PIC18F26K40-I/SO - 64KB Flash 8-bit MCU, 28-SOIC | Microchip
料号： PIC18F26K40-I/SO ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.45 | $2.45 |
| 10 | $2.18 | $21.80 |
| 100 | $1.85 | $185.00 |
| 500 | $1.62 | $810.00 |
| 1,000 | $1.41 | $1,410.00 |
PIC18F26K40-I/SO 概述
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash), data memory (RAM), non-volatile EEPROM, and multiple I/O peripherals. Within the broader semiconductor taxonomy, MCUs are classified as embedded processors under microcontrollers, and the PIC18 family is Microchip's mid-range 8-bit architecture optimized for cost-effective deterministic control. The PIC18F26K40 specifically targets general-purpose applications needing large memory and rich analog/peripheral integration in a small footprint.
Key features of the PIC18F26K40 include 25-channel 10-bit ADC, multiple communication peripherals (I2C, SPI, UART with LIN), 36 I/O pins, hardware 5-bit DAC, dual comparators, and on-chip 32kHz oscillator for low-power RTC-style operation. Its XLP technology delivers nanoWatt sleep currents suitable for battery-powered edge devices, while the 64MHz core (16 MIPS) handles real-time control loops and serial protocol stacks with deterministic interrupt latency.
The device utilizes an enhanced Harvard architecture with 16-bit instruction width and an 8-bit data path, supported by Microchip's MPLAB X IDE and XC8 compiler. The 28-SOIC package provides industry-standard pin compatibility with previous PIC18 K-series devices and supports hand-soldering or reflow for prototypes and production runs.
Typical applications include industrial sensor conditioning, IoT sensor nodes, home appliances, motor control auxiliary boards, battery management secondary supervision, and low-power metering. When laying out a board with the PIC18F26K40, ensure decoupling caps are within 5mm of VDD pins, route the ICSP clock/data pair as a short guarded pair, and observe the 1.8V minimum supply during ADC reference calibration for specified linearity.
直接替换替代料： PIC18F26K40-I/SO ——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： PIC18F26K40-I/SO （相同外形与封装尺寸） ——差异在于 ADC, Package, Operating Temperature, EEPROM, Program Memory (Flash).
快速对比工具——选择替代料号进行并排对比：
PIC18F26K40-I/SS
✅ 直接替换✓ 有现货
$1.32 / 个
查看数据手册 →PIC18F26K40-E/SO
✅ 直接替换✓ 有现货
$1.52 / 个
查看数据手册 →PIC18F26K40-H/SO
✅ 直接替换📋 参考替代料（不在目录中）
PIC18F26K40T-I/SO
✅ 直接替换📋 参考替代料（不在目录中）
PIC18F46K40-I/SO
✅ 直接替换📋 参考替代料（不在目录中）
PIC18F26K42-I/SO
✅ 直接替换✓ 有现货
$1.43 / 个
查看数据手册 →PIC18F26K40-I/SO 最大额定值与电气特性
| Family | PIC18 K40 |
| Core | PIC18 (8-bit) |
| Program Memory (Flash) | 64 KB (32K x 16) |
| SRAM | 4 KB |
| EEPROM | 256 B |
| Max CPU Frequency | 64 MHz (16 MIPS) |
| Supply Voltage (VDD) | 1.8 V to 5.5 V |
| 工作温度 | -40C to +85C (Industrial, "I" grade) |
| I/O Pins | 25 (in 28-pin package) |
| ADC | 10-bit, up to 24 channels (ADC2 with computation) |
| DAC | 5-bit hardware |
| Comparators | 2 |
| PWM Channels | Multiple (CCP/ECCP/CWG-based) |
| Communication | UART/SPI/I2C with LIN support |
| Timers | Multiple 8-bit and 16-bit timers, WWDT |
| 封装 | 28-pin SOIC (SO, 7.50 mm body) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| MSL 等级 | 1 |
PIC18F26K40-I/SO 引脚配置
| 引脚 1 | RA2 — Digital I/O / analog input |
| 引脚 2 | RA3 — Digital I/O / analog input |
| 引脚 3 | RA4 — Digital I/O / analog input |
| 引脚 4 | RA5 — Digital I/O / analog input |
| 引脚 5 | VDD — Positive supply voltage (1.8V-5.5V) |
| 引脚 6 | VSS — Ground reference |
| 引脚 7 | RA0 — Digital I/O / ICSPDAT / analog input |
| 引脚 8 | RA1 — Digital I/O / ICSPCLK / analog input |
| 引脚 9 | RA7 — Digital I/O / oscillator / analog input |
| 引脚 10 | RA6 — Digital I/O / oscillator |
| 引脚 11 | RC0 — Digital I/O |
| 引脚 12 | RC1 — Digital I/O |
| 引脚 13 | RC2 — Digital I/O |
| 引脚 14 | RC3 — Digital I/O / SCL/I2C |
| 引脚 15 | RC4 — Digital I/O / SDA/I2C |
| 引脚 16 | RC5 — Digital I/O |
| 引脚 17 | RC6 — Digital I/O / TX/UART |
| 引脚 18 | RC7 — Digital I/O / RX/UART |
| 引脚 19 | VSS — Ground reference |
| 引脚 20 | VDD — Positive supply voltage |
| 引脚 21 | RB0 — Digital I/O / interrupt-on-change |
| 引脚 22 | RB1 — Digital I/O / interrupt-on-change |
| 引脚 23 | RB2 — Digital I/O / interrupt-on-change |
| 引脚 24 | RB3 — Digital I/O / interrupt-on-change |
| 引脚 25 | RB4 — Digital I/O / interrupt-on-change |
| 引脚 26 | RB5 — Digital I/O / interrupt-on-change |
| 引脚 27 | RB6 — Digital I/O / PGC (ICSP clock) |
| 引脚 28 | RB7 — Digital I/O / PGD (ICSP data) |
典型应用
PIC18F26K40-I/SO 适用于 6 应用s: Industrial Sensor Conditioning Hub, Battery-Powered IoT Sensor Node, Home Appliance Control Board, Automotive Auxiliary Module, Low-Power Metering Instrument, Embedded Sensing and Control Trainer.
Industrial Sensor Conditioning Hub
The PIC18F26K40-I/SO's 64KB Flash and 25-channel 10-bit ADC2 with computation make it ideal as a sensor hub in industrial PLC backplanes. Its 1.8V-5.5V VDD range supports both 3.3V digital sensors and legacy 5V analog transducers without level shifters. The Core Independent Peripherals (CLC, CWG, CRC/SCAN) offload sensor validation from the CPU, while the XLP nanoWatt sleep current (<100nA typical) keeps idle rack modules within thermal budgets. Pair with MCP3421 18-bit ADC for precision and DRV8871 motor driver companion IC for closed-loop control. AEC-Q100 -I grade is sufficient for non-automotive industrial enclosures.
推荐
Battery-Powered IoT Sensor Node
The PIC18F26K40-I/SO is well-suited for battery-powered IoT sensor nodes thanks to its XLP technology delivering sub-100nA sleep current, hardware RTCC for sleep scheduling, and 1.8V minimum VDD that lets a single CR2032 coin cell run down to ~2.0V usable capacity. The integrated 10-bit ADC2 with computation performs oversampling averaging in hardware, reducing firmware wake cycles by up to 70%. Use the 5-bit DAC for sensor excitation bias and UART for direct BLE bridge modules like RN4870. The 64KB Flash accommodates LoRaWAN/Matter protocol stacks with room for application firmware.
推荐
Home Appliance Control Board
The PIC18F26K40-I/SO is widely used in home appliance mainboards (washing machines, microwave ovens, coffee makers) due to its 25 I/O pins driving segment LCDs and keypad matrices, plus CWG (Complementary Waveform Generator) for inverter-class cooking or BLDC control. The 16 MIPS throughput handles AC line zero-cross detection with deterministic interrupt latency, and 64KB Flash stores multi-language UI strings and diagnostic firmware. The wide 1.8V-5.5V VDD range directly accepts rectified AC step-down to 5V without additional regulators. Pair with ULN2003A drivers for relay control.
推荐
Automotive Auxiliary Module
The PIC18F26K40-I/SO serves well in non-safety automotive auxiliaries such as body controllers, HVAC flap actuators, and lighting trim modules. Its LIN-capable UART interfaces directly to automotive body networks via MCP2003B LIN transceiver, and the 64KB Flash stores calibration tables for steering-column memory settings. The -I/ grade supports -40C to +85C cabin environments; for under-hood applications use the PIC18F26K40-H/SO AEC-Q100 variant instead. The 10-bit ADC with computation implements robust sensor diagnostics with averaging and oversampling in hardware.
推荐
Low-Power Metering Instrument
The PIC18F26K40-I/SO is ideal for electricity/water/gas metering with its 24-channel 10-bit ADC2 sampling CTs or thermistors, hardware CRC/SCAN verifying non-volatile EEPROM integrity for tamper detection, and XLP sleep currents meeting IEC 62053-21 self-consumption limits. The 256B EEPROM stores billing increments and tamper logs, while 4KB SRAM buffers interval data before UART/WiFi upload. Wide VDD 1.8V-5.5V supports 3.6V lithium battery backup with solar trickle charging. Pair with MCP3911 multi-channel energy-meter AFE for accuracy class 0.5S.
推荐
Embedded Sensing and Control Trainer
The PIC18F26K40-I/SO serves as the main MCU on Microchip Curiosity development boards used in university embedded-systems courses, due to its robust peripheral set fitting a semester curriculum. The 64KB Flash holds textbook example projects for ADC, PWM, I2C, SPI, and UART without memory pressure. 28-SOIC wide-body is friendly for hand-soldering training labs. The MPLAB X IDE with XC8 compiler is free and runs on Linux/Mac/Windows, lowering student setup friction. Pair with MikroElektronika click boards (temperature, motion, display) via mikroBUS socket for plug-and-play peripherals.
推荐
推荐产品汇总
工程参考数据： PIC18F26K40-I/SO ——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 | PIC18F26K40-E/SO | PIC18F26K40-H/SO | PIC18F26K42-I/SO | PIC18F46K40-I/SO |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (SO) | 28-SOIC (SO) - same | 28-SOIC (SO) - same | 28-SOIC (SO) - same | 28-SOIC (SO) - same |
| Flash Memory | 64 KB | 64 KB - identical | 64 KB - identical | 64 KB - identical | 256 KB - 4x larger |
| SRAM | 4 KB | 4 KB - identical | 4 KB - identical | 4 KB - identical | 8 KB - 2x larger |
| Temperature Grade | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +150C (Automotive) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| Max CPU Frequency | 64 MHz | 64 MHz - identical | 64 MHz - identical | 64 MHz - identical | 64 MHz - identical |
| Supply Voltage | 1.8V to 5.5V | 1.8V to 5.5V - identical | 1.8V to 5.5V - identical | 1.8V to 5.5V - identical | 1.8V to 5.5V - identical |
关键差异点
- Largest memory in K40 SOIC-28 family （对比 PIC18F25K40)
- Richest Core Independent Peripherals in PIC18 K40 series （对比 PIC18F26K22)
- AEC-Q100 grade available in same SOIC footprint （对比 PIC18F46K40-I/SO)
设计说明
Place a 100nF ceramic decoupling capacitor within 5mm of each VDD pin (pins 5 and 20) and a 10uF bulk capacitor near the MCU supply entry point. The PIC18F26K40-I/SO draws ~5mA at 64MHz with all peripherals active, but drops below 100nA in sleep mode. Use MCP1700 LDO for stable 3.3V from battery sources; its 1.6uA quiescent current preserves sleep budgets. Keep analog VDD (AVDD) tied to VDD with ferrite bead isolation if noisy digital rails exist nearby.
Route the ICSP programming pins RB6 (PGC) and RB7 (PGD) as a short matched pair within 25mm of the PICkit header; add 4.7kohm pull-ups if the device is not driving these lines during programming. The 28-SOIC wide-body gives 1.27mm pin pitch, allowing easy hand-soldering and rework. Keep ADC analog traces (PORTA pins) short and away from PWM or switching signals to avoid digital coupling into the 10-bit ADC measurements.
Do not exceed 5.5V on VDD or apply voltage to any pin before VDD is stable - the PIC18F26K40-I/SO has no internal clamping on I/O pins. Configure the Configuration Words (CONFIG1L through CONFIG3H) including WDT, BOR, and oscillator settings before the MCU executes the first instruction, or it may run with default FOSC=INTIO1. The ADC2 reference voltage must be configured (FVR or external VREF+) to achieve specified linearity; floating references give erratic conversions.
Estimated: At VDD=3.3V, CPU=64MHz, all peripherals active, the PIC18F26K40-I/SO draws ~10mA peak and dissipates ~33mW. Thermal resistance theta_JA for 28-SOIC is ~70 C/W, giving a junction temperature rise of 2.3C above ambient - well within the 85C industrial limit. For -40C to +125C extended temperature designs, ensure ambient never exceeds 120C with a 5C margin. No heatsink is required for normal operating conditions.
合规信息
RoHS compliant per Microchip product page. The -I/ industrial grade is not AEC-Q100 qualified; choose PIC18F26K40-H/SO for AEC-Q100 automotive. Lead-free matte-tin terminations. REACH and conflict-minerals compliant per Microchip corporate statements.
