PIC18F66K40-E/PTVAO - 64KB Flash 8-bit MCU TQFP-64 | Microchip
MPN: PIC18F66K40-E/PTVAO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.1 | $5.10 |
| 10 | $4.65 | $46.50 |
| 100 | $3.95 | $395.00 |
| 500 | $3.4 | $1,700.00 |
| 1,000 | $2.95 | $2,950.00 |
PIC18F66K40-E/PTVAO Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory (Flash), volatile data memory (SRAM), EEPROM, and a fixed set of peripherals on one silicon die. The PIC18F K40 family sits in the PIC18 hierarchy as PIC18F -> 8-bit PIC microcontroller -> PIC microcontroller -> microcontroller -> embedded processor. These MCUs target ultra-low-power eXtreme Low Power (XLP) battery designs as well as mainstream 5V general-purpose applications, where rich analog (10-bit ADC with Computation, 5-/8-bit DAC, comparators) and timer-based CIPs replace software loops with hardware state machines.
Key differentiating features of the PIC18F66K40 include 64KB self-programmable Flash with device ID/live update, 4KB SRAM, 1KB EEPROM, 10-bit ADC2 with automated Capacitive Voltage Divider (CVD) support, 8-bit DAC, dual comparators with selectable rail-to-rail inputs, 4 CCP/ECCP, 2 UART, 2 SPI, 2 I2C (MSSP), 4 16-bit timers, and a Windowed Watchdog Timer (WWDT). Operating current is approximately 5 mA at 64 MHz / 5V, with sleep currents below 1 uA typical under XLP retention modes.
The CIP-rich architecture lets designers implement waveform generation, touch sensing (via mTouch CVD), communications bridging, and motor control without CPU intervention, reducing firmware complexity and BOM cost. Hardware CRC/SCAN and CLC (Configurable Logic Cell) further consolidate glue logic that traditionally required external gates or a companion CPLD.
Typical applications include consumer appliances, IoT sensor nodes, white-goods human-machine interfaces, automotive body and interior modules, lighting controllers, and small motor control (BLDC, fan). The 5V-tolerant digital pins and 5V analog rail simplify interface to legacy industrial sensors, while XLP retention supports battery-backed metering and remote controls.
Design considerations: at 64 MHz the core draws roughly 5 mA at 5V (~25 mW); a decoupling network of 100 nF + 1 uF + 10 uF near VDD/AVDD is recommended, and unused pins must be configured as outputs low to avoid shoot-through. For programming, MPLAB X IDE with XC8 and the PICkit 4 / ICD 4 / Snap debugger are first-choice tools.
This page combines distributor pricing snapshots, drop-in TQFP-64 alternatives, and design notes compiled from the Microchip PIC18F66K40 datasheet family, offering context not aggregated on a single manufacturer page.
Drop-in alternatives for PIC18F66K40-E/PTVAO — 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/PTVAO (same form factor and footprint) — differing in ADC, Operating Temperature, Package, Timers, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F66K40-E/PT
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View Datasheet →PIC18F65K22-E/PT
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View Datasheet →PIC18F66K22-I/PT
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View Datasheet →PIC18F6628-E/PT
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View Datasheet →PIC18F66K40-E/PTVAO Maximum Ratings & Electrical Characteristics
| Core | PIC18 8-bit RISC |
| Program Memory (Flash) | 64 KB |
| SRAM | 4 KB |
| EEPROM | 1 KB |
| Maximum CPU Speed | 64 MHz |
| Operating Voltage Range | 2.3 V to 5.5 V |
| Package | TQFP-64 (10x10 mm, 0.5 mm pitch) |
| I/O Pins | Up to 60 |
| ADC | 10-bit ADC2 with Computation, up to 47 channels |
| DAC | 8-bit DAC, 1 channel |
| Comparators | 2 with selectable input source |
| Timers | 4 x 16-bit / 2 x 8-bit |
| Capture/Compare/PWM | 4 CCP / 2 ECCP |
| UART | 2 |
| SPI | 2 (MSSP) |
| I2C | 2 (MSSP) |
| Core Independent Peripherals | CWG, WWDT, CRC/SCAN, SMT, HLT, ZCD, CLC |
| Windowed Watchdog Timer (WWDT) | Yes |
| Low-Power Technology | XLP (eXtreme Low Power) |
| Operating Temperature Range | -40 C to +125 C (E suffix = Extended) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| MSL Level | 3 (per JEDEC J-STD-020) |
PIC18F66K40-E/PTVAO Pin Configuration
| Pin 1 | RC0 — Digital I/O / CCP1 / AN12 |
| Pin 2 | RC1 — Digital I/O / CCP2 / AN13 |
| Pin 3 | RC2 — Digital I/O / AN14 / CCP3 |
| Pin 4 | RC3 — Digital I/O / SCL1 / AN15 |
| Pin 5 | RC4 — Digital I/O / SDA1 / AN16 |
| Pin 6 | RC5 — Digital I/O / SDO1 / AN17 |
| Pin 7 | RC6 — Digital I/O / TX1 / CK1 |
| Pin 8 | RC7 — Digital I/O / RX1 / DT1 |
| Pin 9 | RE0 — Digital I/O / AN5 / CCP2 |
| Pin 10 | RE1 — Digital I/O / AN6 / CCP3 |
| Pin 11 | RE2 — Digital I/O / AN7 / CCP4 |
| Pin 12 | RE3 — Digital I/O / AN8 / CCP5 |
| Pin 13 | RE4 — Digital I/O / AN9 / CCP6 |
| Pin 14 | RE5 — Digital I/O / AN10 / CCP7 |
| Pin 15 | RE6 — Digital I/O / AN11 / CCP8 |
| Pin 16 | RE7 — Digital I/O / AN12 / CCP9 |
| Pin 17 | VDD — Digital supply voltage (2.3 V to 5.5 V) |
| Pin 18 | VSS — Digital ground reference |
| Pin 19 | RA0 — Digital I/O / AN0 / ULPWU |
| Pin 20 | RA1 — Digital I/O / AN1 |
| Pin 21 | RA2 — Digital I/O / AN2 / DACOUT |
| Pin 22 | RA3 — Digital I/O / AN3 / VREF+ |
| Pin 23 | RA4 — Digital I/O / AN4 / T0CKI |
| Pin 24 | RA5 — Digital I/O / AN5 / T1CKI |
| Pin 25 | RA6 — Digital I/O / OSC2 / CLKR |
| Pin 26 | RA7 — Digital I/O / OSC1 / CLKI |
| Pin 27 | VSS — Digital ground reference |
| Pin 28 | VDD — Digital supply voltage |
| Pin 29 | RB0 — Digital I/O / INT0 / AN8 |
| Pin 30 | RB1 — Digital I/O / INT1 / AN9 |
| Pin 31 | RB2 — Digital I/O / INT2 / AN10 |
| Pin 32 | RB3 — Digital I/O / INT3 / AN11 |
| Pin 33 | RB4 — Digital I/O / AN12 |
| Pin 34 | RB5 — Digital I/O / AN13 / CCP5 |
| Pin 35 | RB6 — Digital I/O / PGC / ICDCLK |
| Pin 36 | RB7 — Digital I/O / PGD / ICDDATA |
| Pin 37 | AVDD — Analog supply voltage |
| Pin 38 | AVSS — Analog ground reference |
| Pin 39 | RD0 — Digital I/O / AN20 / CCP4 |
| Pin 40 | RD1 — Digital I/O / AN21 / CCP5 |
| Pin 41 | RD2 — Digital I/O / AN22 / CCP6 |
| Pin 42 | RD3 — Digital I/O / AN23 / CCP7 |
| Pin 43 | RD4 — Digital I/O / AN24 / CCP8 |
| Pin 44 | RD5 — Digital I/O / AN25 / CCP9 |
| Pin 45 | RD6 — Digital I/O / AN26 / TX2 |
| Pin 46 | RD7 — Digital I/O / AN27 / RX2 |
| Pin 47 | RF0 — Digital I/O / AN16 / C1INA |
| Pin 48 | RF1 — Digital I/O / AN17 / C1INB |
| Pin 49 | RF2 — Digital I/O / AN18 / C2INA |
| Pin 50 | RF3 — Digital I/O / AN19 / C2INB |
| Pin 51 | RF4 — Digital I/O / AN20 / C1INC |
| Pin 52 | RF5 — Digital I/O / AN21 / C2INC |
| Pin 53 | RF6 — Digital I/O / AN22 / C1IND |
| Pin 54 | RF7 — Digital I/O / AN23 / C2IND |
| Pin 55 | RG0 — Digital I/O / AN24 |
| Pin 56 | RG1 — Digital I/O / AN25 / C3INA |
| Pin 57 | RG2 — Digital I/O / AN26 / C3INB |
| Pin 58 | RG3 — Digital I/O / AN27 / C3INC |
| Pin 59 | RG4 — Digital I/O / AN28 / C3IND |
| Pin 60 | MCLR — Master clear reset input (active low) |
| Pin 61 | VDD — Digital supply voltage |
| Pin 62 | VSS — Digital ground reference |
| Pin 63 | OSC1 — Crystal oscillator input / CLKI |
| Pin 64 | OSC2 — Crystal oscillator output / CLKO |
Typical Applications
PIC18F66K40-E/PTVAO is suitable for 7 applications: Consumer Appliance HMI and Control, IoT Sensor Nodes and Battery Telemetry, Automotive Body and Interior Modules, Industrial Lighting and LED Controllers, Small Motor Control (BLDC, Fans, Pumps), Industrial Sensor Transmitters and Field Instruments, Home Appliance Motor and Power Conversion.
Consumer Appliance HMI and Control
The PIC18F66K40-E/PTVAO is well matched to consumer appliance HMI and control boards where capacitive touch keypads, LED indicators, and small LCD/VFD displays must be driven reliably. Its ADC2 with Computation and Capacitive Voltage Divider (CVD) enables robust mTouch proximity and touch sensing without external analog front-ends, while the CWG and SMT peripherals generate precise PWM and timing signals for indicator dimming and buzzer control. With 64 KB Flash, manufacturers can embed multi-language UI strings, diagnostic firmware, and over-the-air update bootloaders. The 5 V tolerance simplifies interface to legacy white-goods sensors, relays, and triac drivers. XLP sleep modes keep standby power below typical 0.5 W Energy Star thresholds for always-on display appliances.
Recommended
IoT Sensor Nodes and Battery Telemetry
For battery-powered IoT sensor nodes and remote telemetry units, the PIC18F66K40-E/PTVAO delivers the right balance of low power and connectivity. XLP sleep currents below 1 uA with RAM retention enable multi-year coin-cell operation, while active current of roughly 5 mA at 64 MHz / 5 V keeps wireless transmission windows short. The integrated SMT (Signal Measurement Timer) captures pulse-width sensor data without CPU wake events, and the ADC2 Computation engine handles oversampling and averaging in hardware, freeing the core for protocol stacks. Two MSSP interfaces drive SPI sensors or I2C environmental ICs, while CLC can implement custom glue logic for wake-on-motion. This makes the part a fit for water/gas metering, smoke detectors, and asset trackers.
Recommended
Automotive Body and Interior Modules
The PIC18F66K40-E/PTVAO with Extended -40 C to +125 C temperature grade targets automotive body controllers, interior lighting, mirror modules, and seat control units. Its CAN-friendly peripheral mix (2 UART for LIN, 2 SPI for sensor hubs) and the PWM-rich timer block (4 CCP / 2 ECCP) handle LED matrix drivers and small BLDC fans without external motor controllers. The CWG peripheral generates complementary PWM with hardware dead-band for FET bridges, and the WWDT plus CRC/SCAN provide functional-safety primitives required for body-domain ASIL-B capable modules. The /VAO suffix denotes Microchip's automotive-traceable ordering code, simplifying PPAP and IMDS submissions. With 60 I/O pins, designers can consolidate multiple body-control slaves into a single MCU.
Recommended
Industrial Lighting and LED Controllers
Architectural and industrial LED controllers benefit from the PIC18F66K40-E/PTVAO's high-resolution PWM channels and CIP-driven waveform generation. Up to 6 PWM outputs (4 CCP / 2 ECCP) plus the CWG peripheral deliver hardware 16-bit phase-correct PWM for smooth dimming down to 0.1 percent, with the SMT providing accurate pulse measurement for feedback loops. The integrated 10-bit ADC2 reads ambient light and current-sense resistors for closed-loop luminous flux control, while 64 KB Flash supports DALI-2 or DMX512 protocol stacks. XLP modes enable battery-backed emergency luminaires to maintain last-state for several years. The TQFP-64 footprint also leaves room for expansion to RGBW or RGBA channels in higher-end architectural drivers.
Recommended
Small Motor Control (BLDC, Fans, Pumps)
Sensorless and sensored BLDC, fan, and small pump controllers leverage the PIC18F66K40-E/PTVAO's ECCP modules and CWG peripheral to generate complementary 3-phase PWM with programmable dead-band. The SMT captures back-EMF zero-cross events for sensorless commutation, while the ADC2 Computation engine samples phase currents with hardware oversampling to reduce torque ripple. The CRC/SCAN peripheral performs background Flash integrity checks mandated for safety-critical appliances (IEC 60730 Class B). With 60 I/O pins, designers can drive gate drivers, sense three shunt currents, and read Hall sensors simultaneously. The extended temperature grade supports under-hood automotive auxiliary pumps and outdoor HVAC blower applications.
Recommended
Industrial Sensor Transmitters and Field Instruments
Industrial 4-20 mA loop-powered and field-mount sensor transmitters benefit from the PIC18F66K40-E/PTVAO's wide 2.3 V to 5.5 V supply range, 5 V-tolerant I/O, and rich analog integration. The 10-bit ADC2 with Computation can implement ratiometric bridge sensor readings, RTD linearization, and 50/60 Hz mains rejection in hardware without CPU load. Dual comparators handle threshold detection for alarm outputs, and two UARTs support RS-485 Modbus and diagnostic service ports. The 64 KB Flash is sufficient to host IEC 61131-3 or vendor-specific calibration routines. The WWDT plus CRC/SCAN provide functional safety primitives for IEC 61508 SIL-2 capable designs, while XLP retention supports battery-backed Hart communicators.
Recommended
Home Appliance Motor and Power Conversion
Washing machines, dishwashers, induction cooktops, and small inverter compressors use the PIC18F66K40-E/PTVAO as the supervisory MCU alongside dedicated power conversion stages. Its 64 KB Flash stores wash-cycle algorithms, induction heating profiles, and user-configurable presets, while the 4 KB SRAM supports real-time UI state machines. The 5 V I/O directly interfaces to legacy triac drivers, mechanical relays, and 7-segment displays still common in mid-tier appliances. The WWDT, CRC/SCAN, and Flash live-update partition enable IEC 60730 Class B compliance for household appliance safety. Hardware CWG and SMT handle zero-cross detection and synchronous timing critical for triac firing and induction heating power factor correction.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F66K40-E/PTVAO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F66K40-E/PT | PIC18F66K22-E/PT | PIC18F65K40-I/PT | PIC18F6628-E/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-64 | TQFP-64 - same | TQFP-64 - same | TQFP-64 - same | TQFP-64 - same |
| Program Memory (Flash) | 64 KB | 64 KB | 64 KB | 32 KB | 64 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 2 KB | 3.8 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| Maximum CPU Speed | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 40 MHz / 10 MIPS |
| 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 | 2.0 V to 5.5 V |
| ADC | 10-bit ADC2 with Computation (up to 47 ch) | 10-bit ADC2 with Computation | 10-bit ADC (legacy) | 10-bit ADC2 with Computation | 10-bit ADC (legacy) |
| Core Independent Peripherals (CIP) | CWG, WWDT, CRC/SCAN, SMT, HLT, ZCD, CLC | CWG, WWDT, CRC/SCAN, SMT, HLT, ZCD, CLC | CWG, WWDT, CRC/SCAN, ECCP | CWG, WWDT, CRC/SCAN, SMT, HLT, ZCD, CLC | Standard peripherals only |
| Operating Temperature | -40 C to +125 C (Extended) | -40 C to +125 C (Extended) | -40 C to +125 C (Extended) | -40 C to +85 C (Industrial) | -40 C to +125 C (Extended) |
Key Differentiators
- Newest CIP set in PIC18F TQFP-64 family (vs PIC18F66K22-E/PT)
- Highest memory density in K40 TQFP-64 line (vs PIC18F65K40-I/PT)
- Lower power at equivalent performance (vs PIC18F6628-E/PT)
- Extended temperature grade via /VAO suffix (vs PIC18F65K40-I/PT)
Design Notes
Decouple the PIC18F66K40-E/PTVAO with a 100 nF X7R ceramic placed within 3 mm of each VDD pin, plus a shared 10 uF bulk capacitor on the AVDD/VDD rail. The AVDD and VDD pins must be tied to the same regulator; if separate analog/digital supplies are used, the difference must remain within 0.3 V. For battery applications, switch the MCU into XLP Sleep (less than 1 uA typical) between sensor events and use SMT and CLC to wake on pulse edges without software overhead.
The TQFP-64 footprint requires careful thermal relief: connect the central pad to a moderate copper pour (not a flooded plane) to avoid cold-solder joints during reflow. Place the crystal within 5 mm of OSC1/OSC2 with a grounded guard ring to reduce noise coupling, and route the ICSP PGC/PGD lines (RB6/RB7) as short as possible with parallel traces and a 4.7 kohm pull-up on MCLR. Avoid running high-current motor traces under the MCU to prevent injected logic noise.
Do not leave unused I/O pins floating on the PIC18F66K40-E/PTVAO: configure them as outputs driving low to prevent shoot-through. Watchdog Timer (WWDT) must be enabled in field-deployed firmware to recover from code lockups. The ICD pins RB6/RB7 retain their digital-I/O function in user mode, but be sure to disable the ICDTRACE bit before final firmware release to avoid unused debug chatter. When migrating from PIC18F46K40 (TQFP-44), consult the Microchip Pin Migration Guide: pins RA6/RA7, RE3/RE4/RE5, and RF0/RF1/RF2/RF3 differ in alternate-function assignments.
For long-distance sensor wiring on the PIC18F66K40-E/PTVAO, enable Schmitt trigger inputs (set INLVL = 0 in INLVLA/B/C/D/E/F/G registers) to improve noise immunity on digital inputs. The ADC2 Computation engine handles hardware oversampling and averaging; use ACC[2:0] = 111 for 64x accumulation to achieve effective 13-bit noise performance on slow DC measurements. For PWM-critical applications, the CWG peripheral provides hardware dead-band insertion with sub-100 ns resolution, eliminating software jitter in motor-drive applications.
Compliance Information
RoHS and REACH compliance confirmed on the Microchip product page. The /VAO suffix and Extended -40 C to +125 C grade indicate automotive application readiness; AEC-Q100 qualification is implied by the /VAO ordering code. Halogen-free status not explicitly stated on the verified sources - flagged as unknown per data authenticity rules.
