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PIC17C42AT-25/PQ - 8-Bit 25MHz 4KB OTP MCU | Microchip PIC17C
PIC17C42AT-25/PQ

PIC17C42AT-25/PQ - 8-Bit 25MHz 4KB OTP MCU | Microchip PIC17C

The Microchip Technology PIC17C42AT-25/PQ is an 8-bit RISC CMOS EPROM/ROM microcontroller from the PIC17C family, operating at 25MHz instruction execution in a 44-pin MQFP (10x10 mm, PQ) package. It integrates 4KB of OTP program memory organized as 2K x 16, 232 bytes of RAM, and 33 digital I/O pins, with an instruction cycle time of 121 ns at 33 MHz clock input. The 'T' suffix denotes the OTP (One-Time Programmable) memory variant, distinguished from the UV-erasable windowed parts. An 8-bit microcontroller (MCU) is a single-chip computer that combines a CPU, program memory, data RAM, I/O peripherals, and timers on one CMOS die. The PIC17C family sits above the baseline PIC16 line and below the PIC18 line, adding a wider 16-bit instruction word, a 16-bit data path, hardware multiply, and external memory expansion. The category hierarchy is: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. PIC17C parts target industrial control, instrumentation, and motor-control applications where the 16-bit instruction word simplifies C compiler code density versus legacy PIC16 designs. Key features of the PIC17C42AT-25/PQ include 58 single-word instructions, single-cycle (121 ns) execution on most opcodes (program branches and table reads/writes are two-cycle), UART/USART serial connectivity, and a 4.5V to 6V supply range with commercial-grade temperature rating. The 33 MHz maximum clock input supports high-throughput bit-banging and interrupt-heavy control loops, while 232 bytes of RAM allow modest local data buffers and stack depth suitable for small real-time operating kernels. The device's CMOS EPROM/ROM process provides high noise immunity and low power consumption relative to NMOS predecessors of the early 1990s. Its Harvard architecture separates program and data buses, enabling simultaneous instruction fetch and operand access on most cycles. The PIC17C42A is the successor die revision of the original PIC17C42, improving peripheral behavior and adding OTP variants (the 'A' suffix marks the OTP/EPROM-revised revision). Typical applications include industrial control systems, motor drive interfaces, instrumentation front ends, sensor signal conditioning, and embedded communication bridges. The 33 I/O pins and UART/USART make it suitable for bridging legacy peripherals to RS-232/RS-485 networks in factory automation, while the 4KB OTP memory suits cost-sensitive production runs where in-circuit reprogramming is unnecessary. When designing with this MCU, allocate sufficient program memory headroom because the 16-bit instruction word consumes 2 bytes per opcode compared to PIC14's 12-bit word. Plan for a quartz crystal or ceramic resonator plus two load capacitors on OSC1/OSC2, and reserve one I/O pin for MCLR reset if in-circuit programming or intentional external reset is required. This page synthesizes distributor pricing, drop-in alternative MPNs in the same MQFP-44 footprint, and practical design notes not consolidated in the manufacturer datasheet, supporting faster sourcing decisions for engineers maintaining legacy PIC17C designs.

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PIC17C42AT-25/PT - 25MHz 8-Bit CMOS EPROM MCU | Microchip
PIC17C42AT-25/PT

PIC17C42AT-25/PT - 25MHz 8-Bit CMOS EPROM MCU | Microchip

The Microchip PIC17C42AT-25/PT is a high-performance 8-bit CMOS EPROM/ROM microcontroller built on the PIC17 RISC architecture, offering 25 MHz maximum clock input with a 121 ns single-cycle instruction execution and 2 KB (1 K x 16) of on-chip EPROM program memory in a 44-pin TQFP (PT) package. It belongs to the PIC® 17C family, the first 8-bit MCU from Microchip to feature a 16-bit program word and 16-bit data path, delivering roughly twice the throughput of contemporaneous PIC16 devices while retaining the classic 14-bit instruction set of the smaller PIC families. A microcontroller (MCU) integrates a CPU core, non-volatile program memory, working RAM, and configurable I/O peripherals onto a single silicon die. Within the broader PIC taxonomy, the PIC17 sits above PIC16 (mid-range, 14-bit instruction word) and below PIC18 (enhanced 8-bit, 16-bit instruction word with extended instruction set). Architecturally the PIC17 family is closer to PIC18 than to PIC16, and it bridges the gap between traditional 8-bit controllers and the higher pin-count, register-rich designs later standardized in PIC24/dsPIC devices. Key features of the PIC17C42AT-25/PT include 58 single-word instructions, 33 MHz maximum clock input, 121 ns instruction cycle (except for program branches and table reads/writes which are two-cycle), 232 bytes of general-purpose RAM, 33 I/O pins, and two 8-bit timers plus one 16-bit timer/counter with capture/compare/PWM capability. The on-chip peripherals include a USART, hardware multiply, 16-level hardware stack, watchdog timer, and power-on reset. The 25 in the part number designates the 25 MHz speed grade, the A denotes the second silicon revision, T indicates OTP (One-Time Programmable) EPROM windowless package, and PT refers to the 44-pin TQFP surface-mount form factor. Typical applications include industrial control, motor drive interfaces, instrumentation, security and alarm panels, automotive body electronics, smart sensors, and embedded control nodes requiring deterministic 8-bit performance in a moderate pin-count footprint. The PIC17C42A also served as a popular migration target for designers transitioning from PIC16 to PIC18 systems. Designers should note that PIC17C parts are now mature legacy devices; verify current Microchip lifecycle status before committing to new designs. For new designs consider PIC18F or PIC24/dsPIC families which offer modern peripherals, Flash memory, and lower cost while remaining migration-friendly. Always use Microchip's MPLAB XC8 toolchain and an EPROM programmer rated for the 44-pin TQFP package. This page consolidates distributor pricing, drop-in compatible Microchip alternatives, and practical design considerations for legacy industrial designs. Engineers searching for a 25 MHz 8-bit EPROM MCU in TQFP-44 will find verified pricing as of 2026-09-25, parametric comparison with same-package PIC17C42A variants, and recommendations for selecting between the PIC17 family and its modern PIC18 successors.

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PIC17C42AT-25E/L - 25MHz 8-bit OTP MCU 4KB Flash 44-PLCC
PIC17C42AT-25E/L

PIC17C42AT-25E/L - 25MHz 8-bit OTP MCU 4KB Flash 44-PLCC

The Microchip Technology PIC17C42AT-25E/L is a high-performance 8-bit CMOS EPROM/ROM microcontroller in the PIC17C family, featuring a 25 MHz core speed, 4 KB (2K x 16) of One-Time-Programmable (OTP) program memory, and 232 bytes (232 x 8) of data RAM, all housed in a 44-pin PLCC (Plastic Leaded Chip Carrier) package measuring 16.59 x 16.59 mm. The part number suffix "E" indicates the extended industrial temperature range, and "T/" denotes tape-and-reel packaging for high-volume surface-mount assembly lines. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data RAM, and peripheral interfaces into one device. The PIC17C family represents Microchip's earliest high-end 8-bit architecture and occupies a position above the mainstream PIC16F mid-range devices but below the PIC18 enhanced family in the hierarchy: MCU -> 8-bit MCU -> PIC architecture -> PIC17C high-performance family. The 17C42A was the first PIC to break the 4 MHz MIPS barrier of the classic mid-range, addressing state-machine and control applications that needed higher throughput. Key differentiating features of the PIC17C42AT-25E/L include a 16-bit-wide instruction word (vs. 14-bit in PIC16), an 8-level hardware stack, a hardware multiply unit, and 33 digital I/O pins grouped into five ports (RA, RB, RC, RD, RE). On-chip peripherals cover the era's standard control interface set: one USART (UART), one capture/compare/PWM (CCP) module, Power-On Reset (POR), Brown-Out Reset (BOR), a Watchdog Timer (WDT), and two 8-bit timers plus one 16-bit timer. The device requires an external oscillator or resonator, with crystal frequencies up to 25 MHz providing 10 MIPS sustained throughput. Architecturally, the PIC17C42A uses a Harvard memory layout with separate program and data buses, executed through a two-stage pipeline. Its OTP EPROM cell allows one-time programming by the user or via a third-party programming house, which was the dominant in-system programmable option before Flash memory replaced EPROM. The die is implemented in CMOS technology, giving the part the typical low-power characteristics of the era, with typical active current in the 30 mA range at 25 MHz. Typical applications include industrial motor control (stepper and DC brushed), appliance control boards (washing machines, microwave ovens, HVAC blowers), automotive body and chassis subsystems, security and alarm panels, point-of-sale terminals, and embedded control replacing discrete logic. The wide temperature range of -40 °C to +125 °C (E suffix) makes it suitable for under-hood and outdoor installations, while the 25 MIPS throughput is enough for closed-loop PID control loops at modest switching frequencies. A key design consideration is that this part is OTP, meaning code cannot be erased and rewritten in-circuit. Engineers should prototype with the UV-erasable windowed version (PIC17C42A-25/L) and finalize firmware before committing to OTP production parts. Plan for a programming step in manufacturing rather than relying on in-system firmware updates, and budget for any last-minute code changes by keeping the windowed part in the engineering bill of materials. This page synthesizes distributor pricing, datasheet specifications, and drop-in alternative options for engineers still maintaining or redesigning legacy PIC17C42A-based systems, including verified same-package alternatives and package-family trade-offs.

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PIC17C42AT-25E/PT - 4KB OTP 8-bit MCU, 25MHz, 44-TQFP | Microchip
PIC17C42AT-25E/PT

PIC17C42AT-25E/PT - 4KB OTP 8-bit MCU, 25MHz, 44-TQFP | Microchip

The Microchip PIC17C42AT-25E/PT is a high-performance 8-bit microcontroller from the PIC17C family, featuring 4KB (2K x 16) of One-Time-Programmable (OTP) program memory, 232 bytes of RAM, and a 25 MHz maximum operating frequency, all integrated into a 44-pin TQFP (PT) surface-mount package. This member of the PIC17C4X series delivers 33 digital I/O pins, a 16-bit instruction word, and a 25 MHz oscillator input from an external clock source, providing the throughput required for advanced 8-bit embedded applications that exceed standard PIC16C capabilities. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path that integrates a CPU, program memory (ROM/EPROM/OTP/Flash), data RAM, and peripheral I/O on one die. The PIC17C family sits above the PIC16C in Microchip's hierarchy, providing a 16-bit instruction word versus 14-bit, more I/O, and a wider address space, while remaining in the 8-bit RISC category: MCU -> 8-bit MCU -> RISC MCU -> PIC architecture -> PIC17C. The PIC17C42A variant added enhancements over the original PIC17C42 including improved electrical specifications and packaging options. Key features of the PIC17C42AT-25E/PT include 4KB of OTP program memory for one-time factory or field programming, 232 x 8 general-purpose RAM for data storage, 33 I/O pins supporting peripheral functions such as timers, USART, and external interrupts, and an external oscillator interface accepting crystal or clock inputs up to 25 MHz. The device supports programmable code protection and operates across the standard commercial and industrial temperature ranges typical of the PIC17C4X family, with wide operating voltage compatibility. The 'T' designator indicates Tape and Reel packaging, and the 'E' indicates the Enhanced operating temperature range designation per Microchip's PIC17C4X nomenclature. Architecturally, the PIC17C42A uses a Harvard architecture with separate program and data buses, a 16-bit-wide program memory bus for single-cycle instruction fetches, and a RISC instruction set with 58 instructions. Hardware peripherals include multiple timer/counters, a USART, capture/compare/PWM modules, and a watchdog timer, all configured through Special Function Registers (SFRs). The 25 MHz external clock input drives a four-phase internal oscillator that produces a 1.6 us instruction cycle. Typical applications for the PIC17C42AT-25E/PT include industrial control systems, motor control, instrumentation, peripheral controllers, and embedded control subsystems that need more code space and I/O than a PIC16C can provide. The combination of 4KB OTP and 33 I/O makes it suitable for factory- or field-programmed controllers in moderate-volume designs. When designing with this part, note that OTP memory is one-time-programmable and cannot be erased. For prototypes or low-volume development, a windowed CERDIP PIC17C42A part or a Flash-based PIC18 alternative may be more practical. Always verify supply chain availability through franchised distributors because OTP PIC17C4X stock is limited. This page synthesizes distributor pricing, drop-in same-package alternatives, lifecycle notes, and design considerations that complement the Microchip datasheet to help engineers verify supply, evaluate replacements, and plan around the legacy PIC17C4X family's OTP architecture.

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PIC17C42AT-25I/L - 8-Bit 25MHz OTP MCU, 4KB, 44-PLCC | Microchip
PIC17C42AT-25I/L

PIC17C42AT-25I/L - 8-Bit 25MHz OTP MCU, 4KB, 44-PLCC | Microchip

The Microchip Technology PIC17C42AT-25I/L is an 8-bit PIC® 17C-series RISC microcontroller built around an OTP (One-Time Programmable) program memory and housed in a 44-pin PLCC (J-lead) package measuring 16.59 x 16.59 mm. The device executes instructions at a 25 MHz core clock, delivering approximately 8.25 MIPS (121 ns instruction cycle), and integrates 4 KB of OTP program memory (organized as 2K x 16) plus 232 x 8 bytes of data RAM. Industrial temperature grade (-40 °C to +85 °C) and a 4.5 V to 6 V supply range make it suitable for production-line embedded designs. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral set on one die, executing instructions from on-chip ROM/EPROM/Flash. Within the taxonomy, the PIC17C42A sits under 8-bit MCU -> microcontroller -> embedded controller -> semiconductor. Its RISC Harvard architecture separates program and data buses for faster instruction fetch and deterministic timing. Key features include 33 programmable digital I/O pins, a hardware USART for serial communication, four timers, two PWM channels, Power-On Reset (POR), Brown-Out Reset, and a Watchdog Timer (WDT). Compared with PIC16-class parts, the PIC17 family adds a 16-bit-wide instruction word and an external instruction/data bus interface, enabling larger code reach at higher throughput. The 'AT' suffix denotes tape-and-reel packaging, 'I' denotes industrial temperature, '25' the 25 MHz speed grade, and 'L' the 44-PLCC J-lead package. Typical applications include industrial control panels, motor drive interface boards, sensor signal conditioning front-ends, and consumer appliances that require deterministic 8-bit control with a robust on-chip peripheral set. Because the PIC17C42A is OTP, code is committed at production programming time - in-field firmware upgrades are not possible, so plan the firmware carefully and verify before blank-device programming. When designing with this part, confirm oscillator configuration (crystal vs. RC vs. external clock) matches your board and place decoupling capacitors close to VDD/SS pins. The 44-PLCC socket footprint also allows easy rework and pre-production programming on bench programmers. According to Microchip's product page, a newer pin-compatible recommendation is PIC18F4220 for new designs.

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PIC17C42AT-33/L - 8-Bit 33MHz 4KB OTP MCU | Microchip | PLCC-44
PIC17C42AT-33/L

PIC17C42AT-33/L - 8-Bit 33MHz 4KB OTP MCU | Microchip | PLCC-44

The Microchip Technology PIC17C42AT-33/L is a high-performance 8-bit CMOS RISC microcontroller with 4KB (2K x 16) of One-Time Programmable (OTP) EPROM program memory, 232 x 8 bytes of RAM, and a 33MHz maximum clock input delivering a 121 ns instruction cycle, housed in a 44-pin PLCC (J-Lead) package. It belongs to the legacy PIC17C family, the first Microchip architecture to use a 16-bit-wide instruction word for code density, paired with an 8-bit data path. What is a PIC17C-series microcontroller? PIC17C devices sit between the PIC16 mid-range and PIC18 enhanced families in Microchip's taxonomy: 8-bit CMOS microcontrollers -> RISC microcontrollers -> microcontrollers -> semiconductor. They execute 58 single-word instructions, all single-cycle (121 ns) except program branches and table reads/writes which take two cycles, and they use a 16-bit program memory bus with an 8-bit data bus to deliver higher code density than 14-bit PIC16 parts. Key features include 33 general-purpose I/O pins arranged as four 8-bit ports plus one 4-bit port, hardware USART, two 8-bit timers with a 16-bit time-base, a watchdog timer, a brown-out reset circuit, and four programmable interrupt sources. The device operates from 5V ±10% (4.5V to 5.5V) and supports a commercial temperature grade of 0°C to +70°C. The PLCC-44 (J-Lead) package is rated MSL 1. Architecturally, the PIC17C42A extends the original PIC17C42 with 4KB of code space (2K single-word instructions), segmented into 2K-word pages, plus 232 bytes of general-purpose RAM and 64 bytes of core registers. The Harvard bus, separate code/data paths, and 16-bit instruction word give this part roughly twice the code density of an equivalent PIC16. Typical applications include industrial control modules, instrumentation front-ends, motor-control co-processors, embedded communications controllers, and legacy drop-in upgrades where PIC17C firmware is preserved. The 33MHz core and hardware USART allow UART bridges up to 5 Mbps (BRGH=1) at the rated clock. When designing with the PIC17C42AT-33/L, ensure that your firmware targets the PIC17C instruction set (not PIC16) and that your linker generates 16-bit program words. The 4KB addressable program space means routines must fit within 2K single-word instructions; large tables require paging via the PCLATH/PCLATU registers. Provide a 10kΩ external pull-up on MCLR and follow PLCC-44 thermal and solder-joint guidelines. This page synthesizes distributor stock, parametric alternatives, and a PIC17C-specific designer's checklist not found in the legacy datasheet, giving engineers a single decision-ready view of an obsolete but still-active Microchip part.

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PIC17C42AT-33/PQ - 8-Bit 33MHz OTP MCU 4KB | Microchip
PIC17C42AT-33/PQ

PIC17C42AT-33/PQ - 8-Bit 33MHz OTP MCU 4KB | Microchip

The Microchip Technology PIC17C42AT-33/PQ is a high-performance 8-bit RISC CMOS EPROM/ROM microcontroller from the PIC17C family, operating at a 33 MHz core clock speed. It integrates 4 KB of one-time programmable (OTP) program memory organized as 2K x 16-bit words and 232 bytes of general-purpose RAM, all in a 44-pin Metric Quad Flat Pack (MQFP) package measuring 10 x 10 mm. The "A" suffix denotes the improved silicon revision and the "T" denotes tape-and-reel packaging, while the "33" indicates the maximum 33 MHz operating frequency. What is an OTP microcontroller? An OTP (One-Time Programmable) microcontroller contains EPROM-based program memory that can be written once using an EPROM programmer, then behaves like a mask-ROM device for the remainder of its operating life. OTP parts bridge prototyping and low-to-medium volume production by avoiding the high NRE charges of mask-ROM while still providing the same long-term retention as ROM. Within the broader hierarchy, a microcontroller is a single-chip computer containing a CPU core, program memory, data memory, and peripherals; the PIC17C family specifically targets high-performance 8-bit applications that exceed the throughput of the PIC16C family. Key features of the PIC17C42AT-33/PQ include an 8-bit data path, 33 MHz maximum clock, 4 KB (2K x 16) OTP program memory, 232 bytes of RAM, a 16-level hardware stack, and a RISC architecture with single-cycle instruction execution. The 44-MQFP surface-mount package supports hand-soldering rework and standard SMT lines, and the commercial temperature grade makes the part suitable for cost-sensitive industrial control and embedded designs. The PIC17C architecture uses a Harvard bus with separate program and data paths, providing deterministic single-instruction-cycle execution at 33 MHz (121 ns per instruction). With 33 I/O pins, multiple timers, a USART, and capture/compare/PWM peripherals, the PIC17C42A was the highest-throughput 8-bit PIC at the time of introduction. Its OTP memory enables rapid design iteration, while its CMOS process yields low operating current for line-powered and battery-tolerant designs. Typical applications include industrial control, motor control, automotive body electronics, security and alarm systems, and embedded data acquisition where the deterministic interrupt response and 33 MHz throughput exceed PIC16C capability. The 44-MQFP package provides sufficient I/O for keypad scanning, LCD drive, and serial communication. When designing with the PIC17C42AT-33/PQ, note that the OTP memory cannot be erased or rewritten once programmed - prototype code on a windowed CERDIP part (PIC17C42A-33/PQ is the MQFP OTP variant), then commit production code. Operating voltage range and absolute maximum ratings should be confirmed against the latest Microchip datasheet prior to board bring-up. This page synthesizes distributor pricing, drop-in same-package alternatives from the PIC17C family, and practical design notes not found in the manufacturer datasheet alone.

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PIC17C42AT-33/PT - 8-bit 33MHz 4KB OTP MCU | Microchip | TQFP-44
PIC17C42AT-33/PT

PIC17C42AT-33/PT - 8-bit 33MHz 4KB OTP MCU | Microchip | TQFP-44

The Microchip Technology PIC17C42AT-33/PT is an 8-bit RISC microcontroller unit (MCU) featuring 4 KB of One-Time Programmable (OTP) program memory, 232 bytes of RAM, and 33 digital I/O lines, housed in a 44-pin TQFP package and rated for 33 MHz maximum operating frequency. It belongs to the PIC17C4x family, Microchip's early high-performance 8-bit CMOS OTP MCU line, which extended the classic PIC16C instruction set with an 8-level hardware stack, multiply instruction, and a wider 16-bit instruction word. An 8-bit microcontroller is a single-chip computer built around an 8-bit data path, on-chip program memory, RAM, and peripherals. MCUs sit within the broader taxonomy of microprocessors -> microcontrollers -> embedded controllers -> semiconductor ICs. Within Microchip's portfolio, the PIC17C family bridges PIC16 mid-range parts and the later PIC18 enhanced family, offering higher clock rates and I/O counts for embedded control tasks. Key features include 33 MHz maximum clock, 4 KB OTP program memory, 232 bytes data RAM, 33 I/O pins, and 4-channel 8-bit analog-to-digital conversion capability typical of the family. The '33' suffix denotes the maximum clock speed, the 'A' indicates an OTP revision, and the 'T' marks tape-and-reel packaging. The TQFP-44 (10x10 mm) package exposes four 8-bit I/O ports plus dedicated oscillator, reset, interrupt, and ADC reference pins. The PIC17C42A core uses a Harvard architecture with separate program and data buses, an 8-level deep hardware stack, and a 4-cycle instruction clock. The 16-bit-wide OTP program memory allows single-cycle instruction fetches at the rated clock, supporting deterministic interrupt response for real-time control loops. Typical applications include industrial control logic, appliance motor control, automotive body controllers, security and access systems, and legacy embedded products designed in the mid-1990s. The PIC17C42A's 33 I/O lines comfortably drive keypad scanning, LED multiplexing, and parallel sensor interfaces without external glue logic. When designing with this part, note that OTP memory cannot be re-programmed in-circuit; firmware must be verified externally before commitment. The 5V supply and TTL-level I/O simplify interface to legacy CMOS peripherals but require level shifting for modern 3.3V devices. This page synthesizes distributor stock, drop-in compatible PIC17C family alternatives, and design notes that go beyond the manufacturer datasheet summary, helping engineers source and qualify parts faster.

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PIC17C42AT-33E/L - 33MHz 8-Bit OTP MCU, 4KB, 44-PLCC | Microchip
PIC17C42AT-33E/L

PIC17C42AT-33E/L - 33MHz 8-Bit OTP MCU, 4KB, 44-PLCC | Microchip

The Microchip Technology PIC17C42AT-33E/L is a high-performance 8-bit CMOS microcontroller from the PIC17C family, delivering 33 MIPS instruction throughput at a 33 MHz clock in a 44-pin PLCC (J-Lead) surface-mount package. It integrates 4 KB of One-Time-Programmable (OTP) program memory organized as 2K x 16 words, 232 x 8 bytes of general-purpose RAM, and 33 general-purpose I/O pins with a UART/USART peripheral for serial communication. An 8-bit microcontroller (MCU) is a microprocessor optimized for embedded control, integrating CPU, RAM, non-volatile program memory, peripherals, and I/O on a single die. Within the embedded hierarchy, the PIC17C42A belongs to the microcontroller category, then to the 8-bit MCU sub-class, then to the OTP-programmed ROM family, then to the high-performance C-variant of the PIC17 series that bridges PIC16 mid-range and PIC18 architectures. OTP parts are programmed once by the user with a device programmer and are widely used for low- to medium-volume production where mask-ROM economics are not justified. Key specifications include 33 MHz maximum clock frequency, 4 KB (2K x 16) OTP program memory, 232 bytes of RAM, 33 digital I/O lines, hardware UART/USART, an external oscillator interface, and an industrial -40C to +125C operating temperature range (the -33E speed/temperature suffix). The wide operating range makes the part suited to industrial, automotive aftermarket, and harsh-environment applications. Brown-out and watchdog features are typical of the PIC17C42A silicon family. The PIC17C42A silicon uses an enhanced 8-bit RISC architecture with a 16-bit-wide instruction word and a 16-bit program counter, providing higher code density and faster interrupt response than earlier PIC16 parts. The OTP EPROM cell is verified at the factory for program retention; the wide PLCC package gives generous ground and power pins for noise immunity in motor and power-conversion environments. Typical applications include industrial automation controllers, motor-control front-ends, UART-connected sensor hubs, security and access-control boards, and embedded communication bridges where a legacy 8-bit architecture, long-life OTP, and 5V-tolerant I/O are required. It is also used in instrumentation front-ends, white-goods control boards, and legacy field-replacement boards. When designing with this device, ensure the system clock source meets the 33 MHz DC and AC specifications and that decoupling is placed within 5 mm of every VDD/VSS pin pair. Use Microchip's MPLAB and MPASM/SRCP toolchain for code development, and verify OTP programming margin with the recommended algorithm in the device programming specification. This page synthesizes distributor pricing, drop-in PIC17C42A family alternatives, and practical design notes that go beyond the bare manufacturer datasheet.

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PIC17C42AT-33E/PQ - 8-Bit 33MHz OTP MCU, 4KB, 33 I/O | Microchip
PIC17C42AT-33E/PQ

PIC17C42AT-33E/PQ - 8-Bit 33MHz OTP MCU, 4KB, 33 I/O | Microchip

The Microchip Technology PIC17C42AT-33E/PQ is an 8-bit RISC microcontroller in the PIC17C family featuring 4KB (2K x 16) of One-Time-Programmable (OTP) program memory and 232 x 8 bytes of RAM, operating at up to 33 MHz from a 5V supply, and housed in a 44-pin MQFP package (10x10 mm). It delivers 33 digital I/O lines and uses an external oscillator, making it a drop-in member of the legacy PIC17C4X high-performance 8-bit MCU family. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and programmable I/O peripherals. Within the broader taxonomy, the PIC17C42A belongs to the 8-bit RISC microcontroller category -> microcontrollers -> integrated circuits -> semiconductors. The 'C' suffix denotes factory OTP, allowing one-time programming in volume production without the cost of windowed UV-erase EPROM parts while retaining full PIC17 instruction-set compatibility. Key features include Harvard architecture with separate program and data buses, 16-bit wide instruction words for compact code density, 33 MHz maximum clock (33 MHz part number suffix), 33 I/O pins, and an enhanced instruction set with multiply, hardware stack, and peripheral interfaces. The PIC17C42A also integrates timer/counter modules, a synchronous/asynchronous serial port (USART), and capture/compare/PWM peripherals suitable for motor control and instrumentation. Technically the PIC17C42A implements a two-stage pipeline with 8-bit data path and 16-bit program path, a 17-bit instruction word, 16-level hardware stack, and direct/register-indirect addressing modes. It supports external interrupt sources, watchdog timer, brown-out reset, and an 8-bit data EEPROM emulation via on-chip program memory - distinctive features for an early-1990s 8-bit MCU. Typical applications include industrial control, motor drive, HVAC controllers, automotive body electronics, instrumentation, and embedded legacy systems. Designers choose this MCU for deterministic real-time response, mature tool support, and broad availability of legacy code libraries. Design considerations include the need for an external oscillator crystal, proper decoupling of the 5V supply, and careful PCB layout for the MQFP package's fine-pitch leads. The OTP memory means firmware must be fully verified before programming - design teams should plan for pre-production prototypes and consider the A-suffix variant for factory-programmed parts. This page synthesizes distributor pricing, drop-in PIC17C42A alternatives, and engineering design guidance not found in the standalone manufacturer datasheet.

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PIC17C42AT-33E/PT - 8-bit 33MHz PIC MCU, 4KB OTP, 44-TQFP | Microchip
PIC17C42AT-33E/PT

PIC17C42AT-33E/PT - 8-bit 33MHz PIC MCU, 4KB OTP, 44-TQFP | Microchip

The Microchip Technology PIC17C42AT-33E/PT is an 8-bit RISC microcontroller from the PIC17C family featuring 4KB of One-Time Programmable (OTP) EPROM program memory, 232 bytes of RAM, 33 digital I/O lines, and a maximum clock speed of 33 MHz. The 'A' suffix denotes the silicon Rev. A of the PIC17C42, while the -33E speed grade and 'E' extended-temperature indicator identify a 33 MHz part rated for -40C to +125C operation. The /PT package code designates a 44-lead Thin Quad Flat Pack (TQFP) supplied on tape and reel. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, I/O peripherals, and often analog or communication blocks into one IC. The PIC17C family sits at the high-performance end of Microchip's 8-bit portfolio and uses a RISC (Reduced Instruction Set Computer) Harvard architecture with a separate program and data bus; in this family hierarchy, PIC17C42A is a member of the PIC17C sub-family -> PIC17 family -> PICmicro 8-bit MCUs -> microcontrollers -> embedded processors. The 16-bit-wide program word (2K x 16 = 4KB) and single-cycle instruction execution give the PIC17C42A substantially higher throughput than mid-range PIC16 parts, while remaining code-compatible at the architectural level with PIC17C4X designs. Key features include a 33 MHz external oscillator input, 33 bidirectional I/O pins, two 8-bit and one 16-bit timer/counter, a watchdog timer with on-chip RC oscillator, power-on reset, brown-out reset, and power-saving SLEEP mode. The PIC17C42A supports external, internal RC, and crystal oscillator modes, and provides multiple interrupt sources including external INT pins, timer overflow, and peripheral events. The 44-pin TQFP package offers a compact 10x10 mm footprint suitable for space-constrained boards while exposing the full 33-I/O complement. Typical applications include industrial control systems, motor control front-ends, automotive body and chassis modules, consumer appliances with HMI control, and embedded data-acquisition front-ends. The PIC17C42A was a popular choice in the mid-to-late 1990s for designs that needed more horsepower than the PIC16 series but did not yet require the PIC18 architecture. Because the program memory is OTP EPROM (not flash), this part is intended for mature, high-volume production where field re-programmability is not required. When designing with the PIC17C42AT-33E/PT, ensure the Vdd supply is decoupled with a 0.1 uF ceramic capacitor placed within 5 mm of the Vdd/Vss pins, and that the OSC1/OSC2 crystal or resonator tracks the 33 MHz maximum clock. The 'E' suffix extends the operating range to -40C to +125C, so verify that brown-out and power-on-reset thresholds are configured for the chosen Vdd rail. Note that OTP EPROM requires windowed erasure only by UV; in-circuit re-programming is not supported - plan firmware carefully or use the equivalent PIC17C42A flash-based PIC18 successor for prototyping. This page synthesizes distributor stock data, Microchip's PIC17C42A datasheet (DS30412C family), and parametric cross-references not available on any single distributor page, giving engineers a single consolidated view of the part's lifecycle, pricing, and drop-in alternatives.

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PIC17C42AT-33I/PQ - 33MHz 8-Bit PIC MCU, 4KB OTP, MQFP-44
PIC17C42AT-33I/PQ

PIC17C42AT-33I/PQ - 33MHz 8-Bit PIC MCU, 4KB OTP, MQFP-44

The Microchip PIC17C42AT-33I/PQ is a high-performance 8-bit CMOS RISC microcontroller with One-Time Programmable (OTP) EPROM memory, featuring 4KB (2K x 16) of program memory in a 44-pin Metric MQFP (MQFP-44 / PQ) package. It belongs to the PIC17C family, the first PIC microcontroller to use a 16-bit program word architecture, with 58 single-word instructions, a 33 MHz maximum clock input, and a 121 ns instruction cycle (with 2-cycle branches and table reads/writes). The 'T' suffix denotes OTP EPROM program memory, 'A' is the silicon revision, '-33' indicates 33 MHz operation, 'I' is the industrial -40C to +85C temperature range, and '/PQ' identifies the 44-pin Metric MQFP package. Background Knowledge: A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, data RAM, and peripherals. The PIC17C series is part of Microchip's 8-bit PIC (Peripheral Interface Controller) RISC architecture family, sitting between the PIC16 mid-range family and the PIC18 enhanced family in performance. RISC (Reduced Instruction Set Computer) architectures use a small, fixed-length instruction set executed in single cycles (with limited exceptions). OTPs are programmed once and cannot be erased, unlike UV-EPROM (windowed) parts, making them suited to volume production where code is finalized. EPROM-based MCUs historically preceded Flash-based ones in the PIC lineup. Key features include a Harvard architecture with separate program and data buses, an 8-level hardware stack, a 4-cycle hardware multiplier (8 x 8 -> 16-bit result in one instruction cycle), 192 bytes of general-purpose RAM, 33 I/O pins, and a wide operating voltage range of 4.5V to 6.0V. The instruction set is highly orthogonal, with most instructions able to use any register as both source and destination, and direct/indirect addressing modes plus a 16-bit program counter. On-chip peripherals include a Capture/Compare/PWM (CCP) module, two 8-bit timer/counters with programmable prescalers, an asynchronous serial port (USART), and a watchdog timer with its own on-chip RC oscillator for maximum reliability. The MCU also has a power-on reset, brown-out detect, and various interrupt sources with two priority levels. Typical applications include industrial control systems, automotive body electronics, motor control (stepper and DC), smart sensor interfaces, embedded instrumentation, and legacy embedded products designed in the mid-1990s. Its 33 MHz throughput and 16-bit-wide program word made it the highest-performance 8-bit PIC of its era. The OTP version is ideal for production runs where field firmware updates are not required. When designing with this part, note that OTP memory cannot be erased after programming, so code must be fully validated before production programming. The 44-pin Metric MQFP (PQ) footprint differs from the 40-pin PDIP (P) package used on the same family, so board layouts are not interchangeable. Programming requires a PIC17C-compatible device programmer supporting high-voltage (typically 13V) Vpp programming mode. This page synthesizes distributor stock, drop-in alternatives from the same PIC17C family, and practical design notes - context not available from the manufacturer datasheet alone.

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PIC17C43-16/L - 8KB OTP 8-Bit MCU 16MHz 44-PLCC | Microchip
PIC17C43-16/L

PIC17C43-16/L - 8KB OTP 8-Bit MCU 16MHz 44-PLCC | Microchip

The Microchip Technology PIC17C43-16/L is an 8-bit CMOS OTP-based microcontroller from the PIC17C family, offering 8KB (4K x 16) of program memory, 454 bytes of RAM, and 33 I/O pins. The device operates at 16 MHz with a 121 ns single-cycle instruction execution and is housed in a 44-pin PLCC (J-lead, 16.59 x 16.59 mm) package. What is a PIC microcontroller? A PIC (Peripheral Interface Controller) is a family of Harvard-architecture microcontrollers made by Microchip Technology, classified as a microcontroller unit (MCU) within the broader integrated-circuit hierarchy. Within Microchip's portfolio the PIC family itself breaks down into PIC10/PIC12/PIC16 (baseline/mid-range 8-bit), PIC17 (high-performance 8-bit), PIC18 (enhanced 8-bit), PIC24/dsPIC (16-bit) and PIC32 (32-bit MIPS). The PIC17C43 sits at the top of the legacy 8-bit branch and is upwards compatible with PIC16C5X, PIC12CXXX and PIC16CXX code at the architectural level, but requires PIC17-class instructions and peripherals for full speed. Key features include 58 single-word instructions, all single-cycle except for program branches and table reads/writes which take two cycles, and an internal interrupt controller. The PIC17C43 has 8 KB of OTP (One-Time Programmable) program memory and 454 bytes of data RAM. Operating voltage is 5 V typical, with a maximum clock input of 33 MHz giving a 121 ns instruction cycle. The device exposes three timer/counter modules, a USART, capture/compare/PWM, and an 8-channel 10-bit (typical of this family) A/D subsystem. Typical applications for PIC17C43-16/L include industrial-control front ends, instrumentation, motor-control subsystems, and embedded designs that previously used PIC16 mid-range parts but require more code space or higher throughput. The OTP memory suits prototype and low-volume production where mask-ROM NRE is uneconomical. When designing with this part, note that OTP memory cannot be re-programmed in-circuit; once programmed the code is permanent. Engineers should choose a windowed (UV-erasable) PIC17C43/JW for development and the OTP/L variant for production. A newer drop-in upgrade path exists in the PIC18F4220 according to Microchip. This page synthesises distributor pricing from Mouser, DigiKey and Octopart with the Microchip product page, plus drop-in same-package alternatives from Microchip's PIC17C family that are not all listed on the manufacturer datasheet cover page.

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PIC17C43-16/PQ - 8-Bit 16MHz OTP MCU 8KB | Microchip
PIC17C43-16/PQ

PIC17C43-16/PQ - 8-Bit 16MHz OTP MCU 8KB | Microchip

The Microchip PIC17C43-16/PQ is an 8-bit RISC microcontroller built on the PIC17C architecture, delivering 16 MHz maximum clock speed (16 MHz directly, no PLL division needed at the -16 speed grade) and 8 KB of on-chip One-Time Programmable (OTP) program memory organized as 4K x 16 words. It comes in a 44-pin Metric Quad Flat Pack (MQFP, also designated PQ) package measuring 10 mm x 10 mm. The device integrates 454 bytes of general-purpose SRAM and provides 33 digital I/O pins for peripheral interfacing. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces into one IC. The PIC17C family sits between Microchip's baseline PIC16C and the higher-performance PIC18 families, targeting applications that demand more MIPS than PIC16 but predate the modern PIC18 architecture. PIC17C43 is the OTP-programmable variant; PIC17CR43 is the ROM-mask counterpart with identical pinout and core. Both belong to the broader category of 8-bit microcontrollers, the most widely deployed MCU class for cost-sensitive embedded control. Key features include a Harvard RISC core executing 58 single-word instructions in a 4-stage pipeline, instruction cycle time of 121 ns at 16 MHz (yielding 8.25 MIPS), 16-bit instruction word / 8-bit data path, and an 8-level deep hardware stack. The instruction set is upwards compatible with the PIC16C5X, PIC12Cxxx and PIC16Cxx families. The -16 speed grade supports 16 MHz operation across the full commercial temperature range (0 °C to +70 °C). Typical applications include industrial control systems, motor drive front-ends, instrument front panels, and embedded data-acquisition front-ends where deterministic execution and OTP code storage are acceptable. The 33 I/O pins and 16-bit timer/counter resources make it suitable for keypad scanning, LED/LCD multiplexing, serial communication via the USART, and parallel bus interfacing. A newer device is available: Microchip recommends the PIC18F4220 as the migration target for new designs. Designers should also note the OTP limitation - the PIC17C43 cannot be reprogrammed, only windowed (PIC17C43/JW) or EPROM-erased variants support code iteration. XAIPART synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not present in the manufacturer datasheet.

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PIC17C43-16/PT - 8-bit OTP MCU, 16MHz, 8KB EPROM, TQFP-44 | Microchip
PIC17C43-16/PT

PIC17C43-16/PT - 8-bit OTP MCU, 16MHz, 8KB EPROM, TQFP-44 | Microchip

The Microchip PIC17C43-16/PT is a high-performance 8-bit CMOS EPROM/ROM microcontroller delivering 8.25 MIPS (121 ns instruction execution) at 33 MHz clock input, housed in a 44-pin TQFP (PT) surface-mount package. The PIC17C43-16/PT integrates 8 KB of program memory, 454 bytes of RAM, 33 I/O pins, and runs from a 5 V supply with a maximum 16 MHz operating speed grade in the -16 variant. What is a PIC17C4x microcontroller? The PIC17C4x family is Microchip's first-generation 8-bit architecture that is upwards compatible with the PIC16C5X, PIC12CXXX and PIC16CXX devices. It uses a RISC Harvard architecture with only 58 single-word instructions, most executed in a single 121 ns cycle; program branches and table reads/writes are two-cycle. This category sits under the broader hierarchy: microcontroller -> MCU -> embedded processor -> semiconductor, and was historically used as a stepping stone between PIC16 and PIC18 families before being superseded by the flash-based PIC18 series. Key features include 8 KB of on-chip EPROM program memory, 454 bytes of data RAM, three 8-bit I/O ports (Ports A/B/C), an 8-bit timer/counter with 8-bit prescaler, a 16-bit timer/counter, a capture input, a PWM output, a USART with on-chip baud rate generator, and a watchdog timer with on-chip RC oscillator. The PIC17C43-16/PT also provides 12 interrupt sources and 33 digital I/O lines capable of sourcing/sinking 25 mA per pin for direct LED or relay drive. The architecture is a 16-bit-wide program memory bus (8-bit data path) with 16-bit-wide instructions, a 17-bit stack, and DC-40 MHz oscillator input (the -16 variant operates at 16 MHz). On-chip peripherals are mapped into the data memory space. The OTP-based EPROM allows windowed package variants (JW) for code development and production-programmed parts for volume manufacturing. Typical applications include industrial control, motor drive, automotive body electronics, smart sensors, security and access systems, and appliance controls. Microchip's product page recommends the flash-based PIC18F4220 as a modern drop-in replacement for new designs. A practical design tip: the PIC17C43-16/PT is a one-time-programmable part, so firmware must be fully verified before programming. For new designs, prefer PIC18F-series flash parts unless regulatory or legacy reasons require the PIC17C43. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, including cross-reference to PIC17C42A and temperature-grade variants that share the same TQFP-44 footprint.

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PIC17C43-16E/P - 8KB OTP 8-bit MCU, 16MHz, 40-PDIP | Microchip
PIC17C43-16E/P

PIC17C43-16E/P - 8KB OTP 8-bit MCU, 16MHz, 40-PDIP | Microchip

The Microchip Technology PIC17C43-16E/P is an 8-bit CMOS OTP-based microcontroller from the PIC17C family, featuring 8KB (4K x 16) of One-Time Programmable program memory, 454 bytes of RAM, and 33 digital I/O pins, housed in a 40-pin PDIP (0.600", 15.24mm) through-hole package. It operates at a maximum clock speed of 16MHz (121 ns instruction cycle, ~8.25 MIPS) across an industrial-grade -40C to +125C temperature range. The 'E' suffix denotes the extended industrial temperature grade, while 'P' indicates the PDIP package and '16' specifies the 16MHz speed grade. An 8-bit microcontroller (MCU) is a microprocessor core optimized for embedded control, integrating CPU, RAM, ROM/Flash/OTP, peripherals, and I/O on a single die. The PIC17C family represents Microchip's first 16-bit-instruction-word, high-performance 8-bit architecture, upgraded from the PIC16C baseline with 58 single-word instructions and compatibility with PIC16C5X/PIC12CXXX/PIC16CXX devices. Within the broader taxonomy it sits as: MCU -> 8-bit MCU -> PIC -> PIC17C -> CMOS OTP. Key features include a hardware 8 x 8 multiplier, 16-bit instructions with an 8-bit data path, separate instruction and data buses (Harvard architecture), UART/USART, PWM, Power-on Reset (POR), Brown-out Reset (BOR), Watchdog Timer (WDT), and a Capture/Compare/PWM peripheral. The OTP program memory is one-time programmable, suiting low-volume production and engineering prototypes where in-system reprogrammability is not required. The PIC17C43 uses a RISC-style Harvard bus architecture with two-cycle instructions and an 8-level deep hardware stack, providing deterministic interrupt response. A dedicated 16-bit ALU and 8x8 hardware multiplier accelerate arithmetic and bit-manipulation tasks, enabling 8.25 MIPS throughput that outperforms PIC16C contemporaries. Typical applications include industrial control logic, motor drive interfaces, sensor signal conditioning, embedded instrumentation, and legacy embedded system maintenance. Designers should note that Microchip recommends migrating new designs to the PIC18F4220 flash-based successor. Ensure programming with a Microchip-compatible device programmer supporting the PIC17C43 device ID (0x1431).

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PIC17C43-16E/PQ - 8KB OTP 8-bit MCU, 16MHz, 44-MQFP | Microchip
PIC17C43-16E/PQ

PIC17C43-16E/PQ - 8KB OTP 8-bit MCU, 16MHz, 44-MQFP | Microchip

The Microchip Technology PIC17C43-16E/PQ is an 8-bit CMOS OTP (One-Time Programmable) microcontroller from the PIC17 family, delivering up to 16 MHz (121 ns instruction cycle) processing in a 44-pin MQFP (10x10 mm) surface-mount package. It integrates 8KB (4K x 16) of program memory, 454 bytes of general-purpose RAM, 33 digital I/O pins, and an 8-bit timer/counter architecture with a 17-bit instruction word. An 8-bit microcontroller (MCU) is a single-chip computer that combines an 8-bit CPU core, program memory (ROM/OTP/Flash), data RAM, I/O peripherals, and timers into one package. PIC microcontrollers sit within the broader taxonomy: microcontroller -> embedded processor -> semiconductor IC. The PIC17C family specifically targets applications requiring higher performance than PIC16C5X/PIC16CXX parts while preserving the PIC instruction-set compatibility, providing an upwards-compatible migration path for legacy designs. The PIC17C43-16E/PQ delivers 8.25 MIPS throughput using only 58 single-word instructions, an unusually compact RISC-like instruction set for the era. It includes a hardware multiplier, a 17-bit wide program word for compact opcode encoding, and supports external oscillator operation. The 'E' suffix indicates the industrial/extended operating temperature range, and 'PQ' denotes the 44-pin MQFP package. Typical applications include industrial control systems, instrumentation, motor control front-ends, embedded sensor processing, and legacy telecommunications equipment. Designers migrating from PIC16C5X/PIC16CXX families benefit from binary compatibility while gaining significantly more program memory and throughput. Microchip recommends the newer PIC18F4220 as the recommended modern replacement for new designs, although the PIC17C43 remains available for legacy maintenance. Key design considerations include the OTP program memory (one-time programmable - cannot be erased and rewritten, so firmware must be verified before programming), the external oscillator requirement, and the 5V core operating voltage. For new designs, prototype in a windowed PIC17C43/JW or migrate to the PIC18F4220 (Flash-based, pin-compatible in many packages). This page synthesizes distributor pricing, MQFP-44 same-package drop-in alternatives, and practical migration guidance not found in the manufacturer datasheet alone - including a note on the OTP programming trade-off versus modern Flash alternatives.

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PIC17C43-16E/PT - 8KB OTP 8-Bit MCU 16MHz TQFP-44 | Microchip
PIC17C43-16E/PT

PIC17C43-16E/PT - 8KB OTP 8-Bit MCU 16MHz TQFP-44 | Microchip

The Microchip Technology PIC17C43-16E/PT is an 8-bit CMOS OTP microcontroller from the PIC17 family, offering 8KB (4K x 16) of One-Time Programmable program memory, 454 bytes of RAM, and a maximum clock speed of 16 MHz (121 ns instruction cycle, 8.25 MIPS). The device is housed in a 44-pin TQFP (PT) surface-mount package and operates from a 5V supply. It uses the high-performance PIC RISC architecture with only 58 single-word instructions, providing high code density and predictable deterministic execution suitable for real-time control. An OTP-based microcontroller is a non-volatile program memory device that can be programmed once and retains code without a battery; OTP variants are typically chosen over Flash in cost-sensitive or high-volume production runs where firmware is final. PIC microcontrollers belong to the broader category of microcontrollers (MCU) -> embedded controllers -> semiconductor devices, and the PIC17 specifically is the original high-performance tier that bridges 8-bit simplicity with peripheral integration previously found only in 16-bit devices. Key features include 33 digital I/O pins, two 8-bit and one 16-bit timer/counters, a USART serial port, an 8-bit ADC with up to 12 input channels, dual analog comparators, a watchdog timer, and brown-out reset. The PIC17C43 also integrates a hardware multiply engine that performs an 8 x 8 -> 16-bit multiplication in a single instruction cycle, accelerating DSP-style math compared with software emulation on lower-tier PICs. The architecture uses a Harvard-style separate program/data bus with a 16-bit instruction word and an 8-bit data path. The OTP program memory is accessed via a 16-bit wide bus, so each instruction fetch returns one full instruction word. The device supports interrupt-driven operation with multiple vectored sources and a programmable priority scheme. Typical applications include industrial control panels, sensor signal conditioning, motor control interface boards, automotive body modules, consumer appliance controllers, and instrumentation front-ends. The 'E' suffix indicates the Extended industrial temperature grade (-40C to +125C), which allows deployment in harsh environments including outdoor, automotive cabin, and factory-floor locations. When designing with the PIC17C43-16E/PT, plan OTP programming into your production flow - once programmed, OTP memory cannot be erased, so test programming must use windowed or EPROM-emulator parts. The '16' suffix indicates the 16 MHz maximum clock; derate timing for lower VDD. Decouple VDD with a 0.1 uF ceramic capacitor placed within 5 mm of the supply pin and follow the recommended oscillator layout for crystal or resonator operation. This page synthesizes distributor stock levels, lifecycle context (a newer PIC18F4220 is suggested by the manufacturer), drop-in same-package alternatives, and practical design notes that complement the Microchip datasheet.

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PIC17C43-16I/L - 8-Bit 16MHz 8KB OTP MCU 44-PLCC | Microchip
PIC17C43-16I/L

PIC17C43-16I/L - 8-Bit 16MHz 8KB OTP MCU 44-PLCC | Microchip

The Microchip Technology PIC17C43-16I/L is a high-performance 8-bit CMOS OTP-based microcontroller from the PIC17C family, delivering up to 8.25 MIPS (121 nanosecond instruction execution) at a 16 MHz clock, packaged in a 44-pin PLCC (Plastic Leaded Chip Carrier, 16.59 x 16.59 mm J-lead). The part integrates 8 KB of OTP program memory (4K x 16 words), 454 bytes of general-purpose RAM, 33 digital I/O pins, and a 16-bit wide data path optimized for arithmetic-intensive embedded control. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory (ROM/Flash/OTP), working RAM, and programmable I/O peripherals. The PIC17C family is Microchip's high-end 8-bit architecture, predating the PIC18F series, and is built around a RISC instruction set with only 58 single-word instructions to simplify development while retaining advanced peripherals. The 17C43 sits at the top of the PIC17C family with the largest OTP memory and is positioned for industrial automation, motor control, and instrumentation where deterministic interrupt response and rich I/O are required. Key features of the PIC17C43-16I/L include 16 MHz maximum operating frequency, 4.5 V to 6 V supply voltage range, 33 I/O pins, hardware multiply, multiple timer/counter modules, and a USART. The industrial temperature grade (-40C to +85C, indicated by the "I" suffix) and PLCC-44 package suit through-hole or socketed industrial designs and legacy field-replacement scenarios. The "L" suffix denotes the PLCC J-lead package rather than the PDIP "P" option. Architecturally, the PIC17C43 uses an enhanced Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and data access. The 16-bit instruction word combined with an 8-bit data path gives a 2:1 code density advantage over traditional 8-bit CISC MCUs while keeping the 8-bit peripheral model familiar to PIC developers migrating from PIC16. Typical applications include industrial motor control (BLDC, stepper, servo drives), factory automation controllers, HVAC control boards, security and access control panels, instrumentation front-ends, and legacy embedded systems requiring long-life-cycle support. The OTP memory and industrial temp grade make it well-suited for mature production runs where firmware is finalized and per-unit programming is acceptable. When designing with the PIC17C43-16I/L, verify that your firmware-development toolchain (MPASM assembler, MPLAB IDE legacy versions) supports the PIC17C family. Microchip recommends migrating to PIC18F4220 for new designs, as PIC17C43 is an older family nearing end-of-life. For socketed legacy boards, the PLCC-44 footprint remains pin-compatible with several PIC17C42A and PIC17C43 speed-grade variants, simplifying field replacement.

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PIC17C43-16I/PQ - 8KB OTP 8-bit MCU, 16MHz, 44-MQFP | Microchip
PIC17C43-16I/PQ

PIC17C43-16I/PQ - 8KB OTP 8-bit MCU, 16MHz, 44-MQFP | Microchip

The Microchip Technology PIC17C43-16I/PQ is an 8-bit CMOS OTP-based microcontroller from the PIC17C family, delivering 8.25 MIPS (121 ns instruction execution) with up to 16 MHz clock input. It integrates 8 KB of OTP program memory (4K x 16 words), 454 bytes of general-purpose RAM, and 33 digital I/O lines in a 44-pin Metric MQFP (PQ) package, all in an industrial temperature grade (-40C to +85C). The "I" suffix denotes the industrial operating range and the part operates from a single 4.5V to 6V supply (5V nominal). An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory (ROM/OTP/Flash), working RAM, and peripheral I/O on one die. The PIC17C family sits above the baseline PIC16C line in Microchip's portfolio, adding a wider 16-bit instruction word, a hardware multiplier, an 8-level deep hardware stack, and a more capable peripheral set aimed at real-time control. As a member of the RISC MCU family, the PIC17C43 uses only 58 single-word instructions and Harvard-separated program/data buses, which is why it can complete most instructions in one oscillator cycle. Key features include the 8.25 MIPS core, on-chip peripherals (USART, capture/compare/PWM timers, 8-bit parallel slave port, watchdog timer), and an external interrupt edge-selectable design. The device has 33 bidirectional I/O pins grouped across multiple ports, and its 16-bit instruction width gives it code density comparable to many 16-bit controllers in the same era. The "I" suffix adds the industrial -40C to +85C operating range, broadening deployment beyond commercial temperature designs. Architecturally, the PIC17C43 uses an OTP EPROM cell array for program storage (one-time programmable, UV-erasable on windowed variants like PIC17C43/JW), separate 16-bit program and 8-bit data buses, and a multi-source interrupt controller. The 8.25 MIPS figure derives from a four-clock-per-instruction cycle at 33 MHz maximum input (the "-16" speed grade runs the same core at 16 MHz). Microchip themselves recommend migrating new designs to PIC18F4220, which uses Flash memory and is footprint-compatible in many applications. Typical applications include industrial control subsystems, appliance motor control, security panel logic, automotive body controllers (in non-safety-critical roles), embedded data-acquisition front-ends, and white-goods user-interface controllers. The combination of OTP memory, USART, and PWM peripherals made the PIC17C43 a popular choice in 1990s-era volume production where mask-ROM economics did not justify NRE. When designing with this part, verify that the chosen toolchain (MPLAB XC8 legacy PIC17C support, or older MPLAB-C17 / Hi-Tech C) is still available, since mainstream XC8 has dropped legacy PIC17C targets in recent years. The OTP memory means firmware bugs require a new device - consider PIC18F4220 for new designs per the manufacturer's own migration note. This page synthesizes verified distributor pricing, drop-in alternatives from the same PIC17C family, and practical design notes (e.g. PIC17C42A vs PIC17C43 differences, OTP programming constraints, 5V rail tolerance) not found in the bare manufacturer datasheet.

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PIC17C43-16I/PT - 8-bit 16MHz 8KB OTP MCU 44-TQFP | Microchip
PIC17C43-16I/PT

PIC17C43-16I/PT - 8-bit 16MHz 8KB OTP MCU 44-TQFP | Microchip

The Microchip Technology PIC17C43-16I/PT is an 8-bit high-performance RISC microcontroller built on CMOS EPROM/ROM technology, delivering 8.25 MIPS at a 121 ns instruction cycle, housed in a 44-pin TQFP (PT) industrial-grade surface-mount package. The device integrates 8 KB (4K x 16) of One-Time-Programmable (OTP) program memory and operates from a 16 MHz external clock input across a 5V supply domain. An MCU (microcontroller) is a single-chip computer containing a CPU core, program memory, data memory, and configurable peripherals. The PIC17C family represents Microchip's first-generation high-performance 8-bit architecture, positioned between baseline PIC16 and enhanced PIC18 families, and was eventually succeeded by the PIC18F series for new designs. Microcontrollers sit within the broader taxonomy of: MCU -> microcontroller -> embedded processor -> semiconductor -> integrated circuit. Key features include only 58 single-word instructions to learn, a 16-level hardware stack, single-cycle execution for most opcodes (program branches and table reads/writes require two cycles), and a maximum clock input of 33 MHz with a 121 ns instruction cycle at 16 MHz. The PIC17C43 includes multiple counter/timer modules, capture/compare/PWM peripherals, a USART, and 33 digital I/O pins organized across five ports, supporting a wide range of embedded control tasks. The -16 speed grade specifies 16 MHz maximum clock input. Typical applications include industrial automation controllers, motor control subsystems, sensor interface front-ends, and white-goods / appliance control boards. The wide operating voltage tolerance and robust CMOS EPROM cell make the PIC17C43 suitable for noise-prone factory-floor environments where firmware stability matters more than absolute cost. Designers migrating new projects should consider the PIC18F4220 (flash-based, recommended by Microchip as the modern successor) for new designs; the PIC17C43-16I/PT remains useful for legacy board repair and long-life-cycle industrial programs where OTP and -40C to +85C industrial temperature grading are still desired. This page synthesizes distributor inventory, package-identical drop-in alternatives, and design notes not consolidated in the Microchip datasheet, giving repair engineers and sourcing teams a single actionable reference.

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PIC17C43-25/L - 8KB OTP 8-bit MCU 25MHz 44-PLCC | Microchip
PIC17C43-25/L

PIC17C43-25/L - 8KB OTP 8-bit MCU 25MHz 44-PLCC | Microchip

The Microchip Technology PIC17C43-25/L is a high-performance 8-bit CMOS EPROM/ROM microcontroller delivering 8.25 MIPS at 25 MHz (121 ns instruction execution) in a 44-pin PLCC package. It integrates 8 KB of OTP program memory (4K × 16), 454 bytes of general-purpose RAM, and 33 digital I/O pins. The /L suffix denotes the PLCC package option. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + RAM), and programmable I/O peripherals on one die. The PIC17C family sits above PIC16C and below PIC18 in Microchip's 8-bit hierarchy, offering extended instruction set support and upward compatibility with PIC16C5X, PIC12CXXX, and PIC16CXX devices. The PIC17C43 specifically adds hardware multiply, additional banking, and a wider 16-bit instruction word to accelerate math-intensive control loops. In the broader taxonomy: microcontroller → 8-bit MCU → CMOS RISC microcontroller → embedded controller → semiconductor. Key features include a 16-bit instruction word with only 58 single-word instructions, a 25 MHz internal clock yielding 121 ns minimum instruction cycle, hardware multiply, two 8-bit timers plus one 16-bit timer/counter, a USART, PWM module, watchdog timer with on-chip RC oscillator, and Power-On Reset (POR). The OTP program memory supports prototyping and low-to-medium volume production, while the wide operating voltage range of 4.5 V to 6 V covers standard 5 V logic rails. Architecturally, the PIC17C43 uses a Harvard RISC core with separated program and data buses, enabling simultaneous instruction fetch and operand access. The 25 MHz / 25MIPS figure corresponds to the -25 speed grade; a -33 variant runs the same die at 33 MHz. CMOS EPROM cells provide non-volatile code storage but require UV erasure, making the part best suited to one-time-programmed production units rather than firmware-update applications. Typical applications include industrial motor control, smart sensors, HVAC controllers, automotive body electronics (non-safety), and embedded control where deterministic 8-bit performance is sufficient. The PIC17C43 is recommended for designs migrating from PIC16C5X/PIC16CXX that need more code space and arithmetic throughput. Microchip recommends the PIC18F4220 as a newer Flash-based replacement for new designs. When designing with PIC17C43-25/L, ensure the 5 V supply is well-regulated and bypassed with 0.1 µF + 10 µF capacitors near the VDD pins. The /L PLCC package requires a socket or proper reflow profile; because the OTP die cannot be reprogrammed, prototype code on a JW (windowed) ceramic part before committing to plastic PLCC production units. This page synthesizes distributor pricing, same-family drop-in alternatives in the 44-PLCC footprint, and practical OTP-vs-Flash migration notes not collected in the manufacturer datasheet alone.

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PIC17C43-25/P - 8-bit 25MHz OTP MCU 8KB | Microchip
PIC17C43-25/P

PIC17C43-25/P - 8-bit 25MHz OTP MCU 8KB | Microchip

The Microchip Technology PIC17C43-25/P is an 8-bit CMOS EPROM/ROM-based microcontroller in the PIC17C family, delivering 8.25 MIPS (121 ns instruction execution) with 58 single-word instructions. It integrates 8 KB (4K x 16) of OTP program memory, 454 bytes of RAM, and 33 digital I/O pins in a 40-pin PDIP through-hole package, clocked at up to 25 MHz from a 4.5 V to 6 V supply. The device targets applications needing more horsepower than the PIC16C family while remaining code-compatible with PIC16C5X, PIC12CXXX, and PIC16CXX predecessors. A microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripherals. The PIC17C family occupies the high-performance tier of Microchip's 8-bit portfolio, above PIC12C/PIC16C baseline parts but below the PIC18 generation. This hierarchy (MCU -> 8-bit MCU -> PIC architecture -> PIC17C family) makes the PIC17C43 a bridge device for designs migrated from PIC16C that need higher throughput, more memory, or more I/O. Key features include 8 KB OTP program memory, 454 bytes of general-purpose RAM, 33 I/O pins with programmable direction, multiple timer/counter modules, a synchronous/asynchronous serial port (USART/SCI), and an 8-bit parallel slave port. The 25 MHz oscillator input yields 8.25 MIPS throughput, and the 16-bit instruction bus with Harvard architecture supports single-cycle execution for most opcodes. Brown-out reset and watchdog timer options are available via configuration bits. The PIC17C43-25/P uses Microchip's classic RISC PIC core with separate program and data buses, an 8-level hardware stack, and dual-ported RAM for fast context switching. The OTP memory (one-time programmable) is suited for low-to-medium production volumes where mask-ROM volumes are uneconomical, while the 25 MHz speed grade reflects the mid-range operating frequency tier within the PIC17C43 family. Typical applications include industrial control, motor control, instrumentation, automotive subsystems, and embedded control boards where higher computational throughput than PIC16C is required. The wide 4.5 V to 6 V supply range supports both regulated 5 V systems and battery-backed designs. Legacy replacement designs migrating to PIC18F parts often retain PIC17C43 firmware layouts. When designing with this part, ensure the OTP programming step is included in your manufacturing flow. For new designs, Microchip recommends PIC18F4220 (Flash-based, in-circuit programmable) as the modern replacement with broader tool support and active supply status. This page synthesizes distributor pricing, OTP vs Flash replacement guidance, and practical design notes not found in the manufacturer datasheet alone, helping engineers decide whether to stay with PIC17C43-25/P or migrate to PIC18F4220.

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PIC17C43-25/PT - 8.25 MIPS 8-bit OTP MCU, 8KB EPROM | Microchip
PIC17C43-25/PT

PIC17C43-25/PT - 8.25 MIPS 8-bit OTP MCU, 8KB EPROM | Microchip

The Microchip Technology PIC17C43-25/PT is a high-performance 8-bit CMOS EPROM/ROM-based microcontroller in the PIC17C family, delivering 8.25 MIPS (121 ns instruction cycle) at a 33 MHz clock input. The /PT suffix denotes a 44-pin TQFP surface-mount package rated for commercial temperature range (0C to +70C), with 8KB of on-chip EPROM program memory organized as 4K x 16 words. The device is supported by 454 bytes of general-purpose RAM, an 8-bit multiply instruction, and 58 single-word instructions with most executing in a single 121 ns cycle. An 8-bit microcontroller (MCU) is a single-chip computer with an 8-bit data path, ALU, registers, and on-chip program/data memory. The PIC17C43 sits at the high-performance end of Microchip's classic 8-bit OTP portfolio, one tier below the PIC18 family in capability but above the PIC16C5X/PIC12CXXX/PIC16CXX baselines. Program memory is OTP (one-time programmable) EPROM, placing this part in the 'high-performance 8-bit MCU' hypernym tree: 8-bit MCU -> microcontroller -> embedded controller -> semiconductor IC. Key features include 33 MHz maximum clock input, 121 ns instruction cycle for single-cycle instructions (200 ns for branches and table reads/writes), 8-level deep hardware stack, 16-bit wide instruction word, peripheral features such as a multi-channel 10-bit-resolution ADC, USART, capture/compare/PWM modules, and parallel slave port. Brown-out reset, watchdog timer, and code protection are standard. The TQFP-44 package gives 33 programmable I/O lines across two ports, suitable for medium-density embedded systems. Architecturally, the PIC17C43 uses a Harvard-style RISC core with separate program and data buses, a 16-bit instruction word fetched every cycle, and a hardware multiply that completes in a single 8-bit x 8-bit operation. The 25 speed grade corresponds to 25 MHz maximum oscillator frequency; the closely-related 33 MHz grade is sold as PIC17C43-33/PT. Power consumption is typically under 50 mA at full speed from a 5V supply. Typical applications include industrial control panels, motor control firmware, instrumentation, and embedded legacy systems where OTP, deterministic timing, and a robust instruction set are valued over flash reprogrammability. Microchip recommends the modern PIC18F4220 as the recommended successor for new designs; the PIC17C43 itself remains in production for long-life-cycle and form-fit-function drop-in maintenance. When designing with this device, plan for a one-time-programmable EPROM programming step in production - field firmware updates are not possible without device replacement. Ensure the oscillator configuration bits match the chosen clock source and that brown-out-reset voltage is set above the minimum Vdd of 4.5V required for EPROM operation. This page synthesizes distributor pricing, pin-compatible drop-in alternatives (PIC17C43T-25/PT, PIC17C43-25I/PT, PIC17C43-16/PT), and practical design notes not found in the manufacturer datasheet alone.

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