PIC18F442-E/L - 8-bit 40MHz 16KB Flash MCU | Microchip
料号： PIC18F442-E/L ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $12.03 | $12.03 |
| 10 | $10.83 | $108.30 |
| 100 | $9.62 | $962.00 |
| 500 | $8.42 | $4,210.00 |
| 1,000 | $7.22 | $7,220.00 |
PIC18F442-E/L 概述
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash/ROM), working memory (RAM), and a rich set of peripherals (timers, communication buses, ADC, PWM, I/O ports) into one package. PIC18F microcontrollers occupy the high-performance tier of Microchip's 8-bit PIC family, sitting above the baseline PIC16F parts, with an enhanced 16-bit instruction word, hardware multiplier, and a C-friendly architecture optimized for compiled-code density.
Key features of the PIC18F442-E/L include 34 digital I/O pins (shared with peripherals), two CCP (Capture/Compare/PWM) modules, an MSSP peripheral configurable as either SPI or I2C, an enhanced USART, a parallel slave port, and a self-programming capability that allows in-application firmware updates. The on-chip 10-bit ADC supports 8 channels with conversion rates suitable for sensor sampling, and nanoWatt Technology offers multiple idle/sleep modes for battery-friendly designs.
Typical applications include industrial control panels, motor-drive control loops, sensor signal conditioning, consumer appliance user interfaces, and embedded communication bridges where 8-bit deterministic real-time response outweighs the higher cost-per-MIPS of 32-bit MCUs. The wide 4.2V-5.5V supply range and the robust PLCC socket-mount footprint also favor legacy designs and through-hole production lines that have not migrated to QFN.
When designing with this MCU, allocate attention to oscillator configuration (HS/HSPLL for 40 MHz), the ADC acquisition time register (ACQT), and the brown-out reset (BOR) thresholds to ensure reliable startup in noisy industrial environments. Note the E suffix indicates the Extended (-40C to +125C) temperature range, distinct from the I (-40C to +85C) variant.
This page consolidates distributor pricing, drop-in alternatives within the 44-PLCC footprint, and practical design notes not duplicated on the manufacturer datasheet.
直接替换替代料： PIC18F442-E/L ——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： PIC18F442-E/L （相同外形与封装尺寸） ——差异在于 Package, Mounting Type, Serial Interfaces, Analog-to-Digital Converter, Capture/Compare/PWM Modules.
快速对比工具——选择替代料号进行并排对比：
PIC18F442-I/L
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$3.75 / 个
查看数据手册 →PIC18F452-E/L
✅ 直接替换✓ 有现货
$8.4 / 个
查看数据手册 →PIC18F452-I/L
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$6.85 / 个
查看数据手册 →PIC18F442-E/L 最大额定值与电气特性
| Program Memory Size (Flash) | 16 KB |
| RAM Size | 768 bytes |
| EEPROM Size | 256 bytes |
| CPU Core | PIC18 8-bit RISC (enhanced) |
| Maximum CPU Frequency | 40 MHz |
| Instruction Throughput | 10 MIPS (4 cycles per instruction) |
| Supply Voltage (Vdd) | 4.2 V to 5.5 V |
| I/O Pins | 34 |
| ADC | 10-bit, up to 8 channels |
| CCP/PWM Modules | 2 |
| MSSP (SPI / I2C) | 1 |
| Enhanced USART | 1 |
| Parallel Slave Port | Yes |
| Self-Programming | Yes |
| 工作温度 | -40 C to +125 C (Extended, E suffix) |
| 封装 | 44-pin PLCC (J-Lead, L suffix) |
| 安装类型 | Surface Mount (PLCC socket compatible) |
| Technology | nanoWatt Technology (managed power modes) |
PIC18F442-E/L 引脚配置
| 引脚 1 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| 引脚 2 | RB3/CCP2 — PORTB bit 3 / CCP2 module I/O |
| 引脚 3 | RB4 — PORTB bit 4 |
| 引脚 4 | RB5 — PORTB bit 5 |
| 引脚 5 | RB6/PGC — PORTB bit 6 / ICSP clock |
| 引脚 6 | RB7/PGD — PORTB bit 7 / ICSP data |
| 引脚 7 | VDD — Positive supply (4.2 V to 5.5 V) |
| 引脚 8 | VSS — Ground reference |
| 引脚 9 | OSC1/CLKI — Crystal oscillator input / external clock |
| 引脚 10 | OSC2/CLKO — Crystal oscillator output |
| 引脚 11 | RA0/AN0 — PORTA bit 0 / ADC input 0 |
| 引脚 12 | RA1/AN1 — PORTA bit 1 / ADC input 1 |
| 引脚 13 | RA2/AN2/VREF- — PORTA bit 2 / ADC input 2 / ADC VREF- |
| 引脚 14 | RA3/AN3/VREF+ — PORTA bit 3 / ADC input 3 / ADC VREF+ |
| 引脚 15 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| 引脚 16 | RA5/AN4/SS — PORTA bit 5 / ADC input 4 / SPI slave select |
| 引脚 17 | RE0/RD/AN5 — PORTE bit 0 / Parallel Slave Port read / ADC input 5 |
| 引脚 18 | RE1/WR/AN6 — PORTE bit 1 / Parallel Slave Port write / ADC input 6 |
| 引脚 19 | RE2/CS/AN7 — PORTE bit 2 / Parallel Slave Port chip select / ADC input 7 |
| 引脚 20 | VDD — Positive supply (second VDD pin) |
| 引脚 21 | VSS — Ground (second VSS pin) |
| 引脚 22 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / clock input |
| 引脚 23 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 alt |
| 引脚 24 | RC2/CCP1 — PORTC bit 2 / CCP1 module I/O |
| 引脚 25 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| 引脚 26 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| 引脚 27 | RC5/SDO — PORTC bit 5 / SPI data out |
| 引脚 28 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| 引脚 29 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| 引脚 30 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| 引脚 31 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| 引脚 32 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| 引脚 33 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| 引脚 34 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| 引脚 35 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| 引脚 36 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| 引脚 37 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| 引脚 38 | VSS — Ground (third VSS pin) |
| 引脚 39 | VDD — Positive supply (third VDD pin) |
| 引脚 40 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| 引脚 41 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| 引脚 42 | MCLR/VPP — Master clear reset / programming voltage |
| 引脚 43 | NC — Not connected (per datasheet PLCC pinout) |
| 引脚 44 | NC — Not connected (per datasheet PLCC pinout) |
典型应用
PIC18F442-E/L 适用于 6 应用s: Industrial Control Panels, Sensor Signal Conditioning & Data Acquisition, Motor Control & PWM Drives, Consumer Appliance User Interfaces, Embedded Communication Bridges (SPI/I2C/UART), Legacy Through-Hole / Socket-Compatible Designs.
Industrial Control Panels
The PIC18F442-E/L fits industrial control panels because its 40 MHz / 10 MIPS core, 34 I/O pins, and 10-bit 8-channel ADC handle button scanning, LED/relay driving, sensor acquisition, and Modbus-style RS-485 comms in a single chip. The 16 KB Flash is sufficient for typical HMI logic, while 256 bytes EEPROM retains calibration and fault logs across power cycles. Its 4.2 V to 5.5 V supply rides 24 V industrial rails after regulation, and the -40/+125 C E grade tolerates cabinet temperatures. nanoWatt idle modes drop consumption between operator actions, satisfying industrial energy budgets without an external RTC.
推荐
Sensor Signal Conditioning & Data Acquisition
Sensor-front-end designs benefit from the PIC18F442-E/L's 10-bit 8-channel ADC running at hundreds of ksps and its hardware CCP/PWM blocks for excitation drive. The 34 I/O lines accommodate multiple analog inputs plus digital trigger lines, and 768 bytes of RAM buffer moderate-size sample streams before serial upload. The 5 V supply powers legacy analog sensors (bridge, RTD front-ends) directly, and the E temperature grade supports outdoor or factory-floor deployment. Self-programming Flash enables field calibration firmware upgrades without board removal.
推荐
Motor Control & PWM Drives
Two CCP/PWM modules on the PIC18F442-E/L generate complementary PWM pairs for brushed DC or low-cost BLDC motor commutation, while the 10 MIPS core computes current-control loops in real time. The 34 I/O lines interface to Hall sensors, optocouplers, and gate-driver fault inputs. Hardware MSSP (SPI/I2C) talks to external digital potentiometers or current-sense ADCs, and the parallel slave port enables fast data exchange with a host controller for coordinated multi-axis systems. The -40/+125 C operation suits motor bay environments.
推荐
Consumer Appliance User Interfaces
Appliance HMIs (washing machines, microwave ovens, HVAC thermostats) leverage the PIC18F442-E/L's large 34 I/O pin count to drive 7-segment displays, keypads, and buzzer/relay outputs without external I/O expanders. The enhanced USART interfaces with Wi-Fi or BLE modules for smart-appliance connectivity, and the nanoWatt sleep mode drops the standby power below ENERGY STAR thresholds. The 4.2-5.5 V supply is well-suited to rectified 5 V rails typical in appliance power supplies. 256 bytes EEPROM stores user preferences and fault histories across brown-outs.
推荐
Embedded Communication Bridges (SPI/I2C/UART)
The PIC18F442-E/L acts as a protocol bridge between SPI sensors, I2C peripherals, and a host UART/CAN link. Its MSSP supports both SPI master/slave and I2C master/slave, while the enhanced USART handles RS-232/RS-485 framing. Self-programming Flash allows field upgrades to the bridge firmware when new sensor types are added. 16 KB Flash and 768 bytes RAM are sufficient for streaming translation buffers in metering and asset-tracking applications where latency budgets are tens of milliseconds.
推荐
Legacy Through-Hole / Socket-Compatible Designs
The PIC18F442-E/L's 44-PLCC package with J-leads accepts standard PLCC sockets, allowing fast socketed programming, field replacement, and breadboard-style prototyping. The same die is offered in 40-pin DIP (/P) and 44-pin TQFP (/PT), letting a single firmware image target sockets, hand-wired prototypes, or reflow-soldered production boards. This makes the part ideal for educational labs, low-volume industrial retrofits, and design houses that maintain PLCC test fixtures and need a reliable long-life MCU source.
推荐
推荐产品汇总
工程参考数据： PIC18F442-E/L ——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 | PIC18F442-I/L | PIC18F452-E/L | PIC18F452-I/L |
|---|---|---|---|---|
| Package | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB | 16 KB | 32 KB | 32 KB |
| RAM | 768 bytes | 768 bytes | 1536 bytes | 1536 bytes |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Maximum CPU Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Operating Temperature Range | -40 C to +125 C (E grade) | -40 C to +85 C (I grade) | -40 C to +125 C (E grade) | -40 C to +85 C (I grade) |
| I/O Pins | 34 | 34 | 34 | 34 |
关键差异点
- Extended -40/+125 C operating temperature range （对比 PIC18F442-I/L)
- 16 KB Flash / 768 B RAM headroom for typical 8-bit firmware （对比 PIC18F452-E/L)
- PLCC socket compatibility for prototyping and field service （对比 PIC18F442-E/P (40-DIP))
设计说明
Place a 100 nF ceramic decoupling capacitor as close as possible to each VDD pin (the PIC18F442-E/L has three VDD pins and three VSS pins on the 44-PLCC package). Add a bulk 10 uF tantalum or aluminum electrolytic at the regulator output. MCLR/VPP must be tied to VDD through a 10 kohm resistor for normal operation; for ICSP programming, route this pin to the ICD header. Brown-Out Reset (BOR) should be enabled in CONFIG to ensure deterministic startup from 4.2 V supply rails.
Keep the 40 MHz crystal traces (OSC1/OSC2) short and surrounded by a ground pour to minimize EMI and jitter. Place load capacitors (typically 15-33 pF) within a few millimeters of the oscillator pins. Avoid routing digital signal traces (PORTD parallel slave port) under the crystal area. The ADC analog inputs (AN0-AN7) should be routed away from PWM outputs and digital switching lines to preserve 10-bit ADC accuracy.
Do not confuse the /L (44-PLCC) suffix with /P (40-DIP) or /PT (44-TQFP); only /L fits a PLCC socket. The E temperature suffix (-40 to +125 C) is required for automotive or industrial enclosures - using an I variant in those environments violates datasheet specs. Watch the configuration bits: the watchdog timer (WDT) is enabled by default in many factory configurations and must be explicitly disabled in software if not used, otherwise an unintended reset will occur. The CCP2 pin is multiplexed with PORTB and PORTC; verify the PPS setting before assigning it.
合规信息
RoHS and REACH compliant per Microchip product page; E temperature grade (-40/+125 C) supports but does not certify to AEC-Q100. Lead-free, halogen-free per Microchip environmental compliance disclosure.
