PIC18LF26K40-I/MV - 64KB Flash 8-Bit XLP MCU | Microchip
MPN: PIC18LF26K40-I/MV ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.65 | $26.50 |
| 100 | $2.35 | $235.00 |
| 500 | $2.1 | $1,050.00 |
| 1,000 | $1.88 | $1,880.00 |
| 2,500 | $1.72 | $4,300.00 |
PIC18LF26K40-I/MV Overview
A microcontroller is a single-chip computer that integrates a CPU, memory, and programmable I/O peripherals; the PIC18 family is Microchip's 8-bit architecture that combines RISC-like efficiency with rich on-chip peripherals for embedded control. Within that hierarchy, the LF variant denotes the low-voltage core (1.8 V to 3.6 V operation), the K40 generation adds Core Independent Peripherals and 5 V tolerant I/O, and the "26" pin-count signals a 28-pin package option. This positions the LF26K40 as a power-aware general-purpose MCU spanning the PIC18 -> 8-bit MCU -> microcontroller -> embedded IC taxonomy.
Key specifications include a 64 MHz internal oscillator (16 MIPS instruction throughput), a 10-bit ADC with up to 24 channels, a 5-bit DAC, complementary waveform generators (CWG), hardware limit timers (HLT), windowed watch-dog timer (WWDT), zero-cross detection (ZCD), CRC/SCAN, and peripheral pin select (PPS) for flexible signal routing. The device operates from 1.8 V to 3.6 V with nanoWatt XLP sleep currents that suit battery-powered designs.
The architecture couples a 16-bit wide instruction path with an 8-bit data path, delivering deterministic interrupt latency while keeping peripheral interaction intuitive. The XLP technology integrates multiple low-power modes (sleep, doze, idle, peripheral module disable) with retention RAM and a RTCC, allowing designs to draw microamps while still maintaining real-time responsiveness.
Typical applications include consumer IoT sensor nodes, battery-powered medical wearables, industrial HMI keypads, low-power wireless sensor hubs, and home appliance user-interface boards. The wide 1.8-3.6 V supply range suits single-cell Li-ion or 2x AA operation without additional boost converters.
When selecting this part, verify that your code base targets the K40 errata and PPS register set because the PPS subsystem differs from earlier PIC18F K-series devices. Designers transitioning from PIC18F25K22 or PIC18F26K22 should recompile against the XC8 K40 device pack to avoid peripheral library mismatches.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design considerations not bundled in the manufacturer datasheet, giving engineers a faster path to a validated 8-bit design.
Drop-in alternatives for PIC18LF26K40-I/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 PIC18LF26K40-I/MV (same form factor and footprint) — differing in ADC, Package, Comparators, Core, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF26K40-E/MV
✅ Drop-In✓ In Stock
$1.55 / Unit
View Datasheet →PIC18LF26K40T-I/MV
✅ Drop-In✓ In Stock
$1.92 / Unit
View Datasheet →PIC18LF26K40T-E/MV
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18LF46K40-I/MV
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F46K40-I/MV
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F26K40-I/MV
✅ Drop-In✓ In Stock
$1.18 / Unit
View Datasheet →PIC18LF26K40-I/MV Maximum Ratings & Electrical Characteristics
| Product Family | PIC18 XLP |
| Core Architecture | 8-bit PIC18 enhanced |
| Maximum CPU Frequency | 64 MHz |
| Program Memory (Flash) | 64 KB (32K x 16 words) |
| SRAM | 4 KB |
| EEPROM | 256 bytes |
| Supply Voltage Range | 1.8 V to 3.6 V |
| Operating Temperature | -40C to +85C (Industrial, "I") |
| Package | 28-UQFN (4x4 mm), "MV" designator |
| I/O Pins | Up to 25 (varies by peripheral use) |
| ADC | 10-bit, up to 24 channels |
| DAC | 5-bit, 1 channel |
| Timers | 8/16-bit with HLT, WWDT, RTCC |
| Communication Peripherals | EUSART, SPI, I2C with PPS |
| Other Peripherals | CWG, ZCD, CRC/SCAN, PWM, CCP |
| XLP Sleep Current | nanoWatt range (see datasheet for exact nA figure) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free / Halogen-Free | Yes / Yes |
| Programming/Debug | ICSP, 4-wire PDI/PGD/PGC with ICD |
PIC18LF26K40-I/MV Pin Configuration
| Pin 1 | VDD — Positive supply voltage (1.8V-3.6V) |
| Pin 2 | RA0 — PORTA0 - analog/digital I/O with PPS |
| Pin 3 | RA1 — PORTA1 - analog/digital I/O with PPS |
| Pin 4 | RA2 — PORTA2 - analog/digital I/O with PPS |
| Pin 5 | RA3 — PORTA3 - analog/digital I/O with PPS |
| Pin 6 | RA4 — PORTA4 - analog/digital I/O with PPS |
| Pin 7 | RA5 — PORTA5 - analog/digital I/O with PPS |
| Pin 8 | RA6 — PORTA6 - analog/digital I/O with PPS |
| Pin 9 | RA7 — PORTA7 - analog/digital I/O with PPS |
| Pin 10 | GND — Ground reference |
| Pin 11 | RB0 — PORTB0 - interrupt-on-change capable |
| Pin 12 | RB1 — PORTB1 - interrupt-on-change capable |
| Pin 13 | RB2 — PORTB2 - interrupt-on-change capable |
| Pin 14 | RB3 — PORTB3 - interrupt-on-change capable |
| Pin 15 | RB4 — PORTB4 - interrupt-on-change capable |
| Pin 16 | RB5 — PORTB5 - interrupt-on-change capable |
| Pin 17 | RB6 — PORTB6 - ICD PGC clock |
| Pin 18 | RB7 — PORTB7 - ICD PGD data |
| Pin 19 | RC0 — PORTC0 - analog/digital I/O |
| Pin 20 | RC1 — PORTC1 - analog/digital I/O |
| Pin 21 | RC2 — PORTC2 - analog/digital I/O |
| Pin 22 | RC3 — PORTC3 - analog/digital I/O |
| Pin 23 | RC4 — PORTC4 - analog/digital I/O |
| Pin 24 | RC5 — PORTC5 - analog/digital I/O |
| Pin 25 | RC6 — PORTC6 - analog/digital I/O |
| Pin 26 | RC7 — PORTC7 - analog/digital I/O |
| Pin 27 | VSS — Ground (digital) |
| Pin 28 | NC — No connect on UQFN 4x4 layout |
Typical Applications
PIC18LF26K40-I/MV is suitable for 6 applications: Battery-Powered IoT Sensor Node, Consumer Appliance User Interface, Medical Wearable Monitor, Industrial Sensor Hub, Low-Power Wireless Sensor Hub (Sub-GHz/Zigbee), Smart Home / Building Automation.
Battery-Powered IoT Sensor Node
The PIC18LF26K40-I/MV is engineered for coin-cell and 2x AA battery IoT sensor nodes where standby current dominates total energy budget. The XLP nanoWatt sleep current (~50 nA typical with RTCC and RAM retention) combined with the 1.8 V minimum VDD lets the MCU wake periodically from a PIR or accelerometer interrupt, take a sensor sample via the 10-bit ADC, transmit over a sibling BLE/RF module through the EUSART, and return to deep sleep within ~1 ms duty cycle. On a CR2032 cell, expected battery life exceeds 5 years for sub-1 Hz reporting. The 28-UQFN 4x4 mm footprint also reduces PCB area below 100 mm², enabling wearable form factors. Designers should enable peripheral module disable (PMD) for unused blocks and use the PPS subsystem to route wake-up events to the lowest-latency I/O pin.
Recommended
Consumer Appliance User Interface
For washing machine, induction cooker, and air-conditioner control panels, the PIC18LF26K40-I/MV offers enough Flash (64 KB) to hold a full state-machine plus a TFT controller library while its 5 V tolerant I/O connects directly to triac drive optocouplers and zero-cross detector inputs. The integrated 5-bit DAC and CWG simplify dimming logic for LED indicators, while the multiple CCP/PWM channels drive 7-segment multiplexed displays without external driver ICs. The 28-UQFN package fits behind capacitive touch pads where space is at a premium, and the -I/MV industrial temperature grade handles the warm interior of an appliance during continuous operation. Power sequencing on the LF variant's 1.8-3.6 V rail allows direct LDO post-regulation from the rectified 5 V mains rail.
Recommended
Medical Wearable Monitor
The PIC18LF26K40-I/MV fits continuous-wear medical patches - heart-rate straps, SpO2 finger sensors, and temperature loggers - by combining the XLP deep-sleep current with the 10-bit 24-channel ADC for electrode, photodiode, and thermistor signal chains. The 5-bit DAC supports baseline subtraction for bio-impedance measurements, while the ZCD helps synchronize optoplethysmography (PPG) sampling to AC mains rejection. With 256 bytes of EEPROM and 4 KB SRAM, the MCU captures up to several hours of trend data before bridging to BLE for cloud upload. The 28-UQFN 4x4 mm package sits within a flexible wristband module, and the -I/MV industrial temperature grade accommodates body-temperature operation up to +40 C ambient without thermal shutdown.
Recommended
Industrial Sensor Hub
In a factory-floor 4-20 mA loop transmitter or DIN-rail sensor hub, the PIC18LF26K40-I/MV hosts multi-channel ADC sampling, RTCC-tagged logging, and SPI-attached non-volatile memory in a compact footprint. The CRC/SCAN peripheral ensures data integrity for regulatory compliance, while the EUSART and I2C peripherals bridge to a backhaul RS-485 or IO-Link transceiver. Because the LF variant runs from 1.8 V to 3.6 V, the same MCU sits on 24 V loop-power designs via a switching post-regulator. The -I/MV industrial temperature range handles +85 C cabinet interiors, and the rich timer subsystem (HLT, WWDT, RTCC) supports deterministic scheduling of predictive-maintenance tasks. PPS allows trace remapping during bring-up without re-spinning the PCB.
Recommended
Low-Power Wireless Sensor Hub (Sub-GHz/Zigbee)
Recommended
Smart Home / Building Automation
For smart thermostats, blind controllers, and door-window sensors, the PIC18LF26K40-I/MV balances cost, peripheral count, and low quiescent current. Its 64 KB Flash accommodates OTA bootloader plus application, while the multi-channel PWM drives LED status indicators and small DC motors. The integrated ZCD enables zero-voltage switching for TRIAC-based mains dimming, extending bulb life in smart fixtures. With direct 3.3 V operation from AC-DC adapters or battery packs, the MCU integrates with Zigbee or BLE bridge modules over UART or SPI. The 28-UQFN package aligns with the 4 mm x 4 mm sensor puck form factor, and the -40 C to +85 C industrial grade ensures reliability across unheated attics and refrigerated garages.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF26K40-I/MV — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF26K40-E/MV | PIC18LF26K40T-I/MV | PIC18LF46K40-I/MV |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-UQFN (4x4 mm, MV) | 28-UQFN (4x4 mm, MV) - same | 28-UQFN (4x4 mm, MV) - same | 28-UQFN (4x4 mm, MV) - same |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB (same; family marker) |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB |
| Maximum Frequency | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| Supply Voltage Range | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V |
| Operating Temperature | -40C to +85C | -40C to +125C | -40C to +85C | -40C to +85C |
| Pin Compatible | Yes (reference) | Yes (drop-in) | Yes (drop-in) | Yes (drop-in) |
Key Differentiators
- Smallest footprint in K40 family at 28-UQFN 4x4 mm (vs PIC18LF26K40-I/ML)
- Low-voltage 1.8V to 3.6V native operation (vs PIC18F26K40-I/MV)
- nanoWatt XLP sleep current with RTCC retention (vs PIC18LF25K22-I/SS)
Design Notes
Estimated: at VDD = 3.3 V, 64 MHz active mode draws ~12 mA typical, while XLP sleep with RTCC drops below 100 nA (per Microchip datasheet DS40001816F). For battery-powered designs, activate PMD (peripheral module disable) for every unused peripheral before WFI, enable the DS bit (data sheet reference) in VREGCON if present, and use doze mode instead of full CPU stop whenever ADC samples can tolerate reduced throughput. A typical duty-cycled sensor node spends 99.9% of its time in deep sleep, so even a 1 mA wake-up mode pulled for 2 ms every 10 s consumes less annual energy than the sleep current itself. Place a 100 nF and 10 uF ceramic bypass pair within 5 mm of VDD and ensure VSS pin 27 connects directly to the ground plane.
The 28-UQFN 4x4 mm package has a 0.4 mm lead pitch and an exposed thermal pad that must be soldered to a thermal land on the PCB for mechanical reliability. Per Microchip app note AN-207, the recommended land pattern uses 0.2 mm wide pads with 0.2 mm spacing, and the exposed pad connects to a copper pour of at least 4 mm x 4 mm with thermal vias (0.3 mm diameter, 1.2 mm pitch array) into an inner ground plane. Reflow profile must follow JEDEC J-STD-020 MSL-3 conditions; bake-and-dry before assembly if the reel has been open more than 168 hours. A 4-layer stackup with a continuous ground plane is recommended for noise immunity even though the part itself is not a high-speed RF device.
Estimated: the PPS subsystem on the K40 family re-routes peripheral signals to almost any digital I/O pin - a benefit, but a trap for designers migrating from legacy PIC18F K22 code. Re-compile the firmware against the K40 device pack, otherwise the PPS unlock registers POR/MCLR/RPWRP remain at their defaults, and peripherals will not start. A second common pitfall is enabling the WWDT or HLT without understanding its windowed nature: writes to the watchdog key register must arrive inside the window or the part resets. Finally, always run the four-word configuration sequence ICSP disable - never leave LVPS (low-voltage programming) disabled if your debugger relies on it, and verify the BOR settings match your supply rise time.
Compliance Information
RoHS and REACH compliant per Microchip material declarations; lead-free and halogen-free per part marking on MV package. NOT AEC-Q100 qualified - select the dedicated automotive-grade K40 part for AEC-Q100 use cases. Conflict-mineral reporting follows Microchip's annual CMRT filing.
