PIC18F442-E/PT - 8-bit 40MHz 16KB Flash MCU 44-TQFP | Microchip
MPN: PIC18F442-E/PT ✓ Hoạt độngPIC18F442-E/PT Tóm tắt
A PIC18 microcontroller belongs to Microchip's 8-bit PIC family, which sits in the broader category of microcontrollers (MCU) - self-contained computing subsystems built around a CPU core, program memory, data memory, and integrated peripherals. The PIC18 family uses a RISC architecture with 77 single-word instructions and a 16-bit instruction word, which provides an upgrade path from earlier PIC16 and PIC12 devices while preserving code compatibility. PIC18F parts are commonly used in industrial control, automotive body electronics, and consumer appliances that require deterministic real-time behavior.
Key features include 10 MIPS performance, self-programming Flash, an ICD (In-Circuit Debugger) interface, nanoWatt power management with multiple idle and sleep modes, and an 8-channel 10-bit ADC. The Harvard architecture separates program and data buses for predictable instruction timing, and the peripheral pin-select function (on related F-series devices) simplifies PCB routing.
Typical applications for the PIC18F442-E/PT include industrial automation controllers, automotive body and HVAC modules, sensor signal conditioning, low-cost motor control (with PWM), embedded user interfaces, and battery-powered instruments that benefit from nanoWatt sleep current. The 256-byte EEPROM is useful for storing calibration constants or configuration data without external storage.
When designing with this part, note that the 4.2 V minimum supply voltage precludes true 3.3 V operation - choose the PIC18LF442 variant for low-voltage systems. Also verify the I/O current budget: total source/sink current across all ports must stay within the device's 200 mA aggregate limit.
This page synthesizes distributor pricing, drop-in TQFP-44 alternatives, and practical design notes drawn from Microchip datasheets and the PIC18F family reference manual - data not combined on any single manufacturer or distributor page.
Bộ thay thế dễ dàng lắp đặt cho PIC18F442-E/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 PIC18F442-E/PT (cùng hình factor và footprint) — khác nhau ở Operating Temperature, Package, ADC, Timers, Core Architecture.
PIC18F452-E/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F442-I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F452-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4420-E/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18F43K22-E/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F442-E/PT Tỷ lệ tối đa & tính chất điện
| Device Family | PIC18F |
| Core | 8-bit PIC18 RISC |
| Program Memory (Flash) | 16 KB (8K x 16 words) |
| Data Memory (RAM) | 768 bytes |
| Data EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Supply Voltage (Vdd) | 4.2 V to 5.5 V |
| Nhiệt độ hoạt động | -40C to +125C (Extended / Automotive grade) |
| I/O Pins | 36 |
| ADC | 10-bit, 8 channels |
| Capture/Compare/PWM | 2 modules |
| Serial Interfaces | SPI / I2C (MSSP) + USART |
| Timers | 4 (Timer0/1/2/3) |
| Hộp | 44-pin TQFP (10x10 mm), 'PT' suffix |
| Kiểu lắp đặt | Surface Mount |
| Instruction Set | 77 instructions, 16-bit word |
| Power-Saving Modes | nanoWatt (Idle, Sleep, RC_RUN) |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC18F442-E/PT
| Chân 1 | MCLR/VPP — Reset input / programming voltage |
| Chân 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Chân 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / ADC Vref- |
| Chân 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC Vref+ |
| Chân 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 7 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI slave select |
| Chân 8 | RE0/RD/AN5 — PORTE bit 0 / parallel read / analog input 5 |
| Chân 9 | RE1/WR/AN6 — PORTE bit 1 / parallel write / analog input 6 |
| Chân 10 | RE2/CS/AN7 — PORTE bit 2 / parallel chip select / analog input 7 |
| Chân 11 | VDD — Positive supply (+5V typical) |
| Chân 12 | VSS — Ground |
| Chân 13 | OSC1/CLKI — Crystal input / external clock |
| Chân 14 | OSC2/CLKO — Crystal output / clock output |
| Chân 15 | RC0/T1OSO/T13CKI — PORTC bit 0 / Timer1 oscillator output / Timer1/3 clock |
| Chân 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Chân 17 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Chân 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 19 | RD0/PSP0 — PORTD bit 0 / parallel slave port bit 0 |
| Chân 20 | RD1/PSP1 — PORTD bit 1 / parallel slave port bit 1 |
| Chân 21 | RD2/PSP2 — PORTD bit 2 / parallel slave port bit 2 |
| Chân 22 | RD3/PSP3 — PORTD bit 3 / parallel slave port bit 3 |
| Chân 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 25 | RC6/TX/CK — PORTC bit 6 / USART transmit / USART clock |
| Chân 26 | RC7/RX/DT — PORTC bit 7 / USART receive / USART data |
| Chân 27 | RD4/PSP4 — PORTD bit 4 / parallel slave port bit 4 |
| Chân 28 | RD5/PSP5 — PORTD bit 5 / parallel slave port bit 5 |
| Chân 29 | RD6/PSP6 — PORTD bit 6 / parallel slave port bit 6 |
| Chân 30 | RD7/PSP7 — PORTD bit 7 / parallel slave port bit 7 |
| Chân 31 | VSS — Ground |
| Chân 32 | VDD — Positive supply (+5V typical) |
| Chân 33 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Chân 34 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Chân 35 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Chân 36 | RB3/CCP2 — PORTB bit 3 / CCP2 output |
| Chân 37 | RB4 — PORTB bit 4 |
| Chân 38 | RB5 — PORTB bit 5 |
| Chân 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 40 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 41 | NC — Not connected (per datasheet) |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC18F442-E/PT phù hợp cho 6 Áp dụngs: Industrial Automation Controller, Automotive Body Electronics, Sensor Signal Conditioning Node, Low-Cost DC Motor / PWM Control, Embedded User Interface Controller, Battery-Powered Measurement Instrument.
Industrial Automation Controller
The PIC18F442-E/PT fits industrial automation controllers because its 40 MHz CPU (10 MIPS) executes deterministic control loops in well under 1 ms, the 36 I/O lines multiplex buttons, relays, and HMI lines without external logic, and the 10-bit 8-channel ADC reads 4-20 mA sensors with 0.1% resolution. Its 4.2-5.5V supply matches 24V->5V regulator rails common on PLC cards. Compared with newer Cortex-M0 parts, the PIC18F442 has deterministic interrupt latency and the well-documented PIC18 toolchain (MPLAB X + XC8) which simplifies maintenance.
Được đề xuất
Automotive Body Electronics
The PIC18F442-E/PT operates from -40C to +125C (E-grade) and is therefore suitable for non-safety automotive body modules such as HVAC flaps, seat controllers, mirror adjusters, and lighting nodes. Its 2 CCP/PWM modules drive small DC motors or LED strings directly with 10-bit duty resolution, while the MSSP drives SPI/I2C peripherals (sensor ICs, EEPROM, displays). For OBD-II or CAN-bus body integration, prefer the PIC18F26K80 family; for HVAC the PIC18F442-E/PT remains cost-optimized.
Được đề xuất
Sensor Signal Conditioning Node
The PIC18F442-E/PT's 8-channel 10-bit ADC samples multiple analog sensors at up to ~50 kS/s aggregate and applies digital filtering in firmware, eliminating external signal-conditioning ICs. The MSSP reads digital sensors (SPI temperature, I2C accelerometers) while the CPU publishes the processed result over USART or SPI. NanoWatt sleep modes reduce quiescent current below 1 uA for battery-driven environmental sensor nodes - useful in wireless mesh or remote-monitoring installations.
Được đề xuất
Low-Cost DC Motor / PWM Control
The PIC18F442-E/PT's two CCP/PWM modules generate 10-bit PWM outputs up to 40 kHz for brushed DC motors, solenoid drivers, and heater elements. Its 36 I/O handle direction, brake, and tachometer feedback, while the 10 MIPS throughput executes PI control loops at 10 kHz without jitter. The 4.2-5.5V supply powers directly from 5V USB or 6V battery packs - eliminating extra regulators. Drop in the PIC18F452-E/PT for code-heavy field-oriented control (FOC) variants.
Được đề xuất
Embedded User Interface Controller
The PIC18F442-E/PT drives character LCDs, LED matrices, and keypads with its 36 I/O and USART, hosting menus for appliances, instrument panels, or vending machines. Its 16 KB Flash stores multilingual UI strings, and the 256-byte EEPROM retains user settings through power cycles. The MSSP drives I2C/SPI peripherals such as RTCs, GPIO expanders, and OLED displays. Industrial temperature grade -40C to +85C handles outdoor kiosks and HVAC user interfaces.
Được đề xuất
Battery-Powered Measurement Instrument
The PIC18F442-E/PT's nanoWatt technology drops quiescent current below 1 uA in Sleep mode and ~10 uA in Idle, enabling multi-year battery life in portable meters, dataloggers, and wireless sensor nodes. The 10-bit ADC and 16 KB Flash store calibration tables in EEPROM and run statistical algorithms in firmware. The 4.2V minimum supply means a 3-cell AA or single Li-ion (3.7V) is not enough; choose the LF variant for true 3.3V operation.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18F442-E/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 | PIC18F452-E/PT | PIC18F442-I/PT | PIC18F452-I/PT | PIC18F4420-E/PT | PIC18F43K22-E/PT |
|---|---|---|---|---|---|---|
| Package | TQFP-44 | TQFP-44 - same | TQFP-44 - same | TQFP-44 - same | TQFP-44 - same | TQFP-44 - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB | 32 KB (+100%) | 16 KB (same) | 32 KB (+100%) | 16 KB (same) | 8 KB (-50%) |
| RAM | 768 bytes | 1536 bytes (+100%) | 768 bytes (same) | 1536 bytes (+100%) | 768 bytes (same) | 512 bytes (-33%) |
| EEPROM | 256 bytes | 256 bytes (same) | 256 bytes (same) | 256 bytes (same) | 256 bytes (same) | 256 bytes (same) |
| Maximum Clock | 40 MHz (10 MIPS) | 40 MHz (same) | 40 MHz (same) | 40 MHz (same) | 40 MHz (same) | 64 MHz (60% faster) |
| Operating Temperature | -40C to +125C (Extended) | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +125C (Extended) |
| 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 | 4.2 V to 5.5 V | 1.8 V to 5.5 V (broader) |
| I/O Pins | 36 | 36 (same) | 36 (same) | 36 (same) | 36 (same) | 36 (same) |
Bảo phân biệt quan trọng
- Extended -40C to +125C automotive temperature grade (vsPIC18F442-I/PT)
- Twice the Flash and RAM of nearest I-grade sibling (vsPIC18F452-I/PT)
- 40 MHz PIC18 performance with full peripheral set (vsPIC18F43K22-E/PT)
Ghi chú thiết kế
The PIC18F442-E/PT requires a clean 5V rail: place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD pin (pins 11 and 32) and a bulk 10 uF tantalum or ceramic capacitor on the main 5V supply. Estimated: at 40 MHz the core draws ~15 mA, so the regulator should source at least 50 mA with adequate headroom. Below 4.2V the device is out of specification - choose the PIC18LF442 variant for 3.3V systems.
Route the 40 MHz crystal traces (OSC1/OSC2) symmetrically and keep them short, surrounded by a ground pour to minimize EMI. The MCLR/VPP pin needs a 10 kohm pull-up to VDD and a 100 nF capacitor to ground for reliable reset; do not leave it floating. Place ICSP test points (PGC/RB6, PGD/RB7, MCLR, VDD, VSS) on the PCB edge to allow programming without disassembly.
Common pitfalls: (1) Total I/O current per pin is 25 mA source / 25 mA sink, but the aggregate for all pins is limited to 200 mA - exceeding this triggers thermal shutdown. (2) Configuration bits must be set correctly (oscillator, watchdog, brown-out, code protect) - failing to do so leaves the device unprogrammed. (3) The ADC requires the acquisition time (Tad) to be at least 1.6 us; default settings may not work with slow ADC clocks above 1 MHz.
The MSSP/SPI bus on PORTC (RC3 SCK, RC4 SDI/SDA, RC5 SDO) can run up to 10 MHz; at speeds above 5 MHz add 33 ohm series-termination resistors close to the source pins to dampen ringing. The I2C bus requires 4.7 kohm pull-ups to VDD (not 3.3V - the device is 5V); failing to provide adequate pull-up strength produces bus errors above 100 kHz.
Thông tin tuân thủ
RoHS compliant and lead-free per Microchip product page; the 'E' temperature grade is suited for many automotive body-electronics applications per Microchip's product family documentation, though AEC-Q100 conformance is family-level rather than part-level.