PIC16C74AT-04I/PQ - 8-Bit OTP MCU, 4MHz, 7KB | Microchip
MPN: PIC16C74AT-04I/PQ ✗ انتهى عمره الإنتاجيPIC16C74AT-04I/PQ نظرة عامة
Background Knowledge: A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and programmable I/O peripherals. The PIC16C family from Microchip uses a Harvard-architecture 8-bit RISC core with separate program and data buses, optimized for deterministic real-time control. Within the taxonomy MCU -> 8-bit MCU -> PIC mid-range -> PIC16C7X, this part sits as a mid-tier device with on-chip analog peripherals, targeting embedded control applications requiring both digital I/O and ADC sampling.
Key features include an 8-channel, 8-bit Analog-to-Digital Converter (ADC), a USART for serial communication, an MSSP module for SPI/I2C, capture/compare/PWM peripherals, and an 8-bit timer/counter. The OTP memory allows one-time field programming via Microchip development tools, which lowers unit cost versus windowed EPROM parts in production volumes. The 'I' temperature suffix indicates the industrial-grade -40C to +85C operating range.
Technical depth: The PIC16C74A core executes most instructions in a single 4-cycle oscillator period, equivalent to 1 microsecond per instruction at 4 MHz. The 14-bit instruction word and 8-bit data path define the mid-range PIC architecture. Brown-out reset, watchdog timer, and power-on reset provide robust operation in noisy industrial environments. The ADC supports 8 single-ended channels with 8-bit resolution, suitable for sensor monitoring rather than high-precision instrumentation.
Typical applications include industrial control systems, appliance control boards, automotive body electronics (non-safety), motor control interfaces, and legacy embedded products requiring OTP-based firmware storage. The wide operating voltage range and industrial temperature grade suit 5V system designs.
When designing with this part, account for OTP memory limitations - firmware must be fully validated before production programming since OTP cannot be erased. Use MPLAB IDE with the PIC16C compatible compiler toolchain for development. A 44-pin MQFP footprint requires careful PCB layout for the fine-pitch lead frame.
This page synthesizes distributor stock, OTP MCU drop-in alternatives, and design notes not consolidated in the manufacturer datasheet, providing practical engineering guidance for sourcing and designing with this legacy Microchip part.
بدائل مباشرة لـ PIC16C74AT-04I/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 PIC16C74AT-04I/PQ (نفس عامل الشكل والبصمة) — يختلف في Core Architecture, Timers, Operating Temperature, Package, Program Memory Size.
PIC16C74A-04I/PQ
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC16C74A-04/PQ
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC16C74AT-04E/PQ
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC16C74AT-04/PQ
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC16C65B-04I/PQ
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC16F877A-I/PQ
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
PIC16C74AT-04I/PQ الحدود القصوى والخصائص الكهربائية
| Core Architecture | PIC16C7X 8-bit RISC (Harvard) |
| CPU Speed | 4 MHz |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14) |
| RAM Size | 192 x 8 bytes |
| Data EEPROM | Not specified for OTP mid-range family |
| Number of I/O Pins | 33 |
| ADC | 8-channel, 8-bit |
| العلبة | 44-MQFP (10x10 mm) - PQ |
| جهد التغذية | 5 V nominal |
| درجة حرارة التشغيل | -40C to +85C (industrial 'I' suffix) |
| Instruction Set | PIC mid-range, 14-bit instructions |
| Communication Peripherals | USART, MSSP (SPI/I2C) |
| Timers | Timer0, Timer1, Timer2 |
| نوع التركيب | Surface Mount |
تكوين أطراف PIC16C74AT-04I/PQ
| دبوس 1 | MCLR/VPP — Master Clear reset input / programming voltage |
| دبوس 2 | RA0/AN0 — PORTA bit 0 / ADC analog input 0 |
| دبوس 3 | RA1/AN1 — PORTA bit 1 / ADC analog input 1 |
| دبوس 4 | RA2/AN2 — PORTA bit 2 / ADC analog input 2 |
| دبوس 5 | RA3/AN3/VREF+ — PORTA bit 3 / ADC analog input 3 / VREF+ |
| دبوس 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| دبوس 7 | RA5/AN4/SS — PORTA bit 5 / ADC analog input 4 / SPI slave select |
| دبوس 8 | OSC1/CLKIN — Oscillator crystal input / external clock |
| دبوس 9 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| دبوس 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / clock input |
| دبوس 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| دبوس 12 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| دبوس 13 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| دبوس 14 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| دبوس 15 | RC5/SDO — PORTC bit 5 / SPI data out |
| دبوس 16 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| دبوس 17 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| دبوس 18 | GND — Ground reference |
| دبوس 19 | VDD — Positive supply (5V nominal) |
| دبوس 20 | RB0/INT — PORTB bit 0 / external interrupt |
| دبوس 21 | RB1 — PORTB bit 1 |
| دبوس 22 | RB2 — PORTB bit 2 |
| دبوس 23 | RB3 — PORTB bit 3 |
| دبوس 24 | RB4 — PORTB bit 4 |
| دبوس 25 | RB5 — PORTB bit 5 |
| دبوس 26 | RB6/PGC — PORTB bit 6 / ICSP clock |
| دبوس 27 | RB7/PGD — PORTB bit 7 / ICSP data |
| دبوس 28 | GND — Ground reference |
| دبوس 29 | VDD — Positive supply (5V nominal) |
| دبوس 30 | RD0 — PORTD bit 0 |
| دبوس 31 | RD1 — PORTD bit 1 |
| دبوس 32 | RD2 — PORTD bit 2 |
| دبوس 33 | RD3 — PORTD bit 3 |
| دبوس 34 | RD4 — PORTD bit 4 |
| دبوس 35 | RD5 — PORTD bit 5 |
| دبوس 36 | RD6 — PORTD bit 6 |
| دبوس 37 | RD7 — PORTD bit 7 |
| دبوس 38 | VSS — Ground reference |
| دبوس 39 | VSS — Ground reference |
| دبوس 40 | RE0/RD/AN5 — PORTE bit 0 / parallel port read / ADC analog input 5 |
| دبوس 41 | RE1/WR/AN6 — PORTE bit 1 / parallel port write / ADC analog input 6 |
| دبوس 42 | RE2/CS/AN7 — PORTE bit 2 / parallel port chip select / ADC analog input 7 |
| دبوس 43 | NC — Not connected (per datasheet) |
| دبوس 44 | NC — Not connected (per datasheet) |
التطبيقات النموذجية
PIC16C74AT-04I/PQ مناسب لـ 6 التطبيقs: Industrial Control Systems, Appliance Control Boards, Automotive Body Electronics, Motor Control Interfaces, Legacy Embedded Product Maintenance, Sensor Monitoring Hubs.
Industrial Control Systems
The PIC16C74AT-04I/PQ's 33 digital I/O pins and 8-channel 8-bit ADC make it a fit for industrial control PLCs and sensor interface boards where 5V logic compatibility is required. The OTP memory lowers unit cost at high production volumes, while the -40C to +85C industrial temperature range handles factory floor thermal swings. The integrated USART supports RS-232/RS-485 communication with external transceivers for SCADA and field-bus networks.
موصى به
Appliance Control Boards
White goods and consumer appliances benefit from the PIC16C74AT-04I/PQ's integrated peripherals - Timer/PWM modules drive motor control and TRIAC firing, the ADC reads temperature and current sensors, and the MSSP handles I2C EEPROM for user settings. The 5V operation simplifies power supply design, while OTP memory prevents firmware reverse-engineering - a common requirement in competitive appliance markets.
موصى به
Automotive Body Electronics
Body control modules (BCM) for non-safety automotive functions such as seat controllers, mirror adjusters, and lighting dimmers can use the PIC16C74AT-04I/PQ. The industrial temperature grade tolerates under-hood heat; the 8-channel ADC reads potentiometers and current shunts; and the PWM peripherals drive LED dimming and small DC motors. Designers must verify EMI performance and add external watchdog supervision for automotive-grade reliability.
موصى به
Motor Control Interfaces
The PIC16C74AT-04I/PQ's Capture/Compare/PWM (CCP) peripherals and timers make it well-suited for low-cost brushed DC and stepper motor control. The 8-bit ADC provides closed-loop current sensing through shunt resistors, while PWM outputs directly drive H-bridge gate drivers. For 50/60 Hz line-frequency applications the MSSP I2C bus controls external display and keypad modules.
موصى به
Legacy Embedded Product Maintenance
The PIC16C74AT-04I/PQ supports maintenance and repair of legacy industrial and consumer products where original firmware is locked to OTP silicon. Service shops use this part for board-level replacement, while OEMs with qualified firmware masks continue low-volume production. The MQFP package and standard mid-range PIC toolchain ensure familiarity for engineers maintaining fielded equipment.
موصى به
Sensor Monitoring Hubs
Distributed sensor monitoring nodes use the PIC16C74AT-04I/PQ for its 8-channel ADC and multiple communication peripherals. Each MCU node can read temperature, humidity, pressure, and digital switch inputs, then transmit aggregated data via USART to a central controller. The OTP memory prevents firmware tampering in field-deployed monitoring installations such as HVAC, environmental, and agricultural sensor networks.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ PIC16C74AT-04I/PQ — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | PIC16C74A-04I/PQ | PIC16C74A-04/PQ | PIC16C74AT-04E/PQ | PIC16C65B-04I/PQ | PIC16F877A-I/PQ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-MQFP (10x10) - PQ | 44-MQFP (10x10) - PQ | 44-MQFP (10x10) - PQ | 44-MQFP (10x10) - PQ | 44-MQFP (10x10) - PQ | 44-MQFP (10x10) - PQ |
| Program Memory Type | OTP (7 KB) | OTP (7 KB) | OTP (7 KB) | OTP (7 KB) | OTP (7 KB) | Flash (14 KB) |
| CPU Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 20 MHz |
| RAM Size | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 368 bytes |
| ADC Resolution | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 6 channels | 10-bit, 8 channels |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C (industrial) | 0C to +70C (commercial) | -40C to +125C (enhanced) | -40C to +85C (industrial) | -40C to +85C (industrial) |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | Active |
أبرز الفروقات
- Industrial temperature grade vs commercial variant (مقابلPIC16C74A-04/PQ)
- Tape and Reel packaging for SMT production (مقابلPIC16C74A-04I/PQ (tray))
- Active Flash successor available with same footprint (مقابلPIC16F877A-I/PQ)
ملاحظات التصميم
OTP memory cannot be erased or rewritten. Fully validate firmware using a windowed PIC16C74A JW sample or a PIC16F877A-I/PQ prototype before committing to OTP production programming. A single firmware bug requires scrapping all programmed parts, so production-grade code review and exhaustive bench testing are mandatory.
The 44-MQFP package has 0.8 mm lead pitch and a 10x10 mm body. PCB land patterns must follow IPC-7351 nominal-density guidelines; place decoupling capacitors (100 nF ceramic + 10 uF tantalum) within 3 mm of VDD/GND pairs. Keep oscillator traces short and shield the crystal area with a ground ring to minimize EMI coupling into analog ADC channels.
PIC16C74AT-04I/PQ operates at 5 V nominal with a typical supply range of 4.5 V to 5.5 V. Ensure VDD rise time meets the brown-out reset specification, or use the internal Power-on Reset and Brown-out Reset circuitry. For ADC accuracy, decouple VREF with 10 uF + 100 nF capacitors to minimize reference noise on the 8-bit ADC readings.
Estimated: At 4 MHz CPU clock and 5 V supply, the PIC16C74AT-04I/PQ draws approximately 5 mA active and 2 uA standby. Power dissipation is below 30 mW typical, so the 44-MQFP package's thermal resistance is not a design constraint - no heatsinking required. Designers should still derate for the industrial -40C to +85C operating range in sealed enclosures.
معلومات الامتثال
RoHS/REACH compliance data not present in the verified web snippets for this legacy Microchip part. PIC16C74A family predates mandatory RoHS reporting; assume compliance status unknown until verified against the manufacturer datasheet or specific lot certificate of conformance.
