PIC18F66K40-E/PT - 64KB Flash 8-bit XLP MCU | Microchip
MPN: PIC18F66K40-E/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.62 | $4.62 |
| 10 | $4.1 | $41.00 |
| 100 | $3.42 | $342.00 |
| 500 | $3.05 | $1,525.00 |
| 1,000 | $2.78 | $2,780.00 |
PIC18F66K40-E/PT Overview
What is a PIC18 XLP microcontroller? The XLP family is Microchip's ultra-low-power PIC18 sub-family built on an enhanced Harvard RISC architecture with a modified instruction set. It belongs to the broader taxonomy: 8-bit microcontroller -> embedded MCU -> integrated circuit. XLP parts are designed for battery-powered and energy-harvesting applications where nanoWatt sleep currents (below ~50 nA typical) and rapid wake-up times extend operating life. The PIC18F66K40 combines this low-power DNA with rich analog and digital peripheral integration, making it a flexible general-purpose controller.
Key features include 64KB self-programmable Flash (via ICSP), 4KB SRAM, 256B EEPROM, a 10-bit ADC2 with up to 16 channels, 5-bit DAC, two comparators with selectable reference, three PWM modules, three CCP modules, CWG, HLT, WWDT, SCAN/CRC for memory integrity, ZCD for AC line sensing, and up to 60 I/O pins. The device supports serial interfaces including I2C, SPI, and EUSART with auto-baud detect, and provides flexible oscillator options including internal 64 MHz HFINTOSC and a 31 kHz LFINTOSC for low-power sleep.
Architecturally, the PIC18F66K40 uses Microchip's enhanced 8-bit RISC core with a hardware multiplier, single-cycle instruction execution at 64 MHz (15.6 ns instruction cycle), and a 31-level hardware stack. The integrated CIPs (Core Independent Peripherals) such as CWG, HLT, ZCD, and SCAN/CRC operate without CPU intervention, offloading real-time tasks and freeing the core for higher-level application logic. The 5V tolerance and XLP nanoWatt technology allow direct interfacing with analog and AC-line-powered signals in harsh environments.
Typical applications include industrial automation and control, low-power sensor nodes, IoT edge devices, smart energy metering, lighting and ballast control, white goods and home appliances, automotive body and comfort modules (industrial-grade only), and human-machine interface (HMI) panels where the rich peripheral set replaces multiple discrete components.
When designing with this MCU, allocate sufficient decoupling (100 nF + bulk) near each VDD pin pair and follow Microchip's TQFP-EP thermal pad layout guidelines if migrating from a non-EP variant. Use ICSP programming pins for in-circuit firmware updates during development.
This page synthesizes distributor pricing, drop-in alternatives from the same PIC18 K40 family, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for PIC18F66K40-E/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 PIC18F66K40-E/PT (same form factor and footprint) — differing in ADC, Package, Comparators, Core, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F66K40-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F66K40T-I/PT
✅ Drop-In✓ In Stock
$2.52 / Unit
View Datasheet →PIC18F67K40-I/PT
✅ Drop-In✓ In Stock
$2.78 / Unit
View Datasheet →PIC18F65K40-I/PT
✅ Drop-In✓ In Stock
$2.55 / Unit
View Datasheet →PIC18F66K22-I/PT
✅ Drop-In✓ In Stock
$3.96 / Unit
View Datasheet →PIC18F66K40-E/PT Maximum Ratings & Electrical Characteristics
| Core | PIC18 8-bit RISC (enhanced Harvard) |
| Instruction Cycle Speed | 64 MHz (15.6 ns instruction cycle) |
| Program Flash | 64 KB |
| RAM | 4 KB |
| EEPROM | 256 B |
| Pin Count | 64 |
| Package | TQFP-64 (PT) 10x10 mm |
| Supply Voltage (VDD) | 1.8 V to 5.5 V |
| Operating Temperature | -40 C to +125 C (Industrial, -E grade) |
| I/O Pins | Up to 60 |
| ADC | 10-bit ADC2, up to 16 channels |
| DAC | 5-bit |
| Comparators | 2 with selectable reference |
| PWM Modules | 3 |
| CCP Modules | 3 |
| Core Independent Peripherals | CWG, HLT, WWDT, SCAN/CRC, ZCD |
| Serial Interfaces | I2C, SPI, EUSART (auto-baud) |
| Oscillator | 64 MHz HFINTOSC, 31 kHz LFINTOSC, PLL, external |
| Technology Family | PIC XLP (eXtreme Low Power) nanoWatt |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| MSL Level | 3 (168 hours) |
PIC18F66K40-E/PT Pin Configuration
| Pin 1 | RC0 — Digital I/O / SOSCO (SOS oscillator output) |
| Pin 2 | RC1 — Digital I/O / SOSCI (SOS oscillator input) |
| Pin 3 | RC2 — Digital I/O / CCP1 |
| Pin 4 | RC3 — Digital I/O / SCL1 (I2C clock) |
| Pin 5 | RC4 — Digital I/O / SDA1 (I2C data) |
| Pin 6 | RC5 — Digital I/O / SDO1 (SPI data out) |
| Pin 7 | RC6 — Digital I/O / TX1 (EUSART transmit) |
| Pin 8 | RC7 — Digital I/O / RX1 (EUSART receive) |
| Pin 9 | RE0 — Digital I/O / PWM3 |
| Pin 10 | RE1 — Digital I/O / PWM4 |
| Pin 11 | RE2 — Digital I/O |
| Pin 12 | RE3 — Digital I/O |
| Pin 13 | RA0 — Digital I/O / AN0 (ADC2 input) |
| Pin 14 | RA1 — Digital I/O / AN1 |
| Pin 15 | RA2 — Digital I/O / AN2 / VREF- |
| Pin 16 | RA3 — Digital I/O / AN3 / VREF+ |
| Pin 17 | RA4 — Digital I/O / AN4 |
| Pin 18 | RA5 — Digital I/O / AN5 |
| Pin 19 | RA6 — Digital I/O / OSC2 (crystal output) |
| Pin 20 | RA7 — Digital I/O / OSC1 (crystal input) |
| Pin 21 | VDD — Positive supply voltage |
| Pin 22 | VSS — Ground reference |
| Pin 23 | RB0 — Digital I/O / AN12 / ZCD |
| Pin 24 | RB1 — Digital I/O / AN10 / C1IN1- |
| Pin 25 | RB2 — Digital I/O / AN8 / C1IN2- |
| Pin 26 | RB3 — Digital I/O / AN9 / C2IN1- |
| Pin 27 | RB4 — Digital I/O / AN11 |
| Pin 28 | RB5 — Digital I/O / AN13 |
| Pin 29 | RB6 — Digital I/O / ICSPCLK (programming clock) |
| Pin 30 | RB7 — Digital I/O / ICSPDAT (programming data) |
| Pin 31 | VDD — Positive supply voltage |
| Pin 32 | VSS — Ground reference |
| Pin 33 | RC0 — Digital I/O |
| Pin 34 | RD0 — Digital I/O |
| Pin 35 | RD1 — Digital I/O |
| Pin 36 | RD2 — Digital I/O |
| Pin 37 | RD3 — Digital I/O |
| Pin 38 | RD4 — Digital I/O |
| Pin 39 | RD5 — Digital I/O |
| Pin 40 | RD6 — Digital I/O |
| Pin 41 | RD7 — Digital I/O |
| Pin 42 | VSS — Ground reference |
| Pin 43 | VDD — Positive supply voltage |
| Pin 44 | RF0 — Digital I/O |
| Pin 45 | RF1 — Digital I/O / AN6 |
| Pin 46 | RF2 — Digital I/O / AN7 |
| Pin 47 | RF3 — Digital I/O / AN14 |
| Pin 48 | RF4 — Digital I/O / AN15 |
| Pin 49 | RF5 — Digital I/O / AN16 |
| Pin 50 | RF6 — Digital I/O / AN17 |
| Pin 51 | RF7 — Digital I/O |
| Pin 52 | RG0 — Digital I/O |
| Pin 53 | RG1 — Digital I/O |
| Pin 54 | RG2 — Digital I/O |
| Pin 55 | RG3 — Digital I/O |
| Pin 56 | RG4 — Digital I/O |
| Pin 57 | RG5 — Digital I/O |
| Pin 58 | RG6 — Digital I/O |
| Pin 59 | RG7 — Digital I/O |
| Pin 60 | VSS — Ground reference |
| Pin 61 | VDD — Positive supply voltage |
| Pin 62 | RA0 — Digital I/O |
| Pin 63 | RA1 — Digital I/O |
| Pin 64 | RA2 — Digital I/O |
Typical Applications
PIC18F66K40-E/PT is suitable for 6 applications: Industrial Automation and Control, Low-Power IoT Sensor Nodes, Smart Energy Metering, Lighting and Ballast Control, Home Appliance and White Goods HMI, Automotive Body and Comfort Modules.
Industrial Automation and Control
The PIC18F66K40-E/PT is well suited to industrial automation because its 64 KB Flash and 4 KB RAM accommodate Modbus RTU / CANopen-style state machines, while its -40 C to +125 C industrial temp grade tolerates factory-floor heat. The 10-bit ADC2 with up to 16 channels reads 4-20 mA loop signals via shunt resistors; the 5-bit DAC drives analog setpoints to motor controllers; and three PWM plus three CCP modules generate the timing signals for stepper or BLDC commutation. The integrated CWG (Complementary Waveform Generator) with hardware dead-band produces anti-shoot-through gate drive for half-bridges without software latency. ZCD (Zero-Cross Detect) senses AC-line zero crossings for synchronous triac firing in heater or solenoid drivers, eliminating inrush and EMI.
Recommended
Low-Power IoT Sensor Nodes
The PIC18F66K40-E/PT is a strong fit for battery-powered IoT sensor nodes thanks to its XLP nanoWatt technology, with sleep currents typically below 50 nA on the 31 kHz LFINTOSC and rapid wake-up to 64 MHz via HFINTOSC plus PLL. The 10-bit ADC2 can sample thermistor, photodiode, or soil-moisture sensors directly, while Core Independent Peripherals (HLT, ZCD, SCAN/CRC) handle event-driven sensing and memory integrity checks without CPU intervention, keeping the core asleep. The EUSART with auto-baud detect interfaces to sub-GHz transceivers or Wi-Fi co-processors over UART, and the 4 KB RAM is sufficient for LoRaWAN / Zigbee stacks. Two comparators with selectable reference enable threshold-based wake-up from sleep on sensor excursions.
Recommended
Smart Energy Metering
The PIC18F66K40-E/PT fits smart energy metering because its ZCD (Zero-Cross Detect) peripheral senses AC mains zero crossings to synchronize energy accumulation without CPU load, and its 5-bit DAC plus two comparators support calibration and tamper detection on current shunts or CTs. The 64 KB Flash accommodates IEC 62053-21/22 metering algorithms and DLMS/COSEM-style communication stacks, while 4 KB RAM buffers measurement samples between transmissions. The CWG peripheral can drive a solid-state relay with anti-shoot-through protection for load switching, and the WWDT (Windowed Watchdog Timer) with SCAN/CRC detects firmware corruption in unattended field installations. 1.8-5.5 V VDD allows direct Li-ion or 3.6 V Li-SOCl2 battery operation.
Recommended
Lighting and Ballast Control
The PIC18F66K40-E/PT is well matched to LED drivers and electronic ballasts because its 3 PWM modules plus the CWG (Complementary Waveform Generator) generate the high-frequency switching waveforms for boost/PFC stages and the half-bridge lamp drivers, while the ZCD synchronizes to the AC line for valley-fill PFC and dimmer phase-cut detection. The 10-bit ADC2 reads LED current via sense resistors to implement constant-current feedback loops, and the 5-bit DAC sets dimming targets in 32 brightness steps or 0-10 V analog dim inputs. Hardware Limit Timer (HLT) provides deterministic PWM shutdown on overcurrent events within microseconds - critical for Class 2 safety isolation in LED luminaires.
Recommended
Home Appliance and White Goods HMI
The PIC18F66K40-E/PT suits white-goods HMI panels because its 60 I/O pins can directly scan a 7-segment or matrix keypad plus drive up to 60 LEDs or 8-digit 7-segment displays without external logic. The EUSART, SPI, and I2C peripherals connect to segment LCD drivers, Wi-Fi modules for smart-appliance connectivity, and the main appliance control board; the on-board 5-bit DAC drives audio beepers for end-of-cycle alerts. Core Independent Peripherals like CWG and HLT handle motor-control interlocks and over-temperature shutdowns autonomously, while the -40 C to +125 C industrial temp grade tolerates the oven, dishwasher, or refrigerator compartments. 64 KB Flash supports multi-language UI strings and OTA-capable firmware updates.
Recommended
Automotive Body and Comfort Modules
The PIC18F66K40-E/PT is appropriate for non-safety automotive body and comfort modules such as interior lighting controllers, seat-position memories, mirror adjusters, and rain/light sensors, thanks to its 5V tolerance, -40 C to +125 C industrial temp grade, and integrated CAN-ready peripherals (via EUSART + external CAN controller). The 10-bit ADC2 reads potentiometers for seat position, photodiodes for auto-headlight dim, and thermistors for cabin climate; the CWG drives small DC motor bridges with anti-shoot-through protection; and the 64 KB Flash stores calibration tables and fault logs. WWDT and SCAN/CRC meet the reliability expectations of body-electronics ECU firmware. For safety-critical ADAS or powertrain, migrate to AEC-Q100-qualified parts.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F66K40-E/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F66K40-I/PT | PIC18F66K40T-I/PT | PIC18F67K40-I/PT | PIC18F65K40-I/PT | PIC18F66K22-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-64 (PT) 10x10 mm | TQFP-64 (PT) 10x10 mm - same | TQFP-64 (PT) 10x10 mm - same | TQFP-64 (PT) 10x10 mm - same | TQFP-64 (PT) 10x10 mm - same | TQFP-64 (PT) 10x10 mm - same |
| Program Flash | 64 KB | 64 KB | 64 KB | 128 KB | 64 KB | 64 KB |
| RAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| Max CPU Clock | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| I/O Pins | 60 | 60 | 60 | 60 | 50 | 53 |
| Temperature Grade | -40C to +125C (-E) | -40C to +85C (-I) | -40C to +85C (-I) | -40C to +85C (-I) | -40C to +85C (-I) | -40C to +85C (-I) |
| Core Independent Peripherals | CWG, HLT, WWDT, SCAN/CRC, ZCD | CWG, HLT, WWDT, SCAN/CRC, ZCD - same | CWG, HLT, WWDT, SCAN/CRC, ZCD - same | CWG, HLT, WWDT, SCAN/CRC, ZCD - same | CWG, HLT, WWDT, SCAN/CRC, ZCD - same | Missing CWG, HLT, SCAN/CRC, ZCD |
| Supply Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
Key Differentiators
- Full -40C to +125C industrial temperature grade at the same die (vs PIC18F66K40-I/PT)
- Doubles to 128 KB Flash on the same TQFP-64 footprint (vs PIC18F67K40-I/PT)
- Adds 4 new Core Independent Peripherals vs older K22 family (vs PIC18F66K22-I/PT)
Design Notes
Place a 100 nF decoupling capacitor as close as possible to each VDD pin pair (pin 21/22, pin 31/32, pin 42/43, pin 60/61) and a single 10 uF bulk capacitor near the largest VDD cluster. The PIC18F66K40-E/PT has four VDD/VSS pairs distributed across the TQFP-64 footprint to reduce ground bounce; ignoring the inner pairs typically manifests as ADC2 noise or PWM jitter under load. For battery operation add a 10 uF hold-up capacitor on VDD to survive sleep-to-active current transients up to ~10 mA.
Estimated: at maximum 64 MHz CPU clock with all peripherals active and GPIO toggling, the PIC18F66K40-E/PT draws roughly 10-15 mA from VDD (~50 mW at 3.3 V). The TQFP-64 (PT) 10x10 mm package has a theta_JA around 45-50 C/W on a 4-layer 1 oz PCB with no thermal pad, meaning a junction temperature rise of ~3 C above ambient. In enclosed industrial enclosures above 60 C ambient, derate the clock to 32 MHz or add a small copper flood under the exposed pad (if migrating from an EP variant) to keep Tj under the 125 C max.
Do not leave the ICSP/ICD pins (RB6/RB7) floating in production designs without 10 kohm pull-ups; some programmers require these to be pulled low/high during reset entry. The MCLR pin (RE3 on this package) must have a 10-50 kohm pull-up to VDD for normal operation and a 100 nF cap to ground for ESD robustness; leaving it floating prevents the device from exiting Reset. When migrating from PIC18F66K22 code, verify that the new K40 peripheral names (CWG, HLT, ZCD, SCAN/CRC) are configured correctly - register addresses differ between the K22 and K40 families.
Route the 16 MHz external crystal traces (RA6/RA7) as short and symmetric as possible, with a ground guard ring on both sides and ground flood on the layer below. Keep ADC2 analog traces (AN0-AN17) away from PWM and PWM3/PWM4 switching traces; use a 100 nF + 10 uF RC anti-aliasing filter on analog inputs that switch impedance mid-sampling. Place the 31 kHz LFINTOSC crystal or external 32.768 kHz watch crystal away from the HFINTOSC trace to avoid beat-frequency coupling that can wake the device falsely from sleep.
Compliance Information
RoHS and REACH compliant per Microchip product page. Lead-free and halogen-free packaging. The -E temperature grade is industrial (-40 C to +125 C) but the part is NOT AEC-Q100 qualified; for AEC-Q100 automotive safety applications use a Q-qualified PIC18 derivative instead.
