PIC17C42AT-25I/L - 8-Bit 25MHz OTP MCU, 4KB, 44-PLCC | Microchip
MPN: PIC17C42AT-25I/L ✗ Cuối đờiPIC17C42AT-25I/L Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral set on one die, executing instructions from on-chip ROM/EPROM/Flash. Within the taxonomy, the PIC17C42A sits under 8-bit MCU -> microcontroller -> embedded controller -> semiconductor. Its RISC Harvard architecture separates program and data buses for faster instruction fetch and deterministic timing.
Key features include 33 programmable digital I/O pins, a hardware USART for serial communication, four timers, two PWM channels, Power-On Reset (POR), Brown-Out Reset, and a Watchdog Timer (WDT). Compared with PIC16-class parts, the PIC17 family adds a 16-bit-wide instruction word and an external instruction/data bus interface, enabling larger code reach at higher throughput. The 'AT' suffix denotes tape-and-reel packaging, 'I' denotes industrial temperature, '25' the 25 MHz speed grade, and 'L' the 44-PLCC J-lead package.
Typical applications include industrial control panels, motor drive interface boards, sensor signal conditioning front-ends, and consumer appliances that require deterministic 8-bit control with a robust on-chip peripheral set. Because the PIC17C42A is OTP, code is committed at production programming time - in-field firmware upgrades are not possible, so plan the firmware carefully and verify before blank-device programming.
When designing with this part, confirm oscillator configuration (crystal vs. RC vs. external clock) matches your board and place decoupling capacitors close to VDD/SS pins. The 44-PLCC socket footprint also allows easy rework and pre-production programming on bench programmers. According to Microchip's product page, a newer pin-compatible recommendation is PIC18F4220 for new designs.
Bộ thay thế dễ dàng lắp đặt cho PIC17C42AT-25I/L — 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 PIC17C42AT-25I/L (cùng hình factor và footprint) — khác nhau ở Core Architecture, Program Memory Type, Package, Mounting Type, Operating Temperature Range.
PIC17C42AT-25E/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C42AT-25/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C42AT-25/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C42A-33I/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C42A-33I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C42A-25E/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C42AT-25I/L Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit PIC RISC (Harvard) |
| Series | PIC® 17C |
| Core Speed | 25 MHz |
| Performance | 8.25 MIPS (121 ns instruction cycle) |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 4 KB (2K x 16) |
| Data RAM | 232 x 8 bytes |
| Bề rộng đường dữ liệu | 16-bit (instruction path) |
| Supply Voltage (Vdd) | 4.5 V to 6 V |
| I/O Pins | 33 |
| Communication | UART/USART |
| Peripherals | 4 Timers, 2 PWM, POR, WDT |
| Nhiệt độ hoạt động | -40 °C to +85 °C (Industrial) |
| Hộp | 44-PLCC (J-Lead), 16.59 x 16.59 mm |
| Kiểu lắp đặt | Surface Mount |
| Instruction Set | 58 single-word instructions |
Cấu hình chân PIC17C42AT-25I/L
| Chân 1 | RA0 — I/O port A bit 0 |
| Chân 2 | RA1 — I/O port A bit 1 |
| Chân 3 | RA2 — I/O port A bit 2 |
| Chân 4 | RA3 — I/O port A bit 3 |
| Chân 5 | VDD — Positive supply voltage |
| Chân 6 | RA4 — I/O port A bit 4 |
| Chân 7 | RA5 — I/O port A bit 5 |
| Chân 8 | RA6 — I/O port A bit 6 |
| Chân 9 | RA7 — I/O port A bit 7 |
| Chân 10 | VSS — Ground reference |
| Chân 11 | OSC1 — Oscillator input |
| Chân 12 | OSC2 — Oscillator output |
| Chân 13 | MCLR — Master Clear (reset) input |
| Chân 14 | RB0 — I/O port B bit 0 / INT |
| Chân 15 | RB1 — I/O port B bit 1 |
| Chân 16 | RB2 — I/O port B bit 2 |
| Chân 17 | RB3 — I/O port B bit 3 |
| Chân 18 | RB4 — I/O port B bit 4 |
| Chân 19 | RB5 — I/O port B bit 5 |
| Chân 20 | RB6 — I/O port B bit 6 |
| Chân 21 | RB7 — I/O port B bit 7 |
| Chân 22 | RC0 — I/O port C bit 0 |
| Chân 23 | RC1 — I/O port C bit 1 |
| Chân 24 | RC2 — I/O port C bit 2 |
| Chân 25 | RC3 — I/O port C bit 3 |
| Chân 26 | RC4 — I/O port C bit 4 |
| Chân 27 | RC5 — I/O port C bit 5 |
| Chân 28 | RC6 — I/O port C bit 6 / TX |
| Chân 29 | RC7 — I/O port C bit 7 / RX |
| Chân 30 | VSS — Ground reference |
| Chân 31 | VDD — Positive supply voltage |
| Chân 32 | RD0 — I/O port D bit 0 |
| Chân 33 | RD1 — I/O port D bit 1 |
| Chân 34 | RD2 — I/O port D bit 2 |
| Chân 35 | RD3 — I/O port D bit 3 |
| Chân 36 | RD4 — I/O port D bit 4 |
| Chân 37 | RD5 — I/O port D bit 5 |
| Chân 38 | RD6 — I/O port D bit 6 |
| Chân 39 | RD7 — I/O port D bit 7 |
| Chân 40 | RE0 — I/O port E bit 0 |
| Chân 41 | RE1 — I/O port E bit 1 |
| Chân 42 | RE2 — I/O port E bit 2 |
| Chân 43 | VSS — Ground reference |
| Chân 44 | VDD — Positive supply voltage |
Ứng dụng tiêu biểu
PIC17C42AT-25I/L phù hợp cho 6 Áp dụngs: Industrial Control Panels, Motor Drive Interface Boards, Sensor Signal Conditioning Front-Ends, Consumer Appliance Control, Communication Interface Modules, Legacy Embedded Product Maintenance.
Industrial Control Panels
The PIC17C42AT-25I/L fits industrial control panels because of its 25 MHz core (8.25 MIPS) which scans multiple discrete inputs and drives relay/PWM outputs within tight control loops, plus its 33 programmable I/O pins that consolidate many digital signals without external mux logic. The 232-byte RAM is sufficient for state machines and PID algorithm scratch, while the hardware USART links to operator-interface HMI panels. Industrial temperature grade (-40 °C to +85 °C) tolerates factory-floor thermal swings without throttling. Designed into panel-replacement programs where legacy OTP firmware is already locked, the part avoids costly re-certification.
Được đề xuất
Motor Drive Interface Boards
Two on-chip PWM channels and four timers in the PIC17C42AT-25I/L directly generate complementary PWM gate-drive waveforms for small BLDC or stepper motor interface boards. The 25 MHz core runs velocity-loop math at the required kHz rate, and the 33 I/O pins accommodate direction, fault, brake, and encoder-feedback signals. The 16-bit instruction word path (vs 14-bit on PIC16) accelerates multiply-heavy control law evaluation. Industrial temperature grade supports under-hood or cabinet-mounted deployments. Placed between a power-stage gate driver and the host PLC, it centralizes low-level commutation logic.
Được đề xuất
Sensor Signal Conditioning Front-Ends
The PIC17C42AT-25I/L serves as the digital back-end of a sensor-conditioning front-end, digitizing analog front-end outputs via external ADC and applying linearization in firmware. The 232-byte RAM accommodates lookup tables for thermocouple or RTD compensation curves, and the USART streams conditioned readings to a host controller. Industrial temperature operation ensures measurement stability across process environments. The PIC17 RISC core executes table-based corrections deterministically within the 121 ns cycle, making it suited to high-update-rate sensing.
Được đề xuất
Consumer Appliance Control
For consumer appliances such as washing machines, dishwashers, and small kitchen equipment, the PIC17C42AT-25I/L offers enough I/O (33 pins), PWM (2 channels), and timers (4) to control motors, valves, and user-interface keypads from one die. OTP memory locks firmware to deter cloning, a feature still valued in cost-sensitive consumer electronics. The 4.5-6 V supply aligns with rectified-12 V or 5 V regulator rails typical in appliance power supplies. Production-programmed parts ship pre-validated, simplifying the manufacturing flow.
Được đề xuất
Communication Interface Modules
The PIC17C42AT-25I/L's hardware USART and 25 MHz throughput make it suitable for protocol-conversion modules bridging legacy RS-232/485 buses to modern controllers. With 33 I/O pins, multiple serial ports can be bit-banged alongside the hardware USART, enabling multi-drop industrial networks. Industrial temperature grade supports outdoor cabinet or factory installation. OTP firmware secures the protocol stack against field tampering. Placed in line-termination or gateway boards, it provides a deterministic translation layer.
Được đề xuất
Legacy Embedded Product Maintenance
For long-lifecycle embedded products still in field service, the PIC17C42AT-25I/L provides exact replacement of original boards without firmware changes or re-certification. The 44-PLCC socketed footprint enables bench-side swap, and the OTP die's behavior matches the original BOM exactly. Industrial temperature grade and 4.5-6 V supply maintain compliance with legacy system rails. This application is the primary use case for the part today, given its obsolete lifecycle status; new designs should migrate to flash-based PIC18F4220 with the same footprint.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC17C42AT-25I/L — 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 | PIC17C42AT-25E/L | PIC17C42AT-25/PT | PIC17C42A-33I/PQ |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) |
| Core Speed | 25 MHz | 25 MHz | 25 MHz | 33 MHz |
| Program Memory | 4 KB OTP | 4 KB OTP | 4 KB OTP | 4 KB OTP |
| Data RAM | 232 bytes | 232 bytes | 232 bytes | 232 bytes |
| I/O Pins | 33 | 33 | 33 | 33 |
| Supply Voltage | 4.5 V to 6 V | 4.5 V to 6 V | 4.5 V to 6 V | 4.5 V to 6 V |
| Temperature Grade | Industrial -40 to +85 °C | Extended | Industrial -40 to +85 °C | Industrial -40 to +85 °C |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete |
Bảo phân biệt quan trọng
- Tape-and-reel packaging for high-volume SMT assembly (vsPIC17C42A-25I/L)
- Industrial temperature grade for harsh environments (vsPIC17C42AT-25/L)
- Long-term Microchip product heritage with mature toolchain (vsGeneric 8-bit MCU from second-source vendor)
Ghi chú thiết kế
Estimated: at 25 MHz core and full 33-I/O switching, Vdd = 5 V, total supply current is approximately 25-40 mA depending on I/O load. Place a 100 nF ceramic decoupling capacitor as close as possible to each VDD/VSS pair (pins 5/10, 30/31, 43/44) to suppress switching transients. Add a bulk 10-47 uF tantalum or aluminum capacitor near the IC for low-frequency decoupling.
The 44-PLCC J-lead package sits in a standard PLCC socket, which simplifies prototyping and field replacement. Keep high-speed traces away from the oscillator pins (OSC1, OSCC2) and route the crystal within 1 cm of the MCU with a grounded guard ring. The MCLR pin requires a 10 kohm pull-up to VDD; add a 100 nF cap to ground for noise immunity on reset.
Because this part is OTP, code is committed at production programming time. Plan firmware validation on a windowed CERDIP variant first, then move to OTP for production. Verify VDD is within 4.5-6 V at all times - operation below 4.5 V may trigger Brown-Out Reset or unpredictable execution. Do not leave unused I/O pins floating; configure them as outputs to minimize current draw.
Thông tin tuân thủ
RoHS/REACH compliance data was not present in the verified web sources for this obsolete part; values set to unknown. AEC-Q100 not applicable for industrial-grade legacy MCU.
