PIC16C74A-04/PT - 8-bit MCU, 7KB OTP, 4MHz, 44-TQFP | Microchip
MPN: PIC16C74A-04/PT ✗ Cuối đờiPIC16C74A-04/PT Tóm tắt
Background knowledge: A microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, program memory (ROM/Flash/OTP), and peripherals such as timers, A/D converters, and communication interfaces. The PIC® 16C family from Microchip Technology is a mid-range 8-bit architecture introduced in the early 1990s that uses a 14-bit instruction word and a RISC-based Harvard bus structure, occupying the position PIC16C -> PIC® mid-range 8-bit -> 8-bit microcontroller -> microcontroller -> semiconductor device.
Key features of the PIC16C74A include 7 KB (4K x 14) OTP program memory, 192 bytes of data RAM, 33 bidirectional I/O pins, two 8-bit and one 16-bit timers, two Capture/Compare/PWM (CCP) modules, an 8-channel 8-bit A/D converter, USART for serial communication, and an SSP supporting SPI and I2C. The OTP memory makes this part well-suited to medium-volume production where in-system programmability is not required.
Technically, the PIC16C74A-04/PT uses a Harvard architecture with separate program and data buses, a 14-bit-wide instruction word, and a RISC-style instruction set. Its fully static CMOS design allows operation at clock speeds from DC to 4 MHz across the commercial 0°C to +70°C range. The 44-TQFP package provides approximately 31 C/W theta-JA thermal resistance suitable for industrial automation and embedded control.
Typical applications include industrial control panels, motor control, instrumentation, sensor interfacing, and consumer appliances requiring moderate on-chip integration. According to the PIC16C74A datasheet from Microchip, the integrated A/D converter and CCP/PWM modules also suit power conversion and lighting control.
Designers must note that the PIC16C74A uses EPROM/OTP memory, so code cannot be re-flashed; for development and field updates, the Microchip-recommended PIC16F74 (Flash) is the migration path.
This page consolidates distributor pricing, same-package alternatives, datasheet links, and design notes specific to the 44-TQFP PIC16C7x family, with comparison data not assembled in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC16C74A-04/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 PIC16C74A-04/PT (cùng hình factor và footprint) — khác nhau ở Package, ADC, Core Architecture, Watchdog Timer, Program Memory Size.
PIC16C74A-04I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74A-20/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74A-10/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74A-04E/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74A-04/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74B-04/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F74-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74A-04/PT Tỷ lệ tối đa & tính chất điện
| Family | PIC® 16C |
| Core Processor | PIC 8-bit |
| Core Size | 8-Bit |
| Program Memory Size | 7 KB (4K x 14) |
| Program Memory Type | OTP (One-Time Programmable) |
| RAM Size | 192 x 8 bytes |
| Number of I/O | 33 |
| Oscillator Type | External |
| Speed (Clock) | 4 MHz |
| Supply Voltage (Vcc/Vdd) | 4.0 V to 6.0 V (5V typical) |
| Nhiệt độ hoạt động | 0°C to +70°C (commercial) |
| A/D Converter | 8 channels x 8-bit |
| Timers | 2 x 8-bit + 1 x 16-bit |
| CCP/PWM Modules | 2 |
| Communication | USART + SSP (SPI / I2C) |
| Watchdog Timer | Yes |
| Hộp | 44-TQFP (PT) |
| Kiểu lắp đặt | Surface Mount |
Cấu hình chân PIC16C74A-04/PT
| Chân 1 | MCLR/Vpp — Master Clear (reset) input / programming voltage |
| Chân 2 | RA0/AN0 — PORTA bit 0 / Analog input channel 0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / Analog input channel 1 |
| Chân 4 | RA2/AN2 — PORTA bit 2 / Analog input channel 2 |
| Chân 5 | RA3/AN3/VREF — PORTA bit 3 / Analog input channel 3 / ADC reference |
| Chân 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 7 | RA5/AN4/SS — PORTA bit 5 / Analog input channel 4 / SPI slave select |
| Chân 8 | RE0/RD/AN5 — PORTE bit 0 / Read control / Analog input channel 5 |
| Chân 9 | RE1/WR/AN6 — PORTE bit 1 / Write control / Analog input channel 6 |
| Chân 10 | RE2/CS/AN7 — PORTE bit 2 / Chip select / Analog input channel 7 |
| Chân 11 | VDD — Positive supply voltage (5V) |
| 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 input |
| Chân 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 I/O |
| Chân 17 | RC2/CCP1 — PORTC bit 2 / CCP1 I/O |
| Chân 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 19 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 20 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 21 | RC6/TX/CK — PORTC bit 6 / USART transmit / USART clock |
| Chân 22 | RC7/RX/DT — PORTC bit 7 / USART receive / USART data |
| Chân 23 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| Chân 24 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| Chân 25 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| Chân 26 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| 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 | VSS — Ground reference |
| Chân 33 | RB0/INT — PORTB bit 0 / External interrupt input |
| 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 | VDD — Positive supply voltage (5V) |
| Chân 42 | VDD — Positive supply voltage (5V) |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC16C74A-04/PT phù hợp cho 6 Áp dụngs: Industrial Control Panels, Motor Control and PWM Drive, Instrumentation and Data Acquisition, Consumer Appliance Control, Sensor Interfacing and Signal Conditioning, Power Conversion and Lighting Control.
Industrial Control Panels
The PIC16C74A-04/PT fits industrial control panels where its 33 I/O pins, 8-channel 8-bit A/D converter, and two CCP/PWM modules provide direct interface to sensors, pushbuttons, and triac-driven loads. Its 4 MHz clock is sufficient for relay sequencing, HMI key scanning, and PID control loops at typical 100 Hz update rates. The integrated USART enables connection to operator-panel displays or PLC networks. Pin count, integrated ADC, and PWM resources match the needs of multi-zone temperature or motor-speed controllers in factory automation.
Được đề xuất
Motor Control and PWM Drive
The PIC16C74A-04/PT is well-suited to small brushed-DC and unipolar stepper motor control, where its two CCP/PWM modules generate complementary PWM outputs at the 4 MHz system clock. The 8-bit PWM resolution and 10-bit effective resolution via the ECCP mode are adequate for variable-speed fans, pumps, and valve actuators. 33 I/O pins support direction-control signals, current-sense A/D inputs, and H-bridge gate drive enable lines typical of low-voltage motor designs.
Được đề xuất
Instrumentation and Data Acquisition
The PIC16C74A-04/PT's integrated 8-channel 8-bit ADC and USART make it a fit for low-speed data acquisition front-ends, such as laboratory multimeters, sensor signal conditioners, and process monitors. Sampling multiple analog channels at rates up to approximately 20 ksps (with appropriate ADC clock setup) and transmitting via RS-232/RS-485 supports portable instrument designs. 192 bytes of RAM buffer small sample sets; OTP memory locks calibration constants at production.
Được đề xuất
Consumer Appliance Control
The PIC16C74A-04/PT's combination of OTP memory (low unit cost in volume), 33 I/O for keypad/display, and PWM for power-control fits consumer appliances such as washing machines, microwave ovens, and rice cookers. Its 4 MHz clock handles timed-cycle sequencing and user-interface scanning; CCP/PWM outputs drive triac gates, relays, or buzzer tones. OTP code-lock ensures the firmware cannot be reverse-engineered via in-system reads.
Được đề xuất
Sensor Interfacing and Signal Conditioning
The PIC16C74A-04/PT integrates 8 ADC channels and an SSP supporting SPI/I2C for direct connection to thermocouples via external amplifiers, pressure sensors with I2C output, and SPI-based accelerometers. The PIC16C7x core handles linearization, filtering, and threshold comparison in firmware, eliminating external DSP chips. Suitable for HVAC sensors, environmental monitors, and similar multi-signal embedded designs at 4 MHz.
Được đề xuất
Power Conversion and Lighting Control
The PIC16C74A-04/PT's two CCP/PWM modules can drive MOSFETs in low-power DC-DC converters, LED dimmers, and fluorescent lamp ballasts, while the ADC senses output voltage and current for closed-loop regulation. The 4 MHz clock supports PWM frequencies up to approximately 10 kHz with 10-bit resolution, suitable for switching regulators and LED drivers in the 50-200W range. OTP memory locks the firmware for production units.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C74A-04/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 | PIC16C74A-04I/PT | PIC16C74A-20/PT | PIC16C74A-10/PT | PIC16C74A-04E/PT | PIC16F74-I/PT |
|---|---|---|---|---|---|---|
| Package | 44-TQFP (PT) | 44-TQFP (PT) - same | 44-TQFP (PT) - same | 44-TQFP (PT) - same | 44-TQFP (PT) - same | 44-TQFP (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB Flash |
| Max Clock Speed | 4 MHz | 4 MHz | 20 MHz | 10 MHz | 4 MHz | 20 MHz |
| Operating Temperature | 0°C to +70°C | -40°C to +85°C | 0°C to +70°C | 0°C to +70°C | -40°C to +125°C | -40°C to +85°C |
| RAM Size | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| ADC Channels x Resolution | 8 x 8-bit | 8 x 8-bit | 8 x 8-bit | 8 x 8-bit | 8 x 8-bit | 8 x 8-bit |
| Memory Type | OTP (one-time) | OTP (one-time) | OTP (one-time) | OTP (one-time) | OTP (one-time) | Flash (re-programmable) |
Bảo phân biệt quan trọng
- 44-TQFP package with 33 I/O, the highest pin count in the PIC16C7x OTP family (vsPIC16C73B-04/SS (28-SSOP, 22 I/O))
- OTP memory code-lock for production units - cannot be reverse-engineered via in-system read (vsPIC16F74-I/PT (Flash, re-programmable))
- Drop-in replacement family with temperature and speed variants (vsPIC16C74A-04I/PT and PIC16C74A-20/PT)
Ghi chú thiết kế
The PIC16C74A-04/PT operates from 4.0V to 6.0V (5V typical); both VDD pins (11 and 41/42) must be connected and both VSS pins (12 and 31/32) grounded to share return current. Place a 0.1 µF ceramic decoupling capacitor within 5 mm of each VDD pin and a 10 µF bulk capacitor near the MCU. A reset supervisor (e.g., MCP100/MCP130) is recommended if VDD rise time exceeds the PIC16C7x power-on-reset specification.
Connect a 4 MHz crystal across OSC1 (pin 13) and OSC2 (pin 14) with appropriate load capacitors (typically 15-33 pF); verify with the PIC16C74A oscillator table for the exact C1/C2 values at 4 MHz. For higher noise immunity, use a four-pin crystal can rather than a two-pin SMD resonator. The MCLR pin (pin 1) must be pulled to VDD through a 10 kΩ resistor and have a 0.1 µF decoupling cap for in-circuit serial programming (ICSP).
PIC16C74A uses OTP program memory - once programmed, code cannot be re-flashed in-circuit; engineers targeting field-updatable firmware should migrate to PIC16F74-I/PT. The 4 MHz speed grade cannot run firmware loops requiring >1 MIPS (4 cycles per instruction); profile firmware before assuming the 4 MHz part will work. Configuration bits (fuses) determine oscillator mode and watchdog behavior; verify against the configuration-word table in the datasheet.
Thông tin tuân thủ
RoHS/REACH compliance not explicitly stated in verified web data for this OTP/legacy MPN; marked unknown. AEC-Q100 not applicable (not automotive qualified). Conflict-minerals compliance assumed per Microchip standard policy.