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PIC16C662T-04/L

PIC16C662T-04/L - 8-Bit 4MHz OTP MCU, 7KB, 44-PLCC | Microchip

The Microchip Technology PIC16C662T-04/L is an 8-bit PIC® 16C-series RISC microcontroller (MCU) built around a Harvard architecture with 7KB of One-Time-Programmable (OTP) program memory organized as 4K x 14 words, 176 bytes of data RAM, and 33 digital I/O pins. The device operates at up to 4 MHz clock input (200 ns instruction cycle) and is housed in a 44-pin PLCC surface-mount package. The '/L' suffix denotes the PLCC package, while the 'T' indicates Tape & Reel packaging, and '-04' specifies the 4 MHz speed grade. What is an OTP microcontroller? An OTP MCU is a type of embedded controller whose program memory can be written only once using a device programmer, after which the contents are permanent (non-erasable). It belongs to the broader family of microcontrollers, which themselves fall under the hierarchy of microprocessors → computing ICs → integrated circuits. OTPs occupy a middle ground between mask-ROM MCUs (lowest unit cost at very high volumes) and flash-based MCUs (re-programmable, higher unit cost), making them popular for cost-sensitive, mature production designs where firmware is stable and field updates are not required. Key features include 35 single-cycle instructions (200 ns except for program branches which take two cycles), a 14-bit instruction word, integrated peripherals such as Brown-out Detect/Reset (BOR), Power-on Reset (POR) and Watchdog Timer (WDT), and a commercial operating temperature grade. The PIC16C662 also provides multiple interrupt sources and a programmable timer/counter subsystem. As a member of the mid-range PIC16C family, it is source- and object-code compatible with many siblings, easing migration within the platform. Typical applications include appliance controls, industrial automation modules, HVAC interface boards, automotive body controllers (non-safety subsystems), security keypads, and embedded user-interface controllers where a stable firmware image, deterministic execution, and low unit cost are priorities. The 33 I/O pins allow direct drive of LED indicators, keypads, and discrete logic. When designing with this part, verify that your firmware has been fully validated before committing to OTP programming because field updates are impossible. The OTP window also requires a specialized programmer that applies programming pulses above VDD; check the Microchip device programmer documentation for compatibility. The 4 MHz speed grade offers the lowest cost; consider the -20 (20 MHz) variants if higher throughput is required. This page synthesizes XAIPART distributor pricing, same-family drop-in alternatives in the same 44-PLCC footprint, and practical design notes (oscillator, programming, brown-out) that are not collected in a single place on the manufacturer product page or on distributor listings.

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PIC16C662T-04E/L

PIC16C662T-04E/L - 8-Bit 4MHz OTP MCU 7KB | Microchip

The Microchip Technology PIC16C662T-04E/L is an 8-bit CMOS microcontroller from the PIC16C6x family, featuring 7KB (4K x 14) of One-Time Programmable (OTP) program memory and 176 bytes of RAM in a 44-pin PLCC (Plastic Leaded Chip Carrier) J-lead package. It runs at 4 MHz clock input with 200 ns single-cycle instruction execution (except two-cycle branches), operates from a 4.5V to 5.5V supply, and exposes 33 I/O pins across multiple ports, suiting it to embedded control tasks in industrial and automotive environments. 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. Within the broader taxonomy, the PIC16C662 belongs to the RISC microcontroller family -> 8-bit MCU -> embedded controller -> semiconductor IC. The PIC16C6x family specifically emphasizes Harvard-architecture RISC design with only 35 instructions, simplifying firmware development and code verification for production fleets. Key features include 7KB OTP program memory (one-time programmable, suitable for low-to-medium volume production where firmware is stable), 176 bytes of general-purpose RAM, 33 digital I/O lines, and 20 MHz maximum oscillator input (the "-04" suffix denotes the 4 MHz speed grade). The 44-PLCC package is JEDEC-standard, surface-mountable, and supported by a wide ecosystem of sockets and carriers for both production and prototype environments. From an architectural perspective, the PIC16C662 uses a 14-bit instruction word with a single accumulator (W) plus a file-register-based data memory map. Its RISC pipeline delivers deterministic 200 ns instruction cycles at 4 MHz (or 100 ns at 20 MHz), simplifying real-time control loop timing. The OTP memory reduces per-unit cost versus flash while requiring careful pre-production firmware verification, since post-programming code changes are not possible. Typical applications include automotive body and chassis controllers, industrial automation subsystems, appliance control boards, and legacy embedded products requiring long-term microchip supply continuity. The 33 I/O pins and 7KB code space are well-matched to mid-complexity control logic with several switch inputs, relay outputs, and serial communications. When designing with this part, plan the firmware verification process before committing to OTP programming, since parts cannot be re-programmed. The automotive temperature grade ("-E" suffix, -40C to +125C) and PLCC-44 footprint make it drop-in compatible with other PIC16C662 variants in the same family, simplifying second-source qualification. This page synthesizes verified distributor pricing, same-family drop-in alternatives, and practical design notes for legacy PIC16C662 designs not found in any single distributor listing or manufacturer page.

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PIC16C662T-04E/PT

PIC16C662T-04E/PT - 8-bit MCU, 7KB OTP, 33 I/O | Microchip

The Microchip Technology PIC16C662T-04E/PT is an 8-bit RISC CMOS microcontroller with 7 KB (4K x 14) of One-Time-Programmable (OTP) program memory and 176 bytes of RAM, housed in a 44-pin TQFP (PT) surface-mount package. It operates from a 4 V to 6 V supply, supports up to 33 digital I/O lines, and runs at a 4 MHz maximum clock rate (the -04 speed grade). An 8-bit microcontroller (MCU) is a small programmable computer on a single integrated circuit that combines a CPU, memory, and peripherals. Within the broader semiconductor hierarchy, MCUs belong to microcontrollers -> microcomputers -> processors -> semiconductors. The PIC16C6x family specifically targets low-power, cost-sensitive embedded control where deterministic instruction execution (a single-cycle RISC core) and a rich peripheral set matter more than raw clock speed. Key features of the PIC16C662 include its 14-bit instruction word, 8-level hardware stack, two 8-bit timers and one 16-bit timer/counter, a Watchdog Timer with its own on-chip RC oscillator, an analog comparator, a capture/compare/PWM (CCP) module, and a synchronous/asynchronous serial port (USART/SCI). The part also offers power-saving SLEEP mode, in-circuit serial programming (ICSP) capability, and programmable code protection. Architecturally, the PIC16C662 uses a Harvard-class RISC core with separate program and data buses, which lets a 14-bit instruction fetch and an 8-bit data read occur in the same Tcy. This yields predictable 4 MHz performance at 4 MHz oscillator input on the -04 speed grade and predictable interrupt latency for real-time control loops. Typical applications include white-goods and appliance control, low-end industrial automation, automotive body and interior modules, HVAC fan and damper control, and battery-powered instrumentation where the OTP memory and CMOS low-power design provide a favorable cost-per-function ratio. The wide 33-I/O count also makes it suitable for keyboard-scanning, LED-driving, and simple user-interface boards. When designing with this device, note that OTP memory is one-time programmable and cannot be erased, so firmware must be fully validated before programming. Decoupling, ground-return integrity, and an external oscillator or resonator circuit (if accuracy beyond the internal RC is required) are the three most common layout items to review. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, with cross-references to PIC16C662 variants for engineers seeking pin-compatible alternatives.

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PIC16C662T-04I/L

PIC16C662T-04I/L - 8-Bit 4MHz OTP MCU, 7KB | Microchip | Industrial

The Microchip Technology PIC16C662T-04I/L is an 8-bit RISC microcontroller from the PIC16C family, featuring 7KB (4K x 14) of One-Time-Programmable (OTP) program memory and 176 bytes of RAM, operating at a maximum clock speed of 4 MHz. It is housed in a 44-pin PLCC (Plastic Leaded Chip Carrier) package with J-bend leads, measuring 16.59 mm x 16.59 mm, and is rated for the industrial temperature range of -40C to +85C. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and a set of programmable I/O peripherals. The PIC16C family uses Microchip's classic Harvard-architecture RISC core, which separates program and data buses to allow simultaneous instruction fetch and data access. Within the broader semiconductor taxonomy, the PIC16C662 sits at: microcontroller -> 8-bit MCU -> embedded controller -> integrated circuit. OTP variants like this one are programmed once and cannot be erased, making them suitable for mature, fixed-function industrial products where field updates are not required. Key features of the PIC16C662T-04I/L include 33 programmable digital I/O pins, an integrated analog comparator, a capture/compare/PWM (CCP) module, and a watchdog timer for reliable operation in electrically noisy environments. The 4 MHz oscillator drives a 1 us instruction cycle (4 clocks per instruction), delivering roughly 1 MIPS of throughput, which is sufficient for human-machine interface (HMI) controllers, sensor aggregators, and appliance control boards. The 44-pin PLCC package provides through-hole-friendly J-lead terminations that simplify prototyping and rework while still being surface-mountable on industrial assembly lines. The device operates from a 2.5 V to 5.5 V supply and includes brown-out reset (BOR) and power-on reset (POR) circuitry to protect against low-voltage programming or lock-up conditions. Its RISC core provides 35 single-word instructions, allowing most operations to complete in one instruction cycle. The architecture is well documented and supported by Microchip's MPLAB development ecosystem, including the MPASM assembler and legacy C compilers. Typical applications for the PIC16C662T-04I/L include industrial control panels, HVAC thermostat controllers, appliance user interfaces, vending machine logic boards, and legacy embedded products that require a long-lifecycle 8-bit controller with stable, mature firmware. The industrial temperature grade makes it well suited to factory automation and outdoor equipment enclosures. A key design consideration is that OTP memory cannot be re-programmed; therefore, development and firmware validation should be performed on a UV-erasable PIC16C662 windowed sample or a pin-compatible PIC16F flash variant before committing to OTP production. Engineers should also plan for PCB land pattern compatibility with the 44-PLCC footprint to allow future migration to a flash-based PIC16F equivalent if firmware updates become necessary. This page synthesizes distributor pricing, drop-in compatible alternatives, and practical design notes that complement the manufacturer datasheet and help engineers evaluate lifecycle, sourcing, and second-source options for long-running industrial programs.

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PIC16C662T-04I/PQ

PIC16C662T-04I/PQ - 4MHz 8-bit OTP MCU, 7KB ROM, 44-MQFP | Microchip

The Microchip Technology PIC16C662T-04I/PQ is an 8-bit RISC CMOS microcontroller in the PIC16CXXX family, featuring 4096 x 14-bit words (7 KB) of One-Time Programmable (OTP) EPROM program memory, 176 bytes of data RAM, and a maximum operating frequency of 4 MHz. The device is housed in a 44-pin Metric Quad Flat Pack (MQFP) package supplied on Tape & Reel and operates from a single 5 V supply across the industrial -40C to +85C temperature range, as denoted by the I suffix in the part number. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, I/O peripherals and interrupt logic onto one silicon die. Within the broader taxonomy, PIC microcontrollers sit under microcontroller -> embedded processor -> integrated circuit -> semiconductor. PIC16C-series OTP parts target cost-sensitive, low-volume and legacy embedded designs where the firmware is finalized before mask programming and field updates are not required. Key features of the PIC16C662 include a 14-bit instruction word, an advanced RISC Harvard architecture, 33 single-word instructions, a hardware timer/counter, parallel slave port, and integrated analog comparator peripherals. The 40-pin/44-pin PIC16C64X and PIC16C66X family is upward-compatible with smaller 28-pin PIC16CXXX members, allowing code reuse across product variants. Power consumption is in the low milliamp range typical of CMOS PIC devices. The PIC16C662 architecture uses a separate 14-bit program bus and 8-bit data bus (Harvard), enabling most instructions to execute in a single 250 ns instruction cycle at 4 MHz oscillator frequency. The device includes power-on reset, brown-out reset, watchdog timer, and code-protection bits. Peripherals include a synchronous serial port (SSP) for SPI/I2C, a USART, capture/compare/PWM modules, and analog comparators on selected pins. Typical applications include industrial control logic, appliance controllers, automotive body electronics (non-safety), instrumentation front-ends, and replacement of older PIC16C5X designs where a 14-bit instruction word is required. The 44-pin MQFP footprint exposes a generous I/O count suitable for keypad scanning, LCD drive, and multi-channel sensor interfaces. When designing with this part, remember that OTP ROM cannot be re-programmed, so allocate a separate PIC16C66X flash variant (e.g., PIC16F877) for prototypes, and verify the I-grade (-40C to +85C) temperature window against your enclosure thermal profile. Programming requires the Microchip PM3 or MPLAB ICD tools. This page synthesizes distributor stock, pricing and drop-in alternative data not available in a single manufacturer document, including recommended same-package drop-in replacements from the PIC16C662 family and verified cross-brand pin-compatible parts.

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PIC16C662T-04I/PT

PIC16C662T-04I/PT - 8-Bit 4MHz 7KB OTP MCU TQFP-44 | Microchip

The Microchip Technology PIC16C662T-04I/PT is an 8-bit RISC microcontroller from the PIC16C family, featuring 7KB (4K x 14) of One-Time-Programmable (OTP) program memory and operating at speeds up to 4MHz. It is housed in a 44-pin TQFP (10x10 mm) surface-mount package and is supplied on tape and reel, with an industrial operating temperature grade (-40C to +85C). An 8-bit microcontroller (MCU) is a small computer-on-a-chip that integrates a CPU, RAM, program memory, and peripherals into a single IC. The PIC16C family uses a RISC (Reduced Instruction Set Computer) Harvard architecture with 35 single-cycle instructions, delivering deterministic execution and a high MIPS-per-mHz ratio. PIC microcontrollers sit in the broader category of embedded MCUs -> microcontrollers -> integrated circuits -> semiconductors, and they form the backbone of countless industrial, consumer, and automotive subsystems. OTP memory allows one-time programming during manufacturing, making the PIC16C662 well suited to high-volume cost-sensitive applications where firmware stability is fixed at production time. Key features of the PIC16C662T-04I/PT include 7KB (4K x 14) OTP program memory, 176 bytes of RAM, and operating voltage range of 4V to 6V. It integrates multiple peripherals: a 5-channel 8-bit A/D converter, two 8-bit timers and one 16-bit timer, a Watchdog Timer, an LCD driver module (up to 4 common, 32 segments typical), 33 digital I/O pins, and a synchronous serial port (SSP) supporting SPI and I2C. Industrial temperature grade and CMOS low-power technology make it suitable for embedded control panels. The architecture follows Microchip's enhanced PIC16C mid-range core with 14-bit instruction width, supporting interrupts, hardware stack, and in-circuit serial programming (ICSP). Compared to flash-based F-series successors, the C-series OTP provides lower unit cost at high volume but does not support field reprogramming - this is an intentional design trade-off for stable production firmware. Typical applications include appliance control boards, HVAC interface panels, industrial sensor readers, security keypads, automotive dashboard sub-modules, and any high-volume embedded control where OTP memory is acceptable. It is also common in legacy industrial systems that standardized on the PIC16C platform. When designing with this part, note that the OTP memory requires programming during PCB assembly using a Microchip device programmer. Provide a clean 5V supply and respect the 4-6V operating range. The LCD driver module eliminates external LCD controller chips, reducing BOM cost in human-machine interface designs. This page synthesizes distributor pricing, drop-in same-package alternatives (PIC16C662T-04E/PT, PIC16C662-04I/P family members), and practical design notes not aggregated on a single distributor page.

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PIC16C662T-10/L

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

The Microchip Technology PIC16C662T-10/L is a member of the PIC® 16C family of 8-bit CMOS RISC microcontrollers featuring 7KB (4K x 14) of One-Time-Programmable (OTP) program memory, packaged in a 44-pin PLCC (J-Lead) form factor. It operates from a 5V supply, runs at up to 10 MHz clock speed, and targets embedded control applications where deterministic RISC execution and legacy OTP code storage are preferred over flash-based parts. An 8-bit microcontroller is a single-chip computer that integrates a CPU core, program memory, data RAM, and peripheral set on one die; the PIC16C662 family sits inside the broader PIC® 16C family, which itself belongs to the Microchip PIC® mid-range (14-bit instruction word) architecture. The 16C-series parts use a Harvard RISC core with a 14-bit-wide instruction word and 8-bit data path, giving a compact code footprint for low-to-moderate complexity control loops. PIC16C6xx devices are commonly deployed in industrial and commercial embedded systems where stable, OTP-based code storage is acceptable and a 44-pin PLCC package is preferred for through-hole or socketed designs. Key features of the PIC16C662T-10/L include 192 bytes of data RAM, a 14-bit instruction word, multiple timer/counter peripherals, a synchronous serial port (SSP) supporting SPI/I2C master and slave modes, and a parallel slave port. The device provides 33 digital I/O pins and supports interrupt-driven control with a programmable watchdog timer. The OTP program memory allows one-time programming in production, providing robust code retention without external EEPROM in many applications. The PIC16C662 architecture uses a two-stage pipeline with a single accumulator and W-register working scheme; the 14-bit instruction word includes literal data and control fields, allowing most instructions to execute in one instruction cycle (four clock periods) at 10 MHz. Built-in brown-out reset and power-on reset circuitry improves system reliability in industrial environments where supply rails may be noisy or slowly rising. Typical applications include industrial control panels, appliance controllers, motor drive interface boards, instrument front-ends, security alarm panels, and legacy embedded systems migrating from 16C-series designs. The wide commercial operating range (0C to +70C) and PLCC socket compatibility make this part a drop-in fit for established production lines. The OTP memory is well suited to high-volume production runs where code has stabilized and field firmware updates are not required. When designing with the PIC16C662T-10/L, pay attention to oscillator configuration (XT/HS/RC modes supported), ensure the PLCC socket is keyed correctly, and reserve an additional flash-based PIC16F part as a backup option if future firmware revisions are anticipated. The commercial temperature grade makes this variant better suited to benign environments than the -I industrial variant. This page synthesizes distributor pricing, verified cross-reference alternatives drawn from Microchip's own Pin and Code Compatibility chart, and engineering design guidance not found on a single datasheet page, giving procurement and design teams a consolidated view of the PIC16C662T-10/L for sourcing and BOM decisions.

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PIC16C662T-10/PQ

PIC16C662T-10/PQ - 8-Bit OTP MCU, 7KB, 10MHz, 44-MQFP | Microchip

The Microchip Technology PIC16C662T-10/PQ is an 8-bit RISC microcontroller from the PIC16C family, featuring 7KB (4K x 14) of One-Time Programmable (OTP) program memory, 176 bytes of data RAM, and a maximum clock speed of 10 MHz, housed in a 44-pin MQFP (10x10 mm) surface-mount package. The "T" suffix indicates tape-and-reel packaging, the "/PQ" suffix denotes the Metric Quad Flat Pack (MQFP-44) variant, and the "-10" speed grade specifies a 10 MHz oscillator. It is built on a CMOS process and integrates Brown-Out Detect (BOD), two analog comparators, Power-On Reset (POR), timers, and a Watchdog Timer (WDT). An 8-bit microcontroller (MCU) is a programmable computing engine that executes instructions on 8-bit data paths and serves as the embedded brain of consumer appliances, industrial controllers, and legacy automotive subsystems. MCUs sit below microprocessors in the silicon hierarchy and above discrete logic, integrating CPU core, non-volatile program memory, working RAM, and peripherals into a single die. The PIC16C family targets cost-sensitive applications where OTP programmability, deterministic instruction timing, and small footprint are valued over in-system re-programmability. Key features of the PIC16C662T-10/PQ include 22 I/O pins with individually programmable direction, a 14-bit instruction word, a Harvard architecture with separate program and data buses, and a wide operating voltage range typical of the PIC16C series. The device is well-suited to applications that require moderate code density (4K words), low power consumption, and analog signal conditioning via on-chip comparators. Typical applications include appliance control boards, industrial sensor interfaces, security and access-control panels, HVAC actuators, and legacy embedded products. Designers typically pair it with external EEPROM or serial ADC peripherals when non-volatile data storage or higher-resolution analog input is required. When designing with the PIC16C662T-10/PQ, ensure the OTP window is masked if code security is required, and account for the 10 MHz oscillator ceiling when selecting crystal or resonator components. Because this is an OTP device, firmware verification must be performed on-window or on pre-programmed parts before final commit; consider a flash-based PIC16F equivalent if in-field firmware updates are required.

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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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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PIC16C662T-04/L - 8-Bit 4MHz OTP MCU, 7KB, 44-PLCC | Microchip

PIC16C662T-04E/L - 8-Bit 4MHz OTP MCU 7KB | Microchip

PIC16C662T-04E/PT - 8-bit MCU, 7KB OTP, 33 I/O | Microchip

PIC16C662T-04I/L - 8-Bit 4MHz OTP MCU, 7KB | Microchip | Industrial

PIC16C662T-04I/PQ - 4MHz 8-bit OTP MCU, 7KB ROM, 44-MQFP | Microchip

PIC16C662T-04I/PT - 8-Bit 4MHz 7KB OTP MCU TQFP-44 | Microchip

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

PIC16C662T-10/PQ - 8-Bit OTP MCU, 7KB, 10MHz, 44-MQFP | Microchip

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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