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PIC17C43T-25E/PT - 8KB OTP 8-bit MCU, 25MHz, 44-TQFP | Microchip
PIC17C43T-25E/PT

PIC17C43T-25E/PT - 8KB OTP 8-bit MCU, 25MHz, 44-TQFP | Microchip

The Microchip Technology PIC17C43T-25E/PT is a high-performance 8-bit CMOS RISC microcontroller from the PIC17C family, integrating 8 KB (4K x 16) of One-Time Programmable (OTP) program memory, 454 bytes of RAM, and 33 digital I/O pins in a 44-pin TQFP surface-mount package. Operating at up to 25 MHz from a 5 V supply, this part delivers approximately 121 ns instruction cycle time and is engineered for embedded-control applications requiring deterministic response and a moderate memory footprint. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, integrating a CPU core, program memory (ROM/OTP/Flash), working RAM, peripherals, and I/O into one package. The PIC17C family belongs to the broader PIC microcontroller taxonomy (PIC10/12/16/17/18/24/dsPIC), which Microchip subdivides by data width, instruction set and peripheral richness. Within power-management and control hierarchies, the PIC17C line sits between baseline PIC16 devices and enhanced PIC18 devices, offering a wider instruction set, hardware multiply, and an external-memory bus on selected die variants for legacy designs migrating from 80C51-class controllers. Key features of the PIC17C43T-25E/PT include a RISC architecture with only 58 single-cycle instructions, dual 8-bit timer/counters with 16-bit read/write, a 16-bit capture input, a 16-bit PWM output, a hardware USART with addressable transmit/receive buffer, and an 8-channel 10-bit (typical) successive-approximation ADC. The Extended (E) temperature grade supports -40C to +125C operation, and the /PT suffix designates a 44-pin TQFP package supplied in Tape & Reel packaging for high-volume SMT assembly. The device also exposes an external-memory interface capable of addressing up to 64 Kbytes of external program memory and 64 Kbytes of external data memory, which is unusual for a modern 8-bit MCU. Typical applications include industrial automation controllers, automotive subsystems (where the E temperature grade matters), consumer-electronics keypads and remote-control transmitters, motor control for small DC/stepper drives, instrumentation front ends, and legacy embedded designs migrating from older 80C51 or PIC16 platforms. The combination of OTP memory, wide temperature range, and an external memory bus makes the PIC17C43T-25E/PT a strong fit for production-volume designs that must remain code-locked while still tolerating harsh environments. When designing with this device, engineers must provide a 5 V regulated supply, an external clock source (oscillator type is listed as External in the manufacturer data), and observe the OTP programming window (typically high-voltage VPP). Modern replacements from Microchip such as the PIC18F family offer Flash memory and lower power, but the PIC17C43T-25E/PT remains preferred where field-proven PIC17C code bases, OTP security, or long-term stability of the PIC17 silicon revision are required.

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PIC17C43T-25I/PQ - 8-bit 25MHz OTP MCU 8KB EPROM | Microchip
PIC17C43T-25I/PQ

PIC17C43T-25I/PQ - 8-bit 25MHz OTP MCU 8KB EPROM | Microchip

The Microchip Technology PIC17C43T-25I/PQ is a high-performance 8-bit CMOS EPROM/ROM microcontroller in the PIC17C family, delivering 8.25 MIPS throughput at a 25 MHz clock input and housed in a 44-pin MQFP (10x10 mm) package. It integrates 8 KB (4K x 16) of One-Time-Programmable (OTP) program memory, 454 bytes of data RAM, and 33 general-purpose digital I/O pins. An MCU (microcontroller) is a single-chip computer that combines a CPU core, program and data memory, peripherals, and I/O on one die. The PIC17C43 belongs to the 8-bit PIC family, itself part of the broader microcontroller / embedded controller / semiconductor hierarchy. Within Microchip's lineup, PIC17C5x sits above PIC16C5x and below PIC18 in capability, offering an extended instruction set with only 58 single-word instructions to learn. Key features include a 121 ns single-cycle instruction execution (program branches and table reads/writes are two-cycle), an operating voltage range of 4.5 V to 6 V, an industrial temperature grade of -40 C to +85 C, and an 8-level hardware stack. The device provides multiple peripherals: a 16-bit timer/counter with prescaler, capture/compare/PWM modules, an 8-bit A/D converter, a USART, and a synchronous serial port (SSP) for SPI/I2C communication. The PIC17C43 uses a RISC Harvard architecture with separate program and data paths, enabling simultaneous instruction fetch and data access. The 16-bit-wide instruction word and 8-bit data bus yield efficient code density, while the integrated watchdog timer and power-on reset improve system robustness in noisy industrial environments. Typical applications include industrial automation controllers, motor control, automotive subsystems, consumer electronics, and embedded control where OTP programmability and 8-bit simplicity are preferred over larger flash-based MCUs. Its 33 I/O pins support direct interfacing to keypads, displays, sensors, and power switches. When designing with this part, plan for OTP programming: the device cannot be re-flashed in-circuit, so code must be validated before commitment. An erasable CERDIP variant (JW package) exists for development. Adequate decoupling and oscillator layout are essential for the high-frequency 25 MHz operation. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC17C43T-25I/PT - 8-bit OTP MCU 8KB EPROM 25MHz TQFP-44 | Microchip
PIC17C43T-25I/PT

PIC17C43T-25I/PT - 8-bit OTP MCU 8KB EPROM 25MHz TQFP-44 | Microchip

The Microchip Technology PIC17C43T-25I/PT is a high-performance 8-bit CMOS EPROM/ROM microcontroller featuring 8 KB of on-chip One-Time-Programmable (OTP) program memory, a 25 MHz maximum clock input, and 454 bytes of general-purpose RAM, all housed in a 44-pin TQFP (PT) surface-mount package delivered on tape-and-reel. The 'T' suffix indicates tape-and-reel packaging, the '25' indicates the 25 MHz speed grade, the 'I' indicates an industrial operating temperature range, and the '/PT' suffix confirms the TQFP-44 footprint. According to the Microchip datasheet, the device executes most instructions in a single 121 ns instruction cycle (excluding program branches and table reads/writes, which require two cycles), and it can deliver up to 8.25 MIPS throughput at the 33 MHz clock ceiling of the PIC17C43 family. An 8-bit microcontroller (MCU) is a self-contained computing element built around an 8-bit data path, on-chip program memory, on-chip data RAM, and a set of peripherals such as timers, capture/compare/PWM modules, USARTs, and I/O ports. The PIC17C43 sits at the top of the original PIC17C family - a high-performance extension of the PIC16 mid-range line - and was Microchip's first PIC architecture to feature a 16-bit instruction word with 8-bit data, hardware multiply, multiple interrupt sources, and a 16-level hardware stack. It belongs to the broader hierarchy: microcontroller -> embedded controller -> semiconductor -> integrated circuit. Key differentiating features include only 58 single-word instructions to learn (simplifying firmware development), a 25 MHz external clock input yielding a 160 ns instruction cycle, an instruction set with hardware multiply, four interrupt sources, a 16-level deep hardware stack, and 33 I/O pins (in the 44-pin TQFP). The architecture also incorporates a 4x phase-locked loop option on some family members, hardware USART, multiple timer/counter blocks, and capture/compare/PWM modules suited to real-time embedded control. The PIC17C43 is built on a CMOS EPROM process, allowing prototype and low-volume production programming with a windowed or OTP package. Industrial-temperature silicon ensures operation across -40 C to +85 C. Typical applications include industrial automation controllers, motor-control front-ends, instrumentation, automotive body and chassis modules (non-safety), embedded data-acquisition front-ends, and legacy embedded control designs that must be maintained or replaced part-for-part during long-lifecycle product support. Microchip recommends the newer PIC18F4220 as a modern migration path for new designs. When designing with this part, treat the OTP window carefully: the PIC17C43T ships as one-time-programmable, so code must be fully verified before production programming. Use the 44-pin TQFP land pattern exactly as published by Microchip, allow bulk decoupling near VDD/VSS pairs, and ensure the oscillator load capacitors match the chosen crystal. For new designs, evaluate the PIC18F family first; for legacy board repairs, the PIC17C43T-25I/PT remains a direct, footprint-compatible option.

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PIC17C43T-33/PT - 8-bit 33MHz OTP MCU 8KB 44-TQFP | Microchip
PIC17C43T-33/PT

PIC17C43T-33/PT - 8-bit 33MHz OTP MCU 8KB 44-TQFP | Microchip

The Microchip Technology PIC17C43T-33/PT is a high-performance 8-bit CMOS EPROM/ROM microcontroller built on Microchip's PIC17C architecture, delivering 8.25 MIPS at a 33 MHz clock input with a 121 ns instruction cycle, housed in a 44-pin TQFP surface-mount package. It integrates 8 KB of One-Time Programmable (OTP) program memory organized as 4K x 16 and 454 bytes of general-purpose RAM, alongside 33 general-purpose I/O pins and a 16-bit data bus. An 8-bit microcontroller (MCU) is a small computer-on-a-chip that combines a CPU, program memory, RAM, and peripheral interfaces (UART, timers, I/O) on a single die. The PIC17C family sits above the legacy PIC16C5X in Microchip's taxonomy (PIC17C -> PIC16C -> PIC12C), targeting higher-performance applications that exceed what simpler PIC16 designs can deliver while retaining upward code compatibility. The PIC17C43 uses Harvard architecture with separate program and data buses, an 8.25 MIPS CPU core, and 58 single-word instructions. Key features include 58 single-word instructions for fast code development, single-cycle execution for most instructions (with two cycles only for program branches and table reads/writes), a 16-level hardware stack for subroutine nesting, and a 4.5 V to 5.5 V supply range. The PIC17C43T-33 commercial-temperature device runs from 0C to +70C and offers multiple oscillator modes including RC, XT, HS, and external clock input. Eight analog comparator inputs (shared with digital I/O) provide mixed-signal capability. Typical applications include industrial control systems, automotive body electronics, motor control, sensor signal conditioning, low-end embedded instrumentation, and consumer appliances that require more compute than a PIC16C but do not justify migration to PIC18. The 44-TQFP package offers a compact 10x10 mm footprint suitable for space-constrained designs while still exposing all 33 I/O pins. When designing with the PIC17C43, plan OTP programming into your production flow because OTP parts cannot be reprogrammed in-circuit. The PIC17C43 is now legacy; Microchip recommends migrating to PIC18F4220 for new designs. All cross-references and replacements identified below share the 44-TQFP footprint or differ only in temperature grade and speed bin. This page synthesizes verified distributor pricing, drop-in alternatives limited to the 44-TQFP footprint, and design notes that supplement the original Microchip datasheet for engineers evaluating long-term availability of the PIC17C43 family.

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PIC17C43T-33E/PT - 8-bit 33MHz 8KB OTP MCU 44-TQFP | Microchip
PIC17C43T-33E/PT

PIC17C43T-33E/PT - 8-bit 33MHz 8KB OTP MCU 44-TQFP | Microchip

The Microchip Technology PIC17C43T-33E/PT is an 8-bit CMOS OTP-based microcontroller from the PIC® 17C family, delivering 8.25 MIPS performance with a 121 ns instruction execution time, 8KB (4K x 16) of One-Time-Programmable program memory, 454 x 8 bytes of RAM, and 33 digital I/O pins, housed in a 44-pin TQFP (10x10 mm) surface-mount package. The device operates at a maximum clock speed of 33 MHz and supports an external oscillator input, making it suitable for high-performance embedded control applications. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/OTP/Flash), data memory (RAM), and peripherals onto one silicon die. The PIC17C43T belongs to Microchip's PIC® 17C family, a high-performance tier of the broader PIC architecture tree (PIC -> 8-bit MCU -> microcontroller -> embedded IC -> semiconductor). The '17C' lineage was Microchip's most capable 8-bit family before the PIC18 introduction, offering the highest code density and peripheral count in the classic 8-bit portfolio. PIC17C parts use 16-bit-wide instruction words and were typically deployed in motor control, instrumentation, and industrial automation designs where an 8-bit core was preferred for cost and toolchain familiarity. Key features of the PIC17C43T-33E/PT include the extended industrial temperature grade (E suffix, -40C to +125C), 33 I/O pins for interfacing to peripherals, hardware multiplier for fast arithmetic, multiple 16-bit timer/counters, a USART, and an instruction set of only 58 single-word instructions for fast code development. The 'T' suffix denotes tape-and-reel packaging for high-volume assembly. The OTP memory is one-time-programmable, requiring mask-programmed equivalents (PIC17CR43) for volume production runs after code freeze. Architecturally, the PIC17C43T uses a RISC-style Harvard architecture with separate program and data buses. Its 33 MHz maximum clock delivers 121 ns instruction cycles, enabling deterministic interrupt response - a hallmark of PIC microcontrollers. The device integrates brown-out detection, a watchdog timer, and in-circuit serial programming (ICSP) support for production-line programming. Typical applications include industrial motor control, instrumentation and metering, automotive body electronics (non-safety), HVAC controllers, and embedded control subsystems where deterministic real-time response is required. The 33 I/O count supports direct interfacing to keypads, displays, sensors, and power-stage FET drivers. When designing with the PIC17C43T-33E/PT, note that OTP memory cannot be erased - prototype carefully and plan for PIC17C44 or PIC18F alternatives during code development. The 5V nominal supply and 33 MHz operation require careful PCB layout for EMI control. This page synthesizes distributor pricing, drop-in same-package alternatives, and engineering design notes for engineers evaluating the PIC17C43T-33E/PT for legacy or new designs.

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PIC17C43T-33I/L - 33MHz 8-bit OTP MCU, 8KB, 44-PLCC | Microchip
PIC17C43T-33I/L

PIC17C43T-33I/L - 33MHz 8-bit OTP MCU, 8KB, 44-PLCC | Microchip

The Microchip Technology PIC17C43T-33I/L is a high-performance 8-bit CMOS OTP-based microcontroller from the PIC17C family, delivering 8.25 MIPS at a 33 MHz clock input with a 121 ns single-cycle instruction execution time. The device integrates 8 KB (4K x 16) of OTP program memory, 33 general-purpose I/O lines, and operates from a 4.5 V to 6 V supply, all housed in a 44-pin PLCC (Plastic Leaded Chip Carrier) J-lead package. A microcontroller (MCU) is a single-chip computer that contains a processor core, program memory, RAM, and programmable I/O peripherals. The PIC17C43 belongs to the OTP (One-Time-Programmable) ROM-based MCU family within Microchip's PIC microcontroller taxonomy: PIC17C -> 8-bit PIC -> PIC microcontroller -> microcontroller -> semiconductor -> integrated circuit. This hierarchy places it above simple 8-bit cores but below flash-memory families in upgrade flexibility. Key features include only 58 single-word instructions to learn, two-cycle program branches and table reads/writes, hardware multiplier, 16-bit data bus, multiple timer/counter modules, and an industry-standard PIC16C5X/PIC16CXX upward-compatible instruction set. The 'T' suffix denotes tape-and-reel packaging, and 'I' denotes the industrial temperature grade of -40 C to +85 C. The 33 MHz speed code indicates a 121 ns instruction cycle. Architecturally, the PIC17C43 employs a RISC-based Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and data access. This dual-bus design is what allows the 121 ns single-cycle execution throughput. The OTP memory is programmed once via Microchip's standard device programmer and cannot be erased, making the part suitable for production-cost-sensitive, low-volume, or fixed-code designs. Typical applications include industrial automation controllers, consumer electronics appliances, automotive subsystems, white-goods motor control, and embedded control where fixed firmware is acceptable. Because OTP memory cannot be field-updated, design teams typically prototype with a windowed (JW) variant and move to OTP for production. When designing with this device, remember that OTP parts cannot be re-programmed in-circuit. Engineers targeting the same PLCC-44 footprint but requiring flash memory should evaluate Microchip's suggested replacement, the PIC18F4220, which offers in-system programmability. The 33 MHz rating requires careful PCB layout for the clock trace and decoupling at each supply pin.

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PIC17C43T-33I/PQ - 8KB OTP 8-bit MCU 33MHz 44-MQFP | Microchip
PIC17C43T-33I/PQ

PIC17C43T-33I/PQ - 8KB OTP 8-bit MCU 33MHz 44-MQFP | Microchip

The Microchip Technology PIC17C43T-33I/PQ is a high-performance 8-bit CMOS EPROM/ROM microcontroller from the PIC17C family, featuring 8KB (4K x 16) of One-Time Programmable (OTP) program memory and operating at up to 33 MHz clock input in a 44-pin MQFP (10x10 mm) surface-mount package. It executes instructions in a 121 ns single cycle (except program branches and table read/writes which are two-cycle) and is built on Microchip's enhanced PIC® RISC architecture with 58 single-word instructions, delivering up to 8.25 MIPS throughput. The device is rated for the industrial temperature grade (-40C to +85C) and includes 454 bytes of general-purpose RAM. An 8-bit microcontroller is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral I/O on one die. Within the broader taxonomy, the PIC17C43 belongs to the 8-bit MCU class -> microcontroller -> embedded controller -> semiconductor. Compared with PIC16C5X/PIC16CXX predecessors, the PIC17C family adds an expanded instruction set, larger memory addressing, and additional peripheral integration, making it suitable for higher-end embedded applications than baseline PIC16 devices can address. Key features include a Harvard architecture with separate program and data buses, multiple power-saving modes, selectable oscillator options (crystal/ceramic resonator), and a versatile interrupt controller supporting both internal and external interrupt sources. The 33 MHz clock yields the 121 ns instruction cycle that powers 8.25 MIPS throughput, while the OTP program memory provides flexible in-system reprogrammability during prototyping and small-batch production. The 33I/PQ suffix indicates 33 MHz speed, industrial temperature, tape-and-reel packaging, and the 44-pin MQFP plastic package. Typical applications include industrial control loops, motor control front-ends, automotive body/comfort subsystems (predecessor grade), consumer appliance controllers, security panel logic, and general-purpose 8-bit embedded platforms where a balance of throughput, ROM density, and I/O count is required. Its PIC17 heritage gives drop-in compatibility with designs migrated from PIC16CXX or earlier PIC17C42 systems. One important design consideration: Microchip has officially flagged the PIC17C43 as a legacy device and recommends the PIC18F4220 as a newer alternative. Engineers building new products should evaluate the PIC18F family for additional features, flash memory, and ongoing support, while still sourcing PIC17C43T-33I/PQ for existing design maintenance and production continuity. This PIC17C43T-33I/PQ product page synthesizes distributor availability, MQFP-package drop-in alternatives from the same PIC17C family, and practical design notes not aggregated on the manufacturer datasheet itself, helping engineers and procurement teams evaluate lifecycle risk and second-source options in a single view.

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PIC17C44-16/PQ - 16MHz 8-Bit OTP MCU, 16KB | Microchip
PIC17C44-16/PQ

PIC17C44-16/PQ - 16MHz 8-Bit OTP MCU, 16KB | Microchip

The Microchip Technology PIC17C44-16/PQ is a high-performance 8-bit CMOS EPROM/ROM microcontroller (MCU) that executes 58 single-word instructions at up to 16 MHz, delivering 8.25 MIPS with a 121 ns instruction cycle. Housed in a 44-pin MQFP package (10x10 mm, plastic quad flat pack), the device integrates 16 KB of one-time-programmable (OTP) program memory organized as 8K x 16 words, plus on-chip RAM and peripherals for embedded control applications. A microcontroller (MCU) is a single-chip computer that combines a CPU core, non-volatile program memory (ROM/Flash/EPROM), volatile data memory (RAM), and programmable I/O peripherals. The PIC17C44 belongs to Microchip's PIC17C family, an early high-end 8-bit RISC architecture positioned above the PIC16C and below the PIC18 generations. It uses a Harvard bus (separate program and data memory) with a 16-bit instruction word, which is the defining trait of the PIC17C family versus the 14-bit PIC16C and 12-bit PIC14C predecessors. Key features of the PIC17C44-16/PQ include 33 single-cycle instructions plus 23 two-cycle branches/table reads, 16 level hardware stack, multiple timer/counter modules, synchronous/asynchronous serial port (USART), capture/compare/PWM peripherals, 33 digital I/O pins, and a commercial 0C to +70C operating temperature grade. Power consumption is managed via Run, Idle, and Sleep modes, with low-power Sleep current suitable for battery-backed designs. Architecturally, the PIC17C44 uses Microchip's RISC instruction set tuned for deterministic single-cycle execution and bit-manipulation efficiency, supported by a wide 16-bit instruction bus and a dedicated hardware multiplier. The OTP program memory allows prototype-to-production deployment using the same silicon, with EPROM-windowed siblings for code development. Typical applications include industrial motor control, HVAC actuators, security and alarm panels, point-of-sale terminals, instrumentation, and embedded control boards where deterministic 8-bit performance and Microchip ecosystem maturity outweigh the need for flash memory. Designers should budget 121 ns per instruction in real-time loops and use the USART plus CCP peripherals to offload the CPU. When designing with this device, evaluate firmware lifecycle (OTP requires a one-shot programming flow) and confirm the recommended modern replacement (PIC18F442) only if drop-in compatibility is not required, since the PIC18F family uses a different instruction set and is not code-compatible with PIC17C sources.

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PIC17C44-16E/L - 16MHz 8-bit OTP MCU 16KB Flash | Microchip | Industrial
PIC17C44-16E/L

PIC17C44-16E/L - 16MHz 8-bit OTP MCU 16KB Flash | Microchip | Industrial

The Microchip Technology PIC17C44-16E/L is an 8-bit RISC CMOS OTP microcontroller from the PIC17C family, delivering 16 MHz core speed and 8.25 MIPS throughput with a 121 ns instruction cycle, in a 44-pin PLCC (J-Lead, 16.59x16.59 mm) package. An 8-bit microcontroller (MCU) is a single-chip computer that integrates an 8-bit CPU, program memory, RAM, peripherals, and I/O on one die. The PIC17C family sits at the top of Microchip's legacy 8-bit portfolio: it is upward-compatible with the PIC16C5X/PIC12CXXX/PIC16CXX instruction sets and adds a 16-bit-wide program memory bus, an 8-level hardware stack, and a multiplier for higher arithmetic throughput. The PIC17C44 is the entry-point of the family with 16 KB of One-Time-Programmable (OTP) program memory and 454 bytes of general-purpose RAM. Key features include 16 KB (8K x 16) OTP program memory, 454 x 8 bits of data RAM, 33 programmable digital I/O pins, an external oscillator interface, and an extended (-40C to +125C) operating temperature range denoted by the "E" suffix. The device is built on a CMOS process and offers low power consumption typical of PIC architecture, with industry-standard peripherals including timers, a USART, and capture/compare/PWM modules. The PIC17C44-16E/L uses a Harvard architecture with a separate 16-bit program memory bus and 8-bit data bus, enabling single-cycle instruction fetch and efficient execution. The high-performance register file and 8-level deep hardware stack support fast context switching for interrupt-driven firmware. PIC17C44 firmware is supported by Microchip's MPLAB X IDE and the legacy MPASM assembler toolchain. Typical applications include industrial control systems, motor control front-ends, security and access control panels, instrumentation front-ends, and embedded control in legacy automotive subsystems. The 33 I/O lines make it well suited for keypad-scanning, LED multiplexing, and parallel bus interfaces to character LCDs. Designers migrating production from PIC17C44 should evaluate Microchip's recommendation: the PIC18F442, which provides flash memory, more peripherals, and a modern toolchain at a comparable price. When designing with this part, note that OTP memory requires programming at the factory or with a production-grade programmer; field firmware updates are not possible. Use the "E" (extended) variant only when the application truly requires -40C to +125C operation - the standard "I" industrial variant is usually sufficient and easier to source. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet, with cross-references to functional equivalents in the PIC17C44 family and recommended migration paths to modern PIC18F devices.

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PIC17C44-16E/PQ - 16KB OTP 8-bit MCU 16MHz 44-MQFP | Microchip
PIC17C44-16E/PQ

PIC17C44-16E/PQ - 16KB OTP 8-bit MCU 16MHz 44-MQFP | Microchip

The Microchip Technology PIC17C44-16E/PQ is a high-performance 8-bit CMOS OTP microcontroller from the PIC17C family, operating at up to 16 MHz with 8.25 MIPS (121 ns instruction execution) and packaged in a 44-pin MQFP (10x10 mm). It integrates 16 KB of OTP program memory (8K x 16 words) and 454 bytes of general-purpose RAM, with 33 digital I/O pins suitable for embedded control applications. A microcontroller (MCU) is a single-chip computer that contains a processor core, non-volatile program memory (here One-Time-Programmable OTP), volatile data memory, and peripheral interfaces. The PIC17C family sits above the PIC16C5X/PIC12CXXX/PIC16CXX families in Microchip's 8-bit hierarchy in performance and on-chip resources while remaining source-code compatible at the instruction level. OTP microcontrollers are programmed once with the application firmware and retain the code permanently, making them suited to high-volume production where re-programmability is not required. Key features of the PIC17C44-16E/PQ include an enhanced 8-bit PIC RISC core with only 58 single-word instructions, a multi-source interrupt controller, a hardware multiply unit, and dual 8-bit timer/counters with capture/compare/PWM capability. The device supports both parallel and serial programming modes and offers an extended operating temperature range (industrial grade, indicated by the 'E' suffix) from -40C to +125C. The PIC17C44 architecture combines a 16-bit instruction word with an 8-bit data path, enabling 121 ns minimum instruction cycle at 16 MHz while keeping peripheral register access byte-oriented. Hardware stack depth supports deep subroutine nesting and the device includes dedicated peripheral I/O mapping for direct port manipulation. Compared to PIC16C-series predecessors, the PIC17C44 adds a second timer, additional interrupt sources, and a wider program counter for addressing up to 64 KB of program memory space. Typical applications include industrial control systems, motor control, instrumentation, and high-end embedded control where PIC16C devices lack either memory depth, I/O count, or interrupt capability. The 33 I/O pins and 16 KB of code space comfortably support mid-complexity automation tasks. When designing with the PIC17C44, note that OTP parts cannot be re-programmed in-circuit; development should be performed on a windowed (JW) variant first. A 'PQ' suffix denotes the 44-pin MQFP plastic package, which requires standard SMT reflow profiles. This page synthesizes distributor pricing, lifetime-buy alternatives, and drop-in replacement options not found in the manufacturer datasheet.

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PIC17C44-16E/PT - 8-bit 16MHz 16KB OTP MCU 44-TQFP | Microchip
PIC17C44-16E/PT

PIC17C44-16E/PT - 8-bit 16MHz 16KB OTP MCU 44-TQFP | Microchip

The Microchip PIC17C44-16E/PT is an 8-bit CMOS OTP-based microcontroller from the PIC17C family, operating at up to 16 MHz with 8.25 MIPS (121 ns instruction execution), housed in a 44-pin TQFP (10x10 mm) package. It integrates 16 KB of OTP program memory (organized as 8K x 16) and 454 bytes of general-purpose RAM, with the 'E' suffix denoting the extended industrial temperature grade of -40C to +125C and a 16 MHz maximum clock. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, integrating a CPU core, program memory (ROM/Flash/OTP), data RAM, and peripherals such as timers, communication ports, and I/O pins. The PIC17C family sits within Microchip's PIC microcontroller hierarchy as a high-performance tier above the baseline PIC16C/PIC12C families, sharing upward code compatibility while adding a wider instruction set (58 single-word instructions), hardware multiply, and a more capable interrupt structure. MCUs belong to the broader semiconductor hierarchy: microcontroller -> embedded processor -> integrated circuit -> semiconductor. Key features include the PIC RISC architecture with single-cycle instruction execution (except branches), a hardware multiplier, multiple timer/counter modules, synchronous/asynchronous serial port (USART), and a priority interrupt controller. The OTP program memory allows one-time programmable firmware storage suited to mature, production-locked designs. Architecturally, the PIC17C44 uses a Harvard-style memory layout with separate program and data buses, allowing simultaneous instruction fetch and data access. The 16-bit instruction word (8K x 16) yields compact, deterministic code, while the 8-bit data path keeps register and ALU operations efficient for control-oriented tasks. Brown-out reset, watchdog timer, and power-saving SLEEP mode enhance field robustness. Typical applications include industrial control systems, embedded instrumentation, motor control front-ends, sensor interfacing, and legacy OEM products whose firmware has been finalized. The extended temperature grade makes the 'E' variant suitable for outdoor, automotive under-hood, and factory-floor deployments where commercial-grade parts would fail. When designing with this part, note that OTP memory cannot be reprogrammed in-circuit; an ICD (In-Circuit Debugger) socket or a flash-based PIC17C/18F equivalent should be used for development. Confirm supply longevity: the Microchip product page recommends the PIC18F442 as a modern alternative. This page synthesizes current distributor pricing, drop-in compatible alternatives, and design notes not found in the manufacturer datasheet alone.

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PIC17C44-16I/L - 8-Bit 16MHz 16KB OTP MCU, 44-PLCC | Microchip
PIC17C44-16I/L

PIC17C44-16I/L - 8-Bit 16MHz 16KB OTP MCU, 44-PLCC | Microchip

The Microchip Technology PIC17C44-16I/L is a high-performance 8-bit CMOS EPROM/ROM microcontroller from the PIC17C family, operating at 16 MHz with 16 KB (8K x 16) of one-time-programmable (OTP) program memory, housed in a 44-pin PLCC (J-Lead) package with industrial temperature grading (-40C to +85C). A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and programmable I/O peripherals on one silicon die. The PIC17C family sits above the PIC16CXX mid-range line and below the PIC18F enhanced family in Microchip's 8-bit portfolio, offering approximately 8.25 MIPS (121 ns instruction cycle) throughput and only 58 single-word instructions while remaining upward compatible with PIC16C5X, PIC12CXXX, and PIC16CXX code. It belongs to the broader category of embedded microcontrollers, semiconductor ICs, and computing platforms. Key features of the PIC17C44 include 33 programmable digital I/O pins, a 16-bit data bus architecture, multiple timer/counter modules, a versatile USART, and 454 bytes of general-purpose RAM for data storage. The supply voltage range of 4.5 V to 6.0 V is well suited to legacy 5 V industrial designs. The /L suffix denotes the 44-lead PLCC (Plastic Leaded Chip Carrier) J-lead surface-mount package with square body shape (package code QCCJ). The architecture is a RISC-based Harvard design with separate program and data paths, a deep hardware stack, and built-in interrupt controller. The OTP program memory allows prototype-to-production code flexibility, and the UV-erasable CERDIP option (-JW suffix) supports field development. Microchip documentation explicitly recommends the newer PIC18F442 as a migration target for new designs. Typical applications include industrial control and monitoring systems, motor drive controllers, smart sensor hubs, and embedded data-acquisition front-ends. The wide I/O count (33 pins) and 16 KB code space make it well suited to protocol-conversion bridges, multi-channel instrumentation, and human-machine interface (HMI) panels. When designing with this part, note that the PIC17C44 is mature and being phased out by Microchip in favor of PIC18F/PIC24 alternatives; designers should validate long-term availability. The OTP memory cannot be re-programmed in-circuit, so production programming must be planned. Always observe the VCC decoupling layout per Microchip's application notes for PIC17C family noise immunity. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found on a single manufacturer page. Sources include Octopart, Heisener, DigiKey, and Microchip's product family documentation. Cross-brand drop-in equivalents are uncommon because the PIC17C44 occupies a specialized industrial niche; same-family speed and temperature variants are the most reliable replacements.

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PIC17C44-16I/P - 8-bit 16MHz 16KB OTP MCU | Microchip
PIC17C44-16I/P

PIC17C44-16I/P - 8-bit 16MHz 16KB OTP MCU | Microchip

The Microchip Technology PIC17C44-16I/P is an 8-bit RISC microcontroller from the PIC17C family, delivering 8.25 MIPS (121 ns instruction execution) from a 16 MHz oscillator in a 40-pin PDIP through-hole package. It integrates 16 KB of one-time-programmable (OTP) program memory organized as 8K x 16 words, 454 bytes of RAM, and 33 digital I/O pins, and operates from a 3.0 V to 5.5 V supply across the industrial -40C to +85C temperature range. The 'I' suffix denotes the industrial temperature grade and the '/P' suffix denotes the 40-pin PDIP package. A microcontroller (MCU) is a single-chip computer containing a CPU core, non-volatile program memory, working RAM, and programmable peripherals. The PIC17C44 belongs to the high-performance tier of Microchip's 8-bit PIC architecture, positioned above PIC16C5X and PIC12CXXX families while remaining upwards source-compatible with the PIC16CXX mid-range family. This hierarchy of 8-bit MCU -> RISC microcontroller -> embedded controller -> semiconductor gives the part its place in modern embedded designs where deterministic instruction timing and simple development matter more than raw compute throughput. Key features include 58 single-word instructions, an 8-level hardware stack, a multiplier for signed/unsigned arithmetic, four counter/timer modules, a USART, two capture/compare/PWM modules, and a watchdog timer with its own on-chip RC oscillator. The OTP EPROM program memory allows prototype-to-production migration with the same die, while the CMOS process keeps typical supply current under 15 mA at 5 V. The 16 MHz clock at 4:1 internal division yields the 4 MHz instruction rate quoted in older literature; at 16 MHz oscillator / 4 the instruction rate is 4 MHz (250 ns), and the 16 MHz MIPS figure Microchip publishes reflects 1:1 instruction-cycle counting in this family. Typical applications include industrial control, motor drive front-ends, instrumentation, security panels, and embedded designs that require deterministic 8-bit control with simple OTP-based code storage. The wide supply range and -40C to +85C operation support factory-floor and outdoor enclosures. Although Microchip recommends migrating new designs to PIC18F442 for flash-based reprogrammability, the PIC17C44 remains in service for long-lifecycle products and legacy board rework where OTP and pinout compatibility matter. When designing with this part, remember that OTP parts cannot be reprogrammed in-circuit and require a UV-windowed CERDIP variant (e.g. PIC17C44-16I/L) for development. Plan a separate programming step using a Microchip or third-party device programmer before PCB conformal coating, and budget for a programming-test yield loss of typically 1-3 percent on first articles.

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PIC17C44-16I/PQ - 8-bit 16MHz 16KB OTP MCU | Microchip PIC17C44
PIC17C44-16I/PQ

PIC17C44-16I/PQ - 8-bit 16MHz 16KB OTP MCU | Microchip PIC17C44

The Microchip Technology PIC17C44-16I/PQ is a high-performance 8-bit CMOS EPROM/ROM microcontroller in the PIC17C family, delivering 8.25 MIPS (121 ns instruction execution) at a 16 MHz clock in a 44-pin MQFP (10x10 mm) package. It integrates 16 KB of one-time-programmable (OTP) program memory organized as 8K x 16 words, 454 bytes of general-purpose RAM, and 33 digital I/O pins, all operating from a single 5 V supply. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, integrating a CPU core, program memory, data RAM, and peripherals (timers, I/O, serial, ADC) into one package. The PIC17C44 belongs to the broader MCU hierarchy: PIC17C family -> PIC16/PIC17 high-end 8-bit -> 8-bit MCU -> microcontroller -> embedded processor. The "16" suffix in the part number denotes 16 MHz maximum clock, and the "I" denotes the industrial temperature grade (-40C to +85C). Key features include the PIC17 RISC architecture with only 58 single-word instructions, a hardware multiply and divide engine (rare in 8-bit MCUs), 4 analog comparators, 3 timer/counters, a 16-bit watchdog timer, and synchronous/asynchronous serial port (USART) capability. Brown-out reset and power-on reset are integrated, simplifying field deployments. The 44-MQFP package and 5V-only operation suit industrial control boards with established power-rail designs. This device uses Microchip's EPROM/ROM-based CMOS process with an OTP windowless program memory option, and its 16-bit instruction word plus hardware multiplier distinguish it from the smaller-footprint PIC16 family. The PIC17C architecture closes the performance gap between classic 8-bit MCUs and early 16-bit controllers in real-time control loops. Typical applications include industrial motor control, HVAC controls, and consumer appliance control boards. According to the manufacturer product page, the recommended modern replacement is the PIC18F442. Because the PIC17C44 has been discontinued, design reuse across existing 17C44-based PCBs is supported by several PIC17C family speed and temperature variants in the same 44-MQFP footprint. When designing with this part, note that the OTP memory cannot be reprogrammed in-circuit; a windowed ceramic package is required for prototype erasing. The industrial temperature grade from -40C to +85C supports harsh-environment deployment but excludes automotive AEC-Q100 qualification. This page synthesizes distributor availability, drop-in 44-MQFP alternatives, lifecycle status, and practical design notes for engineers evaluating this legacy MCU for new designs or sustaining existing production.

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PIC17C44-16I/PT - 8-Bit 16MHz 16KB OTP MCU, 44-TQFP | Microchip
PIC17C44-16I/PT

PIC17C44-16I/PT - 8-Bit 16MHz 16KB OTP MCU, 44-TQFP | Microchip

The Microchip Technology PIC17C44-16I/PT is a high-performance 8-bit CMOS EPROM/ROM microcontroller in the PIC17C family, delivering 16 MIPS at a 16 MHz clock input and packaged in a 44-pin TQFP (PT) surface-mount package. The device integrates 16 KB of one-time-programmable (OTP) program memory (8K x 16 words), 454 bytes of general-purpose RAM, and 33 digital I/O pins, with a 16-bit wide data bus architecture and Harvard RISC core executing 58 instructions in single cycles. An 8-bit microcontroller (MCU) is a single-chip processor with an 8-bit data path, integrated program memory, RAM, and peripherals designed for deterministic control tasks. Within the broader semiconductor hierarchy, an MCU sits under microcontroller -> embedded processor -> semiconductor device, and the PIC17C44 family sits at the upper end of Microchip's 8-bit portfolio, between the PIC16 mid-range and PIC18 enhanced families. The PIC17C44 is the OTP-programmable variant of the family; the original windowed (UV-erasable) die is also sold as PIC17C44/JW for development. Key specifications include a 16 MHz maximum oscillator input with 121 ns minimum instruction cycle, supply voltage range of 4.5 V to 6.0 V, and industrial-grade -40 °C to +85 °C operating temperature range. The part exposes 33 I/O pins, a hardware USART, multiple timers, and a programmable EPROM program memory, providing a complete control platform without external memory expansion. The 'I' suffix denotes the industrial temperature grade and 'PT' denotes the plastic TQFP-44 package. The architecture uses a 16-bit-wide program memory bus and Harvard structure to fetch instructions and data in parallel. Most instructions execute in a single 121 ns cycle (8.25 MIPS sustained), with only program branches and table reads/writes requiring two cycles. This RISC-style pipeline, combined with a small 58-instruction opcode set, gives the PIC17C44 deterministic interrupt response time well-suited to real-time control loops. Typical applications for the PIC17C44-16I/PT include industrial motor and process control, HVAC and appliance controllers, automotive body electronics (non-safety), and embedded instrumentation front-ends. The wide supply range and 33 I/O pins make it a direct fit for keypad scanning, LED/LCD driving, sensor interfacing, and PWM-actuated actuator control. When designing in this device, confirm the OTP-only memory model fits your production flow: windowed (JW) samples are required for prototype code iteration, and a final masked-ROM (PIC17CR44) spin is available for high-volume runs. Microchip's MPLAB IDE and PICSTART-Plus / PRO MATE II programmers support the family natively. This page consolidates distributor stock and pricing, drop-in PIC17C44 family variants, and practical engineering notes not repeated verbatim in the Microchip datasheet, giving procurement and design engineers a single point of decision.

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PIC17C44-25/P - 8-Bit 25MHz 16KB OTP MCU 40-DIP | Microchip
PIC17C44-25/P

PIC17C44-25/P - 8-Bit 25MHz 16KB OTP MCU 40-DIP | Microchip

The Microchip Technology PIC17C44-25/P is a high-performance 8-bit CMOS EPROM/ROM microcontroller in a 40-pin PDIP package, delivering 8.25 MIPS (121 ns instruction cycle) at a 33 MHz clock input. It integrates 16 KB of OTP program memory (8K x 16), 454 bytes of RAM, and 33 digital I/O pins, executing 58 single-word instructions in a single cycle except for program branches and table reads/writes, which take two cycles. An 8-bit microcontroller (MCU) is a microprocessor-on-a-chip that combines a CPU, RAM, program memory, and peripheral set into a single integrated circuit, forming the lowest tier of the microcontroller -> embedded controller -> embedded system hierarchy. The "PIC" family is a Harvard-architecture RISC MCU line from Microchip with separate program and data buses. The PIC17C sub-family is the high-end 8-bit tier (above PIC16C and PIC12C), and within the PIC17C line the PIC17C44 is the largest-memory variant alongside PIC17C42/42A/43. The "/P" suffix denotes the PDIP-40 package and "-25" denotes the 25 MHz speed grade. Key features of the PIC17C44 include an 8-level deep hardware stack, 16-bit wide program memory bus (16 KB equals 8K instruction words), 454 bytes of general-purpose RAM, and a 16-bit-wide data path that delivers 8.25 MIPS sustained throughput. The OTP program memory (One-Time Programmable EPROM) is windowless and intended for volume production rather than field re-programming; a windowed CERDIP "JW" variant is available for prototype development. The PIC17C44 family uses a 16-bit instruction word and is upward-compatible with PIC16C5X/PIC12CXXX/PIC16CXX source code, easing migration from smaller 8-bit parts. Typical applications include industrial control systems, motor control, instrumentation, and embedded control boards that need 8-bit performance with moderate on-chip memory. Because it is OTP-only and has been superseded by the flash-based PIC18F442 (per Microchip product page), the PIC17C44-25/P is best suited to mature, long-lifecycle production designs where the original code base is locked and re-qualification is undesirable. When designing with the PIC17C44-25/P, configure MCLR, OSC1/OSC2, and the brown-out reset block per the datasheet, and respect the OTP programming algorithm timing. No external program-memory bus is required because all code lives on-chip. This page synthesizes verified distributor inventory (Heisener reports ~4,224 pieces in stock as of 2026-09-25), parametric data, pin-compatible same-family variants from the PIC17C sub-family, and practical design notes not consolidated in the manufacturer datasheet.

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PIC17C44-25/PQ - 8-Bit 25MHz OTP MCU 16KB | Microchip
PIC17C44-25/PQ

PIC17C44-25/PQ - 8-Bit 25MHz OTP MCU 16KB | Microchip

The Microchip Technology PIC17C44-25/PQ is an 8-bit CMOS OTP-based RISC microcontroller running at 25 MHz with 8.25 MIPS throughput, 16 KB (8K x 16) of One-Time-Programmable program memory and 454 bytes of general-purpose RAM, housed in a 44-pin MQFP (10x10 mm) surface-mount package. It integrates 33 digital I/O lines, an 8-bit data path, and Microchip's PIC17C architecture in a square QFP footprint suitable for through-hole-free industrial assemblies. An 8-bit microcontroller (MCU) is a single-chip computer integrating a CPU, RAM, program memory, peripherals, and I/O on one die, designed to execute embedded control tasks in deterministic cycles. PIC17C parts belong to Microchip's mid-range PIC family, positioned between the PIC16C baseline and PIC18 enhanced cores, with the PIC17C being one of the earliest families to introduce a 16-bit program word and a 16-bit instruction set while retaining an 8-bit data path. Modern replacements like PIC18F442 share the 40/44-pin footprint but migrate to Flash memory. Key specifications include a maximum clock of 25 MHz delivering 121 ns instruction execution, an internal multiplier, multiple timer/counter modules, a USART, and a 12-bit instruction word addressed across 16 KB of OTP. The device supports up to 33 I/O pins and operates from a single 5 V supply. Compared with PIC16C5X predecessors, the PIC17C44 adds a hardware multiplier, expanded interrupt controller, and a 16-level hardware stack, while preserving source-level compatibility for code migrated from PIC16C and PIC12C families. Architecturally, the PIC17C44 uses a Harvard bus with separate program and data paths, enabling single-cycle instruction fetch plus one or two data cycles. The OTP memory is factory- or user-programmed once, providing low per-unit cost in mature production runs but limiting field upgrades. A 25 MHz oscillator and PLL option define the maximum instruction rate; the '25' speed suffix confirms 25 MHz operation versus the 16 MHz '-16' grade. Typical applications include industrial motor control, embedded instrumentation, sensor interfaces, automotive body controllers (legacy), and consumer appliance controllers where deterministic 8-bit control is sufficient. The 44-MQFP footprint also makes it compatible with a broad set of legacy PIC17C/CR sockets when migrating to flash-based PIC18F442 in redesigns. When designing with this part, validate OTP programming flow before committing to a production run - unlike Flash, OTP cannot be reprogrammed and every unit must be discarded for firmware errors.

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PIC17C44-25/PT - 8-Bit CMOS OTP MCU 16KB 25MHz TQFP-44 | Microchip
PIC17C44-25/PT

PIC17C44-25/PT - 8-Bit CMOS OTP MCU 16KB 25MHz TQFP-44 | Microchip

The Microchip Technology PIC17C44-25/PT is a high-performance 8-bit CMOS EPROM/ROM microcontroller delivering 8.25 MIPS at a 25 MHz clock input, housed in a 44-pin TQFP (PT) surface-mount package. It integrates 16KB of One-Time-Programmable (OTP) program memory organized as 8K x 16, executes instructions in a 121 ns single cycle (except program branches and table reads/writes which take two cycles), and operates from a 5V supply. A microcontroller (MCU) is a single-chip computer that contains a processor core, memory, and programmable I/O peripherals. The PIC17C44 belongs to the high-tier PIC17 family of 8-bit MCUs from Microchip - sitting above PIC16 mid-range parts - and is part of the broader PICmicro 8-bit family that pioneered the Harvard RISC architecture for embedded control. OTP variants such as the -25/PT are intended for low-to-medium volume production where field programmability is not required, while still leveraging the PIC instruction set. Key features of the PIC17C44-25/PT include only 58 single-word instructions for fast code development, hardware multiply (8 x 8 in one cycle) inherited from the PIC17 architecture, a 16-level hardware stack for efficient subroutine handling, and compatibility upward from the PIC16C5X, PIC12CXXX, and PIC16CXX device families. The device is rated for the commercial temperature grade and ships in a TQFP-44 surface-mount package with gull-wing leads. From an architectural standpoint the PIC17C44 implements a true RISC design with separate program and data buses. Its 16-bit instruction word supports direct, indirect, and literal addressing modes; combined with hardware multiply this gives substantially higher throughput than PIC16 mid-range parts at the same clock. The '25' speed suffix denotes a 25 MHz maximum oscillator input; the same die is also offered at 33 MHz and with industrial ('I') temperature grades. Typical applications include industrial control, motor drive, automotive body electronics, instrumentation, and general-purpose embedded systems. The Microchip product page recommends considering the PIC18F442 as a newer actively-produced alternative for new designs, while the PIC17C44-25/PT continues to serve legacy production lines and existing PIC17 firmware ports. Compared with PIC16F parts, the PIC17C44 delivers roughly four times the execution throughput, but with higher unit cost and limited in-system programmability. When designing with the PIC17C44-25/PT ensure the VDD decoupling network follows the Microchip PIC17 reference layout, do not exceed 25 MHz at the OSC1 input, and observe the two-cycle penalty for GOTO, CALL, and table-read/write operations when calculating worst-case interrupt latency. A reset supervisor or proper MCLR pull-up is required for reliable cold-start operation. This page synthesizes distributor stock, current unit pricing, package data, and same-family drop-in alternatives not aggregated on any single distributor listing, providing a faster sourcing decision than datasheet parsing alone.

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PIC17C44-25E/P - 8-Bit 25MHz CMOS OTP MCU 16KB | Microchip
PIC17C44-25E/P

PIC17C44-25E/P - 8-Bit 25MHz CMOS OTP MCU 16KB | Microchip

The Microchip PIC17C44-25E/P is a high-performance 8-bit CMOS OTP-based microcontroller delivering 8.25 MIPS (121 ns instruction execution) in a 40-pin PDIP package. It packs 16KB of OTP program memory (8K x 16), 454 bytes of RAM, and 33 general-purpose I/O pins. The "25E" suffix denotes 25 MHz maximum operating frequency at the extended industrial temperature range. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals onto one die. Microcontrollers sit in the embedded computing hierarchy between microprocessors (which need external peripherals) and ASICs (which are application-specific). The PIC17 family specifically bridges the gap between the simpler PIC16 family and higher-end dsPIC devices, targeting complex embedded control with C-friendly architectures and an enhanced instruction set. Key features of the PIC17C44 include an 8-level deep hardware stack, multiply instruction, multiple interrupt sources with prioritized vectored interrupts, four capture/compare/PWM (CCP) modules, a USART with addressable hardware, an 11-channel 8-bit ADC, and a watchdog timer with on-chip RC oscillator. These peripherals deliver a richer feature set than PIC16C5X predecessors while keeping code compatibility upward toward PIC18. The PIC17C44 uses Harvard architecture with separate program and data buses, plus a 16-bit wide program memory path that fetches instructions in a single cycle. This wider path, combined with a 25 MHz clock, is how it attains 8.25 MIPS performance. The wide instruction word also contributes to the relatively large 16KB program memory size for what is otherwise classified as an 8-bit MCU. Typical applications include industrial control systems, motor control (when paired with the CCP/PWM peripherals), appliance controllers, automotive body electronics, security and access systems, and instrumentation front-ends. The wide I/O count of 33 also makes it useful for LED display controllers and keypad-scanning human-machine interfaces. When designing with the PIC17C44-25E/P, ensure the external oscillator network matches the device's 25 MHz rating - a crystal oscillator or ceramic resonator with proper loading capacitors is required. Because this is an OTP (One-Time-Programmable) part, firmware must be fully verified before final programming; there is no field re-programmability. This page synthesizes XAIPART distributor pricing, same-brand drop-in alternatives within the PIC17C family, and practical design considerations not found in the manufacturer datasheet.

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PIC17C44-25E/PQ - 8-Bit 25MHz OTP MCU, 16KB, 44-MQFP | Microchip
PIC17C44-25E/PQ

PIC17C44-25E/PQ - 8-Bit 25MHz OTP MCU, 16KB, 44-MQFP | Microchip

The Microchip Technology PIC17C44-25E/PQ is an 8-bit CMOS OTP (One-Time Programmable) microcontroller from the PIC17C family, running at a 25 MHz external oscillator input with 8.25 MIPS (121 ns instruction execution) throughput, housed in a 44-pin Metric MQFP (PQ) package. What is a PIC17C microcontroller? The PIC17C is Microchip's mid-1990s high-end 8-bit MCU family that extended the classic PIC16C instruction set with additional instructions, multiple interrupt vectors, hardware multiply, and an external program/data bus interface. PIC17C devices sit in the hierarchy: microcontroller -> embedded MCU -> 8-bit MCU -> PIC architecture -> Microchip PIC family. They were the first PIC family to expose an external memory bus and to provide hardware peripheral features that later became standard on PIC18F devices. Key features of the PIC17C44-25E/PQ include 16 KB of OTP program memory (organized as 8K x 16 instruction words), 454 bytes of general-purpose RAM, 33 digital I/O pins, an external oscillator interface, and a wide 4.5V to 6.0V supply range. The "25E" suffix denotes the 25 MHz maximum clock and the Extended (industrial) temperature grade. The "PQ" suffix denotes the 44-pin Metric Quad Flat Package. The PIC17C44 uses Microchip's classic two-stage pipeline and Harvard architecture, with separate program and data buses. Each instruction is 16 bits wide and most execute in a single 121 ns cycle at 25 MHz, giving 8.25 MIPS sustained throughput. The wide OTP program word (16 bits) increases code density relative to 14-bit PIC16C devices. OTP memory is one-time programmable, suitable for production runs where firmware is finalized. Typical applications for the PIC17C44-25E/PQ include industrial control boards, embedded sensor interfaces, motor control peripherals, and legacy replacement designs originally built around the PIC17C4X platform. The part is also used in instrumentation front-ends, security panels, and telecom line-interface modules where the original PIC17C firmware was qualified. Designers often select it to maintain firmware and PCB compatibility with installed PIC17C44 systems. When designing with the PIC17C44, ensure the oscillator source can deliver a clean, jitter-free 25 MHz clock and that the 5V rail stays within the 4.5V to 6.0V supply window. The OTP window is one-time only, so firmware must be fully validated before programming. For new designs, Microchip recommends migrating to the PIC18F442 family, which is source-code compatible and offers in-circuit reprogrammability (Flash). This page synthesizes distributor pricing, parameter cross-checks against the Microchip datasheet, and pin-compatible replacement guidance not found in the original datasheet PDF.

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PIC17C44-25E/PT - 8-Bit 25MHz OTP MCU 16KB | Microchip
PIC17C44-25E/PT

PIC17C44-25E/PT - 8-Bit 25MHz OTP MCU 16KB | Microchip

The Microchip Technology PIC17C44-25E/PT is an 8-bit, OTP (One-Time Programmable) CMOS microcontroller from the legacy PIC17C family, delivering 8.25 MIPS performance (121 ns instruction cycle) at a 25 MHz external clock, and packaged in a 44-pin TQFP (PT) surface-mount form factor. Headline specifications are 16 KB (8K x 16) of OTP program memory, 454 bytes of RAM, 33 digital I/O lines, an external oscillator interface, and a 25 MHz maximum operating frequency. An 8-bit microcontroller (MCU) is a programmable logic device that executes instructions from on-chip program memory and interacts with the outside world through digital I/O, timers, and serial peripherals. In the broader taxonomy, an MCU is a member of the microcontroller class, itself a sub-family of microprocessors (MPU / CPU) that integrate the CPU core, RAM, ROM/Flash, and peripherals on a single die. The PIC17C family, sitting between PIC16C and PIC18 in Microchip's roadmap, was the first 8-bit PIC line to break the 10 MIPS barrier, using a 16-bit instruction word against an 8-bit data path to maximize code density and arithmetic throughput. Key features that distinguish the PIC17C44-25E/PT include its 121 ns single-cycle instruction execution (two-cycle for branches and table reads/writes), a Harvard architecture with separate program and data buses, a four-stage instruction pipeline, and a wide operating voltage range typical of the family. The 'E' suffix indicates the extended industrial temperature grade (-40 °C to +125 °C), making the part suitable for harsh environments outside the commercial 0-70 °C window. The PIC17C architecture is upwards-compatible with the PIC16C5X, PIC12CXXX, and PIC16CXX instruction sets, simplifying firmware portability across Microchip generations. The internal architecture uses a RISC-based instruction set of only 58 single-word instructions, an 8-level hardware stack, and multiple interrupt sources. The wide 16-bit instruction word fetches each opcode in a single cycle, and the data path handles 8-bit arithmetic with dedicated hardware multiply and divide support in later PIC17 derivatives. The PIC17C44 in particular integrates 16 KB of OTP program memory, the largest in the family at introduction. Typical applications include industrial control systems, motor control front-ends, instrumentation, legacy embedded control boards, and any retrofit design that must source an authentic PIC17C44 die for an existing OTP-programmed production line. The 33 I/O pins and the 16-bit timer/counter bank support keypad scanning, LED matrix driving, and parallel sensor aggregation. When designing around this part, note that OTP memory cannot be reprogrammed; engineers typically prototype with a windowed (JW) variant or a pin-compatible flash part such as the PIC18F442 (recommended by Microchip as a functional migration path, although the forum record notes the PIC18F452 is not pin-for-pin compatible). Power, ground, and decoupling capacitor placement must follow the standard PIC17C reference layout to avoid oscillator glitches above 20 MHz.

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PIC17C44-25I/P - 8-Bit 25MHz 16KB OTP MCU 40-PDIP | Microchip
PIC17C44-25I/P

PIC17C44-25I/P - 8-Bit 25MHz 16KB OTP MCU 40-PDIP | Microchip

The Microchip Technology PIC17C44-25I/P is a high-performance 8-bit CMOS EPROM/ROM microcontroller from the PIC17C family, delivering 8.25 MIPS (121 ns instruction execution) in a 40-pin PDIP through-hole package. It features a 25 MHz maximum clock speed, 16 KB (8K x 16) of One-Time-Programmable (OTP) program memory, and operates from a 4.5 V to 6 V supply. According to the Microchip datasheet, the device includes 454 bytes of RAM, 33 digital I/O lines, and the powerful PIC RISC architecture with only 58 single-word instructions, balancing throughput with ease of programming. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and peripheral I/O on one die. The PIC17C family sits at the high end of Microchip's 8-bit hierarchy (PIC10/12/16/17/18), delivering up to 8.25 MIPS performance with a RISC instruction set. The PIC17C44 belongs to the broader embedded microcontroller category within semiconductor ICs, sitting below application processors but above simple discrete logic in capability. Key differentiating specifications include the 25 MHz operating frequency (equivalent to a 121 ns instruction cycle), 16 KB of OTP program memory organized as 8K x 16 words, and a wide 33 I/O count for parallel control applications. The device uses an external clock source and supports interrupt-driven operation with multiple peripheral interfaces typical of the PIC17C series. The PIC17C44 is built on Microchip's CMOS EPROM/ROM process with the PIC17C RISC core, providing faster execution than the earlier PIC16 family while maintaining source-level compatibility with PIC mid-range assembly. Its OTP memory allows one-time field programming for production units, while windowed CERDIP variants (JW package) support development and prototyping with UV erasure. Typical applications include industrial control systems, motor control interfaces, embedded data acquisition, and legacy equipment maintenance. The 33 I/O count suits parallel keypad scanning, LED multiplexing, and discrete logic replacement in factory automation. The OTP memory model is well-matched to mature production designs where firmware is finalized. When designing with this part, verify supply voltage stays within 4.5 V to 6 V and provide adequate decoupling on VDD pins. Note that the PIC17C44 is a mature/legacy product; Microchip recommends the PIC18F442 as the modern migration path, although pinout compatibility is not guaranteed. Plan a board-level migration if long-term availability is critical. This page synthesizes distributor pricing, same-family alternatives, and practical migration notes for the PIC17C44-25I/P that the bare manufacturer datasheet does not provide.

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PIC17C44-25I/PQ - 25MHz 8-bit CMOS OTP MCU, 44-PQFP | Microchip
PIC17C44-25I/PQ

PIC17C44-25I/PQ - 25MHz 8-bit CMOS OTP MCU, 44-PQFP | Microchip

The Microchip Technology PIC17C44-25I/PQ is a high-performance 8-bit CMOS EPROM/ROM-based microcontroller delivering 8.25 MIPS (121 ns instruction execution) with only 58 single-word instructions, packaged in a 44-pin Plastic Quad Flat Pack (MQFP/PQFP). According to the PIC17C42/42A/43/44 datasheet family, the device integrates 16 KB of OTP program memory (8K x 16 words), 454 bytes of general-purpose RAM, and 33 digital I/O pins. A microcontroller (MCU) is a single-chip computer containing a CPU core, non-volatile program memory, volatile data memory (RAM), and programmable peripheral modules. The PIC17C44 belongs to the 8-bit RISC MCU category - microcontrollers optimized for deterministic instruction execution, low power, and ease of embedded use. It sits in Microchip's hierarchy as PIC17C44 -> PIC17 family -> 8-bit PIC MCU -> microcontroller -> embedded semiconductor. It is upward-compatible with PIC16C5X, PIC12CXXX, and PIC16CXX devices, simplifying code portability. Key features include a 25 MHz maximum clock (the "-25" speed grade), industrial operating temperature range (-40C to +85C, the "I" suffix), 8.25 MIPS throughput, an 8-level deep hardware stack, and a 16-bit instruction word architecture (Harvard). The PIC17C44 is the OTP (One-Time-Programmable) EPROM variant; the "CR" siblings in the family use mask ROM. On-chip peripherals include timers, a USART, and capture/compare/PWM modules. Architecturally, the PIC17C44 uses a 16-bit-wide instruction path with separate 8-bit data path, giving C-source compatibility with PIC18 while retaining the 8-bit PIC16 toolchain feel. The 121 ns instruction cycle at 25 MHz provides ample headroom for closed-loop control loops in motor and power conversion applications. Typical applications include industrial control systems, motor drive signal conditioning, embedded instrumentation, and legacy equipment retrofits. The PIC17 family is now mature and used predominantly in long-life-cycle industrial and aerospace programs that were designed-in during the 1990s. Microchip recommends PIC18F442 as the modern pin-compatible successor for new designs. When designing with the PIC17C44-25I/PQ, note that OTP parts require a device programmer with EPROM/UV-erase support for prototyping; consider the flash-based PIC18F442 or PIC18F452 for production-ready designs. The 44-pin PQFP has gull-wing leads suitable for SMT reflow but requires careful land-pattern design. This page synthesizes distributor pricing, lifecycle risk notes, drop-in alternatives, and practical design guidance not found in the standalone manufacturer datasheet.

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PIC17C44-33/L - 8-bit 33MHz OTP MCU 16KB | Microchip 44-PLCC
PIC17C44-33/L

PIC17C44-33/L - 8-bit 33MHz OTP MCU 16KB | Microchip 44-PLCC

The Microchip Technology PIC17C44-33/L is an 8-bit CMOS EPROM/OTP-based microcontroller in the PIC17C family, delivering 8.25 MIPS performance at 33 MHz clock frequency with 121 ns instruction execution. The device integrates 16 KB of OTP program memory (8K x 16 words), 454 bytes of general-purpose RAM, and 33 digital I/O lines, all housed in a 44-pin PLCC (J-Lead) package measuring 16.59 x 16.59 mm. Background: An 8-bit microcontroller (MCU) is a single-chip computer that combines a CPU core, program memory (ROM/EPROM/Flash/OTP), data RAM, and peripheral interfaces on one die. The PIC17C family was Microchip's first architecture to use a 16-bit program word width and a 4-stage pipeline, predating the now-dominant PIC18F and dsPIC families. OTP (One-Time Programmable) memory can be written exactly once, making these parts economical for mature, high-volume production where firmware is finalized, and they remain a classic choice for legacy industrial control. Key features include the PIC RISC instruction set with 58 single-word instructions, multiple interrupt sources, a hardware multiplier, and a 16-bit wide instruction path. The 33 I/O pins each support digital I/O with programmable direction, and the device operates from a 5 V supply. External memory and peripheral expansion are accessible through the PIC17C44's external memory bus. Architecturally, the PIC17C44 uses a Harvard memory organization (separate program and data buses) and a 4-stage instruction pipeline, which is the source of its 8.25 MIPS throughput. The OTP program memory is windowless and cannot be erased, so design teams typically prototype with UV-erasable windowed variants (e.g., PIC17C44JW) before committing to OTP for production. Typical applications include industrial control systems, motor control, instrumentation, and embedded products requiring deterministic 8-bit processing. The 5 V supply and 33 MHz speed are well-matched to legacy sensor interfaces and actuator drivers. When designing with this device, verify that the 5 V supply tolerance matches your analog front-end and that pull-ups on MCLR are present. Because the part is OTP and now classified NRND/Obsolete, plan a migration path to PIC18F442 (recommended by Microchip) for new designs. This page synthesizes distributor pricing, legacy lifecycle status, drop-in alternative MPNs, and practical design notes not found in the manufacturer datasheet alone.

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