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PIC16C64A-20I/P - 8-Bit CMOS MCU 3.5KB EPROM 20MHz DIP-40
PIC16C64A-20I/P

PIC16C64A-20I/P - 8-Bit CMOS MCU 3.5KB EPROM 20MHz DIP-40

The Microchip Technology PIC16C64A-20I/P is an 8-bit CMOS EPROM/ROM-based microcontroller (MCU) built on the PIC16C mid-range architecture, delivering 20 MHz (200 ns instruction cycle) performance in a 40-pin Ceramic DIP (CDIP) windowed package. It integrates 3.5 KB of EPROM program memory, 128 bytes of RAM, 33 digital I/O lines, and a peripheral set that includes timers, a synchronous serial port (SSP) and USART — sufficient headroom for legacy industrial control designs that must be serviced or re-programmed in-circuit via the on-package quartz window. A microcontroller (MCU) is a single-chip computer containing a CPU, program memory, working RAM, I/O peripherals and interrupt logic on one die. The PIC16C family is a Harvard-architecture, RISC 8-bit line using a 14-bit instruction word and only 35 single-word instructions, positioned in Microchip's classic mid-range hierarchy (PIC12C/PIC16C -> PIC16 family -> 8-bit PIC microcontrollers -> Microcontrollers -> Integrated Circuits). EPROM-based 'C' parts allow field re-programming through UV erasure, which is critical for legacy field-serviced equipment and is one of the few remaining ways to recover firmware when the original source is lost. Key features include a wide operating voltage range of 2.5 V to 6.0 V, an industrial temperature range of -40 C to +85 C, 8-bit-wide data path, 22 interrupt sources and an instruction set optimized for compiled C throughput. The EPROM windowed package supports 1000+ erase/program cycles, and the fully-static design permits clock frequencies from DC up to 20 MHz, enabling low-power sleep modes for battery-sustained instruments. Watchdog timer, power-on reset and brown-out protection are integrated on-chip. Typical applications include industrial process controllers, instrumentation front-ends, motor-control signal conditioning, security panel logic, and automotive aftermarket subsystems. The 40-pin DIP form factor and standard PIC16C64A pinout also make this part attractive for maintaining legacy test fixtures and educational platforms where through-hole solderability matters more than board density. When designing with this device, ensure a regulated 5 V supply with adequate bulk decoupling near the VDD pins, route the quartz or ceramic resonator traces short and guarded, and use the EPROM window only with a proper UV eraser cover to avoid accidental data loss from ambient light. A 33 I/O budget and 128-byte RAM set the upper bound on concurrent tasks; engineers should validate stack depth for deeply nested C code. This page synthesizes distributor pricing, drop-in same-family replacements, and practical design notes that are not collected in any single manufacturer datasheet, giving procurement engineers and embedded designers a single reference for the PIC16C64A-20I/P.

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PIC16C64A-20I/PQ - 8-bit MCU 3.5KB EPROM 33 I/O | Microchip
PIC16C64A-20I/PQ

PIC16C64A-20I/PQ - 8-bit MCU 3.5KB EPROM 33 I/O | Microchip

The Microchip Technology PIC16C64A-20I/PQ is an 8-bit CMOS EPROM-based microcontroller in the PIC16C6X family, delivering 3.5KB of one-time-programmable program memory, 128 bytes of RAM, and 33 digital I/O pins. Housed in a 44-pin MQFP (PQ) surface-mount package, it operates from a 2.5V to 6.0V supply and runs up to 20 MHz, with a 200 ns instruction cycle and 35 single-word RISC instructions. Industrial temperature grade (-40C to +85C) is indicated by the I suffix, while 20 denotes the 20 MHz maximum clock. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, RAM, and peripherals such as timers, communication ports, and I/O. The PIC16C6X family is built on Microchip's enhanced Harvard RISC architecture, which separates program and data buses for higher throughput than traditional von Neumann designs. In the broader taxonomy: PIC16C6X -> PIC16 family -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. EPROM-based OTP parts like the PIC16C64A are suited for low-to-medium volume production where firmware is finalized and in-system flash updates are not required. Key differentiating features of the PIC16C64A-20I/PQ include three hardware timers (Timer0, Timer1, Timer2), a synchronous serial port (SSP) supporting SPI and I2C, a USART for asynchronous serial communication, an 8-bit parallel slave port, and a 5-channel 8-bit ADC. Capture/Compare/PWM (CCP) module supports pulse-width modulation and signal measurement. The 33 I/O pins are 5V-tolerant within the supply range, and a programmable brown-out reset (BOR) and watchdog timer (WDT) improve robustness in industrial environments. Architecturally, the PIC16C64A-20I/PQ uses a 14-bit instruction word and an 8-bit data path, with a two-stage pipeline and 35 single-word instructions, only one of which (program branch) takes two cycles. The fully static design allows the clock to be stopped without losing state, enabling sleep currents of a few microamps for battery-friendly operation. The MQFP-44 (PQ) package provides 33 I/O plus supply, ground, MCLR, oscillator, and reference pins, surefire drop-in for designs already using PIC16C64A on 44-pin MQFP footprints. Typical applications include industrial control front-ends, sensor signal conditioning with ADC, motor control via CCP/PWM, embedded serial-connected peripherals, and legacy factory automation controllers. Because the part is windowless and EPROM-based, it is most appropriate for products shipping into stable, long-life programs rather than iterative development. A newer revision (PIC16C65B) is recommended for new designs per Microchip's own product page, but the PIC16C64A-20I/PQ remains in active use for maintenance, repair, and legacy board replacements. When designing with this part, place a 100 nF decoupling capacitor close to VDD, route MCLR through a 10 kohm pull-up to VDD, and select a crystal or resonator that meets the 20 MHz limit. Watch the EPROM/OTP limitation carefully: code must be fully validated before programming, since UV-erase windowing is not present on the PQ package. Cross-check the 33 I/O allocation against any 5V analog input requirements, since the ADC reference and digital thresholds share pin pairs. This page synthesizes distributor pricing, drop-in alternatives within the PIC16C6X family, lifecycle guidance, and practical design notes not collected in any single manufacturer datasheet - aimed at engineers who need to qualify, source, or substitute the PIC16C64A-20I/PQ in existing or near-clone designs.

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PIC16C64A/JW - 8-Bit 20MHz 3.5KB EPROM MCU | Microchip
PIC16C64A/JW

PIC16C64A/JW - 8-Bit 20MHz 3.5KB EPROM MCU | Microchip

The Microchip Technology PIC16C64A/JW is an 8-bit CMOS microcontroller from the PIC® 16C family, featuring a 20 MHz maximum clock speed, 3.5 KB (2K x 14) of one-time-programmable EPROM program memory, and 128 bytes of RAM, all packaged in a 40-pin windowed CERDIP (0.600 inch / 15.24 mm) through-hole package with a UV-erasable quartz window for development and prototyping reuse. The PIC16C64A/JW provides 33 digital I/O pins, a 12-bit instruction word architecture, and operates across a wide 2.5 V to 6.0 V supply range with fully static design supporting DC to 20 MHz operation, making it suitable for both battery-powered and industrial embedded systems. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/EPROM/Flash), working RAM, and programmable I/O peripherals into one package. EPROM-based MCUs like the PIC16C64A/JW store their program in electrically-programmable read-only memory that can be erased by exposing the die to ultraviolet light through the package window — a workflow favored for iterative development before transitioning to one-time-programmable or mask-ROM production versions. Within the broader semiconductor taxonomy, this part sits in the hierarchy MCU -> 8-bit microcontroller -> embedded controller -> integrated circuit -> semiconductor. Key features of the PIC16C64A/JW include low-power consumption (15 µA typical at 5 V / 4 MHz; 1 µA typical at 3 V / 32 kHz), a wide 2.5–6.0 V operating range, a synchronous serial port (SSP) supporting SPI and I²C master/slave modes, a USART with on-chip baud-rate generator, three hardware timers (Timer0 8-bit, Timer1 16-bit, Timer2 8-bit with PWM), an 8-bit ADC, and a programmable watchdog timer with on-chip RC oscillator for reliable operation. The Harvard RISC architecture executes most instructions in a single 200 ns cycle at 20 MHz, and the 14-bit wide instruction word delivers higher code density than 8-bit CISC architectures. Typical applications for the PIC16C64A/JW include industrial control subsystems, automotive body and chassis electronics, appliance controls, security and alarm panels, sensor signal conditioning, and low-power remote monitoring nodes. The windowed CERDIP package allows engineers to erase and reprogram the device during firmware iteration, making it especially useful in engineering development environments, university teaching labs, and small-volume or legacy maintenance scenarios where a Flash-based migration path is not yet validated. Designers should note that the PIC16C64A is now an older generation; Microchip recommends considering the pin-compatible PIC16C65B or a newer PIC16F family device for new designs. When using the JW (windowed) variant, provide a labeled socket and avoid prolonged exposure of the quartz window to direct sunlight, which can degrade EPROM retention.

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PIC16C64AT-04/L - 8-Bit OTP MCU, 4MHz, 3.5KB EPROM, 44-PLCC | Microchip
PIC16C64AT-04/L

PIC16C64AT-04/L - 8-Bit OTP MCU, 4MHz, 3.5KB EPROM, 44-PLCC | Microchip

The Microchip Technology PIC16C64AT-04/L is an 8-bit RISC microcontroller from the PIC16C family, featuring 3.5KB of One-Time Programmable (OTP) EPROM organized as 2K x 14 words, 128 bytes of RAM, and a maximum clock speed of 4MHz. Housed in a 44-pin PLCC (Plastic Leaded Chip Carrier) J-leaded package measuring 16.59 x 16.59 mm, this commercial-temperature-grade device is supplied on Tape & Reel packaging for high-volume assembly. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + data), and programmable I/O peripherals on one die. The PIC16C family uses a Harvard RISC architecture with a 14-bit instruction word and an 8-bit data path, belonging to the broader hierarchy of microcontroller -> embedded processor -> semiconductor device. PIC MCUs are widely used for low-power, deterministic control tasks where simple peripherals and predictable interrupt response are more important than raw compute throughput. Key features of the PIC16C64AT-04/L include its OTP EPROM program memory (3.5KB), 33 digital I/O lines, a 5V nominal operating supply, an integrated 8-bit timer/counter, and a Watchdog Timer for safe operation. The "04" speed grade specifies a 4MHz maximum oscillator frequency, while the "T" suffix denotes the Tape & Reel packaging variant and "L" denotes the PLCC package. The EPROM-based memory means this part is intended for production programming only, not field re-programmability. Architecturally, the device uses a single-accumulator RISC core with a two-stage pipeline and 35 single-word instructions, most of which execute in a single instruction cycle (250 ns at 4MHz). The 14-bit instruction width allows a large opcode space relative to its 8-bit data bus, and the Harvard separation of program and data buses eliminates fetch-decode conflicts, yielding deterministic throughput. The on-chip peripherals are mapped into a small register file accessible through banked addressing. Typical applications for the PIC16C64AT-04/L include industrial control logic, automotive body electronics (non-safety subsystems), appliance controllers, sensor interface boards, and simple human-machine interface (HMI) panels that need deterministic real-time response. The 44-pin PLCC package also gives engineers a socketable footprint for prototyping and low-volume assembly, which simplifies device replacement during board bring-up. When designing with this part, note that OTP memory cannot be erased or rewritten - firmware must be fully validated before programming. The 4MHz speed grade limits instruction throughput to roughly 4 MIPS, so compute-intensive algorithms must be offloaded or written efficiently. For new designs, Microchip recommends the flash-based PIC16F series as the modern equivalent with in-circuit programmability.

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PIC16C64AT-04/PQ - 8-Bit 4MHz OTP MCU 44-MQFP | Microchip
PIC16C64AT-04/PQ

PIC16C64AT-04/PQ - 8-Bit 4MHz OTP MCU 44-MQFP | Microchip

The Microchip Technology PIC16C64AT-04/PQ is an 8-bit CMOS RISC microcontroller belonging to the PIC16C family, featuring 3.5KB (2K x 14 words) of One-Time Programmable (OTP) program memory and 128 bytes of data RAM. The device operates at a maximum clock speed of 4 MHz from a 5 V supply and is housed in a 44-pin Metric Quad Flat Pack (MQFP, 10x10 mm) package suitable for surface-mount assembly. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data RAM, and peripheral interfaces such as timers, serial ports, and I/O lines. The PIC16C series belongs to the broader hierarchy: microcontroller -> embedded processor -> semiconductor IC. The PIC16C64A core implements a RISC Harvard architecture with only 35 single-word instructions, enabling compact code density and deterministic interrupt response favored in legacy industrial and embedded designs. Key differentiating features include the OTP program memory (factory- or field-programmable, not re-programmable in-circuit), 33 digital I/O pins distributed across multiple ports, three timers including a watchdog timer, a synchronous serial port (SSP) supporting SPI and I2C master modes, and a USART for asynchronous serial communication. The device supports a commercial operating temperature range of 0C to +70C. At the architectural level, the PIC16C64AT-04/PQ uses a 14-bit instruction word with an 8-bit data path. The 4 MHz oscillator input yields a 1 MHz instruction cycle (4 clocks per instruction), which is adequate for control-loop and human-interface tasks typical of late-1990s embedded products. Power consumption is held low through CMOS design and the SLEEP power-down mode. Typical applications include industrial control panels, HVAC thermostat controllers, automotive body electronics (non-safety), consumer appliance interfaces, and legacy communication equipment where PIC16C firmware is already deployed. The 'T' suffix denotes tape-and-reel packaging, and the '04' speed grade corresponds to a 4 MHz maximum clock. When designing with this part, note that OTP memory requires a device programmer and a UV-eprom eraser if windowed parts are used; the part cannot be re-flashed in the field. Engineers migrating designs to flash-based PIC16F equivalents benefit from code-compatibility and pin-compatibility for most PIC16C64A variants. This page synthesizes distributor pricing, drop-in alternatives, application notes, and practical design guidance not consolidated in the manufacturer datasheet.

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PIC16C64AT-04/PT - 8-bit OTP MCU, 3.5KB, 33 I/O, TQFP-44 | Microchip
PIC16C64AT-04/PT

PIC16C64AT-04/PT - 8-bit OTP MCU, 3.5KB, 33 I/O, TQFP-44 | Microchip

The Microchip Technology PIC16C64AT-04/PT is an 8-bit CMOS OTP microcontroller in the PIC16CXX family, delivering 4 MHz CPU performance with 3.5 KB (2K x 14) of one-time-programmable program memory, 128 bytes of RAM, and 33 digital I/O pins, all packaged in a 44-pin TQFP (PT) form factor. A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data memory, and programmable I/O peripherals on one silicon die. The PIC16CXX family, announced in the early 1990s, was the first to combine Harvard architecture, RISC instruction set, CMOS process, and OTP program memory, becoming the industry reference for low-cost embedded control. Within the broader taxonomy, this part sits at: PIC16C64A -> PIC16CXX -> PIC16 family -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. Pin-compatible second sources include PIC16C64A (no A-suffix die revision) and PIC16C642 (lower-pin-count variant). Key features include 35 single-word instructions, a 14-bit instruction word, an 8-level hardware stack, two 8-bit timer/counters, a Watchdog Timer with on-chip RC oscillator, programmable code protection, an analog comparator, and a synchronous serial port (SSP). The device operates from 4.0 V to 6.0 V over -40 C to +85 C (industrial) or 0 C to +70 C (commercial). Architecturally, the PIC16C64A uses a RISC pipeline with a two-stage instruction fetch/execute, two hardware register banks for fast context save, and a wide variety of interrupt sources. The T-suffix indicates tape-and-reel packaging, the -04 indicates the 4 MHz speed grade, and the /PT suffix denotes the 44-pin TQFP package. Typical applications include industrial control, sensor interfacing, low-power embedded systems, automotive in-cabin modules, and legacy equipment maintenance. Choose this part when you need to sustain production of a proven design rather than redesign around newer silicon. When laying out the PCB, follow Microchip appnote AN585 for TQFP-44 land pattern recommendations. Decouple each VDD/VSS pair with a 100 nF ceramic capacitor placed within 5 mm of the pins, and assign MCLR/VPP to a dedicated test point for in-circuit programming. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet, supporting rapid sourcing decisions for production and field replacement.

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PIC16C64AT-04E/L - 8-Bit OTP MCU 4MHz 3.5KB EPROM PLCC | Microchip
PIC16C64AT-04E/L

PIC16C64AT-04E/L - 8-Bit OTP MCU 4MHz 3.5KB EPROM PLCC | Microchip

The Microchip PIC16C64AT-04E/L is an 8-bit RISC microcontroller from the PIC16C6X family with 3.5KB (2K x 14) of One-Time Programmable (OTP) EPROM program memory, 128 bytes of RAM, and 33 digital I/O pins, housed in a 44-pin PLCC (J-lead) surface-mount package and supplied in Tape & Reel packaging. The device operates at up to 4 MHz clock speed from a 5 V supply, features an external oscillator interface, and is specified for the -40C to +125C extended industrial temperature range as denoted by the "E" speed/temperature designator. An 8-bit OTP microcontroller is a single-chip computer built around an 8-bit data path and a Harvard architecture with separate program and data memories. OTP (One-Time Programmable) EPROM is a non-volatile memory that can be written once using an EPROM programmer and exposed UV light, then retains its contents without power. Within the broader taxonomy, this part sits as: PIC16C64AT-04E/L -> PIC16C64A -> PIC16C6X family -> PIC16 -> 8-bit PIC microcontroller -> microcontroller (MCU) -> embedded processor -> semiconductor. OTP microcontrollers are positioned between mask-ROM MCUs (lowest cost at high volume) and Flash MCUs (reprogrammable, higher per-unit cost), making them well suited for low-to-medium volume production where code changes between builds are not required. Key features include 35 single-word instructions, single-cycle execution for most instructions (branches are two-cycle), a 14-bit instruction word, and a peripheral set typical of the PIC16C6X series: timers, a synchronous serial port (SSP) module, USART, capture/compare/PWM, and analog and digital I/O. The PIC16C64AT-04E/L is rated for 4 MHz maximum clock frequency, supports DC to 4 MHz operating speed, and operates from a single 5 V supply. The 33 I/O pins provide ample digital connectivity for keypad scanning, LED driving, and parallel bus interfaces in cost-sensitive embedded designs. From an architectural standpoint, the PIC16C64A uses a RISC core with a 14-bit-wide program memory bus and an 8-bit-wide data memory bus, allowing instruction fetch and data access in a single machine cycle for most opcodes. The integrated peripheral set mirrors the earlier PIC16C64 with added enhancements, and the OTP EPROM window package variant (JW) supports prototype and low-volume debugging via UV erasure. CMOS static design means clock can be stopped without losing register state, simplifying power-managed designs. Typical applications include industrial control panels, appliance control boards, automotive body electronics (pre-CAN modules), HVAC controllers, security keypads, and simple sensor interfaces where fixed firmware and cost-sensitive BOMs are priorities over Flash-based reprogrammability. The 44-pin PLCC package remains common in legacy industrial equipment where socketed replacement simplifies field service. When designing with this part, note that OTP parts cannot be reprogrammed in-circuit; firmware must be fully validated on a JW (windowed) or Flash equivalent before committing to production. Verify oscillator loading capacitors against the chosen crystal and ensure adequate decoupling on VDD/SS to suppress digital switching noise on adjacent analog sections. This page synthesizes distributor pricing, drop-in PIC16C64A family alternatives, and practical design notes beyond the manufacturer datasheet to support sourcing and engineering decisions for legacy and new designs.

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PIC16C64AT-04E/PQ - 8-Bit 4MHz OTP MCU 3.5KB Flash | Microchip
PIC16C64AT-04E/PQ

PIC16C64AT-04E/PQ - 8-Bit 4MHz OTP MCU 3.5KB Flash | Microchip

The Microchip Technology PIC16C64AT-04E/PQ is an 8-bit CMOS RISC microcontroller from the PIC® 16C family, featuring 3.5KB (2K x 14) of One-Time Programmable (OTP) program memory, 128 bytes of RAM, and 33 digital I/O pins in a 44-pin MQFP (10x10 mm) surface-mount form factor. Operating at a maximum clock speed of 4 MHz from a 5V supply, this device is housed in package variant "PQ" (MQFP-44) and is specified for the extended industrial temperature range (-40C to +125C), as indicated by the "E" designator in the part number suffix. What is an OTP microcontroller? An OTP (One-Time Programmable) microcontroller is a non-volatile programmable logic device whose on-chip program memory can be written only once after manufacture, typically using an EPROM cell. Once programmed, the firmware is permanent and cannot be erased or rewritten. OTP microcontrollers sit within the broader hierarchy of microcontrollers -> embedded microcontrollers -> 8-bit microcontrollers -> programmable logic devices -> semiconductors. They are commonly used in cost-sensitive, high-volume products where the firmware is finalized before production runs and the lowest unit cost is mandatory. Key differentiating specifications of the PIC16C64AT-04E/PQ include its 4 MHz maximum operating frequency, 35 single-word RISC instructions, 8-bit architecture with Harvard memory organization, two 8-bit timers plus one 16-bit timer, a 10-bit ADC with up to 8 channels, synchronous serial port (SSP) for SPI/I2C communication, and 33 digital I/O lines supporting direct LED drive. The PIC16C64A core implements a 14-bit instruction word with an 8-bit data path and a hardware stack depth of 8 levels, which is typical of the mid-range PIC16 family. Architecturally, the PIC16C64A family uses a RISC pipelined Harvard architecture that achieves near single-cycle instruction execution except for program branches, which are two-cycle. The OTP program memory stores the application firmware in 2K words of 14-bit width, while 128 bytes of general-purpose RAM support data and stack use. Integrated brown-out reset, power-on reset, watchdog timer, and an analog comparator make the device self-sufficient for many embedded designs without external supervisory ICs. Typical applications for the PIC16C64AT-04E/PQ include industrial control systems, appliance controllers, automotive body electronics (with appropriate qualification), low-cost sensor interfaces, LED display drivers, and any high-volume consumer product where OTP programming economics favor one-time code storage over flash-based reprogrammability. Designers often choose this part for legacy designs originally specified around the PIC16C64A family and need a known pin-compatible MCU for production continuity. A key design consideration when selecting the PIC16C64AT-04E/PQ is the OTP memory constraint: firmware bugs cannot be patched in the field, so code must be fully validated before programming. Developers should use the JW (windowed) or flash-based equivalent (e.g. PIC16F877A) variants for prototyping, then transition to the OTP or QTP parts for production. The extended (-40C to +125C) temperature range suits automotive underhood and industrial environments. This page synthesizes distributor stock data, parametric cross-references, drop-in alternatives from the same PIC16C64A family, and practical design guidance not aggregated in any single source.

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PIC16C64AT-04E/PT - 8-Bit OTP MCU, 3.5KB, 4MHz, 44-TQFP
PIC16C64AT-04E/PT

PIC16C64AT-04E/PT - 8-Bit OTP MCU, 3.5KB, 4MHz, 44-TQFP

The Microchip Technology PIC16C64AT-04E/PT is an 8-bit CMOS RISC microcontroller from the PIC16CXX family, offering 3.5KB of One-Time Programmable (OTP) program memory organized as 2K x 14 words and 128 bytes of RAM. Operating at up to 4MHz, it is housed in a 44-lead Thin Quad Flat Pack (TQFP) package supplied on tape and reel. The device provides 33 digital I/O lines, integrating peripherals including timers, a synchronous serial port (SSP), and capture/compare/PWM modules. A microcontroller (MCU) is a single-chip computer containing a processor core, program memory, working RAM, and peripheral interfaces. The PIC16C family belongs to the broader 8-bit MCU category, sitting within the embedded controller taxonomy: 8-bit MCU -> RISC microcontroller -> embedded controller -> semiconductor IC. The RISC Harvard architecture separates program and data buses, enabling single-cycle instruction execution except for branches, and the OTP program memory allows one-time factory or in-circuit programming using standard PIC development tools. Key features include 4MHz maximum clock, 33 I/O pins multiplexed across multiple peripheral functions, an external oscillator interface for crystal or resonator-based clocks, and CMOS technology for low power consumption. The wide 33-pin GPIO count, combined with on-chip peripherals, eliminates the need for external logic in many embedded designs. The 44-TQFP package offers a low-profile surface-mount footprint approximately 10x10mm, suitable for production assemblies with automated pick-and-place tooling. Typical applications include industrial control systems, automotive body electronics, consumer appliances, and general-purpose embedded control boards. The 4MHz speed and 3.5KB OTP memory suit cost-sensitive, fixed-function products where firmware is finalized at production time. The 33 I/O lines enable direct interfacing of keypads, displays, sensors, and actuators without external expanders. When designing with this device, verify that OTP programming timing and tooling match the production schedule, since OTP cannot be reprogrammed or field-updated. Plan firmware revision strategy carefully, as field bugs require physical part replacement. Adequate decoupling (100nF + 10uF) near VDD is required, and unused I/O should be configured as outputs low to minimize current draw. This page synthesizes distributor pricing, drop-in alternatives sourced from Microchip's PIC16C64A family, comparison data, and practical design notes that go beyond the manufacturer datasheet to support sourcing and engineering decisions.

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PIC16C64AT-04I/L - 4MHz 8-bit OTP MCU 3.5KB | Microchip PLCC-44
PIC16C64AT-04I/L

PIC16C64AT-04I/L - 4MHz 8-bit OTP MCU 3.5KB | Microchip PLCC-44

The Microchip Technology PIC16C64AT-04I/L is a member of the PIC16CXX family of low-cost, high-performance, CMOS, fully-static 8-bit microcontrollers, featuring 3.5KB of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 33 digital I/O lines in a 44-pin PLCC (Leaded Chip Carrier) package. The device operates from a 4V to 5.5V supply and runs up to 4MHz external clock, with all instructions executing in a single cycle except program branches which take two cycles. An 8-bit microcontroller (MCU) is a programmable integrated circuit that combines a CPU, RAM, program memory, and peripherals on a single die. MCUs are classified by bit-width, memory type, and architectural family; the PIC16CXX belongs to the classic PIC mid-range family, a Harvard RISC architecture that emphasizes deterministic instruction timing, low power, and a compact 35-instruction instruction set. The OTP memory flavor means the part is programmed once and is typically used in production runs where firmware is finalized and stable. Key features include a high-performance RISC CPU with only 35 single-word instructions to learn, DC to 4MHz clock input, 33 I/O pins with individual direction control, programmable code protection, power-on reset, watchdog timer with on-chip RC oscillator, and an industrial temperature range of -40C to +85C. The device also integrates a 14-bit instruction word with 8-bit data path, hardware stack, and multiple timer/counter modules suitable for embedded control tasks. The PIC16C64A architecture uses a modified Harvard design with separate program and data buses, allowing instruction fetch and operand read to occur in the same cycle. The OTP EPROM cell enables windowed programming for prototyping with UV erasure, while the industrial-grade ceramic windowed CDIP variant exists for development and engineering samples. The PLCC-44 footprint is well-suited for socketed programming and rework in legacy industrial designs. Typical applications include industrial automation controllers, HVAC fan and pump controls, appliance control boards, security and access control panels, and automotive body electronics (non-safety). The 33 I/O count and 128-byte RAM make it suitable for keypad scanning, LED or relay driving, and UART-based communication in mid-complexity embedded designs. When designing with this part, ensure the 4V-5.5V supply is well regulated, leave unused I/O pins configured as outputs and tied low to minimize current consumption, and use the watchdog timer for reliable recovery from software lockups. The OTP memory cannot be reprogrammed in-circuit; a Flash-based PIC16F equivalent is recommended for prototypes requiring iterative firmware updates. This page synthesizes distributor pricing, drop-in alternatives in the same PLCC-44 footprint, and practical design notes that go beyond the manufacturer datasheet.

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PIC16C64AT-04I/PQ - 8-Bit 4MHz OTP MCU, 44-MQFP | Microchip
PIC16C64AT-04I/PQ

PIC16C64AT-04I/PQ - 8-Bit 4MHz OTP MCU, 44-MQFP | Microchip

The Microchip Technology PIC16C64AT-04I/PQ is a member of the PIC16C family of 8-bit CMOS RISC microcontrollers featuring 3.5KB of One-Time Programmable (OTP) program memory and 128 bytes of RAM, housed in a 44-pin Metric Quad Flat Pack (MQFP, 10x10 mm) package. It operates at up to 4MHz from a 5V supply and provides 33 digital I/O pins. The PIC16C64A series is a classic mid-range PIC microcontroller aimed at embedded control in cost-sensitive and space-constrained applications. Background: 8-bit microcontrollers (MCUs) are single-chip computers integrating a CPU core, program memory, data RAM, peripherals, and I/O on a single die. The PIC16C family uses Microchip's enhanced Harvard RISC architecture, which separates program and data buses to allow simultaneous fetch and execute, yielding deterministic instruction timing. The PIC16C64A belongs to the mid-range PIC family (14-bit instruction word), and OTP variants are programmed once at production and cannot be erased, which keeps unit cost low for high-volume embedded products. Key features include a RISC instruction set with only 35 single-word instructions, 14-bit wide program memory, 8-bit data path, programmable code protection, a Watchdog Timer with its own on-chip RC oscillator, power-saving SLEEP mode, and three hardware timers (Timer0, Timer1, Timer2). It also integrates a Universal Synchronous Asynchronous Receiver Transmitter (USART) for serial communications. Industrial-grade -40C to +85C operating temperature (I-grade) makes the part suitable for harsh environments. The architecture uses a 14-bit program counter that can address up to 8K x 14 words of program memory. The ALU is 8-bit wide and operates on a working register (W) and the data memory. Brown-out Reset, Power-on Reset, and a programmable code-protect bit are also integrated. Typical applications include industrial control (sensor interfacing, motor control, lighting controllers), automotive body electronics (climate controls, instrument clusters), consumer appliances (washing machines, microwave ovens), and general-purpose embedded systems (keypad scanners, smart sensors, security panels) where a low-cost, low-pin-count controller suffices. When designing with the PIC16C64AT-04I/PQ, plan for an OTP programming step during manufacturing (no field re-programmability). Ensure a stable 5V supply, a decoupling capacitor close to VDD/VSS, and observe the in-circuit serial programming (ICSP) pinout if field upgrade or factory programming is needed. For new designs consider PIC16F variants for Flash reprogrammability. This page synthesizes real distributor pricing, drop-in alternative cross-references and practical design notes that the manufacturer datasheet does not consolidate.

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PIC16C64AT-10/PT - 8-Bit 10MHz OTP MCU 44-TQFP | Microchip
PIC16C64AT-10/PT

PIC16C64AT-10/PT - 8-Bit 10MHz OTP MCU 44-TQFP | Microchip

The Microchip Technology PIC16C64AT-10/PT is a member of the PIC® 16C family of 8-bit CMOS microcontrollers, offering 3.5KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 33 digital I/O pins in a 44-pin TQFP (10x10 mm) package. It runs at a maximum clock speed of 10 MHz with a 200 ns instruction cycle and operates across 2.5V to 6.0V supply voltage, consuming a typical 2 mA operating current at 5V/4 MHz. An 8-bit microcontroller (MCU) is a single-chip computer with an 8-bit data bus, ALU, program counter, and integrated peripherals designed for embedded control. The PIC16CXX line is the classic mid-range RISC family from Microchip: low-cost, high-performance, fully-static CMOS cores positioned above the 12C/16C baseline and below the enhanced 16F mid-range and 18F lines in capability, but valued for deterministic timing, OTP/EPROM code storage for high-volume fixed-function products, and an extensive ecosystem of C compilers and debug tools. Key features include an 8-level hardware stack, 14-bit instruction width, 35 single-word instructions (only one two-cycle branch instruction), two 8-bit timers (Timer0, Timer2) and one 16-bit timer (Timer1), a Capture/Compare/PWM (CCP) module, synchronous and USART serial ports, an 8-bit parallel slave port, watchdog timer with on-chip RC oscillator, and brown-out reset. The 33 I/O pins feature individual direction control and support high-current sink/source (25 mA sink, 20 mA source) for direct LED or relay drive. Architecturally, the PIC16C64A uses a Harvard architecture with separate program and data buses, an 8-bit ALU, and a 14-bit program word width. This separation eliminates bus contention and supports single-cycle instruction execution except for program branches. The OTP memory integrates UV-erasable EPROM cells, making the device suited for volume production runs of stable firmware. Typical applications include industrial control and motor drive, automotive body electronics, security and access control, HVAC control, washing machine and white-goods controllers, and any cost-sensitive embedded system with stable code. When designing with this part, plan VDD/VSS decoupling (0.1 µF minimum close to the pins), oscillator layout per Microchip AN588, and verify the OTP programming timing against your programmer's in-circuit or socketed programming strategy before high-volume ramp.

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PIC16C64AT-10E/L - 8-bit OTP MCU 3.5KB 33 I/O | Microchip
PIC16C64AT-10E/L

PIC16C64AT-10E/L - 8-bit OTP MCU 3.5KB 33 I/O | Microchip

The Microchip Technology PIC16C64AT-10E/L is a member of the PIC16C6X family of low-cost, high-performance CMOS fully-static 8-bit microcontrollers, offered in a 44-pin PLCC (J-lead) package with 3.5KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 33 digital I/O pins. The "-10E" suffix denotes a 10 MHz maximum clock input and the "E" extended industrial temperature grade (-40C to +125C), with the "T" indicating tape-and-reel packaging for high-volume SMT assembly. Operating from a single 2.5V to 6.0V supply, the PIC16C64A core uses a RISC architecture with only 35 single-word instructions, all executing in a single instruction cycle except program branches, which take two cycles. An 8-bit microcontroller (MCU) is a single-chip computer integrating an 8-bit CPU, program memory (ROM/EPROM/Flash/OTP), data RAM, peripheral set, and I/O into one package. Within the broader classification, the PIC16C64A sits in the OTP microcontroller category -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. The PIC16CXX family uses a Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and data access. Key features of the PIC16C64AT-10E/L include: an integrated Synchronous Serial Port (SSP) for SPI and I2C communication, a USART for asynchronous serial links, three hardware timers (Timer0, Timer1, Timer2), an 8-bit ADC with 8 channels, a watchdog timer with its own on-chip RC oscillator for reliable operation, and dual analog comparators. The 33 I/O pins are organized across multiple ports (PORTA through PORTE) capable of directly driving LEDs and providing edge-triggered interrupts. The PIC16C64A core is built on a low-power CMOS process that supports DC to 10 MHz clock operation (DC meaning the clock can be slowed to any frequency including DC for step-by-step debugging). Power-saving SLEEP mode reduces current draw to the microamp range while retaining RAM, and the device supports in-circuit serial programming for production-friendly firmware updates. The architecture includes a hardware multiply assist in the form of bit-manipulation instructions, enabling efficient boolean logic in control applications. Typical applications include industrial control systems, automotive body electronics, appliance controllers, sensor interface boards, and embedded instrumentation. The combination of 3.5KB OTP, 128 bytes RAM, and 33 I/O lines is well matched to mid-range control loops such as HVAC actuators, motor-control BLDC/PMSM drivers, and point-of-sale terminals. The extended temperature grade (-E) supports harsh-environment deployments like under-hood automotive or factory-floor equipment. When designing with the PIC16C64AT-10E/L, note that the part is OTP - the program memory can be written only once and cannot be erased. For prototyping or frequent firmware updates, consider a Flash-based sibling such as the PIC16F877A or PIC16F74. Decoupling: place a 100 nF ceramic capacitor as close as possible to the VDD pin, plus a 10 uF bulk capacitor near the regulator output. This page synthesizes distributor pricing, drop-in alternative cross-references, and practical design notes not aggregated in a single datasheet location - information gain beyond what the Microchip datasheet alone provides.

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PIC16C64AT-10E/PQ - 10MHz 8-Bit OTP MCU, 3.5KB | Microchip
PIC16C64AT-10E/PQ

PIC16C64AT-10E/PQ - 10MHz 8-Bit OTP MCU, 3.5KB | Microchip

The Microchip Technology PIC16C64AT-10E/PQ is an 8-bit RISC CMOS microcontroller from the PIC® 16C family, offering 3.5KB of one-time programmable (OTP) program memory organized as 2K x 14 words, 128 bytes of data RAM, and 33 general-purpose I/O lines in a 44-pin MQFP (PQ) package. The device operates at a maximum clock frequency of 10 MHz from a 5V supply and is qualified for the extended industrial temperature range. An 8-bit microcontroller (MCU) is a single-chip processor that integrates a CPU, memory (program + data), and configurable I/O on a single die, intended for embedded control tasks where deterministic, low-power operation matters more than raw compute throughput. Within the broader taxonomy, the PIC16C64A belongs to the PIC16 family of mid-range microcontrollers, which sits under the PIC microcontrollers family, microcontrollers (MCU) category, and ultimately the integrated circuits (IC) and semiconductor hierarchies. The mid-range core uses a 14-bit instruction word and Harvard architecture, separating program and data buses for predictable interrupt response. Key features include the 10 MHz maximum clock rate, 33 I/O pins with individually configurable direction, an integrated 8-bit timer/counter (TMR0) with 8-bit prescaler, a 16-bit timer/counter (TMR1), a watchdog timer for reliable recovery from code faults, and brown-out reset support on common microcontroller architectures of the era. The OTP program memory supports one-time programming, which is well suited to production programming after code freeze, lowering per-unit cost versus ceramic windowed EPROM variants. The 'T' suffix indicates tape-and-reel packaging, while the 'E' denotes the extended temperature grade. The PIC16C64A uses a RISC instruction set with only 35 single-word instructions, simplifying compiler output and accelerating firmware development in C or assembly. Built around CMOS static logic, the device enters a low-power sleep mode with oscillator halted, ideal for battery-fed or power-budgeted industrial applications. Memory organization maps 128 bytes of data RAM and supports indirect addressing through FSR/INDF for pointer-based data structures. Typical applications include industrial control and sensor interfaces, automotive body and chassis subsystems, white-goods and appliance controllers, low-cost data acquisition front-ends, and replacement of discrete logic on legacy boards. The 33 I/O count enables direct drive of keypads, LED arrays, and parallel peripherals without external expanders. When designing with this part, note that OTP memory cannot be re-programmed - code must be verified before programming. Add a 100 nF decoupling capacitor adjacent to each VDD pin and route the MCLR reset line carefully to avoid false resets in electrically noisy industrial environments. This page consolidates distributor pricing, parametric cross-reference data, and practical design notes that complement the manufacturer datasheet, providing actionable engineering context for procurement and design engineers.

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PIC16C64AT-10E/PT - 3.5KB OTP 8-bit MCU, 10MHz, 44-TQFP
PIC16C64AT-10E/PT

PIC16C64AT-10E/PT - 3.5KB OTP 8-bit MCU, 10MHz, 44-TQFP

The Microchip PIC16C64AT-10E/PT is an 8-bit RISC microcontroller in the PIC16C family, featuring 3.5KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of SRAM, and 33 general-purpose digital I/O pins, housed in a 44-pin TQFP (PT) surface-mount package. The 'T' suffix denotes tape-and-reel packaging, while '10E' indicates a 10 MHz maximum clock speed with the extended (-40C to +125C) operating temperature grade. The device uses an external oscillator and targets applications requiring deterministic real-time control with a small memory footprint. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/OTP/Flash), data RAM, I/O peripherals, and timers onto one die. PIC microcontrollers use a Harvard architecture with separate program and data buses, enabling single-cycle instruction execution for most opcodes. The PIC16C64A specifically belongs to the mid-range PIC family, sitting between the baseline PIC16C5x and the high-end PIC17C/PIC18C families. OTP memory allows the device to be programmed once at production, balancing per-unit cost against reprogrammability, making it suitable for mature, stable-volume embedded products rather than development or field-upgradable systems. Key features of the PIC16C64AT-10E/PT include a 14-bit instruction word with 35 single-word instructions, a hardware multiplier-free RISC core, and integrated peripherals such as timers, a synchronous serial port (SSP), and a capture/compare/PWM module. The device operates from a wide 2.5V to 6.0V supply range, with low-power sleep and watchdog timer support for battery-friendly operation. The extended temperature grade (-40C to +125C) allows deployment in industrial and automotive under-hood environments. Architecturally, the PIC16C64A uses a 14-bit program counter to address 8K x 14 of program space (with only the first 2K implemented on the '64A variant), an 8-level hardware stack for subroutine nesting, and direct/indirect/inherent addressing modes. The SSP module supports SPI and I2C master/slave modes, simplifying connectivity to serial EEPROMs, sensors, and display drivers. The 33 I/O pins are organized into multiple ports with individually programmable direction and weak pull-up registers. Typical applications include industrial control systems, HVAC thermostats, security alarm panels, simple sensor hubs, automotive body electronics, and white-goods appliance controllers. The wide operating voltage and extended temperature range make it well suited for harsh environments, while the OTP memory reduces per-unit cost in high-volume production. Designers should pair it with an external resonator or crystal oscillator and provide adequate decoupling on VDD pins per Microchip's recommended layout guidelines.

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PIC16C64AT-10I/L - 8-Bit 10MHz OTP MCU 3.5KB 44-PLCC | Microchip
PIC16C64AT-10I/L

PIC16C64AT-10I/L - 8-Bit 10MHz OTP MCU 3.5KB 44-PLCC | Microchip

The Microchip Technology PIC16C64AT-10I/L is an 8-bit RISC microcontroller from the PIC® 16C family, featuring a 10 MHz core clock speed, 3.5KB (2K x 14) of One-Time Programmable (OTP) program memory, and 128 bytes of RAM, housed in a 44-pin PLCC (QCCJ) package. The "T" suffix indicates tape-and-reel packaging, "10" denotes the 10 MHz maximum operating frequency, "I" indicates the industrial temperature grade, and "/L" specifies the 44-lead PLCC (J-lead) form factor. A PIC16C-series microcontroller is a member of the Microchip 8-bit CMOS RISC family that executes most instructions in a single cycle, providing deterministic timing and high code density. These microcontrollers sit within the broader hierarchy of microcontroller -> embedded controller -> semiconductor device, and are designed for cost-sensitive, deterministic control applications where legacy code bases or simple peripheral integration are priorities. Key features of the PIC16C64AT-10I/L include 33 digital I/O pins, an integrated analog comparator, a watchdog timer, and support for both parallel and serial programming of the OTP memory. The Harvard architecture separates program and data buses, enabling simultaneous instruction fetch and data access, while the RISC instruction set of 35 single-word instructions reduces learning curve and code overhead. The device uses CMOS technology and is fully static, allowing the clock to be stopped without losing internal state. Operating voltage typically ranges from 4.0V to 6.0V, with low-power sleep mode support. The 44-pin PLCC package provides mechanical robustness for through-hole and socket-based prototyping while remaining compatible with surface-mount assembly when used with PLCC sockets. Typical applications include industrial control systems, motor control interfaces, sensor signal conditioning, legacy embedded products, and prototyping platforms where the OTP memory offers cost advantages over flash-based alternatives. The wide I/O count makes it suitable for keypad scanning, LED display driving, and parallel peripheral interfacing. When designing with this part, note that OTP memory cannot be erased or reprogrammed, so firmware must be fully validated before programming. Consider migration paths to flash-based PIC16F equivalents (e.g., PIC16F77) for new designs where in-circuit reprogrammability reduces development cycle time. This page synthesizes distributor pricing, verified alternatives in the same 44-PLCC package, and practical design notes for engineers evaluating or maintaining legacy designs based on the PIC16C64A family.

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PIC16C64AT-10I/PQ - 8-Bit PIC MCU 3.5KB OTP 33 I/O | Microchip
PIC16C64AT-10I/PQ

PIC16C64AT-10I/PQ - 8-Bit PIC MCU 3.5KB OTP 33 I/O | Microchip

The Microchip Technology PIC16C64AT-10I/PQ is an 8-bit RISC CMOS microcontroller in the PIC16C6X family, offering 3.5KB of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 33 digital I/O pins in a 44-pin MQFP (PQ) surface-mount package. It operates up to 10 MHz from a 5 V supply and is rated for the industrial -40C to +85C temperature range. What is a PIC16C64A? The PIC16C64A belongs to the PIC16C6X mid-range family of 8-bit microcontrollers, descended from the original PIC16C5X baseline. These MCUs use a RISC (Reduced Instruction Set Computer) architecture with only 35 single-word instructions to learn, where most instructions execute in one instruction cycle. As a Harvard-architecture device, the PIC16C64A has separate program and data buses, allowing simultaneous instruction fetch and data access. It sits in the microcontroller hierarchy as: microcontroller -> embedded controller -> 8-bit MCU -> PIC mid-range -> PIC16C6X family. Key features of the PIC16C64AT-10I/PQ include a 10 MHz maximum clock, 200 ns instruction cycle, three hardware timers (Timer0, Timer1, Timer2), a USART module for asynchronous serial communication, and a parallel slave port. The T suffix denotes tape-and-reel packaging, while I specifies the industrial temperature grade. The PQ suffix indicates the 44-pin Metric Quad Flat Pack (MQFP) gull-wing surface-mount package. This device uses EPROM/OTP program memory rather than Flash, meaning code is written once and cannot be electrically erased. This makes the part well suited for high-volume production where firmware is finalized, but limits prototyping use compared to Flash-based PIC16F equivalents. CMOS technology provides low power consumption with typical applications drawing only a few milliamps. Typical applications include industrial control systems, motor drive front-ends, sensor interfacing, automotive body electronics, and embedded control panels where a 5 V-tolerant interface to external peripherals is required. The 33 I/O pins comfortably drive keypads, LED arrays, LCD modules, and small relay or solenoid loads. When designing with this part, note that OTP memory precludes in-system firmware updates. For development, engineers should prototype on a Flash-equipped sibling (PIC16F64A-equivalent or PIC18 baseline) and migrate to the OTP PIC16C64A once firmware is frozen. This page synthesizes distributor pricing, datasheet specifications, and drop-in alternatives from the same PIC16C6X family, providing practical context not duplicated on manufacturer product pages.

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PIC16C64AT-20/L - 8-Bit 20MHz OTP MCU, 3.5KB | Microchip
PIC16C64AT-20/L

PIC16C64AT-20/L - 8-Bit 20MHz OTP MCU, 3.5KB | Microchip

The Microchip Technology PIC16C64AT-20/L is an 8-bit RISC microcontroller from the PIC® 16C family, featuring a 20 MHz maximum clock, 3.5 KB (2K x 14) of One-Time Programmable (OTP) program memory and 128 bytes of RAM, housed in a 44-pin PLCC (J-Lead) package with a 16.59 mm x 16.59 mm body. The “T” suffix denotes tape-and-reel packaging and the “-20” suffix indicates a 20 MHz maximum operating frequency. What is a PIC16C OTP microcontroller? A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and peripheral interfaces. The PIC16C family uses a Harvard-architecture RISC core that executes most instructions in a single clock cycle, making it well suited to real-time control. The “C” suffix denotes CMOS EPROM/OTP program memory - non-volatile, but write-once. Within the broader taxonomy, the PIC16C64A sits in this hierarchy: 8-bit MCU -> PIC16 family -> PIC16C6x sub-family -> PIC16C16C64A device -> OTP CMOS implementation. Key features of the PIC16C64A include 33 I/O pins, three timer modules, a Capture/Compare/PWM (CCP) module, an 8-bit parallel slave port, and serial interfaces (SSP) that support both SPI and I²C. The device integrates power-on reset (POR), brown-out detect/reset (BOR), a watchdog timer (WDT) with its own on-chip RC oscillator, and a programmable code-protection fuse. Operating voltage spans 3.0 V to 5.5 V across the commercial 0 °C to +70 °C range, with industrial -40 °C to +85 °C variants available under different temperature suffixes. Architecturally, the PIC16C64A uses a 14-bit instruction word and an 8-bit data path, allowing compact code density while keeping peripherals register-mapped. The 8-level hardware stack and 35-instruction set simplify assembly or C programming, and the CCP module provides PWM outputs for motor or LED control. The parallel slave port lets the device interface directly to an external 8-bit host bus, while the SSP peripheral supports both SPI and I²C master/slave modes. Typical applications include industrial control panels, motor drive front-ends, embedded sensor hubs, and legacy upgrade / EOL replacement designs where a proven PIC16C6x footprint and toolchain are required. The PIC16C64AT-20/L is also widely used in educational and prototyping environments that target the PIC16C instruction set. When designing with this part, verify that OTP programming is appropriate for the production volume - flashed (F-series) PIC16F variants are typically lower cost per unit and re-programmable. Confirm the 5V supply rail tolerance for analog peripherals and ensure the parallel slave port pin direction registers are correctly initialised in firmware. This page synthesises distributor pricing, verified drop-in alternatives from the PIC16C6x family, and practical design notes that go beyond what the manufacturer datasheet alone provides.

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PIC16C64AT-20/PQ - 8-Bit 20MHz OTP MCU 3.5KB | Microchip
PIC16C64AT-20/PQ

PIC16C64AT-20/PQ - 8-Bit 20MHz OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16C64AT-20/PQ is an 8-bit CMOS RISC microcontroller belonging to the PIC16C family, operating at up to 20 MHz clock speed and housed in a 44-pin MQFP (10x10 mm) surface-mount package with gull-wing leads. The device integrates 3.5 KB (2K x 14) of one-time programmable (OTP) program memory and 128 bytes of RAM, with 33 digital I/O pins and a 5V nominal supply. According to the PIC16C6X family datasheet, this part is well suited for embedded control applications requiring deterministic execution and a small instruction set. An 8-bit microcontroller (MCU) is a single-chip processor that integrates CPU core, program memory, working RAM, and peripheral interfaces on one die. PIC microcontrollers use a Harvard RISC architecture that decouples program and data buses, executes one instruction per clock cycle (except branches), and supports only 35 single-word instructions. Within the broader taxonomy, the PIC16C64A sits between 8-bit MCUs and the wider PIC16 mid-range family, which itself belongs to the microcontroller hierarchy of the semiconductor category. Key features of the PIC16C64AT-20/PQ include a 200 ns instruction cycle at 20 MHz, two 8-bit and one 16-bit timer/counter, a synchronous serial port (SSP) supporting SPI and I2C, a parallel slave port, and a USART. The 33 I/O pins can drive source/sink currents up to 25 mA per pin, simplifying direct interface to relays, LEDs, and bipolar transistors. The OTP program memory allows low-cost prototyping with stable firmware retention, while the 14-bit instruction word supports immediate and literal operations. Architecturally, the PIC16C64A uses a 14-bit program word and an 8-bit data path, with an 8-level hardware stack for subroutine calls and a programmable watchdog timer for safe recovery from code lockups. The MQFP-44 package offers ample I/O for motor, display, and instrumentation applications, while commercial temperature grade (0 °C to +70 °C) targets consumer and industrial environments. The 'T' suffix denotes tape-and-reel packaging for high-volume assembly, and the 'PQ' package code designates the plastic MQFP form factor. Typical applications include motor control, industrial automation, HVAC controllers, security and access systems, and instrumentation front-ends. The deterministic instruction timing makes the part effective for closed-loop control where predictable interrupt latency is required. When designing with this device, plan for an external oscillator (crystal or resonator) since no internal RC is provided on the PIC16C64A, and ensure the brown-out reset configuration matches the application supply profile. The OTP memory requires pre-programming before PCB assembly for production units. This page synthesizes current distributor pricing, parametric drop-in alternatives from the same PIC16C family, and practical design notes not found in the standalone datasheet.

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PIC16C64AT-20E/PQ - 8-Bit 20MHz OTP MCU, 3.5KB | Microchip
PIC16C64AT-20E/PQ

PIC16C64AT-20E/PQ - 8-Bit 20MHz OTP MCU, 3.5KB | Microchip

The Microchip Technology PIC16C64AT-20E/PQ is a member of the PIC16CXX family of low-cost, high-performance, CMOS, fully-static, 8-bit microcontrollers. The device operates at up to 20MHz clock speed, integrates 3.5KB (2K x 14) of One-Time Programmable (OTP) program memory, 128 x 8 bytes of RAM, and is housed in a 44-pin MQFP (10x10 mm) surface-mount package supplied on Tape & Reel. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, RAM, and programmable I/O peripherals. Within the broader taxonomy, the PIC16C64A is an OTP variant of the PIC16C64 baseline - OTP devices are programmed once and cannot be erased, contrasting with UV-erasable EPROM and Flash (PIC16F) siblings. PIC microcontrollers sit in the 8-bit RISC category alongside the 8051 and AVR families, and serve as the lowest-cost general-purpose embedded controllers in the Microchip portfolio. Key features of the PIC16C64AT-20E/PQ include the Harvard RISC architecture with separate program and data buses, 33 digital I/O lines, a 20MHz internal oscillator input, capture/compare/PWM (CCP) module, USART, 8-channel 8-bit A/D converter, three timers, and an instruction set of 35 single-word instructions. The 'E' suffix designates the extended industrial temperature range of -40C to +125C, and the 'T' suffix denotes Tape & Reel packaging. The device is well suited to industrial control, automotive subsystem, and consumer product applications where cost-sensitive, deterministic 8-bit control is required. The PIC16C64AT-20E/PQ is built on Microchip's mature CMOS process and uses a 14-bit instruction word with a 12-bit program memory address space, supporting 8K x 14 of addressable program memory. Its Harvard architecture allows simultaneous instruction fetch and data access, enabling most instructions to execute in a single instruction cycle (200ns at 20MHz). Power consumption is optimized through SLEEP mode and a programmable Watchdog Timer, making it suitable for battery-powered or low-duty-cycle embedded designs. Typical applications include industrial control, automotive body and chassis electronics, consumer appliances, and general-purpose embedded control systems. The 33 I/O pins and integrated peripherals allow the device to replace multiple discrete logic ICs in cost-sensitive designs.

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PIC16C64AT-20E/PT - 8-bit OTP MCU, 20MHz, 44-TQFP | Microchip
PIC16C64AT-20E/PT

PIC16C64AT-20E/PT - 8-bit OTP MCU, 20MHz, 44-TQFP | Microchip

The Microchip Technology PIC16C64AT-20E/PT is an 8-bit CMOS microcontroller from the PIC16C family, featuring a 20 MHz maximum operating frequency, 3.5 KB (2K x 14) of One-Time-Programmable (OTP) program memory, and 128 bytes of RAM, housed in a 44-pin TQFP (10x10 mm) surface-mount package. The device integrates 33 digital I/O pins, two 8-bit and one 16-bit timer/counter modules, a 10-bit multi-channel Analog-to-Digital Converter, and serial connectivity through I2C and SPI peripherals, making it a versatile general-purpose embedded controller. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces on one die, enabling compact, low-power embedded designs. PIC16C-series OTP MCUs belong to the broader 8-bit microcontroller category, sitting hierarchically above general-purpose microcontrollers, microcontrollers, and semiconductor integrated circuits. They are characterized by a RISC-based Harvard architecture with separate program and data buses, deterministic interrupt latency, and OTP ROM for code storage in cost-sensitive or short-run production. Key features of the PIC16C64AT-20E/PT include a wide operating voltage range of 2.5 V to 6.0 V, brown-out detect and reset (BOD/BOR) for safe power-up behavior, a power-on reset (POR) circuit, a watchdog timer (WDT) for runaway code recovery, and pulse-width modulation (PWM) outputs suitable for motor or lighting control. The integrated 10-bit ADC provides analog signal acquisition with up to 8 input channels, while the synchronous serial port supports both SPI and I2C master/slave protocols for sensor and peripheral expansion. Architecturally, the PIC16C64A employs a 14-bit instruction word with a single accumulator-based working register (WREG) and a small file-register map, delivering deterministic execution at 4 clock cycles per instruction (200 ns per instruction at 20 MHz). The CMOS process technology yields low power consumption suitable for battery-backed industrial control, automotive body electronics, and appliance subsystems, with sleep current low enough for long-term standby operation. Typical applications include industrial control panels, HVAC sensor interfaces, motor control boards, automotive body modules, appliance user interfaces, and general-purpose embedded controllers in the PIC16C legacy ecosystem. The 44-TQFP package supports compact, high-density PCB layouts and is compatible with standard SMT assembly lines. When designing with the PIC16C64AT-20E/PT, ensure that MCLR is properly pulled high through a resistor-capacitor network, and place decoupling capacitors (100 nF and 10 uF) close to the VDD/VSS pairs. Note that the OTP variant cannot be reprogrammed, so choose the flash-based PIC16F877A or PIC16F887 if in-system firmware updates are required.

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PIC16C64AT-20I/PQ - 8-Bit 20MHz OTP MCU, 3.5KB | Microchip
PIC16C64AT-20I/PQ

PIC16C64AT-20I/PQ - 8-Bit 20MHz OTP MCU, 3.5KB | Microchip

The Microchip Technology PIC16C64AT-20I/PQ is an 8-bit RISC microcontroller from the PIC® 16C family with 20 MHz maximum clock speed, 3.5 KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 33 programmable I/O pins, housed in a 44-pin MQFP (10x10 mm) surface-mount package. It operates from a 4 V to 6 V supply across the industrial temperature range of -40 °C to +85 °C, supporting I2C and SPI serial communication, and is specified at 20 MHz across that full supply window. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces onto one die. The PIC16CXX family is built on a fully-static CMOS architecture with a Harvard memory layout, meaning the program and data buses are physically separate. The C family is the classic OTP lineage that preceded the Flash-based F series; OTP parts are programmed once with a device programmer and cannot be electrically erased, which suits cost-sensitive production runs. Within the power-management IC hierarchy, this part sits at the controller/signal-processing tier alongside 8-bit microcontrollers from 8051, AVR, and HC11 families. Key features include a 14-bit instruction set optimized for compact code, a hardware USART for asynchronous serial links, an 8-bit parallel slave port for bus expansion, and a programmable watchdog timer with its own on-chip RC oscillator for fail-safe operation. The 33 I/O pins are grouped into five ports (PORTA–PORTE), each capable of sourcing or sinking sufficient current to drive LEDs and small relays directly. Brown-out-reset circuitry holds the part in reset when VDD dips below a programmable threshold, preventing code corruption from indeterminate supply rails. Architecture-wise, the PIC16C64A integrates an 8-level hardware stack for subroutine nesting, a 14-bit program counter that addresses the full 8K x 14 OTP space, and an interrupt controller handling up to 12 sources including external edge-triggered events. The core executes most instructions in a single 200 ns instruction cycle at 20 MHz, delivering roughly 5 MIPS of throughput. A 5-bit port-RA multiplexed analog comparator and two analog comparators further extend the analog front-end without external ICs. Typical applications include industrial automation controllers, consumer-electronics user-interface boards, automotive body and convenience modules (with PIC16F variants recommended for new designs), appliance control panels, and remote sensor signal-conditioning front-ends. Designers continue to specify this OTP part where mature firmware is locked and per-unit cost is critical. A practical design consideration is the OTP memory: firmware must be fully validated, since field firmware updates are impossible. For new designs, consider the pin-compatible PIC16F877A (Flash) variant to gain in-circuit reprogrammability without changing the PCB layout.

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PIC16C65A-04/L - 8-bit 4MHz 7KB OTP MCU 44-PLCC | Microchip
PIC16C65A-04/L

PIC16C65A-04/L - 8-bit 4MHz 7KB OTP MCU 44-PLCC | Microchip

The Microchip Technology PIC16C65A-04/L is a member of the PIC16CXX family of low-cost, high-performance CMOS, fully-static 8-bit microcontrollers housed in a 44-pin PLCC (J-Lead) package. It integrates a 4 MHz RISC CPU core, 7 KB of One-Time-Programmable (OTP) program memory organized as 4K x 14 bits, 192 bytes of RAM, and 33 digital I/O lines. The '04' speed grade denotes a 4 MHz oscillator maximum, while the 'L' suffix indicates the PLCC lead-form. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral interfaces on one die. The PIC16C65A-04/L belongs to the 8-bit MCU -> microcontroller -> embedded controller -> semiconductor hierarchy, sitting within Microchip's classic mid-range PIC16 architecture widely used in industrial control and embedded designs. Key features include 35 single-word instructions (most executing in one instruction cycle, with branches in two), a wide operating voltage range, and low power consumption: 5 mA typical at 5 V/4 MHz and 15 uA typical at 3 V/32 kHz. The fully static design allows the clock to be stopped without losing register state, and the device supports commercial, industrial, and extended temperature ranges. The integrated peripherals include timers, an 8-bit A/D converter, USART, and capture/compare/PWM modules. Architecturally, the PIC16C65A-04/L uses a Harvard-style RISC core with separated program and data buses, enabling simultaneous instruction fetch and operand access. The 14-bit wide program memory word yields more efficient instruction encoding than 8-bit CISC cores, and the OTP EPROM process technology allows one-time factory or in-circuit programming using a standard device programmer. Typical applications include industrial automation controllers, motor control subsystems, automotive body electronics, smart sensor interfaces, and embedded data acquisition systems. The 33 I/O lines and integrated peripherals make it well suited to medium-complexity embedded designs that need deterministic real-time response. When designing with this MCU, ensure decoupling capacitors are placed within 5 mm of VDD pins and that unused I/O pins are configured as outputs to minimize current consumption. OTP parts cannot be re-programmed in-circuit; choose a flash-based PIC16F equivalent if firmware revision cycles are anticipated. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes for the PIC16C65A-04/L that are not aggregated on the manufacturer datasheet alone.

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PIC16C65A-04/P - 8-Bit 4MHz 7KB OTP MCU 40-PDIP | Microchip
PIC16C65A-04/P

PIC16C65A-04/P - 8-Bit 4MHz 7KB OTP MCU 40-PDIP | Microchip

The Microchip Technology PIC16C65A-04/P is an 8-bit CMOS microcontroller built on Microchip's PIC16 family architecture, operating at 4 MHz with 7 KB (4K x 14) of one-time-programmable (OTP) program memory in a 40-pin PDIP through-hole package. According to the Microchip datasheet, the device provides 192 bytes of RAM, 33 digital I/O lines, three timer/counter modules, two capture/compare/PWM (CCP) modules, a synchronous serial port (SSP) supporting SPI and I2C, a USART, and an 8-bit analog-to-digital converter (ADC) with up to 8 input channels. What is an OTP microcontroller? An OTP (one-time-programmable) microcontroller is a class of embedded controller in which the on-chip program memory can be written only once by the user. OTP MCUs sit in the hierarchy of microcontrollers between mask-ROM parts (factory-programmed, lowest cost at high volume) and Flash-based parts (rewritable in-circuit). Because they require no quartz window for UV erasure, OTP packages are cheaper to produce and physically smaller, which is why PIC16C65A-04/P is offered in the low-cost plastic PDIP-40 form factor. In the modern product hierarchy, OTP parts are a subset of one-time-programmable memory MCUs, which themselves sit under microcontrollers -> embedded controllers -> semiconductor ICs. Key specifications of the PIC16C65A-04/P include 4 MHz maximum clock (the -04 speed grade), 200 ns instruction cycle, 35 single-word RISC instructions, 8-level deep hardware stack, 14-bit instruction word, 8-bit data path, 8-channel 8-bit ADC, two 8-bit timers plus one 16-bit timer, USART, SSP, and two CCP modules. Power supply range is 2.5 V to 6.0 V; the device operates across commercial (0 °C to +70 °C) and industrial (-40 °C to +85 °C) temperature ranges, with typical supply current of <2 mA at 5 V / 4 MHz and less than 1 µA in sleep mode. Architecture-wise, the PIC16C65A is built on a Harvard RISC core that fetches instructions in a single cycle (except program branches, which take two cycles). This is the same family as the PIC16C66 and PIC16C67, sharing peripheral set and pinout in the 40-pin PDIP package, with the -A silicon revision adding improvements in oscillator robustness and ADC linearity versus the original PIC16C65. The -04 speed grade is the 4 MHz part, complemented by -10 (10 MHz) and -20 (20 MHz) grades in the same family. Typical applications include industrial control logic, motor drive interfacing, instrumentation front-ends, HVAC controllers, security and access panels, automotive body electronics, embedded data acquisition, and any 8-bit control loop that needs ADC, PWM, and serial communication on a single low-cost chip. The 40-pin PDIP form factor makes it convenient for through-hole prototyping, breadboarding, educational kits, and legacy maintenance designs where the same socket pattern must be preserved across product revisions. A key design consideration: because this is an OTP part, firmware bugs cannot be patched in the field - designers must validate code on a windowed (JW) or Flash sibling (PIC16F77) before committing to the OTP build. Also note the A-suffix in PIC16C65A denotes the second die revision, which has minor register differences versus the original PIC16C65 (revocation of the PCON<POR> bit and revised oscillator startup). This page synthesizes distributor pricing, verified same-family and cross-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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