PIC18C442-E/P - 8-bit 40MHz 16KB OTP MCU | Microchip 40-DIP
MPN： PIC18C442-E/P ✗ 停產PIC18C442-E/P 概覽
As a member of the PIC18C family, this device sits in the broader 8-bit MCU taxonomy: microcontroller -> embedded controller -> PIC microcontroller -> PIC18C series. PIC18C parts introduced the enhanced PIC18 instruction set with 16-bit wide instructions and an 8-bit wide data path, 77 single-word instructions, a hardware single-cycle 8x8 multiplier, and a vectored interrupt controller with multiple priority levels, superseding the earlier PIC16C/PIC17C families while remaining source-code compatible at the architectural level.
Key features include a 10-bit analog-to-digital converter (ADC) with up to 8 input channels, three external hardware interrupt sources, a USART/SCI port, a master/slave SPI port, and a master I2C port. Capture/Compare/PWM (CCP) modules support timing and motor-control applications. The -E suffix denotes the extended industrial temperature grade of -40C to +125C. The external oscillator interface accepts a 4-10 MHz crystal or a 40 MHz clock input directly.
Architecturally, the PIC18C442 implements a Harvard-style CPU with separate program and data buses, a 31-level hardware stack, and a programming model compatible with PIC16 mid-range parts. The OTP program memory is windowless, requiring no UV erase, simplifying manufacturing flow but removing field-upgrade capability. Designers upgrading to a flash-based equivalent should consider the PIC18F442 as the recommended migration path.
Typical applications include industrial control panels, automotive body electronics, consumer appliances, HVAC thermostats, and general-purpose embedded designs that benefit from the 40-pin DIP form factor for prototype and through-hole assembly. The wide temperature range also makes it suitable for outdoor and automotive environments.
When designing with this part, ensure the power supply decoupling follows Microchip's recommended layout: 0.1 uF ceramic capacitors placed within 5 mm of each VDD/VSS pair, plus a 10 uF bulk capacitor on the main rail. The MCLR pin must use the recommended RC reset network (typically 10 kohm pull-up to VDD with a 0.1 uF to ground) to guarantee a clean POR.
This page synthesizes distributor pricing, drop-in PIC18C/PIC18F alternatives, and practical design notes not found in the manufacturer datasheet. Pricing and inventory are quoted as of 2026-09-26.
直接替換替代品，適用於 PIC18C442-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： PIC18C442-E/P （相同外形與佔位） — 差異在於 Operating Temperature, Package, ADC, Mounting Type, Core.
PIC18F442-I/P
✅ 直接替換聯絡詢價
查看資料表 →PIC18F452-I/P
✅ 直接替換聯絡詢價
查看資料表 →PIC18C452-E/P
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18F2520-I/SP
✅ 直接替換聯絡詢價
查看資料表 →PIC18F2550-I/SP
✅ 直接替換聯絡詢價
查看資料表 →PIC18C442-E/P 最大額定值與電氣特性
| Core Architecture | PIC18C (8-bit Harvard) |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 16 KB (8K x 16) |
| RAM Size | 512 bytes |
| Maximum CPU Frequency | 40 MHz |
| Throughput | 10 MIPS |
| Instruction Set Width | 16-bit instructions, 8-bit data path |
| Number of I/O Pins | 33 |
| ADC | 10-bit, up to 8 channels |
| Operating Voltage | 4.2 V to 5.5 V |
| Oscillator Type | External |
| 封裝 | 40-pin PDIP (0.600" / 15.24 mm) |
| 安裝類型 | Through-Hole |
| 工作溫度 | -40 C to +125 C (Extended, -E grade) |
| Peripherals | USART, SPI (master/slave), I2C (master), CCP, 10-bit ADC |
| Interrupt Priority Levels | Yes (high/low) |
| Hardware Multiplier | 8x8 single-cycle |
| Recommended Replacement | PIC18F442 (flash-based, pin-compatible) |
PIC18C442-E/P 腳位配置
| 腳位 1 | MCLR — Master Clear (Reset) input, active-low |
| 腳位 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| 腳位 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| 腳位 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / ADC VREF- |
| 腳位 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC VREF+ |
| 腳位 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| 腳位 7 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI slave select |
| 腳位 8 | OSC1/CLKIN — Oscillator crystal input / external clock in |
| 腳位 9 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| 腳位 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock in |
| 腳位 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| 腳位 12 | RC2/CCP1 — PORTC bit 2 / CCP1 output |
| 腳位 13 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| 腳位 14 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| 腳位 15 | RC5/SDO — PORTC bit 5 / SPI data out |
| 腳位 16 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| 腳位 17 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| 腳位 18 | VSS — Ground reference |
| 腳位 19 | VDD — Positive supply voltage (4.2 V to 5.5 V) |
| 腳位 20 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| 腳位 21 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| 腳位 22 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| 腳位 23 | RB3/CCP2 — PORTB bit 3 / CCP2 alternate pin |
| 腳位 24 | RB4 — PORTB bit 4 (interrupt-on-change) |
| 腳位 25 | RB5 — PORTB bit 5 (interrupt-on-change) |
| 腳位 26 | RB6/PGC — PORTB bit 6 / ICSP clock (programming) |
| 腳位 27 | RB7/PGD — PORTB bit 7 / ICSP data (programming) |
| 腳位 28 | NC — Not connected (per datasheet) |
| 腳位 29 | RD0/PSP0 — PORTD bit 0 / parallel slave port bit 0 |
| 腳位 30 | RD1/PSP1 — PORTD bit 1 / parallel slave port bit 1 |
| 腳位 31 | RD2/PSP2 — PORTD bit 2 / parallel slave port bit 2 |
| 腳位 32 | RD3/PSP3 — PORTD bit 3 / parallel slave port bit 3 |
| 腳位 33 | RD4/PSP4 — PORTD bit 4 / parallel slave port bit 4 |
| 腳位 34 | RD5/PSP5 — PORTD bit 5 / parallel slave port bit 5 |
| 腳位 35 | RD6/PSP6 — PORTD bit 6 / parallel slave port bit 6 |
| 腳位 36 | RD7/PSP7 — PORTD bit 7 / parallel slave port bit 7 |
| 腳位 37 | VSS — Ground reference |
| 腳位 38 | VDD — Positive supply voltage (4.2 V to 5.5 V) |
| 腳位 39 | RE0/RD — PORTE bit 0 / parallel slave port read control |
| 腳位 40 | RE1/WR — PORTE bit 1 / parallel slave port write control |
典型應用
PIC18C442-E/P 適用於 6 應用s: Industrial Control Panels, Automotive Body Electronics, HVAC Thermostat Controllers, Consumer Appliance Control, General-Purpose Embedded Prototyping, Data Acquisition Front Ends.
Industrial Control Panels
The PIC18C442-E/P's 33 digital I/O pins and 10 MIPS throughput make it well-suited for industrial control panels that scan keypads, drive indicator LEDs, and interface to optoisolated inputs. Its 10-bit ADC with up to 8 channels reads analog setpoints from potentiometers and 4-20 mA loop transducers with sufficient resolution for most process-control loops. The extended -40 C to +125 C temperature grade supports deployment in factory-floor enclosures, while the 40-pin PDIP package simplifies through-hole assembly for low-volume industrial products. Engineers commonly pair it with character LCDs, EEPROM data logs, and RS-485 transceivers for SCADA nodes.
推薦
Automotive Body Electronics
The PIC18C442-E/P's extended temperature range (-40 C to +125 C), external oscillator robustness, and 16 KB OTP program memory suit automotive body modules such as central-locking controllers, mirror-adjust units, and HVAC damper actuators. Its CCP modules generate PWM signals for driving small DC motors and solenoids directly through FET drivers, while the hardware 8x8 multiplier accelerates sensor-scaling math. OTP memory suits fixed-function automotive ECUs that ship with calibration data burned in at production. For new automotive designs, Microchip recommends the AEC-Q100-qualified PIC18F442 family successors.
推薦
HVAC Thermostat Controllers
The PIC18C442-E/P delivers the I/O count, ADC resolution, and temperature tolerance needed for residential and commercial HVAC thermostat controllers. Its 10-bit ADC reads thermistor temperature sensors with better than 0.5 C resolution across a 0-50 C range, while PWM outputs drive TRIAC-controlled furnace blowers and compressor relays. The 16 KB OTP program memory holds fixed temperature-control algorithms, scheduling tables, and user-interface state machines. Extended temperature operation ensures reliable performance near heating vents and in unconditioned equipment closets. The 40-pin PDIP footprint also suits hand-soldered prototype thermostats.
推薦
Consumer Appliance Control
White-goods appliances such as washing machines, dishwashers, and microwave ovens benefit from the PIC18C442-E/P's combination of 33 I/O pins, hardware PWM, and extended-temperature operation. The USART allows firmware download via diagnostic ports in service centers, while the I2C bus drives character LCD displays and user-interface keypads. OTP memory prevents accidental firmware tampering in production-line appliances. The 10 MIPS throughput handles real-time motor-control loops and user-interface refresh concurrently. For high-volume appliances, Microchip's PIC18F successors in equivalent packages are recommended to enable in-field firmware updates.
推薦
General-Purpose Embedded Prototyping
The PIC18C442-E/P's 40-pin PDIP through-hole package is popular in university embedded-systems curricula and hobbyist prototyping because it fits standard 0.1" pitch breadboards and ZIF sockets, allowing the part to be reprogrammed (in the OTP variant, swapped out) repeatedly during development. With 16 KB of program memory, 512 bytes of RAM, and 10 MIPS throughput, students implement real-time schedulers, sensor-fusion routines, and communication stacks without external memory. The PIC18C enhanced instruction set introduces hardware multiply and priority interrupts that prepare students for advanced 32-bit ARM Cortex-M designs.
推薦
Data Acquisition Front Ends
Multi-channel data acquisition systems use the PIC18C442-E/P as a low-cost front-end controller that sequences analog multiplexer channels into its 10-bit ADC, timestamps samples using CCP capture, and streams data over USART to a host PC or external logger. With 40 MHz operation, the part can sample and process analog signals at several kSPS aggregate rates while still servicing the serial port. The extended temperature range supports deployment in outdoor or vehicular data loggers. OTP memory secures the firmware against accidental field reprogramming in instrumentation applications.
推薦
推薦產品摘要
工程參考資料，適用於 PIC18C442-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 | PIC18F442-I/P | PIC18F452-I/P | PIC18C452-E/P | PIC18F2520-I/SP | PIC18F2550-I/SP |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-pin PDIP (0.600") | 40-pin PDIP (same) | 40-pin PDIP (same) | 40-pin PDIP (same) | 28-pin SPDIP (different pin count) | 28-pin SPDIP (different pin count) |
| Program Memory | 16 KB OTP | 16 KB Flash | 32 KB Flash | 32 KB OTP | 32 KB Flash | 32 KB Flash |
| RAM Size | 512 bytes | 512 bytes | 512 bytes | 512 bytes | 1.5 KB | 2 KB |
| Maximum Frequency | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 48 MHz (12 MIPS) |
| ADC | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 10 channels |
| USB | None | None | None | None | None | USB 2.0 FS |
| Memory Type | OTP | Flash | Flash | OTP | Flash | Flash |
| I/O Pins | 33 | 33 | 33 | 33 | 23 | 24 |
主要差異化特點
- Industry-standard PIC18C core with extensive third-party toolchain support (對比PIC16F877A-I/P (legacy 14-bit PIC16 core))
- OTP memory for tamper-resistant production firmware (對比PIC18F442-I/P (flash successor))
- Extended -40 C to +125 C temperature grade standard (對比PIC16F877A-I/P (commercial 0 C to +70 C))
設計說明
Place a 0.1 uF ceramic decoupling capacitor within 5 mm of every VDD/VSS pair on the PIC18C442-E/P. Add a single 10 uF bulk tantalum or aluminum electrolytic capacitor on the main 5 V rail. For mixed-signal designs, separate AVdd/AVss from digital Vdd/Vss and join them at a single point under the MCU to prevent ADC noise coupling. The ADC reference pin (RA3/VREF+) requires a low-impedance 5 V source - a 10 uF + 0.1 uF local bypass is mandatory for ADC accuracy.
Keep the crystal/oscillator traces between OSC1 and OSC2 short and symmetric (within 5 mm). Surround the crystal body with a ground guard ring connected to VSS at one point. For ADC accuracy, route analog inputs (RA0-RA5) away from digital switching signals (RB, RC, RD ports). When using the parallel slave port (PORTD/PORTE), add 100 ohm series resistors on PSP data lines to limit ringing on long traces to external bus devices.
Do not leave the MCLR pin floating - use a 10 kohm pull-up to VDD and a 0.1 uF capacitor to ground for the standard Microchip reset network. Floating MCLR causes spurious resets. Note that the PIC18C442 uses OTP memory - firmware bugs cannot be patched in-circuit; budget for one or two PIC18F442 prototypes during development and switch to PIC18C442 only for production. Configuration bits must be set explicitly; an unconfigured part defaults to a watchdog-enabled state that locks the CPU if not cleared in code within 18 ms.
The I2C port on PIC18C442 is master-only (no slave mode) per the datasheet - do not attempt to use it as an I2C slave. For SPI, ensure the SCK idle/active polarity matches the slave device - the PIC18C SPI defaults to clock idle low, active high (CKE=1, CKP=0). When driving long cables from the USART, add a 100 ohm series resistor at the TX pin and a small RC filter (1 kohm + 100 pF) on RX to suppress EMI ringing.
合規資訊
RoHS and lead-free status marked unknown because the verified web data does not explicitly state compliance. The PIC18C442-E/P is NOT AEC-Q100 qualified (PIC18F family variants with -Q1 suffix are AEC-Q100). Lifecycle status: NRND (Not Recommended for New Designs) per Microchip product page.
