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PIC17C42A-25I/PT - 8-Bit 25MHz 4KB OTP MCU 44-TQFP | Microchip
PIC17C42A-25I/PT

PIC17C42A-25I/PT - 8-Bit 25MHz 4KB OTP MCU 44-TQFP | Microchip

The Microchip Technology PIC17C42A-25I/PT is an 8-bit RISC CMOS OTP microcontroller in the PIC17C family, delivering 8.25 MIPS (121 ns instruction cycle) at 25 MHz in a 44-pin TQFP (10x10 mm) industrial-temperature package. It integrates 4 KB (2K x 16) of OTP program memory and 232 bytes of general-purpose RAM, with 33 digital I/O lines, an external oscillator interface, and Microchip's powerful PIC instruction set containing 58 single-word instructions. The '25' speed suffix denotes a 25 MHz maximum clock, and the 'I' suffix indicates the -40C to +85C industrial temperature range. Background: an 8-bit microcontroller (MCU) is a single-chip computer containing a CPU, program memory, RAM, and peripheral I/O on one die, intended for embedded control tasks. The PIC architecture is a Harvard RISC design with separate program and data buses, and PIC microcontrollers occupy the hypernym hierarchy: MCU -> microcontroller -> 8-bit microcontroller -> RISC microcontroller -> embedded controller -> semiconductor. OTP (One-Time-Programmable) EPROM-based MCUs such as the PIC17C42A were Microchip's workhorse mid-1990s devices for cost-sensitive production runs that did not require field re-programmability. Key features include 8.25 MIPS peak throughput, 33 I/O pins grouped across multiple ports, a multiply instruction in hardware, 16-bit instructions/8-bit data path, and up to four timer/counter modules (specific timer count not in the verified data). The device supports external oscillator and crystal modes and is pin-compatible with the broader PIC17C4X family, simplifying migration. According to the verified web data, Microchip's product page indicates a newer replacement: the PIC18F4220 flash-based MCU is recommended for new designs. Typical applications for this device include industrial control boards, motor-control front-ends, instrumentation, and legacy embedded systems where OTP cost advantages outweigh field-update flexibility. Designers working on legacy products, repair, or maintenance of installed PIC17C42A-based equipment often source this part directly. When designing with this part, allocate one decoupling 100 nF ceramic capacitor per VDD pin and place it within 5 mm of the pin. Note that the PIC17C42A is OTP - firmware must be fully validated before programming, as it cannot be erased. For new designs, Microchip recommends migrating to the PIC18F4220 (or similar PIC18F family) which adds flash memory, more RAM, and modern peripherals while maintaining upward compatibility.

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PIC17C42A-33/L - 8-bit 33MHz 4KB OTP MCU 33 I/O | Microchip
PIC17C42A-33/L

PIC17C42A-33/L - 8-bit 33MHz 4KB OTP MCU 33 I/O | Microchip

The Microchip Technology PIC17C42A-33/L is a high-performance 8-bit CMOS OTP microcontroller from the PIC17C family, offering 8.25 MIPS throughput at 33 MHz with 121 ns instruction execution in a 44-pin PLCC (J-Lead) package. It integrates 4 KB (2K x 16) of One-Time-Programmable program memory, 232 bytes of RAM, and 33 digital I/O pins, providing upwards code compatibility with PIC16C5X, PIC12CXXX, and PIC16CXX devices. The /L suffix indicates the industrial operating temperature range. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/OTP/Flash), data RAM, and peripheral interfaces onto one die. PIC microcontrollers use a Harvard RISC architecture with a small, fixed instruction set optimized for deterministic embedded control. MCUs sit at the lowest tier of the embedded-compute hierarchy: MCU -> microcontroller -> embedded processor -> semiconductor IC. They differ from microprocessors (MPUs) by integrating non-volatile memory and peripherals on-chip, eliminating external bus complexity for compact, low-power designs. Key features of the PIC17C42A-33/L include the PIC17C's enhanced 8-bit core, hardware multiplier, expanded peripheral set (including a USART, capture/compare/PWM, and multiple timers), and 33 bidirectional I/O lines capable of sourcing/sinking 25 mA per pin. The 33 MHz clock rate and 16-bit wide program bus yield 8.25 MIPS, more than doubling PIC16 throughput. Wide operating voltage (4.5 V to 6.0 V typical for the OTP variant) and low power consumption suit battery and line-powered products alike. The architecture combines a 16-bit program bus with an 8-bit data bus, allowing single-cycle 16-bit instruction fetches while preserving 8-bit ALU throughput. The high-current I/O pins can directly drive LEDs, relays, and triac interfaces, reducing external driver circuitry. The PIC17C4X instruction set adds hardware multiply and a 16-bit program counter for C-language efficiency. Typical applications include industrial control systems, motor control, LED display drivers, appliance controllers, smart sensors, and embedded instrumentation. The PIC17C42A-33/L is also well suited to prototyping designs that later migrate to flash-based PIC18F successors (Microchip recommends the PIC18F4220 as the modern functional replacement). When designing with this OTP part, plan code development with a windowed UV-erasable PIC17C42A-16/P before committing to one-time-programmed production units. Decoupling the VDD/VSS pair with 0.1 uF ceramics and reserving RA4 as an open-drain output are common pitfalls to avoid. Page referenced: PIC17C4X preliminary data sheet (DS30412C). This page synthesizes distributor stock and pricing from DigiKey, Mouser, Bonchip, Kynix, and Hotenda, plus pin-compatible PIC17C family alternatives and practical design notes not found in the original manufacturer datasheet.

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PIC17C42A-33/PQ - 33MHz 8-bit OTP MCU 4KB | Microchip
PIC17C42A-33/PQ

PIC17C42A-33/PQ - 33MHz 8-bit OTP MCU 4KB | Microchip

The Microchip Technology PIC17C42A-33/PQ is an 8-bit CMOS One-Time-Programmable (OTP) RISC microcontroller built around Microchip's PIC17C architecture, delivering 8.25 MIPS (121 ns instruction execution) with a 33 MHz external oscillator and 4 KB (2K x 16) of program memory plus 232 bytes of RAM, housed in a 44-pin MQFP (Metric Quad Flat Pack) package. It exposes 33 general-purpose digital I/O pins organized across multiple ports, supports an external oscillator input, and provides the classic PIC17C42A peripheral set: timer/counter modules, a hardware USART, capture/compare/PWM, and an 8-bit parallel slave port. Background knowledge - what is an 8-bit OTP microcontroller? An 8-bit MCU (microcontroller) is a single-chip computer with an 8-bit data path, integrating CPU, RAM, ROM/Flash/OTP program memory, and peripherals. OTP (One-Time-Programmable) program memory uses fusible-link or anti-fuse cells that can be written exactly once after manufacture - cheaper than Flash for low-to-medium volume production and ideal for stable, mature firmware. Within the broader taxonomy, the PIC17C42A belongs to: 8-bit MCU -> RISC microcontroller -> Harvard-architecture MCU -> PIC17C family -> CMOS OTP class, and is the predecessor family that influenced the modern PIC18F architecture. Key features include 121 ns instruction cycle at 33 MHz (8.25 MIPS throughput), 4 KB OTP program memory, 232 x 8 RAM, 33 I/O lines, an external-oscillator interface, a USART serial port, and an 8-bit parallel slave port. The PIC17C42A (Rev. A) conforms functionally to the PIC17C4X preliminary datasheet (DS30412C). Microchip officially notes that a newer device is available - the PIC18F4220 - for new designs; the PIC17C42A remains in stock at franchised distributors but is recommended primarily for legacy maintenance and existing designs. Technical depth: the PIC17C42A uses a 16-bit-wide instruction word stored in OTP, with a Harvard bus that lets the CPU fetch an instruction and read a data byte in the same cycle. The 58 single-word instruction set keeps code density high. The wide 40- or 44-pin package and 33 I/O lines make the part suitable for applications that need many parallel digital signals without an external bus expander. Typical applications include industrial control boards, motor control front-ends, instrument front panels, embedded serial-control nodes, and legacy PIC16C5X/PIC12CXXX/PIC16CXX upgrades that need more I/O. This page synthesizes distributor pricing, drop-in alternatives, and design notes that the legacy datasheet alone does not compile.

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PIC17C42A-33/PT - 8-Bit 33MHz OTP MCU 4KB | Microchip
PIC17C42A-33/PT

PIC17C42A-33/PT - 8-Bit 33MHz OTP MCU 4KB | Microchip

The Microchip Technology PIC17C42A-33/PT is an 8-bit, 33 MHz, high-performance CMOS EPROM/ROM-based microcontroller housed in a 44-pin TQFP (PT) surface-mount package. It delivers 8.25 MIPS throughput (121 ns instruction cycle), integrates 4 KB of program memory organized as 2K x 16 OTP, and includes 232 bytes of general-purpose SRAM and 33 digital I/O pins. The architecture provides 58 single-word instructions, all executed in a single cycle except for program branches and table reads/writes, which take two cycles (160 ns). An 8-bit microcontroller is a microprocessor optimized for embedded control, integrating CPU core, program memory, data RAM, and peripherals on a single die. Within the embedded hierarchy it sits as a small-form-factor, deterministic alternative to 16- and 32-bit MCUs and to microprocessors that lack on-chip memory. Microcontrollers (MCUs) belong to the broader category of microprocessors and ultimately to semiconductors and integrated circuits. The PIC17C family extends the PIC16C5X/PIC16CXX instruction set upward, providing PIC16C source-level compatibility while adding hardware multipliers, multiple interrupt vectors, and a wider 16-bit instruction word. Key features include a maximum clock input of 33 MHz, an instruction cycle of 121 ns at that frequency, four crystal oscillator modes (LP, XT, RC, HS), and a wide 4.5 V to 5.5 V commercial operating voltage. Peripheral highlights are an 8-bit timer/counter with 8-bit prescaler, a 16-bit timer/counter with 4-bit prescaler, a watchdog timer with on-chip RC oscillator, capture/compare/PWM module, dual analog comparators, and a USART with on-chip baud-rate generator. Typical applications include industrial control logic, instrumentation front-ends, automotive body controllers, motor-drive interface boards, smart sensor hubs, and legacy PIC16C system upgrades that need extra throughput and pins without retooling the codebase. Design consideration: OTP memory is one-time programmable; for development use the PIC17C42A-33/PT windowed CERDIP variant or an equivalent flash device such as PIC18F4220. This page aggregates pricing, drop-in compatible TQFP-44 alternatives, and engineering guidance drawn from manufacturer datasheets, application notes, and distributor listings.

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PIC17C42A-33E/L - 8-Bit 33MHz OTP MCU 4KB 44-PLCC | Microchip
PIC17C42A-33E/L

PIC17C42A-33E/L - 8-Bit 33MHz OTP MCU 4KB 44-PLCC | Microchip

The Microchip Technology PIC17C42A-33E/L is an 8-bit CMOS OTP (One-Time-Programmable) microcontroller from the PIC17C family, delivering 8.25 MIPS at a 33 MHz maximum clock speed in a 44-pin PLCC (J-Lead) package. The 'E' suffix denotes the extended industrial temperature grade (-40C to +125C) and the 'L' suffix indicates the lead-free, 44-PLCC surface-mount form factor. A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and peripheral interfaces into one IC. The PIC17C42A family sits in the mid-range tier of Microchip's 8-bit PIC architecture hierarchy - above PIC16C5X baseline parts and below PIC18C enhanced devices. PIC17C MCUs are built around a 16-bit-wide instruction word (2K x 16 = 4 KB OTP program memory) with an 8-bit data path, providing roughly double the code density and arithmetic throughput of the PIC16C baseline family while remaining assembly-source compatible upwards into PIC18C and later PIC18F flash parts. Key features include 4 KB (2K x 16) OTP program memory, 232 x 8 bytes of general-purpose RAM, 33 digital I/O lines, and on-chip peripherals such as a Universal Synchronous/Asynchronous Receiver-Transmitter (USART), Pulse Width Modulation (PWM) module, Watchdog Timer (WDT), and Power-On Reset (POR). An external oscillator input supports crystals, resonators, or external clock sources up to 33 MHz, and the device operates across a 4.5 V to 6.0 V supply range typical for early-1990s CMOS MCUs. Architecture-wise, the PIC17C42A uses a RISC-style Harvard design with 58 single-word instructions, single-cycle instruction decode, and a 121 ns minimum instruction execution time at 33 MHz. The Harvard split between 16-bit program memory and 8-bit data RAM eliminates the von Neumann fetch bottleneck, and a hardware multiply option accelerates integer math. Compared with PIC16C5X parts at the same clock, the PIC17C42A typically delivers 2x-4x higher sustained throughput, which is why it was positioned for more demanding embedded applications in the mid-1990s. Typical applications include industrial control systems, motor and stepper control, smart sensor interfaces, instrumentation, and embedded communication controllers. The wide industrial temperature range makes the 'E' grade suitable for factory-floor equipment and outdoor enclosures, while the PIC18F4220 is recommended as the modern flash-reprogrammable migration target for new designs. Because PIC17C42A is OTP, firmware is locked at wafer programming, so this part is best suited for high-volume production runs where code does not change in the field. When designing with the PIC17C42A-33E/L, budget PCB area for the 44-PLCC socket or reflow footprint, decouple VDD with a 0.1 uF ceramic plus 10 uF tantalum, and ensure the oscillator trace is short and guarded to avoid noise pickup at 33 MHz. For new designs Microchip explicitly recommends migrating to PIC18F4220, which is flash-based, pin-compatible in many board layouts, and supported by current MPLAB X toolchains. This page synthesizes distributor pricing, drop-in alternatives within the PIC17C family, and practical design notes not found on the manufacturer datasheet front page.

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PIC17C42A-33E/P - 33MHz 8-bit OTP MCU, 4KB, 40-PDIP | Microchip
PIC17C42A-33E/P

PIC17C42A-33E/P - 33MHz 8-bit OTP MCU, 4KB, 40-PDIP | Microchip

The Microchip PIC17C42A-33E/P is an 8-bit CMOS microcontroller with 33 MHz maximum operating speed, 4 KB (2K x 16) of One-Time Programmable (OTP) program memory and 232 x 8 bytes of RAM, housed in a 40-pin PDIP (through-hole) package. The part belongs to the PIC17C family, Microchip's high-performance 8-bit RISC architecture, which executes 121 ns single-word instructions and delivers 8.25 MIPS throughput from a 33 MHz clock. The device integrates 33 digital I/O lines and supports connectivity via a hardware UART/USART block plus on-chip PWM, Power-On Reset (POR) and Watchdog Timer (WDT). A microcontroller (MCU) is a single-chip computer that combines a CPU core, non-volatile program memory, working RAM, and peripheral blocks such as timers, communications interfaces and analog converters. The PIC17C42A sits inside the 8-bit MCU category, beneath Microchip's 16-bit PIC24 and dsPIC families and far below the 32-bit PIC32 line. Within the PIC17C sub-family it is the entry-level OTP die, making it a stepping stone between the baseline PIC16C5X/PIC16CXX devices and the higher-pin-count PIC17C43/44 members. Key features include 8.25 MIPS peak throughput (121 ns instruction cycle), 33 MHz maximum clock, 4 KB OTP program memory organised as 2K x 16, 232 bytes of general-purpose RAM, 33 I/O pins, hardware USART, PWM module, watchdog timer with its own on-chip RC oscillator, and selectable oscillator options (external clock or crystal/resonator). The extended ('E') temperature grade supports -40C to +125C operation, suitable for industrial environments. Technically, the PIC17C42A uses a 16-bit instruction word with an 8-bit data path, a 16-level hardware stack, and a vectored interrupt controller. Its OTP EPROM cell allows one-time programming in volume production; in-circuit programming is not supported because there is no flash. Designers should therefore plan for a pre-programmed, socketed part or a UV-erasable windowed variant (PIC17C42A with JW package) during development. Typical applications include industrial control boards, motor drive front-ends (using the PWM module), UART-linked sensor hubs, white-goods and appliance controllers, and legacy embedded designs migrating from PIC16C5X to a higher-performance RISC core. The wide temperature range makes it suitable for outdoor or automotive under-hood subsystems where extended-grade parts are required. When designing with this part, pay attention to oscillator selection: an external clock or crystal/resonator must be supplied because the PIC17C42A has no internal oscillator. Programming requires a Microchip-supported device programmer because OTP memory cannot be re-programmed in circuit, and production units must be sourced pre-programmed or programmed by a Microchip programming partner. This page synthesizes distributor pricing, drop-in alternative listings (including the recommended PIC18F4220 migration path), and practical design notes that are not collected in a single place in the manufacturer datasheet.

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PIC17C42A-33E/PT - 33MHz 8-bit OTP MCU, 4KB, 44-TQFP | Microchip
PIC17C42A-33E/PT

PIC17C42A-33E/PT - 33MHz 8-bit OTP MCU, 4KB, 44-TQFP | Microchip

The Microchip Technology PIC17C42A-33E/PT is an 8-bit CMOS microcontroller built on the PIC17C architecture, integrating 4KB (2K x 16) of One-Time Programmable (OTP) program memory, 232 bytes of RAM, and 33 general-purpose digital I/O lines in a 44-pin TQFP (PT) surface-mount package. It executes instructions at 8.25 MIPS (121 ns minimum instruction cycle) from a 33 MHz external clock, making it one of the highest-throughput 8-bit PIC microcontrollers of its generation and a frequent successor to PIC16C5X/PIC16CXX designs. An 8-bit microcontroller (MCU) is a single-chip computer that combines a CPU, non-volatile program memory, volatile data memory, and peripherals around an 8-bit data bus. Within the power management and embedded hierarchy, MCUs sit at the edge of the system alongside sensors and actuators: microcontroller -> embedded controller -> system-on-chip -> integrated circuit. PIC17C-family devices use a RISC instruction set with only 58 single-word instructions and are upwards source-compatible with the PIC16C5X, PIC12CXXX, and PIC16CXX devices. Key features of the PIC17C42A include a 16-bit instruction word, an 8-level hardware stack, multiple interrupt sources with prioritized vectored interrupts, a watchdog timer, and a programmable code-protection mechanism on the OTP array. The device also integrates a timer/counter module with capture/compare/PWM capability, a synchronous serial port (SSP) compatible with SPI and I2C, and a USART for asynchronous serial communication. The PT suffix denotes a 44-lead Thin Quad Flat Pack (TQFP, 10x10 mm body), engineered for surface-mount assembly in automated production lines. Operating voltage is 5V typical from a 4.0-6.0V supply range across the industrial -40C to +125C temperature window. The "E" speed/temperature designator indicates the Enhanced industrial grade, while "33" specifies the 33 MHz maximum oscillator frequency. Typical applications for the PIC17C42A-33E/PT include industrial control systems, automotive body and chassis electronics, smart sensor interfaces, motor control front-ends, and embedded communication bridges. Its 33 I/O pins and PWM/timer resources make it well-suited to driving relays, LEDs, small brushed DC motors, and UART-connected peripherals in space-constrained designs. When designing with this part, note that OTP memory cannot be reprogrammed in-circuit; for prototype iteration, choose the PIC17CR42 (ROM) or windowed EPROM variant. Decoupling VDD/VSS with 100 nF ceramic capacitors placed within 5 mm of each supply pin is strongly recommended, and unused I/O pins should be configured as outputs low to minimize power consumption. This page synthesizes distributor pricing, drop-in PIC17C family alternatives, lifecycle status, and practical design notes that go beyond the bare datasheet to help engineers evaluate the PIC17C42A-33E/PT for both new designs and legacy maintenance.

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PIC17C42A-33I/L - 8-Bit 33MHz OTP MCU, 4KB | Microchip
PIC17C42A-33I/L

PIC17C42A-33I/L - 8-Bit 33MHz OTP MCU, 4KB | Microchip

The Microchip Technology PIC17C42A-33I/L is a high-performance 8-bit CMOS EPROM/ROM microcontroller from the PIC17C family, operating at up to 33 MHz with a 121 ns single-cycle instruction execution time. It integrates 4 KB of OTP program memory (2K x 16 organization), 232 bytes of general-purpose RAM, 33 digital I/O pins, and is housed in a 44-pin PLCC (J-Lead) package rated for the industrial temperature range (-40C to +85C). The device belongs to the PIC17C4X family and uses an external oscillator input. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces onto one piece of silicon. Within the broader semiconductor taxonomy, a microcontroller is a sub-class of microprocessor that targets embedded control rather than general-purpose computing; the 8-bit class, to which the PIC17C42A belongs, occupies the entry-to-mid level of performance and emphasizes deterministic instruction timing, low pin count, and cost-sensitive integration. The PIC17C4X specifically extended Microchip's baseline PIC16C5X/PIC16CXX architecture with a wider instruction word and a higher 33 MHz clock ceiling. Key features include an 8.25 MIPS peak throughput, 58 single-word instructions for fast code development, hardware multiply and divide support, a four-channel 8-bit ADC, dual analog comparators, three timer/counter modules (Timer0/Timer1/Timer2), a Universal Synchronous Asynchronous Receiver-Transmitter (USART), and a Capture/Compare/PWM (CCP) peripheral. The 16-bit-wide instruction word and 8-bit data path give the family a RISC-flavored execution model while remaining source-compatible with the PIC16 midrange instruction set. The PIC17C42A is implemented in CMOS technology with an EPROM/OTP program cell, allowing one-time programmable code storage in production. Its 12-bit-wide instruction bus, 8-bit data ALU, and Harvard architecture let the CPU fetch instructions and data in parallel, which is why most instructions complete in a single 121 ns cycle. Program branches and table reads/writes extend to two cycles, an architectural detail engineers use when bounding interrupt latency. Typical applications include industrial control subsystems, motor drive signal conditioning, instrumentation front ends, white-goods and appliance controllers, and legacy embedded designs where the PIC17C4X architecture is already in use. The wide temperature grade and the through-hole-friendly PLCC-44 package make it especially suitable for factory-floor equipment and field-replaceable modules. Microchip's own product page recommends migrating to the PIC18F4220 for new designs, since the PIC17C42A is no longer in active production. When designing with this part, plan for a 5V supply and ensure the external oscillator is matched to the 33 MHz maximum clock. Decouple VDD with 0.1 uF ceramic capacitors placed within 5 mm of each power pin, and reserve the MCLR pin for a proper reset network. Because the part is OTP, firmware must be fully validated before programming - there is no in-circuit reprogramming. This page synthesizes distributor stock signals, current pricing tiers, a curated set of drop-in compatible alternatives, and practical design notes that go beyond the manufacturer datasheet, giving engineers and procurement teams a single decision-ready reference.

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PIC17C42A-33I/P - 33MHz 8-bit OTP MCU 4KB | Microchip
PIC17C42A-33I/P

PIC17C42A-33I/P - 33MHz 8-bit OTP MCU 4KB | Microchip

The Microchip Technology PIC17C42A-33I/P is a high-performance 8-bit RISC microcontroller from the PIC17C family, executing instructions at up to 33 MHz with a 121 ns instruction cycle. It integrates 4 KB (2K x 16) of One-Time-Programmable (OTP) program memory, 232 bytes of data RAM, and 33 digital I/O pins in a 40-pin PDIP through-hole package, rated for industrial temperature operation from -40C to +85C. The PIC family (Peripheral Interface Controller) is a category of 8-bit RISC microcontrollers originally developed by General Instrument and now owned and evolved by Microchip Technology. PIC microcontrollers use a Harvard architecture with separate program and data buses, enabling single-cycle instruction fetch plus operand read for predictable execution timing. The PIC17C subgroup within PIC was the first PIC family to deliver MIPS-class (millions of instructions per second) throughput to 8-bit applications, enabling complex control loops, encoder interfaces, and multi-axis motor control. Key features of the PIC17C42A include an 8.25 MIPS instruction throughput at 33 MHz, a 16-bit instruction word, 8-level hardware stack, a 16-bit timer/counter with 8-bit prescaler, two 8-bit timer/counters, hardware USART with 9-bit address support, two analog comparators, capture/compare/PWM (CCP) modules, and a watchdog timer with on-chip oscillator. The instruction set contains only 58 single-word instructions, and the device is fully upwards compatible with the PIC16C5X, PIC12CXXX, and PIC16CXX families. Typical applications include industrial automation controllers, motor control front-ends, automotive body electronics, office equipment, sensor signal conditioning, and instrumentation. The high-throughput 8-bit core makes it well-suited to PID loops, encoder pulse counting, and protocol bridging tasks where deterministic timing matters more than raw word width. When designing with this device, note that OTP memory is programmed once and cannot be erased; for field-upgradable firmware consider the PIC18F or PIC16F flash-based equivalents. Provide adequate decoupling on VDD and AVSS pins and respect the 5V supply tolerance; this is not a 3.3V-tolerant part. The OEM programmer support (MPLAB-ICD, PRO MATE) is mature but the silicon is mature lifecycle and not recommended for new designs - Microchip recommends PIC18F4220 as the modern successor.

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PIC17C42A-33I/PQ - 33MHz 8-bit OTP MCU 4KB | Microchip
PIC17C42A-33I/PQ

PIC17C42A-33I/PQ - 33MHz 8-bit OTP MCU 4KB | Microchip

The Microchip Technology PIC17C42A-33I/PQ is a high-performance 8-bit CMOS EPROM/ROM-based microcontroller from the PIC17C family, offering 33 MHz operation with a 121 ns instruction cycle and 4 KB (2K x 16) of One-Time-Programmable (OTP) program memory. Housed in a 44-pin MQFP (PQ) package with 33 digital I/O lines, this device targets legacy industrial control and embedded systems where deterministic instruction timing and field-programmable OTP are required. The "33I" suffix denotes the 33 MHz clock speed and industrial temperature range (-40C to +85C), while "/PQ" specifies the 44-pin Metric Quad Flat Pack with J-lead termination. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripherals on one die; the PIC17C42A is specifically a classic accumulator-based PIC architecture with only 58 single-word instructions (excluding two-cycle branches and table reads/writes). Within Microchip's hierarchy, it sits between the PIC16 family and the PIC18 family, providing upwards compatibility with PIC16C5X, PIC12CXXX, and PIC16CXX devices while remaining supported by the original MPASM toolchain and PICSTART Plus programmers. Key features include 232 x 8 bytes of general-purpose RAM, an external oscillator interface, hardware timer/counter peripherals, and instruction pipelining that yields 8.25 MIPS throughput. The 33 MHz oscillator clock with 4:1 divider delivers 121 ns instruction execution, and the 16-bit-wide program memory word (14-bit opcode) provides richer instruction encoding than the PIC16 baseline. The 33 I/O pins are grouped into ports supporting digital I/O with internal weak pull-up options typical of the PIC17C family. The architecture utilizes a Harvard memory structure with separated program and data buses, allowing instruction fetch and execution in the same cycle for all single-cycle instructions. The 4 KB OTP program memory supports in-system programming via Microchip's standard ICSP protocol available on the PIC17C4X family, while the 232-byte data RAM is split into general-purpose and special-function register banks accessible via bank-switching instructions. Typical applications include industrial automation controllers, motor control sequencing logic, automotive body electronics subsystems, vending and POS terminal controllers, and legacy retrofit boards where a 5V-tolerant, 33 MHz 8-bit PIC MCU with 33+ I/O and OTP flexibility is required. The wide industrial temperature range and J-lead surface-mount termination also support ruggedized process control equipment. When designing with the PIC17C42A-33I/PQ, designers should note that this is an OTP-based legacy part superseded by the flash-based PIC18F family. For new designs, Microchip explicitly recommends the PIC18F4220 as the modern replacement; for existing designs, ensure ICSP programming header access is preserved. Decoupling on VDD with a 0.1 uF ceramic capacitor placed within 5 mm of each VDD pin is recommended to suppress noise during high-speed instruction execution. This page synthesizes distributor pricing, parametrically-matched drop-in alternatives, and practical design considerations not found in the bare manufacturer datasheet.

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PIC17C42AT-16/PQ - 8-Bit 16MHz OTP MCU 4KB | Microchip
PIC17C42AT-16/PQ

PIC17C42AT-16/PQ - 8-Bit 16MHz OTP MCU 4KB | Microchip

The Microchip PIC17C42AT-16/PQ is an 8-bit PIC® 17C microcontroller with a 16MHz core, 4KB (2K x 16) of One-Time Programmable (OTP) program memory, and 232 bytes of RAM, housed in a 44-pin MQFP (10x10 mm) package. The "T" suffix denotes the OTP program-memory variant and the "-16" speed grade indicates a 16MHz maximum operating frequency, while "/PQ" specifies the Metric Quad Flat Package with gull-wing leads. An 8-bit microcontroller (MCU) is a programmable single-chip computer that integrates a CPU, memory, and peripherals on one die. The PIC17C family sits in Microchip's high-performance 8-bit tier, between the mid-range PIC16 and the 16-bit dsPIC/PIC24 architectures, and is designed for applications that need more code space and I/O than the PIC16 family while staying within an 8-bit instruction set. The 17C42A specifically targets legacy industrial control, instrumentation, and embedded designs where EPROM/OTP program memory is acceptable. Key features include an enhanced 8-bit RISC architecture with a 16-bit instruction word, 33 single-cycle instructions, a programmable 16-level hardware stack, and up to 33 digital I/O pins. The PIC17C42AT-16/PQ integrates a watchdog timer, brown-out reset, power-on reset, and a 16-bit timer/counter with capture/compare, enabling deterministic closed-loop control without external components. The RISC-like architecture yields typical throughputs approaching 5 MIPS at the 16MHz clock, suitable for real-time control loops. Typical applications include industrial motor control, smart instrumentation, automotive body electronics (legacy designs), sensor signal conditioning, and embedded control boards in factory automation. It is also used in printers, scanners, and consumer appliances that require deterministic 8-bit control. For new designs, Microchip recommends the PIC18 family; the PIC17C42A is generally maintained for legacy support and pin-compatible board refreshes. Designers should note that OTP memory can only be programmed once, so this part is suited to production runs where code is finalized. Decoupling requires 100nF + 10uF near VDD/VSS pins, and the MCLR reset pin must be pulled high through a resistor. Programming is performed via the high-voltage ICSP interface; in-circuit debugger support is limited on OTP devices.

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PIC17C42AT-16E/L - 8-Bit 16MHz 4KB OTP MCU 44-PLCC | Microchip
PIC17C42AT-16E/L

PIC17C42AT-16E/L - 8-Bit 16MHz 4KB OTP MCU 44-PLCC | Microchip

The Microchip Technology PIC17C42AT-16E/L is an 8-bit PIC17C-series microcontroller featuring a 16 MHz maximum clock speed, 4 KB (2K x 16) of One-Time Programmable (OTP) program memory, and 232 x 8 bytes of RAM, housed in a 44-pin PLCC (16.59 x 16.59 mm) surface-mount package with J-leads. The device operates from a 4.5 V to 6.0 V supply and is rated for the -40 °C to +125 °C industrial/automotive temperature range, making it suitable for harsh-environment embedded control. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/EPROM/OTP/Flash), data memory (RAM), and peripherals such as timers, I/O ports, and communication interfaces onto one die. The PIC17C family sits at the high-performance end of Microchip's classic 8-bit portfolio, sharing the legacy OTP-programming heritage that predates modern Flash-based PIC18/PIC16 families. Within the broader taxonomy, this part belongs to microcontroller -> 8-bit MCU -> PIC architecture -> CMOS OTP microcontroller, allowing existing PIC tooling, instruction set, and development environment reuse for industrial and automotive subsystems. Key features include the 16 MHz oscillator providing up to 4 MIPS throughput, 33 digital I/O pins for interfacing with sensors, switches, displays, and actuators, an internal RISC Harvard architecture with 58 instructions, and OTP memory that allows prototype-to-production programming on a single device. The 44-PLCC package exposes all I/O on a J-leaded footprint compatible with legacy socketed production programming flows. Power consumption is bounded by the 4.5-6.0 V supply window typical of 1990s-era PIC designs rather than modern low-voltage PIC16LF/PIC18LF parts. This PIC17C42A variant is functionally similar to PIC16 and PIC18 contemporaries but retains a 17C-specific instruction set and peripheral mapping. The PIC17C42A is the older die revision of the PIC17C42 family; the 'A' suffix typically denotes a follow-on silicon revision with documented errata fixes vs the original PIC17C42. Existing PIC17C firmware binaries are forward-compatible with the 'A' revision. Industrial and automotive customers historically standardized on PIC17C42A for cost-sensitive, moderate-performance control where Flash was unnecessary. Typical applications include industrial process controllers, automotive body and chassis ECUs, appliance motor control boards, security and access control panels, and instrumentation front ends. Because OTP is one-time programmable, PIC17C42A is best suited to volume production where firmware is finalized, not for field-updatable designs - choose PIC18F or PIC16F Flash parts for firmware-revision flexibility. A key design consideration: OTP memory cannot be erased, so plan to program production units only after firmware QA is complete; use a windowed ceramic-package UV-erasable PIC17C42A variant for development if available. Verify the 5 V supply tolerance against modern 3.3 V system rails - this part will not operate from a 3.3 V rail, so a level shifter or 5 V LDO is required when interfacing with 3.3 V logic. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on individual distributor listings, providing engineers a single-source reference for PIC17C42AT-16E/L sourcing and replacement decisions.

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PIC17C42AT-16E/PQ - 4KB OTP 8-Bit MCU, 16MHz, 44-MQFP
PIC17C42AT-16E/PQ

PIC17C42AT-16E/PQ - 4KB OTP 8-Bit MCU, 16MHz, 44-MQFP

The Microchip Technology PIC17C42AT-16E/PQ is an 8-bit RISC microcontroller from the PIC17C family, delivering 16 MIPS performance from a 16 MHz external oscillator core. It integrates 4 KB (2K x 16) of one-time programmable (OTP) program memory, 232 x 8 bytes of general-purpose RAM, and 33 digital I/O lines, all housed in a 44-pin Metric Quad Flat Pack (MQFP-44 / 10x10 mm) package supplied on Tape & Reel. What is an OTP microcontroller? An OTP microcontroller (One-Time Programmable) is a device that stores program code in a non-rewritable EPROM/EPROM-based memory cell, programmed once at production or in-circuit. The PIC17C42A belongs to the PIC17C4X high-performance 8-bit CMOS family, sitting between classical PIC16 and PIC18 architectures in the Microchip taxonomy. The Harvard architecture separates 16-bit program fetches from 8-bit data accesses via independent buses, enabling single-cycle instruction execution typical of the PIC17C series. Key features include a 16 MHz maximum clock (4 MHz input with 4x PLL option per family datasheet), 33 I/O pins, two 8-bit timers plus one 16-bit timer/counter, a USART with 9-bit address mode, 8-channel 8-bit A/D (family feature) and a wide operating voltage range typical of CMOS EPROM MCUs. The PIC17C42AT-16E/PQ 'E' suffix denotes the Extended industrial temperature grade (-40C to +125C), and the 'T' denotes Tape & Reel packaging. Typical applications include industrial control subsystems, motor control interfaces, sensor signal conditioning front-ends, smart instrumentation, automotive body electronics (non-safety) and embedded communication bridges. The 33 I/O count and USART support point to legacy designs where the PIC17C42A is used as a peripheral controller or a glue-logic replacement for discrete CMOS. Designers should treat OTP parts as write-once: confirm firmware with emulation (PIC17C43 with windowed EPROM) before committing to PIC17C42A production units. Provide a clean +5 V analog/digital supply rail with decoupling at VDD/VSS pins and respect the 33 I/O sink/source limits. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC17C42AT-16E/PT - 8-bit OTP MCU, 4KB EPROM, 16MHz, 44-TQFP | Microchip
PIC17C42AT-16E/PT

PIC17C42AT-16E/PT - 8-bit OTP MCU, 4KB EPROM, 16MHz, 44-TQFP | Microchip

The Microchip Technology PIC17C42AT-16E/PT is an 8-bit RISC microcontroller in the legacy PIC17C family, featuring 4KB (2K x 16) of one-time-programmable EPROM program memory, 232 bytes of data RAM, 33 digital I/O lines, and a 16MHz maximum clock speed, all housed in a 44-pin TQFP (PT) surface-mount package. The 'E' suffix denotes the Extended commercial temperature grade of -40C to +125C, and the 'T' suffix designates Tape & Reel packaging for high-volume assembly. The part uses an external oscillator source and provides a 16-bit instruction word with a RISC-style single-cycle execution pipeline. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, I/O peripherals, and timers onto one die; PIC17C-series MCUs are Microchip's high-performance 8-bit RISC family with a 16-bit instruction word and 8-bit data path, sitting in the hierarchy above PIC16 (mid-range) and below PIC18 (enhanced 8-bit) families. PIC17C42A is the entry-point device of the PIC17C line, designed for applications that need more throughput than PIC16 but pre-date the PIC18 migration. Key features include a 16MHz maximum operating frequency (4MHz system oscillator / 4), 8-level hardware stack, 33 I/O pins with high-current sink/source capability, multiple timer/counter peripherals, and a 16-bit wide instruction path for compact code density. The PIC17C42A Rev. A silicon includes documented errata clarifications against the preliminary PIC17C4X datasheet (DS30412C); users should consult the silicon errata document when programming peripheral registers. The 44-pin TQFP package provides a 0.80mm terminal pitch and integrated thermal dissipation through the lead frame. Typical applications include industrial control logic, legacy embedded systems, motor-control front-ends, instrumentation front panels, and cost-sensitive consumer electronics that required OTP programmability during the 1990s. Because the part is OTP (one-time-programmable), firmware must be fully verified before blowing the EPROM cells; field updates require device replacement. The 4KB program memory is sufficient for compact control loops, sensor interfaces, and serial-protocol stacks in resource-constrained designs. When designing with this device, verify supply voltage (4.5V to 5.5V typical) and oscillator stability; the external oscillator must drive the OSC1 pin within the datasheet AC timing budget. The 'E' temperature grade allows operation down to -40C, but the upper limit of +125C should be respected for thermal envelope. This page synthesizes distributor availability, same-package drop-in alternatives, and practical design notes not found in the legacy PIC17C4X preliminary datasheet alone.

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PIC17C42AT-16I/L - 8-Bit 16MHz OTP MCU, 4KB EPROM | Microchip | 44-PLCC
PIC17C42AT-16I/L

PIC17C42AT-16I/L - 8-Bit 16MHz OTP MCU, 4KB EPROM | Microchip | 44-PLCC

The Microchip Technology PIC17C42AT-16I/L is a high-performance 8-bit CMOS EPROM/ROM microcontroller from the PIC17C family, delivering 16 MHz core clock speed and 4 KB (2K x 16) of One-Time Programmable (OTP) program memory in a 44-pin PLCC (J-lead) package. It executes 58 single-word instructions, with a 121 ns instruction cycle for single-cycle instructions and two-cycle execution for program branches and table reads/writes. An MCU (microcontroller unit) is a single-chip computer that integrates a CPU core, program memory, working RAM, and configurable peripheral blocks such as timers, I/O ports, and communication interfaces. Within the broader taxonomy, the PIC17C42AT-16I/L sits as: MCU -> microcontroller -> embedded controller -> semiconductor. PIC17C devices specifically targeted the high-end 8-bit segment where complex control loops and faster interrupt latency were required versus the entry-level PIC16C family. Key features include 232 bytes of general-purpose RAM, 33 digital I/O pins, an external oscillator interface, an industrial operating temperature range of -40 °C to +85 °C, and supply voltage support of 4.5 V to 6.0 V. The OTP EPROM program memory eliminates the need for separate programming hardware and enables fast prototype-to-production transitions, while the 16 MHz clock input supports 121 ns minimum instruction cycles for deterministic real-time response. Technically, the PIC17C42A uses a RISC-style Harvard architecture with separate program and data buses, allowing simultaneous instruction fetch and operand access. Its 33 I/O pins are organized into ports that can be individually configured as digital inputs or outputs, and the device includes built-in EPROM programming support, brown-out reset, and a programmable counter array for capture/compare/PWM. Typical applications include industrial control systems, automotive electronics sub-modules, medical instrumentation, and consumer appliances. The compact 44-PLCC (J-lead) footprint is ideal for through-hole or socketed designs where field serviceability matters. The PIC17C42A is now considered a mature legacy device, suitable for maintenance of installed equipment rather than new high-volume designs. When designing with this part, ensure the EPROM programming window (on windowed variants) is covered with opaque label after programming to prevent UV-induced data loss, and verify the industrial temperature grade supports the target deployment environment. For new designs, evaluate the PIC18F family as a more modern drop-in successor with flash memory and lower power. This page synthesizes distributor availability, parametric comparisons, and engineering design notes not found in the manufacturer datasheet alone, supporting both new procurement decisions and legacy maintenance of installed PIC17C42A systems.

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PIC17C42AT-16I/PQ - 8-Bit 16MHz OTP MCU, 4KB | Microchip
PIC17C42AT-16I/PQ

PIC17C42AT-16I/PQ - 8-Bit 16MHz OTP MCU, 4KB | Microchip

The Microchip PIC17C42AT-16I/PQ is a high-performance 8-bit CMOS EPROM/ROM microcontroller from the PIC17C family, integrating 4KB (2K x 16) of OTP program memory and 232 bytes of RAM into a 44-pin MQFP (10x10 mm) surface-mount package. It runs at up to 16 MHz clock speed across an industrial-grade -40C to +85C temperature range and is offered in an 'I' (Industrial) temperature grade suffix. The device exposes 33 general-purpose digital I/O pins and includes a hardware USART for asynchronous and synchronous serial communication. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash/EPROM), working memory (RAM), and peripherals such as timers, I/O, and serial interfaces. The PIC17C family occupies the upper end of Microchip's classic 8-bit PIC line, bridging between the baseline PIC16 mid-range family and the higher-end PIC18 family. It uses a RISC-based Harvard architecture with separate program and data buses, which is the structural hypernym of all PIC microcontrollers, falling under the broader integrated circuit and semiconductor taxonomy. Key features of the PIC17C42AT-16I/PQ include a 16 MIPS instruction throughput at 16 MHz, 8-bit data width, hardware multiply support via the ALU, a multi-source interrupt controller, and a dedicated USART peripheral. The OTP program memory allows one-time field programming, making this part suitable for mature, low-cost production runs after prototype validation is complete on a windowed (JW) variant. Architecturally, the PIC17C42A employs a 16-bit instruction word with an 8-bit data path, which is why program memory is organized as 2K x 16. This wider instruction word gives the PIC17C family a richer addressing space (16-bit program counter) than its PIC16 predecessor while preserving code compatibility at the assembly level for many peripheral registers. Typical applications include industrial control systems, motor control front-ends, embedded instrumentation, automotive body electronics (non-safety-critical), HVAC controllers, and consumer appliance control boards. The 33 I/O count is well-matched to systems that need to drive multiple relays, keypads, and indicator panels. When designing with this part, ensure your firmware development is completed before ordering the OTP suffix because OTP memory cannot be erased and reprogrammed. For development cycles, use the PIC17C42A-16/JW (windowed CERDIP) variant that allows UV erasure and reuse of the same silicon. This page synthesizes distributor stock and pricing data, drop-in same-package alternatives, and engineering design notes that go beyond what the manufacturer datasheet provides alone.

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

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

The Microchip Technology PIC17C42AT-25/L is an 8-bit high-performance RISC microcontroller belonging to the PIC17C family, built around a 16-bit instruction word and 8-bit data path. It operates at a maximum clock speed of 25 MHz, integrates 4 KB of One-Time-Programmable (OTP) program memory organized as 2K x 16, and provides 232 bytes of data RAM. The device is offered in a 44-pin PLCC package (16.59 x 16.59 mm) with the designator suffix "/L" indicating the PLCC form factor, and the "T" indicating tape-and-reel packaging. An 8-bit microcontroller (MCU) is a single-chip computer that combines a CPU, non-volatile program memory, volatile data RAM, and peripheral interfaces on one silicon die. Within the broader taxonomy, the PIC17C42A is a high-performance 8-bit MCU -> CISC/RISC microcontroller -> microcontroller IC -> embedded processor. The 8-bit class is characterized by 8-bit-wide data paths, typically low pin counts, and instruction sets optimized for bit-manipulation and deterministic interrupt response, making these parts well suited to legacy industrial control and appliance applications. Key features of the PIC17C42AT-25/L include 33 digital I/O lines, an on-chip UART/USART for asynchronous serial communications, PWM outputs, a Power-On Reset (POR) block, and a Watchdog Timer (WDT) for code-flow monitoring. The internal architecture provides hardware multiply, multi-source interrupts, and a peripheral architecture that supports timer/counter modules, capture/compare, and serial I/O - features that were leading-edge for the early-1990s PIC17C generation. The supply voltage range is 4.5 V to 6.0 V. The PIC17C42A core uses a 16-bit Harvard architecture instruction bus paired with an 8-bit data bus, which improves code density compared with pure 8-bit CISC alternatives of the same era. The OTP EPROM cell allows the user to program the device once in-circuit, after which the bit pattern is permanent. ROM-programmed (ROMless windowed) variants are also available within the family. Typical applications include industrial motor control, HVAC fan and blower drivers, security panel keypads, white-goods user interfaces, automotive body controllers, and general-purpose embedded control where a deterministic real-time response is required. The 25 MHz CPU rate and integrated peripherals allow replacement of multiple discrete logic ICs with a single chip. When designing with this part, remember that the PIC17C42A is OTP only - firmware revisions require a new part. Engineers should plan for code-locked prototypes and keep a small stock of unprogrammed devices. PCB layout must observe Microchip's recommended decoupling (100 nF + 10 uF near VDD) and MCLR pull-up conventions. This page synthesizes distributor pricing, drop-in PIC17C42A-family alternatives, and practical design notes that are not collected in any single manufacturer datasheet.

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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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