When using the 10-bit ADC2 with Computation oversampling at high PWM duty cycles, route analog traces away from PWM switching lines and add a guard ring tied to analog ground around sensitive nets. The on-chip 5-bit DAC is suitable for trim and reference use but should not drive low-impedance loads directly - buffer with an MCP6002 or similar op-amp for production designs.
Compliance Information
RoHS compliant per Microchip product page and distributor listings. The PIC18LF45K40T-I/ML is NOT AEC-Q100 qualified - select a -Q1 or -VAO K40 suffix for AEC-Q100 automotive requirements.
