PIC18F65K40T-I/MR - 8-Bit 64MHz MCU 32KB Flash 64-VQFN | Microchip
MPN: PIC18F65K40T-I/MR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.32 | $2.32 |
| 10 | $2.05 | $20.50 |
| 100 | $1.78 | $178.00 |
| 500 | $1.55 | $775.00 |
| 1,000 | $1.32 | $1,320.00 |
PIC18F65K40T-I/MR Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash), working RAM, EEPROM, and a rich set of peripheral IP blocks (ADC, timers, communication ports, etc.) onto one die. The PIC18 family uses Microchip's enhanced 8-bit RISC Harvard architecture and sits within the broader taxonomy: PIC18 -> 8-bit MCU -> microcontroller -> embedded computing IC -> semiconductor. The K40 sub-family adds the eXtreme Low-Power (XLP) technology and a deep set of Core Independent Peripherals (CIPs) that operate without CPU intervention.
Key features of the PIC18F65K40 include a 10-bit ADC with Computation (ADCC) supporting hardware Capacitive Voltage Divider (CVD) for touch sensing, a 5-bit DAC, two comparators, multiple PWM/CCP/CWG channels, a windowed watchdog timer (WWDT), CRC/Memory Scan, hardware Zero-Cross Detect (ZCD) and Peripheral Pin Select (PPS) for flexible signal routing. Wide operating voltage spans 2.3V to 5.5V across industrial and commercial temperature grades.
Architecturally the device uses a 16-bit instruction word with an 8-bit data path, dual-bank Flash with self-programming support, and an internal 64 MHz oscillator with PLL. The hardware CIP chain (CWG + WWDT + CRC + ZCD + PPS) lets the chip execute motor control, lighting control, capacitive touch sensing and safety monitoring tasks with near-zero CPU load, freeing the core for application logic or sleep.
Typical applications include human-machine interfaces with capacitive touch, low-power IoT sensor nodes, household appliances with zero-cross mains switching, battery-powered metering, USB/HID bridges, and general-purpose embedded control in 5V industrial systems.
When designing, choose PPS carefully to avoid peripheral-function conflicts on shared pins, and leverage the ADCC's burst-average mode to lower ADC-induced noise. Decouple VDD with a 100 nF + 1 uF pair placed within 5 mm of each power pin and connect the VQFN exposed pad to a continuous ground plane for thermal relief.
This page synthesizes distributor pricing, same-package drop-in alternatives from Microchip's K40 family and cross-brand equivalents, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for PIC18F65K40T-I/MR — 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 PIC18F65K40T-I/MR (same form factor and footprint) — differing in Package, ADC, Program Memory (Flash), Core Architecture, DAC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F66K40T-I/MR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.46 / Unit
View Datasheet →PIC18F65K40-I/MR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.3 / Unit
View Datasheet →PIC18F65K40T-I/MRVAO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F65K40-E/MR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.32 / Unit
View Datasheet →PIC18F65K40-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.95 / Unit
View Datasheet →PIC18F65K40T-I/MR Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 8-bit RISC (Harvard) |
| Program Memory (Flash) | 32 KB (16K x 16) |
| Data SRAM | 2 KB |
| Data EEPROM | 256 B |
| Maximum CPU Speed | 64 MHz (16 MIPS per the datasheet's instruction-cycle ratio) |
| Operating Voltage (VDD) | 2.3 V to 5.5 V |
| Package | 64-pin VQFN (9 x 9 mm) |
| Operating Temperature | -40C to +85C (Industrial, -I suffix) |
| ADC | 10-bit ADC with Computation (ADCC), up to 30 channels |
| DAC | 5-bit DAC |
| Comparators | 2 x comparators with selectable reference |
| PWM / CCP / CWG | Multiple CCP/ECCP, CWG (Complementary Waveform Generator) |
| Timers | Multiple 8-bit and 16-bit timers |
| Communication | UART, SPI, I2C with PPS |
| Core Independent Peripherals | CWG, WWDT, CRC/Memory Scan, ZCD, Hardware CVD, PPS |
| Low-Power Technology | XLP (eXtreme Low-Power) |
| Windowed Watchdog (WWDT) | Yes |
| Zero-Cross Detect (ZCD) | Yes |
| Peripheral Pin Select (PPS) | Yes |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC18F65K40T-I/MR Pin Configuration
| Pin 1 | RC6/TX1/CWG1H/PPS_OUT — GPIO RC6 / UART1 TX / CWG output / PPS output |
| Pin 2 | RC7/RX1/PPS_IN — GPIO RC7 / UART1 RX / PPS input |
| Pin 3 | RB0/CCP4/IN0+/PPS — GPIO RB0 / CCP4 / comparator IN0+ / PPS |
| Pin 4 | RB1/CCP5/IN0-/PPS — GPIO RB1 / CCP5 / comparator IN0- / PPS |
| Pin 5 | RB2/IN1+/PPS — GPIO RB2 / comparator IN1+ / PPS |
| Pin 6 | RB3/IN1-/PPS — GPIO RB3 / comparator IN1- / PPS |
| Pin 7 | RB4/IN2+/PPS — GPIO RB4 / comparator IN2+ / PPS |
| Pin 8 | RB5/IN2-/PPS — GPIO RB5 / comparator IN2- / PPS |
| Pin 9 | RB6/ICDCLK — GPIO RB6 / ICD clock |
| Pin 10 | RB7/ICDDAT — GPIO RB7 / ICD data |
| Pin 11 | VDD — Core supply voltage |
| Pin 12 | VSS — Ground reference |
| Pin 13 | RA0/AN0/C1IN0+ — GPIO RA0 / analog AN0 / comparator C1 IN0+ |
| Pin 14 | RA1/AN1/C1IN0- — GPIO RA1 / analog AN1 / comparator C1 IN0- |
| Pin 15 | RA2/AN2/DAC1OUT1 — GPIO RA2 / analog AN2 / DAC1 output 1 |
| Pin 16 | RA3/AN3/DAC1OUT2 — GPIO RA3 / analog AN3 / DAC1 output 2 |
| Pin 17 | RA4/AN4/C1OUT — GPIO RA4 / analog AN4 / comparator C1 output |
| Pin 18 | RA5/AN5/C2OUT — GPIO RA5 / analog AN5 / comparator C2 output |
| Pin 19 | RA6/AN6 — GPIO RA6 / analog AN6 |
| Pin 20 | RA7/AN7 — GPIO RA7 / analog AN7 |
| Pin 21 | VSS — Ground reference |
| Pin 22 | VDD — Core supply voltage |
| Pin 23 | RC0/PWM3/PPS — GPIO RC0 / PWM3 output / PPS |
| Pin 24 | RC1/PWM4/PPS — GPIO RC1 / PWM4 output / PPS |
| Pin 25 | RC2/PWM5/PPS — GPIO RC2 / PWM5 output / PPS |
| Pin 26 | RC3/PWM6/PPS — GPIO RC3 / PWM6 output / PPS |
| Pin 27 | RC4/PPS — GPIO RC4 / PPS |
| Pin 28 | RC5/PPS — GPIO RC5 / PPS |
| Pin 29 | RD0/AN20/ADCCPPS — GPIO RD0 / analog AN20 / ADCC trigger PPS |
| Pin 30 | RD1/AN21/PPS — GPIO RD1 / analog AN21 / PPS |
| Pin 31 | RD2/AN22/PPS — GPIO RD2 / analog AN22 / PPS |
| Pin 32 | RD3/AN23/PPS — GPIO RD3 / analog AN23 / PPS |
| Pin 33 | RD4/AN24/PPS — GPIO RD4 / analog AN24 / PPS |
| Pin 34 | RD5/AN25/PPS — GPIO RD5 / analog AN25 / PPS |
| Pin 35 | RD6/AN26/PPS — GPIO RD6 / analog AN26 / PPS |
| Pin 36 | RD7/AN27/PPS — GPIO RD7 / analog AN27 / PPS |
| Pin 37 | RE0/AN28 — GPIO RE0 / analog AN28 |
| Pin 38 | RE1/AN29 — GPIO RE1 / analog AN29 |
| Pin 39 | RE2/AN30 — GPIO RE2 / analog AN30 |
| Pin 40 | RE3/AN31 — GPIO RE3 / analog AN31 |
| Pin 41 | VSS — Ground reference |
| Pin 42 | VDD — Core supply voltage |
| Pin 43 | RF0/AN32 — GPIO RF0 / analog AN32 |
| Pin 44 | RF1/AN33 — GPIO RF1 / analog AN33 |
| Pin 45 | RF2/AN34 — GPIO RF2 / analog AN34 |
| Pin 46 | RF3/AN35 — GPIO RF3 / analog AN35 |
| Pin 47 | RF4/AN36/PPS — GPIO RF4 / analog AN36 / PPS |
| Pin 48 | RF5/AN37/PPS — GPIO RF5 / analog AN37 / PPS |
| Pin 49 | RF6/AN38/PPS — GPIO RF6 / analog AN38 / PPS |
| Pin 50 | RF7/AN39/PPS — GPIO RF7 / analog AN39 / PPS |
| Pin 51 | RG0/PPS — GPIO RG0 / PPS |
| Pin 52 | RG1/PPS — GPIO RG1 / PPS |
| Pin 53 | RG2/PPS — GPIO RG2 / PPS |
| Pin 54 | RG3/PPS — GPIO RG3 / PPS |
| Pin 55 | RG4/PPS — GPIO RG4 / PPS |
| Pin 56 | RG5/PPS — GPIO RG5 / PPS |
| Pin 57 | RH0/PPS — GPIO RH0 / PPS |
| Pin 58 | RH1/PPS — GPIO RH1 / PPS |
| Pin 59 | RH2/PPS — GPIO RH2 / PPS |
| Pin 60 | RH3/PPS — GPIO RH3 / PPS |
| Pin 61 | OSC1/CLKIN — Crystal oscillator input |
| Pin 62 | OSC2/CLKOUT — Crystal oscillator output |
| Pin 63 | MCLR — Master clear (reset) input |
| Pin 64 | EP — Exposed thermal pad - tie to ground |
Typical Applications
PIC18F65K40T-I/MR is suitable for 6 applications: Capacitive Touch Human-Machine Interface, Low-Power IoT Sensor Nodes, Household Appliance with Zero-Cross Switching, Battery-Powered Metering and Data Logging, USB/HID Bridge and PC Peripherals, Industrial 5V Control Systems.
Capacitive Touch Human-Machine Interface
The PIC18F65K40T-I/MR fits capacitive touch HMI panels because its 10-bit ADCC peripheral executes hardware Capacitive Voltage Divider (CVD) scans without CPU load, allowing 30+ touch channels to be polled in parallel. With 2 KB of SRAM and 32 KB of Flash the MCU can store touch gesture libraries, run a small UI state machine and drive an SPI/I2C TFT. The XLP nanoWatt technology drops average current to single-digit uA between scans, making battery-powered remote controls viable. Designers route the touch sensors via Peripheral Pin Select (PPS) for flexible PCB layout, and use the on-chip CRC/Memory Scan to verify firmware integrity at boot for functional-safety ready products.
Recommended
Low-Power IoT Sensor Nodes
Battery-powered IoT sensor nodes leverage the PIC18F65K40T-I/MR's XLP (eXtreme Low-Power) technology, with sleep currents in the sub-uA range and active currents below 50 uA/MHz at 3.3 V. The 64 MHz CPU executes burst-mode sensor reads in microseconds before returning to sleep, extending coin-cell life to multi-year runtimes. On-chip ADCC samples analog sensors, I2C/SPI ports talk to digital sensors, and the 256-byte EEPROM stores calibration constants and unique device IDs. The PPS block reassigns peripheral pins for compact 2-layer PCB layouts, while hardware CRC plus WWDT deliver the integrity and watchdog coverage required for unattended field deployments.
Recommended
Household Appliance with Zero-Cross Switching
The PIC18F65K40T-I/MR is well-suited to mains-powered appliances because its on-chip Zero-Cross Detect (ZCD) peripheral synchronizes triac firing to the AC line crossing, reducing EMI and relay stress. The CWG (Complementary Waveform Generator) produces the complementary drive signals needed for PFC or full-bridge topologies, while the 5-bit DAC and two comparators implement closed-loop current limiting. With 64-pin VQFN (9x9) package, the MCU integrates the entire appliance controller - user I/O, drive logic and safety - onto a single small footprint. The industrial -40C to +85C temperature grade handles the under-cabinet thermal environment of washers, dishwashers and induction cooktops.
Recommended
Battery-Powered Metering and Data Logging
The PIC18F65K40T-I/MR powers battery-driven metering applications - water, gas and energy meters - by combining XLP low-power operation with 32 KB of Flash for ModBus or wireless protocol stacks. The 10-bit ADCC accurately samples front-end analog signals, the 5-bit DAC provides excitation for resistive bridges, and the 256-byte EEPROM stores non-volatile meter constants, tariffs and tamper logs. The hardware CRC/Memory Scan peripheral validates firmware integrity on every wake-up, supporting utility-grade security requirements. 2 KB of SRAM buffers measurement samples between radio transmissions, and PPS routes the UART/SPI/I2C peripherals to any available pin for flexible PCB antennas.
Recommended
USB/HID Bridge and PC Peripherals
In USB HID bridges such as custom keyboards, HID-class game controllers and HID-to-UART adapters, the PIC18F65K40T-I/MR delivers the 64 MHz compute headroom required by software USB stacks and HID report parsers. Its 2 KB of SRAM accommodates HID ring buffers, while 32 KB of Flash holds the USB stack, HID descriptors and application logic. The on-chip comparators monitor VBUS for plug/unplug events without external circuitry, and the PPS block maps the USB D+/D- lines to any two I/O pins. The industrial temperature grade and wide 2.3-5.5 V supply simplify integration into industrial PCs, point-of-sale terminals and ruggedized human-interface devices.
Recommended
Industrial 5V Control Systems
The PIC18F65K40T-I/MR targets 5V industrial PLC-style control systems because it operates natively across the 2.3 V to 5.5 V range and ships in a 64-pin VQFN that drops onto small form-factor controller boards. The integrated ADCC reads 4-20 mA analog inputs with hardware averaging, the 5-bit DAC drives setpoint outputs, and the dual comparators handle over-current/over-voltage faults. The CWG and CCP peripherals produce precise PWM signals for motor pre-drivers, while the on-chip WWDT and CRC/Memory Scan support functional-safety documentation. PPS reassigns peripheral functions to alternative pins, simplifying PCB routing around isolation barriers and connector placements.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F65K40T-I/MR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F66K40T-I/MR | PIC18F65K40-I/MR | PIC18F65K40T-I/MRVAO | PIC18F65K40-E/MR | PIC18F65K40-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | VQFN-64 (9x9) | VQFN-64 (9x9) | VQFN-64 (9x9) | VQFN-64 (9x9) | VQFN-64 (9x9) | TQFP-64 (10x10) |
| Core Architecture | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit |
| Max CPU Speed | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| Program Memory (Flash) | 32 KB | 64 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| Data SRAM | 2 KB | 4 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| Operating Voltage | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +125C | -40C to +85C |
| XLP Low-Power Technology | Yes | Yes | Yes | Yes | Yes | Yes |
| 10-bit ADCC + CVD | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Industrial-grade 64-pin VQFN (9x9 mm) with XLP low-power platform (vs PIC18F65K22-I/MR)
- Drop-in upgrade path to 64 KB Flash within identical package (vs PIC18F65K40-I/PT (TQFP))
- Extended -40C to +125C grade available without changing footprint (vs PIC18F65K40T-I/MRVAO)
Design Notes
Decouple every VDD/VSS pair with a 100 nF X7R ceramic placed within 5 mm of each pin and a shared 1 uF bulk capacitor at the VQFN-64 entry point. For the industrial 2.3-5.5 V range, add a 10 uF tantalum or polymer capacitor at the regulator output to absorb the inrush current from the 64 MHz core during wake-up. Tie the exposed thermal pad (EP) directly to the ground plane with at least 9 thermal vias arranged in a 3x3 grid to keep theta_JA low and prevent thermal shutdown when the CWG and ADCC peripherals run simultaneously.
Route the 64-pin VQFN (9x9 mm) on a 4-layer PCB with a continuous ground plane directly under the package to control the impedance of PPS-mapped SPI/I2C traces. Keep the OSC1/OSC2 crystal traces under 5 mm and surround them with a ground guard ring to suppress radiated noise into the ADCC analog inputs. Place the MCLR pull-up within 10 mm of pin 63 and add a 100 nF cap on MCLR if the trace exceeds 25 mm to filter ESD events during in-circuit programming.
When configuring Peripheral Pin Select (PPS), always unlock the PPS register sequence (write 0x55 then 0xAA to PPSLOCK) before writing to RPINR/RPOR registers, or the writes are silently dropped. Enable the Windowed Watchdog (WWDT) early in firmware to recover from brown-outs that may corrupt PPS configuration. Do not exceed the 5.5 V absolute maximum on any analog or digital pin; transient suppression on the MCLR pin is mandatory in industrial environments to prevent latch-up during hot-plug events.
For capacitive touch sensing via ADCC hardware CVD, use guarded sensor traces with a ground-fill shield on both sides and route them on the top layer only - via stitching on each side of the trace reduces crosstalk from adjacent PWM or triac-drive signals. Average at least 16 ADCC samples per channel and run the CVD scan in sleep mode between conversions to suppress digital-noise coupling into the analog result. Use the on-chip DAC1 to bias the CVD reference rather than VDD, which is noisy under PWM switching loads.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified as standard grade; choose the automotive-grade PIC18F65K40T-I/MRVAO or PIC18F65K40-E/MR with AEC-Q100 documentation for automotive designs.
