PIC17LC42A-08I/P - 8-bit 33MHz 4KB OTP MCU, 33 I/O DIP-40
MPN: PIC17LC42A-08I/P ✗ Cuối đờiPIC17LC42A-08I/P Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/EPROM/Flash), data RAM, and peripherals on one die. The PIC17C family is Microchip's original high-performance 8-bit tier above the baseline PIC16C line, introducing a wider 16-bit instruction word, a hardware multiply, and an expanded peripheral set. In the taxonomy of electronic components, the PIC17LC42A sits within microcontrollers -> 8-bit microcontrollers -> PIC microcontrollers -> PIC17C family -> OTP EPROM-based MCUs.
Key features include 58 single-word instructions, single-cycle execution for most instructions (with two-cycle program branches and table reads/writes), an external oscillator interface, an industrial temperature grade (-40C to +85C), and an instruction set optimized for C-language efficiency. The wide 16-bit instruction word enables a single-cycle hardware multiply and a richer addressing mode set compared to PIC16C baseline parts, allowing higher code density and faster arithmetic.
The PIC17LC42A uses a Harvard architecture with separate program and data buses, OTP EPROM program memory, and an external oscillator input. With a 33 MHz clock and 121 ns instruction cycle, it delivers roughly 8 MIPS throughput, and the 33 I/O lines share four 8-bit ports plus a control port for interrupt, timer, and peripheral functions. The architecture supports 16-bit instructions for code efficiency and offers a richer peripheral set than the PIC16C family.
Typical applications include industrial control systems, motor control front-ends, automotive body electronics (legacy), instrumentation, and embedded control subsystems where through-hole PCB construction and a long-lifecycle 8-bit MCU simplify manufacturing. The wide operating voltage and OTP EPROM also make it attractive for prototyping and short-to-medium production runs.
When designing with this device, plan for an external oscillator and verify that the OTP windowless package is appropriate (JW package required for prototype erasing). The through-hole DIP-40 footprint simplifies hand prototyping but consumes significant board area; consider PIC17C42A variants in surface-mount packages for volume production.
This page synthesizes Microchip PIC17C42A datasheet specifications, DigiKey/Mouser distributor pricing, drop-in same-package alternatives from the PIC17C42A family, and practical design notes that complement the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC17LC42A-08I/P — 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 PIC17LC42A-08I/P (cùng hình factor và footprint) — khác nhau ở Package, Core Architecture, Operating Temperature Range, Mounting Type, Maximum Clock Frequency.
PIC17C42A-16/P
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC17C42A-33I/P
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC17C42A-33/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC17C42A-25/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC17C42A-25E/P
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC17C42A-16E/P
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC17LC42A-08I/P Tỷ lệ tối đa & tính chất điện
| Program Memory Size | 4 KB (2K x 16) OTP EPROM |
| RAM Size | 232 x 8 bytes |
| Number of I/O Pins | 33 |
| Tần số xung maksimum | 33 MHz |
| Instruction Cycle | 121 ns |
| Core Architecture | 8-bit RISC, Harvard |
| Instruction Set | 58 single-word instructions |
| Oscillator Type | External |
| Program Memory Technology | OTP EPROM |
| Hộp | 40-PDIP (0.600 in / 15.24 mm) |
| Kiểu lắp đặt | Through-Hole |
| Operating Temperature Grade | Industrial |
| Khoảng nhiệt độ hoạt động | -40C to +85C |
| Số chân | 40 |
| Data EEPROM | None |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC17LC42A-08I/P
| Chân 1 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| Chân 2 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| Chân 3 | RA2/AN2 — Port A bit 2 / Analog input 2 |
| Chân 4 | RA3/AN3 — Port A bit 3 / Analog input 3 |
| Chân 5 | RA4/AN4 — Port A bit 4 / Analog input 4 |
| Chân 6 | RA5/AN5 — Port A bit 5 / Analog input 5 |
| Chân 7 | RA6/AN6 — Port A bit 6 / Analog input 6 |
| Chân 8 | RA7/AN7 — Port A bit 7 / Analog input 7 |
| Chân 9 | RB0/INT — Port B bit 0 / External interrupt |
| Chân 10 | RB1 — Port B bit 1 |
| Chân 11 | RB2 — Port B bit 2 |
| Chân 12 | RB3 — Port B bit 3 |
| Chân 13 | RB4 — Port B bit 4 |
| Chân 14 | RB5 — Port B bit 5 |
| Chân 15 | RB6 — Port B bit 6 |
| Chân 16 | RB7 — Port B bit 7 |
| Chân 17 | VSS — Ground |
| Chân 18 | VDD — Positive supply voltage |
| Chân 19 | OSC1/CLKIN — Oscillator input / clock in |
| Chân 20 | OSC2/CLKOUT — Oscillator output / clock out |
| Chân 21 | RC0/T1OSO — Port C bit 0 / Timer1 oscillator output |
| Chân 22 | RC1/T1OSI — Port C bit 1 / Timer1 oscillator input |
| Chân 23 | RC2/CCP1 — Port C bit 2 / Capture/Compare/PWM 1 |
| Chân 24 | RC3 — Port C bit 3 |
| Chân 25 | RC4 — Port C bit 4 |
| Chân 26 | RC5 — Port C bit 5 |
| Chân 27 | RC6/TX — Port C bit 6 / USART transmit |
| Chân 28 | RC7/RX — Port C bit 7 / USART receive |
| Chân 29 | RD0 — Port D bit 0 |
| Chân 30 | RD1 — Port D bit 1 |
| Chân 31 | RD2 — Port D bit 2 |
| Chân 32 | RD3 — Port D bit 3 |
| Chân 33 | RD4 — Port D bit 4 |
| Chân 34 | RD5 — Port D bit 5 |
| Chân 35 | RD6 — Port D bit 6 |
| Chân 36 | RD7 — Port D bit 7 |
| Chân 37 | RE0/PSP0 — Port E bit 0 / Parallel Slave Port |
| Chân 38 | RE1/PSP1 — Port E bit 1 / Parallel Slave Port |
| Chân 39 | MCLR/VPP — Master clear reset / Programming voltage |
| Chân 40 | VDD — Positive supply voltage (second pin) |
Ứng dụng tiêu biểu
PIC17LC42A-08I/P phù hợp cho 6 Áp dụngs: Industrial Control Systems, Legacy Automotive Body Electronics, Motor Drive Front-End, Instrumentation and Data Acquisition, Embedded Control Subsystems, Prototype and Educational Platforms.
Industrial Control Systems
The PIC17LC42A-08I/P fits legacy industrial control systems where the proven PIC17C instruction set and through-hole 40-pin PDIP simplify field servicing and hand rework. Its 33 MHz clock, 4KB OTP EPROM, and 33 I/O lines deliver enough throughput for relay sequencing, sensor multiplexing, and simple PID loops. Industrial temperature grade (-40C to +85C) tolerates factory floor environments. The OTP EPROM is ideal for fixed-function controllers; for modernizing, migrate to PIC18F or dsPIC33.
Được đề xuất
Legacy Automotive Body Electronics
The PIC17LC42A-08I/P can replace aging PIC17C42A devices in legacy automotive body modules - door locks, seat controllers, wiper logic, and HVAC actuators. Its 33 I/O pins cover the typical signal count for body controllers, and the industrial temperature grade spans the automotive underhood range. The OTP EPROM locks the calibration per vehicle, and the 40-pin PDIP aids service replacement. For new automotive designs, choose AEC-Q100-qualified dsPIC33 or PIC18F-Q1 parts.
Được đề xuất
Motor Drive Front-End
Use PIC17LC42A-08I/P as the control front-end for low-cost brushed DC or stepper motor drives where the MCU generates PWM, monitors current sensors, and runs commutation logic. The 33 I/O lines handle PWM channels, H-bridge enables, encoder inputs, and fault feedback. 4KB OTP holds typical trapezoidal commutation tables and PI controller constants. Migration to DSPIC33EP64MC204 delivers center-aligned PWM and 14-bit ADC at similar cost for new designs.
Được đề xuất
Instrumentation and Data Acquisition
The PIC17LC42A-08I/P supports instrumentation front-ends that multiplex analog sensors, drive LCD or LED displays, and serialize readings over UART/SPI. With 33 I/O pins, the MCU can scan a keypad, drive a character LCD, and stream data via RS-232 without external glue logic. OTP EPROM holds calibration constants, and the 8 MHz clock is adequate for slow multiplexed measurements. Use the PIC18F4550 for USB-equipped modern replacements.
Được đề xuất
Embedded Control Subsystems
Drop the PIC17LC42A-08I/P into embedded subsystems that require deterministic 8-bit control, such as appliance controllers, vending machines, and HVAC damper actuators. Its 58 single-word instructions and 121 ns cycle time deliver predictable latency for real-time loops. The through-hole 40-pin PDIP aids hand-prototype builds and field rework. The DIP-40 footprint and PIC17C instruction set keep firmware portable across PIC17C42A speed grades for volume flexibility.
Được đề xuất
Prototype and Educational Platforms
The PIC17LC42A-08I/P serves educational labs and engineering prototypes where students learn the PIC17C architecture's 16-bit instruction word, hardware multiply, and external oscillator design. Through-hole 40-pin PDIP packages plug into standard breadboards and development boards. Use the JW (windowed) variant of PIC17C42A for erasable prototypes, since the PIC17LC42A-08I/P is OTP and cannot be re-programmed. Migrate to PIC18F or dsPIC33 for modern curricula.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC17LC42A-08I/P — 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 | PIC17C42A-16/P | PIC17C42A-33I/P | PIC17C42A-33/P | PIC17C42A-25/P |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-PDIP (0.600 in) | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same |
| Maximum Clock Frequency | 8 MHz (33 MHz max spec, -08 suffix denotes 8 MHz rating) | 16 MHz | 33 MHz | 33 MHz | 25 MHz |
| Program Memory | 4 KB (2K x 16) OTP EPROM | 4 KB OTP EPROM - same | 4 KB OTP EPROM - same | 4 KB OTP EPROM - same | 4 KB OTP EPROM - same |
| RAM Size | 232 bytes | 232 bytes - same | 232 bytes - same | 232 bytes - same | 232 bytes - same |
| Number of I/O Pins | 33 | 33 - same | 33 - same | 33 - same | 33 - same |
| Operating Temperature Grade | Industrial (-40C to +85C) | Commercial (0 to +70C) | Industrial - same | Commercial | Commercial |
| Voltage Class | LC (low-voltage) variant | Standard 5V | Standard 5V | Standard 5V | Standard 5V |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Bảo phân biệt quan trọng
- Low-voltage (LC) operation versus standard PIC17C42A (vsPIC17C42A-33I/P)
- Industrial temperature grade versus commercial PIC17C42A variants (vsPIC17C42A-33/P)
- Through-hole DIP-40 footprint versus surface-mount PIC17C42A variants (vsPIC17C42A-33I/PT)
Ghi chú thiết kế
The PIC17LC42A-08I/P uses OTP (One-Time-Programmable) EPROM that cannot be erased after programming. Do NOT use this part for prototypes - use the PIC17C42A-16/JW or PIC17C42A-25/JW windowed ceramic package for development, then commit the final code to the OTP PIC17LC42A-08I/P for production. Attempting to re-program the OTP device will destroy the existing code with no recovery.
The PIC17LC42A (low-voltage 'LC' variant) requires careful decoupling - place a 0.1 uF ceramic capacitor directly across VDD and VSS pins (pins 18 and 17), as close to the package as possible. Add a bulk 10 uF tantalum or electrolytic capacitor at the board power entry. Brown-out detection should be enabled via configuration bits to prevent code corruption during supply droop, which can latch up the EPROM control logic and require a full power cycle.
The 40-pin PDIP footprint (0.600 in / 15.24 mm row spacing) simplifies through-hole prototyping but consumes significant board area versus surface-mount alternatives. For production volume, migrate to the PIC17C42A-33/PT (44-TQFP) variant. Layout the MCLR/VPP pin (pin 39) with a 10 kohm pull-up to VDD and a 100 nF cap to ground for clean reset behavior. Place the oscillator (pins 19/20) traces short and shield from switching signals.
PIC17C family oscillator design is sensitive to parasitic capacitance - keep the crystal or ceramic resonator traces (OSC1/OSC2, pins 19 and 20) within 0.5 inch of the package and surround them with a ground pour. For an external CMOS clock input, drive OSC1 directly and leave OSC2 floating per Microchip AN588. Add a series resistor on MCLR if the reset line is long to limit inrush current on power-up.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - this is a legacy industrial-grade part, not automotive. For automotive, choose PIC18F-Q1 or dsPIC33 AEC-Q100 qualified variants.
