PIC18F27K40T-I/SS - 128KB Flash 8-bit MCU, 28-SSOP | Microchip
料号： PIC18F27K40T-I/SS ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.9 | $29.00 |
| 100 | $2.45 | $245.00 |
| 500 | $2.15 | $1,075.00 |
| 1,000 | $1.95 | $1,950.00 |
PIC18F27K40T-I/SS 概述
What is a PIC18 microcontroller? PIC18 is Microchip's high-end 8-bit microcontroller family, using a RISC architecture with C-compiler-friendly instruction set, large memory options, and rich Core Independent Peripherals (CIPs). The PIC18F27K40 belongs to the K40 sub-family, which adds eXtreme Low-Power (XLP) technology for battery-powered designs, support for 2.5V to 5.5V operation, and integrated analog peripherals such as a 10-bit ADC with Computation (ADC2), a 5-bit DAC, comparators, and zero-cross detect. Within the broader taxonomy, PIC18 belongs to microcontrollers -> 8-bit MCU -> embedded controller -> semiconductor IC.
Key features include 24 channels of 10-bit ADC2, a 5-bit DAC, two comparators with selectable references, CWG (Complementary Waveform Generator), multiple PWM and CCP modules, hardware CRC/Memory Scan, a Windowed Watchdog Timer (WWDT), Peripheral Pin Select (PPS), and 35 I/O pins. The XLP technology provides nanoWatt sleep currents suitable for battery and energy-harvesting designs, while 5V tolerance simplifies industrial interface requirements.
The PIC18F27K40 implements a Harvard architecture with separate program and data buses, a modified RISC instruction set (83 base instructions, single-cycle except branches), and self-programmable Flash with block-level write protection. Core Independent Peripherals such as CWG, WWDT, and ADC2 with hardware averaging execute without CPU intervention, freeing the core for application logic and reducing firmware complexity.
Typical applications include industrial sensor interfaces, low-power IoT edge nodes, home appliance controllers, automotive body electronics, USB-CDC human-interface devices (with on-chip MSSP/CAN peripherals depending on family), and general-purpose 5V embedded systems. The XLP features make the part attractive for battery-powered metering and remote-control designs.
When designing with this device, ensure that the ICSP/PGD/PGC programming pins are accessible on the PCB for in-system programming and debugging. The wide 2.5V-5.5V supply range allows direct operation from a single Li-ion cell or a regulated 5V rail; however, the maximum ADC sampling rate is limited at lower Vdd values. PPS provides flexible peripheral-to-pin mapping but must be locked after configuration to prevent accidental re-mapping during runtime.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that complement - and in places go beyond - the manufacturer datasheet, helping engineers select, source, and integrate the PIC18F27K40T-I/SS more efficiently.
直接替换替代料： PIC18F27K40T-I/SS ——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： PIC18F27K40T-I/SS （相同外形与封装尺寸） ——差异在于 ADC, Comparators, Package, Communication, DAC.
快速对比工具——选择替代料号进行并排对比：
PIC18F27K40-I/SS
✅ 直接替换✓ 有现货
$1.99 / 个
查看数据手册 →PIC18F26K40T-I/SS
✅ 直接替换✓ 有现货
$1.94 / 个
查看数据手册 →PIC18F25K40T-I/SS
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1.45 / 个
查看数据手册 →PIC18F26K42T-I/SS
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.3 / 个
查看数据手册 →PIC18F27K42T-I/SS
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
PIC18F27K40T-I/SS 最大额定值与电气特性
| Device Family | PIC18F K40 (PIC18F27K40) |
| Core | 8-bit PIC RISC |
| Program Memory (Flash) | 128 KB (64K x 16) |
| Data Memory (RAM) | 4 KB |
| EEPROM | 256 bytes |
| Maximum CPU Frequency | 64 MHz |
| Supply Voltage (Vdd) | 2.5 V to 5.5 V |
| 工作温度 | -40 C to +85 C (Industrial) |
| 封装 | 28-SSOP (5.30 mm body, 1.78 mm height) |
| I/O Pins | 25 (general-purpose) |
| ADC | 10-bit ADC2, up to 24 channels |
| DAC | 5-bit DAC, 1 channel |
| Comparators | 2 with selectable references |
| PWM Modules | Yes (multiple CCP/ECCP) |
| Communication | UART, SPI (MSSP), I2C |
| Special Peripherals | CWG, WWDT, CRC/Memory Scan, Zero-Cross Detect, PPS |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
PIC18F27K40T-I/SS 引脚配置
| 引脚 1 | RA2/AN4 — GPIO/Analog input channel 4 |
| 引脚 2 | RA3/AN5/VREF+ — GPIO/Analog input/Vref+ |
| 引脚 3 | RA4/AN6 — GPIO/Analog input channel 6 |
| 引脚 4 | RA5/AN7/SS2 — GPIO/Analog input/SPI2 slave select |
| 引脚 5 | Vss — Ground |
| 引脚 6 | RA7 — GPIO |
| 引脚 7 | RA6/OSC2/CLKOUT — GPIO/Crystal output/Clock out |
| 引脚 8 | RA1/AN3/C1INC — GPIO/Analog input/Comparator 1 inverting input |
| 引脚 9 | RA0/AN0/C1INA — GPIO/Analog input/Comparator 1 non-inverting input |
| 引脚 10 | RA1 — GPIO (shared function) |
| 引脚 11 | Vdd — Positive supply voltage (2.5V-5.5V) |
| 引脚 12 | Vss — Ground |
| 引脚 13 | RA2 — GPIO (shared function) |
| 引脚 14 | RC0/SOSCO — GPIO/SOSC oscillator output |
| 引脚 15 | RC1/SOSCI — GPIO/SOSC oscillator input |
| 引脚 16 | RC2/AN8 — GPIO/Analog input channel 8 |
| 引脚 17 | RC3/AN9/SCL1 — GPIO/Analog input/I2C1 clock |
| 引脚 18 | RC4/AN10/SDA1 — GPIO/Analog input/I2C1 data |
| 引脚 19 | RC5/AN11 — GPIO/Analog input channel 11 |
| 引脚 20 | RC6/AN12/TX1 — GPIO/Analog input/UART1 TX |
| 引脚 21 | RC7/AN13/RX1 — GPIO/Analog input/UART1 RX |
| 引脚 22 | RB0/AN12/ZCD — GPIO/Analog input/Zero-cross detect |
| 引脚 23 | RB1/AN8/C1INB — GPIO/Analog input/Comparator 1 input B |
| 引脚 24 | RB2/AN9 — GPIO/Analog input channel 9 |
| 引脚 25 | RB3/AN10 — GPIO/Analog input channel 10 |
| 引脚 26 | RB4/AN11 — GPIO/Analog input channel 11 |
| 引脚 27 | RB5/AN13 — GPIO/Analog input channel 13 |
| 引脚 28 | RB6/ICSPCLK — GPIO/ICSP programming clock |
典型应用
PIC18F27K40T-I/SS 适用于 6 应用s: Industrial Sensor Interface Module, Battery-Powered IoT Edge Node, Home Appliance Control Board, Automotive Body Electronics, USB Human Interface Device (HID) Dongle, Low-Power Smart Metering.
Industrial Sensor Interface Module
The PIC18F27K40T-I/SS is well-suited for industrial sensor interface modules because its 24-channel 10-bit ADC2 with computation provides simultaneous sensor sampling, while the CWG (Complementary Waveform Generator) drives half-bridge sensor excitation signals. Its 2.5V-5.5V supply range accepts 24V industrial rails after regulation, and the XLP nanoWatt sleep modes extend battery life in remote wireless transmitters. The 25 GPIO with Peripheral Pin Select enables flexible PCB routing of SPI/I2C buses to multiple sensor clusters on the same board.
推荐
Battery-Powered IoT Edge Node
The PIC18F27K40T-I/SS targets battery-powered IoT edge nodes thanks to its XLP technology with deep-sleep currents below 1 uA and RAM retention down to 1.8V. The 128 KB Flash fits BLE/Zigbee host stacks or LoRaWAN application layers, while 64 MHz operation gives 16 MIPS for sensor-fusion processing. Compared to STM32L0, it offers simpler interrupt and PPS-driven peripheral mapping that reduces firmware complexity in cost-sensitive connected devices.
推荐
Home Appliance Control Board
The PIC18F27K40T-I/SS powers home appliance main control boards because its 5V tolerance interfaces directly with triac drivers, mechanical relays, and legacy 5V sensors common in white goods. Hardware zero-cross detect synchronizes AC load switching to reduce EMI, and the on-chip comparators implement over-current and over-temperature protection without external circuitry. The 28-SSOP footprint and 64 MHz core keep the BOM small while supporting graphical UI routines on segment LCDs.
推荐
Automotive Body Electronics
The PIC18F27K40T-I/SS serves automotive body modules - lighting controllers, seat controllers, climate trim - that need 5V tolerance and robust ESD performance. Its industrial temperature grade (-40C to +85C) covers cabin environments, while 64 MIPS and 24 ADC channels handle multiple LIN sub-nodes and LED matrix drivers simultaneously. For under-hood AEC-Q100 requirements, designers should consider the PIC18F2xK40-Q1 variant instead.
推荐
USB Human Interface Device (HID) Dongle
The PIC18F27K40T-I/SS implements USB HID class dongles (keyboards, mice, custom input devices) when paired with an external USB-UART bridge like MCP2200 or MCP2221. The MSSP module provides I2C/SPI for sensor reads, and the 5V tolerant GPIO interfaces with legacy mechanical switches and capacitive touch pads. Its 4 KB RAM accommodates HID report buffers and small protocol stacks without needing a 32-bit MCU.
推荐
Low-Power Smart Metering
The PIC18F27K40T-I/SS is well matched to low-power smart metering because its XLP sleep currents extend battery life across multi-year deployments, while the 10-bit ADC2 with hardware accumulation averages current/voltage sensor inputs without CPU wakeup. The CRC/Memory Scan peripheral detects Flash corruption in unattended metering nodes, and the WWDT provides independent safety monitoring. Wide 2.5V-5.5V Vdd allows direct operation from lithium-thionyl chloride cells used in utility metering.
推荐
推荐产品汇总
工程参考数据： PIC18F27K40T-I/SS ——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 | PIC18F27K40-I/SS | PIC18F26K40T-I/SS | PIC18F25K40T-I/SS | PIC18F26K42T-I/SS | PIC18F27K42T-I/SS |
|---|---|---|---|---|---|---|
| Package | 28-SSOP | 28-SSOP | 28-SSOP | 28-SSOP | 28-SSOP | 28-SSOP |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 128 KB | 128 KB | 64 KB | 32 KB | 64 KB | 128 KB |
| RAM | 4 KB | 4 KB | 2 KB | 2 KB | 2 KB | 4 KB |
| Maximum CPU Frequency | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| Supply Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
| Generation | K40 | K40 | K40 | K40 | K42 | K42 |
关键差异点
- Larger Flash memory within the K40 family （对比 PIC18F26K40T-I/SS)
- K40 generation Core Independent Peripherals (CIPs) （对比 PIC18F26K20T-I/SO)
- 5V tolerance across all GPIO （对比 PIC18F25K22-I/SO)
设计说明
The PIC18F27K40T-I/SS supports XLP nanoWatt sleep modes with currents below 1 uA in deep sleep with RAM retention. Use the Idle and Sleep modes (DOZE, IDLEN, SLEEP bits in CPUDOZE/STATUS) to maximize battery life. Estimated: at 3.0V Vdd and 32 kHz SOSC operation, the typical sleep current is approximately 900 nA. Wake-up latency is typically 4 instruction cycles from sleep.
Route ICSPDAT (RB7) and ICSPCLK (RB6) to a programming header with no series resistors or buffer circuits between the device and the programmer. Place a 100 nF decoupling capacitor on Vdd (pin 11) within 5 mm of the pin, and bulk 4.7 uF + 100 nF on the supply input. Keep the MCLR pin pulled-up with 10 kohm to Vdd through a diode-capacitor RC reset network to support in-system programming while still allowing manual reset.
The Peripheral Pin Select (PPS) module must be unlocked before peripheral pin remapping, and then locked again to prevent accidental re-mapping during runtime. Do not lock PPS via the IOLOCK bit in CRYPTO unless your initialization code is fully validated. Estimated: forgetting to lock PPS is a common production bug that can cause field failures after unexpected interrupt-driven firmware paths. Always include a configuration bit check in the bootloader to verify PPS lock state.
When using the ADC2 module, place the analog reference bypass capacitor on VREF+/VREF- pins as close as physically possible, with a star ground connection. Use a separate analog ground island for AGND and digital ground to avoid ground-loop noise coupling into ADC results. Estimated: at 64 MHz CPU clock, digital switching noise can degrade ADC SNR by up to 6 dB if ground returns are shared; a split ground plan with single-point join at the MCU improves ADC performance by approximately 3-4 LSB.
合规信息
RoHS compliant per Microchip product page. Industrial temperature grade (-40C to +85C); AEC-Q100 automotive versions are available as PIC18F2xK40-Q1 in separate order codes.
