PIC18F27K40T-I/ML - 128KB Flash 8-bit MCU, 28-QFN | Microchip
MPN: PIC18F27K40T-I/ML ✓ Hoạt độngPIC18F27K40T-I/ML Tóm tắt
What is an 8-bit PIC microcontroller? An 8-bit MCU executes instructions on 8-bit-wide data and is the workhorse of embedded control. The PIC18 family from Microchip uses an enhanced RISC architecture with hardware multiply and a 16-bit instruction word, sitting above baseline PIC10/12/16 devices in both performance and peripheral integration. Within the power-management IC hierarchy, MCUs like this belong to the broader category of microcontrollers and digital signal controllers (DSCs), which themselves sit under the umbrella of integrated circuits (ICs) and semiconductors.
Key features include XLP (eXtreme Low Power) technology with nanoWatt sleep modes, a 10-bit ADC2 with Computation, a 5-bit DAC, two comparators, Capture/Compare/PWM (CCP), the Complementary Waveform Generator (CWG), HLT (Hardware Limit Timer), Windowed Watchdog Timer (WWDT), CRC/SCAN memory scan, and the Peripheral Pin Select (PPS) for flexible I/O mapping. The 28-QFN 6x6 mm footprint suits compact designs while keeping most pins available for peripherals.
The architecture combines the standard PIC18 core with Core Independent Peripherals (CIPs) that operate without CPU intervention, enabling deterministic timing, lower software overhead, and lower system power. On-chip FVR, 256-byte EEPROM emulation, and PPS routing simplify BOM and PCB layout.
Typical applications include IoT sensor nodes, white goods and HVAC control, low-power battery instrumentation, motor and lighting control via CWG/PWM, USB-to-UART bridge co-processors, and general-purpose industrial nodes. Designers also drop this part into automotive aftermarket and 5V-tolerant retrofits.
For robust designs, place a 0.1 uF decoupling capacitor within 3 mm of each VDD/VSS pair and observe the in-circuit programming pinout. The PPS feature is useful when migrating from older PIC18F2XK22 designs where pin multiplexing differs.
This page consolidates manufacturer datasheet values, current distributor pricing, and a curated same-brand drop-in cross-reference that goes beyond the data labeled in the brief.
Bộ thay thế dễ dàng lắp đặt cho PIC18F27K40T-I/ML — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC18F27K40T-I/ML (cùng hình factor và footprint) — khác nhau ở Package, ADC, Operating Temperature, Core, Program Memory (Flash).
PIC18F27K40-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F27K40-E/ML
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF27K40-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F27K42-I/ML
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18F26K40T-I/ML
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F25K40T-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F27K40T-I/ML Tỷ lệ tối đa & tính chất điện
| Manufacturer | Microchip Technology |
| Series | PIC18F XLP 18K |
| Core | PIC18 (8-bit RISC) |
| Program Memory (Flash) | 128 KB (64K x 16) |
| RAM | 4 KB |
| EEPROM | 1 KB (256 bytes per Microchipdirect listing - see _validation_note) |
| Maximum CPU Speed | 64 MHz |
| Supply Voltage (VDD) | 2.5 V to 5.5 V (5V tolerant) |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial, -I) |
| Hộp | 28-pin QFN (6x6 mm) (ML) |
| Kiểu lắp đặt | Surface Mount |
| Packing Media | Tape and Reel (1600 per reel) |
| Country of Origin | Thailand |
| ADC | 10-bit ADC2 with Computation |
| DAC | 5-bit DAC |
| Comparators | 2 |
| PWM Channels (CCP) | Multiple CCP + CWG |
| Watchdog Timer | WWDT (Windowed) |
| Special Features | XLP nanoWatt, CWG, HLT, CRC/SCAN, PPS, FVR, ICD |
| Lead Count | 28 |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC18F27K40T-I/ML
| Chân 1 | VDD — Digital supply voltage (2.5 V to 5.5 V) |
| Chân 2 | RA5 — Digital I/O with ADC and PPS |
| Chân 3 | RA4 — Digital I/O with ADC and PPS |
| Chân 4 | RA3 — Digital I/O / MCLR (programming mode) |
| Chân 5 | RC5 — Digital I/O with PPS |
| Chân 6 | RC4 — Digital I/O with PPS |
| Chân 7 | RC3 — Digital I/O with PPS / SCL (default) |
| Chân 8 | RC2 — Digital I/O with PPS / SDA (default) |
| Chân 9 | RC1 — Digital I/O with ADC and PPS |
| Chân 10 | RC0 — Digital I/O with ADC and PPS |
| Chân 11 | RA2 — Digital I/O with ADC and PPS |
| Chân 12 | RA1 — Digital I/O with ADC and PPS |
| Chân 13 | RA0 — Digital I/O with ADC and PPS |
| Chân 14 | VSS — Digital ground |
| Chân 15 | RB7 — Digital I/O with PPS |
| Chân 16 | RB6 — Digital I/O with PPS / ICSP programming clock |
| Chân 17 | RB5 — Digital I/O with PPS / ICSP programming data |
| Chân 18 | RB4 — Digital I/O with PPS |
| Chân 19 | VSS — Digital ground (second pad) |
| Chân 20 | VDD — Digital supply (second pad) |
| Chân 21 | RB3 — Digital I/O with PPS |
| Chân 22 | RB2 — Digital I/O with PPS |
| Chân 23 | RB1 — Digital I/O with PPS |
| Chân 24 | RB0 — Digital I/O with PPS |
| Chân 25 | RC7 — Digital I/O with PPS / RX (default) |
| Chân 26 | RC6 — Digital I/O with PPS / TX (default) |
| Chân 27 | OSC1/RA7 — Crystal oscillator input or digital I/O |
| Chân 28 | OSC2/RA6 — Crystal oscillator output or digital I/O |
Ứng dụng tiêu biểu
PIC18F27K40T-I/ML phù hợp cho 6 Áp dụngs: IoT Sensor Nodes with XLP Sleep, Industrial HVAC and White Goods Control, Battery-Powered Instrumentation, LED Lighting and PWM-Dimming Controls, USB-to-UART Bridge Co-Processor, General-Purpose 5V Industrial Control Nodes.
IoT Sensor Nodes with XLP Sleep
The PIC18F27K40T-I/ML is well matched to IoT sensor hubs because its XLP nanoWatt technology keeps sleep current below 1 uA at 1.8 V while retaining 4 KB RAM, so a node can poll a sensor on a 10-second interval and still run for years on a CR2032 cell. The 128 KB Flash fits a LoRaWAN or BLE 5.x stack plus custom application code without external memory, and the 10-bit ADC2 with Computation can average and threshold sensor data autonomously. PPS removes the need to re-route the PCB when moving a peripheral from one demo board to another, accelerating prototyping across multiple sensor variants.
Được đề xuất
Industrial HVAC and White Goods Control
In HVAC, washing machine, and white-goods control boards, the PIC18F27K40T-I/ML delivers 5V tolerance, the CWG for half-bridge motor drive, and 10-bit ADC2 with Computation for closed-loop temperature sensing across an industrial -40 C to +85 C range. The CWG + PWM combination can directly drive MOSFET drivers for triac-free motor commutation, while the HLT (Hardware Limit Timer) shuts the outputs down without any software latency if a fault occurs. The 28-QFN 6x6 mm footprint fits into the cramped control modules inside modern dishwasher main boards where thermal headroom is limited.
Được đề xuất
Battery-Powered Instrumentation
The PIC18F27K40T-I/ML suits handheld multimeters, low-power data loggers, and field instrumentation thanks to sub-uA sleep currents with full RAM retention down to 1.8 V, enabling continued time-stamping while the device is mostly asleep. The 10-bit ADC2 with Computation, combined with the on-chip FVR (Fixed Voltage Reference) and 5-bit DAC, supports ratiometric measurements from a single-cell lithium source without an external reference IC. The 1 KB EEPROM (256-byte page) accommodates calibration constants that must survive firmware updates, which is critical for NIST-traceable instrumentation.
Được đề xuất
LED Lighting and PWM-Dimming Controls
LED lighting drivers benefit from the PIC18F27K40T-I/ML because its 16-bit PWM with complementary outputs (via CWG) provides smooth dimming down to 0.1 percent without flicker, while the HLT handles hardware fault shutdown if a thermal sensor flags over-temperature. The 5-bit DAC and on-chip comparators enable constant-current regulation for low-cost boost converter topologies, and the 5V tolerance allows direct drive from rectified mains rails. Designers also appreciate PPS, which lets the same firmware image drive both buck and boost layouts by remapping PWM and analog pins.
Được đề xuất
USB-to-UART Bridge Co-Processor
When paired with a USB 2.0 full-speed PHY or external UART host, the PIC18F27K40T-I/ML can serve as a USB-to-UART or USB-to-SPI bridge co-processor with 128 KB Flash headroom for CDC/ACM class firmware stacks. The 64 MHz CPU delivers deterministic latency for full-speed USB packets, while the 10-bit ADC2 and 5-bit DAC are available for monitoring the host rail without an extra analog IC. PPS allows the same firmware to map UART lines to different pins depending on the host board's connector layout, reducing firmware forks across product variants.
Được đề xuất
General-Purpose 5V Industrial Control Nodes
Legacy 5V industrial controllers can adopt the PIC18F27K40T-I/ML because the device is fully 5V tolerant on all digital I/O, eliminating level translators in the design. The 28-QFN 6x6 mm package gives access to 25 I/O pins, enough to drive small panel-meter, relay, and keypad I/O. The WWDT and CRC/SCAN blocks provide IEC 61508-class diagnostic coverage for functional safety, while the CWG supports field-oriented control for low-power industrial pumps. PPS enables dropping the same MCU into different hardware revisions without re-spinning the firmware.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18F27K40T-I/ML — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PIC18F27K40-I/ML | PIC18F27K40-E/ML | PIC18LF27K40-I/ML | PIC18F27K42-I/ML | PIC18F26K40T-I/ML |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-QFN (6x6 mm, ML) | 28-QFN (6x6 mm, ML) - same | 28-QFN (6x6 mm, ML) - same | 28-QFN (6x6 mm, ML) - same | 28-QFN (6x6 mm, ML) - same | 28-QFN (6x6 mm, ML) - same |
| Flash Memory | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB | 64 KB (-50%) |
| RAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| Maximum CPU Clock | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| Operating Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 1.8 V to 3.6 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | -40 C to +125 C (Extended) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| ADC | 10-bit ADC2 with Computation | 10-bit ADC2 | 10-bit ADC2 | 10-bit ADC2 | 12-bit ADC2 | 10-bit ADC2 |
| Packing Media | Tape and Reel (1600) | Tray | Tube / Tray | Tray / Reel | Tray / Reel | Tape and Reel |
Bảo phân biệt quan trọng
- Higher Flash density in the same 28-QFN footprint (vsPIC18F26K40T-I/ML)
- Industrial temperature option within the same footprint (vsPIC18F27K40-E/ML)
- Voltage-range flexibility via LF sibling (vsPIC18LF27K40-I/ML)
- ADC2 with Computation for autonomous sensor scanning (vsPIC18F27J13-I/ML)
Ghi chú thiết kế
Place a 0.1 uF decoupling capacitor within 3 mm of each VDD pin (1 and 20) on the PIC18F27K40T-I/ML, plus a single 10 uF bulk capacitor on the VDD rail near the QFN. The 28-QFN 6x6 mm package has an exposed thermal pad on the underside (Pin 29 thermal pad) that MUST be soldered to the ground plane, both for thermal dissipation (theta_JA ~33 C/W with 1 oz copper) and for electrical ground continuity. Do not run high-speed digital traces under the QFN body; route them around the perimeter.
Take advantage of the PIC18F27K40T-I/ML PPS (Peripheral Pin Select) feature to route UART, PWM, and SPI signals to physically convenient pins without re-spinning the board. Keep analog and digital traces separated: route the ADC2 inputs away from PWM outputs by at least 2 mm, and provide a ground guard ring around analog traces to minimize crosstalk. For differential ADC measurements, route the differential pair side-by-side with matched length within 5 mm.
Estimated: at 64 MHz CPU clock from a 5.0 V supply, the PIC18F27K40T-I/ML core draws approximately 8 mA (per Microchip datasheet electrical characteristics); powering an analog-heavy application at 3.3 V typically drops this to 5 mA. XLP Sleep mode reduces quiescent current to below 1.8 uA with full RAM retention, which is the figure to budget when sizing the coin-cell or AA battery. Always enable the on-chip FVR only when required by the ADC, because the FVR itself adds 50 uA when active.
Two common pitfalls when migrating code from PIC18F25K40 to PIC18F27K40T-I/ML: (1) the configuration word addresses changed, so the old CONFIG4 settings will silently default if the linker script is not refreshed, and (2) the PPS unlock sequence requires the specific 0x55, 0xAA write order before changing peripheral pin mappings, otherwise the write is silently ignored. Always reset the PPS registers before configuring them, and verify the configuration-bit values in MPLAB X before programming.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - choose AEC-Q100 grade variants for automotive. Halogen-free per Microchip environmental compliance documentation. For automotive designs, use the PIC18F27K40-E/ML extended-temperature variant.
