PIC18F25K20T-I/SO - 8-bit 64MHz 32KB Flash MCU | Microchip
MPN： PIC18F25K20T-I/SO ✓ 啟用中PIC18F25K20T-I/SO 概覽
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash), working RAM, peripherals and I/O into one IC, enabling standalone embedded control. The PIC18F25K20 specifically belongs to the PIC18 advanced 8-bit family with enhanced instruction set, hardware multiplier and nanoWatt XLP technology that drops standby current below 100 nA in sleep mode, fitting the hierarchy MCU -> 8-bit MCU -> PIC18 -> nanoWatt XLP family -> power-sensitive embedded controller.
Key features include 25 general-purpose I/O pins, a 10-bit ADC with up to 14 channels, multiple serial interfaces (EUSART, MSSP for SPI/I2C), Capture/Compare/PWM modules, and a wide operating voltage range of 1.8 V to 3.6 V. The device supports industrial -40 C to +85 C operation with self-programming Flash and an on-chip ICD debugger interface for in-circuit development.
The PIC18F25K20 uses a Harvard architecture with a 16-bit instruction word and an 8-bit data path, allowing single-cycle 200 ns execution. Its nanoWatt XLP modes (Run, Idle, Sleep and deep Sleep with RTCC) target battery-powered designs where quiescent draw dominates lifetime.
Typical applications include battery-powered sensor nodes, USB HID peripherals, white-goods and HVAC control, industrial automation nodes, and low-power IoT edge devices. Engineers select it when code density, deterministic timing and ultra-low sleep current matter more than raw CPU throughput.
Design trade-off: the PIC18F25K20 has no integrated USB transceiver, so USB designs need an external PHY or use the PIC18F25K22 variant. Always derate clock frequency at 3.0 V VDD; below 2.5 V the maximum FOSC drops to about 40 MHz.
This page synthesizes distributor pricing, XLP drop-in alternatives in the same SOIC-28 footprint, and practical design notes not collected in a single place in the manufacturer datasheet.
直接替換替代品，適用於 PIC18F25K20T-I/SO — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC18F25K20T-I/SO （相同外形與佔位） — 差異在於 Package, Timers, Operating Temperature, ADC, Communication.
PIC18F25K20-I/SO
✅ 直接替換聯絡詢價
查看資料表 →PIC18F25K20-I/SS
✅ 直接替換聯絡詢價
查看資料表 →PIC18F25K20T-I/ML
✅ 直接替換聯絡詢價
查看資料表 →PIC18F24K20T-I/SO
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC18F25K22-I/SO
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC18F25J10-I/SO
✅ 直接替換聯絡詢價
查看資料表 →PIC18F2550-I/SO
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC18F25K20T-I/SO 最大額定值與電氣特性
| Core | PIC18 8-bit RISC |
| CPU Architecture | Harvard, 16-bit instruction / 8-bit data |
| Family | PIC18F XLP nanoWatt |
| Maximum CPU Speed | 64 MHz (16 MIPS) |
| Program Memory (Flash) | 32 KB (16K x 16) |
| Data SRAM | 1.5 KB (1536 bytes) |
| Data EEPROM | 256 bytes |
| Operating Voltage | 1.8 V to 3.6 V |
| I/O Pins | 25 |
| ADC | 10-bit, up to 14 channels |
| Timers | 4 (Timer0/1/2/3) |
| Capture/Compare/PWM | 2 ECCP + 1 CCP |
| Serial Interfaces | EUSART + MSSP (SPI / I2C) |
| 封裝 | 28-pin SOIC wide (7.50 mm / 0.295 in) |
| 安裝類型 | Surface Mount, Tape & Reel |
| 工作溫度 | -40 C to +85 C (Industrial, "I") |
| MSL 等級 | 1 (unlimited at <30 C / 85% RH) |
| RoHS 狀態 | Compliant |
| Instruction Set | PIC18 enhanced (77 instructions) |
| Self-Programming Flash | Yes (ICSP) |
| On-chip Debug | ICD via PGC/PGD |
PIC18F25K20T-I/SO 腳位配置
| 腳位 1 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| 腳位 2 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| 腳位 3 | RA2/AN2/VREF- — Port A bit 2 / Analog input 2 / ADC VREF- |
| 腳位 4 | RA3/AN3/VREF+ — Port A bit 3 / Analog input 3 / ADC VREF+ |
| 腳位 5 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| 腳位 6 | RA5/AN4/SS/HLVDIN — Port A bit 5 / Analog input 4 / SPI SS / HLVD input |
| 腳位 7 | VSS — Ground reference |
| 腳位 8 | OSC1/RA7/CLKI — Crystal input / Port A bit 7 / external clock in |
| 腳位 9 | OSC2/RA6/CLKO — Crystal output / Port A bit 6 / clock out |
| 腳位 10 | RC0/SOSCO — Port C bit 0 / SOSC oscillator out |
| 腳位 11 | RC1/SOSCI — Port C bit 1 / SOSC oscillator in |
| 腳位 12 | RC2/CCP1 — Port C bit 2 / Capture/Compare/PWM 1 |
| 腳位 13 | RC3/SCL/SCK — Port C bit 3 / I2C SCL / SPI SCK |
| 腳位 14 | RC4/SDA/SDI — Port C bit 4 / I2C SDA / SPI SDI |
| 腳位 15 | RC5/SDO — Port C bit 5 / SPI SDO |
| 腳位 16 | RC6/TX/CK — Port C bit 6 / EUSART TX / clock |
| 腳位 17 | RC7/RX/DT — Port C bit 7 / EUSART RX / data |
| 腳位 18 | VSS — Ground reference |
| 腳位 19 | VDD — Positive supply (1.8 V to 3.6 V) |
| 腳位 20 | RB0/INT0/FLT0 — Port B bit 0 / External int 0 / ECCP fault |
| 腳位 21 | RB1/INT1 — Port B bit 1 / External int 1 |
| 腳位 22 | RB2/INT2 — Port B bit 2 / External int 2 |
| 腳位 23 | RB3/CCP2 — Port B bit 3 / Capture/Compare/PWM 2 |
| 腳位 24 | RB4/KBI0 — Port B bit 4 / Keyboard interrupt 0 |
| 腳位 25 | RB5/KBI1/PGM — Port B bit 5 / Keyboard interrupt 1 / LVP prog |
| 腳位 26 | RB6/KBI2/PGC — Port B bit 6 / Keyboard interrupt 2 / ICSP clock |
| 腳位 27 | RB7/KBI3/PGD — Port B bit 7 / Keyboard interrupt 3 / ICSP data |
| 腳位 28 | VDD — Positive supply (1.8 V to 3.6 V) |
典型應用
PIC18F25K20T-I/SO 適用於 7 應用s: Battery-Powered Wireless Sensor Node, Industrial HVAC Control Module, USB HID Peripheral (with External PHY), White Goods / Home Appliance Control, Smart Meter / Energy Monitor, Automotive Body Electronics (Non-Safety), IoT Edge Node with Sensor Fusion.
Battery-Powered Wireless Sensor Node
The PIC18F25K20T-I/SO is well suited as the host MCU for low-power wireless sensor nodes. Its nanoWatt XLP sleep current drops below 100 nA with RTCC active, while 1.5 KB SRAM and 32 KB Flash are ample for sensor drivers and a small RF protocol stack. With a 3 V coin cell supplying 1.8-3.6 V across the part, expected battery life exceeds 5 years for duty-cycled sensing. Compared with running at full 64 MHz, the designer can spend 99 percent of time in deep Sleep waking only via WDT or IOC interrupt.
推薦
Industrial HVAC Control Module
For HVAC control boards the PIC18F25K20T-I/SO brings 25 I/O pins, a 14-channel 10-bit ADC and ECCP PWM for motor/valve drive. Industrial -40 C to +85 C operation matches indoor equipment environments. Its 16 MIPS at 64 MHz easily handles PID control loops, while ICSP allows field firmware updates without removing the board from the chassis. Compared with legacy PIC16F controllers, the K20's hardware multiplier and 32 KB Flash simplify field calibration tables.
推薦
USB HID Peripheral (with External PHY)
Although the K20 itself lacks an integrated USB transceiver, the PIC18F25K20T-I/SO can still drive an external USB FS PHY through its MSSP and EUSART, supporting low-speed HID class devices such as keyboards, mice or custom controllers. The 32 KB Flash is sufficient for HID report descriptors plus application logic, and the industrial temp grade suits commercial peripherals. Designers often prefer the related PIC18F25K50 if true integrated USB is required instead.
推薦
White Goods / Home Appliance Control
White-goods designs (washing machines, dishwashers, microwaves) commonly use the PIC18F25K20T-I/SO because of its balanced cost-per-feature ratio. The 10-bit ADC reads temperature and level sensors, ECCP modules drive triac-gated motors or heater elements, and the 25 I/O easily handle front-panel key matrices. Wide VDD tolerance protects against rectified-transformer rail ripple common in appliance PSUs.
推薦
Smart Meter / Energy Monitor
Smart electricity meters and energy-monitoring sub-systems use the PIC18F25K20T-I/SO as a measurement MCU, leveraging its 10-bit ADC for current/voltage sensing and EUSART for modem or PLC communication. The deep Sleep current below 100 nA prolongs battery backup life during outages. Compared with 32-bit Cortex-M0 alternatives, the K20 typically costs less while providing adequate MIPS for IEC 62056-21 protocol parsing.
推薦
Automotive Body Electronics (Non-Safety)
Outside of safety-critical systems, the PIC18F25K20T-I/SO fits non-safety body controllers such as seat adjusters, mirror modules and ambient lighting. Note the "I" suffix covers industrial -40 C to +85 C; for under-hood or AEC-Q100 qualified automotive, use PIC18F25K20-E/SO (extended) or PIC18F25K20T-I/SO automotive-grade equivalents. The 64 MHz CPU handles CAN-capable companion ICs over SPI for body-network nodes.
推薦
IoT Edge Node with Sensor Fusion
Edge-IoT nodes that aggregate temperature, humidity and motion data use the PIC18F25K20T-I/SO to perform local filtering before forwarding over BLE or LoRa. The hardware multiplier accelerates simple FIR filters, while 1.5 KB SRAM holds rolling sensor buffers. Deep Sleep mode plus IOC events allow event-driven wake-up. Compared with Cortex-M0+ options, the PIC18K20 typically achieves better sleep current at equivalent MIPS.
推薦
推薦產品摘要
工程參考資料，適用於 PIC18F25K20T-I/SO — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC18F25K20-I/SO | PIC18F25K20-I/SS | PIC18F25K20T-I/ML | PIC18F25K22-I/SO | PIC18F25J10-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (7.50 mm) | 28-SOIC (7.50 mm) - same | 28-SSOP - compatible | 28-QFN - compatible | 28-SOIC - same | 28-SOIC - same |
| Program Memory (Flash) | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| Data SRAM | 1.5 KB | 1.5 KB | 1.5 KB | 1.5 KB | 1.5 KB | 1.5 KB |
| Maximum CPU Speed | 64 MHz (16 MIPS) | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 40 MHz (-37%) |
| Operating Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 5.5 V | 2.0 V to 3.6 V |
| I/O Pins | 25 | 25 | 25 | 25 | 25 | 25 |
| Packaging Format | Tape & Reel (T) | Tube | Tube | Tape & Reel | Tube | Tube |
主要差異化特點
- Lowest-cost Microchip 28-SOIC variant in the family (對比PIC18F25K22-I/SO)
- Highest speed in the 28-SOIC K20 family (對比PIC18F25J10-I/SO)
- Tape & Reel format with identical die (對比PIC18F25K20-I/SO)
設計說明
Place a 100 nF decoupling capacitor as close as possible to each VDD pin (pins 19 and 28 on the 28-SOIC) and a bulk 10 uF tantalum or ceramic at the regulator output. For nanoWatt XLP designs where deep Sleep current falls below 100 nA, ensure no high-impedance pull-ups leak current when the MCU is asleep - use the internal weak pull-ups only on wake-up interrupt pins. Estimated: total quiescent draw with one enabled IOC input and 100 nF bypass is about 200 nA at 3.0 V.
Do not apply VDD above 3.6 V; the K20 is a 1.8-3.6 V part and the VDD absolute max is 4.0 V. Engineers migrating from PIC18F45K20 5 V designs must add a regulator. Also, the 64 MHz FOSC requires VDD >= 2.7 V; below 2.5 V maximum FOSC drops to about 40 MHz, and at 1.8 V the practical ceiling is 16 MHz. Verify crystal load capacitance matches the chosen resonator's CL spec, otherwise HFINTOSC may be a safer default.
Keep the ICSP lines PGC (RB6) and PGD (RB7) accessible in the layout - either through a 2x3 0.1 in header or test pads - so production can program firmware without rework. Place the crystal within 5 mm of OSC1/OSC2 with a guard ring tied to ground, and route RB6/RB7 away from switching nodes to avoid in-circuit debug glitches. For Tape & Reel builds verify land pattern matches JEDEC SOIC-28 wide-body (1.27 mm pitch).
合規資訊
RoHS and REACH compliance per Microchip product page; Pb-free matte-tin finish. "I" suffix is industrial temperature grade -40 C to +85 C, NOT AEC-Q100 qualified. For automotive use select -E (extended) or -VAO suffix.
