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PIC16C642T-20E/SO - 8-Bit 20MHz OTP MCU 7KB | Microchip
PIC16C642T-20E/SO

PIC16C642T-20E/SO - 8-Bit 20MHz OTP MCU 7KB | Microchip

The Microchip Technology PIC16C642T-20E/SO is a member of the PIC16C family of 8-bit CMOS microcontrollers featuring a RISC core, 7KB (4K x 14) of One-Time Programmable (OTP) program memory, 176 bytes of SRAM, and 22 I/O lines, all integrated into a 28-pin SOIC package. It executes instructions at up to 20MHz, delivers a typical instruction cycle time of 200ns, and operates from a 5V supply. A microcontroller (MCU) is a single-chip integrated circuit that combines a CPU core, non-volatile program memory, working RAM, and a configurable set of peripheral modules. Within the broader semiconductor hierarchy, an MCU belongs to the class of programmable logic devices and is itself a subclass of microcomputers designed for embedded control. The PIC16C family is the mid-tier of Microchip's original PIC16C 8-bit portfolio, sitting between the PIC16C5x baseline and the PIC16C7x higher-performance parts. The PIC16C642T-20E/SO integrates an enhanced capture/compare/PWM (ECCP) module, an 8-bit analog-to-digital converter (ADC) with up to 8 input channels, a USART for asynchronous serial communication, and a synchronous serial port that supports SPI and I2C master/slave operation. The device also offers programmable brown-out reset, power-on reset, and a watchdog timer with its own on-chip RC oscillator for enhanced system reliability. Its Harvard architecture separates program and data paths, enabling simultaneous fetch and write operations that yield predictable, deterministic execution timing. Typical applications include industrial control and instrumentation, automotive body and chassis subsystems, smart sensor conditioning nodes, appliance controllers, and remote data acquisition nodes. Its small footprint, wide operating temperature range, and OTP programmability make it especially attractive for low-volume production runs where mask-ROM commitment is not economical. When designing with this part, note that the OTP memory means firmware cannot be field-updated; verify code before programming. Use the in-circuit debugger header or ICD pins for development, and reserve decoupling on VDD/VSS within 1 cm of the package. The PIC16C642T-20E/SO is supplied in tape and reel packaging for high-volume surface-mount assembly. This page synthesizes distributor pricing, drop-in alternatives from Microchip's PIC16C family and select competitors, and practical design notes that go beyond the manufacturer datasheet to accelerate design-in for engineers.

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PIC16C64A-04/L - 8-bit OTP MCU, 4MHz, 3.5KB | Microchip
PIC16C64A-04/L

PIC16C64A-04/L - 8-bit OTP MCU, 4MHz, 3.5KB | Microchip

The Microchip Technology PIC16C64A-04/L is an 8-bit CMOS microcontroller from the PIC16C family featuring a 4MHz maximum clock speed, 3.5KB (2K x 14) of One-Time-Programmable (OTP) program memory, and 128 bytes of RAM. It is supplied in a 44-pin PLCC (Leaded Chip Carrier) package with 33 digital I/O pins. This part is an industrial-temperature windowed/ceramic variant of the PIC16C64A core, optimized for embedded control applications requiring reliable 8-bit processing with deterministic RISC architecture. Background: An 8-bit microcontroller (MCU) is a single-chip computer integrating a CPU, memory (ROM/RAM), and programmable I/O peripherals. Within the MCU taxonomy, the PIC16C64A belongs to the PIC16C family, which in turn falls under the broader category of microcontrollers -> embedded processors -> integrated circuits. The PIC architecture uses a Harvard-design RISC CPU with 35 single-word instructions, making it well suited for cost-sensitive, deterministic real-time control. The OTP suffix means the program memory can be written once (mask ROM-like behavior at low NRE cost), making PIC16C64A variants appropriate for medium-volume production. Key features include a high-performance RISC CPU executing most instructions in a single clock cycle, 4MHz operation at 4V-5.5V supply, 33 I/O pins supporting digital I/O, two 8-bit timers and one 16-bit timer/counter, a USART serial port, and low-power operation (less than 2mA typical at 5V/4MHz, with sleep-mode currents under 1uA typical). The device offers multiple interrupt sources and a hardware watchdog timer. Architecturally, the PIC16C64A-04/L uses a Harvard memory structure with separate program and data buses, enabling simultaneous instruction fetch and operand access. Its RISC engine performs most instructions in one instruction cycle (4 oscillator clocks), giving a 4MHz oscillator a 1 MIPS instruction throughput. The wide operating voltage (2.5V-6.0V range across the family) and integrated peripherals (USART, timers, watchdog, capture/compare/PWM) eliminate external glue logic in typical embedded designs. Typical applications include industrial process control, motor control front-ends, automotive body electronics, sensor signal conditioning, keypad/display interfaces, embedded serial-communication nodes, and legacy replacement of older 8051 or HC11 designs where software IP exists for PIC assembly. The windowed ceramic L-package also serves engineering development and prototype builds. Design consideration: When migrating from PIC16C64A-04/L to a flash-memory equivalent (PIC16F877A or PIC16F877), note the pinout is largely compatible but the program memory technology differs. Designers should plan for ICP/ICD programming headers and decoupling (100nF + 10uF) close to VDD/VSS pins to support the 33 simultaneously-switching I/Os. This page synthesizes distributor pricing, OTP vs flash alternatives, and practical design notes beyond what the manufacturer datasheet alone provides.

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PIC16C64A-04/P - 8-Bit 4MHz OTP MCU, 3.5KB, 40-PDIP | Microchip
PIC16C64A-04/P

PIC16C64A-04/P - 8-Bit 4MHz OTP MCU, 3.5KB, 40-PDIP | Microchip

The Microchip Technology PIC16C64A-04/P is an 8-bit CMOS OTP (one-time programmable) microcontroller in the PIC16C6X mid-range family, operating at up to 4 MHz and housed in a 40-pin PDIP (plastic DIP, 0.600 inch / 15.24 mm) through-hole package. According to the manufacturer datasheet, it integrates 3.5 KB of program memory (2K x 14 words), 128 bytes of RAM, 33 digital I/O lines, and the classic PIC16C RISC core with only 35 single-word instructions to learn. The '04' suffix denotes a 4 MHz maximum clock, while the 'A' revision is an enhanced successor to the original PIC16C64 with improved electrical characteristics and a wider operating voltage range. A PIC microcontroller (Programmable Interface Controller) is a family of 8-, 16-, and 32-bit RISC-based microcontrollers originally developed by Microchip Technology. Within the PIC taxonomy, the PIC16C64A belongs to the mid-range (14-bit instruction word) PIC16C sub-family, which sits between the baseline PIC10/12/16 family and the high-performance PIC17C/PIC18C series. PIC MCUs are categorized as 8-bit microcontrollers (data path), Harvard architecture (separate program and data buses), and are widely used in embedded control due to their deterministic instruction timing, low cost, and ease of programming. Key features of the PIC16C64A-04/P include a fully static CMOS design, wide operating voltage range up to 6.0 V, and very low power consumption — typically 15 uA at 5 V / 4 MHz and as low as 1 uA at 3 V / 32 kHz, making it well suited for battery-backed applications. The device supports both commercial and industrial temperature ranges, includes an integrated Watchdog Timer with its own on-chip RC oscillator, and offers programmable code protection. Peripheral highlights include a Capture/Compare/PWM (CCP) module, a synchronous serial port (SSP) configurable for SPI or I2C, an 8-bit timer/counter (TMR0) with an 8-bit prescaler, a 16-bit timer/counter (TMR1), and an 8-bit timer/counter (TMR2) with period register. Architecturally, the PIC16C64A uses a 14-bit instruction word with a two-stage pipeline, providing single-cycle instruction execution except for program branches which take two cycles. Its Harvard architecture separates the program bus (14 bits wide) from the data bus (8 bits wide), enabling simultaneous instruction fetch and operand read. The Brown-out Reset (BOR) circuit holds the MCU in reset when VDD falls below a programmable threshold, protecting Flash/OTP integrity. An in-circuit debugger (ICD) is supported via the RB6/RB7 pins on most PIC16C6X parts. Typical applications include industrial control panels, automotive body electronics (non-safety), appliance control boards, security system panels, and low-end sensor hubs. The 33 I/O pins comfortably drive multiplexed LED displays, keypads, and relay drivers. When designing with the PIC16C64A-04/P, note that the OTP memory cannot be erased or rewritten — use the PIC16F64 or PIC16C65B flash-based equivalent for prototypes. Also ensure your programmer is set to the enhanced PIC16C6XA configuration; the legacy PIC16C64 settings will not program this device correctly. This page synthesizes distributor pricing, drop-in same-package alternatives from the PIC16C6X family, and practical design notes not found in the standalone manufacturer datasheet.

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PIC16C64A-04/PQ - 8-Bit 4MHz OTP MCU 3.5KB | Microchip
PIC16C64A-04/PQ

PIC16C64A-04/PQ - 8-Bit 4MHz OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16C64A-04/PQ is an 8-bit CMOS RISC microcontroller from the PIC16C family, featuring 4 MHz operation, 3.5 KB (2K x 14) of one-time-programmable (OTP) program memory, 128 bytes of RAM, and 33 digital I/O pins, all housed in a 44-pin MQFP (10x10 mm) surface-mount package. Its RISC architecture executes 200 ns single-cycle instructions from only 35 single-word instructions, achieving high throughput at low clock rates, while integrated peripherals include Brown-out Detect/Reset, Power-On Reset (POR), Pulse-Width Modulation (PWM), and a Watchdog Timer (WDT). A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (ROM/RAM), and programmable I/O peripherals on one die, enabling embedded control in applications ranging from washing machines to automotive ECUs. PIC microcontrollers, originally introduced by General Instrument and popularized by Microchip, sit within the broader taxonomy: microcontroller -> embedded controller -> semiconductor IC, and they specifically implement a Harvard RISC architecture with separate program and data buses. Key features of the PIC16C64A-04/PQ include 8-bit data width, 4 MHz maximum clock, 33 I/O pins across multiple ports, synchronous serial port (SSP) supporting SPI and I2C, parallel slave port, two 8-bit timer/counters and one 16-bit timer/counter, and a 14-bit instruction word. The OTP program memory (2K x 14 = 3.5 KB) is one-time programmable and not re-programmable in-circuit, making this part suitable for production runs where field firmware updates are not required. The 04 speed grade specifies a 4 MHz oscillator range, and the PQ suffix denotes the 44-pin Metric Quad Flat Pack (MQFP) package. The industrial/commercial operating temperature range typically covers 0C to +70C for the commercial grade (-04). Because this part is marked "Not Recommended for new designs" by Microchip and a newer version (PIC16C65B) is suggested as a replacement, long-term availability should be confirmed before new design-in. Typical applications include industrial control, appliance control, automotive subsystems (pre-AEC-Q100 era), low-end consumer electronics, and general-purpose embedded logic replacement. Designers should verify the specific OTP blank behavior, oscillator configuration (RC/HS/XT/LP), and programming specifications against the manufacturer datasheet before committing to production. When designing with this device, ensure the MCLR reset circuit, oscillator loading capacitors, and decoupling layout follow the datasheet reference design. Power-supply rise time and Brown-out Reset (BOR) trip points must be considered for reliable startup in noisy environments. Designers should plan ahead for end-of-life sourcing as Microchip has explicitly tagged this part as NRND. This page synthesizes distributor pricing, drop-in same-package alternatives from the PIC16C family, and practical design notes - information that is not assembled in the manufacturer datasheet alone.

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PIC16C64A-04/PT - 8-bit OTP MCU 4MHz 3.5KB TQFP-44 | Microchip
PIC16C64A-04/PT

PIC16C64A-04/PT - 8-bit OTP MCU 4MHz 3.5KB TQFP-44 | Microchip

The Microchip Technology PIC16C64A-04/PT is an 8-bit One-Time-Programmable (OTP) CMOS microcontroller from the PIC16C family, delivering 4 MHz CPU performance, 3.5 KB (2K x 14) of program memory, 128 bytes of RAM, and 33 digital I/O pins in a 44-pin TQFP surface-mount package. The "/PT" suffix designates the TQFP-44 package, while "-04" denotes the 4 MHz maximum oscillator frequency grade. According to the Microchip PIC16C64A datasheet, the device integrates a RISC instruction set, 14-bit wide instructions, an 8-level hardware stack, and a 20-year program retention window. An OTP microcontroller is a non-erasable, field-programmable MCU that retains firmware for the device lifetime after one programming pass. Within the broader taxonomy, the PIC16C64A sits in the 8-bit MCU -> microcontroller -> embedded controller -> semiconductor hierarchy. PIC16C devices use CMOS fabrication for low-power operation (typically < 2 mA active at 4 MHz, < 1 µA standby) and execute most instructions in a single 200 ns instruction cycle at 4 MHz, making them well-suited to deterministic real-time control. Key features include 33 I/O pins with individual direction control, a four-channel 8-bit analog-to-digital converter (ADC) with multiple reference options, three timer/counters (Timer0 with programmable prescaler, Timer1 16-bit, Timer2 with 8-bit period register), a synchronous serial port (SSP) supporting SPI and I2C master/slave, a parallel slave port for external bus expansion, and a watchdog timer with on-chip RC oscillator. The PIC16C64A also provides multiple oscillator modes including RC, XT, HS, and LP, plus an in-circuit serial programming (ICSP) interface for field updates before the OTP window closes. The architecture centers on a Harvard-style RISC CPU with separate program and data buses, a 14-bit program word, and a small instruction set that allows most operations to complete in one instruction cycle. Compared with earlier PIC16C6x parts, the "A" revision refined brown-out detect behavior and refined the ADC sampling path. The PIC16C64A is marked "Not Recommended for new designs" on the Microchip product page, with PIC16C65B cited as the newer version to consider. Typical applications include industrial control front-ends, appliance control boards, motor control signal conditioning, instrumentation sensor interfaces, and embedded control in legacy factory automation. The wide operating voltage range (typically 3.0 V to 6.0 V) and the 33 I/O pins support mixed analog/digital designs where the PIC16C64A acts as a glue controller between sensors, actuators, and a host MCU. When designing with this part, calculate worst-case active and sleep current from the datasheet curves, place decoupling capacitors as close as possible to VDD/VSS pins, and confirm that the chosen oscillator mode matches the external crystal or resonator. For new designs, evaluate the recommended successor (PIC16C65B family) before committing. This page consolidates datasheet specifications, distributor pricing, drop-in same-package alternatives, and practical design notes not assembled on the manufacturer datasheet alone.

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PIC16C64A-04E/PQ - 8-Bit 4MHz OTP MCU, 33 I/O, 44-MQFP | Microchip
PIC16C64A-04E/PQ

PIC16C64A-04E/PQ - 8-Bit 4MHz OTP MCU, 33 I/O, 44-MQFP | Microchip

The Microchip Technology PIC16C64A-04E/PQ is an 8-bit RISC CMOS one-time-programmable (OTP) microcontroller built on the PIC16C core, offering 4MHz maximum operating frequency, 3.5KB (2K x 14) of EPROM program memory, 128 x 8 bytes of RAM, and 33 digital I/O pins in a 44-pin Metric QFP (MQFP, 10x10 mm) package. According to the manufacturer product page, this device is part of the PIC16C6X family and is flagged "Not Recommended for new designs," with Microchip pointing to the PIC16C65B as the newer replacement for active designs and re-spins. An 8-bit OTP microcontroller (One-Time-Programmable Microcontroller) is a small, low-cost computer-on-a-chip that executes a fixed instruction set on 8-bit-wide data. In the embedded-systems taxonomy, it sits beneath general-purpose microcontrollers, above simple logic controllers, and within the broader class of microcontrollers -> MCUs -> semiconductors. OTP means the program memory can be written exactly once, after which the bit pattern is permanent; this makes OTP MCUs attractive for high-volume, cost-sensitive consumer and industrial products where firmware is stable and field re-programmability is not required. Key features of the PIC16C64A-04E/PQ include a 14-bit wide instruction word, 35 single-word instructions, 200ns instruction execution at 4MHz (5V), an 8-level hardware stack, and integrated peripherals such as Brown-out Detect/Reset, Power-on Reset (POR), Pulse-Width Modulation (PWM), and a Watchdog Timer (WDT). Serial connectivity is supported through I2C and SPI ports. The PIC16C core's RISC architecture with a single-cycle instruction fetch keeps deterministic timing simple for real-time control loops. Architecturally, the device is fully static CMOS, allowing the clock to be slowed to DC for low-power standby, and supports a 4V to 6V operating voltage range. The 33 I/O pins are grouped into ports for easy interfacing with switches, LEDs, keypads, and small sensor arrays; PWM and WDT are integrated to remove external timing components. Typical applications include appliance control, HVAC user-interface panels, simple sensor front-ends, automotive body controllers (predecessor generation), industrial operator panels, and white-goods motor control. The compact 44-MQFP footprint also makes it suitable for retrofit and form-factor-constrained boards where the PIC16 ecosystem is already deployed. When designing with this part, evaluate the supply-rail decoupling strategy (0.1 uF ceramic at VDD/VSS pairs), confirm the I/O sink/source budget against the load, and verify the oscillator configuration matches the in-circuit crystal or resonator. For new designs, prefer the recommended successor PIC16C65B or current-generation PIC16F1xxx Flash MCUs to avoid lifetime-buy pressure on this OTP device. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that are not available in the bare manufacturer datasheet, giving procurement and engineering teams a single source of truth for lifecycle, fit, and risk assessment.

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PIC16C64A-04E/PT - 8-Bit OTP MCU, 3.5KB EPROM, 4MHz, TQFP-44 | Microchip
PIC16C64A-04E/PT

PIC16C64A-04E/PT - 8-Bit OTP MCU, 3.5KB EPROM, 4MHz, TQFP-44 | Microchip

The Microchip Technology PIC16C64A-04E/PT is an 8-bit RISC CMOS microcontroller based on the PIC16 mid-range architecture, offering 3.5KB (2K x 14) of one-time-programmable (OTP) program memory and 128 bytes of RAM in a 44-pin TQFP (10x10mm) package. It executes most instructions in a single 200 ns cycle at 4 MHz, providing 5 MIPS throughput, and integrates 33 digital I/O lines grouped into five ports (PORTA-PORTE) with programmable direction registers. An 8-bit PIC microcontroller is a Harvard-architecture, RISC-based CMOS device in which program and data memories use separate buses. This separation allows instruction fetch and operand read to occur in the same cycle, giving PIC MCUs their characteristic deterministic execution time. Within the broader taxonomy, the PIC16C64A belongs to the PIC16 family of mid-range microcontrollers, which sits between the baseline PIC10/12/16 families and the high-end PIC18 family, and ultimately under the umbrella of embedded microcontrollers -> microcontrollers -> integrated circuits. The OTP (one-time-programmable) program memory uses EPROM cells, distinct from the flash-based PIC16F series. Key specifications include an external oscillator interface supporting up 4 MHz (4 in the suffix indicates the maximum frequency), an operating voltage range of typically 2.5 V to 6.0 V, and a brown-out reset / power-on reset subsystem. The device integrates a Synchronous Serial Port (SSP) supporting SPI and I²C master/slave modes, a USART for asynchronous serial communication, and three hardware timers (Timer0, Timer1, Timer2) suitable for event counting, input capture, output compare, and PWM generation. Peripherals include a 5-channel 8-bit ADC and a watchdog timer with its own on-chip RC oscillator. The PIC16C64A-04E/PT is well suited to embedded control applications that demand deterministic interrupt latency, simple peripheral set, and legacy code reuse. Typical use cases include industrial control logic, sensor interfacing, motor drive sequencing, and brown-field designs maintaining compatibility with the classic PIC16 mid-range instruction set. A key design consideration when using the PIC16C64A-04E/PT is OTP program memory: once programmed, the device cannot be re-programmed. Engineers should use a windowed (JW) sample for prototype iteration and reserve the OTP -04E/PT for production. The 'E' suffix denotes the industrial temperature grade (-40°C to +125°C). Microchip recommends migrating to PIC16F877A for new designs, as the PIC16C64A has been replaced by PIC16C65B per the manufacturer product page. This page synthesizes drop-in replacement alternatives, parametric comparison data, and application context not aggregated in any single manufacturer or distributor source.

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PIC16C64A-04I/L - 4MHz 8-Bit OTP MCU 3.5KB | Microchip PLCC-44
PIC16C64A-04I/L

PIC16C64A-04I/L - 4MHz 8-Bit OTP MCU 3.5KB | Microchip PLCC-44

The Microchip Technology PIC16C64A-04I/L is an 8-bit CMOS microcontroller in the PIC16C 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 PLCC package (16.59 x 16.59 mm). The device operates at 4 MHz and supports a supply voltage of 4V to 5.5V over the industrial temperature range of -40C to +85C. What is an 8-bit microcontroller? An 8-bit microcontroller is a single-chip computer that integrates a CPU, program memory (ROM/EPROM/Flash/OTP), data RAM, and peripheral interfaces on one die. The PIC16C family from Microchip uses a RISC (Reduced Instruction Set Computer) architecture with 35 single-word instructions, where all instructions execute in one instruction cycle except program branches (two cycles). The PIC16C64A sits in the hierarchy: 8-bit MCU -> PIC16C family -> PIC16C6X sub-family -> peripheral-rich members with parallel ports and capture/compare/PWM. Key features of the PIC16C64A-04I/L include 33 I/O pins, a 4 MHz maximum clock, three timer/counter modules, a synchronous serial port (SSP) supporting SPI and I2C, a USART for asynchronous serial communication, a capture/compare/PWM (CCP) module, and an 8-bit ADC with up to 8 channels. The wide operating voltage range and low power consumption (typically 15 uA at 5V/4 MHz and 1 uA at 3V/32 kHz) make it suitable for battery-powered and industrial applications. The PIC16C64A uses CMOS EPROM/ROM technology with a fully static design, allowing the clock to be stopped without losing register state. The Harvard architecture separates program and data buses, enabling instruction fetch and operand access in a single cycle. The 8-level hardware stack and interrupt controller handle nested subroutine calls and real-time events. Typical applications include industrial control systems, automotive body electronics, sensor signal conditioning, simple motor control via PWM, smart sensor nodes, and embedded data acquisition. The PIC16C64A is well suited to applications needing moderate I/O count, integrated analog, and reliable serial communication in a through-hole-friendly PLCC package. When designing with this part, note that OTP memory can be programmed only once; for engineering development, use the windowed CERDIP variant. The PLCC-44 package supports both socketed and surface-mount assembly, useful for legacy systems that require field-replaceable MCUs. This page synthesizes distributor pricing, drop-in alternatives within the PIC16C6X family, and practical design notes drawn from the manufacturer datasheet and Octopart cross-references.

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PIC16C64A-04I/P - 8-Bit 4MHz OTP MCU 3.5KB | Microchip
PIC16C64A-04I/P

PIC16C64A-04I/P - 8-Bit 4MHz OTP MCU 3.5KB | Microchip

The Microchip PIC16C64A-04I/P is an 8-bit CMOS OTP (One-Time Programmable) microcontroller from the PIC16C family, delivering 4 MHz maximum operating frequency, 3.5 KB (2K x 14) of program memory, and 128 bytes of RAM in a 40-pin PDIP (Plastic DIP) industrial-grade package. The -04I/P suffix denotes the 4 MHz speed grade, industrial temperature range (-40C to +85C), and PDIP through-hole package form factor. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, working RAM, and programmable I/O peripherals. The PIC16C family uses a RISC (Reduced Instruction Set Computer) architecture with only 35 single-word instructions, making it one of the easiest 8-bit MCU families to learn. MCUs sit within the broader embedded-computing hierarchy: microcontroller -> embedded processor -> semiconductor IC. The OTP variant means the program memory is user-programmable exactly once via a device programmer, then becomes read-only, making it suitable for low-cost, high-volume production where firmware is finalized. Key features include 33 digital I/O pins, an 8-bit timer/counter, a 16-bit timer/counter with capture/compare/PWM, an analog comparator, and a synchronous serial port (SSP) supporting SPI and I2C master/slave modes. The PIC16C64A's RISC pipeline executes most instructions in a single instruction cycle (200 ns at 20 MHz, 1 us at 4 MHz), giving deterministic timing suitable for real-time control loops. Power consumption is optimized through sleep mode with wake-up via interrupt or watchdog. Typical applications include industrial control systems, appliance controllers, automotive body electronics, simple sensor interfaces, and replacement of discrete logic circuits. The 40-pin PDIP package remains popular for through-hole prototyping, breadboarding, and educational platforms where socketed or hand-soldered parts simplify development. Industrial-grade temperature qualification supports factory-floor deployment. The newer Microchip PIC16F877A is the recommended Flash-memory successor with the same 40-pin pinout, in-circuit debugging, and 10x more program memory. The legacy PIC16C64A is generally used today only for legacy maintenance or exact BOM-replication tasks where OTP is acceptable. Engineers should confirm long-term availability before designing in this part. This page consolidates distributor pricing, drop-in compatible PIC16C alternatives, and practical design considerations not found in the manufacturer datasheet alone, helping engineers evaluate whether PIC16C64A-04I/P fits their application or whether a Flash-based successor is more appropriate for new designs.

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PIC16C64A-04I/PQ - 4MHz 8-Bit MCU, 3.5KB OTP, MQFP-44 | Microchip
PIC16C64A-04I/PQ

PIC16C64A-04I/PQ - 4MHz 8-Bit MCU, 3.5KB OTP, MQFP-44 | Microchip

The Microchip Technology PIC16C64A-04I/PQ is an 8-bit CMOS RISC microcontroller from the PIC16CXX mid-range family, featuring 4 MHz maximum clock speed, 3.5 KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 33 digital I/O lines, housed in a 44-pin Metric Quad Flat Pack (MQFP-44, 10x10 mm) package with industrial temperature grade (-40C to +85C). An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripherals on one die. Within the broader taxonomy, the PIC16C64A belongs to the RISC microcontroller class -> embedded microcontroller -> microcomputer -> integrated circuit. The 8-bit bus width means data is processed 8 bits at a time; the Harvard-style separate program/data buses accelerate instruction fetch, while the RISC instruction set reduces each instruction to a single 200 ns word at 20 MHz. Key features include 35 single-word instructions, all executing in one instruction cycle except program branches (two cycles), a programmable code protection bit, a watchdog timer with on-chip RC oscillator, and four counter/timer modules. The PIC16C64A integrates a synchronous serial port (SSP) supporting SPI and I2C, a USART for asynchronous serial communication, a 10-bit multi-channel analog comparator subsystem, and a Capture/Compare/PWM (CCP) module. The device operates from 2.5 V to 6.0 V across the industrial temperature range and supports in-circuit serial programming (ICSP) when used with the appropriate programming hardware. The OTP memory is one-time programmable, making this part best suited for mature production designs where firmware is fixed and high-volume programming is performed at the factory. For in-the-field firmware updates, Flash-based PIC16F equivalents are recommended. Typical applications include industrial control systems, automotive body and chassis subsystems, consumer appliance controllers, and embedded sensor interfaces. The wide operating voltage range and robust I/O count also make the PIC16C64A a fit for remote sensor data loggers and human-machine interface (HMI) panels where deterministic real-time response is critical. When designing with this part, note that OTP memory cannot be reprogrammed in-circuit; engineers should plan for a Flash-based PIC16F64A or PIC16F877A migration path during prototyping. A decoupling capacitor of 0.1 uF placed within 5 mm of VDD is recommended, and unused I/O pins should be configured as outputs low to minimize power consumption. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, enabling engineers to make faster BOM decisions for legacy or industrial systems.

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PIC16C64A-04I/PT - 8-bit OTP MCU, 3.5KB, 33 I/O | Microchip
PIC16C64A-04I/PT

PIC16C64A-04I/PT - 8-bit OTP MCU, 3.5KB, 33 I/O | Microchip

The Microchip Technology PIC16C64A-04I/PT is an 8-bit CMOS OTP (One-Time Programmable) microcontroller from the PIC16C family, delivering 4 MIPS performance at 4 MHz and housed in a 44-pin TQFP package. The device integrates 3.5 KB of program memory (2K x 14), 128 bytes of RAM, 33 digital I/O pins, and a rich peripheral set including three timers, a USART, a Capture/Compare/PWM module, and a parallel slave port. It operates across a 2.5V to 6.0V supply range and is specified over the industrial -40C to +85C temperature range. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, RAM, and peripherals on one die. Within the broader taxonomy, MCUs belong to microcontrollers, then embedded processors, then semiconductors. The PIC16C family specifically targets cost-sensitive, low-power, deterministic real-time control tasks and is known for its RISC-like 35-instruction set, single-cycle execution at 4 MHz, and Harvard architecture that separates program and data buses. PIC16C64A-04I/PT fits this niche as an intermediate-density device with enhanced I/O and serial communication capability. Key features of the PIC16C64A-04I/PT include its 33 digital I/O lines distributed across multiple ports, 8-channel 8-bit A/D converter with external reference option, two 8-bit timers plus one 16-bit timer with prescaler, USART for asynchronous and synchronous serial communication, and an 8-bit parallel slave port for external bus interfacing. The OTP memory architecture allows factory or prototype programming, which is cost-effective for low-volume or mature products. Internally, the device uses a 14-bit instruction word, an 8-bit data path, and a two-stage pipeline, providing predictable single-instruction-cycle latency (250 ns at 4 MHz) for time-critical control loops. The integrated Watchdog Timer with its own on-chip RC oscillator adds fault-recovery capability, and the Power-on Reset (POR) and Brown-out Reset (BOR) circuits simplify power-supply design. The device supports in-circuit serial programming (ICSP) via two pins. Typical applications include industrial control panels, appliance control boards, automotive body electronics (non-safety), sensor interface modules, and legacy embedded systems that have already been qualified on the PIC16C architecture. The wide 2.5-6.0V supply tolerance allows direct connection to 5V or 3.3V rails, and the 33 I/O count suits systems with multiple digital sensors, keypads, or LED arrays. When designing with this part, note that the 'I' suffix denotes the industrial temperature range and the 'PT' suffix denotes the 44-pin TQFP package. The 4 MHz speed grade is appropriate for systems that do not need the higher 20 MHz capability. Because this is an OTP device, code is permanently locked after programming; consider PIC16F64 (Flash) or PIC16C65B for reprogrammable variants during development. This page synthesizes distributor stock levels, parametric comparisons, and practical design notes for the PIC16C64A-04I/PT, providing engineering context beyond the manufacturer datasheet.

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PIC16C64A-10/L - 8-Bit 10MHz OTP MCU 3.5KB 44-PLCC | Microchip
PIC16C64A-10/L

PIC16C64A-10/L - 8-Bit 10MHz OTP MCU 3.5KB 44-PLCC | Microchip

The Microchip Technology PIC16C64A-10/L is an 8-bit CMOS microcontroller from the PIC16C6X family operating at 10 MHz, integrating 3.5 KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 33 digital I/O pins in a 44-pin PLCC (J-lead, windowed ceramic) package. It uses a high-performance RISC CPU core with only 35 single-word instructions, fully-static operation, and supports DC-10 MHz clock input with a 4V-6V supply voltage range. The OTP program memory and ceramic windowed package allow verification via UV erasure during development, although production parts ship with the window sealed. A microcontroller (MCU) is a single-chip computer containing a CPU, program memory (ROM/Flash/OTP), data memory (RAM), and programmable I/O peripherals. The PIC16C64A belongs to the 8-bit MCU category (bit-width: 8-bit), specifically the legacy OTP/EPROM-based sub-family, sitting within the broader taxonomy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. The PIC16C6X family uses a Harvard architecture with separate program and data buses, enabling single-cycle instruction execution for most opcodes and deterministic timing for embedded control loops. The 35-instruction RISC instruction set minimizes code complexity and learning curve, while 14-bit-wide instructions improve code density over 12-bit PIC cores. Key differentiating features include 33 I/O pins supporting direct LED or relay drive (each pin can source/sink up to 25 mA), two 8-bit and one 16-bit timer/counter modules, a synchronous/asynchronous serial port (USART/SCI), a parallel slave port (PSP) for external bus interfacing, and a 5-channel 8-bit Analog-to-Digital Converter (ADC) on the PIC16C65A sibling (note: the PIC16C64A does not include ADC). The wide operating voltage (2.5V-6.0V) and low power consumption (15 uA typical at 5V/4 MHz, 1 uA typical at 3V/32 kHz) make this device suitable for both battery-powered and line-powered applications. The PIC16C64A architecture uses CMOS EPROM technology with a fully-static design (clock can be stopped without losing state), brown-out reset protection, watchdog timer with on-chip RC oscillator for reliable operation, and a programmable code-protection mechanism for IP security. This mature mid-range PIC architecture has been deployed for decades in industrial control, automotive subsystems, and consumer appliances. Typical applications include industrial control systems, motor control (low-side drive), sensor interfaces with USART communication, simple HMI panels, and legacy embedded products. The PIC16C64A is rated NRND (Not Recommended for New Designs); Microchip recommends the PIC16C65B or PIC16F877A for new designs, but the PIC16C64A remains widely available for maintenance of installed equipment. When designing with this device, designers should note that the OTP memory cannot be reprogrammed in-circuit - programming must be done with a device programmer before insertion. The ceramic windowed package allows UV erasure for development cycles. Decoupling capacitors (0.1 uF ceramic) should be placed close to VDD/VSS pins, and the MCLR reset pin should be pulled high via a 10 kohm resistor for normal operation.

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PIC16C64A-10/P - 8-Bit 10MHz OTP MCU 3.5KB DIP-40 | Microchip
PIC16C64A-10/P

PIC16C64A-10/P - 8-Bit 10MHz OTP MCU 3.5KB DIP-40 | Microchip

The Microchip PIC16C64A-10/P is an 8-bit CMOS microcontroller built on the PIC16C core, offering 3.5KB of one-time programmable (OTP) program memory, 128 bytes of RAM, and 33 digital I/O lines in a 40-pin PDIP package. The device runs at a maximum clock of 10 MHz, delivering 200 ns instruction execution through the RISC-based PIC architecture. Operating from 4.0V to 6.0V, it targets cost-sensitive embedded control designs. What is a microcontroller (MCU)? A microcontroller is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and programmable I/O peripherals. Within the broader taxonomy, the PIC16C64A sits in the 8-bit MCU class (8-bit -> microcontroller -> embedded processor -> semiconductor). Its RISC core uses only 35 single-word instructions, making it friendly for assembly and C developers. OTP memory allows the device to be programmed once and retained for the life of the product. Key features include five 8-bit I/O ports, three hardware timers, a USART, a synchronous serial port (SSP) supporting SPI/I2C, an 8-bit parallel slave port, and dual analog comparators. The instruction set executes every instruction in a single cycle except program branches (two cycles), which keeps interrupt latency predictable. Power consumption is approximately 15 µA typical at 5V/4 MHz and as low as 1 µA at 3V/32 kHz, enabling battery-friendly designs. The PIC16C64A architecture uses Harvard memory buses - separate program and data paths - so instruction fetch and operand access occur in one cycle. This contrasts with Von Neumann MCUs that share a bus. The wide operating range (commercial/industrial/extended temperature) and windowed ceramic variants make the family useful in both production deployments and engineering development where UV-erasable versions speed iteration. Typical applications include industrial control boards, motor drive front-ends, smart sensor interfaces, and legacy consumer electronics. Designers value the PIC16C64A-10/P for its deterministic timing, mature toolchain (MPASM, MPLAB), and pin compatibility with newer flash-based siblings such as the PIC16F74. When designing with this part, reserve a 4.7 kΩ pull-up on MCLR and decouple VDD with a 100 nF plus 10 µF bulk capacitor near the package. Because the OTP memory cannot be erased, verify firmware in a windowed (JW) ceramic variant or a flash-based sibling during development before committing to OTP for volume.

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PIC16C64A-10/PT - 8-Bit 10MHz OTP MCU 3.5KB | Microchip
PIC16C64A-10/PT

PIC16C64A-10/PT - 8-Bit 10MHz OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16C64A-10/PT is an 8-bit CMOS microcontroller from the PIC16C6x family, featuring a 10MHz maximum operating frequency, 3.5KB (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 /PT suffix denotes the 44-pin TQFP industrial tray packaging variant of this legacy PIC microcontroller. As an OTP device, it is intended for low-volume, cost-sensitive production runs where in-circuit reprogrammability is not required. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, non-volatile data EEPROM, and a set of peripheral modules into one package. Within the broader PIC family, the PIC16C64A belongs to the mid-range PIC16 architecture, which is itself a subset of the 8-bit Harvard-architecture MCU category. This places the part in a lineage that runs: PIC16C64A -> PIC16C6x family -> PIC16 mid-range architecture -> 8-bit PIC microcontroller -> embedded MCU -> semiconductor. The mid-range architecture delivers roughly a 5x performance improvement over the earlier PIC16C5x baseline through a 14-bit instruction word, an 8-level hardware stack, and interrupt-driven peripheral control. Key features include 33 digital I/O pins across PORTA through PORTE, three timer modules (Timer0, Timer1, Timer2), a USART module for asynchronous/synchronous serial communications, and a Parallel Slave Port. The device operates from a 2.5V to 6.0V supply and is qualified for the 0C to +70C commercial temperature range. The TQFP-44 package is suitable for standard SMT assembly lines and offers a manageable footprint for hand-solderable prototypes. Typical applications include industrial control logic, embedded sensor interfaces, low-cost consumer electronics, motor control peripherals, and pre-production engineering builds that target a later flash-based PIC16F design. Designers frequently start with the PIC16C64A for cost-down OTP production after firmware is locked, then transition to PIC16F variants for flexibility during development. When designing with this device, note that OTP memory cannot be erased - firmware must be fully validated on a flash equivalent (such as PIC16F877A) before committing to the PIC16C64A for production. The /PT TQFP package requires a 0.8mm lead pitch layout, which is straightforward but demands reflow profile control. According to the Microchip PIC16C6X datasheet, the device is marked "Not Recommended for new designs" and Microchip recommends the PIC16C65B or the flash-based PIC16F877A as modern successors. This page synthesizes distributor pricing (LCSC: $4.2074 as of 2026-09-17), drop-in same-package alternatives, and practical design migration notes not aggregated in the manufacturer datasheet alone.

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PIC16C64A-10E/L - 8-bit OTP MCU 3.5KB 10MHz 44-PLCC | Microchip
PIC16C64A-10E/L

PIC16C64A-10E/L - 8-bit OTP MCU 3.5KB 10MHz 44-PLCC | Microchip

The Microchip Technology PIC16C64A-10E/L is an 8-bit CMOS microcontroller from the PIC16C6X family, featuring 3.5 KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, 33 digital I/O pins, and a 10 MHz maximum operating frequency, all housed in a 44-pin PLCC package. The "/L" suffix designates the leadless PLCC (Plastic Leaded Chip Carrier) form factor, while "-10E" specifies the 10 MHz speed grade and the Extended temperature range (-40C to +125C). Operating voltage spans 2.5 V to 6.0 V across commercial, industrial, and extended grades. What is an OTP microcontroller? An OTP (One-Time-Programmable) microcontroller is a class of MCU whose program memory can be written only once after manufacture using an external programmer. OTP MCUs sit hierarchically between mask-ROM devices (cheapest at high volume but require full mask commitment) and Flash MCUs (re-programmable, higher cost per bit). They are widely used in mature consumer appliances, automotive sub-systems, and industrial controllers where firmware is finalized and unit cost dominates. The PIC16C6X family specifically pioneered the RISC architecture in low-cost 8-bit microcontrollers. Key features include a fully-static CMOS design allowing DC to 10 MHz clock input, low power consumption of 15 uA typical at 5 V / 4 MHz and only 1 uA typical at 3 V / 32 kHz, an 8-bit timer/counter with 8-bit prescaler, a Watchdog Timer with its own on-chip RC oscillator for reliable operation, and a Capture/Compare/PWM (CCP) module. The 14-bit instruction word enables compact code, and only 35 single-word instructions need to be learned. The PIC16C64A-10E/L uses a Harvard architecture with separate program and data buses plus a 14-bit instruction set, an 8-level deep hardware stack, and direct, indirect, and relative addressing modes. The device supports in-circuit serial programming (ICSP) via two pins, eliminating the need for a socketed programmer. Brown-out reset circuitry protects against low-Vdd code corruption. Typical applications include industrial control logic boards, appliance controllers, automotive body electronics, security alarm panels, and sensor interface modules. The wide 2.5 V to 6.0 V operating range also supports battery-backed instrumentation and 5 V industrial bus nodes. When designing with this MCU, reserve the MCLR/Vpp pin for in-circuit programming access and place a 10 kohm pull-up on it for normal operation. Decouple VDD with 0.1 uF ceramic as close to the pins as possible, and avoid long traces on OSC1/OSC2 to reduce EMI susceptibility. Brown-out detection must remain enabled for code integrity in noisy industrial environments. This page synthesizes current distributor pricing, drop-in compatible PLCC alternatives, and practical design notes for engineers sourcing the PIC16C64A-10E/L, complementing the official Microchip datasheet with comparison and selection content not found in any single manufacturer document.

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PIC16C64A-10E/PT - 8-Bit 10MHz 3.5KB OTP MCU | Microchip
PIC16C64A-10E/PT

PIC16C64A-10E/PT - 8-Bit 10MHz 3.5KB OTP MCU | Microchip

The Microchip Technology PIC16C64A-10E/PT is an 8-bit RISC microcontroller from the PIC16C family featuring 3.5KB (2K x 14) of One-Time Programmable (OTP) program memory, 128 bytes of RAM, and 33 digital I/O pins, all housed in a 44-pin TQFP (10x10 mm) package. It executes instructions at a 10 MHz clock rate and operates across a 2.5V to 6.0V supply range, with the "E" suffix denoting the extended industrial temperature grade of -40C to +125C. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces. Within the broader semiconductor taxonomy, an MCU sits under microprocessor units, then digital ICs, then integrated circuits. The PIC16C64A belongs to the mid-range PIC16C class, which uses a Harvard RISC architecture with separate program and data buses, allowing instruction fetching and data access to occur in the same cycle for predictable deterministic timing. Key features include 14-bit wide instruction words for compact code density, a hardware multiply option in selected parts, two 8-bit timer/counters with optional prescalers, a 16-bit timer/counter, an 8-bit parallel slave port, a USART serial port, and a watchdog timer with its own on-chip RC oscillator for fail-safe operation. The 33 I/O pins can source/sink up to 25 mA each, making the device suitable for direct LED and relay driving without external buffers. Architecturally, the PIC16C64A uses a 35 single-word instruction set with most instructions executing in a single 200 ns instruction cycle at 10 MHz (4 clocks per cycle). Its 8-level deep architecture plus hardware stack provides interrupt-driven response. OTP memory requires a one-time programming step during production, distinguishing it from Flash-based PIC16F successors. Typical applications include industrial control panels, motor control, HVAC fan controllers, automotive body electronics (non-safety), appliance control boards, and embedded instrumentation. The wide 2.5V to 6V operating range accommodates both 3.3V and 5V system designs. When designing, plan OTP programming flow carefully - OTP cannot be erased, so code must be validated on a windowed/Flash equivalent before production programming.

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PIC16C64A-10I/L - 10MHz 8-Bit OTP MCU 3.5KB | PLCC-44 | Microchip
PIC16C64A-10I/L

PIC16C64A-10I/L - 10MHz 8-Bit OTP MCU 3.5KB | PLCC-44 | Microchip

The Microchip Technology PIC16C64A-10I/L is an 8-bit RISC microcontroller in the PIC16C family, delivering 10 MIPS of throughput at a 10 MHz clock and housed in a 44-pin PLCC (16.59x16.59 mm) package. The part integrates 3.5 KB of one-time-programmable (OTP) program memory (2K x 14 words), 128 bytes of data RAM, and 33 digital I/O lines organized across multiple ports. It operates from 4.0 V to 5.5 V across the industrial -40C to +85C temperature range and is fabricated in low-power CMOS EPROM/ROM technology. An 8-bit microcontroller (MCU) is a programmable integrated circuit that executes application firmware stored in on-chip non-volatile memory and interfaces with peripherals through digital and analog I/O. The PIC16C family uses a Harvard-architecture RISC core in which program and data memories are separate, the program store is word-addressed (14-bit instructions here), and most instructions complete in a single clock cycle. Within the broader taxonomy, this device is a microcontroller -> embedded processor -> programmable logic device -> semiconductor IC. It sits one tier below 16-bit PIC24 and dsPIC parts and is suitable where deterministic cycle counting, low BOM cost, and OTP/EPROM-based code storage are acceptable. Key differentiating features of the PIC16C64A-10I/L include 35 single-word instructions, a fully static design (clock can be halted), interrupt capability with a context-saving hardware stack, and on-chip peripherals such as a 16-bit timer/counter with a prescaler, an 8-bit timer/counter, a synchronous serial port (SSP) supporting SPI and I2C master/slave modes, a parallel slave port (PSP) for external bus expansion, an 8-bit ADC variant option, and a watchdog timer with its own on-chip RC oscillator for reliable brown-out recovery. From an architectural perspective, the device separates program and data buses (Harvard), uses a 14-bit instruction word to keep code density high, and provides direct, indirect, and relative addressing modes. Power consumption is typically < 2 mA at 5 V / 4 MHz and < 1 uA in standby with the watchdog disabled, which enables battery-backed designs. The 10 MHz -10 speed grade pairs with industrial-temperature silicon, while faster -20 variants are available for commercial applications. Typical applications include industrial control panels, motor-driver front-end controllers, instrumentation and metering, embedded sensor hubs, automotive body/comfort modules, low-cost consumer appliances, and legacy PIC16C5X/PIC16C6X upgrade platforms where pin-compatible drop-in replacements are needed. Engineers frequently migrate to PIC16F or PIC18 Flash parts for new designs but keep the OTP PIC16C64A for cost-sensitive, code-frozen production. Design consideration: the 'I' suffix denotes the industrial temperature grade (-40C to +85C); choose the 'E' (extended -40C to +125C) variant for under-hood automotive use. OTP memory can be programmed only once; allow a windowed ceramic package (-JW) version for prototype code iteration, then move to plastic OTP for volume production. This page synthesizes distributor pricing, application-aligned design notes, drop-in alternative MPNs from the same PIC16C family, and practical thermal/programming guidance not consolidated in any single Microchip document.

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PIC16C64A-10I/P - 10MHz 8-bit OTP MCU 3.5KB | Microchip | DIP-40
PIC16C64A-10I/P

PIC16C64A-10I/P - 10MHz 8-bit OTP MCU 3.5KB | Microchip | DIP-40

The Microchip Technology PIC16C64A-10I/P is an 8-bit CMOS microcontroller in the PIC16C family, integrating 3.5KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 33 digital I/O pins in a 40-pin PDIP through-hole package. Operating at up to 10MHz from a 4.0V to 6.0V supply, this industrial-temperature (-40C to +85C) variant combines the legacy PIC16C6x peripheral set (USART, SSP/SPI/I2C, two Capture/Compare/PWM modules, an 8-bit ADC-free timer architecture, and parallel slave port) with Microchip's RISC Harvard architecture executing one instruction per clock cycle (200 ns at 10 MHz). A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + data), and programmable peripherals on one die. Within the broader taxonomy, the PIC16C64A sits in the legacy 8-bit OTP MCU category: MCU -> 8-bit microcontroller -> PIC16 family -> PIC16C6x sub-family (mid-range OTP). The 'C' suffix designates the OTP/EPROM-based program memory variant (not flash), which is a one-time programmable technology historically favored for low-cost, high-volume, mature designs. The '64A' is the pin/peripheral-compatible upgrade to the original PIC16C64 with extended instruction set and lower power consumption. Key features of the PIC16C64A-10I/P include 3.5KB OTP program memory, 128 bytes RAM, 33 I/O pins, two 8-bit and one 16-bit timer/counter, USART for serial communication, SSP for SPI and I2C, two CCP modules for PWM/capture/compare, an 8-bit parallel slave port for external bus attachment, and a watchdog timer with on-chip RC oscillator. The 10 MHz clock rate delivers 5 MIPS, which is sufficient for slow control loops, human-machine interface polling, and sensor aggregation. The architecture uses a 14-bit wide instruction word with separate 14-bit program and 8-bit data buses, enabling single-cycle instruction fetch with concurrent data access. The Harvard structure, combined with a 35-instruction RISC set, produces highly deterministic timing essential for interrupt-driven control firmware. The device includes brown-out reset and power-on reset for reliable startup in electrically noisy industrial environments. Typical applications for this device include industrial control panels, appliance controllers, automotive body electronics (non-safety), HVAC thermostats, simple sensor aggregators with serial uplink, and legacy embedded products that have been in continuous production since the late 1990s. The PDIP-40 package is also widely used in education and breadboard prototyping. When designing with the PIC16C64A-10I/P, note that OTP memory cannot be erased or rewritten; firmware must be validated on a flash-based sibling (e.g., PIC16F74-I/P in the same 40-pin PDIP) before committing to OTP. Engineers migrating to a flash variant should plan for code-compatibility verification because peripheral registers differ slightly between the PIC16C6x and PIC16F7x families. This page consolidates distributor stock, parametric alternatives, and drop-in substitution guidance not found in the manufacturer datasheet alone - particularly useful for sustaining legacy designs where the OTP part remains the only BOM-approved option.

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PIC16C64A-10I/PT - 8-Bit OTP MCU, 10MHz, 44-TQFP | Microchip
PIC16C64A-10I/PT

PIC16C64A-10I/PT - 8-Bit OTP MCU, 10MHz, 44-TQFP | Microchip

The Microchip Technology PIC16C64A-10I/PT is an 8-bit CMOS microcontroller from the PIC16C family, featuring a 3.5KB (2K x 14) One-Time Programmable (OTP) program memory and 128 x 8 bytes of RAM, housed in a 44-pin TQFP (10x10 mm) surface-mount package. It operates at a maximum clock speed of 10 MHz, with 33 digital I/O pins and integrated peripherals including a USART, parallel slave port, and capture/compare/PWM modules. The device runs from a 2.5V to 6.0V supply and is qualified for the industrial -40C to +85C temperature range, denoted by the "I" suffix. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash/OTP), data memory (RAM), and peripheral interfaces. The PIC16C64A belongs to Microchip's mid-range PIC16C family, which uses a RISC architecture with a fixed 14-bit instruction word. Compared with flash-based successors (PIC16F), OTP parts like the PIC16C64A ship unprogrammed and are programmed exactly once at production; this makes them suitable for high-volume, cost-sensitive, and tamper-resistant applications. Key features of the PIC16C64A-10I/PT include a 200 ns instruction cycle at 10 MHz, hardware USART for serial communication, a Parallel Slave Port for external bus interfacing, two CCP modules, an 8-bit timer/counter (TMR0) plus TMR1/TMR2, a Watchdog Timer with its own on-chip RC oscillator, and Brown-out Reset protection. The 33 I/O lines can source/sink up to 25 mA per pin, sufficient to drive LEDs and small relays directly. Architecturally, the PIC16C64A uses a Harvard structure with separate program and data buses, a 14-bit-wide instruction word, and a two-stage pipeline. OTP storage provides inherent code security (cannot be read back after programming), and the 128-byte RAM is shared between general-purpose variables and the hardware stack (8 levels deep). Typical applications include industrial control panels, appliance control boards, automotive body modules (non-safety), simple sensor interfaces, and low-cost consumer electronics. Engineers often choose the PIC16C64A-10I/PT when code security, deterministic interrupt response, and low unit cost outweigh the convenience of in-system reprogrammability. When designing with this device, note that OTP memory must be programmed before solder-mount, so firmware changes require a socketed prototype or a windowed ceramic JW variant for development. Always derate the 25 mA I/O source/sink rating when multiple pins switch simultaneously, and place a 0.1 uF decoupling capacitor within 5 mm of VDD. This page synthesizes distributor pricing, OTP-vs-flash drop-in alternatives in the same 44-TQFP footprint, and practical design notes not consolidated in the manufacturer datasheet.

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PIC16C64A-20/P - 8-Bit 20MHz OTP MCU 3.5KB | Microchip
PIC16C64A-20/P

PIC16C64A-20/P - 8-Bit 20MHz OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16C64A-20/P is an 8-bit CMOS microcontroller built on the PIC16C6X RISC core, delivering 20 MHz clock speed, 3.5 KB (2K x 14) of one-time-programmable (OTP) program memory, and 128 bytes of RAM in a 40-pin PDIP package. Its reduced instruction set of only 35 single-word instructions, all single-cycle except program branches (two cycles), yields deterministic throughput suited to control loops and event-driven firmware. Background knowledge: A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and peripheral set on one die. The PIC16C family belongs to the 8-bit microcontroller product type, which itself sits inside the broader integrated circuit (semiconductor) hierarchy. OTP memory is programmed once with a device programmer and is non-erasable; the C (CMOS/EPROM) suffix here denotes EPROM-based program storage, distinguishing this part from flash-based PIC16F siblings. Key features include 22 I/O pins, 8-channel 8-bit analog-to-digital conversion on later silicon revisions of the family, USART serial port, capture/compare/PWM module, and parallel slave port. Wide operating voltage range spans 2.5 V to 6.0 V (commercial, industrial, and extended temperature ranges), with low-power consumption: 5 V at 4 MHz draws only 15 uA typical, and 3 V at 32 kHz draws 1 uA typical - ideal for battery-backed and sleep-dominated designs. Technical depth: the PIC16C64A uses a Harvard architecture with separate program and data buses, allowing instruction fetch and operand read to occur in the same cycle. Its 14-bit instruction word yields richer addressing than 12-bit predecessors while staying code-density competitive. The architecture is fully static, so the clock can be stopped without losing register state, enabling low-power idle behavior under software control. Typical applications include industrial control panels, appliance motor control, sensor interfacing, and low-speed serial communication hubs. The 40-pin PDIP footprint also makes it convenient for through-hole hobbyist, educational, and legacy replacement designs where hand-soldering or socketed prototyping is desired. Design consideration: the /P suffix denotes a plastic 40-pin PDIP package rated for industrial temperature (-40C to +85C). Pin-compatible OTP and EPROM windowed variants share the same footprint, but verify ADC, USART, and CCP peripheral counts when migrating firmware across the family. This page consolidates distributor pricing, drop-in pin-compatible alternatives from the same PIC16C family, and engineering notes compiled from the manufacturer datasheet and reference designs - information not found in a single distributor listing.

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PIC16C64A-20/PQ - 20MHz 8-bit CMOS MCU 3.5KB EPROM | Microchip
PIC16C64A-20/PQ

PIC16C64A-20/PQ - 20MHz 8-bit CMOS MCU 3.5KB EPROM | Microchip

The Microchip Technology PIC16C64A-20/PQ is an 8-bit CMOS EPROM-based microcontroller from the PIC16C6X family, operating at up to 20 MHz clock input and housed in a 44-pin MQFP (Metric Quad Flat Pack) surface-mount package. It integrates 3.5 KB of one-time-programmable (OTP) program memory, 128 bytes of RAM, and 33 digital I/O lines organized across multiple ports for peripheral interfacing. The device is built on Microchip's high-performance RISC architecture using only 35 single-word instructions, with single-cycle execution except for two-cycle program branches. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, RAM, and programmable peripherals. It belongs to the product hierarchy: microcontroller -> embedded processor -> integrated circuit -> semiconductor. The PIC16C6X family specifically targets cost-sensitive embedded applications requiring deterministic instruction execution, low power consumption, and compact code density. The PIC16C64A combines this RISC CPU with parallel ports, timers, and a USART, suitable for control loops, sensor interfacing, and human-machine interface designs. Key features include a 20 MHz maximum operating frequency, wide 2.5 V to 6.0 V supply range, low-power consumption (15 uA typical at 5 V / 4 MHz and 1 uA at 3 V / 32 kHz), and fully static design that allows the clock to be stopped without losing register state. Program memory is 3.5 KB OTP EPROM, providing one-time field programmability through Microchip's standard device programmers. The 33 I/O pins support digital I/O with individual direction control, while on-chip peripherals include timers and a synchronous/asynchronous serial port (USART/SCI). The architecture employs a Harvard-style separate program and data buses, with a 14-bit instruction word and 8-bit data path. The 8-level deep hardware stack supports subroutines and interrupts without external memory, while the 2K x 14 instruction-word program memory (3.5 KB total with configuration bits) maps directly to the device's 35-instruction opcode set, enabling very compact assembly code and predictable real-time response. Typical applications include industrial control systems, automotive body electronics, appliance controllers, security and access control panels, and sensor-based measurement instruments. The device is widely used in legacy designs and replacement scenarios where proven PIC16C6X firmware is preserved without redevelopment. The -20 speed grade and /PQ package make this variant particularly suited for surface-mount manufacturing lines where commercial temperature grade (0C to +70C) and 20 MHz throughput are required. When designing with this device, note that OTP EPROM cannot be erased in-circuit; for prototyping or code-iteration workflows, a windowed CERDIP package variant (such as PIC16C64A-20/P) is preferable. The 44-pin MQFP package requires careful PCB layout with adequate ground plane and short trace lengths to the crystal and decoupling capacitors. Operating voltage should be maintained within 2.5 V to 6.0 V, with Vdd decoupling placed within 1 cm of the supply pin per Microchip's recommended layout practices. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone. The content below is curated for component engineers evaluating the PIC16C64A-20/PQ for new designs, lifecycle substitution, or maintenance of legacy systems.

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PIC16C64A-20E/L - 8-Bit 20MHz OTP MCU, 3.5KB, 44-PLCC | Microchip
PIC16C64A-20E/L

PIC16C64A-20E/L - 8-Bit 20MHz OTP MCU, 3.5KB, 44-PLCC | Microchip

The Microchip Technology PIC16C64A-20E/L is an 8-bit CMOS EPROM/ROM-based microcontroller in the PIC16C6X family, offering 3.5KB (2K x 14) of One-Time Programmable (OTP) program memory and 128 bytes of RAM, housed in a 44-lead PLCC package. It runs at up to 20 MHz clock input with 200 ns instruction execution and exposes 33 digital I/O pins across five ports. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data memory, and peripherals on one die. Within the broader taxonomy, a microcontroller belongs to the integrated circuit (IC) family and specifically the microcontroller subcategory, sitting alongside microprocessors, DSPs, and FPGAs. The PIC16C6X architecture uses a RISC (Reduced Instruction Set Computer) instruction set with only 35 single-word instructions, where all instructions execute in one cycle except program branches (two cycles), making code generation compact and deterministic for embedded developers. Key features include a wide operating voltage range of 2.5V to 6.0V (commercial/industrial/extended grades), low-power consumption at 5V/4 MHz of approximately 15 µA typical and 3V/32 kHz of approximately 1 µA typical, a fully static design that supports DC to 20 MHz operation, an 8-bit timer/counter with 8-bit prescaler, a watchdog timer, and analog comparator peripheral support. The /L package suffix denotes the 44-lead PLCC (Plastic Leaded Chip Carrier) form factor, a J-lead surface-mount package well suited for socketed industrial designs and through-hole-friendly repair workflows. The PIC16C64A-20E/L uses Harvard architecture with separate program and data buses, EPROM-based program storage, and CMOS fabrication. Its -20E speed designation indicates 20 MHz maximum clock at the Extended temperature range (-40°C to +125°C), distinguishing it from the standard 0°C to +70°C commercial version. This part falls under Microchip's "Not Recommended for new designs" status with the newer PIC16C65B suggested as a successor in the same family. Typical applications include industrial automation control loops, consumer-electronics user-interface controllers, low-power battery sensing nodes, automotive body and chassis subsystems, and legacy embedded systems that require a stable CMOS OTP supply chain. The wide temperature range and 33 I/O count make it a fit for HMI panels, motor-control front ends, and instrumentation front ends. When designing with this device, ensure in-circuit serial programming (ICSP) header access for OTP programming, validate the minimum 4.0V Vdd for 20 MHz operation, and budget for the OTP one-time-program window during production. Consider migrating to PIC16C65B or a flash-based PIC16F equivalent for new designs to gain re-programmability and modern peripherals. This page synthesizes distributor pricing, drop-in package alternatives, and practical engineering notes not found in the manufacturer datasheet alone.

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PIC16C64A-20E/P - 8-bit OTP MCU, 20MHz, 3.5KB, 40-PDIP | Microchip
PIC16C64A-20E/P

PIC16C64A-20E/P - 8-bit OTP MCU, 20MHz, 3.5KB, 40-PDIP | Microchip

The Microchip Technology PIC16C64A-20E/P is a member of the PIC16C6X family of 8-bit CMOS microcontrollers built on Microchip's RISC architecture, offering 3.5 KB of one-time programmable (OTP) program memory (2K x 14 words) and 192 bytes of data RAM in a 40-pin Plastic DIP package. The device operates from DC to 20 MHz clock input with a 200 ns instruction cycle, runs from 3.0 V to 6.0 V, and is graded for the Extended temperature range (-40C to +125C), making it suitable for harsh-environment embedded control. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, digital I/O, and on-chip peripherals such as timers, capture modules, and a USART. The PIC16C family sits in the broader taxonomy of microcontroller -> embedded processor -> semiconductor device. PIC MCUs use a Harvard RISC core with only 35 single-word instructions, where all instructions execute in one cycle except program branches (two cycles), enabling deterministic real-time response in control loops. Key features of the PIC16C64A-20E/P include five 8-bit I/O ports (PORTA-PORTE), three timer/counters (TMR0, TMR1, TMR2), a 2-capture/compare/PWM module, a USART with on-chip baud-rate generator, an 8-bit A/D converter (on selected pins), a watchdog timer with on-chip RC oscillator, and in-circuit serial programming (ICSP) via RB6/RB7. The device draws < 2 mA typical at 5 V / 4 MHz and < 1 µA typical standby current at 3 V / 32 kHz. Architecturally, the PIC16C64A uses a 14-bit instruction word with a 8-bit data path, a hardware stack depth of 8, and direct, indirect, and relative addressing modes. The on-chip EPROM-based program store is one-time programmable (OTP), distinguishing it from the FLASH-based PIC16F family; for in-system reprogrammability the PIC16F64A or PIC16F74 family should be considered. Typical applications include industrial process control, automotive body electronics, motor control (low-side PWM drive), smart sensor interfaces, and legacy embedded systems where the long-life, second-source PIC architecture remains specified by end customers. The 20 MHz throughput supports protocols such as RS-232, RS-485, and I2C master mode in software bit-banging. When designing with the PIC16C64A, note that MCLR must be tied to VDD through a 10 kohm pull-up and that decoupling requires a 0.1 uF ceramic capacitor placed within 5 mm of the VDD pin. The '20E' suffix denotes 20 MHz operation, Extended temperature; 'P' denotes 40-pin PDIP. Note: this part is Not Recommended for new designs (NRND) per Microchip's product status page.

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PIC16C64A-20E/PT - 8-Bit 20MHz OTP MCU 3.5KB | Microchip
PIC16C64A-20E/PT

PIC16C64A-20E/PT - 8-Bit 20MHz OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16C64A-20E/PT is an 8-bit CMOS microcontroller from the PIC® 16C family, delivering up to 20 MHz operation with 3.5 KB (2K x 14) of One-Time Programmable (OTP) program memory and 128 bytes of RAM, housed in a 44-pin TQFP (PT) package measuring 10x10 mm. The 'E' suffix denotes the extended industrial operating temperature range of -40 °C to +125 °C, while the '20' speed grade specifies the 20 MHz maximum oscillator frequency. An 8-bit OTP microcontroller is a single-chip computer built around an 8-bit data path and Harvard architecture, executing one instruction per instruction cycle (four clock cycles). Within the broader product hierarchy, the PIC16C64A belongs to the PIC16C family -> PIC16 mid-range microcontrollers -> 8-bit MCUs -> microcontrollers -> microprocessors and logic devices -> semiconductors. One-Time Programmable memory means the device is programmed once and cannot be erased, which makes this part well suited for high-volume, cost-sensitive, fully matured production runs where firmware is final. The PIC16C64A is now considered a legacy/obsolete device in the Microchip portfolio. Key features include 33 general-purpose digital I/O pins, an integrated USART for asynchronous and synchronous serial communication, a Synchronous Serial Port (SSP) supporting both SPI and I²C master/slave modes, three hardware timers (Timer0, Timer1, Timer2), an 8-bit ADC with 8 input channels (on 'A' revision parts), and a capture/compare/PWM (CCP) module. Brown-out Reset and a watchdog timer with its own on-chip RC oscillator provide system-level robustness. The device operates from 2.5 V to 6.0 V and is fabricated on a low-power CMOS process. Typical applications include industrial control systems, automotive body electronics, white goods and appliance control, instrumentation, and any cost-sensitive embedded design that has transitioned out of the prototyping phase and into stable volume production. The wide temperature range supports both outdoor and under-hood deployments, while the integrated peripherals eliminate external UART and SPI bridges. When migrating from OTP to flash memory, designers should evaluate the PIC16F77 or PIC16F877A as flash-based equivalents. The PT suffix indicates lead-free matte-tin TQFP termination suitable for modern reflow profiles. This page synthesizes distributor pricing, drop-in TQFP-44 alternatives, and practical design notes not found in the standalone Microchip datasheet.

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