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

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

The Microchip Technology PIC16C64A-20I/L is an 8-bit CMOS microcontroller from the PIC16C6X family, delivering 20 MHz maximum clock speed with 3.5 KB (2K x 14) of one-time-programmable (OTP) program memory and 128 bytes of RAM in a 44-pin PLCC package. Operating from 4.0 V to 5.5 V supply with industrial temperature range (-40 C to +85 C), the device exposes 33 digital I/O lines through five I/O ports and integrates a high-performance RISC core with 35 single-word instructions, all single-cycle except program branches which take two cycles. A microcontroller (MCU) is a single-chip computer containing a CPU, RAM, non-volatile program memory, and peripherals such as timers, interrupts, and I/O. PIC microcontrollers from Microchip use a Harvard RISC architecture that separates program and data buses, enabling most instructions to execute in one clock cycle. The PIC16C64A belongs to the mid-range PIC family, sitting between the baseline PIC10/12/16 and the enhanced PIC18 in features and complexity. Key differentiating features include 20 MHz operation, an 8-bit timer/counter with 8-bit prescaler, a 16-bit timer/counter, an analog comparator, a Watchdog Timer with its own on-chip RC oscillator for reliable operation, and synchronous/asynchronous serial port (SSP/SCI) capability. Power consumption is rated at 15 mA typical at 5 V, 4 MHz, and as low as 1 mA typical at 3 V, 32 kHz - a fully-static design that allows the clock to be stopped without losing register contents. The PIC16C64A implements Microchip's enhanced mid-range architecture with EPROM-based program storage, allowing prototype and small-volume manufacturing using a windowed or OTP package. The 44-pin PLCC variant (industrial -40 C to +85 C, indicated by the -20I/L suffix) is widely used in embedded control boards, instrumentation front-ends, and industrial automation controllers. Typical applications include industrial control logic, sensor signal conditioning front-ends, motor-control PWM drivers, UART-based communication bridges, and legacy embedded products requiring a proven 8-bit PIC core. It is also deployed as a slave controller in distributed I/O systems where deterministic single-cycle instruction execution simplifies timing analysis. When using this part, allocate sufficient decoupling (100 nF + 10 uF) close to VDD/VDD2/VSS pairs, ensure MCLR is pulled high through 10-100 kohm with a decoupling capacitor for reliable resets, and reserve the OSC1/OSC2 pins for the chosen crystal or resonator configuration. The OTP nature of the program memory means code must be correct before programming - consider PIC16F64A flash variant for development iteration. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, helping procurement and engineering teams compare the PIC16C64A-20I/L against current Microchip PIC16C6X and pin-compatible PIC16C65B family options.

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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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