PIC16LC74AT-04I/PQ - 8-Bit 4MHz MCU, 7KB OTP, 44-MQFP | Microchip
MPN: PIC16LC74AT-04I/PQ ✗ اختتامِ زندگیPIC16LC74AT-04I/PQ جائزہ
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.
کے لیے ڈراپ اِن متبادل PIC16LC74AT-04I/PQ — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں PIC16LC74AT-04I/PQ (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Package, ADC, Communication Interfaces, Program Memory Type, Operating Temperature Range.
PIC16LC74A-04/PQ
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16LC74AT-04/PQ
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
PIC16LC65BT-04I/PQ
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16LC65B-04/PQ
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16LC65AT-04I/PT
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16LC65A-04I/PQ
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16LC64AT-04I/L
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16LC74AT-04I/PQ زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| Core Architecture | PIC16C (8-bit Harvard RISC) |
| Instruction Set Width | 14-bit |
| زیادہ سے زیادہ کلاک فریکوئنسی | 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 |
| آپریٹنگ درجہ حرارت رینج | -40 C to +85 C (Industrial) |
| پیکیج | 44-pin MQFP (10x10 mm) |
| ماؤنٹنگ ٹائپ | Surface Mount |
| Process Technology | CMOS (low-power) |
| RoHS اسٹیٹس | unknown |
PIC16LC74AT-04I/PQ پن کنفیگریشن
| پن 1 | MCLR/VPP — Master Clear (Reset) input / Programming voltage |
| پن 2 | RA0/AN0 — PORTA bit 0 / Analog input channel 0 |
| پن 3 | RA1/AN1 — PORTA bit 1 / Analog input channel 1 |
| پن 4 | RA2/AN2 — PORTA bit 2 / Analog input channel 2 |
| پن 5 | RA3/AN3/VREF — PORTA bit 3 / Analog input channel 3 / Voltage reference |
| پن 6 | RA4/T0CKI — PORTA bit 4 / Timer 0 clock input |
| پن 7 | RA5/AN4/SS — PORTA bit 5 / Analog input channel 4 / SPI Slave Select |
| پن 8 | RE0/RD/AN5 — PORTE bit 0 / Read control / Analog input channel 5 |
| پن 9 | RE1/WR/AN6 — PORTE bit 1 / Write control / Analog input channel 6 |
| پن 10 | RE2/CS/AN7 — PORTE bit 2 / Chip Select / Analog input channel 7 |
| پن 11 | VDD — Positive supply voltage |
| پن 12 | VSS — Ground reference |
| پن 13 | OSC1/CLKIN — Oscillator input / External clock input |
| پن 14 | OSC2/CLKOUT — Oscillator output / Clock output |
| پن 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer 1 oscillator output / Timer 1 clock input |
| پن 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer 1 oscillator input / CCP2 |
| پن 17 | RC2/CCP1 — PORTC bit 2 / CCP1 (PWM/Capture/Compare) |
| پن 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| پن 19 | RD0 — PORTD bit 0 |
| پن 20 | RD1 — PORTD bit 1 |
| پن 21 | RD2 — PORTD bit 2 |
| پن 22 | RD3 — PORTD bit 3 |
| پن 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| پن 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| پن 25 | RC6/TX/CK — PORTC bit 6 / UART transmit / USART clock |
| پن 26 | RC7/RX/DT — PORTC bit 7 / UART receive / USART data |
| پن 27 | RD4 — PORTD bit 4 |
| پن 28 | RD5 — PORTD bit 5 |
| پن 29 | RD6 — PORTD bit 6 |
| پن 30 | RD7 — PORTD bit 7 |
| پن 31 | VSS — Ground reference |
| پن 32 | VDD — Positive supply voltage |
| پن 33 | RB0/INT — PORTB bit 0 / External interrupt |
| پن 34 | RB1 — PORTB bit 1 |
| پن 35 | RB2 — PORTB bit 2 |
| پن 36 | RB3 — PORTB bit 3 |
| پن 37 | RB4 — PORTB bit 4 |
| پن 38 | RB5 — PORTB bit 5 |
| پن 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| پن 40 | RB7/PGD — PORTB bit 7 / ICSP data |
| پن 41 | VSS — Ground reference |
| پن 42 | VDD — Positive supply voltage |
| پن 43 | NC — Not connected (per datasheet) |
| پن 44 | NC — Not connected (per datasheet) |
عام استعمالات
PIC16LC74AT-04I/PQ کے لیے موزوں ہے 7 ایپلیکیشنs: 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.
تجویز کردہ
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.
تجویز کردہ
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.
تجویز کردہ
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.
تجویز کردہ
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.
تجویز کردہ
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.
تجویز کردہ
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.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا PIC16LC74AT-04I/PQ — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | 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 |
اہم امتیازی خصوصیات
- Highest OTP program memory in the 44-MQFP PIC16C7X family (بمقابلہPIC16LC65BT-04I/PQ)
- Industrial temperature grade included (بمقابلہPIC16LC74AT-04/PQ)
- Integrated 5-channel 8-bit ADC absent in PIC16C64/65 family (بمقابلہPIC16LC65A-04I/PQ)
ڈیزائن نوٹس
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.
تعمیل کی معلومات
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.
