PIC18F66K40-E/MR - 64KB Flash, 64MHz 8-bit MCU, 64-VQFN | Microchip
料号： PIC18F66K40-E/MR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.3 | $5.30 |
| 10 | $4.77 | $47.70 |
| 100 | $4.24 | $424.00 |
| 500 | $3.71 | $1,855.00 |
| 1,000 | $3.18 | $3,180.00 |
PIC18F66K40-E/MR 概述
What is a PIC18 microcontroller? A PIC18 microcontroller (MCU) is an 8-bit Harvard-architecture RISC microcontroller from Microchip Technology's PIC18 family. PIC18 MCUs sit within the broader hierarchy of microcontrollers -> embedded controllers -> semiconductor ICs, and are widely used in general-purpose embedded designs where deterministic real-time performance, low power consumption, and rich peripheral integration are required. The PIC18F66K40 family specifically targets applications needing large memory, 5V operation, and eXtreme Low Power (XLP) features.
Key features of the PIC18F66K40-E/MR include 1.024 KB of EEPROM, an integrated 10-bit ADC with computation, multiple UART/SPI/I2C interfaces, up to 54 digital I/O pins, and a wide 2.3V to 5.5V operating voltage range supporting both 3.3V and 5V systems. The device also includes a 32 MHz internal oscillator, a 16-bit PWM module, and a peripheral pin select (PPS) system for flexible signal routing. Its XLP technology delivers sub-uA sleep currents ideal for battery-powered applications.
Architecturally, the PIC18F66K40 uses a 16-bit instruction word with a hardware multiplier and a deterministic 4-clock instruction cycle, providing predictable interrupt latency. The PPS system decouples peripheral pin assignments from the silicon, simplifying PCB layout. The CIP (Core Independent Peripheral) approach enables complex control loops without CPU load, making this MCU well-suited for sensor conditioning, motor control timing, and communication bridging tasks.
Typical applications include industrial automation controllers, automotive body electronics (using the related AEC-Q100 grade), IoT sensor nodes, home appliance control boards, USB device interfaces (via MSSP modules), and battery-powered metering. The 5V tolerance and ample I/O count also suit HVAC and building automation subsystems where robustness is critical.
Designers should consider decoupling the VQFN exposed pad with a low-impedance ground plane via multiple thermal vias, and must respect the supply ramp requirements for the ADC reference. Programming is supported via Microchip's MPLAB X IDE and the XC8 compiler suite, with hardware debug enabled through the 2-wire ICSP interface.
This page synthesizes distributor pricing, same-brand drop-in alternatives, and practical design notes that complement, but are not duplicative of, the manufacturer datasheet content.
直接替换替代料： PIC18F66K40-E/MR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC18F66K40-E/MR （相同外形与封装尺寸） ——差异在于 Package, ADC, Program Memory (Flash), EEPROM, I/O Pins.
快速对比工具——选择替代料号进行并排对比：
PIC18F66K40-I/MR
✅ 直接替换✓ 有现货
$2.68 / 个
查看数据手册 →PIC18F65K40-I/PT
✅ 直接替换✓ 有现货
$1.95 / 个
查看数据手册 →PIC18F65K90-I/MR
✅ 直接替换✓ 有现货
$3.02 / 个
查看数据手册 →PIC18F65K90-E/MR
✅ 直接替换✓ 有现货
$4.6 / 个
查看数据手册 →PIC18F65K22-E/MR
✅ 直接替换✓ 有现货
$3.5 / 个
查看数据手册 →PIC18F66K40-E/MR 最大额定值与电气特性
| Core Architecture | PIC18 (8-bit RISC, enhanced) |
| Maximum CPU Frequency | 64 MHz |
| Program Memory (Flash) | 64 KB (32K x 16 words) |
| Data Memory (SRAM) | 3562 bytes |
| EEPROM | 1024 bytes |
| Operating Voltage Range | 2.3 V to 5.5 V |
| I/O Pins | 54 |
| ADC | 10-bit, with computation |
| PWM Channels | 16-bit, multiple channels |
| Communication Interfaces | UART, SPI, I2C (MSSP modules) |
| Timers | 8-bit and 16-bit timers |
| 工作温度范围 | -40C to +125C (E = Extended) |
| 封装 | 64-pin VQFN (9x9 mm) with exposed pad |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Lead Free | Yes |
PIC18F66K40-E/MR 引脚配置
| 引脚 1 | RA2 — Digital I/O / analog input AN2 |
| 引脚 2 | RA3 — Digital I/O / analog input AN3 |
| 引脚 3 | RA4 — Digital I/O / analog input AN4 |
| 引脚 4 | RA5 — Digital I/O / analog input AN5 |
| 引脚 5 | RA6 — Digital I/O |
| 引脚 6 | RA7 — Digital I/O |
| 引脚 7 | VDD — Positive supply voltage |
| 引脚 8 | VSS — Ground reference |
| 引脚 9 | RA0 — Digital I/O / analog input AN0 |
| 引脚 10 | RA1 — Digital I/O / analog input AN1 |
| 引脚 11 | RB0 — Digital I/O / interrupt-on-change |
| 引脚 12 | RB1 — Digital I/O / interrupt-on-change |
| 引脚 13 | RB2 — Digital I/O / interrupt-on-change |
| 引脚 14 | RB3 — Digital I/O / interrupt-on-change |
| 引脚 15 | RB4 — Digital I/O / interrupt-on-change |
| 引脚 16 | RB5 — Digital I/O / interrupt-on-change |
| 引脚 17 | RB6 — Digital I/O / ICD clock |
| 引脚 18 | RB7 — Digital I/O / ICD data |
| 引脚 19 | RC0 — Digital I/O / analog input AN16 |
| 引脚 20 | RC1 — Digital I/O / analog input AN17 |
| 引脚 21 | RC2 — Digital I/O / analog input AN18 |
| 引脚 22 | RC3 — Digital I/O / analog input AN19 |
| 引脚 23 | RC4 — Digital I/O |
| 引脚 24 | RC5 — Digital I/O |
| 引脚 25 | RC6 — Digital I/O / UART TX |
| 引脚 26 | RC7 — Digital I/O / UART RX |
| 引脚 27 | RE0 — Digital I/O / analog input AN20 |
| 引脚 28 | RE1 — Digital I/O / analog input AN21 |
| 引脚 29 | RE2 — Digital I/O / analog input AN22 |
| 引脚 30 | RE3 — Digital I/O / analog input AN23 |
| 引脚 31 | VDD — Positive supply voltage |
| 引脚 32 | VSS — Ground reference |
| 引脚 33 | RD0 — Digital I/O |
| 引脚 34 | RD1 — Digital I/O |
| 引脚 35 | RD2 — Digital I/O |
| 引脚 36 | RD3 — Digital I/O |
| 引脚 37 | RD4 — Digital I/O |
| 引脚 38 | RD5 — Digital I/O |
| 引脚 39 | RD6 — Digital I/O |
| 引脚 40 | RD7 — Digital I/O |
| 引脚 41 | RF0 — Digital I/O / analog input AN24 |
| 引脚 42 | RF1 — Digital I/O / analog input AN25 |
| 引脚 43 | RF2 — Digital I/O / analog input AN26 |
| 引脚 44 | RF3 — Digital I/O / analog input AN27 |
| 引脚 45 | RF4 — Digital I/O / analog input AN28 |
| 引脚 46 | RF5 — Digital I/O / analog input AN29 |
| 引脚 47 | RF6 — Digital I/O |
| 引脚 48 | RF7 — Digital I/O |
| 引脚 49 | RG0 — Digital I/O |
| 引脚 50 | RG1 — Digital I/O |
| 引脚 51 | RG2 — Digital I/O |
| 引脚 52 | RG3 — Digital I/O |
| 引脚 53 | RG4 — Digital I/O |
| 引脚 54 | RG5 — Digital I/O |
| 引脚 55 | RG6 — Digital I/O |
| 引脚 56 | RG7 — Digital I/O |
| 引脚 57 | RH0 — Digital I/O / analog input AN30 |
| 引脚 58 | RH1 — Digital I/O / analog input AN31 |
| 引脚 59 | RH2 — Digital I/O |
| 引脚 60 | RH3 — Digital I/O |
| 引脚 61 | OSC1 — Crystal oscillator input |
| 引脚 62 | OSC2 — Crystal oscillator output |
| 引脚 63 | MCLR — Master clear / reset input |
| 引脚 64 | AVSS — Analog ground |
典型应用
PIC18F66K40-E/MR 适用于 6 应用s: Industrial Automation Controller, Automotive Body Electronics, IoT Sensor Node, Home Appliance Control Board, USB Device Interface Hub, Battery-Powered Metering.
Industrial Automation Controller
The PIC18F66K40-E/MR suits industrial automation controllers thanks to its 64 MHz PIC18 core, 64 KB Flash for ladder-logic or state-machine firmware, and 3562 bytes SRAM for protocol buffering. Its 5V tolerance simplifies interfacing with legacy 24V-sensor signal conditioning front-ends, while Core Independent Peripherals (CLC, CWG) handle deterministic timing for PWM-driven actuators without CPU load. The extended -40C to +125C operating range supports factory floor deployments, and the 64-pin VQFN 9x9 mm package integrates cleanly into PLC daughter-card layouts with adequate ground-plane cooling.
推荐
Automotive Body Electronics
The PIC18F66K40-E/MR is deployed in automotive body controllers where its extended -40C to +125C operating temperature, 5V rail tolerance, and 54 I/O pins drive multiple load switches. Its 10-bit ADC with computation handles resistive sensor inputs (temperature, position) directly, while the 16-bit PWM module dims lighting with fine resolution. The CIP architecture lets PWM and ADC handshake in hardware for closed-loop LED brightness control without CPU intervention, and 1024 bytes of EEPROM stores calibration data across ECU lifetime.
推荐
IoT Sensor Node
Battery-powered IoT sensor nodes benefit from the PIC18F66K40-E/MR's XLP (eXtreme Low Power) technology, with sleep currents below 1 uA when peripherals are gated off. The 64 KB Flash accommodates OTA-update bootloaders alongside application code, and the 16-bit RTCC tracks time-stamps during deep-sleep intervals. CIP peripherals wake the CPU only on predefined sensor events (CLC), minimizing average current to single-digit uA. The wide 2.3V to 5.5V VDD range supports direct Li-coin-cell and 3.6V LiSOCl2 battery chemistries without boost regulators.
推荐
Home Appliance Control Board
Washing machines, dishwashers, and induction cooktops leverage the PIC18F66K40-E/MR's combination of 64 KB Flash for UI state machines, 16-bit PWM for motor and heating-element control, and 5V-tolerant I/O for triac interfacing. The CWG peripheral generates complementary PWM signals with programmable dead-time, ideal for synchronous-rectifier motor drives, while the WWDT provides a windowed watchdog that catches both stuck and runaway firmware - critical for safety-certified appliances. The 64-pin VQFN package fits compact appliance PCB footprints.
推荐
USB Device Interface Hub
For USB device peripherals such as HID controllers, data loggers, and instrumentation front-ends, the PIC18F66K40-E/MR provides ample Flash (64 KB) and SRAM (3562 bytes) to host USB stacks alongside application logic. The MSSP modules deliver SPI/I2C for sensor bridging, while the 10-bit ADC samples analog inputs at up to 100 ksps. The exposed-pad VQFN enables thermal dissipation at moderate CPU loads (50% duty at 64 MHz), and PPS routes USB, UART, and timers to optimal PCB positions without silicon revisions.
推荐
Battery-Powered Metering
Smart electricity, water, and gas meters use the PIC18F66K40-E/MR for its XLP sleep modes (sub-uA), 16-bit RTCC with calendar function for time-stamped consumption records, and 1024 bytes EEPROM for non-volatile log retention across battery swaps. The 10-bit ADC with computation performs RMS current and voltage measurements with hardware oversampling, offloading the CPU. The extended -40C to +125C temperature range ensures metering accuracy in outdoor enclosures, and the 5V tolerance simplifies integration with hall-effect current sensors.
推荐
推荐产品汇总
工程参考数据： PIC18F66K40-E/MR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PIC18F66K40-I/MR | PIC18F65K40-I/PT | PIC18F65K90-I/MR | PIC18F65K90-E/MR | PIC18F65K22-E/MR |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | VQFN-64 (9x9 mm) | VQFN-64 (9x9 mm) - same | TQFP-64 (10x10 mm) - different mechanical | VQFN-64 (9x9 mm) - same | VQFN-64 (9x9 mm) - same | VQFN-64 (9x9 mm) - same |
| Flash Memory | 64 KB | 64 KB - same | 32 KB (-50%) | 32 KB (-50%) | 32 KB (-50%) | 32 KB (-50%) |
| SRAM | 3562 bytes | 3562 bytes - same | 2048 bytes (-43%) | 2048 bytes (-43%) | 2048 bytes (-43%) | 1536 bytes (-57%) |
| Operating Temperature | -40C to +125C (E) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +125C (E) | -40C to +125C (E) |
| CIP Peripherals (CLC/CWG/WWDT) | Yes | Yes - same | Yes - same | No (older K90 peripheral set) | No (older K90 peripheral set) | No (older K22 peripheral set) |
| Maximum CPU Frequency | 64 MHz | 64 MHz - same | 64 MHz - same | 64 MHz - same | 64 MHz - same | 64 MHz - same |
| I/O Pins | 54 | 54 - same | 54 - same | 54 - same | 54 - same | 54 - same |
| Approx. 100-piece Price (USD, as of 2026-09-28) | $4.24 | $3.95 (lower-grade pricing) | $3.80 (TQFP, lower memory) | $3.85 | $4.10 | $3.95 |
关键差异点
- Largest Flash in the K40 VQFN-64 family （对比 PIC18F65K40-I/PT)
- Extended operating temperature for harsh environments （对比 PIC18F66K40-I/MR)
- Newer Core Independent Peripheral (CIP) integration （对比 PIC18F65K90-I/MR)
设计说明
The 64-pin VQFN 9x9 mm package relies on the exposed thermal pad for heat dissipation. At maximum CPU frequency (64 MHz) and full peripheral activity, internal junction temperature can rise 15-20C above ambient without proper PCB layout. Always connect the exposed pad to a solid ground plane using at least 9 thermal vias (0.3 mm drill, 0.5 mm pad) in a 3x3 grid to maintain thermal resistance theta_JA within datasheet limits. For continuous high-load applications, consider the TQFP-64 variant (PIC18F65K40-I/PT) which has better thermal dissipation through peripheral leads.
Place the 100 nF VDD decoupling capacitor as close as possible to pins 7 and 31, with a 10 uF bulk capacitor nearby on each VDD rail. The AVSS pin (64) must connect to a clean analog ground, ideally separated from digital ground at a single-point star near the MCU. Avoid routing high-speed digital signals under the exposed pad to minimize coupling. Keep crystal traces (OSC1/OSC2 at pins 61/62) short and symmetric, with a ground guard ring, to maintain oscillator stability across the 2.3V to 5.5V supply range.
When migrating firmware from the PIC18F65K90 family, note that the K40 generation introduced the PPS (Peripheral Pin Select) system, which changes the default pin assignments for UART, SPI, I2C, and timers compared to older PIC18 devices. Existing K90 firmware requires reconfiguration of PPS registers or pin remapping. Also note the Configuration Word changes for the K40 CIP enable bits; the CLC, CWG, and WWDT modules must be explicitly unlocked via the CLCSELECT, CWGCON, and WDTCON registers before use. Source: Microchip PIC18 K40 migration guide.
The PPS system allows digital peripherals to be routed to most I/O pins, simplifying PCB layout but requiring careful attention to pin function conflicts. Avoid assigning the same physical pin to multiple peripheral outputs simultaneously. For 5V-tolerant I/O applications, ensure the input voltage on any digital pin does not exceed VDD + 0.3V; if interfacing with 5V logic while the MCU runs at 3.3V, use level translators such as the TXS0108E. The MCLR pin (63) must have a 10 kohm pull-up to VDD and a 100 nF capacitor to ground for proper reset behavior during power-up.
合规信息
RoHS and REACH compliant per Microchip product page. The -E/MR grade is industrial-extended temperature but NOT AEC-Q100 qualified; for automotive designs requiring AEC-Q100, refer to the PIC18F66K40 automotive grade variants from Microchip. Lead-free and halogen-free assembly compatible.
