PIC16F874-04I/PT - 8-bit 7KB Flash MCU, 20MHz, TQFP-44 | Microchip
MPN: PIC16F874-04I/PT ⚠ Lần mua cuốiPIC16F874-04I/PT Tóm tắt
What is a PIC16F 8-bit microcontroller? The PIC16F family sits within the broader 8-bit microcontroller category, which in turn belongs to the microcontroller unit (MCU) sub-segment of embedded processors. Within Microchip's portfolio, PIC16F parts are mid-range MCUs that balance low power consumption, deterministic RISC execution, and rich on-chip peripherals; they share the PIC16 instruction set so firmware is portable across the 18-, 28-, and 40-/44-pin variants. Compared with 32-bit Cortex-M parts, PIC16F devices trade raw compute for lower BOM cost, simpler toolchains, and decades of legacy code.
Key features of the PIC16F874-04I/PT include 14 interrupt sources, a hardware 8x8 multiplier, nanoWatt power management with multiple idle/sleep modes, an internal oscillator option on some family members, and in-circuit serial programming (ICSP) via two pins. The integrated brown-out reset and power-on reset circuitry improve system robustness in industrial environments.
Architecturally, the part uses a Harvard RISC core with a single-cycle ALU and a 14-bit-wide instruction word. This yields deterministic 200 ns instruction execution at 20 MHz and predictable interrupt latency, which is critical in motor-control and real-time sensing loops.
Typical applications include industrial sensor nodes, motor-control (BLDC, stepper, brushed DC) front-ends, HVAC controllers, security and alarm panels, automotive body and chassis subsystems, smart metering, and consumer white-goods user-interface controllers. The wide 4.0-5.5 V input range and industrial-grade temperature profile also suit 24 V industrial bus systems when paired with an upstream switching pre-regulator.
When designing with this part, allocate a 10 kohm pull-up on the MCLR pin per the Microchip reference design and ensure decoupling is placed within 5 mm of the VDD/AVDD and VSS/AVSS pins. For new designs, evaluate the recommended migration path (PIC16F884) since Microchip flags this family as legacy.
Bộ thay thế dễ dàng lắp đặt cho PIC16F874-04I/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 PIC16F874-04I/PT (cùng hình factor và footprint) — khác nhau ở Package, Timers, Operating Temperature, Serial Interfaces, Core.
PIC16F874-04E/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16F874T-04I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F874-20I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F877-04I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F877-20I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16F884-I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F874-04I/PT Tỷ lệ tối đa & tính chất điện
| Family | PIC16F 8-bit mid-range MCU |
| Program Memory (Flash) | 7 KB |
| Data RAM | 192 bytes |
| Data EEPROM | 128 bytes |
| Maximum Clock Speed | 20 MHz (4 MHz marked in part number, family rating 20 MHz) |
| Instruction Cycle | 200 ns at 20 MHz |
| Supply Voltage (VDD) | 4.0 V to 5.5 V |
| I/O Pins | 33 |
| ADC | 10-bit, 8-channel |
| Timers | 2 x 8-bit, 1 x 16-bit |
| Communication | USART/SCI, MSSP (SPI / I2C master-slave) |
| CCP Modules | 1 x Capture/Compare/PWM |
| Nhiệt độ hoạt động | -40 C to +85 C (industrial, "I" suffix) |
| Hộp | 44-pin TQFP (PT) 10x10 mm |
| Brown-out Reset | Yes |
| ICSP | Yes (In-Circuit Serial Programming) |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC16F874-04I/PT
| Chân 1 | MCLR/VPP — Master clear (reset) input / programming voltage |
| Chân 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Chân 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / ADC VREF- |
| Chân 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC VREF+ |
| 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 for parallel port / analog input 5 |
| Chân 9 | RE1/WR/AN6 — PORTE bit 1 / write control for parallel port / analog input 6 |
| Chân 10 | RE2/CS/AN7 — PORTE bit 2 / chip select for parallel port / analog input 7 |
| Chân 11 | VDD — Positive supply (4.0-5.5 V) |
| Chân 12 | VSS — Ground |
| Chân 13 | OSC1/CLKI — Oscillator input / external clock input |
| Chân 14 | OSC2/CLKO — Oscillator output / clock output |
| Chân 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Chân 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| 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 transmit / USART clock |
| Chân 26 | RC7/RX/DT — PORTC bit 7 / USART receive / 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 |
| Chân 32 | VDD — Positive supply (4.0-5.5 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/PGM — PORTB bit 3 / low-voltage programming |
| 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 | AVSS — Analog ground |
| Chân 42 | AVDD — Analog positive supply |
| Chân 43 | NC — Not connected |
| Chân 44 | NC — Not connected |
Ứng dụng tiêu biểu
PIC16F874-04I/PT phù hợp cho 7 Áp dụngs: Industrial Sensor Node / Data Acquisition, Motor Control (BLDC / Stepper / Brushed DC), HVAC Controller (Thermostat / Damper Actuator), Security & Alarm Panel (PIR / Door / Siren Controller), Smart Metering (Electricity / Water / Gas Endpoint), Automotive Body & Chassis Subsystem, Consumer White-Goods User Interface (Washer / Oven / Fridge).
Industrial Sensor Node / Data Acquisition
The PIC16F874-04I/PT fits industrial sensor nodes because its 10-bit, 8-channel ADC, 4.0-5.5 V supply, and industrial -40 C to +85 C temperature range cover most factory-floor sensor requirements. The 192-byte RAM and 7 KB Flash are sufficient for periodic sensor reads, linearization, and Modbus or simple proprietary protocols over the USART. Placed between the analog front-end (op-amp + RC filter) and the RS-485 transceiver, the MCU runs at 20 MHz to deliver deterministic 200 ns instruction cycles, ensuring fixed sampling intervals for process control. The integrated MSSP supports SPI-based digital sensors (e.g., thermocouple-to-digital converters) while the USART drives the fieldbus. No external memory is required for typical 16-channel analog scanner firmware, simplifying the BOM.
Được đề xuất
Motor Control (BLDC / Stepper / Brushed DC)
The PIC16F874-04I/PT is well-suited to low-cost brushed-DC, stepper, and small BLDC motor controllers. The 16-bit timer with Capture/Compare/PWM (CCP) generates center-aligned PWM for H-bridge drivers, and the 200 ns instruction cycle at 20 MHz supports typical 20 kHz PWM frequencies with comfortable timing margins. The 33 I/O pins accommodate direction inputs, Hall sensor feedback, fault inputs, and an encoder interface; the 8-channel 10-bit ADC reads back EMF, current shunt, and potentiometer inputs. With 7 KB of Flash, the MCU fits a complete state-machine + PI loop firmware image. For brushed-DC and small steppers, no external gate driver is needed beyond discrete transistors.
Được đề xuất
HVAC Controller (Thermostat / Damper Actuator)
The PIC16F874-04I/PT powers HVAC thermostats, zone damper actuators, and fan-coil controllers due to its industrial temperature rating, 8-channel 10-bit ADC for NTC thermistor inputs, and PWM for triac-driven fan or damper control. The 7 KB Flash comfortably holds the user-interface state machine plus a PID loop, while the 192-byte RAM supports a small display buffer for 7-segment or 128x64 LCD driving via SPI. The MSSP (SPI/I2C) port connects to a temperature/humidity sensor such as an SHT20, and the USART links to a wired thermostat network or BACnet MS/TP bridge. At industrial-grade temperature and a 5 V supply, the MCU pairs naturally with 24 VAC-derived DC rails through a small buck regulator.
Được đề xuất
Security & Alarm Panel (PIR / Door / Siren Controller)
The PIC16F874-04I/PT serves as the central controller in PIR motion detector panels, door/window contact aggregators, and siren/keypad controllers. Its 33 I/O lines accept many discrete alarm loops and keypad matrix rows/columns, while the ADC monitors backup battery voltage and PIR analog outputs. The USART or MSSP links to a GSM dialer or IP communicator for remote alarm reporting. With 7 KB of Flash, the MCU stores the zone-arm state machine, debounce, and event log. The brown-out reset and watchdog timer provide the robustness required for unattended 24/7 operation. Power is typically 12 V sealed-lead-acid battery with a 5 V regulator.
Được đề xuất
Smart Metering (Electricity / Water / Gas Endpoint)
The PIC16F874-04I/PT fits electronic meter endpoints for electricity, water, or gas where cost and reliability matter more than MIPS. Its 8-channel 10-bit ADC handles voltage/current sensing or pulse-counter inputs from a flow meter, while the USART or MSSP communicates with the concentrator over PLC, RF, or wired M-Bus. The 7 KB Flash holds the metrology algorithm, calibration constants, and DLMS/COSEM or simple OBIS protocol stack. NanoWatt sleep modes drop quiescent current for battery-powered water/gas meters, where 1-2 uA standby extends coin-cell life to >10 years. The industrial temperature range ensures operation in outdoor meter enclosures from -40 C to +85 C.
Được đề xuất
Automotive Body & Chassis Subsystem
Although not AEC-Q100 qualified, the PIC16F874-04I/PT is widely deployed in non-safety automotive body modules such as door/window lift controllers, seat position memories, mirror adjusters, and accessory lighting controllers. The 33 I/O lines drive relay coils and read limit switches; the 16-bit timer with CCP generates PWM for mirror actuators and dimmed interior lighting. The 10-bit ADC samples potentiometer (for seat position feedback) and supply voltage. With 7 KB of Flash, the MCU implements the body-control state machine with debounced inputs and latched outputs. Power is typically 12 V vehicle battery through a 5 V regulator, and the MCU tolerates load-dump transients with external TVS clamping.
Được đề xuất
Consumer White-Goods User Interface (Washer / Oven / Fridge)
The PIC16F874-04I/PT drives the user interface and main control loop in entry-level and mid-range consumer appliances such as washing machines, microwave ovens, refrigerators, and dishwashers. The 33 I/O lines accept a 4x4 keypad matrix plus LED indicators; the MSSP drives a character LCD; and the 10-bit ADC reads thermistor inputs (NTC) for oven or refrigerator temperature regulation. The 7 KB Flash accommodates the user-interface menu, wash-cycle state machine, and basic fault diagnostics without external memory. The 16-bit CCP provides PWM for buzzer tones and triac-based heater control, while the USART connects to a service-diagnostic port or a Bluetooth module for smart-appliance variants.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16F874-04I/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 | PIC16F874-04E/PT | PIC16F874T-04I/PT | PIC16F874-20I/PT | PIC16F877-04I/PT | PIC16F877-20I/PT | PIC16F884-I/PT |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin TQFP (PT) 10x10 mm | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same |
| Program Memory (Flash) | 7 KB | 7 KB | 7 KB | 7 KB | 14 KB | 14 KB | 14 KB |
| Data RAM | 192 B | 192 B | 192 B | 192 B | 368 B | 368 B | 368 B |
| Maximum Clock Speed | 20 MHz (4 grade) | 20 MHz (4 grade) | 20 MHz (4 grade) | 20 MHz (20 grade) | 20 MHz (4 grade) | 20 MHz (20 grade) | 20 MHz |
| Operating Temperature | -40C to +85C (industrial) | -40C to +125C (extended) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) |
| ADC | 10-bit, 8-channel | 10-bit, 8-channel | 10-bit, 8-channel | 10-bit, 8-channel | 10-bit, 8-channel | 10-bit, 8-channel | 10-bit, 14-channel (enhanced) |
| Lifecycle Status | Last-time-buy (recommended migration: PIC16F884) | Last-time-buy | Last-time-buy | Last-time-buy | Last-time-buy | Last-time-buy | Active |
Bảo phân biệt quan trọng
- Industrial temperature grade with recommended migration path to active part (vsPIC16F884-I/PT)
- Higher Flash and RAM headroom as pin-compatible superset (vsPIC16F877-04I/PT)
- Full 20 MHz timing guarantee across industrial temperature range (vsPIC16F874-20I/PT)
Ghi chú thiết kế
Place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD/AVDD pin (pins 11, 32, 42 on the 44-pin TQFP) and a single 10 uF bulk capacitor at the regulator output. Per the Microchip PIC16F874 datasheet, AVDD must be tied to VDD and AVSS to VSS for correct ADC operation. Estimated: at 20 MHz the core draws roughly 10-15 mA plus I/O drive, so size the regulator for at least 50 mA peak to accommodate port-toggle transients.
The MCLR pin (pin 1) requires a 10 kohm pull-up to VDD for normal operation; do not leave it floating or the device will randomly reset. For ICSP programming, route the PGC (RB6) and PGD (RB7) pins (pins 39, 40) directly to a programming header - avoid series resistors > 100 ohm that block in-circuit programming. The "-04" speed grade is rated for 4 MHz guaranteed operation; for 20 MHz designs use the "-20" grade variant or accept out-of-spec behavior.
Keep analog (PORTA/AVDD/AVSS) traces away from switching nodes such as the PWM CCP1 output (RC2, pin 17) and the oscillator pins (OSC1/OSC2, pins 13/14) to minimize ADC coupling noise. Use a ground pour under the MCU with stitching vias between VSS and AVSS to provide a Kelvin return for ADC conversions. For crystal operation, route the crystal within 10 mm of OSC1/OSC2 and surround the traces with a ground guard ring; do not route signal traces under the crystal.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - the part is targeted at industrial and consumer applications, not automotive safety-critical systems. Microchip's QS-9000 quality system certification covers the manufacturing facility.