PIC16C74B-04E/PT - 8-bit OTP MCU, 7KB, 4MHz, TQFP-44 | Microchip
MPN: PIC16C74B-04E/PT ✗ پایان تولیدPIC16C74B-04E/PT نمای کلی
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (ROM/EPROM/Flash), volatile data memory (RAM), and a set of programmable peripherals (timers, ADC, communication ports, GPIO). Within the broader taxonomy, the PIC16C74B belongs to the 8-bit MCU family -> mid-range PIC architecture -> RISC MCU -> embedded controller. These devices are designed for deterministic real-time control with a small instruction set (35 single-word instructions), short interrupt latency, and low power consumption - typically under 15 uA at 5V/4 MHz and 1 uA standby at 3V/32 kHz.
Key features include 8 channels of 8-bit A/D conversion, 2 additional timers beyond the basic Timer0/Timer1 pair, 2 Capture/Compare/PWM (CCP) modules, a synchronous serial port configurable as either 3-wire SPI or 2-wire I2C, and a USART for asynchronous serial communication. High sink/source current of 25/25 mA per pin allows direct LED drive, while the EPROM-based program memory simplifies prototyping by enabling windowed erasure and reprogramming on JTAG/ICSP-compatible devices.
Architecturally, the PIC16C74B uses a Harvard-style separate program/data bus with a 14-bit instruction word and an 8-bit data path. The 200 ns instruction execution at 20 MHz (5 MIPS peak) and 1 us at 4 MHz deliver predictable timing for control loops. An integrated brown-out reset, power-on reset, watchdog timer with on-chip RC oscillator, and programmable code protection round out the embedded feature set.
Typical applications include industrial control panels, automotive body and instrument clusters, HVAC fan/blower controllers, white-goods motor control front-ends, and legacy embedded systems where OTP EPROM is acceptable. The TQFP-44 footprint suits high-density mainboards where DIP packages cannot fit.
When designing with this part, note the EPROM windowing caveat: only ceramic-windowed packages are erasable; the plastic TQFP-44 is one-time-programmable in production. Plan firmware accordingly and keep a programming reserve.
This page synthesizes distributor pricing, drop-in TQFP-44 alternatives, and design notes not aggregated in any single manufacturer datasheet, with cross-references validated against the Microchip parametric search and the PIC16C74B datasheet.
جایگزین‌های drop-in برای PIC16C74B-04E/PT — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای PIC16C74B-04E/PT (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Serial Interfaces, Package, ADC, Core Architecture, Operating Temperature Range.
PIC16F74-I/PT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC16F877A-04I/PT
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
PIC16C74B-04I/PT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC16C74B-20I/PT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC16C74B-04/PT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC16F747-I/PT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC16C74B-04E/PT حداکثر مقادیر مجاز و مشخصات الکتریکی
| Family | PIC16CXX mid-range |
| Core | 8-bit PIC RISC |
| Program Memory Size | 7 KB (4K x 14) EPROM (OTP) |
| RAM Size | 192 x 8 bytes |
| EEPROM Size | 0 bytes |
| Number of I/O Pins | 33 |
| ADC | 8 channels x 8-bit |
| Timers | 3 (Timer0, Timer1, Timer2) |
| CCP Modules | 2 (Capture/Compare/PWM) |
| Serial Interfaces | 1x SSP (SPI/I2C) + 1x USART |
| Instruction Set Size | 35 instructions (14-bit word) |
| Max CPU Frequency | 4 MHz |
| Instruction Cycle Time | 1 us @ 4 MHz |
| Operating Voltage Range | 2.5 V to 6.0 V |
| محدوده دمای کاری | -40 C to +125 C (Extended, "E" suffix) |
| I/O Sink/Source Current | 25 mA / 25 mA per pin |
| Typical Active Current | 15 uA typical @ 5V, 4 MHz |
| Typical Standby Current | 1 uA typical @ 3V, 32 kHz |
| بسته‌بندی | 44-pin TQFP (PT), 10x10 mm |
| نوع نصب | Surface Mount |
| Oscillator Type | External |
| Program Memory Type | EPROM (OTP) |
| Packaging | Tray |
پیکربندی پین PIC16C74B-04E/PT
| پین 1 | MCLR/VPP — Master Clear (reset) input / programming voltage |
| پین 2 | OSC1/CLKIN — Oscillator input / external clock input |
| پین 3 | OSC2/CLKOUT — Oscillator output / clock output |
| پین 4 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| پین 5 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| پین 6 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| پین 7 | RA3/AN3/VREF — PORTA bit 3 / analog input 3 / ADC voltage reference |
| پین 8 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| پین 9 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI slave select |
| پین 10 | VSS — Ground reference |
| پین 11 | VDD — Positive supply voltage |
| پین 12 | RB0/INT — PORTB bit 0 / external interrupt |
| پین 13 | RB1 — PORTB bit 1 |
| پین 14 | RB2 — PORTB bit 2 |
| پین 15 | RB3 — PORTB bit 3 |
| پین 16 | RB4 — PORTB bit 4 |
| پین 17 | RB5 — PORTB bit 5 |
| پین 18 | RB6/PGC — PORTB bit 6 / ICSP clock |
| پین 19 | RB7/PGD — PORTB bit 7 / ICSP data |
| پین 20 | VSS — Ground reference |
| پین 21 | VDD — Positive supply voltage |
| پین 22 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / clock input |
| پین 23 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| پین 24 | RC2/CCP1 — PORTC bit 2 / CCP1 |
| پین 25 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| پین 26 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| پین 27 | RC5/SDO — PORTC bit 5 / SPI data out |
| پین 28 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| پین 29 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| پین 30 | VSS — Ground reference |
| پین 31 | VDD — Positive supply voltage |
| پین 32 | RD0/PSP0 — PORTD bit 0 / parallel slave port bit 0 |
| پین 33 | RD1/PSP1 — PORTD bit 1 / parallel slave port bit 1 |
| پین 34 | RD2/PSP2 — PORTD bit 2 / parallel slave port bit 2 |
| پین 35 | RD3/PSP3 — PORTD bit 3 / parallel slave port bit 3 |
| پین 36 | RD4/PSP4 — PORTD bit 4 / parallel slave port bit 4 |
| پین 37 | RD5/PSP5 — PORTD bit 5 / parallel slave port bit 5 |
| پین 38 | RD6/PSP6 — PORTD bit 6 / parallel slave port bit 6 |
| پین 39 | RD7/PSP7 — PORTD bit 7 / parallel slave port bit 7 |
| پین 40 | VSS — Ground reference |
| پین 41 | VDD — Positive supply voltage |
| پین 42 | RE0/RD — PORTE bit 0 / parallel slave port read control |
| پین 43 | RE1/WR — PORTE bit 1 / parallel slave port write control |
| پین 44 | RE2/CS — PORTE bit 2 / parallel slave port chip select |
کاربردهای معمول
PIC16C74B-04E/PT مناسب است برای 6 کاربردs: Industrial Control Panels, Automotive Body and Instrument Modules, HVAC Fan and Blower Controllers, White-Goods Motor Control Front-Ends, Legacy Embedded Systems and Maintenance Boards, Educational and Trainer Platforms.
Industrial Control Panels
The PIC16C74B-04E/PT fits industrial control panels because its 7 KB OTP EPROM, 8-channel 8-bit ADC, 2 CCP PWM modules, and 25 mA sink/source GPIO deliver deterministic real-time control for relays, contactors, and indicator LEDs. Operating voltage of 2.5 V to 6.0 V accepts 24 V->5 V industrial bus rails after regulation, while the -40 C to +125 C Extended temperature grade survives factory floor environments. Its 35-instruction RISC core executes 1 us per instruction at 4 MHz, fast enough for closed-loop PID, encoder counting, and HMI scanning.
پیشنهادی
Automotive Body and Instrument Modules
Automotive body controllers, instrument cluster sub-modules, and HVAC flap actuators use the PIC16C74B-04E/PT for its 8-bit ADC that samples thermistors and potentiometers, plus 2 CCP channels for PWM-driven stepper motors and DC fans. The Extended -40 C to +125 C temperature grade meets under-hood and dashboard thermal requirements, while the OTP EPROM prevents post-production firmware theft, a common automotive requirement. Note that AEC-Q100 qualification is not formally listed; for OEM automotive designs consider PIC16F877A-I/PT or PIC18F family.
پیشنهادی
HVAC Fan and Blower Controllers
The PIC16C74B-04E/PT drives HVAC blower motors using 2 CCP PWM channels for closed-loop RPM control via tachometer feedback sampled through the 8-bit ADC. The 33 GPIO pins handle multiple switch inputs (mode selector, fan-speed knob, thermistor), keypad scanning for setpoint entry, and triac-fire outputs for compressor contactors. PIC16CXX mid-range architecture's predictable 200 ns interrupt latency (at 20 MHz) ensures jitter-free zero-crossing detection for triac dimming. The wide 2.5 V to 6.0 V supply range accepts post-transformer 5 V or 3.3 V rails from common HVAC power boards.
پیشنهادی
White-Goods Motor Control Front-Ends
Washing machines, dishwashers, and refrigerators embed PIC16C74B-04E/PT to manage brushless DC and universal motor commutation, water-level sensing, door-lock interlocks, and user-interface keypads. The 8-channel 8-bit ADC monitors motor current, supply voltage, and NTC temperature sensors for thermal protection; 2 CCP modules generate complementary PWM with dead-band control. With 25 mA per-pin drive the MCU directly powers relay coils and LED indicators. Extended temperature grade ensures reliability in cold-start refrigerator and freezer installations.
پیشنهادی
Legacy Embedded Systems and Maintenance Boards
The PIC16C74B-04E/PT remains a service part for industrial machinery, medical devices, and test equipment originally shipped in the late 1990s and 2000s. The OTP EPROM cannot be field-updated, so the part is restricted to maintenance spares, exact-form-fit replacements on existing PCBs, and form-fit-function retrofits where firmware is frozen. The 44-pin TQFP package matches original footprints exactly. XAIPART and authorized brokers maintain limited stock for these sustaining engineering programs, with traceable date codes and original Microchip packaging.
پیشنهادی
Educational and Trainer Platforms
Universities and technical colleges use PIC16C74B-04E/PT in microcontroller courses because the PIC16CXX mid-range family exposes every peripheral (ADC, timers, CCP, SPI/I2C, USART) without complexity overhead. The OTP-EPROM package forces students to plan firmware carefully, mirroring real engineering constraints. The 44-pin TQFP package is breadboard-friendly via carrier boards and supports In-Circuit Serial Programming (ICSP) for development. The wide operating voltage (2.5 V to 6.0 V) and standard 4 MHz resonator tolerates lab-bench power-supply variations, making it a robust teaching platform.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای PIC16C74B-04E/PT — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | PIC16F74-I/PT | PIC16F877A-04I/PT | PIC16C74B-04I/PT | PIC16C74B-20I/PT | PIC16F747-I/PT |
|---|---|---|---|---|---|---|
| Package | TQFP-44 (10x10 mm) | TQFP-44 - same | TQFP-44 - same | TQFP-44 - same | TQFP-44 - same | TQFP-44 - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 7 KB OTP EPROM | 4 KB Flash (-43%) | 14 KB Flash (+100%) | 7 KB OTP EPROM - same | 7 KB OTP EPROM - same | 7 KB Flash - same size |
| RAM Size | 192 bytes | 192 bytes - same | 368 bytes (+92%) | 192 bytes - same | 192 bytes - same | 192 bytes - same |
| Max CPU Frequency | 4 MHz | 20 MHz (+400%) | 20 MHz (+400%) | 4 MHz - same | 20 MHz (+400%) | 20 MHz (+400%) |
| Temperature Grade | Extended -40 to +125 C | Industrial -40 to +85 C | Industrial -40 to +85 C | Industrial -40 to +85 C | Industrial -40 to +85 C | Industrial -40 to +85 C |
| Memory Type | OTP EPROM | Flash (reprogrammable) | Flash (reprogrammable) | OTP EPROM - same | OTP EPROM - same | Flash (reprogrammable) |
| ADC Channels | 8 x 8-bit | 8 x 8-bit - same | 8 x 10-bit (improved) | 8 x 8-bit - same | 8 x 8-bit - same | 8 x 8-bit - same |
| Lifecycle Status | Obsolete | Active | Active | Obsolete | Obsolete | Active |
تفاوت‌های کلیدی
- Only Extended temperature grade (-40 to +125 C) in the PIC16C74B family (در مقابلPIC16C74B-04I/PT)
- Lowest-speed (and lowest-EMI) variant of the PIC16C74B family (در مقابلPIC16C74B-20I/PT)
- OTP EPROM anti-tamper security (در مقابلPIC16F74-I/PT)
- Smaller program memory than PIC16F877A upgrade path (در مقابلPIC16F877A-04I/PT)
یادداشت‌های طراحی
The PIC16C74B-04E/PT uses One-Time-Programmable EPROM: once programmed, the OTP region cannot be erased in the plastic TQFP-44 package. Only ceramic-windowed packages allow UV erasure. Design firmware assuming single-program sessions; for development, use the windowed CERDIP variant or the Flash-based PIC16F74-I/PT instead. Allocate a 5-10% code budget reserve to absorb late bug fixes without re-spinning the package.
Decouple the four VDD pins (11, 21, 31, 41) and four VSS pins (10, 20, 30, 40) with 100 nF X7R ceramic capacitors placed within 5 mm of each pair, plus a single 10 uF tantalum or aluminum bulk capacitor at the regulator output. The PIC16C74B draws typical 15 uA at 5V/4 MHz but can spike to tens of mA when all GPIO banks switch simultaneously; insufficient bulk capacitance will cause VDD droop and brown-out resets. Tie the MCLR/VPP pin (1) to VDD through a 10 kohm pull-up and to a 100 nF decoupling cap if ICSP is not used.
Route the OSC1 (pin 2) and OSC2 (pin 3) traces as short as possible, surrounded by ground pour, to minimize EMI coupling into adjacent analog inputs RA0-RA5. Place the 4 MHz crystal or resonator within 5 mm of the OSC pins and keep digital traces away from the analog VREF+ line on RA3. For ADC accuracy in noisy industrial environments, average 16 or 64 samples per conversion and use the dedicated VREF+ pin instead of VDD as the ADC reference. Cross-coupled noise on the VDD supply can otherwise inject several LSBs of error.
The TQFP-44 package has a thermal resistance of approximately 50 C/W (theta_JA) on a standard 4-layer JEDEC test board, far higher than the LQFP-44 form factor, so the part does not require a heatsink in typical embedded control applications. However, at the Extended -40 C to +125 C temperature range, derate system clock and GPIO toggle rate to keep junction temperature below the maximum. In enclosed industrial cabinets with no airflow, assume 10-15 C ambient rise and budget 100 C junction as the steady-state ceiling.
The USART pins RC6/TX and RC7/RX can drive signals directly only over short PCB traces; for off-board serial links above 10 cm, add a MAX232 or similar RS-232 line driver. The SPI clock pin RC3/SCK can run up to FOSC/4 (1 MHz at 4 MHz oscillator) in master mode, but long PCB traces above 5 cm should be series-terminated with 100 ohms to dampen ringing. The I2C pins RC3/SCL and RC4/SDA require external 4.7 kohm pull-ups to VDD; the PIC16C74B does not have internal I2C pull-ups, an easy-to-miss pitfall for engineers accustomed to modern PIC24/dsPIC parts.
اطلاعات انطباق
RoHS compliance status not explicitly stated in the verified web data; flagged as [DATA_NEEDED]. REACH and conflict-minerals compliance assumed per Microchip corporate policy. AEC-Q100 not formally qualified for automotive OEM programs; PIC16F877A-I/PT is the preferred automotive successor. Lead-free TQFP-44 packaging confirmed per Microchip product page.