PIC16LC74B-04/L - 8-Bit OTP MCU, 4MHz, 7KB | Microchip | Embedded
MPN: PIC16LC74B-04/L ⚠ Lần mua cuốiPIC16LC74B-04/L Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + data), peripherals, and I/O onto one die. The PIC16LC74B belongs to the mid-range PIC architecture, sitting in the hierarchy: PIC16LC74B -> PIC16CXX family -> 8-bit PIC microcontroller -> MCU -> embedded processor -> integrated circuit. Mid-range PICs use a 14-bit instruction word and a Harvard architecture with separate program/data paths, offering deterministic instruction timing useful for real-time control.
Key features include 33 I/O pins with high-current sink/source, multiple peripherals (USART, SSP/SPI/I2C, 8-channel 8-bit ADC, capture/compare/PWM, timers), and a 15-bit program counter that addresses 32KB of program space. The 'LC' prefix indicates a low-power CMOS variant supporting 2.0V to 6.0V VDD, while the standard PIC16C74B (no L) supports 4.2V to 6.0V. The OTP memory is programmed once and is non-erasable, making this part suited for production volumes where field firmware updates are not required.
This PIC16LC74B-04/L is intended for embedded control applications requiring deterministic 8-bit performance in a surface-mount PLCC footprint. Common uses include industrial controllers, motor control front-ends, sensor interface boards, consumer appliances, and legacy equipment retrofits. Because it uses a 44-pin PLCC package with through-hole-style J-leads, it is also socketable, simplifying prototyping and field replacement. Engineers migrating from the PIC16C74B benefit from pin and code compatibility per Microchip's PICmicro Pin and Code Compatibility Chart.
Design considerations: ensure VDD is within the LC-variant range (2.0V-6.0V); use the MCLR reset pin with a proper pull-up and, if needed, an external brown-out supervisor; configure the oscillator mode (RC/HS/XT/LP) per the application. OTP programming requires a Microchip programmer (PICSTART Plus, ICD, etc.) at production time - plan device provisioning accordingly.
This page synthesizes distributor pricing, lifecycle signals, drop-in PIC16-family alternatives, and practical design notes for the PIC16LC74B-04/L not found in a single datasheet view.
Bộ thay thế dễ dàng lắp đặt cho PIC16LC74B-04/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 PIC16LC74B-04/L (cùng hình factor và footprint) — khác nhau ở Mounting Type, Package, Program Memory Size, Program Memory Type, Timers.
PIC16C74B-04/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC74BT-04/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC74A-04/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74A-04I/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16LC64A-04I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC74B-04/L Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit PIC mid-range (PIC16CXX family, 14-bit instruction word) |
| Tần số xung maksimum | 4 MHz |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14) |
| RAM Size | 192 bytes |
| Data EEPROM | Not specified in distributor listing |
| Supply Voltage (VDD) | 2.0 V to 6.0 V (LC low-voltage variant) |
| I/O Pins | 33 |
| ADC | 8-channel, 8-bit |
| Timers | 3 (Timer0, Timer1, Timer2) |
| Capture/Compare/PWM | Yes (2 CCP modules) |
| Serial Interfaces | USART, SSP (SPI / I2C) |
| Hộp | 44-pin PLCC (16.59 x 16.59 mm, J-lead) |
| Kiểu lắp đặt | Surface Mount (PLCC socket-compatible) |
| Nhiệt độ hoạt động | 0C to +70C (commercial grade) |
Cấu hình chân PIC16LC74B-04/L
| Chân 1 | MCLR — Master Clear (reset) input, active low |
| 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 reference |
| 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 port read / Analog input 5 |
| Chân 9 | RE1/WR/AN6 — PORTE bit 1 / Parallel port write / Analog input 6 |
| Chân 10 | RE2/CS/AN8 — PORTE bit 2 / Parallel port chip select / Analog input 8 |
| Chân 11 | VDD — Positive supply (2.0V-6.0V) |
| Chân 12 | VSS — Ground reference |
| Chân 13 | OSC1/CLKIN — Oscillator crystal input / external clock in |
| Chân 14 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| 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 |
| Chân 17 | RC2/CCP1 — PORTC bit 2 / CCP1 |
| 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 (2.0V-6.0V) |
| 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 | RF0/AN5 — PORTF bit 0 / Analog input 5 |
| Chân 42 | RF1/AN6 — PORTF bit 1 / Analog input 6 |
| Chân 43 | RF2/AN7 — PORTF bit 2 / Analog input 7 |
| Chân 44 | RF3 — PORTF bit 3 |
Ứng dụng tiêu biểu
PIC16LC74B-04/L phù hợp cho 6 Áp dụngs: Industrial Motor Control Front-End, Sensor Interface / Data Acquisition Board, Consumer Appliance Controller, Legacy Equipment Retrofit / Replacement Boards, USART-Based Communication Modules, Battery-Powered Embedded Sensor Node.
Industrial Motor Control Front-End
The PIC16LC74B-04/L fits industrial motor control front-ends thanks to its 8-channel 8-bit ADC (for current/voltage sensing) and two CCP modules (PWM outputs for H-bridge control). Operating at 4 MHz, it can close a 10 kHz control loop while sampling all 8 ADC channels via multiplexed conversion. Its 33 I/O drives encoder inputs, end-stop switches, and relay outputs without external glue logic. The 2.0-6.0V LC supply range supports 3.3V logic rails common in BLDC inverter boards.
Được đề xuất
Sensor Interface / Data Acquisition Board
The PIC16LC74B-04/L serves well in sensor interface boards because its 8-channel 8-bit ADC supports parallel analog sensor arrays (e.g. thermocouples, RTDs, pressure transducers). The 192-byte RAM is sufficient for averaging/decimation buffers, while the USART and SSP peripherals enable SPI or I2C sensor busses. The 4 MHz clock samples at ~30 kS/s aggregate, ideal for slow environmental monitoring. The 44-PLCC socketable package simplifies field calibration and replacement.
Được đề xuất
Consumer Appliance Controller
Consumer appliances such as washing machines, microwave ovens, and dishwasher controllers benefit from the PIC16LC74B-04/L's deterministic 8-bit performance and rich peripheral set. The 33 I/O drives seven-segment displays, buzzer PWM, keypad matrix, and triac-triggered heater relays. The 7 KB OTP holds the full appliance state machine and user-interface logic. The 2.0-6.0V LC range simplifies direct connection to rectified mains-derived 5V or 3V rails.
Được đề xuất
Legacy Equipment Retrofit / Replacement Boards
The PIC16LC74B-04/L is ideal for legacy equipment retrofits where exact compatibility with the 44-PLCC /L footprint is required. Its pin and code compatibility with the broader PIC16CXX mid-range family (per Microchip Pin and Code Compatibility Chart) allows firmware reuse from PIC16C74A/B or PIC16LC64A designs. The PLCC package is socketable, simplifying field service - technicians can swap chips without desoldering.
Được đề xuất
USART-Based Communication Modules
For USART-based communication modules (RS-232/485 bridges, sensor concentrators), the PIC16LC74B-04/L provides a hardware USART with auto-baud detection and a 9-bit address mode for RS-485 multi-drop networks. The 33 I/O supports DE/RE flow-control signals and protocol-select jumpers. Combined with the SSP module, the device can act as an SPI-to-UART gateway, offloading bus conversion in industrial networking modules.
Được đề xuất
Battery-Powered Embedded Sensor Node
Battery-powered sensor nodes leverage the PIC16LC74B-04/L's 2.0V VDD minimum, allowing operation from two alkaline cells down to 2.0V end-of-life. The CMOS LC process keeps quiescent current low, while the 4 MHz clock and 7 KB OTP support wake-up via interrupt, sample, transmit via USART, and return to sleep. The 192-byte RAM and 33 I/O are sufficient for a star-topology wireless sensor hub running simple MAC-layer firmware.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LC74B-04/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 | PIC16C74B-04/L | PIC16LC74BT-04/L | PIC16LC74A-04/L | PIC16C74A-04I/L | PIC16LC64A-04I/L |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | 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 | 44-PLCC - same |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 3.5 KB OTP (-50%) |
| RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 128 bytes (-33%) |
| Maximum Clock | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Supply Voltage | 2.0 V to 6.0 V | 4.2 V to 6.0 V | 2.0 V to 6.0 V | 2.0 V to 6.0 V | 4.2 V to 6.0 V | 2.0 V to 6.0 V |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| ADC | 8-ch / 8-bit | 8-ch / 8-bit | 8-ch / 8-bit | 8-ch / 8-bit | 8-ch / 8-bit | 8-ch / 8-bit |
| Memory Type | OTP | OTP | OTP | OTP | OTP | OTP |
| Operating Temperature | 0C to +70C | 0C to +70C | 0C to +70C | 0C to +70C | -40C to +85C (industrial) | -40C to +85C (industrial) |
Bảo phân biệt quan trọng
- Wide 2.0V-6.0V supply range for low-voltage and 5V systems (vsPIC16C74B-04/L)
- 33 I/O with 8-channel 8-bit ADC and dual CCP in 44-PLCC (vsPIC16LC64A-04I/L)
- Mid-range PIC code-compatibility per Microchip compatibility chart (vsPIC16LC74A-04/L)
Ghi chú thiết kế
Estimated: at 4 MHz and 5V VDD, the PIC16LC74B-04/L core draws approximately 2-4 mA active and <1 uA in sleep, based on mid-range LC process typicals. Add bulk decoupling (10uF + 100nF) close to VDD pins (pin 11 and pin 32), and place a 100nF between VDD pairs of common-mode noise. For 3.3V rails, the LC process tolerates down to 2.0V but performance degrades at lower VDD; verify ADC accuracy and oscillator start-up margin at the minimum supply voltage.
The 44-PLCC package has J-leads on four sides with 1.27 mm pitch. Place a PLCC-44 socket (machined-pin or surface-mount) for field serviceability. Route OSC1/OSC2 (pin 13/14) traces as short as possible with grounded guard traces for crystal oscillator configurations; for RC oscillator mode, keep R/C components close to OSC1. Keep the MCLR trace short with the pull-up resistor within 10 mm of pin 1 to minimize spurious resets.
The PIC16LC74B-04/L is OTP (one-time programmable) - the program memory cannot be erased or rewritten. Engineering builds should use a flash-based sibling (PIC16F74A-I/L, same PLCC-44 footprint) for development, then convert to PIC16LC74B-04/L only for production runs where firmware is locked. Do not confuse the /L (PLCC) package designator with /P (PDIP) or /PT (TQFP) - the pinouts are NOT interchangeable: PLCC-44, PDIP-40, and TQFP-44 all have different pin maps.
Estimated: separate analog and digital ground planes are recommended when using the ADC - PORTA/RE pins serve dual analog/digital roles. Place the AVdd (pin 11 if tied to VDD) decoupling within 5 mm of the pin. Use the AN3/VREF pin (pin 5) only when a precise external reference is needed; for VDD-based reference, leave it unconnected and configure ADC accordingly. PORTF analog inputs (RF0-RF2) on PLCC-44 are routed separately from PORTA - verify channel mapping against your schematic.
Thông tin tuân thủ
RoHS, REACH, lead-free and halogen-free status not stated in distributor listings; refer to Microchip product environmental compliance page for the latest certificate. AEC-Q100 not applicable - this is a commercial/industrial MCU, not automotive qualified.
