PIC18F4423-E/P - 8-bit 16KB Flash MCU, 40MHz, 40-DIP | Microchip
MPN： PIC18F4423-E/P ✓ 啟用中PIC18F4423-E/P 概覽
A PIC18F microcontroller is a Harvard-architecture 8-bit RISC MCU belonging to the wider microcontroller (MCU) family - a category of single-chip computers that integrate CPU, RAM, non-volatile program memory, and peripherals. Within the PIC family hierarchy, PIC18F sits in the enhanced mid-range tier (between PIC16F baseline and dsPIC30/33 DSP families), offering 16-bit instructions, 31-level stack, and C-friendly architecture. PIC18F MCUs are widely used in industrial control, automotive body electronics, and consumer products where deterministic real-time performance and 5 V tolerance are required.
Key features of the PIC18F4423-E/P include 16 KB Flash program memory, 768 bytes of RAM, 256 bytes of EEPROM, 25 mA source/sink per I/O, four timer modules (Timer0/1/2/3), a 10-bit ADC with 13 input channels, and two enhanced capture/compare/PWM (ECCP) modules. The device supports ICSP (In-Circuit Serial Programming) and ICD (In-Circuit Debugging) via the MPLAB ecosystem.
The PIC18F4423-E/P's 40-pin PDIP footprint and 5 V tolerance make it a direct successor to legacy PIC16F and early PIC18F designs. It is widely deployed where hand-solderable through-hole assembly and robust 5 V I/O are required - notably industrial automation modules, HVAC controllers, motor control boards, and instrumentation front-ends.
When designing with this part, place a 100 nF decoupling capacitor within 5 mm of each VDD/VSS pin pair, and add a 10 uF bulk capacitor on the main supply rail. The MCLR reset pin requires a 10 kohm pull-up to VDD; the device can be programmed/debugged in-circuit via the ICSPDAT/ICSPCLK pins using the MPLAB PICkit 5.
直接替換替代品，適用於 PIC18F4423-E/P — 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： PIC18F4423-E/P （相同外形與佔位） — 差異在於 Package, I/O Pins, Maximum CPU Speed, Timers, Operating Temperature.
PIC18F4423-I/P
✅ 直接替換聯絡詢價
查看資料表 →PIC18F4423-E/P 最大額定值與電氣特性
| Core Architecture | 8-bit PIC18 enhanced RISC (Harvard) |
| Program Memory (Flash) | 16 KB |
| RAM | 768 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Supply Voltage (VDD) | 4.2 V to 5.5 V |
| I/O Pins | 36 |
| ADC | 10-bit, up to 13 channels |
| Comparators | 2 analog comparators |
| Timers | 4 (Timer0, Timer1, Timer2, Timer3) |
| ECCP/PWM Modules | 2 |
| Communication | 1x USART (RS-232/RS-485), 1x MSSP (SPI/I2C) |
| 工作溫度 | -40 C to +125 C (Extended, -E suffix) |
| 封裝 | 40-pin PDIP (DIP-40, 0.600 inch) |
| 安裝類型 | Through-Hole |
| ICSP/ICD | Yes (In-Circuit Serial Programming / Debug) |
| Power-Saving Modes | nanoWatt (Sleep, Idle, etc.) |
| Lead-Free / RoHS | Lead-Free finish (RoHS compliant per Microchip product page) |
PIC18F4423-E/P 腳位配置
| 腳位 1 | MCLR/RE3 — Master Clear (reset) input / digital input only on RE3 |
| 腳位 2 | RA0/AN0 — Digital I/O / analog input AN0 |
| 腳位 3 | RA1/AN1 — Digital I/O / analog input AN1 |
| 腳位 4 | RA2/AN2/VREF- — Digital I/O / analog input AN2 / ADC VREF- |
| 腳位 5 | RA3/AN3/VREF+ — Digital I/O / analog input AN3 / ADC VREF+ |
| 腳位 6 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| 腳位 7 | RA5/AN4/SS — Digital I/O / analog input AN4 / SPI slave select |
| 腳位 8 | RE0/RD/AN5 — Digital I/O / parallel-port read / AN5 |
| 腳位 9 | RE1/WR/AN6 — Digital I/O / parallel-port write / AN6 |
| 腳位 10 | RE2/CS/AN7 — Digital I/O / parallel-port chip select / AN7 |
| 腳位 11 | VDD — Positive supply voltage (4.2 V to 5.5 V) |
| 腳位 12 | VSS — Ground reference |
| 腳位 13 | OSC1/CLKI/RA7 — Crystal oscillator input / external clock input / digital I/O |
| 腳位 14 | OSC2/CLKO/RA6 — Crystal oscillator output / clock output / digital I/O |
| 腳位 15 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / Timer1 clock input |
| 腳位 16 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / CCP2 PWM output |
| 腳位 17 | RC2/CCP1 — Digital I/O / CCP1 PWM output |
| 腳位 18 | RC3/SCK/SCL — Digital I/O / MSSP SPI clock / I2C clock |
| 腳位 19 | RD0/PSP0 — Digital I/O / parallel slave port data bit 0 |
| 腳位 20 | RD1/PSP1 — Digital I/O / parallel slave port data bit 1 |
| 腳位 21 | RD2/PSP2 — Digital I/O / parallel slave port data bit 2 |
| 腳位 22 | RD3/PSP3 — Digital I/O / parallel slave port data bit 3 |
| 腳位 23 | RC4/SDI/SDA — Digital I/O / MSSP SPI data in / I2C data |
| 腳位 24 | RC5/SDO — Digital I/O / MSSP SPI data out |
| 腳位 25 | RC6/TX/CK — Digital I/O / USART asynchronous transmit / clock |
| 腳位 26 | RC7/RX/DT — Digital I/O / USART asynchronous receive / data |
| 腳位 27 | RD4/PSP4 — Digital I/O / parallel slave port data bit 4 |
| 腳位 28 | RD5/PSP5 — Digital I/O / parallel slave port data bit 5 |
| 腳位 29 | RD6/PSP6 — Digital I/O / parallel slave port data bit 6 |
| 腳位 30 | RD7/PSP7 — Digital I/O / parallel slave port data bit 7 |
| 腳位 31 | VSS — Ground reference |
| 腳位 32 | VDD — Positive supply voltage (4.2 V to 5.5 V) |
| 腳位 33 | RB0/INT0/FLT0 — Digital I/O / external interrupt 0 / ECCP fault input |
| 腳位 34 | RB1/INT1 — Digital I/O / external interrupt 1 |
| 腳位 35 | RB2/INT2 — Digital I/O / external interrupt 2 |
| 腳位 36 | RB3/CCP2A — Digital I/O / alternate CCP2 output |
| 腳位 37 | RB4 — Digital I/O with interrupt-on-change |
| 腳位 38 | RB5 — Digital I/O with interrupt-on-change |
| 腳位 39 | RB6/PGC/ICSPCLK — Digital I/O / ICSP clock / ICD clock |
| 腳位 40 | RB7/PGD/ICSPDAT — Digital I/O / ICSP data / ICD data |
典型應用
PIC18F4423-E/P 適用於 6 應用s: Industrial PLC I/O Modules, HVAC Thermostat Controllers, Brushless DC Motor Control, Automotive Body Electronics, Instrumentation and Data Loggers, Consumer Appliance Control Boards.
Industrial PLC I/O Modules
The PIC18F4423-E/P fits industrial PLC I/O modules because its 5 V I/O tolerance and -40 C to +125 C extended temperature grade allow direct interfacing to 24 V optically-isolated digital inputs and relay outputs without level shifters. The 13-channel 10-bit ADC reads analog sensor inputs (4-20 mA transducers scaled through sense resistors, NTC thermistors, potentiometers), while the two ECCP/PWM modules drive indicator LEDs, buzzer tones, or solid-state relay triggers. The 40-pin PDIP through-hole package simplifies hand-assembly and field-serviceable maintenance in DIN-rail cabinets.
推薦
HVAC Thermostat Controllers
The PIC18F4423-E/P is well-suited to HVAC thermostat controllers because its nanoWatt sleep modes (sub-microampere standby) extend battery life in wireless thermostats, while the 36 I/O pins drive LCD segments, push-button keypads, relay outputs, and triac optocouplers for furnace/AC control. The 10-bit ADC reads onboard thermistors (10K NTC type II/III) with adequate resolution for +/- 0.5 C temperature accuracy after linearization, and the USART interfaces to Wi-Fi/BLE modules for smart-thermostat networking. Extended temperature tolerance handles plenum-mounted installations.
推薦
Brushless DC Motor Control
The PIC18F4423-E/P drives small brushless DC (BLDC) and brushed DC motors because its two ECCP/PWM modules generate complementary 3-phase PWM at up to 40 MHz with hardware dead-band control, while the 13-channel 10-bit ADC samples back-EMF zero-crossings, current sense, and potentiometer speed reference. The USART provides a debug/command port, and the MSSP drives SPI encoders for closed-loop position control. With 16 KB Flash, sensorless or sensored BLDC firmware fits comfortably with room for adaptive commutation and fault-handling routines.
推薦
Automotive Body Electronics
The PIC18F4423-E/P serves body-electronics applications such as instrument cluster sub-modules, lighting controllers, seat controllers, and HVAC blend-door actuators because its -40 C to +125 C extended temperature grade and 5 V rail operation match automotive 12 V battery-direct systems after regulation. The 36 I/O pins drive LED drivers, button matrices, and LIN/CAN-friendly transceivers (USART to external LIN phy), while the ECCP modules generate PWM for LED dimming and small motor speed control. NanoWatt sleep drops quiescent to <1 uA to meet <100 uA parasitic-draw budgets on parked vehicles.
推薦
Instrumentation and Data Loggers
The PIC18F4423-E/P is widely used in portable instrumentation and data loggers because its 10-bit 13-channel ADC scans multiple sensor inputs (temperature, pressure, voltage, current) at up to ~100 ksps aggregate, and 768 bytes of RAM plus 256 bytes EEPROM buffer and store calibration constants between power cycles. The USART outputs ASCII or Modbus frames to host PCs, while the MSSP interfaces to SPI Flash or EEPROM for mass-storage of logged samples. Extended temperature grade handles outdoor and industrial cabinet environments where loggers are deployed.
推薦
Consumer Appliance Control Boards
The PIC18F4423-E/P is found in washing machines, dishwashers, microwave ovens, and small kitchen appliances because its 5 V tolerance interfaces directly to triac optocouplers, mechanical relays, and 7-segment LED displays without external level translation. The 16 KB Flash stores user-interface state machines and safety routines, while the ECCP modules drive triac phase-control or PWM for variable-speed pumps and fans. The through-hole 40-pin PDIP allows wave-solder assembly at lower cost than QFP packages for high-volume appliance manufacturing.
推薦
推薦產品摘要
工程參考資料，適用於 PIC18F4423-E/P — 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 | PIC18F4423-I/P | PIC18F4420-E/P | PIC18F4320-E/P | PIC18F4520-E/P |
|---|---|---|---|---|---|
| Package | 40-pin PDIP (DIP-40) | 40-pin PDIP (DIP-40) - same | 40-pin PDIP (DIP-40) - same | 40-pin PDIP (DIP-40) - same | 40-pin PDIP (DIP-40) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Flash | 16 KB | 16 KB - same | 8 KB (-50%) | 8 KB (-50%) | 32 KB (+100%) |
| RAM | 768 bytes | 768 bytes - same | 256 bytes (-67%) | 512 bytes (-33%) | 1536 bytes (+100%) |
| EEPROM | 256 bytes | 256 bytes - same | 256 bytes - same | 256 bytes - same | 256 bytes - same |
| Max CPU Speed | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS - same | 40 MHz / 10 MIPS - same | 40 MHz / 10 MIPS - same | 40 MHz / 10 MIPS - same |
| Supply Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V - same | 4.2 V to 5.5 V - same | 4.2 V to 5.5 V - same | 4.2 V to 5.5 V - same |
| Operating Temperature | -40 C to +125 C (Extended) | -40 C to +85 C (Industrial) | -40 C to +125 C (Extended) | -40 C to +125 C (Extended) | -40 C to +125 C (Extended) |
| ADC | 10-bit, 13 channels | 10-bit, 13 channels - same | 10-bit, 13 channels - same | 10-bit, 13 channels - same | 10-bit, 13 channels - same |
| I/O Pins | 36 | 36 - same | 36 - same | 36 - same | 36 - same |
主要差異化特點
- Highest Flash/RAM in 40-pin PDIP PIC18F4x20 family (對比PIC18F4420-E/P)
- Extended temperature grade for automotive/harsh-environment designs (對比PIC18F4423-I/P)
- Larger RAM and Flash than PIC18F4320-E/P for richer firmware (對比PIC18F4320-E/P)
設計說明
Place a 100 nF ceramic decoupling capacitor within 5 mm of every VDD/VSS pin pair (the PIC18F4423-E/P has two pairs: pins 11/12 and pins 31/32). Add a 10 uF bulk electrolytic or tantalum capacitor on the main 5 V rail near the MCU. If the supply is sourced from a switching regulator (e.g., 24 V to 5 V buck), add a ferrite bead or LC filter to attenuate switching ripple below 50 mVpp - the MCU is sensitive to VDD noise because the ADC reference is derived from VDD unless an external VREF+ is used. Estimated total decoupling budget: ~12 nF of ceramic plus 10 uF bulk is sufficient for 40 MHz operation.
The MCLR reset pin (pin 1) requires a 10 kohm pull-up resistor to VDD; some designs add a 100 nF capacitor from MCLR to VSS for hardware debounce of noisy power-on transients. The ICSPDAT (pin 40) and ICSPCLK (pin 39) pins double as RB7 and RB6 - keep the MPLAB ICSP header footprint on the PCB even if not populated in production, so future firmware updates and ICD debugging can be performed without rework. Keep crystal traces short and surrounded by a ground guard ring; place the load capacitors (typically 22-33 pF for HS mode at 20 MHz) within 5 mm of OSC1/OSC2.
Do not omit the 100 nF bypass on AVDD/VSS if you reference the ADC from VDD - noise on the supply rail couples directly into ADC readings. Do not drive the MCLR pin with an open-collector driver without the pull-up - the device will not exit reset reliably. When using the internal oscillator, calibrate the frequency via the OSCTUNE register; uncalibrated parts can vary by +/- 2% across temperature, which causes UART baud-rate errors above 9600 baud at +85 C. Finally, do not exceed 25 mA source or sink per I/O pin or 200 mA total VDD/VSS current - exceeding this damages the device.
合規資訊
Lead-free finish per Microchip product page; RoHS and REACH compliant. AEC-Q100 not formally qualified (extended temperature grade -E is intended for industrial / harsh-environment use, not full automotive qualification).
