PIC16LC71T-04/SO - 8-Bit 4MHz MCU 1.75KB OTP 18-SOIC | Microchip
N.º da peça: PIC16LC71T-04/SO ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $3.95 | $3,95 |
| 10 | $3.65 | $36,50 |
| 100 | $3.15 | $315,00 |
| 500 | $2.78 | $1.390,00 |
| 1.000 | $2.45 | $2.450,00 |
PIC16LC71T-04/SO Visão geral
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.
Alternativas drop-in para PIC16LC71T-04/SO — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com PIC16LC71T-04/SO (mesmo formato e footprint) — diferindo em Package, Timers, Core Architecture, Data EEPROM, Watchdog Timer.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
PIC16LC71-04/SO
✅ Drop-In✓ Em estoque
$4.1 / unidade
Ver ficha técnica →PIC16LC71T-04I/SO
✅ Drop-In✓ Em estoque
$1.75 / unidade
Ver ficha técnica →PIC16LC711T-04E/SO
✅ Drop-In✓ Em estoque
$4.32 / unidade
Ver ficha técnica →PIC16LC711-04I/SO
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$3.78 / unidade
Ver ficha técnica →PIC16LC711-04/SO
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$1.85 / unidade
Ver ficha técnica →PIC16LC71T-04/SO Classificações máximas e características elétricas
| 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 |
| Frequência máxima de clock | 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) |
| Tipo de montagem | 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) |
Configuração de pinos do PIC16LC71T-04/SO
| Pino 1 | MCLR — Master Clear Reset input (active low) |
| Pino 2 | RA0/AN0 — Port A bit 0 / ADC channel 0 input |
| Pino 3 | RA1/AN1 — Port A bit 1 / ADC channel 1 input |
| Pino 4 | RA2/AN2 — Port A bit 2 / ADC channel 2 input |
| Pino 5 | RA3/AN3/VREF — Port A bit 3 / ADC channel 3 / ADC voltage reference |
| Pino 6 | RA4/T0CKI — Port A bit 4 (open-drain) / Timer0 clock input |
| Pino 7 | VSS — Ground reference (0V) |
| Pino 8 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pino 9 | OSC2/CLKOUT — Oscillator crystal output / clock output (Fosc/4) |
| Pino 10 | RB0/INT — Port B bit 0 / external interrupt input |
| Pino 11 | RB1 — Port B bit 1 (digital I/O) |
| Pino 12 | RB2 — Port B bit 2 (digital I/O) |
| Pino 13 | RB3 — Port B bit 3 (digital I/O) |
| Pino 14 | RB4 — Port B bit 4 (digital I/O, interrupt-on-change) |
| Pino 15 | RB5 — Port B bit 5 (digital I/O, interrupt-on-change) |
| Pino 16 | RB6 — Port B bit 6 (digital I/O, interrupt-on-change, ICSP clock) |
| Pino 17 | RB7 — Port B bit 7 (digital I/O, interrupt-on-change, ICSP data) |
| Pino 18 | VDD — Positive supply voltage (+5V typical) |
Aplicações típicas
PIC16LC71T-04/SO é adequado para 6 aplicaçãos: 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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PIC16LC71T-04/SO — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | 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 |
Principais diferenciais
- Tube-packaged identical-die alternative (vs PIC16LC71-04/SO)
- Industrial temperature variant available (vs PIC16LC71T-04I/SO)
- Pin-compatible upgraded PIC16LC711 family (vs PIC16LC711T-04E/SO)
Notas de projeto
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.
Informações de conformidade
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.