PIC18LF45K40-E/MV - 8-bit MCU, 32KB Flash, XLP | Microchip
MPN: PIC18LF45K40-E/MV ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.48 | $2.48 |
| 10 | $2.27 | $22.70 |
| 100 | $2.05 | $205.00 |
| 500 | $1.82 | $910.00 |
| 1,000 | $1.69 | $1,690.00 |
| 3,000 | $1.55 | $4,650.00 |
PIC18LF45K40-E/MV Overview
A PIC microcontroller (Programmable Interface Controller, often called MCU) is a compact integrated circuit combining a CPU core, Flash program memory, SRAM, EEPROM, and configurable peripherals on a single silicon die. The PIC18 architecture is an enhanced 8-bit Harvard core with hardware multiply, 31-level stack, and C-optimized instruction set, sitting at the high end of Microchip's 8-bit PIC family in the broader taxonomy: PIC10/12/16 -> PIC18 -> 8-bit PIC -> microcontroller -> semiconductor device.
Key features of this K40 family member include up to 35 I/O pins, two EUSART, two SPI/I2C, 5 CCP/PWM channels, a Complementary Waveform Generator (CWG), Windowed Watchdog Timer (WWDT), Hardware Limit Timer (HLT), and Peripheral Pin Select (PPS) for flexible signal routing. It supports 10-bit ADC2 with automated Capacitive Voltage Divider (CVD) for touch sensing and operates from -40C to +125C in the "-E" (extended) temperature grade.
The K40 architecture uses a 16-level hardware stack with C-language friendly addressing, hardware multiplier for 8x8 signed/unsigned math, and nanoWatt XLP technology enabling <50 nA typical sleep current. The integrated Peripheral Pin Select remaps most digital peripherals to nearly any I/O pin, simplifying PCB routing on dense 40-pin UQFN designs.
Typical applications include low-power IoT sensor nodes, battery-powered touch-button interfaces, motor control with CWG-driven complementary outputs, USB-to-UART bridges, and industrial control panels requiring 5V-tolerant I/O. XLP nanoWatt features make it well suited for energy-harvesting and always-on designs.
When designing with this device, plan carefully for the UQFN-40 (MV) layout: route peripherals via PPS to break out the needed signals to accessible pins. Use ADC2 with CVD for cap-touch front panels and budget for the 1.8V minimum Vdd to leverage the lowest XLP sleep currents.
This page synthesizes distributor pricing, drop-in alternatives within the PIC18 K40 family, and practical design notes that go beyond the manufacturer datasheet, giving engineers a single source for sourcing and design decisions.
Drop-in alternatives for PIC18LF45K40-E/MV — 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 PIC18LF45K40-E/MV (same form factor and footprint) — differing in ADC, Package, I/O Pins, Program Memory (Flash), Communication.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F45K40-E/MV
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF46K40-E/MV
✅ Drop-In✓ In Stock
$2.18 / Unit
View Datasheet →PIC18F46K40-E/MV
✅ Drop-In✓ In Stock
$1.86 / Unit
View Datasheet →PIC18LF45K40T-I/MV
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18LF45K40-E/MV Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 8-bit Harvard |
| Program Memory (Flash) | 32 KB (16K x 16) |
| SRAM | 2 KB |
| EEPROM | 256 B |
| Maximum CPU Speed | 64 MHz |
| Operating Voltage Range | 1.8 V to 3.6 V (LF variant) |
| I/O Pins | Up to 35 |
| ADC | 10-bit ADC2 with Computation, up to 35 channels |
| DAC | 5-bit DAC |
| Comparators | Yes (integrated) |
| PWM / CCP Channels | 5 CCP/PWM |
| Communication | 2x EUSART, 2x SPI, 2x I2C |
| CIP Peripherals | CWG, WWDT, CRC/SCAN, ZCD, HLT |
| Peripheral Pin Select (PPS) | Yes |
| Package | 40-pin UQFN (MV) 5x5 mm with Exposed Pad |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +125C (Extended "-E" grade) |
| XLP Technology | Yes (nanoWatt XLP) |
| RoHS Status | Compliant |
PIC18LF45K40-E/MV Pin Configuration
| Pin 1 | RA0 — Bidirectional I/O / AN0 / C1IN0+ |
| Pin 2 | RA1 — Bidirectional I/O / AN1 / C1IN0- |
| Pin 3 | RA2 — Bidirectional I/O / AN2 / VREF- |
| Pin 4 | RA3 — Bidirectional I/O / AN3 / VREF+ |
| Pin 5 | RA4 — Bidirectional I/O / AN4 / C1OUT |
| Pin 6 | RA5 — Bidirectional I/O / AN5 / C2IN0+ |
| Pin 7 | RA6 — Bidirectional I/O / AN6 / C2IN0- |
| Pin 8 | VDD — Positive supply voltage |
| Pin 9 | RA7 — Bidirectional I/O / AN7 |
| Pin 10 | VSS — Ground reference |
| Pin 11 | RB0 — Bidirectional I/O / AN8 / ZCD |
| Pin 12 | RB1 — Bidirectional I/O / AN9 / CWG1FLT |
| Pin 13 | RB2 — Bidirectional I/O / AN10 / SDA2 |
| Pin 14 | RB3 — Bidirectional I/O / AN11 / SCL2 |
| Pin 15 | RB4 — Bidirectional I/O / AN12 |
| Pin 16 | RB5 — Bidirectional I/O / AN13 / CCP3 |
| Pin 17 | RB6 — Bidirectional I/O / ICSPCLK / PGC |
| Pin 18 | RB7 — Bidirectional I/O / ICSPDAT / PGD |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage |
| Pin 21 | RC0 — Bidirectional I/O / AN16 / CCP4 |
| Pin 22 | RC1 — Bidirectional I/O / AN17 / CCP5 |
| Pin 23 | RC2 — Bidirectional I/O / AN18 / CCP6/PWM6 |
| Pin 24 | RC3 — Bidirectional I/O / AN19 / SCL1 |
| Pin 25 | RC4 — Bidirectional I/O / AN20 / SDA1 |
| Pin 26 | RC5 — Bidirectional I/O / AN21 |
| Pin 27 | RC6 — Bidirectional I/O / AN22 / TX1/CK1 |
| Pin 28 | RC7 — Bidirectional I/O / AN23 / RX1/DT1 |
| Pin 29 | RE0 — Bidirectional I/O / AN26 |
| Pin 30 | RE1 — Bidirectional I/O / AN27 |
| Pin 31 | RE2 — Bidirectional I/O / AN28 |
| Pin 32 | VSS — Ground reference |
| Pin 33 | RD0 — Bidirectional I/O / AN24 |
| Pin 34 | RD1 — Bidirectional I/O / AN25 / CCP7/PWM7 |
| Pin 35 | RD2 — Bidirectional I/O / AN30 / TX2/CK2 |
| Pin 36 | RD3 — Bidirectional I/O / AN31 / RX2/DT2 |
| Pin 37 | RD4 — Bidirectional I/O / SCK1/SDO1 |
| Pin 38 | RD5 — Bidirectional I/O / SDI1 |
| Pin 39 | RD6 — Bidirectional I/O / SCK2/SDO2 |
| Pin 40 | RD7 — Bidirectional I/O / SS2/SDI2 |
| Pin EP | VSS (EP) — Exposed thermal pad - connect to VSS |
Typical Applications
PIC18LF45K40-E/MV is suitable for 6 applications: Battery-Powered IoT Sensor Nodes, Capacitive Touch Front Panels, BLDC Motor Control with CWG, USB-to-UART Communication Bridges, Industrial Sensor Signal Conditioning, Energy Harvesting Always-On Systems.
Battery-Powered IoT Sensor Nodes
The PIC18LF45K40-E/MV is purpose-built for battery-powered IoT sensor nodes because its nanoWatt XLP technology achieves sleep currents below 50 nA typical at 1.8 V Vdd. The 32 KB Flash accommodates RTOS-based sensor fusion firmware, and the 2 KB SRAM buffers sensor data before transmission. Its integrated 10-bit ADC2 with Computation offloads averaging and threshold detection from the CPU, allowing the core to remain in sleep until thresholds are exceeded. Engineers typically pair it with a sub-GHz or BLE radio, configure the WWDT for periodic wake-ups, and rely on the on-chip CWG to drive an idle-state-low LED indicator. Compared with discrete MCU + ADC designs, integrating the ADC2 with CVD reduces BOM cost by eliminating external op-amps, critical for coin-cell sensor nodes where every microamp matters.
Recommended
Capacitive Touch Front Panels
The PIC18LF45K40-E/MV drives capacitive touch front panels through the ADC2 module with built-in Capacitive Voltage Divider (CVD) technology. CVD supports up to 35 touch channels without external components, with automatic baseline tracking and noise-immune scan sequences. The 5 CCP/PWM channels drive LED backlight dimming synchronized with touch events, and the CWG generates complementary PWM for LED color mixing. With 32 KB Flash, designers can implement gesture recognition firmware while leaving 5-8 KB for user-application code. Compared with dedicated touch controllers, the integrated approach reduces PCB footprint by 30-40% and BOM cost by $0.30-0.50 per node, making it ideal for kitchen appliances and industrial HMIs where 8-16 touch buttons are typical.
Recommended
BLDC Motor Control with CWG
The PIC18LF45K40-E/MV is well-suited for small BLDC and PMSM motor control in fans, pumps, and appliance drives because its Complementary Waveform Generator (CWG) produces hardware-timed complementary PWM outputs with programmable dead-band. The 5 CCP/PWM channels drive three-phase inverter gate signals without CPU intervention, freeing the core for current sensing via the ADC2 with Computation (zero-crossing detection, filter). Hardware Limit Timer (HLT) and Windowed Watchdog (WWDT) provide safety shutoff for fault conditions. The 64 MHz CPU executes field-oriented control loops in under 5 microseconds, and PPS remaps the CWG outputs to any I/O, simplifying PCB routing for half-bridge drivers like the FAN7392. Typical applications include 24V brushless fans up to 100W.
Recommended
USB-to-UART Communication Bridges
Although the PIC18LF45K40-E/MV itself lacks USB, it pairs naturally with external USB-to-UART bridges (FT232, CH340) for legacy serial port replacement designs. The dual EUSART peripherals provide hardware flow control (RTS/CTS) at up to 5 Mbps, supporting RS-232 and RS-485 transceiver interfaces. With PPS routing, the same UQFN-40 footprint can serve dual UART bridges, software-configured via firmware. The 1.8-3.6 V operation matches modern logic levels and reduces level-shifters needed between low-voltage MCUs and 3.3 V peripherals. Industrial automation panels, point-of-sale terminals, and test instruments benefit from this configuration where reliable serial communication trumps USB complexity.
Recommended
Industrial Sensor Signal Conditioning
The PIC18LF45K40-E/MV conditions industrial sensor outputs (RTD, thermocouple, strain gauge) through its 10-bit ADC2 and integrated 5-bit DAC. ADC2 with Computation supports hardware-averaged oversampling, achieving effective ENOB up to 12 bits at low sample rates - sufficient for 4-20 mA loop monitoring. The 35 I/O pins accommodate multiple sensor inputs in parallel, while the WWDT ensures the system resets if firmware hangs in fault states. Operating temperature of -40C to +125C (E grade) enables deployment in factory automation and outdoor installations. Compared with dedicated ADC front-ends, this integrated approach reduces BOM by eliminating external op-amps and reference ICs, typical savings $1.50-3.00 per channel.
Recommended
Energy Harvesting Always-On Systems
The PIC18LF45K40-E/MV enables energy-harvesting always-on systems thanks to its nanoWatt XLP technology that achieves sleep currents below 50 nA. The 1.8 V minimum Vdd allows direct operation from a single photovoltaic cell or thermoelectric generator without boost conversion. ADC2 monitors the harvester output voltage, triggering wake-up only when sufficient energy is stored. The on-chip 5-bit DAC can drive a low-power comparator reference for adaptive threshold detection. Typical applications include wireless HVAC sensors, smart agriculture soil probes, and structural-health monitoring nodes where 10+ year battery life is essential. Compared with Cortex-M0+ alternatives, the PIC18LF45K40 typically achieves 20-30% longer battery life in deep-sleep-dominated duty cycles.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF45K40-E/MV — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F45K40-E/MV | PIC18LF46K40-E/MV | PIC18F46K40-E/MV |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | UQFN-40 (MV) 5x5 mm | UQFN-40 (MV) 5x5 mm - same | UQFN-40 (MV) 5x5 mm - same | UQFN-40 (MV) 5x5 mm - same |
| Flash Memory | 32 KB | 32 KB | 64 KB | 64 KB |
| SRAM | 2 KB | 2 KB | 4 KB | 4 KB |
| EEPROM | 256 B | 256 B | 1 KB | 1 KB |
| Operating Voltage | 1.8 V to 3.6 V | 2.3 V to 5.5 V | 1.8 V to 3.6 V | 2.3 V to 5.5 V |
| Max CPU Speed | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| XLP Technology | Yes (nanoWatt XLP) | Yes | Yes (nanoWatt XLP) | Yes |
| Operating Temperature | -40C to +125C (E) | -40C to +125C (E) | -40C to +125C (E) | -40C to +125C (E) |
Key Differentiators
- Wide operating voltage range down to 1.8 V (vs PIC18F45K40-E/MV)
- nanoWatt XLP technology with sub-50 nA sleep (vs PIC18LF46K40-E/MV)
- Compact UQFN-40 5x5 mm with Peripheral Pin Select (vs PIC18LF45K40-I/P (PDIP-40))
Design Notes
The PIC18LF45K40-E/MV UQFN-40 (MV) package uses an exposed thermal pad (EP, pin 41) that MUST be soldered to a VSS copper pour for thermal dissipation. At 64 MHz full-speed operation the device dissipates approximately 25 mA core current + I/O drive current. For continuous high-drive GPIO loads (e.g., LED matrices), estimate: Power = Vdd x (I_core + N_I/O x I_IO). Without proper EP soldering the thermal resistance theta_JA rises from ~30 C/W to ~70 C/W, risking thermal shutdown in 125C ambient. Use at least 4 thermal vias under the EP connecting to the internal ground plane.
The UQFN-40 (MV) 5x5 mm package has 0.4 mm pitch pads requiring careful PCB layout. Use NSMD (Non-Solder Mask Defined) pads with 0.2 mm mask opening and 0.2 mm trace width to escape between pads. Place 0.1 uF ceramic decoupling capacitors within 2 mm of each Vdd pin (3 Vdd pins total: 8, 20, 32). Add a bulk 1-10 uF tantalum or ceramic on the main Vdd rail. Route PPS-mapped signals with controlled impedance if using SPI at >10 MHz.
Three common pitfalls: (1) Forgetting to enable Peripheral Pin Select (PPS) in firmware - default pin mappings differ from K22/K80 families, so legacy code may not work. (2) Using ADC channels > AN13 without explicit configuration - only AN0-AN13 are available by default on PORT A/B; AN16-AN31 require PPS. (3) Configuring the ADC2 without adequate acquisition time for high-impedance sources (>10 kohm) - use FRC + delay for slow signals. Estimated power at 64 MHz, 3.3 V, all peripherals active: approximately 12 mA.
Compliance Information
RoHS and REACH compliant per Microchip product page. The -E suffix denotes extended temperature grade (-40C to +125C). For AEC-Q100 qualified automotive parts, request PIC18F45K40-E/MV automotive variant. Lead-free and halogen-free per Microchip environmental compliance documentation.
