PIC16F874T-04I/L - 8-bit Flash MCU, 7KB, 44-PLCC | Microchip
MPN: PIC16F874T-04I/L ⚠ Lần mua cuốiPIC16F874T-04I/L Tóm tắt
What is an 8-bit Flash microcontroller? An 8-bit Flash MCU is a single-chip computer that fetches, decodes, and executes instructions on an 8-bit data path, with non-volatile Flash memory holding the user program. The PIC16F874 belongs to the mid-range PIC family (PIC16 -> PIC mid-range MCU -> 8-bit microcontroller -> microcontroller -> semiconductor), positioned between baseline PIC10/12 devices and the high-performance PIC18 family. It is widely used in industrial control, instrumentation, and embedded consumer designs that require ADC, PWM, and serial communication peripherals.
Key features include 5 channels of 10-bit Analog-to-Digital Conversion (ADC), two 8-bit timers plus one 16-bit timer, a USART module, a Master Synchronous Serial Port (MSSP) supporting SPI and I2C, a Capture/Compare/PWM (CCP) module, and a parallel slave port for external bus interfacing. The industrial (-40C to +85C) operating temperature grade, 4V to 5.5V supply range, and 20 MHz maximum clock speed make the PIC16F874T-04I/L well suited for factory and process control.
The PIC16F874T-04I/L uses a Harvard-architecture RISC core with 35 single-word instructions, providing deterministic interrupt latency and predictable code execution. The integrated nanoWatt Technology features multiple idle and sleep modes with sub-microampere standby currents, enabling battery-backed industrial sensor nodes and remote instrumentation that must operate for years on a single cell.
Typical applications include industrial automation controllers, HVAC blower and damper controls, sensor signal conditioning front-ends, motor-drive interface logic, and user-interface panels with LED or LCD displays. The parallel slave port also allows the device to operate as a peripheral to a host CPU in larger systems.
When designing with this part, place decoupling capacitors (100 nF ceramic plus 10 uF bulk) within 5 mm of VDD/VSS pairs and reserve the MCLR pin for a proper reset network. The 44-PLCC footprint requires a socket for in-field firmware updates or bench prototyping. PIC16F874 is at end-of-life; Microchip recommends the pin-compatible PIC16F884 as the modern replacement.
Bộ thay thế dễ dàng lắp đặt cho PIC16F874T-04I/L — 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 PIC16F874T-04I/L (cùng hình factor và footprint) — khác nhau ở Package, Timers, Core Architecture, Operating Temperature, ADC.
PIC16F874-04I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F874-04/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F874T-04E/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F874A-04I/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F874A-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F884-E/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F877-04I/L
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Xem tài liệu →PIC16F874T-04I/L Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC16 enhanced 8-bit RISC |
| Program Memory (Flash) | 7 KB |
| RAM | 192 bytes |
| EEPROM Data Memory | 128 bytes |
| Tần số xung maksimum | 20 MHz |
| Instruction Cycle Time | 200 ns |
| Supply Voltage (VDD) | 4.0 V to 5.5 V |
| I/O Pins | 33 |
| ADC | 10-bit, 8 channels |
| Timers | 2 x 8-bit + 1 x 16-bit |
| CCP/PWM Modules | 1 CCP, 1 Enhanced CCP |
| Communication Interfaces | USART, SSP (SPI / I2C), Parallel Slave Port |
| Hộp | 44-pin PLCC (J-lead, J-Lead) |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Kiểu lắp đặt | Surface Mount (PLCC socket compatible) |
Cấu hình chân PIC16F874T-04I/L
| 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 — PORTA bit 2 / Analog input 2 |
| 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 / Parallel Read / Analog input 5 |
| Chân 9 | RE1/WR/AN6 — PORTE bit 1 / Parallel Write / Analog input 6 |
| Chân 10 | RE2/CS/AN7 — PORTE bit 2 / Parallel Chip Select / Analog input 7 |
| Chân 11 | VDD — Positive supply (5 V) |
| Chân 12 | VSS — Ground reference |
| Chân 13 | OSC1/CLKIN — Crystal oscillator input / external clock in |
| Chân 14 | OSC2/CLKOUT — Crystal oscillator output / clock out (Fosc/4) |
| Chân 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / Timer1 clock in |
| Chân 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 I/O |
| Chân 17 | RC2/CCP1 — PORTC bit 2 / Enhanced CCP1 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 (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 ICSP programming |
| Chân 37 | RB4 — PORTB bit 4 |
| Chân 38 | RB5 — PORTB bit 5 |
| Chân 39 | RB6/PGC — PORTB bit 6 / In-circuit debugger clock |
| Chân 40 | RB7/PGD — PORTB bit 7 / In-circuit debugger data |
| Chân 41 | VSS — Ground reference (PLCC only) |
| Chân 42 | VDD — Positive supply 5 V (PLCC only) |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC16F874T-04I/L phù hợp cho 6 Áp dụngs: Industrial Automation Controllers, HVAC Blower and Damper Controls, Sensor Signal Conditioning Front-Ends, User Interface Panels with LED/LCD Displays, Small Brushed-DC Motor Drive Interface, Remote Instrumentation / Battery Sensor Nodes.
Industrial Automation Controllers
The PIC16F874T-04I/L fits industrial automation controllers because its 33 GPIO pins and 8-channel 10-bit ADC can directly interface to limit switches, 4-20 mA loop transmitters, and discrete sensors without external multiplexing. Its 5 V operating range tolerates long backplane wiring while the industrial -40C to +85C grade handles cabinet thermal rise. The 20 MHz core executes PID loops at sub-millisecond rates and the MSSP/USART peripherals connect to Modbus RTU slaves or HMI displays. With 7 KB of Flash, engineers can implement bootloaders for in-field firmware updates via RS-485, and the 192-byte RAM is sufficient for queueing serial frames between the USART and the application loop.
Được đề xuất
HVAC Blower and Damper Controls
HVAC systems use the PIC16F874T-04I/L to drive triac-fired blower motors and modulating damper actuators via the Enhanced CCP module, which generates zero-cross-synchronized PWM at line frequency. The on-chip 10-bit ADC reads duct temperature sensors and pressure transducers with 4.88 mV LSB at 5 V VDD, while the 16-bit Timer1 can capture tachometer pulses from Hall-effect fan-speed sensors. nanoWatt sleep modes drop current below 1 uA during off-hours, satisfying ENERGY STAR standby budgets. The 44-PLCC socketed package simplifies service replacement in installed HVAC units.
Được đề xuất
Sensor Signal Conditioning Front-Ends
The PIC16F874T-04I/L serves as a low-cost front-end for multi-sensor conditioning modules because its 8-channel ADC supports simultaneous monitoring of strain gauges, thermistors, and load cells. Internal bandgap reference (with external capacitor) yields 10-bit absolute accuracy adequate for weigh-scale displays up to 0.1 percent FS. The MSSP in I2C mode can read a digital temperature sensor or EEPROM for calibration constants, and USART streams results to a host PLC. Industrial temperature grade and 5 V tolerance permit deployment near motors and solenoids.
Được đề xuất
User Interface Panels with LED/LCD Displays
User-interface panels benefit from the PIC16F874T-04I/L's 33 GPIO that drive multiplexed 7-segment LED arrays, character LCD modules (HD44780), or keypad matrices without external logic. The Parallel Slave Port allows an attached host CPU to write display data directly into the PIC's I/O register space, offloading refresh work from the main processor. The 7 KB Flash is enough to hold bitmap fonts and key-debounce state machines, while nanoWatt idle mode keeps panel standby power below 50 uA. The 44-PLCC socket permits fast factory rework.
Được đề xuất
Small Brushed-DC Motor Drive Interface
The PIC16F874T-04I/L is well matched to brushed-DC motor control boards under 200 W because its Enhanced CCP module produces complementary PWM with programmable dead time at up to 39 kHz with 10-bit resolution from a 20 MHz oscillator. The 10-bit ADC samples shunt current at 50 kS/s for cycle-by-cycle current limiting, while the 16-bit Timer1 indexes the commutation timing for quadrature encoder feedback. The PIC16F874 industrial temperature grade tolerates the thermal environment near power MOSFETs, and the PLCC-44 package simplifies lab bring-up in a socketed fixture.
Được đề xuất
Remote Instrumentation / Battery Sensor Nodes
Battery-powered remote instrumentation uses the PIC16F874T-04I/L because nanoWatt Technology sleep currents below 1 uA enable multi-year deployments on 2x AA cells with a boost converter. The 10-bit ADC monitors battery voltage and environmental sensors, while the USART wakes only on a periodic measurement or external interrupt to transmit via a connected radio module. The 192-byte RAM buffers telemetry frames between transmissions, and the 128-byte EEPROM logs calibration constants and event timestamps. Industrial -40C to +85C operation supports outdoor weather stations and pipeline monitors.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16F874T-04I/L — 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 | PIC16F874-04I/L | PIC16F874A-04I/L | PIC16F874T-04E/L | PIC16F877-04I/L |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same |
| Flash Program Memory | 7 KB | 7 KB | 14 KB (+100%) | 7 KB | 14 KB (+100%) |
| RAM | 192 bytes | 192 bytes | 368 bytes (+92%) | 192 bytes | 368 bytes (+92%) |
| EEPROM | 128 bytes | 128 bytes | 256 bytes | 128 bytes | 256 bytes |
| Maximum Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| I/O Pins | 33 | 33 | 33 | 33 | 33 (40-pin DIP family) |
| ADC Channels | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit |
| Operating Temperature | -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 |
| Lifecycle Status | Last-time-buy | Last-time-buy | Active | Last-time-buy | Last-time-buy |
Bảo phân biệt quan trọng
- Higher memory variant in same package (vsPIC16F874A-04I/L)
- Extended temperature range option (vsPIC16F874T-04E/L)
- Tube-packaging sibling for prototyping (vsPIC16F874-04I/L)
- Microchip-recommended modern successor (vsPIC16F884-E/ML)
Ghi chú thiết kế
Place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD/VSS pair (the 44-PLCC provides three pairs on pins 11/12, 31/32, and 41/42). Add a single 10 uF bulk tantalum or ceramic on the VDD rail near the IC. The PIC16F874T-04I/L draws about 5 mA at 5 V/20 MHz in active mode and below 1 uA in sleep; verify regulator headroom if the supply is shared with relays or LEDs.
MCLR (pin 1) must NOT be left floating - tie it to VDD through a 10 kohm pull-up and a 100 nF cap to ground for a proper POR delay. Brown-out reset (BOR) should be enabled in CONFIG1 for industrial deployments; without it the part may execute undefined code during supply dips. The RB3/PGM pin is only sampled at reset for low-voltage ICSP entry - do not load it with heavy capacitance or the LVP handshake will fail.
Route the crystal traces (OSC1/OSC2, pins 13/14) as short, symmetric loops and guard them with a ground ring to prevent digital switching noise from coupling into the oscillator. The Parallel Slave Port lines (PORTD, PORTE) should be length-matched if the bus runs above 4 MHz to avoid setup/hold violations on the host side. Place the ICSP header (PGC/PGD on RB6/RB7) at the board edge for in-circuit programming access.
Estimated: at 20 MHz, 5 V VDD and full GPIO toggling, the PIC16F874T-04I/L dissipates approximately 250 mW worst-case, giving a junction temperature rise of roughly 25 C above ambient on a 100 C/W PLCC-44 footprint (estimated, not datasheet-measured). Inductive loads or relay coils near the MCU should be snubbed to keep local ambient below 70 C for long-term reliability in industrial enclosures.
Thông tin tuân thủ
RoHS and REACH compliance per Microchip product declaration. PIC16F874T-04I/L is industrial temp grade, not AEC-Q100 qualified - for automotive choose PIC16F874-04E/L or PIC16F884 extended variants.
