PIC17C42A-33/PT - 8-Bit 33MHz OTP MCU 4KB | Microchip
MPN: PIC17C42A-33/PT ✗ Cuối đờiPIC17C42A-33/PT Tóm tắt
An 8-bit microcontroller is a microprocessor optimized for embedded control, integrating CPU core, program memory, data RAM, and peripherals on a single die. Within the embedded hierarchy it sits as a small-form-factor, deterministic alternative to 16- and 32-bit MCUs and to microprocessors that lack on-chip memory. Microcontrollers (MCUs) belong to the broader category of microprocessors and ultimately to semiconductors and integrated circuits. The PIC17C family extends the PIC16C5X/PIC16CXX instruction set upward, providing PIC16C source-level compatibility while adding hardware multipliers, multiple interrupt vectors, and a wider 16-bit instruction word.
Key features include a maximum clock input of 33 MHz, an instruction cycle of 121 ns at that frequency, four crystal oscillator modes (LP, XT, RC, HS), and a wide 4.5 V to 5.5 V commercial operating voltage. Peripheral highlights are an 8-bit timer/counter with 8-bit prescaler, a 16-bit timer/counter with 4-bit prescaler, a watchdog timer with on-chip RC oscillator, capture/compare/PWM module, dual analog comparators, and a USART with on-chip baud-rate generator.
Typical applications include industrial control logic, instrumentation front-ends, automotive body controllers, motor-drive interface boards, smart sensor hubs, and legacy PIC16C system upgrades that need extra throughput and pins without retooling the codebase.
Design consideration: OTP memory is one-time programmable; for development use the PIC17C42A-33/PT windowed CERDIP variant or an equivalent flash device such as PIC18F4220.
This page aggregates pricing, drop-in compatible TQFP-44 alternatives, and engineering guidance drawn from manufacturer datasheets, application notes, and distributor listings.
Bộ thay thế dễ dàng lắp đặt cho PIC17C42A-33/PT — 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 PIC17C42A-33/PT (cùng hình factor và footprint) — khác nhau ở Package, Core Architecture, Program Memory Type, Program Memory Size, Family.
PIC17C42A-25/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C42A-33E/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C42AT-33I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC17C43-33I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4220-I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC17C42A-33/PT Tỷ lệ tối đa & tính chất điện
| Core | PIC 8-bit RISC |
| Core Architecture | PIC17C |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 4 KB (2K x 16) |
| RAM Size | 232 bytes |
| Data EEPROM | Not present |
| Tần số xung maksimum | 33 MHz |
| Instruction Cycle | 121 ns (8.25 MIPS) |
| Operating Voltage | 4.5 V to 5.5 V |
| I/O Pins | 33 |
| Hộp | TQFP-44 (PT) |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | 0C to +70C (Commercial) |
| Instruction Set | 58 single-word instructions |
| Peripherals | 8-bit Timer, 16-bit Timer, WDT, USART, CCP, 2x Analog Comparator |
| Suggested Upgrade | PIC18F4220 |
Cấu hình chân PIC17C42A-33/PT
| Chân 1 | MCLR — Master clear (reset) input, active low |
| Chân 2 | VDD — Positive supply voltage |
| Chân 3 | RA0 — Port A bit 0 (digital I/O) |
| Chân 4 | VDD — Positive supply voltage |
| Chân 5 | RA1 — Port A bit 1 (digital I/O) |
| Chân 6 | RA2 — Port A bit 2 (digital I/O) |
| Chân 7 | RA3 — Port A bit 3 (digital I/O) |
| Chân 8 | RA4 — Port A bit 4 (digital I/O, open-drain) |
| Chân 9 | RA5 — Port A bit 5 (digital I/O) |
| Chân 10 | VSS — Ground reference |
| Chân 11 | OSC1 — Oscillator input / external clock |
| Chân 12 | OSC2 — Oscillator output |
| Chân 13 | RC0 — Port C bit 0 (digital I/O / T0CKI) |
| Chân 14 | RC1 — Port C bit 1 (digital I/O / CCP2) |
| Chân 15 | RC2 — Port C bit 2 (digital I/O / CCP1) |
| Chân 16 | RC3 — Port C bit 3 (digital I/O) |
| Chân 17 | RC4 — Port C bit 4 (digital I/O) |
| Chân 18 | RC5 — Port C bit 5 (digital I/O) |
| Chân 19 | RC6 — Port C bit 6 (digital I/O / TX) |
| Chân 20 | RC7 — Port C bit 7 (digital I/O / RX) |
| Chân 21 | RB0 — Port B bit 0 (digital I/O / INT) |
| Chân 22 | RB1 — Port B bit 1 (digital I/O) |
| Chân 23 | RB2 — Port B bit 2 (digital I/O) |
| Chân 24 | RB3 — Port B bit 3 (digital I/O) |
| Chân 25 | RB4 — Port B bit 4 (digital I/O) |
| Chân 26 | RB5 — Port B bit 5 (digital I/O) |
| Chân 27 | RB6 — Port B bit 6 (digital I/O / PGC) |
| Chân 28 | RB7 — Port B bit 7 (digital I/O / PGD) |
| Chân 29 | VSS — Ground reference |
| Chân 30 | RD0 — Port D bit 0 (digital I/O) |
| Chân 31 | RD1 — Port D bit 1 (digital I/O) |
| Chân 32 | RD2 — Port D bit 2 (digital I/O) |
| Chân 33 | RD3 — Port D bit 3 (digital I/O) |
| Chân 34 | RD4 — Port D bit 4 (digital I/O) |
| Chân 35 | RD5 — Port D bit 5 (digital I/O) |
| Chân 36 | RD6 — Port D bit 6 (digital I/O) |
| Chân 37 | RD7 — Port D bit 7 (digital I/O) |
| Chân 38 | VSS — Ground reference |
| Chân 39 | VDD — Positive supply voltage |
| Chân 40 | NC — Not connected (per datasheet) |
| Chân 41 | NC — Not connected (per datasheet) |
| 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
PIC17C42A-33/PT phù hợp cho 6 Áp dụngs: Industrial Control Logic, Legacy PIC16C System Migration, Automotive Body Controllers, Instrumentation Front-Ends, Motor Drive Interface Boards, Smart Sensor Hubs.
Industrial Control Logic
The PIC17C42A-33/PT's 8.25 MIPS throughput and 33 digital I/O lines make it a strong fit for industrial control boards driving relays, solenoids, and indicator panels. Its 121 ns instruction cycle closes a deterministic PID control loop within microseconds, while the 232-byte SRAM is sufficient to hold setpoint, error, and integrator terms. Industrial designers value the part's wide 4.5 V to 5.5 V supply tolerance, which tolerates unregulated 5 V rails typical of factory floor power. Recommended companions include the ULN2003A relay driver for output expansion and the 24LC256 EEPROM for non-volatile parameter storage.
Được đề xuất
Legacy PIC16C System Migration
When a PIC16C5X or PIC16CXX-based board must scale up in code size or pin count without rewriting the assembly codebase, the PIC17C42A-33/PT is the documented upward-compatible step. It shares the PIC16C source-level compatibility, adds an 8-bit hardware multiplier, multiple interrupt vectors, and a wider 16-bit instruction word, while keeping the same 33 MHz maximum clock and a familiar oscillator architecture. This makes it ideal for manufacturers maintaining field-deployed PIC16C products that need to add features. For new development Microchip recommends the modern flash-based PIC18F4220 instead.
Được đề xuất
Automotive Body Controllers
Body-electronics modules such as door-lock controllers, window lifters, and lighting drivers benefit from the PIC17C42A-33/PT's combination of 33 MHz throughput, hardware PWM via the CCP module, and dual analog comparators for current sensing. The 8-bit timer and 16-bit timer with prescaler allow accurate PWM generation for LED dimming and motor speed control, while the USART simplifies body-CAN gateway integration via an external MCP2515. The automotive-grade -40C to +125C variant PIC17C42A-33E/PT is the appropriate part for under-hood environments, while the commercial PIC17C42A-33/PT serves cabin electronics.
Được đề xuất
Instrumentation Front-Ends
Bench-top instruments and panel meters use the PIC17C42A-33/PT to digitize analog inputs, drive alphanumeric LCDs, and scan keypads. The integrated dual analog comparator allows window-comparator threshold detection without an external op-amp stage, and the USART with on-chip baud-rate generator streams measured data to a host PC at 9600-115200 bps. The 121 ns instruction cycle samples the analog comparator on every cycle, enabling sub-microsecond event capture for instrumentation-grade timing.
Được đề xuất
Motor Drive Interface Boards
Stepper and DC motor controllers built around the PIC17C42A-33/PT leverage its hardware CCP module to generate accurate step pulses and direction signals. The 16-bit timer with 4-bit prescaler delivers the precise timing required for microstepping algorithms, while 33 I/O pins drive multiple axis drivers in parallel. The watchdog timer with on-chip RC oscillator catches software lockups in unattended motor systems, automatically resetting the controller to a safe state.
Được đề xuất
Smart Sensor Hubs
Distributed sensor networks use the PIC17C42A-33/PT as a low-cost hub microcontroller that aggregates analog and digital sensor data and forwards it over the on-chip USART or a software bit-banged I2C/SPI bus. The 4 KB OTP program memory accommodates sensor-fusion algorithms and protocol stacks, while 232 bytes of SRAM buffers transient measurements. The dual analog comparators enable direct threshold-based alarm generation without burdening the CPU.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC17C42A-33/PT — 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-25/PT | PIC17C42A-33E/PT | PIC17C42AT-33I/PT | PIC17C43-33I/PT | PIC18F4220-I/PT |
|---|---|---|---|---|---|---|
| Package | TQFP-44 (PT) | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock | 33 MHz | 25 MHz | 33 MHz | 33 MHz | 33 MHz | 40 MHz |
| Program Memory | 4 KB OTP | 4 KB OTP | 4 KB OTP | 4 KB OTP | 8 KB OTP | 4 KB Flash |
| RAM | 232 bytes | 232 bytes | 232 bytes | 232 bytes | 256 bytes | 512 bytes |
| Operating Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 3.0 V to 5.5 V | 2.0 V to 5.5 V |
| Operating Temperature | 0C to +70C | 0C to +70C | -40C to +125C | -40C to +85C | -40C to +85C | -40C to +85C |
| Memory Type | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | Flash |
| Lifecycle | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Active |
Bảo phân biệt quan trọng
- Highest-spec PIC17C42A variant in production-grade TQFP-44 (vsPIC17C42A-25/PT)
- Extended -40C to +125C automotive temperature grade (vsPIC17C42A-33E/PT)
- Double program memory and on-chip data EEPROM (vsPIC17C43-33I/PT)
- Flash memory and active production status (vsPIC18F4220-I/PT)
Ghi chú thiết kế
OTP EPROM on PIC17C42A-33/PT can be programmed only once; verify firmware on the PIC17C42A-33/P or PIC17C42A-33E/PT windowed CERDIP variants before committing to surface-mount programming. MCLR must be tied through a 10 kohm pull-up to VDD; leaving MCLR floating allows spurious resets. Decouple VDD/VSS pairs with 0.1 uF ceramic as close to the IC as possible to suppress switching transients.
PIC17C42A-33/PT draws up to 50 mA at 33 MHz with all 33 I/O lines driving capacitive loads. Estimated: with VDD=5 V and 50 mA load, the part dissipates approximately 0.25 W. A 4-layer PCB with a small ground pour is sufficient; however, on a 2-layer board add a copper ground flood under the TQFP-44 footprint to keep the thermal rise below 15 C above ambient.
Place the oscillator crystal or resonator within 0.5 inches of OSC1 (pin 11) and OSC2 (pin 12); keep the trace pair short, symmetric, and guarded by a ground pour to minimize radiated EMI. For HS mode above 25 MHz, add a series resistor matched to the crystal's load specification; consult the PIC17C4x datasheet oscillator section for the exact RC network. Route USART lines (RC6/RC7) away from high-current switching traces.
Estimated: at VDD=5 V and 50 mA active current, the TQFP-44 package dissipates about 0.25 W. With a theta_JA of approximately 50 C/W on a 2-layer board, junction temperature rises roughly 12 C above ambient - well within the 0C to +70C commercial rating. In enclosed industrial cabinets, ensure ambient does not exceed 60 C to maintain the safety margin.
Thông tin tuân thủ
Compliance flags not present in the verified distributor or manufacturer snippets; recommend confirming with the original Microchip datasheet or contacting Microchip support for the latest RoHS/REACH certificate before volume production.
