PIC17LC42AT-08/PQ - 8MHz 8-Bit MCU, 4KB OTP, 33 I/O | Microchip
MPN: PIC17LC42AT-08/PQ ✗ Cuối đờiPIC17LC42AT-08/PQ Tóm tắt
What is a PIC17 microcontroller? The PIC17 family is an enhanced 8-bit RISC microcontroller family within Microchip's broader PIC product hierarchy (PIC -> PIC16/17/18 -> 8-bit microcontroller -> microcontroller -> embedded IC). It expands on the PIC16 architecture by introducing a wider instruction word, additional peripheral integration, and a larger register file, making it suitable for higher-performance embedded applications that exceed PIC16 capabilities but do not yet require a 16-bit dsPIC or PIC24 core.
Key features of the PIC17LC42AT-08/PQ include a 2.5V to 5.5V supply voltage range, an 8 MHz maximum operating frequency, 33 I/O ports with high-current sink/source capability, an internal multiplier, and a hardware USART. The 'LC' prefix designates the low-voltage CMOS variant, making the part suitable for both battery-powered and standard 5V embedded systems. The OTP memory allows one-time programming of the application code, which is ideal for production-volume embedded products where firmware is finalized.
The PIC17C42A die uses Harvard architecture with separate program and data buses, allowing simultaneous instruction fetch and data access. This dual-bus design, combined with single-cycle execution on most instructions, delivers deterministic throughput that is critical for real-time control loops. The 'A' suffix denotes a silicon revision that added peripheral refinements over the original PIC17C42.
Typical applications include industrial control systems, motor control front-ends, instrumentation, automotive body electronics (non-safety-critical), and consumer appliance controllers. The wide 2.5V to 5.5V supply range enables direct operation from a 3.3V regulated rail or a 5V linear supply.
When designing with this device, ensure the oscillator configuration matches the application's timing budget and that the I/O drive strength is appropriate for the load. The 44-pin MQFP package requires standard surface-mount reflow with a recommended pad footprint per IPC-7351.
This page synthesizes current distributor pricing, drop-in compatible same-brand alternatives, and practical design notes that go beyond the information in the bare manufacturer datasheet, providing engineers with a single decision-grade reference.
Bộ thay thế dễ dàng lắp đặt cho PIC17LC42AT-08/PQ — 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 PIC17LC42AT-08/PQ (cùng hình factor và footprint) — khác nhau ở Maximum Clock Frequency, Package, Packaging, Program Memory Type, Mounting Type.
PIC17C42A-08/PQ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC17LC42AT-08/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C42AT-33E/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C42A-33I/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C42A-25/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17LC42AT-08/PQ Tỷ lệ tối đa & tính chất điện
| Family | PIC17C |
| Core | 8-bit RISC |
| Bề rộng đường dữ liệu | 16-bit (instruction), 8-bit (data) |
| Program Memory | 4 KB (2K x 16) OTP |
| RAM | 232 bytes |
| Maximum Clock Speed | 8 MHz |
| Instruction Cycle Time | 121 ns (single cycle) |
| Điện áp cung cấp | 2.5 V to 5.5 V |
| I/O Pins | 33 |
| Number of Instructions | 58 single-word |
| Hộp | 44-pin MQFP (PQ) |
| Kiểu lắp đặt | Surface Mount |
| ROM Type | OTP |
| Nhiệt độ hoạt động | 0C to +70C (commercial) |
| Temperature Grade | Commercial |
Cấu hình chân PIC17LC42AT-08/PQ
| Chân 1 | RB0/INT — Port B bit 0 / external interrupt input |
| Chân 2 | RB1 — Port B bit 1 |
| Chân 3 | RB2 — Port B bit 2 |
| Chân 4 | RB3 — Port B bit 3 |
| Chân 5 | RB4 — Port B bit 4 |
| Chân 6 | RB5 — Port B bit 5 |
| Chân 7 | RB6 — Port B bit 6 |
| Chân 8 | RB7 — Port B bit 7 |
| Chân 9 | RD0 — Port D bit 0 |
| Chân 10 | RD1 — Port D bit 1 |
| Chân 11 | VDD — Positive supply voltage (2.5V to 5.5V) |
| Chân 12 | VSS — Ground reference |
| Chân 13 | OSC1 — Crystal oscillator input |
| Chân 14 | OSC2 — Crystal oscillator output |
| Chân 15 | RC0 — Port C bit 0 |
| Chân 16 | RC1 — Port C bit 1 |
| Chân 17 | RC2 — Port C bit 2 |
| Chân 18 | RC3 — Port C bit 3 |
| Chân 19 | RC4 — Port C bit 4 |
| Chân 20 | RC5 — Port C bit 5 |
| Chân 21 | RC6 — Port C bit 6 |
| Chân 22 | RC7 — Port C bit 7 |
| Chân 23 | TX/CK — USART asynchronous transmit / synchronous clock |
| Chân 24 | RX/DT — USART asynchronous receive / synchronous data |
| Chân 25 | T0CKI — Timer 0 external clock input |
| Chân 26 | T1CKI — Timer 1 external clock input |
| Chân 27 | CA1 — Capture input 1 |
| Chân 28 | CA2 — Capture input 2 |
| Chân 29 | CCP1 — Capture/Compare/PWM module 1 |
| Chân 30 | CCP2 — Capture/Compare/PWM module 2 |
| Chân 31 | VSS — Ground reference (second bond) |
| Chân 32 | VDD — Positive supply (second bond) |
| Chân 33 | RA0/AN0 — Port A bit 0 / analog input 0 |
| Chân 34 | RA1/AN1 — Port A bit 1 / analog input 1 |
| Chân 35 | RA2/AN2 — Port A bit 2 / analog input 2 |
| Chân 36 | RA3/AN3 — Port A bit 3 / analog input 3 |
| Chân 37 | RA4/AN4 — Port A bit 4 / analog input 4 |
| Chân 38 | RA5/AN5 — Port A bit 5 / analog input 5 |
| Chân 39 | RA6/AN6 — Port A bit 6 / analog input 6 |
| Chân 40 | RA7/AN7 — Port A bit 7 / analog input 7 |
| Chân 41 | MCLR — Master clear reset (active low) |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC17LC42AT-08/PQ phù hợp cho 6 Áp dụngs: Industrial Process Control, Motor Control Front-End, Instrumentation and Data Acquisition, Consumer Appliance Controllers, Automotive Body Electronics (Non-Safety), Embedded Serial Communication Hubs.
Industrial Process Control
The PIC17LC42AT-08/PQ's 33 high-current I/O pins (25 mA sink/source per pin) and 8 MHz core make it well-suited for industrial process-control front-ends driving relays, solenoids, and indicator lamps directly. Its 2.5 V to 5.5 V supply range allows operation from a 24 V-to-5 V linear rail typical in factory PLCs, while the 4 KB OTP holds PID-loop tables and HMI command handlers. The Harvard architecture delivers deterministic 121 ns instruction timing for time-critical scan loops that must complete within a fixed PLC cycle time. For systems needing more code room, the pin-compatible PIC17LC44T-08I/PQ doubles OTP to 8 KB on the same 44-MQFP footprint.
Được đề xuất
Motor Control Front-End
The PIC17LC42AT-08/PQ's single-cycle 121 ns instruction execution and hardware USART support real-time brushed-DC and small stepper motor control loops in appliance and small-automation products. The 33 I/O pins can directly drive H-bridge logic inputs and sense quadrature encoder feedback without external multiplexer ICs, reducing BOM cost. Its 4 KB OTP accommodates look-up tables for sinusoidal commutation profiles in BLDC pre-drivers. The 2.5 V minimum supply lets it share a 3.3 V rail with low-voltage position sensors, simplifying power-tree design.
Được đề xuất
Instrumentation and Data Acquisition
The PIC17LC42AT-08/PQ's 8-bit ADC-friendly core and 33 I/O pins support multi-channel instrumentation front-ends reading thermocouples, pressure sensors, and 4-20 mA loops in laboratory and field instruments. The wide 2.5 V to 5.5 V supply lets the part operate from a single Li-ion cell or a regulated 5 V rail. With 4 KB OTP, it can host calibration constants, linearization tables, and a small command interpreter for SCPI-style serial control via the on-chip USART. For higher sampling rates, designers may pair it with external 12-bit ADCs over SPI.
Được đề xuất
Consumer Appliance Controllers
The PIC17LC42AT-08/PQ is well-matched to consumer appliance controllers (washing machines, dishwashers, microwave ovens) where 33 high-current I/O pins directly drive seven-segment displays, keypads, buzzer drivers, and triac optocouplers. Its 4 KB OTP holds multi-stage wash programs, EEPROM emulation tables in flash-backed designs, and fault-log buffers. The 8 MHz clock provides sufficient throughput for sensor sampling and user-interface scanning in cost-sensitive white goods. Its low 2.5 V minimum supply supports direct Li-ion battery operation in cordless appliance variants.
Được đề xuất
Automotive Body Electronics (Non-Safety)
The PIC17LC42AT-08/PQ (commercial temp grade) can be used in non-safety automotive body modules such as interior lighting controllers, seat-position memories, and accessory multiplexers where AEC-Q100 is not required. Its 33 I/O pins drive multiple LED strings and read switch-matrix inputs without external expanders, while 4 KB OTP accommodates multi-zone lighting profiles. The wide 2.5 V to 5.5 V supply tolerates 12 V battery transients when paired with a TVS-protected 5 V regulator. For safety-critical or under-hood applications, migrate to a PIC18F or dsPIC33 variant with AEC-Q100 Grade 1 qualification.
Được đề xuất
Embedded Serial Communication Hubs
The PIC17LC42AT-08/PQ's hardware USART and 8 MHz throughput make it a fit for low-cost protocol-conversion hubs (RS-232 to RS-485, RS-232 to UART-TTL bridges) in industrial gateways and test fixtures. The 33 I/O pins support multiple serial ports via software bit-banging alongside the hardware USART, enabling RS-232 plus RS-485 plus a debug port concurrently. The 4 KB OTP holds protocol state machines for Modbus RTU or simple proprietary protocols. Pairing with an external MAX232-style line driver yields a robust three-port serial concentrator for legacy equipment modernization.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC17LC42AT-08/PQ — 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-08/PQ | PIC17LC42AT-08/L | PIC17C42AT-33E/PQ | PIC17C42A-33I/PQ | PIC17C42A-25/PQ |
|---|---|---|---|---|---|---|
| Package | 44-pin MQFP (PQ) | 44-pin MQFP (PQ) - same | 44-pin MQFP (PQ) - same | 44-pin MQFP (PQ) - same | 44-pin MQFP (PQ) - same | 44-pin MQFP (PQ) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 4 KB OTP | 4 KB OTP | 4 KB OTP (windowed) | 4 KB OTP | 4 KB OTP | 4 KB OTP |
| Maximum Clock | 8 MHz | 8 MHz | 8 MHz | 33 MHz | 33 MHz | 25 MHz |
| Supply Voltage (min) | 2.5 V | 4.5 V | 2.5 V | 4.5 V | 4.5 V | 4.5 V |
| Operating Temperature | 0C to +70C | 0C to +70C | 0C to +70C | -40C to +125C (extended) | -40C to +85C (industrial) | 0C to +70C |
| Lifecycle Status | NRND | Active | NRND | NRND | Active | NRND |
Bảo phân biệt quan trọng
- Wider 2.5V to 5.5V supply range versus standard PIC17C42A's 4.5V to 5.5V (vsPIC17C42A-08/PQ)
- Higher I/O current capability (25 mA sink/source per pin) versus most PIC16F parts at 20 mA (vsPIC16F877A-I/PT)
- 16-bit-wide instruction word delivers higher code density versus PIC16F's 14-bit instructions (vsPIC16F877-04I/PQ)
Ghi chú thiết kế
Decouple VDD (pins 11 and 32) with a 100 nF ceramic capacitor placed within 5 mm of each pin pair, plus a bulk 10 uF tantalum or aluminum polymer capacitor on the same node. The PIC17LC42A draws brief current spikes of up to 200 mA during OTP programming and flash operations; insufficient decoupling will cause programming failures and brown-out resets during normal execution. Add a 10 kohm pull-up on MCLR (pin 41) to VDD for clean reset transitions.
The 44-pin MQFP (PQ) package has 0.8 mm pitch gull-wing leads; follow the IPC-7351 nominal land pattern with a pad width of 0.30 mm and length of 1.5 mm. Place a continuous ground plane on the layer beneath the part to provide thermal spreading and a low-impedance return for the high-current I/O transitions. Keep clock traces (OSC1, OSC2) under 10 mm and shield them with a ground guard trace to avoid noise injection into the ADC analog inputs on Port A.
Do not confuse the 'LC' low-voltage variant with the standard 'C' part - the PIC17LC42A requires VIN >= 2.5 V but the standard PIC17C42A requires >= 4.5 V and may malfunction below 4.5 V. When migrating code between the two, verify all delay-loop timing constants because instruction timing can vary with VDD. The OTP memory can only be programmed once in production; engineers should validate firmware on a windowed PIC17LC42AT-08/L before committing to the OTP part.
Port A pins (33-40) double as analog inputs; configure the PCFG bits in the ADCON1 register to disable the digital input buffer on any pin used as analog to reduce cross-talk and input-leakage current. Estimated: at 5 V VDD, leaving the digital buffer enabled on a floating analog pin can inject up to 1 uA of leakage into the ADC sample-and-hold, degrading 10-bit conversion accuracy on adjacent channels by 1-2 LSBs.
Thông tin tuân thủ
RoHS, lead-free, and REACH compliance data were not present in the verified web data and must be confirmed against Microchip's product environmental compliance page before use in restricted-substance applications. The part is commercial temperature grade (0C to +70C) and is NOT AEC-Q100 qualified; for automotive applications use the Q1 suffix or migrate to dsPIC33EV family.
