PIC16LC71T-04/SO - 8-Bit 4MHz MCU 1.75KB OTP 18-SOIC | Microchip
MPN: PIC16LC71T-04/SO ✗ Cuối đờiPIC16LC71T-04/SO Tóm tắt
A microcontroller is a single-chip computer that integrates a CPU, memory, and programmable I/O peripherals onto one die. Within the broader taxonomy, the PIC16C71X family sits as an 8-bit RISC MCU -> mid-range PIC16C -> 16-bit/8-bit microcontroller category -> embedded computing -> semiconductor. The "LC" prefix designates the low-power CMOS process variant suitable for battery-powered designs, while the "C" in PIC16C denotes the OTP ROM program memory technology (versus PIC16F which uses Flash).
Key features of the PIC16LC71T-04/SO include its 4MHz maximum clock rate (4MHz industrial-grade speed grade), integrated 8-bit ADC with 4 input channels (eliminates external ADC cost and PCB area), 13 bidirectional I/O pins (sufficient for most simple control tasks), 36-byte RAM file register space, and the PIC mid-range instruction set providing 35 single-word/single-cycle instructions for compact, deterministic code execution. The 18-SOIC package provides industry-standard 1.27mm pin pitch and is suitable for both hand-soldered prototypes and automated SMT assembly lines.
The PIC16LC71 architecture employs a Harvard-style separate program and data bus, allowing instruction fetch and operand access in a single instruction cycle. The on-chip peripherals include a Watchdog Timer (WDT) for code-flow monitoring, Power-on Reset (POR) for deterministic startup, and Timer0/Timer1 for event counting and timing. The "T" suffix in PIC16LC71T indicates Tape-and-Reel packaging orientation.
Typical applications include low-cost sensor-interface modules, battery-powered instrumentation, simple motor/valve controllers, HVAC thermostat controls, and consumer appliance user-interface boards. The integrated ADC simplifies analog front-end designs by removing the need for a dedicated external ADC chip.
Design consideration: because OTP memory is one-time programmable, firmware revisions require physical chip replacement - choose PIC16F-series Flash equivalents for development and field-updatable products. The commercial temperature grade (0C to +70C) makes this part unsuitable for industrial or automotive environments; choose "I" (industrial -40C to +85C) or "E" (extended -40C to +125C) variants for harsher thermal profiles.
This page synthesizes distributor availability, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho PIC16LC71T-04/SO — 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 PIC16LC71T-04/SO (cùng hình factor và footprint) — khác nhau ở Package, Timers, Core Architecture, Data EEPROM, Watchdog Timer.
PIC16LC71-04/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC71T-04I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC711T-04E/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC711-04I/SO
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16LC711-04/SO
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16LC71T-04/SO Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC16C mid-range 8-bit RISC |
| Program Memory Type | OTP (One-Time-Programmable) ROM |
| Program Memory Size | 1.75 KB (1K x 14 words) |
| Data RAM | 36 bytes |
| Tần số xung maksimum | 4 MHz |
| Instruction Set Width | 14-bit |
| Number of I/O Pins | 13 |
| ADC Resolution | 8-bit |
| ADC Channels | 4 |
| Package Type | 18-SOIC (SOIC-18) |
| Kiểu lắp đặt | Surface Mount |
| Terminal Form | GULL WING |
| Package Code | SOP |
| Temperature Grade | Commercial |
| Packaging Media | Tape and Reel (T-suffix) |
| Watchdog Timer | Yes (on-chip) |
| Power-on Reset | Yes (on-chip) |
Cấu hình chân PIC16LC71T-04/SO
| Chân 1 | MCLR — Master Clear Reset input (active low) |
| Chân 2 | RA0/AN0 — Port A bit 0 / ADC channel 0 input |
| Chân 3 | RA1/AN1 — Port A bit 1 / ADC channel 1 input |
| Chân 4 | RA2/AN2 — Port A bit 2 / ADC channel 2 input |
| Chân 5 | RA3/AN3/VREF — Port A bit 3 / ADC channel 3 / ADC voltage reference |
| Chân 6 | RA4/T0CKI — Port A bit 4 (open-drain) / Timer0 clock input |
| Chân 7 | VSS — Ground reference (0V) |
| Chân 8 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Chân 9 | OSC2/CLKOUT — Oscillator crystal output / clock output (Fosc/4) |
| Chân 10 | RB0/INT — Port B bit 0 / external interrupt input |
| Chân 11 | RB1 — Port B bit 1 (digital I/O) |
| Chân 12 | RB2 — Port B bit 2 (digital I/O) |
| Chân 13 | RB3 — Port B bit 3 (digital I/O) |
| Chân 14 | RB4 — Port B bit 4 (digital I/O, interrupt-on-change) |
| Chân 15 | RB5 — Port B bit 5 (digital I/O, interrupt-on-change) |
| Chân 16 | RB6 — Port B bit 6 (digital I/O, interrupt-on-change, ICSP clock) |
| Chân 17 | RB7 — Port B bit 7 (digital I/O, interrupt-on-change, ICSP data) |
| Chân 18 | VDD — Positive supply voltage (+5V typical) |
Ứng dụng tiêu biểu
PIC16LC71T-04/SO phù hợp cho 6 Áp dụngs: Battery-Powered Sensor Interface Module, HVAC Thermostat Control Board, Consumer Appliance User Interface, Simple Motor and Valve Controller, Electronic Lock and Access Control Module, Industrial Sensor-Interface Daughter Board.
Battery-Powered Sensor Interface Module
The PIC16LC71T-04/SO is well-suited for battery-powered sensor-interface modules where its on-chip 4-channel 8-bit ADC eliminates the need for an external ADC, reducing BOM cost and PCB area. The 'LC' low-power CMOS process draws only ~2 mA active at 4MHz / 5V and falls into the microamp range during Sleep mode, extending battery life in remote or portable sensor nodes. The integrated 8-bit ADC multiplexes 4 analog inputs (AN0-AN3) shared with Port A digital I/O, allowing direct connection of thermistors, photodiodes, or potentiometers without external signal conditioning. With 13 programmable I/O pins, the MCU can drive status LEDs, read user input buttons, and communicate via simple bit-banged protocols. The 1.75KB OTP program memory accommodates ~1K instruction words of well-structured C or assembly code, sufficient for typical sensor-processing algorithms including linearization and threshold-based decision logic.
Được đề xuất
HVAC Thermostat Control Board
The PIC16LC71T-04/SO serves as the central controller in residential and light-commercial HVAC thermostat control boards, where its 4-channel 8-bit ADC digitizes temperature sensor inputs (typically 10K NTC thermistor voltage dividers) and its 13 I/O pins drive the LCD/LED display, relay outputs for heating/cooling stages, and keypad input. The 4MHz clock provides adequate computational throughput for PID-style temperature control loops with sub-second update rates. The 1.75KB OTP program memory holds the complete thermostat firmware including scheduling, hysteresis algorithms, and user-interface menus without requiring external memory expansion. The 36-byte RAM accommodates the working variables for setpoint tracking, current temperature, and control state machine. The commercial 0C to +70C temperature range comfortably covers indoor HVAC control box environments. Compared to discrete logic implementations, this single-chip solution reduces component count by 50-70% and enables feature upgrades via firmware-only changes during initial production.
Được đề xuất
Consumer Appliance User Interface
In consumer appliances such as washing machines, microwave ovens, and small kitchen devices, the PIC16LC71T-04/SO provides the user-interface controller managing button-matrix scanning, 7-segment or LCD display driving, and basic appliance-state logic. The 13 I/O pins are partitioned across Port A (5 pins) for keypad rows and Port B (8 pins) for display segments and LED indicators, leaving pins free for buzzer control and door-sensor input. The mid-range PIC instruction set's compact 14-bit word width and 35 single-cycle instructions yield excellent code density, fitting complete appliance-control state machines into the 1.75KB OTP memory budget. The on-chip Watchdog Timer provides automatic recovery from firmware lockup conditions - critical for unattended appliances where customer-perceived reliability drives brand reputation. Power-on Reset ensures deterministic startup behavior after power interruptions, a mandatory feature for appliances with mechanical actuators that must default to safe states.
Được đề xuất
Simple Motor and Valve Controller
The PIC16LC71T-04/SO is deployed in simple motor-control and solenoid-valve-driver boards for low-power applications such as irrigation systems, automatic pet feeders, and small DC pump controllers. The integrated 8-bit ADC monitors current-sense amplifier outputs to detect motor stall conditions and trigger protective shutdown sequences, while Port B's 8 I/O pins drive logic-level MOSFET gate drivers for H-bridge or half-bridge topologies. The PIC16C71X's 1us instruction cycle at 4MHz provides responsive PWM generation via Timer0 overflow interrupts, suitable for low-frequency motor speed control (below 1 kHz PWM). The 36-byte RAM stores the controller's run-state variables including target RPM, current draw, and fault flags. The Harvard architecture's deterministic instruction timing makes this MCU family well-suited for hard-real-time control loops where predictable response latency matters more than raw computational throughput. The on-chip Watchdog Timer protects against firmware-induced runaway conditions in unattended installations.
Được đề xuất
Electronic Lock and Access Control Module
In electronic locks, cabinet access controllers, and simple keypad-entry systems, the PIC16LC71T-04/SO provides password verification, relay control for electric strikes or magnetic locks, and LED status indication. The 13 programmable I/O pins support a 3x4 matrix keypad (7 pins) plus 4-7 segment display lines plus solenoid relay drive, all within a single chip. OTP memory holds the comparison password and access logic, providing inherent security against external memory-probing attacks since the program contents cannot be electronically read after programming. The 4-channel 8-bit ADC can monitor battery voltage (for low-battery warning) and door-position sensors. The 4MHz clock provides fast response to keypad entries (sub-50ms debounce times) without taxing the computational budget. The compact 18-SOIC package fits easily into small-form-factor lock housings and integrates with both 5V regulated supplies and battery-backed 6V configurations with appropriate voltage regulation.
Được đề xuất
Industrial Sensor-Interface Daughter Board
The PIC16LC71T-04/SO functions as a low-cost industrial sensor-interface daughter board, converting analog transducer signals (4-20 mA current loop, 0-10V pressure, RTD temperature) into digital format for transmission to a host PLC or industrial bus. The 4-channel 8-bit ADC digitizes 4 sensor channels simultaneously with sufficient resolution for non-critical monitoring applications. The 13 I/O pins drive 4-20 mA current-loop transmitters, opto-isolated RS-485 transceivers, and discrete status LEDs. Although the commercial temperature grade (0C to +70C) limits deployment to controlled-environment panels, the pin-compatible PIC16LC71T-04I/SO variant extends operation to -40C to +85C for factory-floor installations. The Harvard architecture and 4MHz clock provide deterministic sampling intervals for time-correlated multi-sensor measurements. The 1.75KB OTP program memory holds the linearization lookup tables and protocol-handling firmware required for industrial transducer interfaces, while the 36-byte RAM buffers incoming sensor data between transmission cycles.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LC71T-04/SO — 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 | PIC16LC71-04/SO | PIC16LC71T-04I/SO | PIC16LC711T-04E/SO | PIC16LC711-04I/SO | PIC16LC711-04/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same |
| Program Memory | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP |
| RAM | 36 bytes | 36 bytes | 36 bytes | 36 bytes | 36 bytes | 36 bytes |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| ADC Channels x Resolution | 4 x 8-bit | 4 x 8-bit | 4 x 8-bit | 4 x 8-bit | 4 x 8-bit | 4 x 8-bit |
| I/O Pins | 13 | 13 | 13 | 13 | 13 | 13 |
| Temperature Grade | Commercial (0C to +70C) | Commercial | Industrial (-40C to +85C) | Extended (-40C to +125C) | Industrial (-40C to +85C) | Commercial |
| Packaging Media | Tape and Reel | Tube | Tape and Reel | Tape and Reel | Tube | Tube |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Bảo phân biệt quan trọng
- Tube-packaged identical-die alternative (vsPIC16LC71-04/SO)
- Industrial temperature variant available (vsPIC16LC71T-04I/SO)
- Pin-compatible upgraded PIC16LC711 family (vsPIC16LC711T-04E/SO)
Ghi chú thiết kế
OTP (One-Time-Programmable) memory cannot be erased or rewritten. Once a PIC16LC71T-04/SO is programmed, firmware bugs require physical chip replacement, not reprogramming. For development cycles and field-updatable products, choose a Flash-based PIC16F-series equivalent (such as PIC16F88A-I/SO in the same 18-SOIC package). The OTP memory also means there is no read protection on the program contents - all code is visible to anyone who decapsulates the die, so do not store secrets in firmware.
The 'LC' low-power CMOS process requires careful decoupling: place a 100nF ceramic bypass capacitor as close as physically possible to the VDD pin (Pin 18), with the ground lead returning directly to VSS (Pin 7). For noise-sensitive analog measurements via the on-chip ADC, add a 10uF bulk capacitor at the board's power input. The MCLR reset pin (Pin 1) should be pulled up to VDD through a 10K resistor with a 100nF capacitor to ground for proper power-on-reset behavior; do not leave MCLR floating.
When using the ADC, route analog input traces (AN0-AN3) away from digital switching signals and the oscillator traces (OSC1/OSC2) to minimize coupled noise. The PIC16LC71's 8-bit ADC has modest ~60 dB SNR; clean analog layout can be the difference between a working and marginal sensor reading. Place the external oscillator crystal (or ceramic resonator) within 0.5 inches of the OSC1/OSC2 pins with grounded guard traces, and use a series resistor with crystal oscillators to control drive level and prevent over-excitation.
Thông tin tuân thủ
RoHS and lead-free status not explicitly stated in the verified data. PIC16LC71X family is part of Microchip's legacy OTP product line predating widespread RoHS transition. For RoHS-compliant new designs, migrate to PIC16F88A-I/SO.