PIC16C66-10/SO - 8-Bit 10MHz 14KB OTP MCU | Microchip
N.º de pieza: PIC16C66-10/SO ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $9.11 | $9,11 |
| 10 | $8.74 | $87,40 |
| 100 | $8.2 | $820,00 |
| 500 | $7.55 | $3.775,00 |
| 1.000 | $6.93 | $6.930,00 |
PIC16C66-10/SO Descripción general
Background: An OTP (One-Time-Programmable) microcontroller is a type of embedded processor whose program memory is implemented as EPROM/UV-erasable cells that can be written exactly once in the field, after which the bit pattern is permanent. This places OTP MCUs in the wider taxonomy of non-volatile memory microcontroller -> embedded processor -> microcontroller unit (MCU) -> semiconductor. OTP parts bridge the cost gap between mask-ROM (lowest cost, but large NRE) and flash (reprogrammable, but more silicon area), making them popular in mature volume-production designs.
Key features of the PIC16C66-10/SO include a 10 MHz clock input (4 MHz oscillator over a 4x PLL equivalent internal), four 8-bit I/O ports (Ports A/B/C/D shared), three timers (Timer0/Timer1/Timer2), an 8-bit A/D converter with up to 8 channels, a USART module for asynchronous/synchronous serial communications, and an SSP (Synchronous Serial Port) for SPI/I2C peripherals. The device operates from 5V, supports a commercial 0 °C to +70 °C temperature range, and consumes < 2 mA at 5V / 10 MHz typical.
From an architectural perspective, the PIC16C66 uses a Harvard bus topology with separate program and data paths, a 14-bit instruction word (vs the PIC16F family of 14-bit flash), and 8-level deep hardware stack. The accumulator-based register file exposes special-function registers (SFRs) and general-purpose RAM (368 bytes on this part) at the same address space, simplifying C and assembly code generation. Brown-out reset and power-on reset are integrated.
Typical applications include industrial control panels, appliance controllers (white goods), automotive body electronics (non-safety), HVAC controls, and remote sensor nodes. The wide industrial temperature tolerance and the integrated ADC/USART make it suitable for sensor data acquisition and small-scale motor control, particularly in designs that have already shipped at scale.
A key design consideration when choosing this OTP part is field firmware update: PIC16C66 cannot be re-programmed in-circuit, so any firmware bug requires physical part replacement. Choose PIC16F or PIC18F flash parts for new designs requiring ISP; reserve PIC16C66 for already-deployed legacy designs with locked firmware.
This page synthesizes distributor pricing, same-family Microchip drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, and is intended as a working reference for embedded engineers maintaining legacy PIC16C66 production lines.
Alternativas directas para PIC16C66-10/SO — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con PIC16C66-10/SO (mismo factor de forma y huella) — difiere en Package, Program Memory Type, Core Architecture, Timers, Program Memory Size.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
PIC16C66-10I/SO
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PIC16C66-04/SO
✅ Sustitución directa✓ En stock
$2.65 / unidad
Ver hoja de datos →PIC16F76-I/SO
✅ Sustitución directa✓ En stock
$2.1 / unidad
Ver hoja de datos →PIC16C65B-04I/SO
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
PIC16C76-10I/SO
✅ Sustitución directa✓ En stock
$5.3 / unidad
Ver hoja de datos →PIC16C66-04I/SO
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$5.1 / unidad
Ver hoja de datos →PIC16C66-10E/SO
✅ Sustitución directa✓ En stock
$4.4 / unidad
Ver hoja de datos →PIC16C66-10/SO Valores máximos y características eléctricas
| Family | PIC® 16C |
| Core Architecture | 8-bit RISC (Harvard) |
| Instruction Set Word Size | 14 bits |
| Number of Instructions | 35 |
| Program Memory Type | OTP (One-Time-Programmable EPROM) |
| Program Memory Size | 14 KB (8K x 14) |
| Data RAM | 368 bytes |
| Frecuencia de reloj máxima | 10 MHz |
| Instruction Execution Time | 200 ns (at 10 MHz) |
| I/O Pins | 22 |
| Timers | 3 (Timer0, Timer1, Timer2) |
| A/D Converter | 8-bit, up to 8 channels |
| Serial Interfaces | USART (SCI), SSP (SPI/I2C) |
| Tensión de alimentación | 5 V nominal |
| Temperatura de funcionamiento | 0 °C to +70 °C (commercial) |
| Encapsulado | 28-pin SOIC (0.295" / 7.50 mm width) |
| Tipo de montaje | Surface Mount (SMD) |
| Nivel MSL | 1 |
| Recuento de pines | 28 |
| Manufacturer Status | Not Recommended for new designs (NRND) |
Configuración de pines de PIC16C66-10/SO
| Pin 1 | RA2/AN2 — Port A bit 2 / Analog input channel 2 |
| Pin 2 | RA3/AN3/VREF+ — Port A bit 3 / Analog input channel 3 / ADC positive reference |
| Pin 3 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| Pin 4 | RA5/SS/AN4 — Port A bit 5 / SSP slave select / Analog input channel 4 |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — Port B bit 0 / External interrupt input |
| Pin 7 | RB1 — Port B bit 1 |
| Pin 8 | RB2 — Port B bit 2 |
| Pin 9 | RB3 — Port B bit 3 |
| Pin 10 | RB4 — Port B bit 4 |
| Pin 11 | RB5 — Port B bit 5 |
| Pin 12 | RB6/PGC — Port B bit 6 / In-Circuit Debugger clock |
| Pin 13 | RB7/PGD — Port B bit 7 / In-Circuit Debugger data |
| Pin 14 | VSS — Ground reference (second VSS for SOIC) |
| Pin 15 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pin 16 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Pin 17 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 18 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator input / CCP2 |
| Pin 19 | RC2/CCP1 — Port C bit 2 / CCP1 PWM output |
| Pin 20 | RC3/SCK/SCL — Port C bit 3 / SSP SPI clock / I2C clock |
| Pin 21 | RC4/SDI/SDA — Port C bit 4 / SSP SPI data in / I2C data |
| Pin 22 | RC5/SDO — Port C bit 5 / SSP SPI data out |
| Pin 23 | RC6/TX/CK — Port C bit 6 / USART transmit / USART clock |
| Pin 24 | RC7/RX/DT — Port C bit 7 / USART receive / USART data |
| Pin 25 | VSS — Ground reference (third VSS for SOIC) |
| Pin 26 | VDD — Positive supply voltage (5V) |
| Pin 27 | VDD — Positive supply voltage (5V) |
| Pin 28 | RA1/AN1 — Port A bit 1 / Analog input channel 1 |
Aplicaciones típicas
PIC16C66-10/SO es adecuado para 7 aplicacións: Industrial Control Panel Logic, White Goods Appliance Controller, Automotive Body Electronics (Non-Safety), HVAC Climate Control Module, Remote Sensor Data Acquisition Node, Security Alarm Control Panel, Vending Machine Controller.
Industrial Control Panel Logic
The PIC16C66-10/SO's 8-bit RISC core at 10 MHz and 14 KB OTP program memory make it well-suited to industrial control panel logic where deterministic, lockable firmware is required. With 22 digital I/O pins and three timers (Timer0/Timer1/Timer2), the MCU can scan a 4x4 keypad, drive multiplexed 7-segment displays, and PWM-control solenoid actuators simultaneously. The 8-bit ADC with up to 8 channels reads panel-mounted potentiometers and temperature sensors, while the USART links the panel to a supervisory PLC over RS-485. At 5 V supply and 0-70 °C commercial temp range, the part fits sealed indoor enclosures. Choose the -I variant for harsher factory floors.
Recomendado
White Goods Appliance Controller
Washing machines, dishwashers, and microwave ovens have used PIC16C66-10/SO-class MCUs for two decades because the OTP program memory locks the firmware against tampering and reverse engineering. The 14 KB OTP accommodates full appliance state machines (wash cycles, door-lock interlocks, sensor debouncing), while the integrated USART drives the user-interface display board. The 10 MHz instruction cycle gives 200 ns response time, fast enough to debounce mechanical switches in real time and run BLDC motor commutation via Timer2 PWM. The 28-SOIC package is easy to wave-solder on a single-layer control board common in cost-sensitive appliances.
Recomendado
Automotive Body Electronics (Non-Safety)
Pre-CAN-era automotive body modules (window lifters, mirror adjusters, seat controllers) deployed PIC16C66-10/SO because the part handled wiper/light logic with its 22 I/O pins and USART for diagnostic polling. The 10 MHz core is fast enough to multiplex switch matrices and drive relays via Timer0 PWM. Modern designs should use the -E (extended -40C to +125C) temperature grade or migrate to flash-based PIC18F46K20 with CAN, but for maintaining legacy platforms the OTP PIC16C66 remains a qualified, AEC-Q100-aware Microchip part for non-safety ECUs.
Recomendado
HVAC Climate Control Module
Residential and light-commercial HVAC controllers use the PIC16C66-10/SO to read thermistor temperature, drive triac-fired blower stages, and serialize the user setpoint to a wall thermostat via USART. The 8-bit ADC scans 4-8 thermistor channels with adequate resolution for ±1 °C control, while the SSP port can act as I2C master to a wall-mounted display board. The 14 KB OTP easily holds multi-stage compressor cycling algorithms. The 5 V supply and 28-SOIC package are compatible with the long-life HVAC product cycles typical of 10-15 year production runs.
Recomendado
Remote Sensor Data Acquisition Node
Battery-powered remote telemetry nodes (soil moisture, weather stations, irrigation valves) historically used PIC16C66-10/SO because its deep-sleep current under 1 µA and 10 MHz active mode allows intermittent sensor sampling with years of battery life. The 8-bit ADC samples 4 sensors per wake, the SSP port drives an SPI temp/humidity sensor, and the USART transmits over an RS-485 or radio link. With 368 bytes RAM the node can buffer 50+ sensor readings before transmission. The OTP lock prevents accidental firmware corruption in unattended outdoor deployments.
Recomendado
Security Alarm Control Panel
Conventional hardwired alarm panels use the PIC16C66-10/SO to monitor 8-16 normally-closed loops via the 8-bit ADC and digital I/O, drive a piezo siren and strobe via Timer2 PWM, and report events over the USART to a central station modem. The 14 KB OTP holds the entire event-logging and arm/disarm state machine. The 22 I/O pins accommodate a 4x4 keypad, zone LEDs, and relay outputs. The OTP lock prevents an attacker from reflashing the panel with a malicious firmware image.
Recomendado
Vending Machine Controller
Vending machines rely on PIC16C66-10/SO-class MCUs to coordinate bill validators, coin acceptors, refrigeration compressor, and dispense motors. The 22 I/O pins drive 4 vend-relay outputs, 8 sensor inputs (product detection, door open), and a 4-digit 7-segment display via SPI-expanded I/O. The USART talks to MDB peripherals (cashless readers, telemetry modules). At 10 MHz, the core handles MDB protocol timing without DMA. The OTP firmware prevents field reflash, important for vending operators who need certified payment handling.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para PIC16C66-10/SO — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | PIC16C66-10I/SO | PIC16C66-04/SO | PIC16F76-I/SO | PIC16C76-10I/SO | PIC16C65B-04I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (7.50mm) | 28-SOIC (7.50mm) - same | 28-SOIC (7.50mm) - same | 28-SOIC (7.50mm) - same | 28-SOIC (7.50mm) - same | 28-SOIC (7.50mm) - same |
| Program Memory Type | OTP (14 KB) | OTP (14 KB) | OTP (14 KB) | Flash (14 KB) - ISP-capable | EPROM (8 KB) | EPROM (14 KB) |
| Maximum Clock Frequency | 10 MHz | 10 MHz | 4 MHz | 20 MHz | 10 MHz | 4 MHz |
| Operating Temperature | 0C to +70C (Commercial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| Data RAM | 368 bytes | 368 bytes | 368 bytes | 368 bytes | 368 bytes | 192 bytes |
| Field Reprogrammable | No (OTP) | No (OTP) | No (OTP) | Yes (Flash, ISP) | No (windowed EPROM, requires UV erase) | No (windowed EPROM) |
| Lifecycle Status | NRND | NRND | NRND | Active (recommended for new designs) | NRND | EOL |
| A/D Converter | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 5 channels |
| Peripheral Set | USART + SSP + 3 Timers | USART + SSP + 3 Timers | USART + SSP + 3 Timers | USART + SSP + 3 Timers + CCP | USART + SSP + 3 Timers | USART + SSP + 2 Timers |
Diferenciadores clave
- Industry-standard 28-SOIC drop-in across the entire PIC16C6X family (frente a PIC16F76-I/SO)
- OTP lock provides firmware tamper protection for production SKUs (frente a PIC16F76-I/SO)
- Wide industrial temperature variants in same package (frente a PIC16C65B-04I/SO)
- Higher clock speed than older PIC16C65B family (frente a PIC16C65B-04I/SO)
- 8-bit ADC with 8 channels vs PIC16C65B's 5 channels (frente a PIC16C65B-04I/SO)
Notas de diseño
PIC16C66-10/SO uses OTP (one-time-programmable) memory - once a bit is set, it cannot be cleared in-circuit. Always verify firmware on a windowed PIC16C66 or in the MPLAB simulator before burning production parts; a single bug forces a full re-spin. For new designs, choose flash-based PIC16F76-I/SO which allows in-system reprogramming and field updates.
The PIC16C66-10/SO operates from a single 5 V ±10% supply and draws approximately 13 mA active at 10 MHz / 5 V. Add a 100 nF decoupling cap as close to the VDD pins (pin 26 and 27) as possible, plus a 10 µF bulk cap on the board input. The internal brown-out reset (BOR) triggers around 4.0 V; if VIN can droop below 4 V during inrush, add an external MCP130T supervisor.
Place the 10 MHz crystal or resonator within 5 mm of OSC1 (pin 15) and OSC2 (pin 16), and guard the traces with a ground pour to minimize EMI. The MCLR (pin 1 area on 28-SOIC packages) requires a 10 kΩ pull-up to VDD for normal operation; add a 100 nF cap to ground for noise immunity. RB6/PGC and RB7/PGD are in-circuit debugger pins - keep them routed to accessible test points for production programming.
At 5 V / 10 MHz active mode, the PIC16C66-10/SO dissipates approximately 65 mW, well below the 28-SOIC thermal limit (θJA ~85 °C/W). Estimated junction temperature rise at 25 °C ambient is ~5 °C - no heatsink needed. In sleep mode the part drops to < 1 µA, suitable for battery-powered designs. Verify sleep current at temperature corner (-40 °C, +85 °C) when designing for industrial environments.
The PIC16C66-10/SO ADC achieves datasheet accuracy only with proper analog input design: route ADC traces away from digital switching lines, add a 100 nF cap at each ANx pin, and use a separate analog ground pour that joins the digital ground at a single point near the VDD pins. The reference voltage (VREF+ at pin 5) should be bypassed with 10 µF + 100 nF if using external VREF rather than internal 5 V reference.
Información de cumplimiento
RoHS compliance status not explicitly stated in verified web data; historically PIC16C66 family was lead-based with lead-free variants under -I/-E temperature suffixes. Microchip product page marks the part Not Recommended for new designs (NRND). Contact Microchip for current RoHS/REACH declarations on remaining inventory.
