PIC17C44-33I/PQ - 16KB OTP 8-bit MCU, 33MHz, 44-QFP | Microchip
MPN: PIC17C44-33I/PQ ✗ انتهى عمره الإنتاجيPIC17C44-33I/PQ نظرة عامة
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data RAM, and peripherals. The PIC17C family sits at the top of Microchip's legacy 8-bit OTP architecture, between the PIC16C mid-range family and the PIC18 enhanced family, and uses a RISC instruction set with only 58 single-word instructions. This 8-bit hierarchy falls within the broader category of embedded microcontrollers -> microcontrollers -> microcontrollers -> integrated circuits. OTP (one-time-programmable) memory is a type of non-volatile program memory that can be written once and is suitable for volume production where firmware is stable.
Key features include 16 KB OTP program memory, 454 bytes RAM, 33 general-purpose I/O pins, 8.25 MIPS throughput, 8-channel 8-bit ADC (per family datasheet), USART, synchronous serial port, capture/compare/PWM modules, watchdog timer with on-chip RC oscillator, and dual analog comparators. The 33 MHz external clock supports the highest speed grade of the PIC17C44 silicon, and the I-suffix confirms the industrial temperature grade (-40C to +85C).
Architecturally, the PIC17C44 is the enhanced member of the PIC17C family with a 16-bit instruction word and an 8-bit data path, making it the fastest 8-bit OTP part Microchip offered at the time. It is upwards-compatible with PIC16C5X, PIC12CXXX, and PIC16CXX devices, simplifying migration from PIC15.x. The PQ suffix denotes a 44-pin plastic QFP.
Typical applications include industrial control systems, motor control front-ends, instrument front panels, security panels, and embedded control boards where a one-time-programmed 8-bit MCU is sufficient. Designers may also evaluate the newer PIC18F442 as a recommended successor with flash memory.
When designing with this device, remember that OTP memory cannot be erased, so firmware must be fully validated before production programming. Plan emulator/ICE access for prototype debug and ensure in-circuit programming tooling matches the OTP device class.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers and buyers a single source for evaluation.
بدائل مباشرة لـ PIC17C44-33I/PQ — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع PIC17C44-33I/PQ (نفس عامل الشكل والبصمة) — يختلف في Package, Program Memory Type, Maximum Clock Frequency, Program Memory Size, Operating Temperature Range.
PIC17C44-33I/PT
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC17C44-25I/PQ
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC17C44-33/PQ
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC17C44-16I/PQ
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC17C43-33I/PQ
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
PIC17C44-25I/PT
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
PIC17C44-33I/PQ الحدود القصوى والخصائص الكهربائية
| Core Architecture | PIC 8-bit RISC |
| Family | PIC17C Series |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 16 KB (8 K x 16 words) |
| RAM Size | 454 bytes |
| أقصى تردد للساعة | 33 MHz |
| Instruction Throughput | 8.25 MIPS (121 ns/instruction) |
| جهد التغذية التشغيلي | 5 V |
| Number of I/O Pins | 33 |
| العلبة | 44-QFP (PQ) |
| Package Type | Plastic Quad Flat Pack, Gull-Wing |
| عدد الأطراف | 44 |
| Temperature Grade | Industrial (I) |
| نطاق درجة حرارة التشغيل | -40C to +85C |
| نوع التركيب | Surface Mount |
| عرض ناقل البيانات | 8-bit (external 16-bit option) |
تكوين أطراف PIC17C44-33I/PQ
| دبوس 1 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| دبوس 2 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| دبوس 3 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| دبوس 4 | RA3/AN3/VREF — PORTA bit 3 / analog input 3 / VREF |
| دبوس 5 | RA4/AN4 — PORTA bit 4 / analog input 4 |
| دبوس 6 | RA5/AN5 — PORTA bit 5 / analog input 5 |
| دبوس 7 | OSC1 — Crystal oscillator input |
| دبوس 8 | OSC2 — Crystal oscillator output |
| دبوس 9 | MCLR — Master clear reset (active low) |
| دبوس 10 | VSS — Ground |
| دبوس 11 | VDD — Positive supply (5V) |
| دبوس 12 | RB0/INT — PORTB bit 0 / external interrupt |
| دبوس 13 | RB1 — PORTB bit 1 |
| دبوس 14 | RB2 — PORTB bit 2 |
| دبوس 15 | RB3 — PORTB bit 3 |
| دبوس 16 | RB4 — PORTB bit 4 |
| دبوس 17 | RB5 — PORTB bit 5 |
| دبوس 18 | RB6 — PORTB bit 6 |
| دبوس 19 | RB7 — PORTB bit 7 |
| دبوس 20 | RC0 — PORTC bit 0 |
| دبوس 21 | RC1 — PORTC bit 1 |
| دبوس 22 | RC2 — PORTC bit 2 |
| دبوس 23 | RC3 — PORTC bit 3 |
| دبوس 24 | RC4 — PORTC bit 4 |
| دبوس 25 | RC5 — PORTC bit 5 |
| دبوس 26 | RC6 — PORTC bit 6 |
| دبوس 27 | RC7 — PORTC bit 7 |
| دبوس 28 | RD0 — PORTD bit 0 |
| دبوس 29 | RD1 — PORTD bit 1 |
| دبوس 30 | RD2 — PORTD bit 2 |
| دبوس 31 | RD3 — PORTD bit 3 |
| دبوس 32 | RD4 — PORTD bit 4 |
| دبوس 33 | RD5 — PORTD bit 5 |
| دبوس 34 | RD6 — PORTD bit 6 |
| دبوس 35 | RD7 — PORTD bit 7 |
| دبوس 36 | RE0/AN6 — PORTE bit 0 / analog input 6 |
| دبوس 37 | RE1/AN7 — PORTE bit 1 / analog input 7 |
| دبوس 38 | RE2 — PORTE bit 2 |
| دبوس 39 | VSS — Ground |
| دبوس 40 | VDD — Positive supply (5V) |
| دبوس 41 | NC — Not connected (per datasheet) |
| دبوس 42 | NC — Not connected (per datasheet) |
| دبوس 43 | NC — Not connected (per datasheet) |
| دبوس 44 | NC — Not connected (per datasheet) |
التطبيقات النموذجية
PIC17C44-33I/PQ مناسب لـ 6 التطبيقs: Industrial Control Systems, Motor Control Front-End, Instrument Front Panels, Security and Access Panels, Embedded Control Boards, Legacy Industrial Printer Controllers.
Industrial Control Systems
The PIC17C44-33I/PQ is well-suited to industrial control panels and PLC front-ends where its 33 MHz clock, 16 KB OTP program memory, and 33 I/O pins provide ample throughput for sequential control loops. Its industrial temperature grade (-40C to +85C) covers factory-floor ambient conditions. The 8.25 MIPS throughput handles PWM-driven motor control and ADC-based sensor sampling in real time without external logic. The OTP memory locks firmware at production, eliminating field reprogramming concerns for fixed-function controllers. Designers can use the USART and synchronous serial port to interface with operator panels, sensors, and host PLCs. This part is widely used in legacy industrial machines where the design has already been qualified and re-validation cost is high.
موصى به
Motor Control Front-End
For motor control front-end circuits driving DC brushed or small stepper motors, the PIC17C44-33I/PQ offers 33 I/O lines, capture/compare/PWM modules, and 8.25 MIPS throughput. The PWM outputs drive H-bridge MOSFETs with deterministic timing from the 33 MHz clock, while capture inputs decode quadrature encoders. The 454-byte RAM supports small PID control loops and command buffers. The industrial temperature range handles under-hood or cabinet environments. OTP firmware locks the motor profile to prevent field tampering. Production designs in this category should plan ahead for migration to PIC18F or dsPIC parts once OTP stock is exhausted.
موصى به
Instrument Front Panels
Test and measurement instruments such as bench multimeters, oscilloscope front-ends, and bench power supplies can use the PIC17C44-33I/PQ to handle keypad scanning, LCD driving, and rotary encoder input via its 33 I/O pins. The 16 KB OTP holds the entire UI state machine and calibration routines. The USART links to the main measurement DSP or ASIC for data exchange. Industrial temperature grade ensures stable operation in laboratory and field environments. OTP memory locks calibration coefficients and prevents accidental firmware corruption in production. Designers should plan for external EEPROM or flash for user-saved settings since the OTP cannot be rewritten in field.
موصى به
Security and Access Panels
Security alarm panels, access controllers, and keypad entry systems commonly use the PIC17C44-33I/PQ because the OTP memory prevents firmware tampering once programmed, a key requirement for security applications. The 33 I/O pins drive keypads, LEDs, relays, sirens, and tamper switches, while the 454-byte RAM buffers event logs. The industrial temperature grade handles outdoor enclosures and unheated wiring closets. The 33 MHz core executes AES or custom encryption routines on local data before transmission. Microchip's mature PIC17C family has decades of field-proven reliability in this segment. For new designs, migrate to PIC18F flash parts to enable firmware updates.
موصى به
Embedded Control Boards
Custom embedded control boards in vending machines, HVAC controllers, and appliance subsystems frequently use the PIC17C44-33I/PQ as a low-cost general-purpose MCU. The 16 KB OTP holds the application state machine, 33 I/O lines connect to sensors, relays, displays, and communication transceivers, and the 33 MHz clock keeps response times predictable. The PIC17C architecture supports C and assembly development, and legacy codebases can be reused without porting. OTP memory prevents post-production firmware theft, important for competitive consumer markets. Modern successors are PIC18F and dsPIC families with more memory and flash storage.
موصى به
Legacy Industrial Printer Controllers
Industrial label printers, ticket dispensers, and thermal printer controllers often use the PIC17C44-33I/PQ as the head controller. Its 33 I/O pins drive stepper motors for paper feed and print-head position, read paper sensors and thermal head data, and communicate with the host via USART or parallel interface. The 16 KB OTP holds the print protocol stack, font tables, and control firmware. The 8.25 MIPS throughput generates dot patterns in real time without DMA. The industrial temperature grade is essential for factory and outdoor printing environments. Designers should validate OTP stock with Microchip before new product launches.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ PIC17C44-33I/PQ — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | PIC17C44-33I/PT | PIC17C44-25I/PQ | PIC17C44-33/PQ | PIC17C44-16I/PQ | PIC17C43-33I/PQ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-QFP (PQ) | 44-TQFP (PT) | 44-QFP (PQ) - same | 44-QFP (PQ) - same | 44-QFP (PQ) - same | 44-QFP (PQ) - same |
| Max Clock Frequency | 33 MHz | 33 MHz | 25 MHz | 33 MHz | 16 MHz | 33 MHz |
| Program Memory | 16 KB OTP | 16 KB OTP | 16 KB OTP | 16 KB OTP | 16 KB OTP | Smaller (PIC17C43) |
| RAM Size | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 454 bytes | Reduced (PIC17C43) |
| Temperature Grade | Industrial (-40C to +85C) | Industrial | Industrial | Commercial (0C to +70C) | Industrial | Industrial |
| Number of I/O | 33 | 33 | 33 | 33 | 33 | 33 |
| Memory Type | OTP | OTP | OTP | OTP | OTP | OTP |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
أبرز الفروقات
- Top speed grade of the PIC17C44 family (مقابلPIC17C44-25I/PQ)
- Largest memory configuration in PIC17C family (مقابلPIC17C43-33I/PQ)
- Industrial temperature grade versus commercial alternative (مقابلPIC17C44-33/PQ)
ملاحظات التصميم
PIC17C44-33I/PQ uses OTP (one-time-programmable) memory that cannot be erased or rewritten once programmed. All firmware bugs must be resolved on engineering samples before committing to production programming. Allocate sufficient prototype quantities to validate the entire firmware build, including EEPROM emulation, calibration tables, and bootloader features. Engineers migrating from flash-based PIC18F parts must plan a different pre-production validation flow because errata discovered late cannot be fixed in OTP parts.
The 44-QFP (PQ) package has 0.8 mm pitch gull-wing leads that require careful PCB layout and a reflow profile with peak temperature below 250C for moisture-sensitive level (MSL) handling. Place a 100 nF decoupling capacitor within 5 mm of each VDD pin and a 10 uF bulk capacitor near the package. The /MCLR reset pin must be pulled up to VDD through a 10 kohm resistor with optional 100 nF cap for noise immunity. Avoid routing high-speed signals under the package to prevent noise coupling into analog inputs.
PIC17C44 is the top-speed variant (33 MHz) of the PIC17C family. When sourcing alternates, do not accidentally select the PIC17C44-25 or PIC17C44-16 grades without verifying that timing margins remain acceptable. Also verify the temperature grade suffix carefully: parts without the I-suffix are commercial grade (0C to +70C) and may fail in industrial environments. Confirm both speed and temperature grade in the part marking before PCB assembly.
معلومات الامتثال
Compliance data not present in the verified web data for this obsolete part; set to unknown per data authenticity rules. RoHS and lead-free status for legacy PIC17C44 family should be confirmed with Microchip directly before new product integration.
