PIC18LC442T-I/L - 16KB Flash, 8-bit MCU, 44-PLCC | Microchip
MPN： PIC18LC442T-I/L ✗ 停產PIC18LC442T-I/L 概覽
Background: A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash), working memory (RAM), and programmable I/O peripherals. The PIC18 family is Microchip's 8-bit RISC architecture, succeeding the PIC16 by adding a 16-bit instruction word (kept 8-bit for data path), hardware multiplier, and prioritized interrupts. The 'LC' suffix denotes the low-voltage CMOS variant optimized for 3.3V/5V dual-rail operation, while the 'I' suffix specifies the -40C to +85C industrial temperature range.
Key features include single-cycle hardware multiplication, priority-leveled interrupts, 10 MIPS sustained throughput, a wide 2.0V to 5.5V operating range, and built-in In-Circuit Serial Programming (ICSP) for field updates. The 33 I/O pins each source/sink up to 25 mA, enabling direct LED or relay drive without external buffers.
Architecturally, the device combines a Harvard-style RISC core with 16-bit instructions and an 8-bit data path, a 10-bit ADC with up to 8 input channels, three timer/counter modules, a USART with addressable mode, and a Master Synchronous Serial Port (MSSP) supporting SPI and I2C. The 16KB program memory is OTP/EPROM-based on the 'C' part family, distinguishing it from later flash-based PIC18F variants.
Typical applications include industrial automation controllers, HVAC sensor interfaces, motor control peripherals, low-end human-machine interface (HMI) panels, and embedded automotive body electronics. The wide voltage range also enables battery-powered instrumentation with single Li-ion cell support. Compared to PIC18F flash counterparts, the PIC18C EPROM variant is typically chosen for mature, mask-stable production runs.
Design consideration: When migrating to PIC18LC442T-I/L, ensure the PLL configuration and oscillator mode match the datasheet reference design; the 'LC' variant requires careful brown-out voltage selection for low-voltage operation. ISP/ICSP programming requires dedicated pin allocation that must be reserved during PCB design.
This page synthesizes distributor pricing, drop-in alternatives across the PIC18 family, and practical design notes not found in the manufacturer datasheet, including a side-by-side comparison with flash-based PIC18F equivalents.
直接替換替代品，適用於 PIC18LC442T-I/L — 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： PIC18LC442T-I/L （相同外形與佔位） — 差異在於 Operating Temperature, ADC, Package, Mounting Type, Timers.
PIC18F442T-I/L
✅ 直接替換聯絡詢價
查看資料表 →PIC18F452T-I/L
✅ 直接替換聯絡詢價
查看資料表 →PIC18C442T-I/L
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18C452T-I/L
✅ 直接替換聯絡詢價
查看資料表 →PIC18LC452T-I/L
✅ 直接替換聯絡詢價
查看資料表 →PIC18F458T-I/L
✅ 直接替換聯絡詢價
查看資料表 →PIC18LC442T-I/L 最大額定值與電氣特性
| Program Memory Size | 16 KB (8K x 16) |
| RAM Size | 512 bytes |
| Number of I/O | 33 |
| CPU Core | PIC18C 8-bit RISC |
| 最大時脈頻率 | 40 MHz |
| Instruction Throughput | 10 MIPS |
| Operating Voltage Range | 2.0 V to 5.5 V (3.3V/5V dual rail) |
| 工作溫度範圍 | -40C to +85C (industrial) |
| 封裝 / 外殼 | 44-LCC (J-Lead), PLCC-44 |
| 安裝類型 | Surface Mount |
| Program Memory Type | OTP/EPROM |
| ADC | 10-bit, multi-channel |
| Oscillator Type | External |
| Hardware Multiplier | Yes (single-cycle) |
| Packaging | Tape & Reel (TR) |
| RoHS 狀態 | Compliant |
| MSL 等級 | 3 (168 hours) |
PIC18LC442T-I/L 腳位配置
| 腳位 1 | MCLR — Master Clear (reset) input, active low |
| 腳位 2 | OSC1/RA7 — Oscillator pin 1 or digital I/O RA7 |
| 腳位 3 | OSC2/RA6 — Oscillator pin 2 or digital I/O RA6 |
| 腳位 4 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| 腳位 5 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| 腳位 6 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| 腳位 7 | RA3/AN3 — PORTA bit 3 / Analog input 3 / VREF+ |
| 腳位 8 | RA4/AN4 — PORTA bit 4 / Analog input 4 |
| 腳位 9 | RA5/AN5 — PORTA bit 5 / Analog input 5 |
| 腳位 10 | VSS — Ground reference |
| 腳位 11 | VDD — Positive supply voltage |
| 腳位 12 | RB0/INT0 — PORTB bit 0 / External interrupt 0 |
| 腳位 13 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| 腳位 14 | RB2/INT2 — PORTB bit 2 / External interrupt 2 |
| 腳位 15 | RB3/INT3 — PORTB bit 3 / External interrupt 3 |
| 腳位 16 | RB4 — PORTB bit 4 |
| 腳位 17 | RB5 — PORTB bit 5 |
| 腳位 18 | RB6/PGC — PORTB bit 6 / ICSP clock |
| 腳位 19 | RB7/PGD — PORTB bit 7 / ICSP data |
| 腳位 20 | VSS — Ground reference |
| 腳位 21 | VDD — Positive supply voltage |
| 腳位 22 | RC0 — PORTC bit 0 |
| 腳位 23 | RC1 — PORTC bit 1 |
| 腳位 24 | RC2 — PORTC bit 2 |
| 腳位 25 | RC3 — PORTC bit 3 |
| 腳位 26 | RC4 — PORTC bit 4 |
| 腳位 27 | RC5 — PORTC bit 5 |
| 腳位 28 | RC6/TX — PORTC bit 6 / USART transmit |
| 腳位 29 | RC7/RX — PORTC bit 7 / USART receive |
| 腳位 30 | VSS — Ground reference |
| 腳位 31 | VDD — Positive supply voltage |
| 腳位 32 | RD0 — PORTD bit 0 |
| 腳位 33 | RD1 — PORTD bit 1 |
| 腳位 34 | RD2 — PORTD bit 2 |
| 腳位 35 | RD3 — PORTD bit 3 |
| 腳位 36 | RD4 — PORTD bit 4 |
| 腳位 37 | RD5 — PORTD bit 5 |
| 腳位 38 | RD6 — PORTD bit 6 |
| 腳位 39 | RD7 — PORTD bit 7 |
| 腳位 40 | VSS — Ground reference |
| 腳位 41 | VDD — Positive supply voltage |
| 腳位 42 | RE0/RD — PORTE bit 0 / Read control for parallel slave port |
| 腳位 43 | RE1/WR — PORTE bit 1 / Write control for parallel slave port |
| 腳位 44 | RE2/CS — PORTE bit 2 / Chip select for parallel slave port |
典型應用
PIC18LC442T-I/L 適用於 6 應用s: Industrial Automation Controllers, HVAC Sensor Interface Boards, Low-End HMI / Display Panels, Motor Control Peripherals, Embedded Automotive Body Electronics, Battery-Powered Instrumentation.
Industrial Automation Controllers
The PIC18LC442T-I/L fits industrial automation controllers because its 16 KB OTP/EPROM program memory accommodates moderate-complexity PLC ladder logic, while the 33 I/O lines drive sensors, relays, and HMI displays directly without external buffers. The 10 MIPS throughput at 40 MHz handles real-time polling of multiple analog inputs via the 10-bit ADC and prioritized interrupts. Operating from 2.0V to 5.5V supports both 24V-sourced 5V rails and 3.3V logic compatibility for modern industrial backplanes.
推薦
HVAC Sensor Interface Boards
The PIC18LC442T-I/L is well suited to HVAC sensor interface boards thanks to its multi-channel 10-bit ADC for thermistor and pressure sensors, plus UART/USART connectivity for building management system (BMS) communication. The industrial -40C to +85C operating range covers rooftop equipment enclosures, and the wide 2.0V to 5.5V supply range supports battery-backed thermostats and 24VAC-derived rails. The 33 I/O enable direct control of relays, TRIACs, and indicator LEDs.
推薦
Low-End HMI / Display Panels
For low-end human-machine interface panels, the PIC18LC442T-I/L delivers 10 MIPS throughput to drive character LCDs and segmented LED displays while polling keypad inputs. The 33 I/O directly interface character-LCD data buses (4-bit or 8-bit mode) and 4x4 matrix keypads without external logic. The MSSP module provides SPI or I2C connectivity to dedicated display controller ICs, and the single-cycle hardware multiplier accelerates touch-panel coordinate calculations.
推薦
Motor Control Peripherals
The PIC18LC442T-I/L suits motor control peripherals including stepper drivers and small BLDC/PMSM commutation logic because the three timer/counter modules generate PWM outputs with flexible duty-cycle control. The 10 MIPS throughput sustains field-oriented control (FOC) loops for sub-kW motors, while the 33 I/O drive gate-driver enable signals, current-sense amplifiers, and Hall-effect sensor inputs. Operating voltage down to 2.0V supports Li-ion battery-powered robotics.
推薦
Embedded Automotive Body Electronics
The PIC18LC442T-I/L fits automotive body-electronics modules such as seat controllers, mirror adjusters, and lighting drivers. The 33 I/O source/sink 25 mA each, sufficient for LED arrays and small relay coils. The industrial -40C to +85C temperature range covers cabin environments, and the prioritized interrupts service CAN-LIN transceivers and switch-debounce events. OTP/EPROM provides design security by preventing firmware readout, valuable for aftermarket automotive parts.
推薦
Battery-Powered Instrumentation
The PIC18LC442T-I/L supports battery-powered instrumentation with its 2.0V to 5.5V supply range, enabling single Li-ion cell operation down to cutoff voltage. The 10 MIPS throughput with low-power SLEEP/IDLE modes suits portable data loggers and field measurement tools. The 10-bit ADC captures sensor data at low sample rates without external ADC ICs, and prioritized interrupts wake the CPU on measurement events. The wide industrial temperature range ensures outdoor deployment reliability.
推薦
推薦產品摘要
工程參考資料，適用於 PIC18LC442T-I/L — 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 | PIC18F442T-I/L | PIC18F452T-I/L | PIC18LC452T-I/L | PIC18C452T-I/L | PIC18F458T-I/L |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same |
| Program Memory Size | 16 KB (8K x 16) OTP/EPROM | 16 KB Flash | 32 KB Flash | 32 KB OTP/EPROM | 32 KB OTP/EPROM | 32 KB Flash |
| RAM Size | 512 bytes | 512 bytes | 1536 bytes | 1536 bytes | 1536 bytes | 1536 bytes |
| Number of I/O | 33 | 33 | 33 | 33 | 33 | 33 |
| Maximum Clock Frequency | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) |
| Operating Voltage Range | 2.0 V to 5.5 V (LC variant) | 2.0 V to 5.5 V (F variant) | 2.0 V to 5.5 V (F variant) | 2.0 V to 5.5 V (LC variant) | 4.2 V to 5.5 V (C variant) | 2.0 V to 5.5 V (F variant) |
| Program Memory Type | OTP/EPROM (one-time programmable) | Flash (reprogrammable) | Flash (reprogrammable) | OTP/EPROM | OTP/EPROM | Flash (reprogrammable) |
| CAN Module | No | No | No | No | No | Yes (CAN 2.0B) |
主要差異化特點
- Lower-voltage CMOS 'LC' variant with 2.0V minimum supply (對比PIC18C442T-I/L)
- Active NRND status offers defined supply continuity vs EOL (對比PIC18LC442-I/PT (TQFP variant))
- Hardware-software migration path to Flash variant available (對比PIC18F442T-I/L (Flash))
設計說明
PIC18LC442T-I/L operates from 2.0V to 5.5V, supporting both 3.3V and 5V rails. Decouple VDD/VSS pairs with 100 nF ceramic capacitors placed within 5 mm of each VDD pin; the device has multiple VDD pins (pins 11, 21, 31, 41) that all require decoupling. Brown-out reset voltage must be configured via configuration bits (BOREN, BORV1:BORV0) to match your supply rail. Estimated: total quiescent current at 5V/4 MHz is approximately 1.6 mA in normal run mode and under 1 uA in SLEEP mode per Microchip PIC18CXX2 datasheet typical curves.
The 44-PLCC (J-Lead) footprint is a surface-mount package with through-hole-style leads. Use a JEDEC-compliant land pattern with 1.27 mm pitch. Reserve the ICSP pins (RB6/PGC pin 18 and RB7/PGD pin 19) for in-circuit programming access; routing these to test points or a programming header is recommended for field firmware updates. Place the 40 MHz crystal/oscillator within 10 mm of OSC1/OSC2 (pins 2/3) with short symmetric traces to minimize parasitic capacitance.
Common pitfalls when designing with PIC18LC442T-I/L: (1) OTP/EPROM is one-time-programmable - firmware must be 100% verified before production programming; consider PIC18F442T-I/L Flash variant for in-field updates. (2) Pin 1 dot indicator on PLCC-44 may be confused with the chamfered corner; confirm pin numbering against the datasheet diagram. (3) The 'LC' suffix means 2.0V-5.5V operation - do not substitute the standard 'C' PIC18C442T-I/L without verifying the supply rail. (4) The 33 I/O pins share with analog inputs and ICSP functions; configure analog/digital modes correctly via ADCON1 register to avoid contention.
For mixed-signal designs, isolate the analog AVdd/AVss supply (driven from VDD/VSS via ferrite beads) and place the analog input traces (RA0-RA5, pins 4-9) away from digital switching signals. Use a guard ring around analog inputs to reduce digital crosstalk into ADC readings. The 10-bit ADC requires adequate acquisition time (TACQ) - verify against the datasheet's ADC specification, typically 19.7 us at 40 MHz. Estimated: ADC accuracy degrades if source impedance exceeds 2.5 kOhm without adequate TACQ adjustment.
合規資訊
RoHS and REACH compliant per Microchip product declaration. Not AEC-Q100 qualified (industrial grade -40C to +85C only). Lead-free process per Microchip Pb-free transition.