PIC18F4423T-I/PT - 8-bit MCU, 16KB Flash, 36 I/O, TQFP-44 | Microchip
MPN: PIC18F4423T-I/PT ✓ Hoạt độngPIC18F4423T-I/PT Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, optimized for embedded control tasks such as sensor reading, motor driving, user-interface handling, and low-to-moderate bandwidth communication. The PIC18 family sits within Microchip's 8-bit MCU hierarchy (PIC10/12/16/18) and is targeted at applications that require more peripherals and code space than baseline PIC16 parts but do not need the 16-bit dsPIC or 32-bit SAM architectures. Within that hierarchy the PIC18F4423 belongs to the 28/40/44-pin high-performance, enhanced-flash sub-family with nanoWatt power management and an integrated 10-bit A/D converter.
Key features of this part include 16 KB of self-programmable flash, nanoWatt technology for power-managed sleep and idle modes, a 10-bit A/D converter with up to 13 input channels, two analog comparators, a hardware USART, an MSSP module supporting SPI and I2C (both Master and Slave), and four 16-bit timer/counters. The 44-pin TQFP package exposes two capture/compare/PWM (CCP) modules plus one Enhanced CCP (ECCP) module, providing flexible PWM control for motor, lighting, and power-conversion loops. CIP (Core Independent Peripherals) functions let the timers, comparators, and PWM run autonomously without CPU intervention.
Architecturally the part uses a 16-bit instruction word with an 8-bit data bus, an 8x8 hardware multiplier, and a 31-level hardware stack. The enhanced flash controller supports self-programming and ICSP (In-Circuit Serial Programming) via two pins, allowing in-field firmware updates. Hardware-level interrupt handling, context saving on stack, and a vectored interrupt structure reduce jitter in real-time control loops. The instruction set is largely upward-compatible with the PIC16 family, easing migration of legacy firmware.
Typical applications include industrial control and sensor interface boards, low-cost HMI panels, small motor-control BLDC or stepper drivers, USB-to-UART bridges (when paired with an external transceiver), battery chargers, white-goods appliances, and general-purpose 5 V embedded designs that need 16 KB of code and a handful of analog inputs. The wide industrial temperature window also makes it suitable for outdoor installations and automotive under-hood subsystems outside the AEC-Q100 envelope.
Design consideration: when migrating to PIC18F46J11 or PIC18F46J50 the I/O mapping is not strictly identical - verify peripheral remapping tables before PCB respin. For noise-sensitive analog readings, route the analog VREF+ pin separately from digital VDD and add bulk-decoupling of at least 10 µF at the supply pin.
This page synthesizes distributor pricing, drop-in TQFP-44 alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers decide whether the PIC18F4423T-I/PT is the right fit for a 5 V, 16 KB-code, 36-I/O embedded design in 2026.
Bộ thay thế dễ dàng lắp đặt cho PIC18F4423T-I/PT — 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 PIC18F4423T-I/PT (cùng hình factor và footprint) — khác nhau ở Operating Temperature, Package, ADC, Timers, Communication.
PIC18F4423-I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F4420T-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4523-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F43K22-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18F4410T-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4423T-I/PT Tỷ lệ tối đa & tính chất điện
| Architecture | PIC18 8-bit enhanced RISC |
| Program Memory (Flash) | 16 KB |
| Data RAM | 768 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz (16 MIPS) |
| Supply Voltage (VDD) | 4.2 V to 5.5 V |
| I/O Pins | 36 |
| A/D Converter | 10-bit, up to 13 channels |
| Analog Comparators | 2 |
| Timers (16-bit) | 4 (Timer0/1/2/3) |
| CCP / ECCP Modules | 2 CCP + 1 ECCP |
| Communication | 1x USART (EUSART), 1x MSSP (SPI / I2C) |
| Nhiệt độ hoạt động | -40 °C to +85 °C (Industrial) |
| Hộp | TQFP-44 (PT), 10x10 mm |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân PIC18F4423T-I/PT
| Chân 1 | MCLR — Master Clear (reset) input, drive low to reset |
| Chân 2 | RA0/AN0 — Digital I/O / analog input channel 0 |
| Chân 3 | RA1/AN1 — Digital I/O / analog input channel 1 |
| Chân 4 | RA2/AN2/VREF- — Digital I/O / analog input / ADC VREF- |
| Chân 5 | RA3/AN3/VREF+ — Digital I/O / analog input / ADC VREF+ |
| Chân 6 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Chân 7 | RA5/AN4/SS — Digital I/O / analog input / SPI slave select |
| Chân 8 | VSS — Ground reference |
| Chân 9 | OSC1/CLKI/RA7 — External clock input / oscillator pin 1 |
| Chân 10 | OSC2/CLKO/RA6 — Oscillator pin 2 / system clock output |
| Chân 11 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / clock input |
| Chân 12 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / CCP2 PWM |
| Chân 13 | RC2/CCP1 — Digital I/O / CCP1 PWM output |
| Chân 14 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Chân 15 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Chân 16 | RC5/SDO — Digital I/O / SPI data out |
| Chân 17 | RC6/TX/CK — Digital I/O / EUSART TX / clock |
| Chân 18 | RC7/RX/DT — Digital I/O / EUSART RX / data |
| Chân 19 | VSS — Ground reference |
| Chân 20 | VDD — Positive supply 4.2-5.5 V |
| Chân 21 | RB0/INT0/FLT0 — Digital I/O / external interrupt 0 / ECCP fault input |
| Chân 22 | RB1/INT1 — Digital I/O / external interrupt 1 |
| Chân 23 | RB2/INT2 — Digital I/O / external interrupt 2 |
| Chân 24 | RB3/CCP2 — Digital I/O / CCP2 PWM alternate |
| Chân 25 | RB4 — Digital I/O / interrupt-on-change |
| Chân 26 | RB5 — Digital I/O / interrupt-on-change |
| Chân 27 | RB6/PGC — Digital I/O / ICSP clock |
| Chân 28 | RB7/PGD — Digital I/O / ICSP data |
| Chân 29 | VSS — Ground reference |
| Chân 30 | VDD — Positive supply 4.2-5.5 V |
| Chân 31 | RD0/PSP0 — Digital I/O / parallel slave port bit 0 |
| Chân 32 | RD1/PSP1 — Digital I/O / parallel slave port bit 1 |
| Chân 33 | RD2/PSP2 — Digital I/O / parallel slave port bit 2 |
| Chân 34 | RD3/PSP3 — Digital I/O / parallel slave port bit 3 |
| Chân 35 | RD4/PSP4 — Digital I/O / parallel slave port bit 4 |
| Chân 36 | RD5/PSP5 — Digital I/O / parallel slave port bit 5 |
| Chân 37 | RD6/PSP6 — Digital I/O / parallel slave port bit 6 |
| Chân 38 | RD7/PSP7 — Digital I/O / parallel slave port bit 7 |
| Chân 39 | VSS — Ground reference |
| Chân 40 | VDD — Positive supply 4.2-5.5 V |
| Chân 41 | RE0/RD/AN5 — Digital I/O / parallel port read / analog input channel 5 |
| Chân 42 | RE1/WR/AN6 — Digital I/O / parallel port write / analog input channel 6 |
| Chân 43 | RE2/CS/AN7 — Digital I/O / parallel port chip-select / analog input channel 7 |
| Chân 44 | AVDD — Analog positive supply, route separately from VDD |
Ứng dụng tiêu biểu
PIC18F4423T-I/PT phù hợp cho 6 Áp dụngs: Industrial Sensor Interface Board, Small BLDC or Stepper Motor Controller, White-Goods Appliance Control, Battery Charger / Power Management Front-End, USB-to-UART Bridge Module, General-Purpose 5V Hobbyist / Education Platform.
Industrial Sensor Interface Board
The PIC18F4423T-I/PT fits industrial sensor interface boards because its 10-bit ADC with up to 13 input channels can digitize thermocouple, RTD, pressure transducer, and 4-20 mA current-loop signals with 4.88 mV resolution at 5 V. The 36 digital I/O pins handle multiple switch inputs, relay outputs, and alarm LEDs without external multiplexers. The 16 KB flash accommodates 4-20 mA loop transmitter firmware plus Modbus RTU stacks. Wide 4.2-5.5 V supply tolerates 24 V industrial rails down-regulated to 5 V. The -40 °C to +85 °C industrial temperature range suits unheated factory enclosures.
Được đề xuất
Small BLDC or Stepper Motor Controller
The PIC18F4423T-I/PT drives small BLDC or stepper motors through its 2 CCP plus 1 ECCP module, delivering up to three complementary PWM channels at up to 40 kHz with dead-band control. The ECCP supports half-bridge, full-bridge, and single-PWM modes needed for trapezoidal commutation. Hardware timers measure back-EMF zero-crossing without CPU overhead, freeing the core for sensorless startup algorithms. The 36 I/O lines handle Hall sensors, encoder inputs, and direction/enable signals. The 16 KB flash accommodates sensorless FOC or 6-step commutation tables for low-voltage fans and pumps.
Được đề xuất
White-Goods Appliance Control
White-goods appliances such as washing machines, dishwashers, and microwave ovens use the PIC18F4423T-I/PT because its 16 KB flash is sufficient for user-interface state machines, sensor processing, and safety interlocks. The 36 I/O drive seven-segment displays, keypads, buzzer, and triac outputs without external logic. The 10-bit ADC reads water level, temperature, and motor current. NanoWatt power management brings quiescent current below 1 µA in standby to meet Energy Star idle requirements. The industrial -40 °C to +85 °C range handles unheated garage and laundry-room environments.
Được đề xuất
Battery Charger / Power Management Front-End
The PIC18F4423T-I/PT fits lead-acid and Li-ion charger front-ends because its 10-bit ADC monitors battery voltage and charge current to within 0.5 percent, while the ECCP module drives a synchronous buck MOSFET pair via PWM. The 36 I/O lines handle charging-state LEDs, fault relays, and SMBus / I2C to gas-gauge ICs. The 16 KB flash implements CC-CV charge profiles with temperature-compensation lookup tables. The 4.2-5.5 V supply is compatible with 5 V USB input plus 12-24 V adapter down-conversion, common in consumer battery products.
Được đề xuất
USB-to-UART Bridge Module
The PIC18F4423T-I/PT paired with an external USB transceiver like MCP2200 implements a USB-to-UART bridge for legacy serial peripherals. The EUSART handles RS-232/RS-485 traffic at up to 115.2 kbps while the MSSP drives SPI peripherals. The 36 I/O expose additional GPIO for flow-control lines (RTS/CTS/DTR). The 16 KB flash holds USB CDC class driver state machines and bootloader firmware. Industrial temperature range suits factory-floor gateways and point-of-sale terminals that convert legacy serial devices to USB.
Được đề xuất
General-Purpose 5V Hobbyist / Education Platform
The PIC18F4423T-I/PT is well suited as a 5 V general-purpose hobbyist and education MCU because its 5 V tolerance removes the level-shifter hurdle common in modern 3.3 V designs, and its 16 KB flash accommodates full projects with bootloader overhead. The 36 I/O and 13 ADC channels let students interface LEDs, buttons, character LCDs, and potentiometers without external mux. MPLAB X IDE, XC8 compiler, and PICkit 5 programmer support the part for free. Industrial temperature range lets the same firmware ship in commercial products without re-validation.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18F4423T-I/PT — 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 | PIC18F4423-I/PT | PIC18F4420T-I/PT | PIC18F4523-I/PT | PIC18F43K22-I/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-44 (PT) | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same |
| Program Flash | 16 KB | 16 KB | 16 KB | 32 KB | 8 KB |
| Data RAM | 768 bytes | 768 bytes | 768 bytes | 1536 bytes | 512 bytes |
| Maximum CPU Speed | 40 MHz (16 MIPS) | 40 MHz (16 MIPS) | 40 MHz (10 MIPS) | 40 MHz (16 MIPS) | 64 MHz (16 MIPS) |
| Supply Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 2.3 V to 5.5 V |
| I/O Pins | 36 | 36 | 36 | 36 | 36 |
| A/D Converter | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 17 channels |
| CCP Modules | 2 CCP + 1 ECCP | 2 CCP + 1 ECCP | 2 CCP + 1 ECCP | 2 CCP + 1 ECCP | 3 CCP |
| Approx. Unit Price (1k qty) | $1.97 | $1.94 (tray discount) | $1.85 | $2.40 | $2.10 |
Bảo phân biệt quan trọng
- Tape & Reel packaging for pick-and-place lines (vsPIC18F4423-I/PT)
- Doubles flash for firmware headroom (vsPIC18F4523-I/PT)
- Newer K-series silicon with wider supply range (vsPIC18F43K22-I/PT)
Ghi chú thiết kế
Place at least one 10 µF bulk-decoupling capacitor and a 0.1 µF ceramic decoupling capacitor as close as possible to each VDD pin pair on the PIC18F4423T-I/PT. Route analog AVDD separately from digital VDD with a ferrite bead to keep ADC readings clean - the 10-bit ADC has only 4.88 mV resolution at 5 V, so 100 mV of digital-rail noise coupling into VREF+ will degrade effective accuracy by 10 LSBs. Estimated: at 40 MHz with all peripherals active the core draws about 12 mA, so the regulator must source at least 30 mA including I/O sink/source currents.
The TQFP-44 package has a thermal resistance of approximately 60 °C/W. Estimated: at 5 V supply and full-speed operation the part draws ~12 mA, dissipating only 60 mW worst case, so thermal management is generally not a concern. However, if the design is housed in a sealed enclosure with elevated ambient (>50 °C), verify that junction temperature stays below 125 °C. The industrial -40 °C to +85 °C operating range is rated for ambient air temperature; derating may be needed in still-air environments.
When laying out a 4-layer PCB for the PIC18F4423T-I/PT, place a continuous ground plane on layer 2 directly under the IC and avoid routing digital signals across that plane. Keep the 40 MHz crystal (or resonator) within 5 mm of pins 9-10 (OSC1/OSC2) and guard the traces with a ground ring to avoid coupling noise into the clock. Reserve one GND via per VDD pin pair for low-impedance return paths. Expose MCLR (pin 1) through a 10 kΩ pull-up to VDD, optionally with a 100 nF cap to ground for manual-reset debounce.
Do not exceed the 5.5 V absolute maximum on VDD - the PIC18F4423 is a 5 V part, not a 3.3 V part, but the I/O pins will tolerate brief transients to 5.5 V only. The MCLR pin has an internal clamp; do not drive MCLR externally beyond 13.5 V or you will forward-bias the ESD clamp. Configure the CONFIG register's oscillator, watchdog, and brown-out settings before exiting Reset - leaving them at default may cause runaway code or fail to start with low-voltage rails. Always read the latest errata DS80233 before committing to a layout.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - for automotive, consider PIC18F46K80-I/PT or PIC18F25K80T-I/SS. Halogen-free per Microchip environmental certification program.