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PIC16C66-20E/SO

PIC16C66-20E/SO - 8-Bit 20MHz OTP MCU 14KB | Microchip

The Microchip Technology PIC16C66-20E/SO is an 8-bit RISC microcontroller from the PIC16C6X family, featuring a 20 MHz maximum clock speed, 14KB (8K x 14) of One-Time-Programmable (OTP) program memory, and 368 bytes of data RAM in a 28-pin SOIC package. The -20 speed grade denotes the 20 MHz operation, and the E suffix indicates the extended automotive temperature range suitable for harsh-environment designs. The device operates from a 4V to 5.5V supply and exposes 22 digital I/O pins across ports A, B, and C for peripheral interfacing. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/EPROM/OTP/Flash), data RAM, timers, serial communication peripherals, and I/O on one die. MCUs sit at the lowest tier of the embedded computing hierarchy below microprocessors (MPUs), digital signal controllers (DSCs), and application processors. The PIC16C6X architecture in particular is a Harvard RISC design with 35 single-word instructions, single-cycle execution (except program branches which take two), and DC-to-20 MHz clock input capability, giving it a deterministic instruction throughput that is well suited to real-time control loops. Key features of the PIC16C66-20E/SO include three timers (Timer0, Timer1, Timer2), a USART for asynchronous and synchronous serial communication, an MSSP module supporting SPI and I2C, an 8-bit ADC with 5 input channels on some variants of the family, and a capture/compare/PWM (CCP) module. The OTP program memory is field-programmable using a standard device programmer such as the MPLAB PM3, and the device is fabricated in CMOS technology for low power consumption. Typical applications include industrial control subsystems, automotive body and chassis electronics, sensor signal conditioning front-ends, low-cost consumer appliances, and legacy embedded products that require a stable 5V 8-bit MCU with proven PIC16 architecture compatibility. The extended temperature grade makes this part especially attractive where commercial-grade parts would fail thermally. When designing with the PIC16C66-20E/SO, ensure that the supply rail is regulated within 4V to 5.5V and that decoupling is placed close to VDD/VSS pins. Note that OTP memory cannot be erased - for development cycles consider the PIC16F66 or PIC16C66-JW (windowed EPROM) variant, both sharing the same 28-pin footprint. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C66-20E/SP

PIC16C66-20E/SP - 8-Bit 20MHz OTP MCU 14KB | Microchip

The Microchip Technology PIC16C66-20E/SP is an 8-bit CMOS microcontroller from the PIC16C6x family, featuring a 20 MHz maximum operating frequency, 14 KB (8K x 14) of One-Time-Programmable (OTP) program memory, and 368 bytes of RAM, housed in a 28-pin SPDIP (Skinny Plastic DIP) through-hole package. The -20E suffix denotes the 20 MHz speed grade with Extended temperature range (-40C to +125C), and the /SP suffix indicates the SPDIP-28 package. The device integrates 22 digital I/O pins organized across multiple ports (PORTA, PORTB, PORTC, PORTD, PORTE), three timer/counters (Timer0, Timer1, Timer2), a 10-bit PWM module, and a USART supporting both SPI and I2C (MSSP) master/slave modes. An 8-bit microcontroller (MCU) is a single-chip computer that integrates an 8-bit CPU, program memory, data RAM, and configurable I/O peripherals. It belongs to the broader hierarchy: microcontroller -> embedded processor -> semiconductor -> integrated circuit. The PIC16C6x family specifically belongs to Microchip's mid-range PIC architecture (14-bit instruction word, 35 single-word instructions), which sits between the baseline PIC10/12/16 family and the high-end PIC17/18 family. Key features include a wide operating voltage range of 2.5V to 6.0V, ultra-low power consumption (15 uA typical at 5V/4 MHz, 1 uA typical at 3V/32 kHz), brown-out reset and power-on reset for robust operation, and a watchdog timer for fail-safe recovery. The fully static CMOS design allows clock frequencies down to DC, and the Harvard architecture separates program and data buses for predictable single-cycle instruction execution (except program branches, which take two cycles). The PIC16C66 employs Microchip's classic two-stage pipeline with 14-bit-wide OTP EPROM program memory. The 8-bit ALU operates on a 368-byte general-purpose RAM with hardware banking support, and the 22 I/O pins are individually bidirectional with TTL/CMOS-compatible input thresholds and programmable weak pull-ups on PORTB. The MSSP peripheral implements both I2C master/slave and SPI master/slave, and the enhanced USART provides asynchronous and synchronous serial communication for embedded networking. Typical applications include industrial control and automation, motor control (using the PWM and timers), sensor interfacing via I2C/SPI, embedded data acquisition, HVAC controllers, security alarm panels, and automotive body electronics. The Extended temperature range allows operation in harsh environments. Designers should note that OTP memory cannot be re-programmed in-circuit - any firmware revision requires a new device. Consider the PIC16F66 Flash variant for development and field updates. Always use an external oscillator or crystal for timing-sensitive UART communication; the internal oscillator is not available on this OTP-based PIC16C6x member. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet - including same-family variants, Flash replacements, and pin-compatible PIC16C6x siblings for legacy design migration.

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PIC16C66-20I/SO

PIC16C66-20I/SO - 8-Bit 20MHz OTP MCU 14KB | Microchip

The Microchip Technology PIC16C66-20I/SO is an 8-bit CMOS OTP microcontroller from the PIC16C6X family, operating at up to 20 MHz and delivering 14 KB (8K x 14) of one-time-programmable program memory in a 28-pin SOIC package. It integrates 368 bytes of RAM, 22 digital I/O lines, three timer/counter modules, a USART, an MSSP module that supports SPI and I2C, an 8-bit ADC with up to 8 channels, and a capture/compare/PWM peripheral. What is a PIC16C microcontroller? The PIC16C family is a classic mid-range 8-bit RISC microcontroller platform from Microchip, characterized by 35 single-word instructions, single-cycle execution (except program branches), Harvard architecture with separate program and data buses, and a wide operating voltage range. The OTP (One-Time Programmable) variant stores firmware in EPROM cells, providing one-time field programming through an external programmer such as the MPLAB PM3 - this makes PIC16C parts particularly suited for production runs where cost is critical but the firmware is finalized. Key features include DC to 20 MHz clock input, 200 ns instruction cycle, 8 channels of 8-bit ADC, two 8-bit timers plus one 16-bit timer, USART with 9-bit address masking, 8-level deep hardware stack, and on-chip watchdog timer with its own RC oscillator. The brown-out reset and power-on reset circuits protect against unstable supply conditions. The PIC16C66 uses a 14-bit instruction word Harvard architecture with separate code and data paths, enabling single-cycle instruction execution for most opcodes. The integrated analog and digital peripherals share I/O pins through programmable multiplexers, and interrupts are vectored with priority support. Industrial-grade -40C to +85C operating range and OTP program memory make this device best for cost-optimized production runs. Typical applications include industrial control systems, motor control, sensor interface nodes, embedded instrumentation, simple HMI panels, and white-goods appliances. The wide peripheral set allows designers to consolidate multiple discrete functions onto a single MCU. When designing with the PIC16C66, ensure programmer compatibility before committing to OTP for new designs - many modern designs prefer PIC16F flash variants for in-circuit reprogrammability. The pin-compatible PIC16F876 offers 14KB flash memory and is recommended for new development. This page synthesizes distributor pricing, drop-in compatible alternatives from the same Microchip PIC16C family, and practical design guidance not found in the standalone datasheet.

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PIC16C66-20I/SP

PIC16C66-20I/SP - 8-Bit 20MHz OTP MCU, 14KB, 28-SPDIP | Microchip

The Microchip Technology PIC16C66-20I/SP is an 8-bit PIC16C-family CMOS microcontroller built on EPROM/ROM technology, delivering 20 MHz CPU performance with 14KB (8K x 14) of One-Time-Programmable (OTP) program memory in a 28-pin SPDIP package. It provides 368 bytes of RAM, 22 digital I/O lines, and an integrated peripheral set including a Brown-out Reset, Power-on Reset, PWM module, Watchdog Timer, and serial interfaces (I2C, SPI, USART). The industrial-grade -I suffix guarantees -40C to +85C operation, and the wide 4V to 6V supply range suits 5V system rails commonly used in legacy industrial controllers, automotive subsystems, and embedded instrumentation. An 8-bit OTP microcontroller is a single-chip computer that integrates a CPU, non-volatile program memory (programmable once), data memory, and peripherals on one die; it sits within the broader hierarchy of microcontrollers -> embedded processors -> semiconductors. The PIC16C6x family targets cost-sensitive, deterministic real-time control applications where the simplicity of a RISC instruction set, predictable interrupt latency, and proven long-term supply continuity outweigh the need for in-system reprogrammability. OTP parts are typically chosen for volume production where code is finalized and field updates are not expected. Key differentiating features include the 35-instruction RISC core (every instruction executes in a single cycle except program branches, which take two cycles), a Harvard architecture with separate program and data buses, and an operating speed range that scales linearly with the external oscillator from DC up to 20 MHz. The device supports fully static operation, allowing the clock to be stopped for ultra-low standby power consumption. The 22 I/O pins each feature independent direction control, with several pins multiplexed to the synchronous serial port (SSP), USART, and capture/compare/PWM (CCP) peripherals. Brown-out Reset and Power-on Reset provide robust supply-voltage supervision, while the Watchdog Timer guards against code lockups in unattended deployments. Typical applications span legacy industrial automation, HVAC control boards, automotive body controllers, instrumentation front-ends, and consumer appliance controllers. The wide 4V-6V supply tolerance allows the device to operate directly from unregulated 5V rails commonly found in industrial cabinets and 12V/24V systems with simple linear regulation. The combination of OTP memory and -I industrial temperature grade makes the PIC16C66-20I/SP especially attractive for high-reliability, low-cost, fixed-code deployments. When designing with this part, allocate the 28-SPDIP footprint carefully because the through-hole pin pitch of 2.54 mm and 7.62 mm row spacing consume significant PCB real estate versus SOIC or QFP alternatives. Confirm oscillator type (XT, HS, RC, LP) and external component values against the datasheet's oscillator configuration section, because the 20 MHz maximum rating requires HS-mode crystal selection. Designers transitioning from PIC16C66 to PIC16F877 or other flash-based siblings should review the pin and code compatibility chart before committing to a footprint swap. This page consolidates distributor pricing, drop-in PIC16C6x alternatives, and practical design notes that go beyond the manufacturer datasheet, giving engineers a single source for sourcing, comparison, and second-source decisions on long-lifecycle PIC16C66 designs.

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PIC16C66/JW

PIC16C66/JW - 8-Bit 20MHz 14KB EPROM MCU | Microchip | 28-CDIP

The Microchip PIC16C66/JW is an 8-bit RISC CMOS microcontroller in a 28-pin ceramic DIP (CDIP-28) windowed package, executing instructions at up to 20MHz from a 14KB (8K x 14) UV-erasable EPROM program memory. It integrates 368 bytes of RAM, 22 digital I/O lines, and the legacy PIC16C mid-range core with only 35 single-word instructions to learn. The '/JW' suffix denotes the windowed ceramic DIP variant used for development and prototype erasure via UV exposure. A microcontroller (MCU) is a single-chip computer containing a CPU, memory (program + data), and peripherals. The PIC16C66 belongs to the PIC16C family of OTP/EPROM-based 8-bit MCUs from Microchip Technology, positioned in the broader hierarchy: PIC16C66 -> PIC16C mid-range family -> PIC16 8-bit MCU family -> PIC microcontroller -> microcontroller -> embedded IC -> semiconductor. EPROM-based MCUs like the PIC16C66 were the dominant in-system programmable solution before flash memory became standard in mid-range microcontrollers. Key features of the PIC16C66 include fully static operation, wide operating voltage from 2.5V (low-power) to 6.0V, low power consumption of 15 uA typical at 5V/4MHz and 1 uA at 3V/32kHz, three timers (Timer0, Timer1, Timer2), a USART for serial communication, a Capture/Compare/PWM (CCP) module, an 8-bit ADC with multiple channels, and a watchdog timer for reliable operation. It supports commercial, industrial, and extended temperature ranges and offers programmable code protection. The PIC16C66 uses a Harvard architecture with separate program and data buses, allowing instruction fetch and data access to occur in the same clock cycle. Most instructions execute in a single cycle except program branches which take two, giving an effective throughput close to 200ns per instruction at 20MHz. The EPROM windowed ceramic package allows the program memory to be erased and reprogrammed multiple times during development. Typical applications include industrial control systems, automotive subsystems (pre-CAN era), appliance controllers, instrumentation, and legacy embedded products designed in the 1990s. The windowed CDIP-28 form factor makes it convenient for breadboard and engineering prototype use, where UV erasure is feasible. When designing with this device, note that the EPROM-based PIC16C66 has been superseded by flash-based equivalents such as the PIC16F76 in the same 28-pin SPDIP footprint. Modern designs should migrate to flash-based parts unless EPROM windowed erasure is specifically required. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, including pin-compatibility guidance for migration to PIC16F and PIC16C6x flash variants.

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PIC16C662-04/P

PIC16C662-04/P - 8-Bit CMOS OTP MCU, 7KB, 33 I/O | Microchip

The Microchip Technology PIC16C662-04/P is a 40-pin PDIP-packaged 8-bit CMOS OTP microcontroller from the PIC16C family, featuring 7KB of one-time-programmable program memory organized as 4K x 14 words and 176 bytes of RAM. It operates from a 4.5V to 5.5V supply and runs at a maximum clock speed of 4MHz (200 ns instruction cycle), with all instructions executing in a single cycle except program branches which take two cycles. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and programmable I/O peripherals on one die. The PIC architecture, originally derived from General Instrument's PIC1640, uses a Harvard design with separate program and data buses, a RISC instruction set, and a hardware stack. PIC16C microcontrollers in the mid-1990s were widely used in embedded control applications such as appliance controllers, automotive subsystems, and industrial instrumentation. Within the broader taxonomy, PIC16C662 belongs to the PIC16C6x family — a sub-family of Microchip's PICmicro MCU lineup, which itself sits within the category of 8-bit microcontrollers, MCUs, embedded processors, and finally semiconductors. Key features include 33 digital I/O pins, two analog comparators, programmable code protection, and a watchdog timer with on-chip RC oscillator. The CMOS process delivers low power consumption suitable for both commercial and industrial embedded designs. The '04' speed suffix denotes the 4MHz maximum clock, while the '/P' suffix denotes a 40-pin PDIP (Plastic DIP) through-hole package. The PIC16C662 implements Microchip's enhanced mid-range core, providing 35 single-word instructions, an 8-level hardware stack, and a 14-bit instruction word. The OTP program memory is one-time programmable, meaning each blank device can be written exactly once — a cost-effective approach for low- and medium-volume production runs where flash reprogrammability is not required. Typical applications include appliance control (washing machines, microwave ovens), automotive body electronics (instrument clusters, lighting controllers), industrial motor control, security alarm panels, and general-purpose embedded logic replacement. The PIC16C662's analog comparators also make it suitable for sensor interface circuits in HVAC and process control. When designing with this device, note that OTP memory cannot be erased; engineers should verify code thoroughly using an erasable windowed version (e.g., PIC16CR662) or a flash-based pin-compatible equivalent (e.g., PIC16F877A) during development before committing to production. A 40-pin PDIP footprint simplifies prototype breadboarding and rework in through-hole designs. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, helping engineers evaluate sourcing risk and second-source options for legacy designs.

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PIC16C662-04/PQ

PIC16C662-04/PQ - 8-bit OTP MCU, 7KB, 33 I/O | Microchip | MQFP-44

The Microchip Technology PIC16C662-04/PQ is an 8-bit CMOS OTP (One-Time-Programmable) microcontroller based on the PIC16C66 architecture, a modified Harvard design packing 7 KB of program memory, 176 bytes of RAM, and 33 digital I/O pins in a 44-lead MQFP (PQ) plastic package. It executes one instruction every 200 ns at a 4 MHz oscillator input (4 MHz / 4 = 1 MIPS), and the -04 speed grade specifies the 4 MHz maximum oscillator frequency. A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory (here OTP EPROM), working RAM, and a set of on-chip peripherals such as timers, capture/compare/PWM modules, a watchdog timer, and analog comparators. Within the broader semiconductor hierarchy, an MCU belongs to the embedded processor family, sitting between simple microcontrollers and 16/32-bit MPUs in compute capability. The PIC16C66x series targets cost-sensitive, deterministic real-time control tasks where its 35 single-word instruction set and 14-bit instruction word keep code density high and interrupt latency predictable. Key features of the PIC16C662-04/PQ include 7 KB EPROM program memory, 176 bytes of data RAM, 33 I/O pins, two 8-bit and one 16-bit timer/counter modules, a watchdog timer with its own on-chip RC oscillator, two analog comparators, and a programmable code-protection mechanism. Operating voltage spans 3.0 V to 6.0 V over commercial, industrial, and extended temperature grades, with typical active current around 2 mA at 5 V / 4 MHz and standby currents in the microamp range at low clock rates. The architecture is a RISC-like design with a two-stage pipeline, separate program and data buses (modified Harvard), and a 14-bit program word that carries both opcode and literal data. OTP EPROM programming is performed via Microchip's standard in-circuit serial programming interface, allowing field programming of unprogrammed parts before conformal coating or final test. Typical applications include white-good and small-appliance control boards, HVAC blower and thermostat controls, automotive interior accessories (non-safety-critical), industrial sensor interfaces, simple remote keyless entry transmitters, and low-cost remote sensor nodes. The combination of on-chip comparators and PWM makes it well suited to closed-loop fan, pump, and solenoid control. A key design tip: because the part uses OTP EPROM, firmware must be fully validated before programming the production lot - there is no field re-programmability. Place decoupling capacitors (100 nF ceramic plus 10 uF bulk) within 5 mm of VDD/VSS, and route the OSC1/OSC2 traces over a continuous ground pour to limit EMI coupling into the analog comparator inputs. This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical design guidance not found in the manufacturer datasheet alone.

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PIC16C662-04E/L

PIC16C662-04E/L - 4MHz 8-bit OTP MCU, 7KB, 44-PLCC | Microchip

The Microchip Technology PIC16C662-04E/L is a high-performance, OTP-based 8-bit RISC microcontroller from the PIC® 16C family, delivering 4 MIPS (4 MHz clock) of compute throughput, 7 KB (4K x 14) of one-time-programmable program memory, and integrated peripherals in a 44-pin PLCC (J-lead, 16.59 x 16.59 mm) package qualified to the automotive temperature grade. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces onto one silicon die. Within the broader semiconductor taxonomy, an MCU belongs to the digital IC family, which itself sits inside the integrated circuits hierarchy; the PIC® 16C line specifically is built on a RISC Harvard architecture with separate program and data buses, and OTP program memory means the firmware is permanently written at the factory or by a programming tool and cannot be electrically erased thereafter. Compared with modern flash-based MCUs, OTP parts trade off field re-programmability for a lower unit cost, making them typical choices for high-volume, code-stable applications. The PIC16C662-04E/L is built around a 14-bit instruction word and executes every instruction in a single 200 ns cycle at 4 MHz; only 35 single-word instructions are required to cover the entire instruction set, which simplifies assembler programming and reduces code density. The '04E' suffix designates a 4 MHz maximum clock with the enhanced (-40 °C to +125 °C) industrial/automotive temperature range, while the '/L' package code denotes the 44-pin PLCC J-lead (PLCC-44) format. The device integrates a 10-bit successive-approximation ADC, dual analog comparators, a USART, an SSP/SPI/I²C master/slave port, a parallel slave port, three timer/counters (8-bit and 16-bit), 33 digital I/O lines, a watchdog timer, and a hardware brown-out reset for automotive-class robustness. Typical automotive and industrial uses include dashboard clusters, climate-control panels, body-electronics modules, sensor-conditioning front-ends, and simple user-interface controllers. Its integrated ADC and comparator peripherals allow direct connection to thermistors, potentiometers, and 0-5 V analog sensors without external signal conditioning. The wide operating temperature window and proven OTP architecture also make it a fit for low-cost point-of-sale terminals, appliance controllers, and instrument-cluster segments where firmware stability over a 10-year production run outweighs the need for in-system flash updates. When designing with this part, observe the OTP-programming model: code must be committed by the time the device leaves the factory or by a third-party programmer before PCB assembly; there is no in-application rewrite path. Also reserve budget for the PLCC-44 socket footprint on the PCB, since J-lead parts are typically socketed in low-volume builds to allow rework. According to the Microchip PIC16C662 datasheet, the device supports 5 V operation and the enhanced temperature grade ensures the MCU remains within spec across automotive under-hood and cabin environments.

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PIC16C662-04E/P

PIC16C662-04E/P - 4MHz 8-bit OTP MCU, 7KB | Microchip

The Microchip Technology PIC16C662-04E/P is an 8-bit RISC microcontroller in the PIC16C6x family, featuring a 4 MHz maximum clock input, 7 KB (4K x 14) of One-Time-Programmable (OTP) program memory, 33 digital I/O pins, and a 40-pin PDIP (0.600", 15.24 mm) through-hole package. The "-04" speed suffix denotes the 4 MHz clock grade, while the trailing "E" indicates the extended (automotive) temperature grade of -40 C to +125 C, and "/P" identifies the PDIP package. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, peripherals, and I/O onto one die, enabling compact embedded control in appliances, automotive modules, and industrial subsystems. The PIC16C662 belongs to the mid-range PIC architecture, sitting hierarchically between 8-bit microcontrollers and the broader semiconductor / embedded-processing category. Key differentiating features include a 14-bit instruction word, only 35 single-word instructions (most executing in 200 ns), integrated Brown-out Detect/Reset, Power-On Reset (POR), Watchdog Timer (WDT), and LED drive capability on selected ports. The RISC Harvard bus architecture and 8-bit data path deliver deterministic interrupt response for real-time control. Operating from 4.0 V to 6.0 V (4.5 V to 5.5 V typical), the device supports up to 4 MIPS throughput. The OTP program memory makes each unit field-programmable once, ideal for low-to-medium volume production where mask-ROM volume economics are unattractive. Peripherals include an 8-bit timer/counter, capture/compare/PWM, and a synchronous serial port (SSP). Typical applications include industrial automation controllers, automotive body and climate modules (extended temp grade), appliance control boards, and consumer-electronics interfaces. The 33 I/O pins comfortably drive keypads, LED arrays, and small relays. Designers should note that the OTP memory cannot be erased, so firmware must be fully validated on a windowed or Flash equivalent before final programming. Decoupling capacitors (0.1 uF) must be placed within 5 mm of VDD/VSS pins, and unused I/O should be configured as outputs to minimize current draw. This page synthesizes distributor pricing, same-brand drop-in alternatives from the PIC16C6x family, and practical design notes not found in the manufacturer datasheet.

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PIC16C662-04E/PT

PIC16C662-04E/PT - 8-bit OTP MCU 7KB Flash 33 I/O 4MHz | Microchip

The Microchip Technology PIC16C662-04E/PT is a member of the PIC16C6x family of 8-bit CMOS microcontrollers based on the Microchip PIC Harvard architecture, featuring 7KB (4K x 14) of One-Time Programmable (OTP) program memory and 192 bytes of data RAM, housed in a 44-lead TQFP package. It supports 33 digital I/O pins and operates at a maximum clock frequency of 4 MHz, drawing its power from a 3.0 V to 5.5 V supply rail typical of mid-range PIC16C devices. What is an OTP microcontroller? An OTP (One-Time Programmable) microcontroller is a class of MCU whose program memory can be written only once after manufacture, using an external programmer. OTP MCUs occupy the middle ground between mask-ROM devices (lowest cost, programmed at the fab) and Flash MCUs (re-programmable in-circuit). They are common in cost-sensitive, high-volume embedded products where firmware is final and field updates are not required. In the broader taxonomy, an 8-bit OTP MCU belongs to the microcontroller family, which is itself a sub-category of microprocessors and embedded processors within the semiconductor hierarchy. Key features of the PIC16C662-04E/PT include 192 bytes of general-purpose data RAM, a 14-bit instruction word, an integrated timer/counter peripheral set, and a 4 MHz oscillator ceiling. The 33 I/O pins are arranged on Port A, Port B, Port C, Port D, and Port E, supporting digital I/O and select peripheral functions. The '04' speed suffix indicates the 4 MHz maximum operating frequency, while the 'E' suffix designates the Enhanced (-40C to +125C) operating temperature range, making the part suitable for extended industrial environments. From a technical-architecture standpoint, the PIC16C662-04E/PT employs a RISC instruction set with a fixed 14-bit instruction width and an 8-bit data path. The Harvard-style dual-bus architecture separates program and data memory access, allowing instruction fetch and data read to occur in parallel over the same instruction cycle - a feature that historically gave PIC MCUs their deterministic interrupt latency and tight C/MIPS ratio. The device integrates brown-out reset, watchdog timer, and power-on reset hardware to simplify system bring-up. Typical applications include industrial control logic, appliance controllers, automotive body electronics subsystems, low-end sensor-conditioning front-ends, embedded consumer devices, and educational development platforms where deterministic 8-bit processing is sufficient. The wide -40C to +125C operating range also makes it appropriate for outdoor and automotive under-hood modules when paired with adequate thermal management. When designing with this part, ensure the OTP memory budget aligns with code size expectations - because OTP cannot be erased, firmware bugs discovered late in production cannot be patched at the IC level and must be addressed via board-level rework or a mask-ROM spin. Always validate the 4 MHz instruction-rate ceiling against interrupt service routine latency budgets in time-critical control loops. This page synthesizes distributor availability, parametric drop-in alternatives in the TQFP-44 footprint, and practical design considerations that go beyond the manufacturer datasheet - giving engineers a single reference for procurement, replacement, and implementation decisions.

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PIC16C662-04I/P

PIC16C662-04I/P - 8-Bit 4MHz OTP MCU 7KB Flash 33 I/O | Microchip

The Microchip Technology PIC16C662-04I/P is a member of the legacy PIC16C6x family of 8-bit CMOS microcontrollers, featuring an internal 4 MHz oscillator rating, 7 KB (4K x 14) of one-time-programmable (OTP) program memory, 176 bytes of RAM, and 33 digital I/O lines in a 40-pin PDIP through-hole package. As an OTP ROM device, the program memory can be written once using a device programmer and retains data without power, making this MCU suitable for production-volume embedded designs where firmware is finalized. An 8-bit microcontroller (MCU) is a small computer-on-a-chip integrating a CPU, RAM, non-volatile program memory (ROM/Flash/OTP), and peripherals on a single die. PIC16C66x family parts use a RISC-based Harvard architecture with 35 single-cycle instructions (200 ns instruction cycle at 20 MHz), simplifying code development while delivering deterministic real-time response. Compared with other 8-bit architectures such as the 8051 or AVR, the PIC16C family emphasizes low part cost, small code size (14-bit instruction word), and a broad peripheral set. Key features of the PIC16C662 include 33 bidirectional I/O pins, multiple timers (Timer0, Timer1, Timer2), a 5-channel 8-bit analog-to-digital converter, two analog comparators, a USART/SCI serial port, and an 8-bit parallel slave port. The '04' speed grade indicates a 4 MHz maximum oscillator input, while the 'I' suffix denotes the industrial temperature grade of -40 °C to +85 °C, allowing deployment in non-automotive industrial enclosures. Architecturally, the PIC16C662 uses a 14-bit instruction word with separate program and data buses (Harvard architecture), allowing simultaneous instruction fetch and data access. The OTP program memory uses EPROM cells programmed by a high-voltage pulse from a device programmer, with EPROM windowed parts available for prototype code iteration. Operating from a single 4.5 V to 5.5 V supply, the part draws approximately 2 mA active at 4 MHz and less than 1 µA in sleep mode. Typical applications include industrial control panels, appliance control boards, sensor signal conditioning, LED driving systems, automotive body controllers (industrial grade), HVAC control, and small consumer appliances. The 40-pin PDIP form factor supports breadboard prototyping and hand-soldered production runs. When designing with the PIC16C662-04I/P, note that OTP memory cannot be erased, so use the JW windowed variant for prototype development. The 4 MHz speed grade is suitable for control loops and serial communication up to ~76.8 kbps at 8 MHz oscillator. This page synthesizes distributor pricing, drop-in PIC16C6x alternatives, and practical design notes not found on the Microchip datasheet alone, giving engineers a single reference for sourcing and design decisions.

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PIC16C662-10/L

PIC16C662-10/L - 8-Bit OTP MCU, 7KB, 33 I/O, 10MHz | Microchip

The Microchip Technology PIC16C662-10/L is an 8-bit CMOS OTP microcontroller from the PIC16C6x family, featuring a 10MHz core, 7KB (4K x 14) of one-time-programmable program memory and 176 bytes of RAM, housed in a 44-pin PLCC (J-Lead) package. It is a member of the Mid-Range PIC16 family using an enhanced RISC architecture with 35 instructions and a 14-bit instruction word optimized for embedded control. An OTP (One-Time Programmable) microcontroller is a single-chip computer whose program memory can be written only once after manufacture, typically by the end user, using a device programmer. OTP sits between mask-ROM (lowest unit cost, factory-programmed only) and Flash (re-programmable in-circuit). It is widely used in mature, high-volume consumer and industrial products where code stability is proven and re-programmability is not required, delivering a per-unit cost advantage over Flash parts. The PIC16C6x family belongs to the broader PICmicro 8-bit RISC microcontroller hierarchy, itself a subsystem of Microchip's 8-bit MCU portfolio that bridges the classic PIC16 baseline and the modern PIC18 enhanced family. Key features of the PIC16C662-10/L include a 10MHz maximum operating frequency, 33 digital I/O pins, an 8-bit A/D converter, a USART serial port, three timers, and a watchdog timer. It supports a wide 2.5V-6.0V operating voltage range, industrial -40C to +85C temperature grade, and up to 5 MIPS throughput. The PLCC-44 (J-Lead, 16.59 x 16.59 mm) surface-mount package provides easy prototyping through a standard 44-pin PLCC socket. Architecturally, the device uses a Harvard bus with separate program and data paths, allowing instruction fetch and operand access in a single cycle for most instructions. Peripheral highlights include a capture/compare/PWM module, parallel slave port, and low-power SLEEP mode with wake-up on I/O change, suiting it to industrial controllers, white-goods, and legacy embedded designs. Typical applications include appliance control boards, industrial sensor interfaces, motor-control front-ends, and automotive interior modules. The 33 I/O and built-in USART are particularly useful for connecting keypads, LED displays, and simple RS-232/RS-485 links. The OTP memory makes the part well-suited to mature production where firmware is finalized. When designing with the PIC16C662-10/L, plan firmware development around a one-time burn: budget for volume programming through a gang programmer, and stock finished units for any code change. Use decoupling capacitors within 5 mm of VDD/VSS pins and keep oscillator traces short to avoid EMI on the 10MHz clock line. This page synthesizes distributor pricing, same-family and cross-brand drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C662-10/P

PIC16C662-10/P - 8-bit OTP MCU, 7KB ROM, 33 I/O | Microchip

The Microchip Technology PIC16C662-10/P is an 8-bit CMOS OTP-based microcontroller in the PIC16C6x family, delivering 200 ns instruction execution through a 35-instruction RISC core. Housed in a 40-pin PDIP (DIP-40) through-hole package, the device integrates 7 KB of OTP program memory, 176 bytes of RAM, and 33 digital I/O lines, with a maximum clock speed of 10 MHz (the "-10" speed grade, equivalent to 20 MHz clock input / 200 ns instruction cycle). What is a PIC16C6x microcontroller? An 8-bit microcontroller (MCU) is a single-chip computer containing a CPU, program memory, RAM, and peripherals. The PIC16C6x family belongs to the broader category of microcontrollers -> 8-bit MCUs -> CMOS RISC microcontrollers -> PIC microcontrollers -> embedded controllers -> semiconductors. OTP (One-Time Programmable) memory allows the firmware to be burned once during production, making these parts economical for mature, stable, high-volume products where reprogramming is not required. Key features include 33 I/O pins, an integrated analog comparator, programmable code protection, a programmable watchdog timer, power-saving sleep mode, and wide operating voltage support of 4.5V to 5.5V. The commercial operating temperature range suits industrial and consumer applications, and the OTP-based architecture reduces unit cost compared to flash-based PIC16F equivalents. Technically, the PIC16C662-10/P uses a Harvard architecture with separate program and data buses, enabling single-cycle instruction execution except for program branches, which take two cycles. The device includes two 8-bit timers and one 16-bit timer/counter, a synchronous serial port (SSP) supporting SPI and I2C, and a USART for asynchronous serial communication, providing the connectivity needed for embedded peripheral interfacing. Typical applications include industrial control, automotive subsystems, consumer appliances, security and access control panels, and remote sensor data acquisition nodes. The combination of OTP memory, ample I/O count, and integrated analog comparators makes the device well suited to appliance controllers, HVAC thermostat modules, and small motor drive interface boards. When designing with this part, note that OTP memory requires firmware programming during PCB assembly, so the firmware revision must be locked before volume production. Engineers migrating to a flash-based PIC16F equivalent can reuse the same DIP-40 footprint and pinout but must validate peripheral compatibility and erase/write behavior. This page synthesizes distributor stock, drop-in alternatives, application guidance, and design considerations not found in the manufacturer datasheet alone.

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PIC16C662-10/PT

PIC16C662-10/PT - 8-Bit OTP MCU, 7KB EPROM, 33 I/O | Microchip

The Microchip Technology PIC16C662-10/PT is a one-time-programmable (OTP) 8-bit CMOS microcontroller based on Microchip's PIC architecture, featuring 7KB of EPROM program memory, 176 bytes of RAM, and 33 digital I/O lines, all packaged in a 44-pin TQFP (PT) surface-mount form factor. The device executes instructions in a single 200 ns cycle when clocked at 20 MHz, supports an operating voltage range of 3.0 V to 5.5 V, and integrates two analog comparators with programmable on-chip reference, a 12-bit instruction word, and 35 single-word instructions. Background context: An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, digital I/O peripherals and often analog blocks on one die. Within the broader taxonomy, PIC16C662 belongs to the PIC16 family, which itself sits inside the 8-bit MCU category, the Microcontroller sub-family of Integrated Circuits (ICs). OTP EPROM memory denotes a programmable read-only cell technology that can be written once with a high-voltage programmer but cannot be electrically erased, making it well suited to high-volume production where firmware is finalized. Key differentiating specifications include the 200 ns instruction cycle, 8-level hardware stack, 14-bit wide instruction word, integrated analog comparators with programmable voltage reference, Power-on Reset (POR), Brown-out Reset (BOR), Watchdog Timer (WDT) with its own on-chip RC oscillator, and In-Circuit Serial Programming (ICSP) capability. The 44-pin TQFP package exposes up to 33 I/O pins and provides 5 MIPS sustained throughput at 20 MHz clock, giving designers a compact footprint for cost-sensitive embedded designs. The PIC16C662 employs a RISC-style Harvard architecture with separate program and data buses, allowing instruction fetch and operand access to occur in the same cycle. The internal oscillator and PLL-free design simplify BOM cost, while the dual analog comparators eliminate the need for external op-amps in signal-conditioning tasks such as battery monitoring or threshold detection. Typical applications include appliance control, automotive body electronics, industrial sensor interfaces, smart card readers, battery chargers, LED lighting controllers, and embedded control boards. The integrated analog comparators make it well suited to threshold detection without external components. When designing with this device, note that OTP memory cannot be field-updated; use the PIC16F flash-based equivalent (e.g., PIC16F914-I/PT) if firmware iteration is expected in production. ICSP programming still requires a high-voltage (typically 13 V) VPP pulse, so plan board layout to expose PGC, PGD and VPP test points. This page synthesizes distributor pricing, package-compatible drop-in alternatives sourced from Microchip's own cross-reference tooling, and practical design notes not found in the standalone datasheet.

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PIC16C662-10E/L

PIC16C662-10E/L - 8-bit OTP MCU, 7KB EPROM, 44-PLCC | Microchip

The Microchip Technology PIC16C662-10E/L is a high-performance, CMOS OTP-based 8-bit microcontroller built on Microchip's proven PIC architecture, integrating 7 KB of EPROM program memory (4K x 14), a 10 MHz operating frequency with 200 ns instruction cycle, and a rich peripheral set including analog comparators, into a 44-pin PLCC (J-lead) package designated "L". The "-10E" speed/temperature grade specifies 10 MHz operation across the -40C to +125C extended automotive temperature range, making it qualified for under-hood and harsh-environment automotive applications. The "C" suffix denotes the EPROM windowless OTP (One-Time-Programmable) variant optimized for volume production. A PIC (Peripheral Interface Controller) microcontroller is a RISC-based embedded processor that combines a CPU core, program memory, RAM, and peripherals on a single CMOS die. Within the broader taxonomy, PIC MCUs sit under 8-bit microcontrollers -> microcontrollers -> microcontrollers/MCU -> embedded processors -> semiconductors. The PIC16C family, originally introduced in the early 1990s, established the baseline for modern PIC instruction sets with only 35 single-word instructions, an 8-level hardware stack, and a Harvard bus architecture that separates program and data paths for deterministic single-cycle execution. Key features of the PIC16C662-10E/L include: 7 KB EPROM program memory, 192 bytes of general-purpose RAM, up to 33 digital I/O pins, multiple 8-bit and 16-bit timer/counter modules, dual analog comparators with programmable reference, a synchronous serial port (SSP) supporting SPI and I2C master/slave, configurable watchdog timer with on-chip RC oscillator, and brown-out reset protection. The device operates from 2.5 V to 6.0 V across commercial, industrial, and automotive temperature grades, providing flexibility for battery-powered and 5 V logic designs. The PIC16C662-10E/L uses a RISC CPU with two-stage pipeline architecture, executing each instruction in a single 200 ns cycle at 10 MHz oscillator. Its 14-bit-wide instruction word, separate 8-bit data bus, and 8-level deep hardware stack provide deterministic interrupt latency critical for real-time control. The integrated dual analog comparators enable closed-loop feedback systems such as power supply regulation, sensor threshold detection, and motor current monitoring without external analog components. Typical applications span automotive body and chassis ECUs (climate control, instrument clusters, lighting modules), industrial process control (programmable logic controllers, motor drives), consumer appliances (washing machines, microwave ovens), and white-goods user-interface boards. The extended temperature grade and OTP memory make the device well suited for high-volume production runs where firmware is finalized at the time of manufacture. When designing with this part, ensure that OTP programming is performed with a Microchip-compatible device programmer before the device is sealed. For in-circuit reprogramming or field firmware updates, consider the Flash-based PIC16F series equivalents (e.g., PIC16F877) which retain pin-to-pin compatibility in many cases. This page synthesizes distributor stock data, pin-compatible drop-in alternatives, and practical automotive/industrial design notes that are not consolidated in any single manufacturer datasheet.

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PIC16C662-10E/PQ

PIC16C662-10E/PQ - 8-bit OTP MCU, 7KB, 33 I/O, 44-MQFP | Microchip

The Microchip Technology PIC16C662-10E/PQ is an 8-bit OTP (One-Time Programmable) CMOS microcontroller in the PIC16CXX family, delivering 7KB of program memory and 176 bytes of RAM with 33 digital I/O pins, housed in a 44-pin Metric Quad Flat Pack (MQFP, 10x10 mm) package. It operates at a maximum clock speed of 10 MHz across a 4.0 V to 6.0 V supply range and is rated for the -40C to +125C extended industrial temperature window, as indicated by the -10E designator in the part number. What is an OTP microcontroller? An OTP microcontroller is a variant of flash-based MCUs that uses a one-time-programmable memory cell array. The on-chip program memory can be written exactly once using a device programmer, after which the bit cells become read-only. OTP parts lower die cost and are used in mature, high-volume, cost-sensitive products where code revision is unnecessary, such as appliance controls, automotive sub-modules, and consumer white goods. Key features include 7KB EPROM program memory, 176 bytes of data RAM, a 14-bit instruction word, hardware USART with SPI and I2C master/slave modes, an 8-bit A/D converter with up to 8 channels, three timers (Timer0/Timer1/Timer2), a watchdog timer with on-chip RC oscillator, and a programmable code-protection scheme. The 33 I/O pins can source/sink up to 25 mA per pin, suitable for direct LED and relay drive in many applications. Architecturally, the PIC16C662 belongs to the mid-range PIC16 family and uses a 14-bit RISC instruction set with single-cycle execution except for branch instructions. The device integrates a high-endurance EPROM cell that retains code for more than 10 years, and the on-chip brown-out reset and power-on reset blocks simplify external reset hardware. The MQFP-44 package supplies ample ground and power pins to keep digital switching noise isolated from sensitive analog blocks. Typical applications include industrial control panels, automotive body and chassis modules, HVAC thermostat controls, security and alarm panels, and appliance motor controllers. The wide 4.0-6.0 V supply tolerance accommodates unregulated 5 V rails that are common in industrial and automotive environments. When designing with this device, ensure your programmer supports OTP-mode programming and that code is fully validated before final programming, because the memory cannot be erased afterward. Decouple VDD with at least 0.1 uF ceramic and 10 uF tantalum close to the supply pins, and reserve MCLR as a reset input if in-circuit programming is required. This page synthesizes current distributor stock and pricing, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C662-10E/PT

PIC16C662-10E/PT - 8-Bit 10MHz 7KB OTP MCU 44-TQFP | Microchip

The Microchip Technology PIC16C662-10E/PT is a member of the PIC16C6x family of 8-bit CMOS microcontrollers with EPROM/OTP program memory, packaged in a 44-pin TQFP (10x10 mm). The "-10" speed grade denotes a 10 MHz maximum clock frequency and the "E" suffix indicates the Extended industrial temperature range (-40C to +125C), making this part suitable for harsh-environment embedded designs. The device integrates 7KB of OTP program memory (organized as 4K x 14) and approximately 176 bytes of general-purpose RAM. An OTP (One-Time Programmable) microcontroller is a class of non-volatile programmable logic device that can be written only once after manufacture - a cost-optimized solution for high-volume, mature products where field firmware updates are not required. Within the broader taxonomy, OTP MCUs sit between mask-ROM devices (lowest cost, fixed code) and Flash-based MCUs (re-programmable); they share the same PIC16C core architecture, instruction set, and peripheral set as their Flash equivalents. PIC16C6x parts are widely used in industrial control, appliance, and automotive subsystems where production firmware is frozen. Key features of the PIC16C662-10E/PT include 33 digital I/O pins, an integrated analog comparator, a watchdog timer, a 8-bit timer/counter (Timer0) and an 8-bit timer/counter with prescaler (Timer1), plus capture/compare/PWM modules. The device also supports an external oscillator, low-power SLEEP mode, and in-circuit serial programming (ICSP) via the ICSP pins. Operating voltage ranges from 3.0 V to 6.0 V (per the PIC16C66x datasheet family). Typical applications include industrial control panels, white-goods motor control, security keypads, HVAC controllers, and automotive body-electronics modules. The extended temperature range and EPROM-based memory make this part a robust choice for long-lifecycle, fixed-code designs. Engineers designing with this device should review the PIC16C66x datasheet family for oscillator configuration, current consumption per MHz, and the I/O pin mapping for the 44-TQFP package.

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PIC16C662-10I/L

PIC16C662-10I/L - 7KB OTP 8-bit MCU 10MHz 44-PLCC | Microchip

The Microchip Technology PIC16C662-10I/L is an 8-bit OTP (One-Time Programmable) CMOS microcontroller from the PIC16C family, delivering 7 KB of program memory (4K x 14), 176 bytes of RAM, and 33 I/O pins in a 44-lead PLCC (J-Lead) package operating at up to 10 MHz from a 5 V supply. What is a PIC16C microcontroller? The PIC16C is Microchip's classic mid-range OTP (One-Time Programmable) 8-bit microcontroller family, sitting between the baseline PIC10/12/16 and the flash-based PIC18 families. PIC16C devices are widely used in cost-sensitive industrial controls, appliance, automotive body electronics and legacy designs that ship in high volume where mask-ROM/OTP economics outweigh flash reprogrammability. Within that hierarchy, PIC16C662 belongs to the PIC16C6x subgroup with integrated peripherals and the larger memory options (7 KB ROM/OTP) of the family. Key features include 13 interrupt sources, a Harvard RISC architecture with 14-bit instructions and 35 single-cycle instructions, a watchdog timer with on-chip RC oscillator, two 8-bit timers and one 16-bit timer/counter, an 8-bit parallel slave port, a USART with enhanced addressing, and an 8-channel 8-bit ADC. Operating current is approximately 2 mA at 5 V and 10 MHz. The 44-pin PLCC package supports commercial, industrial and (where qualified) extended temperature grades, with the -10I/L suffix denoting 10 MHz operation in the industrial temperature range (-40C to +85C). Architecturally, PIC16C662 uses a 14-bit wide instruction word, separate code and data buses (Harvard), and an 8-level deep hardware stack. The OTP program memory is one-time writable by the user, requiring a UV-windowed JW package or a gang programmer for development; production programming is done in-circuit or by socket. Typical applications include industrial control and sensor front-ends, appliance control boards, HVAC and pump controllers, automotive body and interior modules, security and fire-alarm panels, and white-goods user interfaces. The 33 I/O and the 8-channel ADC make it especially useful for mixed-signal subsystems with several analog inputs and digital I/O expansion. When designing with PIC16C662, mind that OTP precludes in-field firmware updates; if you anticipate firmware revisions, budget for a flash-based PIC16F or PIC18 replacement now, or use a JW windowed device only for development. Industrial temperature operation also requires verification of the exact operating range and decoupling per the manufacturer datasheet typical application circuit. This page consolidates distributor pricing, drop-in PIC16C662 alternative MPNs sharing the same 44-pin PLCC package, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C662-10I/P

PIC16C662-10I/P - 8-bit OTP MCU, 7KB ROM, 176B RAM, 33 I/O | Microchip

The Microchip Technology PIC16C662-10I/P is a 200 ns instruction-execution, 35 single-word instruction CMOS OTP-based 8-bit microcontroller that packs Microchip's PIC architecture into a 40-pin PDIP package. It integrates 7 KB of OTP program memory, 176 bytes of data RAM, 33 digital I/O lines, and operates at up to 10 MHz from a single 5 V supply. The 'I' suffix denotes an industrial temperature grade of -40C to +85C, and the 'P' suffix indicates a through-hole PDIP-40 package. An 8-bit microcontroller (MCU) is a programmable embedded processor that executes one byte (8 bits) of data per instruction cycle, integrating CPU core, RAM, ROM/Flash, timers, communication peripherals, and I/O into a single IC. Within the embedded systems hierarchy it sits below 32-bit MCUs in complexity but above fixed-function logic ICs in flexibility. PIC microcontrollers use a RISC-style Harvard architecture with separate program and data buses, making instruction fetch and data access fully parallel, which delivers deterministic throughput and excellent code density for control applications. Key features include 7 KB (4K x 14) one-time-programmable program memory for firmware storage, 176 bytes of general-purpose SRAM, 33 bidirectional digital I/O pins arranged across multiple ports, an 8-bit timer/counter with prescaler, watchdog timer, power-on reset, brown-out detect, and low-power SLEEP/idle modes. The 40-pin PDIP footprint gives breadboard-friendly through-hole mounting for prototyping and industrial designs. The PIC16C662-10I/P uses Microchip's enhanced mid-range core (14-bit instruction word) with hardware stack and interrupt controller supporting both edge- and level-triggered external interrupts. The 10 MHz oscillator at 5 V yields a 200 ns instruction cycle (Fosc/4), enough for routine control loops, keypad scanning, LCD driving, and UART bit-banging. Typical applications include industrial control panels, HVAC zone controllers, security alarm panels, keypad / LCD user interfaces, motor-driver front ends, low-end appliance controllers, and legacy embedded systems where OTP-based microcontrollers are still preferred for cost or firmware-stability reasons. Its 33 I/O count is well-suited to scanning 4x4 or 5x5 matrix keypads and 4-digit seven-segment displays. When designing with this part, note that OTP memory cannot be rewritten in-circuit - production programming must be done before or during board assembly. Reserve a single ICSP header (RB6/RB7 pins) for factory programming; consider migrating to the flash-based PIC16F87x family if in-field firmware updates are required. Decouple VDD/VSS close to the pins with a 100 nF ceramic plus a 10 uF bulk cap, and use a series resistor on MCLR if in-circuit programming is also needed in production test. This page synthesizes distributor availability, exact 40-pin PDIP drop-in alternatives, and practical OTP vs Flash migration design notes that are not found on the bare manufacturer datasheet, helping engineers evaluate the PIC16C662-10I/P for both new designs and legacy maintenance.

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PIC16C662-10I/PT

PIC16C662-10I/PT - 8-bit OTP MCU, 7KB, 33 I/O, 10MHz | Microchip

The Microchip Technology PIC16C662-10I/PT is an 8-bit CMOS OTP microcontroller built on the PIC16C6x core architecture, featuring 7KB of one-time-programmable program memory, 176 bytes of RAM, and 33 digital I/O pins, housed in a 44-pin TQFP (PT) package with a maximum clock frequency of 10 MHz. A PIC microcontroller is a compact, self-contained computer-on-a-chip combining an 8/16/32-bit CPU core, program memory (ROM/OTP/Flash), data RAM, non-volatile EEPROM, and a rich set of peripherals (timers, ADC, UART, I/O ports) on a single silicon die. Within the semiconductor taxonomy, PIC microcontrollers sit under the broader hierarchy: microcontroller -> embedded processor -> integrated circuit -> semiconductor device. The PIC16C family is the original mid-range OTP/EPROM lineage from Microchip, widely deployed in legacy industrial, appliance, and automotive-electronics designs where rugged, deterministic behavior matters more than flash re-programmability. Key features of the PIC16C662-10I/PT include its 33 I/O pins (one of the highest pin counts in the 44-pin PIC16C6x family), integrated analog comparator, three timer modules, and 8-bit parallel slave port. The device runs from a wide 3.0V to 6.0V supply and supports 10 MHz operation across the industrial -40C to +85C temperature range, as indicated by the "I" suffix. The TQFP-44 (PT) package offers surface-mount manufacturability with a standard 10x10 mm body. The PIC16C662-10I/PT uses a RISC-style 14-bit instruction set with single-cycle execution (except branches), giving deterministic throughput that simplifies real-time control loops. The device does not include in-system programming; OTP memory is programmed via device programmers such as the MPLAB PM3. Power consumption is low (typical operating current under 20 mA at full clock) thanks to CMOS design and the PIC's sleep-mode architecture. Typical applications include human-machine interface controllers, motor control front-ends, security and alarm panels, and consumer appliance mainboards. The wide I/O count also suits LED display drivers, keypad scanners, and sensor-hub controllers where multiple digital lines must be serviced without external glue logic. When designing with this part, plan OTP programming into the production flow (windowed UV-erase variants are available for prototyping but the -10I/PT suffix denotes industrial-temperature OTP only). Decoupling capacitors (0.1 uF plus 10 uF bulk) should be placed within 5 mm of VDD/AVDD and VSS pins. For designs that may migrate to flash memory later, consider the PIC16F662 family, which is pin-compatible. This page synthesizes real distributor pricing, package-level drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet - helping engineers evaluate the PIC16C662-10I/PT for both legacy sustainment and new product design decisions.

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PIC16C662-20/PQ

PIC16C662-20/PQ - 8-bit OTP MCU, 7KB, 33 I/O, 20MHz | Microchip

The Microchip Technology PIC16C662-20/PQ is an 8-bit CMOS microcontroller based on the PIC16C6x core, featuring 7KB of one-time-programmable (OTP) program memory, 176 bytes of RAM, 33 digital I/O lines, and a maximum clock speed of 20 MHz, all housed in a 44-pin MQFP (PQ) package. It belongs to the PIC16C6x mid-range family and integrates a 10-bit Analog-to-Digital Converter, a USART module, a 16-bit Capture/Compare/PWM (CCP) peripheral, and a watchdog timer with its own on-chip RC oscillator. A microcontroller (MCU) is a single-chip computer that contains a processor core, program memory, working RAM, and peripheral interfaces. Within the broader taxonomy, the PIC16C662 belongs to the 8-bit MCU category, which sits beneath the umbrella of microcontrollers, embedded processors, and ultimately semiconductor ICs. 8-bit MCUs remain dominant in cost-sensitive, deterministic control applications where their simple Harvard architecture and predictable instruction timing are advantageous over 32-bit Cortex-M alternatives. Key features include 7KB of OTP program memory for field-programmable but non-rewritable code storage, 33 general-purpose I/O pins with individual direction control, a 20 MHz oscillator input that yields a 5 MHz instruction cycle (one instruction per four oscillator cycles), and a brown-out reset circuit. The integrated 10-bit ADC provides up to 8 analog input channels for direct sensor interfacing without external converters. The PIC16C662 uses Microchip's mid-range RISC architecture with 35 single-word instructions and a 14-bit instruction word. Its OTP program memory makes it well suited to mature, high-volume production where firmware changes are no longer anticipated, whereas flash-based PIC16F6x family members are typically preferred during development and low-volume runs. The PQ suffix designates the 44-pin Metric Quad Flat Pack (MQFP) package, which supports surface-mount assembly. Typical applications include industrial control panels, appliance controllers, automotive body electronics, uninterruptible power supplies, and embedded sensor hubs. The 33 I/O count, integrated USART, and CCP peripheral make it a strong fit for closed-loop motor control, switch-mode power supply secondary-side control, and HVAC damper/valve actuation. When designing with the PIC16C662-20/PQ, note that OTP memory cannot be reprogrammed - all firmware must be fully validated before device programming. Decoupling capacitors of 100 nF should be placed adjacent to each VDD/VSS pair, and unused I/O pins should be configured as outputs to minimize quiescent current. This page synthesizes distributor stock data, drop-in same-family alternatives, and practical design notes not consolidated in the manufacturer datasheet.

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PIC16C662-20/PT

PIC16C662-20/PT - 8-Bit OTP MCU 7KB 20MHz TQFP-44 | Microchip

The Microchip PIC16C662-20/PT is an 8-bit CMOS OTP-based microcontroller featuring 7KB of program memory (4K x 14 organization), 176 bytes of RAM, and a 20 MHz maximum clock speed, packaged in a 44-pin TQFP (PT) form factor with industrial operating temperature grade. The '20' suffix denotes the 20 MHz speed grade, while the 'C' family designation marks the One-Time-Programmable (OTP) EPROM variant of the PIC16C6xx mid-range architecture. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, ROM/Flash, and peripherals on one die, optimized for embedded control tasks. The PIC16C662 belongs to Microchip's mid-range PIC16 family, which sits between the baseline PIC10/12/16 devices and the high-performance PIC18/dsPIC families. Within the system hierarchy, this device is classified as a microcontroller -> embedded controller -> semiconductor IC. OTP memory means the program can be written once (unlike Flash which is rewritable), which makes the part suitable for low-volume production, prototyping, and legacy systems already in field service. Key features of the PIC16C662-20/PT include five 8-bit I/O ports, three timer/counters, a Watchdog Timer with its own on-chip RC oscillator, a 5-channel 8-bit Analog-to-Digital Converter (ADC), and two analog comparators. The device operates from 4V to 6V (typical 5V), supports in-circuit serial programming via two pins, and provides power-saving SLEEP mode. The brown-out reset and power-on reset circuits are integrated, eliminating external reset components in many designs. The PIC16C662 architecture uses a Harvard-style RISC core with a 14-bit instruction word, a single accumulator (W register), and an instruction pipeline that delivers most instructions in one cycle, giving approximately 5 MIPS throughput at 20 MHz. The 35 single-word instructions and 8-level deep hardware stack make the core deterministic and simple to program in assembly or C, which is why PIC16C-series MCUs remain embedded in industrial controllers, appliance controls, and legacy instrumentation. Typical applications include industrial control panels, HVAC thermostats and fan controllers, security alarm keypads, automotive dashboard sub-modules, vending machine controllers, and legacy LCD/LED display controllers. The 44-pin TQFP footprint provides sufficient I/O for keypad scanning, sensor conditioning through the ADC, and PWM-driven motor or buzzer control. When designing with this device, ensure the OTP programming window (verified by Microchip programming specifications) is used during code development. Pin 1 orientation on the TQFP must be observed per the package marking, and decoupling capacitors of 0.1 µF plus 10 µF tantalum should be placed close to VDD/VSS pairs to suppress switching noise on the analog ADC channels.

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PIC16C662-20E/L

PIC16C662-20E/L - 8-Bit OTP MCU, 7KB, 20MHz, 44-PLCC | Microchip

The Microchip Technology PIC16C662-20E/L is an 8-bit RISC microcontroller in the PIC16C family, offering 7KB of one-time-programmable (OTP) program memory and 176 bytes of RAM, housed in a 44-pin PLCC (J-Lead) package. The "-20E" speed/temperature grade indicates a 20 MHz maximum clock and an extended industrial temperature range. As a member of the PIC16C6xx mid-range family, it is built around Microchip's enhanced Harvard architecture and is targeted at embedded control applications requiring moderate code density and a generous I/O count. A PIC microcontroller (Peripheral Interface Controller) is a class of 8-bit RISC microcontrollers originally developed by General Instrument's Microelectronics Division and later popularized by Microchip Technology. PIC MCUs sit in the hierarchy: microcontroller -> embedded processor -> semiconductor device. They are widely deployed because of their deterministic instruction set, low power consumption, and a peripheral-rich core that integrates timers, capture/compare/PWM, USART, and A/D converters in a single die. The PIC16C family is the original OTP (windowed/EPROM-based) line, predating the flash-based PIC16F family; today, PIC16C devices are typically selected for legacy designs, automotive modules, and harsh-environment applications where OTP memory provides radiation and code-security benefits. Key features of the PIC16C662-20E/L include 33 digital I/O pins, an integrated 8-channel 8-bit A/D converter, two 8-bit timers plus one 16-bit timer, a USART port, and a watchdog timer. The 20 MHz clock delivers 200 ns instruction cycle (5 MHz instruction rate) and approximately 5 MIPS sustained throughput, sufficient for closed-loop control, simple protocol stacks, and human-machine-interface logic. The 44-pin J-lead PLCC package supports through-hole and socketed designs, simplifying prototype rework and field replacement. Typical applications include industrial sensor conditioning, automotive body controllers, appliance controls, HVAC damper drivers, and simple keypad/display subsystems. The 33 I/O pins comfortably service keypad scanning, LED multiplexing, and direct sensor/actuator wiring without external glue logic. The 8-bit A/D handles slow analog inputs such as thermistors, pressure transducers, and battery monitors. The USART enables RS-232/485 communication with a host controller or peer device. When designing with this MCU, allocate OTP programming time into the production schedule - OTP devices cannot be reprogrammed in-circuit. For prototyping, migrate to the PIC16F662 (flash) drop-in; for production runs of proven firmware, the PIC16C662-20E/L is the lower-cost, higher-reliability choice. Decoupling: 0.1 µF ceramic on VDD/VSS pairs and a 10 µF bulk capacitor on the main rail. This page synthesizes distributor pricing, drop-in OTP/flash alternatives, and practical design notes for the PIC16C662-20E/L not found in the manufacturer datasheet.

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PIC16C662-20E/P

PIC16C662-20E/P - 8-bit OTP MCU, 20 MHz, 33 I/O | Microchip

The Microchip Technology PIC16C662-20E/P is an 8-bit CMOS OTP-based microcontroller with a 20 MHz maximum clock input (200 ns instruction cycle), 7 KB of one-time programmable program memory, 176 bytes of RAM, and 33 digital I/O lines, housed in a 40-pin PDIP (DIP-40) through-hole package. It operates from a single 4.5 V to 5.5 V supply and is qualified to the AUTOMOTIVE temperature grade, targeting harsh-environment and automotive designs. The /P suffix denotes the plastic DIP package, and the -20E speed/operating-range designator selects the 20 MHz clock at the extended temperature grade. An 8-bit OTP microcontroller is a member of the microcontrollers (MCU) family — a single-chip computer integrating a CPU core, non-volatile program memory (here, one-time programmable EPROM), working RAM, and programmable peripheral I/O on one die. Within the broader taxonomy, the PIC16C662 belongs to: 8-bit MCU -> RISC microcontroller -> CMOS microcontroller -> embedded controller -> semiconductor IC. OTP memory allows a single factory- or customer-programmable code image that cannot be electrically rewritten, which is typically used for low- to medium-volume production where firmware stability has been finalized. Key features include the original PIC16Cxx Harvard RISC architecture with only 35 single-word instructions to learn, 14-bit instruction word, an 8-level deep hardware stack, an integrated analog comparator module, and interrupt-driven I/O with edge-selectable interrupts on PORTB. The device supports a watchdog timer with on-chip RC oscillator, power-saving Sleep mode, and a programmable code-protection bit. Technical depth comes from its CMOS OTP process combined with the Harvard bus that lets instruction and data fetches occur simultaneously, achieving most instructions in a single 200 ns cycle and program branches in two cycles (400 ns). Compared with contemporary EPROM-based MCUs of the same era, the 14-bit wide instruction word provides more opcode room than 8-bit CISC cores and improves code density for arithmetic and bit-manipulation workloads. Typical applications include automotive body and chassis subsystems, white-goods appliance control, industrial sensor interfaces, and low-cost user-interface panels that benefit from a 33-I/O budget and a wide automotive operating temperature range. The DIP-40 footprint is favored for prototype breadboarding and rework-friendly production runs. When designing with this OTP MCU, plan your code carefully because OTP cannot be rewritten after programming; only one code-programming pass is possible. Verify that the application's peripheral set (analog comparator + PORTB interrupts + timer/counter) is sufficient, because the PIC16C662 does not include the ADC, PWM, or USART peripherals found on later PIC16F-series parts. This page synthesizes distributor pricing and stock data, drop-in same-brand alternatives, and engineering design notes that complement the Microchip datasheet and the PICmicro Pin and Code Compatibility charts.

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PIC16C66-20E/SO - 8-Bit 20MHz OTP MCU 14KB | Microchip

PIC16C66-20E/SP - 8-Bit 20MHz OTP MCU 14KB | Microchip

PIC16C66-20I/SO - 8-Bit 20MHz OTP MCU 14KB | Microchip

PIC16C66-20I/SP - 8-Bit 20MHz OTP MCU, 14KB, 28-SPDIP | Microchip

PIC16C66/JW - 8-Bit 20MHz 14KB EPROM MCU | Microchip | 28-CDIP

PIC16C662-04/P - 8-Bit CMOS OTP MCU, 7KB, 33 I/O | Microchip

PIC16C662-04/PQ - 8-bit OTP MCU, 7KB, 33 I/O | Microchip | MQFP-44

PIC16C662-04E/L - 4MHz 8-bit OTP MCU, 7KB, 44-PLCC | Microchip

PIC16C662-04E/P - 4MHz 8-bit OTP MCU, 7KB | Microchip

PIC16C662-04E/PT - 8-bit OTP MCU 7KB Flash 33 I/O 4MHz | Microchip

PIC16C662-04I/P - 8-Bit 4MHz OTP MCU 7KB Flash 33 I/O | Microchip

PIC16C662-10/L - 8-Bit OTP MCU, 7KB, 33 I/O, 10MHz | Microchip

PIC16C662-10/P - 8-bit OTP MCU, 7KB ROM, 33 I/O | Microchip

PIC16C662-10/PT - 8-Bit OTP MCU, 7KB EPROM, 33 I/O | Microchip

PIC16C662-10E/L - 8-bit OTP MCU, 7KB EPROM, 44-PLCC | Microchip

PIC16C662-10E/PQ - 8-bit OTP MCU, 7KB, 33 I/O, 44-MQFP | Microchip

PIC16C662-10E/PT - 8-Bit 10MHz 7KB OTP MCU 44-TQFP | Microchip

PIC16C662-10I/L - 7KB OTP 8-bit MCU 10MHz 44-PLCC | Microchip

PIC16C662-10I/P - 8-bit OTP MCU, 7KB ROM, 176B RAM, 33 I/O | Microchip

PIC16C662-10I/PT - 8-bit OTP MCU, 7KB, 33 I/O, 10MHz | Microchip

PIC16C662-20/PQ - 8-bit OTP MCU, 7KB, 33 I/O, 20MHz | Microchip

PIC16C662-20/PT - 8-Bit OTP MCU 7KB 20MHz TQFP-44 | Microchip

PIC16C662-20E/L - 8-Bit OTP MCU, 7KB, 20MHz, 44-PLCC | Microchip

PIC16C662-20E/P - 8-bit OTP MCU, 20 MHz, 33 I/O | Microchip