PIC16F74T-I/PT - 8-Bit 20MHz 7KB Flash MCU 44-TQFP | Microchip
MPN: PIC16F74T-I/PT ✓ Hoạt độngPIC16F74T-I/PT Tóm tắt
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, data RAM, and peripheral subsystems such as timers, communication interfaces, and analog blocks. Microcontrollers sit within the broader embedded system hierarchy as integrated circuits > microcontrollers > 8-bit MCUs > PIC16 family, and serve as the central processing unit in countless embedded designs. The PIC architecture uses a RISC-style Harvard core with only 35 single-word instructions, which simplifies firmware development and accelerates time-to-market.
The PIC16F74T-I/PT features 8 channels of 8-bit Analog-to-Digital conversion, two additional 8-bit timers, a 16-bit timer/counter, a synchronous serial port (SSP) supporting SPI and I2C, a universal synchronous/asynchronous receiver-transmitter (USART), and a capture/compare/PWM (CCP) module. Operating voltage is 4 to 5.5 V, and the industrial temperature grade (-40C to +85C) suits commercial and industrial environments.
From an architectural standpoint, the PIC16F74T-I/PT shares the same Harvard RISC core as the PIC16F73/76/77 family, offering upwards code compatibility with PIC16C5X, PIC12CXXX, and PIC16C7X predecessors. In-system programmability via ICSP allows field firmware updates without removing the device. The 13-channel 8-bit ADC and 33 I/O pins make the part a flexible mid-range controller for mixed-signal designs.
The "T" suffix denotes tape-and-reel packaging for high-volume assembly, while "I" designates the industrial temperature grade. Typical applications include industrial control, HVAC fan/temperature regulation, consumer appliance control, motor control, instrumentation front-ends, and home automation. The PIC16F74T-I/PT is best suited to designs that require more I/O and ADC channels than 28-pin PIC16F73/76 but do not need the larger memory of the PIC16F77.
When designing with the PIC16F74T-I/PT, ensure the MCLR pin is properly pulled high through a 10 kohm resistor for normal operation, and reserve two I/O pins (RB6/RB7) for in-circuit serial programming (ICSP). The PIC16F74 family is now a mature part; verify long-term supply and consider the pinout-function alternatives listed on this page for new designs.
This page synthesizes distributor pricing, drop-in alternatives sourced from the Microchip same-family cross-reference and verified web data, plus practical design notes that go beyond the manufacturer datasheet summary, enabling engineers to evaluate the part for new designs and maintenance scenarios.
Bộ thay thế dễ dàng lắp đặt cho PIC16F74T-I/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 PIC16F74T-I/PT (cùng hình factor và footprint) — khác nhau ở Package, Core Architecture, Serial Interfaces, Timers, ADC.
PIC16F77-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F74-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F74T-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F747-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F74T-E/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F76-I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F74T-I/PT Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Program Memory | 7 KB (4K x 14 words) Flash |
| Data RAM | 192 bytes |
| Maximum CPU Speed | 20 MHz (200 ns instruction cycle) |
| Operating Voltage | 4 V to 5.5 V |
| I/O Pins | 33 |
| ADC | 8 channels, 8-bit |
| Timers | 2 x 8-bit + 1 x 16-bit |
| Communication | USART/SCI, SSP (SPI/I2C) |
| CCP Modules | 1 (Capture/Compare/PWM) |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial grade) |
| Hộp | 44-pin TQFP (10x10 mm) |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 3 |
| In-Circuit Programming | ICSP via RB6/RB7 |
Cấu hình chân PIC16F74T-I/PT
| Chân 1 | MCLR/VPP/THV — Master Clear reset input / programming voltage input |
| Chân 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Chân 4 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| Chân 5 | RA3/AN3/VREF — PORTA bit 3 / analog input 3 / ADC voltage reference |
| Chân 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 7 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI slave select |
| Chân 8 | RE0/RD/AN5 — PORTE bit 0 / read control / analog input 5 |
| Chân 9 | RE1/WR/AN6 — PORTE bit 1 / write control / analog input 6 |
| Chân 10 | RE2/CS/AN7 — PORTE bit 2 / chip select / analog input 7 |
| Chân 11 | VDD — Positive supply voltage (4.0 V to 5.5 V) |
| Chân 12 | VSS — Ground reference |
| Chân 13 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Chân 14 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Chân 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock |
| Chân 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Chân 17 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Chân 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 19 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| Chân 20 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| Chân 21 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| Chân 22 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| Chân 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 25 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| Chân 26 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Chân 27 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| Chân 28 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| Chân 29 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| Chân 30 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| Chân 31 | VSS — Ground reference |
| Chân 32 | VDD — Positive supply voltage (4.0 V to 5.5 V) |
| Chân 33 | RB0/INT — PORTB bit 0 / external interrupt |
| Chân 34 | RB1 — PORTB bit 1 |
| Chân 35 | RB2 — PORTB bit 2 |
| Chân 36 | RB3 — PORTB bit 3 |
| Chân 37 | RB4 — PORTB bit 4 |
| Chân 38 | RB5 — PORTB bit 5 |
| Chân 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 40 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 41 | VSS — Ground reference |
| Chân 42 | VDD — Positive supply voltage (4.0 V to 5.5 V) |
| Chân 43 | VSS — Ground reference |
| Chân 44 | VDD — Positive supply voltage (4.0 V to 5.5 V) |
Ứng dụng tiêu biểu
PIC16F74T-I/PT phù hợp cho 6 Áp dụngs: Industrial Process Control, HVAC Fan and Temperature Regulation, Consumer Appliance Control, Motor Control and PWM Drive, Instrumentation Front-End, Home Automation and Smart Lighting.
Industrial Process Control
The PIC16F74T-I/PT's 33 I/O pins and 8-channel 8-bit ADC suit industrial control panels that read multiple analog sensors (temperature, pressure, flow) while driving relays, solenoids, and indicator LEDs. With 7 KB Flash, the firmware comfortably fits typical PID-loop controllers, Modbus RTU slaves, and HMI keypad handlers. The 20 MHz CPU executes 5 MIPS, fast enough for 1 ms control loops. The USART provides RS-232/RS-485 networking to a master PLC or HMI; the SSP block adds I2C/SPI for sensor front-ends and EEPROM. The industrial -40 C to +85 C grade is rated for factory-floor enclosures without additional thermal management, simplifying cabinet design.
Được đề xuất
HVAC Fan and Temperature Regulation
Variable-speed HVAC fans require a controller that can read NTC thermistors, drive TRIACs or PWM outputs, and time the compressor duty cycle. The PIC16F74T-I/PT's 8 ADC channels handle supply-air, return-air, and outdoor-air sensors simultaneously, while its 16-bit timer drives the PWM fan control loop with high resolution. The CCP module generates the variable-frequency PWM needed for brushless-DC fans, and the 7 KB Flash stores the entire climate-control state machine plus fault-and-tremperature regulation curves. The 4.0 V to 5.5 V supply range lets the part share the fan-driver's 5 V rail without an extra LDO.
Được đề xuất
Consumer Appliance Control
Washing machines, dishwashers, and coffee machines need an inexpensive 8-bit MCU that can multiplex a 7-segment display, scan a keypad, drive relays, and time motor cycles. The PIC16F74T-I/PT fits this role with its 33 I/O driving the display, keypad, water valves, and door-lock solenoid without external I/O expanders. The 192 bytes RAM hold the wash-program state machine, while the 7 KB program Flash fits the entire appliance firmware including Modbus or BLE interface routines. The ICSP capability allows field firmware updates during service, reducing warranty returns. The TQFP-44 package is small enough for the compact main board of slim-line appliances.
Được đề xuất
Motor Control and PWM Drive
Small BLDC and brushed-DC motor controllers benefit from the PIC16F74T-I/PT's 16-bit timer, CCP module, and 5 MIPS throughput. The firmware can implement field-oriented control (FOC) entry loops or simple trapezoidal commutation for low-voltage fans and pumps. The USART provides a debug console, and the SSP block interfaces to external gate drivers via SPI. Eight ADC channels read back-emf, current-sense, and potentiometer inputs simultaneously. The 33 I/O drive six PWM channels (using CCPP and timer compare) for 3-phase low-voltage motor control.
Được đề xuất
Instrumentation Front-End
Digital multimeters, panel meters, and bench-top instruments use the PIC16F74T-I/PT as the user-interface and measurement controller. The 8-channel ADC reads voltage, current, and temperature inputs; the USART drives an isolated RS-485 link to a host PC. The 7 KB Flash fits the calibration tables and UI state machine; the 192 bytes RAM holds measurement history. The industrial temperature grade ensures stable readings in lab environments. The ICSP pins allow firmware updates as new measurement ranges are added.
Được đề xuất
Home Automation and Smart Lighting
Smart switches, dimmers, and occupancy sensors integrate nicely with the PIC16F74T-I/PT's 8-channel ADC (for light sensors, potentiometers, and current sensing), 33 I/O (for keypad, LEDs, and relay drive), and USART (for serial communication with a host gateway). The 5 MIPS throughput handles real-time dimming curves and zero-cross detection for TRIAC dimmers without dedicated dimming ICs. The 7 KB Flash fits the entire device firmware including the wireless co-processor interface. The TQFP-44 package fits behind a standard wall switch footprint.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16F74T-I/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 | PIC16F77-I/PT | PIC16F74-I/PT | PIC16F74T-I/ML | PIC16F747-I/PT | PIC16F74T-E/ML | PIC16F76-I/PT |
|---|---|---|---|---|---|---|---|
| Package | 44-pin TQFP (10x10 mm) | 44-pin TQFP - same | 44-pin TQFP - same | 44-pin TQFP - same | 44-pin TQFP - same | 44-pin TQFP - same | 44-pin TQFP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 7 KB Flash | 14 KB Flash | 7 KB Flash | 7 KB Flash | 7 KB Flash | 7 KB Flash | 14 KB Flash |
| Data RAM | 192 bytes | 368 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 368 bytes |
| ADC Resolution | 8-bit | 8-bit | 8-bit | 8-bit | 10-bit | 8-bit | 8-bit |
| ADC Channels | 8 | 8 | 8 | 8 | 8 | 8 | 5 |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 | 22 |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C (Extended) | -40 C to +85 C |
Bảo phân biệt quan trọng
- Larger program memory than PIC16F74 base part for code growth (vsPIC16F77-I/PT)
- Higher ADC resolution for precision measurement applications (vsPIC16F747-I/PT)
- Extended temperature grade for harsh environment deployment (vsPIC16F74T-E/ML)
- Lower cost at same performance in tray packaging (vsPIC16F74-I/PT)
Ghi chú thiết kế
Estimated: The PIC16F74T-I/PT draws approximately 2 mA active at 5 V / 20 MHz and 1 uA in sleep mode. Place a 100 nF decoupling capacitor on each VDD pin (11, 32, 42, 44) close to the package, plus a 10 uF bulk capacitor on the 5 V rail within 25 mm. The MCLR pin (1) requires a 10 kohm pull-up to VDD; if ICSP is used, route PGC (pin 39) and PGD (pin 40) away from switching signals to prevent programming glitches.
Reserved ICSP pins: RB6 (pin 39) and RB7 (pin 40) are used for in-circuit serial programming and cannot be repurposed as outputs when ICSP is enabled - driving them low during programming prevents the device from entering programming mode. The PIC16F74 family is built on a 5 V process; operating below 4.0 V causes Flash read errors and brown-out resets. The MCLR pin must NOT be left floating, as noise can trigger spurious resets. Use CONFIG register settings to disable LVP if RB4 is needed as a general-purpose I/O.
Estimated: The 44-pin TQFP has a 0.8 mm pitch. Use a 4-layer PCB with a continuous ground plane under the part for thermal spreading and EMI reduction. Place the 20 MHz crystal within 10 mm of pins 13 and 14, with the load capacitors (typically 22 pF) close to the crystal case. Route the analog inputs (RA0-RA5, RE0-RE2) away from the USART and PWM signals to avoid ADC noise coupling; a guard trace tied to AVSS around the analog pins reduces digital switching noise.
Pin 1 (MCLR) orientation is at the top-left of the TQFP with the orientation marker (pin-1 dot). The VDD pins (11, 32, 42, 44) are distributed around the perimeter - do not skip any during layout, since each powers a separate internal logic block. Reserve a 5-pin header on the PCB for ICSP access (MCLR, VDD, VSS, PGC, PGD) to allow field firmware updates without rework. Avoid using PORTE (pins 8-10) for digital I/O if PSP mode is active, since PSP controls override the digital driver.
Thông tin tuân thủ
RoHS and REACH compliance per Microchip product page. Not AEC-Q100 qualified; choose PIC16F74T-E/ML (extended temperature) or PIC16F7xx with automotive grade for AEC-Q100 applications.