PIC18F25K42-I/SP - 32KB Flash 8-bit MCU 64MHz 28-SPDIP | Microchip
料号： PIC18F25K42-I/SP ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.78 | $3.78 |
| 10 | $3.42 | $34.20 |
| 100 | $3.05 | $305.00 |
| 500 | $2.78 | $1,390.00 |
| 1,000 | $2.51 | $2,510.00 |
PIC18F25K42-I/SP 概述
An 8-bit microcontroller (MCU) is a programmable integrated circuit that executes instructions from on-chip memory and interfaces with peripherals through digital and analog I/O pins. Within the broader taxonomy, an MCU belongs to microcontrollers -> microprocessors -> semiconductors -> integrated circuits. The PIC18F architecture implements an enhanced 8-bit RISC-like instruction set with hardware multiplier and 16-bit wide Flash, providing better code density than baseline PIC16 devices while retaining the simple peripheral and deterministic interrupt model that characterizes the PIC family.
Key features include a 12-bit ADC2 with computation, a 5-bit DAC, multiple comparators, configurable logic cells, Complementary Waveform Generator (CWG), and Zero-Cross Detect (ZCD) - giving the device an unusually rich set of analog and digital peripherals for an 8-bit MCU. Vectored interrupts, DMA, Peripheral Pin Select (PPS), and a Memory Access Partitioning (MAP) scheme provide system-level flexibility normally associated with 32-bit parts. The device also integrates a Windowed Watchdog Timer (WWDT) and CRC/SCAN hardware for functional safety.
Typical applications include industrial sensor conditioning, motor control loops, IoT edge nodes, low-power remote controls, and functional-safety subsystems. The wide peripheral set allows a single chip to replace a typical MCU plus external op-amp and analog mux circuit.
When designing, allocate decoupling capacitance (100 nF plus 10 uF bulk) close to VDD/AVDD pins, follow Microchip's SPDIP footprint (0.1 inch row pitch) for socket compatibility, and use ICD4 or PICkit 4 for debug.
This page synthesizes distributor pricing, drop-in alternatives in the same 28-SPDIP package, and engineering design notes that extend beyond the manufacturer datasheet, enabling faster BOM selection and procurement.
直接替换替代料： PIC18F25K42-I/SP ——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： PIC18F25K42-I/SP （相同外形与封装尺寸） ——差异在于 ADC, Package, Operating Temperature, DAC, Program Memory (Flash).
快速对比工具——选择替代料号进行并排对比：
PIC18F25K42-E/SP
✅ 直接替换✓ 有现货
$2.18 / 个
查看数据手册 →PIC18F25K42-I/SS
✅ 直接替换✓ 有现货
$1.78 / 个
查看数据手册 →PIC18F25K42-I/MV
✅ 直接替换✓ 有现货
$1.05 / 个
查看数据手册 →PIC18F24K42-I/SP
✅ 直接替换✓ 有现货
$1.65 / 个
查看数据手册 →PIC18F25K40-I/SSVAO
✅ 直接替换✓ 有现货
$1.62 / 个
查看数据手册 →PIC18F25K40-I/SP
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1.85 / 个
查看数据手册 →PIC18F25K42-I/SP 最大额定值与电气特性
| Program Memory (Flash) | 32 KB (16K x 16 words) |
| RAM | 2 KB |
| EEPROM | 256 bytes |
| CPU | 8-bit PIC18 enhanced RISC |
| Maximum CPU Speed | 64 MHz |
| Operating Voltage | 2.3 V to 5.5 V |
| ADC | 12-bit ADC2 with computation |
| DAC | 5-bit DAC |
| Comparators | Multiple on-chip |
| PWM Channels | Multiple CCP/PWM |
| Complementary Waveform Generator | Yes (CWG) |
| Zero-Cross Detect | Yes (ZCD) |
| Peripheral Pin Select (PPS) | Yes |
| DMA Channels | Yes |
| Vectored Interrupts | Yes |
| Windowed Watchdog Timer | Yes (WWDT) |
| Functional Safety (FuSa) | Yes - IEC 61508 SIL capable (Class B) |
| 工作温度 | -40C to +85C (industrial grade -I) |
| 封装 | 28-SPDIP (Skinny Plastic DIP, 0.1 inch pitch) |
| XLP Technology | Yes (eXtreme Low Power) |
| I/O Pins | 25 (typical for 28-pin PIC18F25K42) |
| RoHS 状态 | Compliant (lead-free SPDIP) |
PIC18F25K42-I/SP 引脚配置
| 引脚 1 | RA2 — General purpose I/O / analog input |
| 引脚 2 | RA3 — General purpose I/O / analog input |
| 引脚 3 | RA4 — General purpose I/O / analog input |
| 引脚 4 | RA5 — General purpose I/O / analog input |
| 引脚 5 | RA6 — General purpose I/O / OSC2 |
| 引脚 6 | RA7 — General purpose I/O / OSC1 |
| 引脚 7 | VSS — Ground reference |
| 引脚 8 | RB0 — General purpose I/O / INT0 / ZCD |
| 引脚 9 | RB1 — General purpose I/O / INT1 |
| 引脚 10 | RB2 — General purpose I/O / INT2 |
| 引脚 11 | RB3 — General purpose I/O / INT3 |
| 引脚 12 | RB4 — General purpose I/O / INT4 |
| 引脚 13 | RB5 — General purpose I/O / INT5 |
| 引脚 14 | RB6 — General purpose I/O / ICSCLK |
| 引脚 15 | RB7 — General purpose I/O / ICSDAT |
| 引脚 16 | VSS — Ground reference |
| 引脚 17 | VDD — Positive supply voltage |
| 引脚 18 | RC0 — General purpose I/O |
| 引脚 19 | RC1 — General purpose I/O |
| 引脚 20 | RC2 — General purpose I/O |
| 引脚 21 | RC3 — General purpose I/O / SCL |
| 引脚 22 | RC4 — General purpose I/O / SDA |
| 引脚 23 | RC5 — General purpose I/O |
| 引脚 24 | RC6 — General purpose I/O / TX |
| 引脚 25 | RC7 — General purpose I/O / RX |
| 引脚 26 | RE3 — General purpose I/O / MCLR |
| 引脚 27 | AVDD — Analog positive supply |
| 引脚 28 | AVSS — Analog ground reference |
典型应用
PIC18F25K42-I/SP 适用于 7 应用s: Industrial Sensor Conditioning and 4-20 mA Loop Transmitters, Functional Safety Subsystems (IEC 61508 SIL Class B), Low-Power IoT Edge Nodes and Remote Controls, Motor Control Loops (BLDC, Stepper, DC), Smart Appliance User Interface Boards, Automotive Body and Lighting Modules (Non-Safety Domain), Educational and Hobbyist Development Platforms.
Industrial Sensor Conditioning and 4-20 mA Loop Transmitters
The PIC18F25K42-I/SP fits 4-20 mA industrial sensor loops where its 12-bit ADC2 with computation, on-chip DAC, and zero-cross detect (ZCD) enable single-chip analog front-end plus control. The 32 KB Flash accommodates MODBUS RTU or HART-like state machines, while DMA offloads ADC-to-RAM transfers without CPU intervention. At 64 MHz the part runs deterministic control loops at sub-millisecond rates. XLP nanoWatt sleep drops below 100 nA typical, allowing loop-powered designs where total quiescent draw must stay under 3.5 mA.
推荐
Functional Safety Subsystems (IEC 61508 SIL Class B)
The PIC18F25K42-I/SP carries Microchip's Functional Safety (FuSa) certification documentation for IEC 61508 SIL Class B, with FMEDA, diagnostic libraries, and a safety manual. Its on-chip WWDT, CRC/SCAN, PLL lock monitor, and clock fail detection satisfy the self-test and watchdog coverage requirements typical of safety instrumented functions. Designers use it in safety shutdown paths for industrial machinery, gas detectors, and emergency-stop controllers where the SPDIP package aids field-serviceability in retrofits.
推荐
Low-Power IoT Edge Nodes and Remote Controls
PIC18F25K42-I/SP's XLP technology enables IoT edge nodes running for years on a single battery - typical sleep current is sub-100 nA with RTC and WWDT active. The 64 MHz wake-up speed lets the CPU execute protocol stacks (LoRaWAN, Wireless M-Bus) without expensive crystal warm-up. PPS remapping allows flexible PCB routing, and the 32 KB Flash fits compressed protocol stacks. The device's wide 2.3 V to 5.5 V range also supports direct coin-cell or 2xAA operation.
推荐
Motor Control Loops (BLDC, Stepper, DC)
PIC18F25K42-I/SP integrates a Complementary Waveform Generator (CWG), multiple PWM channels, and a 5-bit DAC that together drive MOSFET gate drivers in single-chip BLDC or stepper control loops. The 12-bit ADC2 samples back-EMF and current shunt feedback, while DMA streams ADC results into RAM without CPU overhead. Vectored interrupts keep the control loop deterministic, and 64 MIPS throughput leaves headroom for commutation, current PI, and fault handling in one device.
推荐
Smart Appliance User Interface Boards
For HMI control boards in white goods and small appliances, PIC18F25K42-I/SP drives segment LCD or LED displays, scans capacitive or matrix keypads, and runs user-interface state machines. The 256 B EEPROM stores user settings without battery backup, while the 2 KB RAM handles display buffer and protocol state. Its industrial -40C to +85C rating survives kitchen and laundry environments, and the SPDIP package eases manual rework during development and field service.
推荐
Automotive Body and Lighting Modules (Non-Safety Domain)
Beyond the K42 family, designers use PIC18F25K42-I/SP in automotive body controllers where AEC-Q100 isn't mandatory but the industrial -40C to +85C range is acceptable. Applications include interior lighting PWM, mirror control, and seat-position memory. The on-chip ZCD enables AC mains-zero detection for TRIAC-driven incandescent lamps, and CWG produces dead-band-corrected complementary drive for half-bridge MOSFET output stages in LED drivers.
推荐
Educational and Hobbyist Development Platforms
The PIC18F25K42-I/SP's 28-SPDIP package makes it breadboard-friendly for students and hobbyists learning embedded development. Microchip's MPLAB X IDE, XC8 compiler, and PICkit 4 programmer support the device, with MPLAB Code Configurator (MCC) generating peripheral init code. The K42 family is widely used in university curricula due to its rich peripheral set at a sub-$4 price point and the availability of Curiosity development boards.
推荐
推荐产品汇总
工程参考数据： PIC18F25K42-I/SP ——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 | PIC18F25K42-E/SP | PIC18F24K42-I/SP | PIC18F25K40-I/SP |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SPDIP | 28-SPDIP - same | 28-SPDIP - same | 28-SPDIP - same |
| Flash Memory | 32 KB | 32 KB | 16 KB | 32 KB |
| RAM | 2 KB | 2 KB | 1 KB | 2 KB |
| Max CPU Speed | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| ADC | 12-bit ADC2 | 12-bit ADC2 | 12-bit ADC2 | 10-bit ADC (older) |
| CWG / ZCD | Yes (both) | Yes (both) | Yes (both) | No |
| Functional Safety (FuSa) | Yes (IEC 61508 Class B) | Yes (IEC 61508 Class B) | Yes (IEC 61508 Class B) | No |
| Temperature Grade | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
关键差异点
- Functional Safety documentation for IEC 61508 SIL Class B （对比 PIC18F25K22-I/SP)
- 12-bit ADC2 with computation vs prior-gen 10-bit ADC （对比 PIC18F25K40-I/SP)
- DMA + Peripheral Pin Select (PPS) on-chip （对比 PIC18F25K22-I/SP)
设计说明
The PIC18F25K42-I/SP operates from 2.3 V to 5.5 V; place a 100 nF decoupling capacitor as close as possible to each VDD/AVDD pin (pins 17 and 27), with a 10 uF bulk capacitor near the MCU. Separate AVDD/AVSS routing from noisy digital VDD/VSS to maximize ADC2 SNR. In XLP sleep modes the device draws sub-100 nA typical, so a power-on reset time of approximately 1 ms from VDD ramp should be budgeted before code execution.
For SPDIP-28 footprints use 0.1 inch (2.54 mm) row pitch with through-hole pads sized 0.9 mm drill / 1.8 mm land. Keep MCLR (pin 26) accessible for in-circuit serial programming (ICSP) - route ICSCLK and ICSDAT to dedicated RB6/RB7 pins without intervening buffers. Maintain a continuous ground plane under the device for EMI suppression, especially when using PWM/CWG outputs at high switching rates.
Do not assume the K42 peripheral library is compatible with K40 firmware without review - the SFR map for ADC2, CWG, and ZCD differs from prior-gen peripherals. When migrating from PIC18F25K22 to PIC18F25K42, recompile against MCC-generated init code and verify interrupt vector mapping. Pin 26 (RE3/MCLR) is input-only and shares the MCLR function by default; disabling MCLR via configuration bits frees it as digital I/O but disables ICSP.
The 28-SPDIP package has a thermal resistance of approximately 70 C/W theta_JA (estimated for through-hole PDIP on a standard test PCB, no heatsink). At maximum CPU activity drawing 15 mA and VDD=5.5 V, power dissipation is roughly 82 mW giving a junction temperature rise of about 5.7 C above ambient. For the industrial -I grade with +85C max ambient, this leaves comfortable headroom. For -E/SP extended grade (+125C ambient), confirm your PCB layout keeps the device within its thermal envelope.
合规信息
RoHS compliant lead-free SPDIP package. Functional Safety (FuSa) documentation available for IEC 61508 SIL Class B - separate from AEC-Q100 automotive qualification. Not AEC-Q100 qualified; for AEC-Q100 grade choose PIC18F25K22-I/SS variants.
