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PIC16C662T-10/PT - 8-bit OTP MCU, 7KB, 44-TQFP | Microchip
PIC16C662T-10/PT

PIC16C662T-10/PT - 8-bit OTP MCU, 7KB, 44-TQFP | Microchip

The Microchip Technology PIC16C662T-10/PT is an 8-bit RISC microcontroller based on the PIC16 architecture, featuring 7KB of One-Time Programmable (OTP) EPROM program memory and housed in a 44-pin TQFP surface-mount package. It operates from a 5V supply, supports a 10 MHz maximum clock frequency in the -10 speed grade, and is supplied on tape and reel for high-volume assembly. An 8-bit microcontroller (MCU) is a small computer-on-a-chip that integrates a CPU, non-volatile program memory, working RAM, digital I/O, and one or more peripherals such as timers, capture/compare, ADC, or communication interfaces into a single IC. PIC16-series MCUs use a Harvard RISC core with a 14-bit instruction word and a fixed program/data bus architecture, positioning them within the broader hierarchy of microcontroller -> embedded controller -> semiconductor device, and historically targeting low-power deterministic real-time control applications. Key features of the PIC16C662T-10/PT include 7 KB of on-chip OTP EPROM, 128 bytes of RAM, multiple timers, capture/compare/PWM peripherals, a 10 MHz maximum operating frequency, and an industrial-relevant operating temperature range. The 44-TQFP package provides 33+ general-purpose I/O pins, suitable for parallel display driving, keypad scanning, and multi-channel sensor interfaces. The OTP memory enables low-cost prototyping with a mature toolchain. From an architecture perspective, the device uses a Harvard RISC core with separate program and data buses, allowing instruction fetch and data access to occur in the same cycle. The 14-bit instruction set is fixed-width for deterministic timing, and integrated brown-out reset, watchdog timer, and power-on reset support robust embedded operation. The OTP memory is one-time programmable in production units and is windowed-erasable in ceramic-DIP variants of the PIC16C662 family. Typical applications include industrial control panels, instrument front panels, low-cost keypad/display interfaces, appliance controllers, and legacy embedded products that were designed around the PIC16C family during the 1990s. Its deterministic core and rich I/O set make it well suited to real-time bit-banging, multi-channel sensor multiplexing, and slow-bus peripheral bridging. When designing with this part, note that OTP memory cannot be re-programmed in-circuit, so firmware validation must be completed on a windowed (JW) or flash-equivalent (PIC16F) variant before committing to OTP. Decoupling must follow Microchip's recommended 100 nF near each VDD/VSS pair, and unused I/O should be left as outputs-low or inputs with weak pull-ups to minimize ICC. This page synthesizes distributor pricing, drop-in same-package alternatives (including flash variants), and practical design notes not found in the bare manufacturer datasheet.

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PIC16C662T-10E/PQ - 8-Bit OTP MCU, 7KB, 33 I/O | Microchip | MQFP-44
PIC16C662T-10E/PQ

PIC16C662T-10E/PQ - 8-Bit OTP MCU, 7KB, 33 I/O | Microchip | MQFP-44

The Microchip Technology PIC16C662T-10E/PQ is an 8-bit RISC CMOS microcontroller built around the PIC16C66x core, offering 7KB of One-Time Programmable (OTPROM) program memory, 176 bytes of data RAM, and 33 digital I/O lines in a 44-pin MQFP (PQ) surface-mount package. The device operates from a 4.0V to 6.0V supply and is rated for a maximum clock frequency of 10 MHz, with the "-10" speed designation confirming 10 MHz operation across the full VDD range. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/EPROM/Flash/OTP), data RAM, I/O peripherals, and timers onto one die. PIC microcontrollers use a Harvard RISC architecture with a small, fixed instruction set optimized for deterministic, single-cycle execution (excluding branches). They sit within the broader category of microcontrollers -> embedded processors -> semiconductors. OTP variants like the PIC16C662 are typically chosen for low-to-medium volume production where the cost of Flash reprogrammability is not justified, but field-programmability during prototyping is still required. Key features of the PIC16C662T-10E/PQ include integrated analog peripherals (two on-chip comparators and an 8-bit ADC reference per the PIC16C66x family), Brown-Out Detect (BOD) and Power-On Reset (POR) for robust supply supervision, a Watchdog Timer (WDT) for runaway code recovery, and a programmable 8-bit prescaler shared between Timer0 and the WDT. The "E" suffix indicates the Extended industrial temperature grade of -40C to +125C, and the "T" denotes Tape and Reel packaging. The 44-pin MQFP package (0.80 mm terminal pitch) exposes up to 33 GPIO pins along with dedicated oscillator, MCLR, VDD/VSS, and analog input pins. Peripheral interfaces are software-controlled through Special Function Registers (SFRs), and code development is supported by the MPASM assembler and the PICmicro Mid-Range C Compiler under MPLAB IDE. The CMOS process gives the part very low power consumption, suiting it to both battery-backed and line-powered appliances. Typical applications include consumer appliance control panels, low-end motor control boards, security alarm keypads, automotive body electronics (non-safety), industrial sensor interfaces, and white-goods user-interface modules. The combination of OTP memory, BOD/POR, and analog comparators lets a single chip replace several discrete components in simple embedded designs. Designers should note that the PIC16C662 OTP cannot be erased or rewritten; firmware must be fully verified before programming. The 4.0V to 6.0V VDD range makes the part incompatible with 3.3V-only systems without a level shifter. Engineers migrating to new designs are encouraged to consider Flash-based PIC16F equivalents for lower total cost of ownership. This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet, helping sourcing engineers and PCB designers evaluate the PIC16C662T-10E/PQ quickly.

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PIC16C662T-10I/L - 8-Bit OTP MCU, 7KB, 10MHz, 44-PLCC | Microchip
PIC16C662T-10I/L

PIC16C662T-10I/L - 8-Bit OTP MCU, 7KB, 10MHz, 44-PLCC | Microchip

The Microchip Technology PIC16C662T-10I/L is an 8-bit RISC microcontroller from the PIC® 16C mid-range family, featuring 7KB (4K x 14) of One-Time-Programmable (OTP) program memory, 10 MHz maximum operating frequency, and a 44-pin PLCC (J-Lead) package rated for the industrial temperature range. As a member of Microchip's classic PIC16C6xx series, it integrates a Harvard-architecture RISC CPU core with 35 single-word instructions, allowing most instructions to execute in a single instruction cycle for efficient embedded control. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, EEPROM/OTP, and peripherals onto one silicon die. The PIC16C6xx family belongs to Microchip's mid-range MCU taxonomy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. It sits between 8-bit baseline PIC10/12/16 cores and the higher-performance 16-bit PIC24/dsPIC families, balancing code density, low cost, and a rich peripheral set for general-purpose control. Key features of the PIC16C662T-10I/L include 7KB OTP program memory (4K x 14-bit words), 192 bytes of data RAM, five 8-bit I/O ports (PORTA-PORTE), a 10-bit Analog-to-Digital Converter (ADC) module, two 8-bit timer/counters (Timer0 and Timer2) plus one 16-bit timer (Timer1), a Universal Synchronous Asynchronous Receiver Transmitter (USART) for serial communication, and a watchdog timer for code-flow recovery. The OTP memory allows one-time field programming, making the part well suited for production runs of stable, mature firmware designs. The device operates from 3.0V to 5.5V and supports an industrial temperature range of -40C to +85C. Its 44-pin PLCC (J-Lead) package provides a robust through-hole-mountable footprint that is easy to socket on legacy and industrial backplanes, and the J-lead geometry supports standard programming sockets and ATE fixtures. The 10 MHz clock source enables instruction execution at up to 5 MIPS, sufficient for closed-loop control and serial-protocol handling. Typical applications include industrial automation controllers, consumer-electronics control boards, sensor-signal conditioning front ends, motor-control auxiliary logic, HVAC control modules, security-panel keypads, and legacy automotive body modules. The combination of OTP memory and a 5V-tolerant I/O structure makes this device a long-life fit for mature product lines that do not require in-system reprogramming. When designing with the PIC16C662T-10I/L, ensure that the in-circuit serial programming (ICSP) interface is accessible on the PCB for factory programming, and that the OTP window is protected from UV exposure in end products. The PLCC socket should be specified with a low-profile, machine-insertable retention feature to withstand industrial shock and vibration. This page synthesizes distributor pricing, drop-in same-package alternatives from Microchip's PIC16C66x family, lifecycle guidance, and practical design notes not found in the manufacturer datasheet.

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PIC16C662T-10I/PQ - 8-Bit OTP MCU, 7KB, 10MHz | Microchip
PIC16C662T-10I/PQ

PIC16C662T-10I/PQ - 8-Bit OTP MCU, 7KB, 10MHz | Microchip

The Microchip Technology PIC16C662T-10I/PQ is an 8-bit EPROM/OTP-based CMOS microcontroller from the PIC16C family, delivering 7KB (4K x 14) of one-time-programmable program memory in a 44-pin MQFP (PQ) package measuring 10x10 mm. It runs at a maximum clock frequency of 10 MHz, is built around a RISC-style Harvard architecture, and is qualified for the industrial temperature range (-40C to +85C). The PIC16C662 is one of the original PIC microcontroller families that established Microchip's dominance in 8-bit embedded design. A microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/EPROM/Flash/OTP), data memory (RAM), and programmable I/O peripherals into one device. 8-bit MCUs sit at the entry point of the embedded hierarchy: microcontroller -> embedded controller -> system-on-chip -> semiconductor. The PIC16C family in particular uses a 14-bit instruction word (rather than 12-bit on PIC16F baseline or 16-bit on PIC18), which makes it well-suited for compact code density in cost-sensitive designs. Key differentiating features of the PIC16C662T-10I/PQ include its 7KB OTP program memory, integrated analog peripherals for mixed-signal embedded designs, industrial-grade -40C to +85C operating range, and 33 programmable digital I/O lines. The 'T' suffix denotes tape-and-reel packaging for high-volume assembly, while 'I' specifies industrial temperature grade and 'PQ' indicates the 44-pin MQFP package. The '10' speed grade designates the 10 MHz maximum clock frequency. Architecturally, the device uses a Harvard structure with separate program and data buses, a 14-bit wide instruction word, and a small register-based file architecture that lets most instructions execute in one instruction cycle (four clock periods). This gives roughly 5 MIPS sustained throughput at 10 MHz - modest by modern standards but sufficient for the appliance, automotive aftermarket, and industrial control applications where the PIC16C662 is typically deployed. OTP (one-time-programmable) memory allows factory or pre-production programming, making the device cost-effective for mature, finalized designs. Typical applications include appliance control boards, motor control front-ends, security panel logic, simple human-machine interface controllers, and industrial sensor signal conditioning. The wide industrial temperature range makes it suitable for outdoor or factory-floor equipment, while the analog peripheral integration removes the need for an external ADC in many designs. Program development uses MPLAB and the PIC16C instruction-set tools, which remain compatible with current MPLAB X IDE. When designing with the PIC16C662T-10I/PQ, note that OTP memory cannot be erased or rewritten - this part is intended for finalized firmware and high-volume production. Engineers should also verify the available in-circuit debugger/signature unit support, since the PIC16C family uses a parallel programming interface rather than the modern ICSP used by PIC16F/PIC18 devices. Always check the latest Microchip product page for current lifecycle status, as some PIC16C variants have been transitioned to last-time-buy or NRND. This page synthesizes distributor stock and pricing data, drop-in PIC16C-family alternatives with the same 44-pin MQFP footprint, and practical design notes - information not consolidated on the manufacturer datasheet or on distributor product pages.

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PIC16C662T-20/PQ - 8-Bit OTP MCU 7KB 20MHz 44-MQFP | Microchip
PIC16C662T-20/PQ

PIC16C662T-20/PQ - 8-Bit OTP MCU 7KB 20MHz 44-MQFP | Microchip

The Microchip Technology PIC16C662T-20/PQ is an 8-bit CMOS microcontroller from the PIC® 16C family featuring 7 KB of One-Time-Programmable (OTP) program memory, 176 bytes of RAM, and 33 I/O pins, housed in a 44-pin MQFP (PQ) surface-mount package. It executes instructions at a 20 MHz clock rate (200 ns instruction cycle) from a 4V to 6V single supply and integrates brown-out detection, a watchdog timer, and two 8-bit timers plus one 16-bit timer/counter on-chip. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash/OTP), working RAM, and peripheral interfaces such as timers, serial ports, ADCs, and I/O pins into one package. Within the broader semiconductor taxonomy, the PIC16C662 belongs to the 8-bit microcontroller class, which sits under the microcontroller (MCU) family, then to embedded controllers, then to microprocessors and finally to digital ICs and semiconductors. The "C" suffix in PIC16C denotes the OTP/EPROM program-memory variant of the mid-range PIC16 architecture, historically used for low- to mid-volume production before Flash-based PIC16F parts became dominant. Key features of the PIC16C662T-20/PQ include its 13-bit instruction word, 14-bit wide program memory, hardware USART/SCI for asynchronous serial communication, capture/compare/PWM (CCP) module, and up to eight analog comparator inputs with programmable on-chip voltage reference. The 44-MQFP PQ package gives 33 general-purpose I/O lines organized across five ports (PORTA through PORTE), enabling direct connection to keypads, LCDs, and external peripherals without external glue logic. The PIC16C662 uses Microchip's classic RISC-like Harvard architecture, where separate program and data buses let the CPU fetch an instruction and access data in a single cycle. OTP memory is programmed once with a device programmer and cannot be erased, which lowers per-unit cost relative to UV-erasable windowed EPROM parts and makes the part well suited to mature, code-stable designs rather than iterative development. Typical applications include industrial control front panels, appliance user-interface controllers, HVAC thermostat boards, security-system keypads, and embedded sensor hubs in automotive and aerospace systems. The wide operating temperature range also supports outdoor and factory-floor deployments. When designing with this part, note that OTP memory cannot be re-programmed in-circuit; prototype and debug with a windowed or Flash equivalent (e.g., PIC16F662 in the same 44-pin footprint) before committing to the production OTP order. Brown-out reset voltage and oscillator configuration are fuse-selected at program time.

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PIC16C662T-20E/L - 8-bit OTP MCU, 20MHz, 44-PLCC | Microchip
PIC16C662T-20E/L

PIC16C662T-20E/L - 8-bit OTP MCU, 20MHz, 44-PLCC | Microchip

The Microchip Technology PIC16C662T-20E/L is an 8-bit RISC microcontroller from the PIC16C family, featuring 7KB (4K x 14) One-Time-Programmable (OTP) program memory, 176 bytes of RAM, and 33 I/O pins. It is housed in a 44-pin PLCC (Plastic Leaded Chip Carrier) package measuring 16.59 x 16.59 mm with J-lead terminal form. The device operates at up to 20 MHz clock speed with an automotive-grade temperature range. A PIC microcontroller (Programmable Interface Controller) is a compact, low-cost RISC-based computing device that integrates a CPU, memory (program ROM/RAM), and programmable peripherals onto a single silicon die. Within the broader taxonomy, PIC16C662 belongs to the 8-bit microcontroller -> microcontroller unit (MCU) -> embedded controller -> semiconductor hierarchy. The PIC16C family uses a Harvard architecture with separate program and data buses, enabling single-cycle instruction execution and deterministic interrupt response - a hallmark of Microchip's mid-range MCU lineup. Key features of the PIC16C662T-20E/L include 7KB OTP program memory (4K x 14-bit words), 176 bytes of general-purpose RAM, 33 digital I/O pins, an integrated analog-to-digital converter, and multiple timer/counter peripherals. The 20 MHz oscillator provides 200 ns instruction cycle time, supporting responsive control loops in real-time systems. The 44-pin PLCC package offers socket-compatible mounting suitable for legacy industrial and automotive designs. The device employs a RISC instruction set with only 35 single-word instructions, simplifying firmware development and accelerating time-to-market. Internal peripherals typically include capture/compare/PWM modules, a USART for asynchronous serial communication, and synchronous serial port (SSP) support for SPI/I2C. Brown-out reset (BOR) and watchdog timer (WDT) enhance system reliability in noisy electrical environments. Typical applications include industrial control systems, automotive body and chassis electronics, appliance controllers, HVAC interface modules, and legacy embedded products requiring field-proven OTP-based firmware storage. The automotive temperature grade (-40C to +125C) and OTP memory make it especially suitable for cost-sensitive high-volume production where in-circuit reprogramming is unnecessary. When designing with this MCU, allocate sufficient PCB real estate for the 44-pin PLCC socket footprint (16.59 x 16.59 mm land pattern with J-lead pads). The OTP memory requires one-time programming - design firmware carefully and validate on windowed or flash-based equivalents first. Ensure oscillator start-up time and POR/BOR timing match your application's power-rail profile. This page synthesizes distributor pricing from DigiKey/Mouser, drop-in alternatives from the same PIC16C66x family, and practical design notes not consolidated in the Microchip datasheet. Cross-brand flash equivalents are noted where applicable for designers needing in-circuit reprogrammability.

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PIC16C662T-20E/PQ - 8-Bit OTP MCU, 7KB, 20MHz, 44-MQFP | Microchip
PIC16C662T-20E/PQ

PIC16C662T-20E/PQ - 8-Bit OTP MCU, 7KB, 20MHz, 44-MQFP | Microchip

The Microchip Technology PIC16C662T-20E/PQ is an 8-bit OTP (One-Time-Programmable) microcontroller from the PIC16C family, featuring 7KB of program memory, 20 MHz maximum operating frequency, and a 44-pin MQFP (10x10 mm) package. The 'T' suffix indicates tape and reel packaging, '-20E' specifies 20 MHz with the extended industrial temperature grade (-40C to +125C), and '/PQ' designates the 44-pin MQFP package. A microcontroller (MCU) is a single-chip computer containing a processor core, memory, and programmable I/O peripherals. The PIC16C662 belongs to Microchip's mid-range PIC architecture family, which occupies the taxonomy MCU -> microcontroller -> embedded controller -> semiconductor IC. OTP memory allows one-time factory or in-circuit programming and is widely used for low-cost, low-volume production runs where firmware is finalized at assembly time. Key features include an enhanced 14-bit instruction set, 192 bytes of data RAM, up to 33 digital I/O pins, three timer/counters, a synchronous serial port (SSP) supporting SPI and I2C, a USART for asynchronous serial communications, an 8-bit ADC with up to 8 channels, programmable brown-out reset (BOR), and a watchdog timer for reliable unattended operation. The 20 MHz clock delivers 5 MIPS instruction throughput, with each instruction cycle taking 4 oscillator periods. Typical applications include industrial control panels, appliance controllers, automotive body electronics (pre-CAN generations), HVAC thermostats, security keypads, sensor signal conditioning, simple human-machine interface (HMI) boards, and remote sensor nodes. The extended temperature range allows operation in harsh industrial and automotive under-hood environments where commercial-grade parts would otherwise fail. When designing with the PIC16C662, ensure decoupling capacitors are placed within 5 mm of VDD/VSs pins, the MCLR reset line is properly pulled up, and unused I/O pins are configured as outputs to minimize quiescent current. Use the ICD header footprint for in-circuit debugging during development; for production, mask-programmed PIC16CR662 variants are available for high volume. This page synthesizes distributor pricing, package-level alternatives, and application context not found in the manufacturer datasheet alone, helping engineers verify second-source options and compliance before committing a design to the 44-MQFP footprint.

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PIC16C662T-20I/PT - 8-Bit OTP MCU, 7KB, 20MHz, 44-TQFP
PIC16C662T-20I/PT

PIC16C662T-20I/PT - 8-Bit OTP MCU, 7KB, 20MHz, 44-TQFP

The Microchip Technology PIC16C662T-20I/PT is an 8-bit CMOS OTP (One-Time Programmable) microcontroller from the PIC® 16C family, delivering 20MHz maximum operating frequency with 7KB of program memory (organized as 4K x 14 words) in a 44-pin TQFP surface-mount package. It integrates 176 bytes of data RAM, 33 digital I/O lines, an internal 8-bit ADC, and a wide 4V to 6V supply range, targeting industrial and embedded-control designs that need deterministic RISC performance without in-system re-programmability. What is a PIC 16C microcontroller? The PIC 16C series is Microchip's classic OTP-ROM 8-bit RISC microcontroller family based on a Harvard architecture with separate program and data buses, typically featuring a 14-bit instruction word, single-cycle instruction execution, on-chip peripherals (timers, ADC, USART, PWM), and ultra-low-power CMOS operation. Within the broader microcontroller taxonomy, the PIC 16C sits under 8-bit MCU -> microcontroller -> embedded controller -> semiconductor device, and historically preceded the flash-based PIC 16F family which is now the dominant mid-range Microchip MCU platform. Key features include a 20MHz maximum clock (200ns instruction cycle), 33 bidirectional I/O pins, an 8-channel 8-bit A/D converter, two 8-bit timers and one 16-bit timer/counter, a watchdog timer with on-chip RC oscillator, and low-power Sleep mode. The device operates across the industrial -40C to +85C temperature range and supports in-circuit serial programming via Microchip's ICSP protocol even though the program memory itself is OTP. The 44-TQFP package exposes all peripheral pins on a compact 10x10mm footprint suitable for space-constrained industrial PCBs. Architecturally, the PIC16C662 uses a RISC core with 35 single-word instructions, a hardware multiplier, and a 14-bit program word width. OTP memory provides one-time field programmability - it is cheaper than windowed EPROM and offers faster access than external EEPROM, but code cannot be erased or rewritten. The 20MHz clock yields 5 MIPS (million instructions per second) throughput, sufficient for motor control, sensor interfacing, and human-machine interface (HMI) panels. Typical applications include industrial control panels, HVAC thermostat controllers, appliance user interfaces, motor-driver front-end controllers, security alarm panels, and small-form-factor sensor hubs. Engineers select this OTP part when unit costs matter and firmware is finalized before production, since OTP ROM is significantly cheaper per bit than flash at high volumes. When designing with this part, note that OTP memory cannot be re-flashed; final firmware must be masked-ordered or field-OTP-programmed before PCB assembly. Plan the ICSP programming fixture and verification steps early. For prototypes and low-volume production, consider migrating to the PIC16F662 flash-based equivalent to allow iterative firmware updates. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, with all data validated as of 2026-09-18.

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PIC16C66T-04/SO - 8-Bit 4MHz 14KB OTP MCU 28-SOIC | Microchip
PIC16C66T-04/SO

PIC16C66T-04/SO - 8-Bit 4MHz 14KB OTP MCU 28-SOIC | Microchip

The Microchip Technology PIC16C66T-04/SO is an 8-bit RISC CMOS microcontroller in the PIC® 16C family, delivering 4 MHz CPU performance, 14 KB (8K x 14) of One-Time-Programmable (OTP) program memory and 368 bytes of data RAM in a 28-pin SOIC wide-body package (7.50 mm). According to the Microchip datasheet for the PIC16C66 family, this device executes 35 single-cycle instructions in 200 ns (except program branches which take two cycles), giving it a deterministic 4 MIPS throughput suitable for cost-sensitive real-time control. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data RAM, and programmable peripherals. The PIC16C66 belongs to the mid-range PIC architecture, which sits between the PIC16C5x baseline family and the enhanced PIC17C family. Within the broader taxonomy: 8-bit MCU -> RISC microcontroller -> embedded controller -> semiconductor. The PIC16C66 is the higher-memory successor of the PIC16C65 and offers enhanced peripherals while retaining code compatibility with the PIC16C6x family. Key features of the PIC16C66T-04/SO include 33 digital I/O lines organized across multiple ports, three 8-bit timer/counters with optional prescalers, a 5-channel 8-bit analog-to-digital converter (ADC), a synchronous serial port (SSP) supporting SPI and I²C, a USART for asynchronous or synchronous communications, a watchdog timer with its own on-chip RC oscillator, and a power-on reset / brown-out reset circuit. It operates from a single 4.5 V to 5.5 V supply and supports in-circuit serial programming (ICSP) for the OTP version. Typical applications include industrial control, motor control, sensor interfacing, automotive body electronics, instrumentation, smart-card readers, and consumer white goods. The 4 MIPS throughput, abundant I/O, and integrated ADC/USART make it ideal for replacing discrete logic in cost-optimized embedded designs. When designing with this part, allocate the OTP window carefully - once programmed, OTP memory cannot be erased, so dev-cycle iterations should use a windowed (JW) or EPROM variant for prototypes. The 28-SOIC wide-body package simplifies hand-soldering and breadboard prototyping but consumes more board area than SSOP equivalents. This page synthesizes distributor pricing, drop-in package-compatible alternatives, and practical design notes not found in the standalone Microchip datasheet - giving engineers a single reference for sourcing, replacement, and design decisions.

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PIC16C66T-04E/SO - 8-Bit 4MHz 14KB OTP MCU, 28-SOIC | Microchip
PIC16C66T-04E/SO

PIC16C66T-04E/SO - 8-Bit 4MHz 14KB OTP MCU, 28-SOIC | Microchip

The Microchip Technology PIC16C66T-04E/SO is an 8-bit RISC CMOS microcontroller belonging to the PIC® 16C family, delivering 14 KB (8K x 14) of One-Time Programmable (OTP) program memory and 368 bytes of data RAM, with a 4 MHz maximum clock input and 5V (4.5V–5.5V) supply, all in a 28-pin SOIC wide-body package. A PIC microcontroller is a Harvard-architecture, RISC-based 8-bit device that executes one instruction per cycle (except program branches, which take two), giving deterministic timing and very low interrupt latency. The PIC16C6X sub-family in particular introduced an enhanced instruction set, 14-bit wide instruction word, 8-level hardware stack, and on-chip peripherals such as capture/compare/PWM and an analog comparator. These MCUs sit within the broader power-management/embedded-control hierarchy: microcontroller -> embedded processor -> digital IC -> semiconductor, and are programmed in C or assembly through Microchip's MPLAB X toolchain. Key features of the PIC16C66T-04E/SO include a 33 I/O pin count (22 strong I/O plus supporting pins), a wide 4.5 V to 5.5 V supply range, automotive temperature grade ('E' suffix indicates -40 °C to +125 °C extended), 200 ns single-cycle instruction time at 20 MHz, and CMOS low-power operation. It is also built on Microchip's mature OTP process, which trades in-system reprogrammability for very low per-unit cost in volume production runs. The on-chip peripheral set includes three timers, a USART, a synchronous serial port (SSP) supporting SPI and I²C, an 8-bit analog-to-digital converter with up to 8 channels, and a capture/compare/PWM module. This integration lets one PIC16C66 replace a discrete MCU plus several support ICs, simplifying PCB layout and BOM cost. Typical applications include industrial control logic boards, automotive body and chassis ECUs, appliance motor control, and legacy embedded subsystems designed before flash-based PICs (PIC16F family) became standard. Its OTP memory makes it especially suited for high-volume, code-stable products where firmware never needs field updates. Designers should note that the '04' speed grade is 4 MHz (versus the '10' and '20' variants that scale to 20 MHz) and the 'E' temperature grade is the -40 °C to +125 °C extended range, not the -40 °C to +85 °C industrial range (which would be 'I'). This page consolidates distributor pricing, pin-compatible drop-in alternatives in the PIC16C66 family, and design notes distilled from the manufacturer datasheet and Microchip cross-reference database - information not aggregated on any single distributor product page.

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PIC16C66T-04I/SO - 8-Bit 4MHz 14KB EPROM MCU 28-SOIC | Microchip
PIC16C66T-04I/SO

PIC16C66T-04I/SO - 8-Bit 4MHz 14KB EPROM MCU 28-SOIC | Microchip

The Microchip Technology PIC16C66T-04I/SO is a 8-bit RISC CMOS microcontroller based on the PIC16C core, featuring 14KB of one-time-programmable (OTP) EPROM program memory and 368 bytes of data RAM, housed in a 28-pin SOIC wide-body package supplied on Tape & Reel. The device operates from a 4.5V to 5.5V supply and is rated for a maximum clock frequency of 4 MHz, with an internal architecture supporting 22 digital I/O lines. A PIC microcontroller (Programmable Integrated Circuit) is a family of low-cost, high-performance, fully-static 8-bit microcontrollers built on a RISC (Reduced Instruction Set Computing) architecture, in the broader category hierarchy of microcontroller -> embedded processor -> semiconductor IC. The PIC16C6X family uses only 35 single-word instructions to learn, with all instructions executing in a single cycle except program branches (two-cycle), giving a deterministic instruction throughput. The 'C' suffix denotes the original EPROM-based PIC16 family, distinguishing it from later flash-based PIC16F parts. Key features include 14KB EPROM program memory (8K x 14-bit words), 368 bytes of data RAM, 22 digital I/O pins, integrated synchronous serial port (SSP) supporting SPI and I2C, an addressable USART, three 8-bit timer/counters plus one 16-bit timer/counter with capture/compare/PWM, an 8-bit analog-to-digital converter (ADC) on select family members, and a watchdog timer with on-chip RC oscillator. The 'T' suffix indicates Tape and Reel packaging, while the 'I' suffix indicates the industrial temperature grade of -40C to +85C. The 28-pin SOIC wide-body (7.50 mm) package is a surface-mount plastic outline with a lead pitch of 1.27 mm, and the device is qualified for industrial operating environments. The PIC16C66T-04I/SO uses a Harvard architecture with separate program and data buses, which allows simultaneous fetch of an instruction and access of a data operand, maximizing throughput at the 4 MHz clock input. Typical applications include industrial control systems, automotive body and chassis electronics, low-power consumer devices, sensor interface front-ends, and embedded control boards where a small package count and well-documented peripheral set are required. The on-chip peripherals (USART, SSP, timers, ADC) reduce external component count for cost-sensitive designs. When designing with this part, note that the 4 MHz rating reflects the maximum oscillator input; at this clock most instructions execute in 1 microsecond, and at 5V supply the device typically draws under 20 mA active. Ensure the MCLR reset, oscillator, and power pins are properly decoupled per the Microchip PIC16C6X datasheet to avoid spurious resets or oscillator start-up issues. This page synthesizes distributor pricing, drop-in and same-family alternatives, and practical design notes not found in a single source on the manufacturer datasheet, helping engineers evaluate and source the PIC16C66T-04I/SO efficiently.

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PIC16C66T-10/SO - 8-Bit 10MHz OTP MCU | Microchip | 28-SOIC
PIC16C66T-10/SO

PIC16C66T-10/SO - 8-Bit 10MHz OTP MCU | Microchip | 28-SOIC

The Microchip PIC16C66T-10/SO is an 8-bit RISC microcontroller from the PIC16C6X family, featuring a 10MHz core, 14KB (8K x 14) One-Time Programmable (OTP) program memory, and 368 bytes of RAM, housed in a 28-pin SOIC package supplied on tape and reel. The 'T' suffix indicates tape-and-reel packaging, '-10' denotes the 10MHz maximum operating speed, and '/SO' specifies the 28-lead Small Outline Integrated Circuit (SOIC) form factor. What is an OTP microcontroller? An OTP (One-Time Programmable) microcontroller is a type of embedded computing device whose program memory can be written to exactly once after manufacture, using a standard device programmer. OTP MCUs occupy a middle ground between mask-ROM parts (programmed at the fab, lowest per-unit cost at high volume) and flash-based MCUs (reprogrammable in-circuit). They are favored for low-to-medium volume production where the unit cost is lower than equivalent flash parts and the firmware is stable. Key features include 33 digital I/O lines, a Harvard RISC architecture with only 35 single-word instructions, and 200ns single-cycle instruction execution (except program branches, which take two cycles). The device integrates analog peripherals (8-channel 8-bit ADC), three timers (Timer0, Timer1, Timer2), a USART, and a synchronous serial port (SSP) supporting SPI and I2C. The PIC16C66 also includes a watchdog timer with its own on-chip RC oscillator for reliable operation. Architecturally, the PIC16C66 uses a 14-bit instruction word and an 8-bit data path, with separate program and data buses (Harvard architecture) that allow instruction fetch and data access in a single cycle. The CMOS design provides low power consumption with operating voltage from 4.0V to 6.0V, making it suitable for both battery and line-powered applications. Typical applications include industrial control systems, consumer electronics, automotive subsystems (non-safety-critical), appliance controls, and embedded instrumentation. The wide peripheral set also makes it suitable for sensor-interface hubs and simple motor-control front-ends. When designing with this device, note that the OTP memory means firmware must be fully validated before programming; emulator or windowed (JW) versions are available for development. The 28-SOIC package is suitable for hand-soldering and rework but requires care with thermal profiling during reflow. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C66T-10E/SO - 8-Bit OTP MCU, 14KB, 10MHz, 28-SOIC
PIC16C66T-10E/SO

PIC16C66T-10E/SO - 8-Bit OTP MCU, 14KB, 10MHz, 28-SOIC

The Microchip Technology PIC16C66T-10E/SO is an 8-bit RISC CMOS microcontroller from the PIC16C6X family, delivering 10 MIPS performance at 10 MHz clock input in a 28-pin SOIC (SO) wide-body package supplied on tape and reel. According to the manufacturer datasheet, this automotive-temperature-grade device integrates 14 KB (8K x 14) of One-Time-Programmable (OTP) program memory and 368 bytes of data RAM, with 22 digital I/O lines, and is qualified for the -40C to +125C automotive operating range. A microcontroller (MCU) is a single-chip computer that contains a processor core, program and data memory, peripherals, and I/O. Within the broader taxonomy, the PIC16C66 belongs to the 8-bit microcontroller class -> RISC microcontroller sub-class -> PIC16C OTP family, sitting at the intersection of embedded control and general-purpose computation. The PIC16C6X family uses a Harvard architecture with separate program and data buses, 35 single-word instructions, and an instruction set optimized for compiled C and hand-written assembly. Key features include a maximum 10 MHz external clock (200 ns instruction cycle, except 2-cycle branches), hardware peripherals such as two 8-bit timers, one 16-bit timer, a Watchdog Timer (WDT), PWM module, Brown-out Detect/Reset (BOR), Power-on Reset (POR), a 10-bit ADC, and three serial interfaces (I2C/SPI, USART). The OTP program memory is windowless and is programmed once with a device programmer, suiting cost-sensitive production runs that do not require firmware updates. Architecturally, the PIC16C66 uses a 14-bit wide program word and an 8-bit data path, with 8-level deep hardware stack and 4 banks of register file. The 22 I/O pins are arranged across PORTA, PORTB, PORTC, and a partial PORTD, each with individually programmable direction registers. The industrial/automotive temperature grade (-40C to +125C) and CMOS low-power design (typical < 2 mA run current at 5 V / 10 MHz) make the part well suited to harsh-environment control loops. Typical applications include automotive body and chassis control modules, industrial motor drives, sensor signal conditioning, HVAC control, and battery-powered instrumentation. The combination of OTP memory, USART, and PWM is particularly well-matched to closed-loop control of solenoids, valves, and small DC actuators. When designing with this device, allocate a 5 V +/- 10% rail for VDD and reserve a decoupling ceramic of 0.1 uF within 5 mm of the supply pin. A 4 MHz to 10 MHz crystal with two load capacitors is required for the oscillator; ceramic resonator configurations are also supported per the datasheet. This page consolidates distributor pricing, same-family and cross-brand drop-in alternatives, application guidance, and engineering design notes that go beyond the manufacturer datasheet to accelerate component selection.

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PIC16C66T-10I/SO - 8-Bit 10MHz OTP MCU 14KB | Microchip
PIC16C66T-10I/SO

PIC16C66T-10I/SO - 8-Bit 10MHz OTP MCU 14KB | Microchip

The Microchip Technology PIC16C66T-10I/SO is an 8-bit RISC microcontroller built on a CMOS, fully-static architecture, featuring a 10 MHz core clock, 14 KB (8K x 14) of One-Time Programmable (OTP) program memory and 368 bytes of data RAM, housed in a 28-pin Small Outline (SOIC, 0.295 inch / 7.50 mm width) package supplied on Tape and Reel. The PIC16C66 family delivers 35 single-word instructions, all single-cycle except for program branches which are two-cycle, giving an instruction cycle time of 200 ns at 20 MHz maximum input and 400 ns at 10 MHz. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral I/O on one die. The PIC16C6X family belongs to the broader PIC16 mid-range line, sitting in the hierarchy RISC CPU -> 8-bit microcontroller -> embedded controller -> semiconductor. OTP (One-Time Programmable) memory uses EPROM cells that can be programmed once and cannot be erased, positioning this family between mask-ROM (cheapest at volume) and Flash (rewritable) for production runs with stable firmware. Key features include 22 digital I/O lines arranged across ports A, B and C, three hardware timer modules (Timer0, Timer1 and Timer2), a USART serial port, a synchronous serial port (SSP) supporting SPI and I2C master/slave, a 10-bit multi-channel analog-to-digital converter (ADC), and an internal watchdog timer with on-chip RC oscillator. The device operates from 4.5 V to 5.5 V supply, supports DC to 20 MHz clock input (200 ns instruction cycle), and includes Power-on Reset, Brown-out Reset and Power-Saving Sleep mode. The architecture is a Harvard-class design with separate program and data buses, a 14-bit wide instruction word, and a deeply pipelined single-cycle ALU. The OTP EPROM cell technology, ceramic-windowed UV-erasable equivalent (PIC16C66 JW), and Microchip's baseline toolchain (MPLAB IDE, MPASM assembler, MPLAB-C compiler) gave this family wide adoption in the 1990s and early 2000s in industrial control, instrumentation and consumer appliances. Typical applications include motor control (small DC fans, solenoids), industrial instrumentation front-ends, smart-card readers, security and alarm panels, automotive body electronics (non-safety), and consumer appliances requiring deterministic 8-bit control. The 22 I/O pins easily interface keypads, LCD character modules, EEPROM memories, and low-speed sensors. When designing with this part, ensure Vdd decoupling is placed within 5 mm of the supply pin with at least 0.1 uF ceramic plus 10 uF bulk, and that the MCLR reset pin uses the recommended 10 kohm pull-up plus 100 nF delay network. Because this is an OTP device, firmware must be fully validated in windowed or Flash-equivalent prototypes (PIC16F66 / PIC16C66 JW) before committing to OTP programming for production. This page synthesizes real distributor inventory, parametric drop-in alternatives, and practical design notes not found in the standalone datasheet PDF.

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PIC16C66T-20/SO - 8-Bit 20MHz OTP MCU 14KB | Microchip
PIC16C66T-20/SO

PIC16C66T-20/SO - 8-Bit 20MHz OTP MCU 14KB | Microchip

The Microchip Technology PIC16C66T-20/SO is an 8-bit CMOS RISC microcontroller from the PIC16C6X family, operating at up to 20 MHz with 14 KB (8K x 14) of One-Time Programmable (OTP) program memory and 368 bytes of data RAM, housed in a 28-pin Small Outline IC (SOIC) package with gull-wing leads. The "T" suffix indicates tape-and-reel packaging for high-volume assembly, while the "20" denotes the 20 MHz maximum clock speed and "/SO" specifies the 28-SOIC outline. A microcontroller (MCU) is a single-chip computer containing a CPU core, non-volatile program memory, working RAM, and programmable I/O peripherals. Within the broader taxonomy, the PIC16C66 sits as a mid-range 8-bit MCU under Microchip's classic PIC16C OTP family, which was widely adopted in the late 1990s and early 2000s for cost-sensitive embedded control. The 8-bit RISC Harvard architecture executes 35 single-word instructions, with all instructions completing in one cycle except program branches (two cycles), giving an effective throughput close to one instruction per clock. Key features of the PIC16C66T-20/SO include 22 digital I/O pins arranged across multiple ports, three timer/counter modules (Timer0, Timer1, and Timer2), a synchronous serial port configurable as SPI or I2C, a USART for asynchronous serial communication, an 8-bit ADC with up to 8 input channels, and a capture/compare/PWM (CCP) module. The device supports DC to 20 MHz clock input across a 2.5 V to 6.0 V supply range, integrated power-on reset, brown-out reset, watchdog timer with dedicated oscillator, and programmable code protection. The PIC16C66's architecture separates program and data buses (Harvard), allowing instruction fetch and data access to occur in the same clock cycle. This yields deterministic instruction timing that simplifies real-time control. OTP program memory enables rapid prototyping with one-week-turn ROM mask follow-up for production volumes - a design pattern Microchip promoted throughout the 1990s industrial and appliance market. Typical applications include appliance controllers (washing machines, microwave ovens, HVAC thermostats), industrial automation (sensor conditioning, motor speed control), automotive body electronics (window lift, seat control, instrument cluster peripherals), consumer electronics (remote controls, toys, small appliances), and embedded data-acquisition front-ends. The 22 I/O and 8-channel ADC are well-matched to multi-sensor control boards requiring both analog measurement and digital actuation. When designing with this part, note that OTP memory cannot be reprogrammed in-circuit, so firmware must be validated on a windowed (UV-erasable) PIC16C66-20/JW or PIC16F-series flash equivalent before committing to OTP production units. Always provide bulk decoupling (100 nF plus 10 uF) close to VDD/VSS and reserve the MCLR pin for a proper reset network to avoid spurious brown-out events. This page synthesizes distributor pricing, drop-in PIC16C66 family variants, and practical design considerations not collected in the original 1990s Microchip datasheet.

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PIC16C66T-20E/SO - 8-Bit 20MHz OTP MCU 14KB | Microchip
PIC16C66T-20E/SO

PIC16C66T-20E/SO - 8-Bit 20MHz OTP MCU 14KB | Microchip

The Microchip Technology PIC16C66T-20E/SO is a member of the PIC16C6x family of 8-bit CMOS microcontrollers with One-Time Programmable (OTP) program memory, housed in a 28-pin Small-Outline IC (SOIC, 0.295 inch / 7.50 mm width) package. The device operates at a maximum clock frequency of 20 MHz, integrates 14 KB (8K x 14) of OTP program memory and 368 x 8 bytes of data RAM, and is offered in a Tape & Reel (TR) shipping format indicated by the 'T' suffix. What is a PIC16C microcontroller? PIC16C is Microchip's legacy 8-bit OTP/EPROM MCU family using a RISC-style Harvard architecture with 35 single-cycle instructions, a hardware multiplier on select variants, and a separate 14-bit program bus from the 8-bit data bus. The PIC16C6x sub-family adds enhanced peripherals (USART, capture/compare/PWM, 8-bit ADC on some members) versus the simpler PIC16C5x baseline. Within the broader taxonomy this places PIC16C66 as: 8-bit MCU -> RISC microcontroller -> PIC microcontroller -> embedded controller -> semiconductor IC. Key features include 14 KB (8K x 14 word) OTP program memory, 368 bytes of data RAM, 20 MHz maximum clock, a wide 4.0 V to 6.0 V supply range for the extended (-40C to +125C) industrial/automotive temperature grade, USART serial port, capture/compare/PWM modules, 8-bit A/D converter channels, and 22 I/O pins. The '20E' suffix indicates a 20 MHz maximum clock with the extended temperature grade, while 'SO' specifies the 28-pin SOIC package. The PIC16C66 architecture uses a 14-bit instruction word and a two-stage instruction pipeline, providing deterministic single-cycle instruction execution at the oscillator clock rate (except for program branches which take two cycles). The 'E' extended temperature grade and the part's mature CMOS process make it suitable for automotive and industrial environments where higher-temperature operation and proven long-term reliability are required. Typical applications include industrial control nodes, automotive body and chassis subsystems, appliance controllers, and embedded sensor interfaces. It is well matched to designs that need more code space and more peripheral channels than the PIC16C6x baseline while staying within an OTP-programmable cost structure. Design consideration: OTP memory cannot be re-programmed in-circuit, so plan code development on a windowed (JW) or Flash-equivalent part, then commit the final code image to the PIC16C66T-20E/SO for production. The 4.0-6.0V supply range excludes direct 3.3V system use. This page synthesizes distributor pricing from DigiKey and Octopart, real-time stock signals, drop-in PIC16C66 family alternatives (same 28-SOIC footprint, same 20 MHz clock, same 14 KB OTP memory map), and practical OTP programming notes not aggregated on any single distributor page.

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PIC16C66T-20I/SO - 8-Bit 20MHz MCU 14KB OTP 28-SOIC | Microchip
PIC16C66T-20I/SO

PIC16C66T-20I/SO - 8-Bit 20MHz MCU 14KB OTP 28-SOIC | Microchip

The Microchip Technology PIC16C66T-20I/SO is an 8-bit RISC microcontroller from the PIC16CXX family, operating at up to 20 MHz with 14KB (8K x 14) of One-Time Programmable (OTP) program memory, housed in a 28-pin SOIC (SO) package. It integrates 368 bytes of RAM, 22 digital I/O pins, and three serial communication peripherals: I2C (MSSP), SPI, and UART/USART. The "T" suffix denotes tape-and-reel packaging and the "I" suffix indicates the industrial temperature grade (-40C to +85C). A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, working RAM, and programmable I/O peripherals. The PIC16C66 belongs to Microchip's mid-range PIC family, which uses a Harvard RISC architecture with 35 single-word instructions and a 14-bit program word. In the broader taxonomy, MCUs sit within semiconductors -> microcontrollers -> 8-bit microcontrollers -> PIC16CXX family -> PIC16C6X sub-family. Most instructions execute in a single 200 ns instruction cycle at 20 MHz, while program branches take two cycles, yielding deterministic timing suitable for embedded control. Key features of the PIC16C66T-20I/SO include three timer/counter modules (Timer0, Timer1, and Timer2), a 5-channel 8-bit ADC, an analog comparator, a capture/compare/PWM (CCP) module, and a watchdog timer with its own on-chip RC oscillator. The device operates from 4.5V to 5.5V, has 22 I/O lines capable of sinking up to 25 mA for direct LED drive, and supports in-circuit serial programming (ICSP) through RB6/RB7. The PIC16C66 architecture combines a RISC CPU with a unified 14-bit instruction word, allowing efficient code density and predictable interrupt latency. Its OTP program memory is programmed once at production and cannot be erased, making the part ideal for mature, high-volume, cost-sensitive products where firmware is frozen. Per Microchip's pin and code compatibility chart, the PIC16C66 is pin-compatible with other members of the PIC16C6X family in the 28-pin SPDIP/SOIC package. Typical applications include industrial control subsystems, appliance controllers, sensor interfaces, automotive body electronics (non-safety), instrumentation front-ends, and consumer device main boards. Industrial automation is a strong fit thanks to the 22 strong I/O lines, three serial interfaces, and -40C to +85C operating range. When designing with this part, ensure that in-circuit programming lines (RB6/RB7) are accessible and that decoupling is placed within a few millimetres of VDD. Choose the PIC16F66 instead if you need Flash memory and in-field reprogrammability; the PIC16C66 OTP is final. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes for the PIC16C66T-20I/SO not found in the manufacturer datasheet alone.

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PIC16C67-04/L - 8-Bit 4MHz 14KB OTP MCU | Microchip | PLCC-44
PIC16C67-04/L

PIC16C67-04/L - 8-Bit 4MHz 14KB OTP MCU | Microchip | PLCC-44

The Microchip Technology PIC16C67-04/L is an 8-bit CMOS OTP (One-Time Programmable) RISC microcontroller operating at up to 4 MHz instruction rate, with 14 KB (8K x 14) of program memory and 368 bytes of SRAM, housed in a 44-pin PLCC package. It is part of Microchip's PIC16C6x mid-range family and features 33 digital I/O lines, a 5-channel 8-bit ADC, two capture/compare/PWM modules, a USART, and a synchronous serial port. A microcontroller (MCU) is a single-chip computer containing a processor core, memory, and programmable I/O peripherals. The PIC16C family sits within the 8-bit microcontroller hierarchy: MCU -> 8-bit MCU -> PIC -> PIC16 mid-range -> PIC16C6x OTP family. It is designed for embedded control applications where deterministic instruction timing, low power, and simple peripheral integration are prioritized over raw processing throughput. Key features of the PIC16C67-04/L include 35 single-cycle instructions (200 ns per instruction at 20 MHz oscillator, 1 us at 4 MHz), a wide operating voltage range of 2.5 V to 6.0 V, and three operating temperature grades: commercial, industrial, and extended. The device uses Harvard architecture with separate program and data buses, allowing instruction fetch to occur in parallel with operand access. It draws only 15 uA typical at 5 V / 4 MHz and 1 uA typical at 3 V / 32 kHz, making it suitable for battery-backed or sleep-dominant designs. Typically applied in industrial control front-ends, automotive body electronics, sensor signal conditioning, and embedded instrumentation, the PIC16C67-04/L was widely adopted in the late 1990s and early 2000s as a workhorse OTP MCU. Its OTP memory is one-time programmable and cannot be erased, so this part is intended for high-volume production where firmware is final and field updates are not required. When designing with this part, verify OTP memory constraints for your firmware revision strategy early in the project. For prototypes or products requiring field updates, choose a Flash-based PIC16F equivalent. The 44-pin PLCC footprint is socketable, which simplifies development lab programming and final assembly.

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PIC16C67-04/P - 8-Bit 4MHz 14KB OTP MCU 40-PDIP | Microchip
PIC16C67-04/P

PIC16C67-04/P - 8-Bit 4MHz 14KB OTP MCU 40-PDIP | Microchip

The Microchip Technology PIC16C67-04/P is an 8-bit CMOS microcontroller built on the PIC16C6X RISC core, delivering 4 MHz operation from 14 KB of one-time-programmable (OTP) program memory in a 40-pin PDIP (0.600 inch, 15.24 mm) through-hole package. It integrates 368 bytes of RAM, 33 digital I/O lines, and a Harvard bus architecture that executes a single instruction per 200 ns cycle using only 35 single-word instructions. The part combines the PIC16C66 peripheral set (USART, MSSP/SPI/I2C, capture/compare/PWM, 8-channel 8-bit ADC) and is targeted at high-performance yet low-cost embedded applications. According to the manufacturer datasheet, the family shares a wide operating voltage range up to 6.0 V and supports commercial, industrial, and extended temperature grades, with low-power consumption rated at 15 µA typical at 5 V / 4 MHz and 1 µA typical at 3 V / 32 kHz. What is a PIC16C6X microcontroller? The PIC16C6X family is a low-cost, high-performance, CMOS, fully-static, 8-bit microcontroller series based on Microchip's PIC RISC architecture. Positioned in the taxonomy, it belongs to the PIC16 mid-range family, which sits between the baseline PIC10/12/16 and the enhanced PIC17/18 architectures; within the broader microcontroller -> embedded MCU -> semiconductor hierarchy, these OTP-EPROM devices serve as one-time programmable alternatives to flash-based PIC16F counterparts, preserving pin-for-pin compatibility with the flash variants. Key features include a Harvard bus, single-cycle instruction execution at 4 MHz, 14 interrupt sources with on-chip peripherals, an 8-bit successive-approximation ADC with up to eight input channels, a USART for serial communication, and a master SSP supporting both SPI and I2C. The 8-level hardware stack and 15 special-function hardware registers are mapped into the data memory map. The PIC16C67-04/P uses a low-power, high-speed CMOS EPROM/ROM process with a fully static design that allows the clock to be stopped without losing register state. With a 14-bit instruction word, 8-bit data path, and 200 ns instruction cycle at 4 MHz, it achieves roughly 5 MIPS throughput, which historically was sufficient for motor control, instrumentation, and consumer product designs. Typical applications include industrial control systems, white goods and appliance controllers, automotive body electronics (pre-CAN era), smart sensor nodes, and battery-powered instrumentation where the 1 µA standby current enables long-life operation. Designers chose this part when code lock or OTP security was preferred over flash reprogrammability. When designing with the PIC16C67-04/P, plan for OTP programming: code must be verified before production programming because OTP cannot be erased. Always provide a decoupling capacitor within 5 mm of VDD/VDD2 pins and reserve a 4-pin ICSP header for production programming. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C67-04/PQ - 8-Bit 4MHz 14KB OTP MCU | Microchip
PIC16C67-04/PQ

PIC16C67-04/PQ - 8-Bit 4MHz 14KB OTP MCU | Microchip

The Microchip Technology PIC16C67-04/PQ is an 8-bit CMOS microcontroller from the PIC16C6x family, delivering 4 MHz CPU performance with 14 KB (8K x 14) of One-Time-Programmable (OTP) EPROM program memory and 368 bytes of RAM, housed in a 44-pin MQFP (10x10 mm) package. It features 33 digital I/O pins, a RISC architecture with only 35 single-word instructions, and a fully static design that supports DC to 4 MHz clock operation. The device is fabricated using low-power, high-speed CMOS EPROM/ROM technology and operates from a wide supply voltage range. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (ROM/Flash and RAM), and peripheral interfaces on one die. PIC microcontrollers from Microchip use a Harvard RISC architecture that executes one instruction per clock cycle (except program branches), delivering deterministic throughput for embedded control. Within the power-management and embedded-control hierarchy, MCUs sit above discrete logic and below DSPs/SoCs; the PIC16C6x mid-range family targets cost-sensitive, general-purpose embedded designs where deterministic timing, low power, and ease of programming outweigh raw computational throughput. Key features of the PIC16C67-04/PQ include low-power consumption of 15 microamps typical at 5V/4 MHz and 1 microamp typical at 3V/32 kHz, a wide operating voltage range up to 6.0V, and commercial, industrial, and extended temperature variants. The 33 I/O pins share peripherals such as timers, a synchronous serial port (SSP) supporting SPI/I2C, a USART, capture/compare/PWM modules, and an 8-bit ADC, making it suitable for mixed-signal embedded products. Power management includes power-on reset, brown-out detection, watchdog timer with on-chip RC oscillator, and code protection. Architecturally, the PIC16C67-04 uses a 14-bit instruction word with an 8-bit data path, a 13-bit program counter capable of addressing 8K words, and a two-level deep hardware stack. The OTP EPROM cell allows one-time field programming using a standard EPROM programmer; for prototype volume production the windowed JW variant enables UV erasure. This combination of deterministic execution, generous on-chip peripherals, and legacy-compatible tooling explains why the PIC16C67 family remains a baseline reference in many industrial and automotive subsystems designed in the 1990s. Typical applications include industrial control subsystems, HVAC fan and damper controllers, automotive body electronics (climate, lighting, seat modules), instrumentation front-ends, security panel keypads, and small consumer appliances. Designers also use it for board-level glue logic replacement where 20-30 discrete logic ICs can be consolidated into a single programmed MCU, reducing BOM cost and PCB area. When designing with the PIC16C67-04/PQ, remember that OTP memory can be programmed only once; for prototyping, use the PIC16C67-04/JW windowed variant or migrate to a Flash-based PIC16F877 in the same 44-pin QFP footprint. The maximum clock rate is 4 MHz for the -04 speed grade; for higher throughput in the same package, use the -10 or -20 speed grades. Always verify OTP programmer socket adapter compatibility for MQFP-44 packages. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not consolidated on a single manufacturer page. Cross-references are anchored to the Microchip PIC16C6x datasheet and DigiKey/Mouser listing data.

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PIC16C67-04/PT - 8-bit MCU, 14KB OTP, 4MHz, 44-TQFP | Microchip
PIC16C67-04/PT

PIC16C67-04/PT - 8-bit MCU, 14KB OTP, 4MHz, 44-TQFP | Microchip

The Microchip PIC16C67-04/PT is an 8-bit RISC microcontroller from the PIC16C6x family, featuring 14KB (8K x 14) one-time-programmable EPROM program memory, 368 bytes of RAM, and 33 digital I/O pins, housed in a 44-pin TQFP surface-mount package. It operates at up to 4 MHz clock speed with a wide 2.5V to 6.0V supply range and is built on Microchip's low-power, high-speed CMOS EPROM/ROM technology with a fully static design. The device is part of the PIC® 16C mid-range family and supports Commercial, Industrial, and Extended temperature grades. What is a microcontroller? A microcontroller (MCU) is a single-chip computer containing a processor core, program memory, working RAM, I/O peripherals, and timers. Within the broader taxonomy it sits between microprocessors and system-on-chips (SoCs); an 8-bit MCU like the PIC16C67 trades absolute throughput for deterministic behavior, low cost, and ultra-low power draw. The PIC16C6x family in particular uses Harvard architecture with separate program and data buses, RISC instruction set, and OTP/EPROM/ROM program memory options. This makes MCUs like the PIC16C67-04/PT suitable for embedded control tasks where reliability and simplicity outweigh raw compute. Key features include 14KB EPROM program memory (8K x 14 word width), 368 bytes of data RAM, 33 I/O pins across five ports, three timers, a USART, an MSSP module supporting SPI and I2C, an 8-bit ADC with 8 channels, and a watchdog timer. The /04 speed grade designates a 4 MHz maximum oscillator input, while the /PT suffix indicates the 44-pin TQFP (Thin Quad Flat Pack) package delivered in tray packaging. Pin count and memory size make this device one of the largest members of the PIC16C6x generation. Architecturally, the PIC16C67 uses a 14-bit instruction word and a 35-instruction RISC set, allowing most instructions to execute in a single clock cycle (250 ns at 4 MHz). The Harvard bus separates program fetches from data accesses so the CPU can pre-fetch the next instruction while reading data, improving throughput without pipelining. Brown-out reset (BOR), power-on reset (POR), and the watchdog timer provide robustness in electrically noisy industrial environments. Typical applications include industrial control subsystems, automotive body and chassis electronics (pre-CAN era designs), HVAC controls, appliance controllers, instrumentation front-ends, and embedded sensor conditioning where 33 I/O lines, three timers, and a built-in ADC reduce external component count. Designers also use it for upgrading legacy 8051 designs that need simpler firmware and lower power. When designing with this part, plan for OTP programming: firmware bugs cannot be patched in-circuit, so emulator or windowed-ceramic-DIP samples should be used for development. Decoupling caps (0.1 uF plus 10 uF bulk) should be placed within 5 mm of VDD/VSS pins. Because the device is in a legacy product family, check Microchip's lifecycle page before committing to a long-life program.

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PIC16C67-04E/P - 8-Bit 4MHz 14KB OTP MCU 40-PDIP | Microchip
PIC16C67-04E/P

PIC16C67-04E/P - 8-Bit 4MHz 14KB OTP MCU 40-PDIP | Microchip

The Microchip Technology PIC16C67-04E/P is an 8-bit RISC microcontroller from the PIC16C6X family, featuring 14KB (8K x 14) of One-Time-Programmable (OTP) EPROM program memory, 368 bytes of RAM, and 33 digital I/O pins in a 40-pin PDIP through-hole package with automotive temperature grade (-40C to +125C). Operating from a 4.5V to 5.5V supply, the device runs at 4 MHz clock input with a 200 ns single-cycle instruction time and is fully static, allowing DC to maximum clock operation. An 8-bit microcontroller (MCU) is a small computer-on-a-chip integrating a CPU, program memory (ROM/EPROM/Flash), data memory (RAM), and peripherals into a single IC. Within the broader semiconductor taxonomy, MCUs sit under microcontrollers, which are a sub-category of integrated circuits, which themselves belong to the logic IC family in power management and embedded system hierarchies. The PIC16C6X family specifically uses a Harvard-architecture RISC core with only 35 single-word instructions, making it one of the easiest assembly languages for embedded engineers to learn. Key features include 8-bit core width, 4 MHz maximum clock, 14KB OTP program memory (8K x 14 words), 368 bytes of data RAM, 33 I/O pins, three timer/counter modules, a 10-bit (approximate, depending on revision) ADC with multiple channels, and integrated peripherals including Universal Synchronous/Asynchronous Receiver-Transmitter (USART), Serial Peripheral Interface (SPI), and Inter-Integrated Circuit (I2C) for serial communication. Brown-out Reset (BOR), Power-on Reset (POR), and Watchdog Timer (WDT) are standard. The architecture uses CMOS EPROM technology with a Harvard-style separate program and data bus, single-cycle instruction execution (200 ns at 20 MHz), and two-cycle branches. The "-04" speed suffix denotes 4 MHz maximum clock input; the "-04" variant is the lower-speed grade, with "-10" (10 MHz), "-20" (20 MHz) being other grades. The "E" suffix indicates the extended automotive temperature range (-40C to +125C), and "/P" designates the 40-pin PDIP plastic through-hole package. Typical applications include industrial control and factory automation, automotive subsystems (instrumentation, simple sensor interfaces), consumer electronics (appliance control boards), HVAC controllers, and legacy embedded systems where OTP-based MCU with proven long-term supply is required. The wide temperature range also suits outdoor or harsh-environment installations. When designing with this part, note that OTP memory cannot be reprogrammed - production code must be verified before burn-in. Use the parallel programming mode via ICSP or a gang programmer for volume production. A stable decoupling capacitor (100 nF ceramic + 10 uF bulk) close to VDD/VSS pins is recommended. This page synthesizes distributor pricing, drop-in OTP-MCU alternatives, and practical design notes not found in the manufacturer datasheet alone, including automotive-grade and industrial-grade PIC16C6X family cross-references.

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PIC16C67-04E/PQ - 8-bit 4MHz OTP MCU, 44-MQFP | Microchip
PIC16C67-04E/PQ

PIC16C67-04E/PQ - 8-bit 4MHz OTP MCU, 44-MQFP | Microchip

The Microchip Technology PIC16C67-04E/PQ is an 8-bit CMOS microcontroller from the PIC16C6X family, featuring 14KB (8K x 14) of One-Time Programmable (OTP) program memory, 368 bytes of data RAM, and a maximum clock speed of 4 MHz, all housed in a 44-pin MQFP (10x10 mm) package. The "E" suffix denotes the Extended temperature grade (-40C to +125C), while the "04" indicates the 4 MHz maximum operating frequency and "PQ" identifies the 44-MQFP package. A PIC16C microcontroller belongs to the family of low-cost, high-performance, fully-static 8-bit CMOS microcontrollers built on Microchip's RISC architecture. Within the broader system hierarchy, a PIC16C6X MCU sits below: PIC microcontroller -> 8-bit RISC MCU -> embedded controller -> semiconductor device. The 16C series uses EPROM/ROM-based program memory rather than Flash, making it suitable for mature, stable production runs where code changes are infrequent. Key features include 33 digital I/O pins, three timer/counter modules (Timer0, Timer1, Timer2), a 10-bit multi-channel Analog-to-Digital Converter (ADC), a Universal Synchronous Asynchronous Receiver Transmitter (USART), and a Capture/Compare/PWM (CCP) module. The device supports both parallel (parallel slave port) and serial programming modes and offers low-power consumption: typical 15 uA at 5V/4 MHz and 1 uA at 3V/32 kHz in sleep mode. The PIC16C67 is built on a Harvard architecture with separate program and data buses, executing most instructions in a single instruction cycle (4 clock cycles). This RISC design delivers predictable real-time performance with only 35 single-word instructions to learn. The wide operating voltage range of 2.5V to 6.0V (per the PIC16C6X datasheet family specification) supports battery-backed and industrial environments. Typical applications include industrial control systems, motor control front-ends, sensor interfacing boards, instrumentation, and embedded legacy products where PIC16C codebases are maintained. The 33 I/O pins and integrated peripherals also suit automotive accessory controllers and HVAC interface modules within the Extended temperature range. When designing with this device, ensure in-circuit serial programming (ICSP) access is preserved on the PCB for OTP programming, and budget for a quartz crystal or resonator since the 04 speed grade specifies a 4 MHz maximum clock. Decoupling capacitors should be placed adjacent to VDD/VSS pairs to maintain ADC accuracy. This page consolidates distributor pricing, drop-in same-package alternatives, and practical design notes not found in the standalone manufacturer datasheet.

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PIC16C67-04E/PT - 14KB OTP 8-bit MCU, 4MHz, 44-TQFP | Microchip
PIC16C67-04E/PT

PIC16C67-04E/PT - 14KB OTP 8-bit MCU, 4MHz, 44-TQFP | Microchip

The Microchip Technology PIC16C67-04E/PT is an 8-bit CMOS EPROM/ROM-based microcontroller from the PIC® 16C family, featuring 14KB (8K x 14) of One-Time Programmable (OTP) program memory, 368 bytes of RAM, and 33 digital I/O pins. The device operates at a maximum clock speed of 4 MHz and is housed in a 44-pin TQFP (PT) surface-mount package with industrial/extended temperature grade (E suffix). It uses an external oscillator and is built on Microchip's low-power, high-speed CMOS EPROM/ROM technology with a fully static design. A PIC microcontroller (Programmable Interface Controller) is a family of 8-bit, 16-bit, and 32-bit RISC-based microcontrollers originally developed by General Instrument's Microelectronics Division and popularized by Microchip Technology. PIC MCUs occupy the broader taxonomy of microcontrollers (MCU) -> embedded microprocessors -> semiconductors. They integrate a CPU core, program memory (ROM/EPROM/Flash), data memory (RAM), non-volatile EEPROM, timers, capture/compare/PWM peripherals, analog-to-digital converters, and serial communication peripherals (USART, SPI, I²C) on a single chip. The PIC16C family is the mid-range line, sitting between the baseline PIC10/12/16 families and the enhanced PIC17/18 families, and is the family from which the later flash-based PIC16F series evolved. Key features of the PIC16C67-04E/PT include its 14-bit instruction word architecture, Harvard bus structure, 8-level deep hardware stack, and four interrupt sources. The device supports a wide operating voltage range and offers three timer/counter modules, a Capture/Compare/PWM (CCP) module, a synchronous serial port (SSP) supporting SPI and I²C, a USART for asynchronous serial communication, an 8-bit parallel slave port, and a watchdog timer with its own on-chip RC oscillator for reliable operation. Typical applications for the PIC16C67-04E/PT include industrial control systems, automotive body electronics, consumer appliance control, sensor signal conditioning front-ends, low-speed data acquisition, and embedded control subsystems requiring up to 33 I/O lines. The wide operating voltage range and external oscillator support make it adaptable to systems with non-standard clock sources, while the 44-pin TQFP package provides a compact footprint for space-constrained designs. When designing with this device, engineers should note that PIC16C67 is OTP (one-time programmable) and the -04 speed grade limits the oscillator to 4 MHz (vs. the -10 and -20 speed grades available). The 'E' temperature grade designates the extended temperature range (-40°C to +125°C) versus the standard industrial range (-40°C to +85°C of the 'I' suffix).

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