PIC16LC74AT-04I/PQ - 8-Bit 4MHz MCU, 7KB OTP, 44-MQFP | Microchip
MPN: PIC16LC74AT-04I/PQ ✗ Cuối đờiPIC16LC74AT-04I/PQ Tóm tắt
A microcontroller (MCU) is a single-chip computer containing a CPU core, program and data memory, I/O peripherals, and often analog interfaces. The PIC16C family is Microchip's mid-range 8-bit architecture using a Harvard RISC core with a 14-bit instruction word, well-suited to deterministic real-time control in industrial, automotive, and consumer applications. The PIC16LC74A series specifically targets low-voltage (2.5V-6V) operation with integrated ADC, making it a compact system-on-chip for cost-sensitive embedded designs.
Key features include 4MHz clock speed, an integrated 8-bit ADC with five input channels, three serial communication interfaces (I2C, SPI, USART), and 33 digital I/O pins. Brown-out Reset (BOR) and Power-On Reset (POR) protect code execution during supply transients. The wide 2.5V to 6V supply range simplifies integration into 3.3V and 5V systems. The 'LC' suffix denotes the low-power CMOS process, and the 'I' grade indicates industrial temperature range (-40C to +85C).
The device uses an OTP EPROM program memory architecture, programmed once via Microchip's ICSP interface. The 192-byte RAM is sufficient for small data buffers and stack operations in control loops. The mid-range 14-bit instruction set provides 35 single-word instructions and a 2-level hardware stack. With 33 I/O pins, this MCU can drive keypads, LCDs, and sensor interfaces directly.
Typical applications include industrial automation controllers, consumer electronics, automotive body electronics, HVAC control systems, and low-cost sensor interface boards. The combination of integrated ADC, multiple serial interfaces, and OTP memory makes it well suited to fixed-function appliances and instrumentation.
When designing with this MCU, note that OTP memory cannot be erased - use the windowed CERDIP version for development and OTP for production. A 20 MHz oscillator can be used with the internal PLL not present on this part - clock input drives the instruction cycle directly at Fosc/4. Ensure decoupling capacitors are placed close to VDD/VSS pins.
This page synthesizes distributor availability, parametric drop-in alternatives, and practical design notes not aggregated on any single manufacturer page.
Bộ thay thế dễ dàng lắp đặt cho PIC16LC74AT-04I/PQ — 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 PIC16LC74AT-04I/PQ (cùng hình factor và footprint) — khác nhau ở Package, ADC, Communication Interfaces, Program Memory Type, Operating Temperature Range.
PIC16LC74A-04/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC74AT-04/PQ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16LC65BT-04I/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC65B-04/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC65AT-04I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16LC65A-04I/PQ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16LC64AT-04I/L
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16LC74AT-04I/PQ Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC16C (8-bit Harvard RISC) |
| Instruction Set Width | 14-bit |
| Tần số xung maksimum | 4 MHz |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 7 KB (4K x 14) |
| RAM Size | 192 bytes |
| EEPROM Data Memory | None |
| ADC | 5 channels x 8-bit |
| Supply Voltage Range | 2.5 V to 6 V |
| I/O Pins | 33 |
| Communication Interfaces | I2C, SPI, UART/USART |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Hộp | 44-pin MQFP (10x10 mm) |
| Kiểu lắp đặt | Surface Mount |
| Process Technology | CMOS (low-power) |
| Trạng thái RoHS | unknown |
Cấu hình chân PIC16LC74AT-04I/PQ
| 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 / Voltage reference |
| Chân 6 | RA4/T0CKI — PORTA bit 4 / Timer 0 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 |
| Chân 12 | VSS — Ground reference |
| Chân 13 | OSC1/CLKIN — Oscillator input / External clock input |
| Chân 14 | OSC2/CLKOUT — Oscillator output / Clock output |
| Chân 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer 1 oscillator output / Timer 1 clock input |
| Chân 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer 1 oscillator input / CCP2 |
| Chân 17 | RC2/CCP1 — PORTC bit 2 / CCP1 (PWM/Capture/Compare) |
| Chân 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 19 | RD0 — PORTD bit 0 |
| Chân 20 | RD1 — PORTD bit 1 |
| Chân 21 | RD2 — PORTD bit 2 |
| Chân 22 | RD3 — PORTD 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 / UART transmit / USART clock |
| Chân 26 | RC7/RX/DT — PORTC bit 7 / UART receive / USART data |
| Chân 27 | RD4 — PORTD bit 4 |
| Chân 28 | RD5 — PORTD bit 5 |
| Chân 29 | RD6 — PORTD bit 6 |
| Chân 30 | RD7 — PORTD bit 7 |
| Chân 31 | VSS — Ground reference |
| Chân 32 | VDD — Positive supply voltage |
| 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 |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC16LC74AT-04I/PQ phù hợp cho 7 Áp dụngs: Industrial Automation Controllers, Consumer Electronics Appliances, HVAC Control Systems, Automotive Body Electronics, Low-Cost Sensor Interface Boards, Instrumentation and Data Loggers, Security and Access Control Panels.
Industrial Automation Controllers
The PIC16LC74AT-04I/PQ fits industrial automation controllers with its 5-channel 8-bit ADC for sensor conditioning (temperature, pressure, flow), 33 I/O pins for relay and actuator driving, and I2C/SPI/UART for inter-MCU and HMI communication. The 2.5V-6V supply simplifies 24V-bus-derived 5V rail integration. The -40C to +85C industrial temperature grade supports factory floor operation. Integrated Brown-out Reset protects firmware during industrial supply transients. Pin-compatible PIC16F74A replacement is recommended for new designs needing Flash reprogrammability.
Được đề xuất
Consumer Electronics Appliances
The PIC16LC74AT-04I/PQ serves consumer appliances such as washing machines, microwave ovens, and coffee makers where fixed-function control with no firmware update is acceptable. The 7KB OTP memory holds the control algorithm permanently, reducing field-support costs. The integrated ADC reads temperature and level sensors, the PWM outputs drive motor controllers, and the UART enables diagnostics during factory test. The 4 MHz instruction rate is sufficient for keypad debouncing, display multiplexing, and basic state-machine control loops typical in appliance electronics.
Được đề xuất
HVAC Control Systems
The PIC16LC74AT-04I/PQ fits HVAC control boards needing analog sensor reading and serial communications. The 8-bit ADC handles thermistor and pressure-sensor inputs across five channels, while the SPI bus drives a graphic LCD display and the I2C bus communicates with the indoor unit's thermistor network. The 192-byte RAM is sufficient for HVAC state machine and temperature-history buffers. Brown-out Reset ensures clean restart after compressor-induced voltage dips. The 44-MQFP package allows compact PCB layout fitting within thermostat enclosures.
Được đề xuất
Automotive Body Electronics
The PIC16LC74AT-04I/PQ operates in automotive body controllers for seat adjustment, mirror control, and lighting modules. The industrial temperature grade accommodates under-dash and door-module environments. Three serial interfaces enable Body Control Module (BCM) communication, while the 5-channel ADC reads switch positions and ambient light. The wide 2.5V-6V supply tolerates 12V battery transients after regulator decoupling. However, for AEC-Q100 qualified designs, the automotive-grade PIC16F74A-I/PQ is preferred over this industrial-rated variant.
Được đề xuất
Low-Cost Sensor Interface Boards
The PIC16LC74AT-04I/PQ is well-suited to sensor-interface PCBs that aggregate analog inputs and forward them over a serial bus. The 5-channel 8-bit ADC multiplexes thermistor, photodiode, and potentiometer signals; the UART outputs a Modbus or custom protocol frame to a host controller. The 33 I/O pins drive status LEDs and select lines. The 2.5V minimum supply allows battery-powered operation with a single lithium cell. OTP memory locks the calibration coefficients permanently, preventing end-user modification.
Được đề xuất
Instrumentation and Data Loggers
The PIC16LC74AT-04I/PQ fits portable data loggers recording temperature, humidity, and voltage over time. The integrated ADC samples environmental sensors, while the UART streams records to a host PC or stores them in an external EEPROM via I2C. The 192-byte RAM serves as a circular buffer between samples. Low-voltage operation down to 2.5V lets the design run from two AA cells. Brown-out Reset protects the log pointer during battery end-of-life. The OTP memory locks the logging algorithm, deterring firmware tampering in field-deployed units.
Được đề xuất
Security and Access Control Panels
The PIC16LC74AT-04I/PQ serves access-control keypad panels reading PIN codes and driving relay outputs for door strikes. The 33 I/O pins scan a 4x4 matrix keypad, drive status LEDs, and control the electric-latch relay. The I2C interface reads a real-time clock for time-stamping entry events, while the UART links to a central access controller. Brown-out Reset and Watchdog Timer prevent lockout in fault conditions. OTP memory locks the PIN-validation algorithm and prevents unauthorized firmware reverse-engineering, a security advantage over Flash parts.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LC74AT-04I/PQ — 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 | PIC16LC74A-04/PQ | PIC16LC74AT-04/PQ | PIC16LC65BT-04I/PQ | PIC16LC65B-04/PQ | PIC16LC65A-04I/PQ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-MQFP (10x10) | 44-MQFP (10x10) - same | 44-MQFP (10x10) - same | 44-MQFP (10x10) - same | 44-MQFP (10x10) - same | 44-MQFP (10x10) - same |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 4 KB OTP (-43%) | 4 KB OTP (-43%) | 4 KB OTP (-43%) |
| RAM Size | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Supply Voltage | 2.5 V to 6 V | 2.5 V to 6 V | 2.5 V to 6 V | 2.5 V to 6 V | 2.5 V to 6 V | 2.5 V to 6 V |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | 0 C to +70 C (Commercial) | -40 C to +85 C | 0 C to +70 C | -40 C to +85 C |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Bảo phân biệt quan trọng
- Highest OTP program memory in the 44-MQFP PIC16C7X family (vsPIC16LC65BT-04I/PQ)
- Industrial temperature grade included (vsPIC16LC74AT-04/PQ)
- Integrated 5-channel 8-bit ADC absent in PIC16C64/65 family (vsPIC16LC65A-04I/PQ)
Ghi chú thiết kế
Estimated: the PIC16LC74AT-04I/PQ typical active current at 4 MHz and 5 V is approximately 2-5 mA depending on peripheral activity, dropping to microampere levels in sleep mode. Place a 100 nF decoupling capacitor as close as possible to each VDD/VSS pair (pins 11/12, 31/32, 41/42), and add a bulk 10 uF tantalum or ceramic capacitor near the MCU power pin. The wide 2.5V-6V supply range simplifies integration with both 3.3V and 5V rails, but the BOR (Brown-out Reset) trip voltage must be configured per application note TB087.
Keep the 44-MQFP (10x10 mm) package on a clearly-routed section of the PCB with the 0.8 mm pitch gull-wing leads aligned with the land pattern. Use reflow profiles within the JEDEC J-STD-020 MSL-3 window for plastic MQFP packages; the device is moisture-sensitive and requires dry-pack handling and pre-bake if floor-life has expired. Place the 4 MHz crystal or resonator within 5 mm of OSC1/OSC2 pins 13 and 14, with a grounded guard ring around the oscillator traces to reduce EMI coupling into adjacent analog channels.
Critical pitfall: the OTP EPROM can be programmed only once - there is no in-circuit reprogramming path. Any firmware revision requires a new wafer programming, so production firmware must be fully validated on a windowed CERDIP prototype (e.g., PIC16C74A-04/P) before committing to the OTP package. Also note that I2C and SPI share the SSP module on PORTC pins RC3/RC4, so both interfaces cannot operate simultaneously on independent buses - this limits multi-bus designs. The Watchdog Timer must be enabled in configuration bits if used; otherwise it is disabled at reset.
Estimated: at 4 MHz system clock the instruction cycle is 1 microsecond, well below the bandwidth where signal integrity dominates the 44-MQFP layout. However, the analog inputs AN0-AN7 are multiplexed onto a single ADC and benefit from short traces to minimize crosstalk. Route the AVdd/VREF reference separately from digital VDD and place a ferrite bead or 10 ohm resistor between them; decouple VREF with 100 nF + 10 uF close to pin 5. For ADC accuracy better than +/-1 LSB, average multiple samples and use the acquisition-delay minimums from section 11 of the datasheet.
Thông tin tuân thủ
RoHS, REACH, lead-free and halogen-free status not present in the Verified Web Data for this obsolete part. Part is industrial temperature grade but not AEC-Q100 qualified - choose automotive-grade PIC16F74A-I/PQ for AEC-Q100 applications.
