PIC16LC74B-04/PQ - 8-bit 4MHz MCU, 7KB OTP, 44-MQFP | Microchip
MPN: PIC16LC74B-04/PQ ✗ انتهى عمره الإنتاجيPIC16LC74B-04/PQ نظرة عامة
A microcontroller is a programmable single-chip computer that integrates a CPU, memory, and peripherals; the PIC16CXX mid-range family extends this with EEPROM/OTP program memory and analog peripherals. As the third generation of Microchip's mid-range architecture, the PIC16LC74B sits in a hierarchy of PIC16C63A/65B/73B/74B devices, sharing a fully-static CMOS design that supports low-power and battery-backed operation, a critical advantage in industrial controls and instrumentation where the supply may be unstable.
Key features include 33 digital I/O pins, two 8-bit timers plus one 16-bit timer, a 10-bit multi-channel Analog-to-Digital Converter (ADC), two PWM modules, a Universal Synchronous/Asynchronous Receiver-Transmitter (USART) for serial communication, and a synchronous serial port (SSP) supporting SPI and I2C. The integrated In-Circuit Serial Programming (ICSP) interface enables field firmware updates without removing the part from the board, and the device supports in-circuit debugging. Power-saving features include multiple sleep modes (SLEEP), a watchdog timer with its own on-chip RC oscillator, and programmable brown-out reset.
The architecture combines a Harvard-design CPU with separate program and data buses, allowing instruction fetch and operand read to occur in the same cycle. This dual-bus structure is the source of the family's celebrated code density and deterministic interrupt latency. The 14-bit instruction word keeps loop bodies short, and the 8-level stack plus hardware context save on interrupt entry simplify real-time programming.
Typical applications include industrial control panels, HVAC thermostats, motor-control pre-drivers (with the PWM/CCP modules), sensor signal conditioning (using the ADC), and low-power data-acquisition instruments. The 44-MQFP footprint is well-suited to mid-density designs that need analog inputs and serial connectivity without resorting to larger 64-pin packages.
A critical design consideration is OTP volatility: because OTP memory is programmed once and cannot be erased, prototypes and low-volume production should use the windowed (JW) or flash-based PIC16F74 variant instead. Always specify the correct operating temperature grade for your environment.
This page synthesizes distributor pricing, drop-in same-brand alternatives, and design notes not found on a single manufacturer datasheet page.
بدائل مباشرة لـ PIC16LC74B-04/PQ — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع PIC16LC74B-04/PQ (نفس عامل الشكل والبصمة) — يختلف في Program Memory Size, Program Memory Type, RoHS Status, ADC, Core.
PIC16LC74B-04I/PQ
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC16LC74BT-04/PQ
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
PIC16LC74B-04E/PQ
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
PIC16LC65B-04/PQ
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC16LC65A-04/PQ
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC16LC74A-04/PQ
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC16LC74B-04/PQ الحدود القصوى والخصائص الكهربائية
| Core Architecture | PIC16CXX mid-range 8-bit RISC |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 7KB (4K x 14 instructions) |
| RAM Size | 192 bytes |
| EEPROM Data Memory | None (external for non-volatile storage) |
| أقصى تردد للساعة | 4 MHz |
| Instruction Cycle Time | 200 ns (5 MIPS peak) |
| Instruction Set Size | 35 single-word instructions |
| Supply Voltage Range (LC) | 2.5 V to 5.5 V |
| Digital I/O Pins | 33 |
| Analog-to-Digital Converter | 10-bit, multi-channel (per Microchip PIC16C74B product page) |
| Timers | Two 8-bit + one 16-bit Timer/Counter modules |
| PWM Modules | 2 (CCP/ECCP) |
| Serial Communication | USART + SSP (SPI / I2C) |
| درجة حرارة التشغيل | 0 C to +70 C |
| العلبة | 44-MQFP (10x10 mm), surface-mount tray |
| نوع التركيب | Surface Mount |
| حالة RoHS | Compliant (per distributor listings) |
تكوين أطراف PIC16LC74B-04/PQ
| دبوس 1 | MCLR/Vpp — Master Clear (active-low reset) / programming voltage input |
| دبوس 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| دبوس 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| دبوس 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| دبوس 5 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC reference positive |
| دبوس 6 | RA4/T0CKI — PORTA bit 4 (open-drain) / Timer0 clock input |
| دبوس 7 | RA5/AN4 — PORTA bit 5 / Analog input 4 |
| دبوس 8 | OSC2/CLKO — Oscillator output / Clock output (Fosc/4) |
| دبوس 9 | OSC1/CLKI — Oscillator input / External clock input |
| دبوس 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| دبوس 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 PWM output |
| دبوس 12 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| دبوس 13 | RC3/SCK/SCL — PORTC bit 3 / SSP SPI clock / I2C clock |
| دبوس 14 | RD0 — PORTD bit 0 (parallel slave port) |
| دبوس 15 | RD1 — PORTD bit 1 (parallel slave port) |
| دبوس 16 | RD2 — PORTD bit 2 (parallel slave port) |
| دبوس 17 | RD3 — PORTD bit 3 (parallel slave port) |
| دبوس 18 | RC4/SDI/SDA — PORTC bit 4 / SSP SPI data in / I2C data |
| دبوس 19 | RC5/SDO — PORTC bit 5 / SSP SPI data out |
| دبوس 20 | RC6/TX/CK — PORTC bit 6 / USART TX / USART sync clock |
| دبوس 21 | RC7/RX/DT — PORTC bit 7 / USART RX / USART sync data |
| دبوس 22 | RD4 — PORTD bit 4 (parallel slave port) |
| دبوس 23 | RD5 — PORTD bit 5 (parallel slave port) |
| دبوس 24 | RD6 — PORTD bit 6 (parallel slave port) |
| دبوس 25 | RD7 — PORTD bit 7 (parallel slave port) |
| دبوس 26 | RE0/RD — PORTE bit 0 / PSP read control |
| دبوس 27 | RE1/WR — PORTE bit 1 / PSP write control |
| دبوس 28 | RE2/CS — PORTE bit 2 / PSP chip select |
| دبوس 29 | VSS — Ground reference |
| دبوس 30 | VDD — Positive supply voltage (2.5V to 5.5V) |
| دبوس 31 | OSC2 (RB6 alt) — Oscillator / RB6 alternate; per datasheet note |
| دبوس 32 | OSC1 (RB7 alt) — Oscillator / RB7 alternate; per datasheet note |
| دبوس 33 | RB0/INT — PORTB bit 0 / External interrupt input |
| دبوس 34 | RB1 — PORTB bit 1 |
| دبوس 35 | RB2 — PORTB bit 2 |
| دبوس 36 | RB3/PGM — PORTB bit 3 / LVP programming enable |
| دبوس 37 | RB4 — PORTB bit 4 |
| دبوس 38 | RB5 — PORTB bit 5 |
| دبوس 39 | RB6/PGC — PORTB bit 6 / ICSP clock (programming/debugging) |
| دبوس 40 | RB7/PGD — PORTB bit 7 / ICSP data (programming/debugging) |
| دبوس 41 | AVDD — Analog supply voltage (tie to VDD for best ADC performance) |
| دبوس 42 | AVSS — Analog ground reference |
| دبوس 43 | VREF- — ADC reference negative (tie to AVSS in single-ended mode) |
| دبوس 44 | VREF+/AN5 — ADC reference positive / Analog input 5 (per datasheet note) |
التطبيقات النموذجية
PIC16LC74B-04/PQ مناسب لـ 6 التطبيقs: Industrial Control Panels, HVAC Thermostats, Sensor Signal Conditioning Nodes, Low-Power Data Acquisition, Motor Control Pre-Driver, Consumer Appliance Control.
Industrial Control Panels
The PIC16LC74B-04/PQ's 33 GPIO, 10-bit ADC and dual PWM modules make it a strong fit for industrial control panels that read sensor inputs and drive relays or H-bridges. Its 2.5V to 5.5V range lets one firmware image run from 3.3V or 5V backplanes; 5 MIPS throughput is more than enough for I/O scanning at 10 ms rates. Place the part in the panel backplane with the watchdog timer enabled to recover from brown-out events.
موصى به
HVAC Thermostats
The PIC16LC74B-04/PQ's low-voltage LC variant (2.5V to 5.5V) and modest 7KB OTP fit HVAC thermostat designs where the MCU reads thermistor inputs and switches triacs. The part's 33 I/O accommodate the LCD segment driver plus 24VAC zero-cross detection and triac gate control. The integrated 10-bit ADC eliminates an external converter, and the 200ns interrupt latency keeps the control loop well below the half-cycle 8.3ms mains period.
موصى به
Sensor Signal Conditioning Nodes
The PIC16LC74B-04/PQ's 10-bit ADC plus USART suits distributed sensor nodes that digitize analog input and stream data via RS-485. The fully-static CMOS core lets the firmware sleep between samples, dropping current to microamp range and stretching battery life. With 192 bytes of RAM the device handles short FIFO buffering before each transmit, and the SSP supports SPI to a local ADC front-end if higher resolution is needed.
موصى به
Low-Power Data Acquisition
The PIC16LC74B-04/PQ's low-voltage supply window and static CMOS design make it well-matched to battery-backed data loggers that sample infrequently and sleep between acquisitions. The integrated 10-bit ADC provides adequate resolution for thermocouple-grade temperature sensing through external amplification, while the 192 bytes of RAM buffer multiple samples before asynchronous serial transmission. Brown-out reset keeps the firmware deterministic during battery droop events.
موصى به
Motor Control Pre-Driver
The PIC16LC74B-04/PQ's two PWM (CCP) channels plus 10-bit ADC are enough for a brushed-DC motor pre-driver that samples current and adjusts duty cycle without an external DSP. The 4MHz instruction rate gives 200ns loop time, well under the 100us typical PWM period at 10kHz switching. Program-memory space accommodates closed-loop control tables without needing an external supervisor.
موصى به
Consumer Appliance Control
The PIC16LC74B-04/PQ's 33 I/O fit mid-density consumer appliances such as coffee machines, washing-machine front panels, and microwave ovens that demand a 5V-tolerant MCU with PWM, ADC and USART in one package. The OTP program memory keeps per-unit production cost down for high-volume SKUs, while the SSP enables driver IC communication via SPI. Use the integrated watchdog timer for field-reliable recovery from power-line glitches.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ PIC16LC74B-04/PQ — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | PIC16LC74B-04I/PQ | PIC16LC74BT-04/PQ | PIC16LC74B-04E/PQ | PIC16LC74A-04/PQ | PIC16LC65B-04/PQ | PIC16LC65A-04/PQ |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) |
| Operating Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
| Maximum Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Program Memory Type | OTP (7KB / 4K x 14) | OTP (7KB / 4K x 14) | OTP (7KB / 4K x 14) | OTP (7KB / 4K x 14) | OTP (7KB / 4K x 14) | OTP (8KB) | OTP (8KB) |
| Operating Temperature | 0 C to +70 C | -40 C to +85 C | 0 C to +70 C (tape-and-reel packaging code) | -40 C to +125 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C |
| RAM Size | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND | NRND |
أبرز الفروقات
- Low-voltage LC variant for 3.3V and 5V dual-rail flexibility (مقابلPIC16C74B-04/PQ)
- Industrial temperature grade option in same package (مقابلPIC16LC74B-04/PQ (commercial 0C to +70C))
- 8KB upgrade path within the same 44-MQFP footprint (مقابلPIC16LC65B-04/PQ)
ملاحظات التصميم
PIC16LC74B-04/PQ's 2.5V to 5.5V single-supply operation lets one board design serve 3.3V and 5V rails, but bulk decoupling must use a 10uF tantalum plus 0.1uF ceramic near each VDD/AVDD pin pair. According to Microchip datasheet 30211D, AVDD and AVSS must be tied to VDD and VSS respectively or the ADC reference saturates; an LC filter on AVDD with -10 dB attenuation at switching frequency is standard practice in motor-control and SSR-noise environments.
PIC16LC74B-04/PQ is OTP-based, so once programmed the firmware is permanent. For prototyping and any low-volume production that may need firmware revisions, use the flash-based PIC16F74-04/PQ (same pinout, same 44-MQFP footprint) instead. The OTP part is the right choice only when firmware is locked and per-unit cost is paramount; allocating time to set up Microchip's MPLAB + PicKit compatible programmer is the main engineering overhead unique to OTP deployment.
Place the 4MHz crystal or resonator within 5mm of the OSC1/OSC2 pins and keep the traces short over a continuous ground pour. RB6/PGC and RB7/PGD are the ICSP pins and must not be used as outputs only; route them to a 5-pin in-system programming header. According to Microchip ICSP specification, avoid long parallel runs on PGC/PGD adjacent to high-current traces, as capacitance above 30pF forces the programmer to drop to slower programming modes.
When the PIC16LC74B-04/PQ drives long cables (RS-485, parallel PSP bus, or external LCD backplanes), add 22-100 ohm series resistors on PORTC outputs to dampen transmission-line overshoot. The PORTD parallel slave port (PSP) outputs and PORTC USART lines are particularly vulnerable to reflection on cables over 100mm. Internal weak pull-ups on PORTB (typical 50kohm) suffice for pushbutton input paths but should not be relied on for wired-OR applications.
معلومات الامتثال
RoHS compliance per distributor (LCSC, Jotrin) listings. REACH and halogen-free status not explicitly published in retrieved web data - flagged unknown. AEC-Q100 not applicable for general-purpose industrial/consumer MCUs.
