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PIC17C42A-16E/L - 8-Bit 16MHz OTP MCU, 4KB, 44-PLCC | Microchip
PIC17C42A-16E/L

PIC17C42A-16E/L - 8-Bit 16MHz OTP MCU, 4KB, 44-PLCC | Microchip

The Microchip Technology PIC17C42A-16E/L is a high-performance 8-bit CMOS microcontroller from the PIC17C family, featuring 4KB of One-Time Programmable (OTP) program memory organized as 2K x 16 words, 232 x 8 bytes of RAM, and 33 digital I/O pins, all housed in a 44-pin PLCC (Plastic Leaded Chip Carrier) package measuring 16.59 x 16.59 mm. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, RAM, and peripherals on one die. Within the broader taxonomy, the PIC17C42A belongs to the OTP microcontroller category, which is a subset of embedded microcontrollers, themselves a class of microprocessors and, ultimately, semiconductors. The "17C" family designation historically marked Microchip's first high-end 8-bit architecture, positioned between the baseline PIC16C family and the later PIC18 family, and is now considered a mature legacy line. Key features include a maximum operating frequency of 16 MHz delivering up to 8.25 MIPS (121 ns instruction cycle), 4 KB of OTP program memory, 232 bytes of general-purpose RAM, 33 I/O pins, and an external oscillator interface. The OTP memory allows one-time field programming via a standard device programmer, making the part suitable for low-volume production runs and prototype-to-production transitions where mask ROM economics do not apply. Architecturally, the PIC17C42A implements a RISC-like Harvard instruction set with only 58 single-word instructions, a 16-bit instruction word, and a 8-bit data path. This wide-instruction/narrow-data topology favors deterministic execution and compact code density for state-machine and control-loop firmware, which is why the family found adoption in motor control, instrumentation, and industrial embedded systems in the 1990s. Typical applications include industrial control panels, sensor signal conditioning, motor drive sequencers, and legacy embedded systems originally designed around the PIC17C architecture. The 33 I/O pins and 16 MHz throughput are sufficient for keypad scanning, LED/LCD multiplexing, UART-based communication, and basic PID control loops. When designing with this device, note that OTP memory cannot be re-programmed in-circuit. Engineers should plan firmware revisions carefully, or use a socketed PLCC footprint to allow swap-out during development. Microchip recommends considering the PIC18F4220 as a newer Flash-based alternative for new designs. This page synthesizes distributor stock status, parametric alternatives, and lifecycle guidance not consolidated on the manufacturer product page, giving sourcing engineers a faster triage path for legacy PIC17C42A-16E/L designs.

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PIC17C42A-16E/P - 8-Bit OTP MCU, 4KB, 16MHz, 40-DIP | Microchip
PIC17C42A-16E/P

PIC17C42A-16E/P - 8-Bit OTP MCU, 4KB, 16MHz, 40-DIP | Microchip

The Microchip Technology PIC17C42A-16E/P is an 8-bit CMOS OTP-based microcontroller from the PIC17C family, delivering 8.25 MIPS (121 ns instruction execution) with 16 MHz clock speed in a 40-pin PDIP package. It integrates 4 KB (2K x 16) of program memory and 232 bytes of RAM, with 33 programmable digital I/O lines for peripheral expansion. An 8-bit microcontroller is a single-chip computer that combines a CPU, program memory, data memory, and peripherals on one die; the PIC17C family is Microchip's high-performance branch of the 8-bit portfolio, sitting above the PIC16C/PIC12C lines and below the PIC18C. OTP (One-Time Programmable) means the program memory can be written once and is non-volatile thereafter - ideal for low-cost production runs where firmware is finalized at assembly. Key features include 16 MHz maximum clock speed, 4 KB program memory, 232-byte RAM, hardware multiply, 8-level hardware stack, 33 I/O pins, and integrated peripherals: a USART, two PWM modules, a watchdog timer, and power-on reset. The device operates from 4.5 V to 6.0 V across the -40 C to +125 C extended temperature range, fitting industrial and consumer embedded roles. Architecture-wise, PIC17C42A uses a Harvard RISC core with a 16-bit instruction word and 8-bit data path. The 33 I/O pins share ports RB, RC, and RD; pinout compatibility with PIC16C5X/PIC12CXXX/PIC16CXX lets designers migrate firmware upward while keeping the existing PCB layout. Applications include industrial control, automotive subsystems, consumer electronics, and embedded control where 8-bit simplicity and OTP cost advantages matter. The PIC17C42A is a mature part; Microchip recommends PIC18F4220 for new designs. Drop-in alternatives exist within the same family (PIC17C42A-16/P, PIC17C42A-16E/L, PIC17C42A-16E/PQ) to cover packaging, speed, and temperature variants. When designing in this MCU, account for OTP (no firmware updates in-field), confirm supply is within 4.5-6.0 V, and reserve the MCLR pin for proper reset. This page consolidates distributor pricing, verified drop-in alternatives, and practical engineering notes not aggregated on any single manufacturer page.

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PIC17C42A-16E/PQ - 16MHz 8-bit OTP MCU, 44-MQFP | Microchip
PIC17C42A-16E/PQ

PIC17C42A-16E/PQ - 16MHz 8-bit OTP MCU, 44-MQFP | Microchip

The Microchip Technology PIC17C42A-16E/PQ is a high-performance 8-bit CMOS OTP microcontroller from the PIC17C family, delivering 8.25 MIPS (121 ns instruction execution) through a 16 MHz external oscillator in a 44-pin MQFP (10x10) surface-mount package. It integrates 4KB (2K x 16) of One-Time-Programmable (OTP) program memory, 232 bytes of RAM, and 33 digital I/O pins, providing a powerful yet easy-to-program platform with only 58 single-word instructions. The 'E' suffix indicates an industrial-grade operating temperature range, while the PIC17C42A is one of Microchip's first PIC17-family parts offering 16-bit program word width and a Harvard architecture optimized for compute-intensive embedded control. A microcontroller is a single-chip computer that integrates a CPU, RAM, non-volatile program memory (ROM/Flash/OTP), and peripheral I/O into one package. Within the broader taxonomy of semiconductor devices, microcontrollers sit under microprocessors (which lack on-chip memory and peripherals) and above generic logic ICs in integration level. PIC microcontrollers (Peripheral Interface Controllers) use a modified Harvard architecture with separate program and data buses, enabling single-cycle instruction fetch and deterministic interrupt response favored in real-time control. The PIC17C42A, as a member of the discontinued PIC17C family, sits between the legacy PIC16C and the modern PIC18 in capability and is supported by Microchip's MPLAB IDE toolchain via legacy device support packages. Key features of the PIC17C42A-16E/PQ include four 8-bit I/O ports (PORTA-PORTD with 33 lines total), a 16-bit timer/counter (TMR0) with 8-bit prescaler, an 11-channel 8-bit ADC, two analog comparators, a Universal Synchronous/Asynchronous Receiver-Transmitter (USART), and a watchdog timer with on-chip RC oscillator for reliable operation. The device supports external, crystal, or RC oscillator modes, and provides a programmable code-protection bit to lock OTP contents against unauthorized read-back, valuable for embedded intellectual-property protection. Architecturally, the PIC17C42A uses an enhanced Harvard bus with a 16-bit instruction word and 8-bit data path, an 8-level deep hardware stack, and direct register-mapped I/O for deterministic cycle timing. The 16 MHz clock yields 121 ns instruction cycle and 8.25 MIPS throughput, with most instructions executing in a single cycle except for branches (2 cycles). The OTP EPROM cell supports in-circuit programming via the ICSP interface using RB6 (clock) and RB7 (data) pins, enabling field firmware updates on a one-time basis. Typical applications include industrial automation controllers, automotive body and accessory modules, motor control subsystems, and consumer-electronics appliances where deterministic real-time response is critical. The PIC17C42A is also used in legacy medical instrumentation, security alarm panels, and high-end remote-control products that were originally designed in the late 1990s and require form-fit-function replacement parts. Note that Microchip's product page recommends migrating to the PIC18F4220 for new designs, as the PIC17C42A is on a last-time-buy/EOL track. When designing with this part, ensure your supply rail stays within the 4.5V-6V range and that decoupling capacitors (0.1 uF ceramic) are placed adjacent to VDD/VSS pairs. The /MCLR reset pin must be pulled high through a 10k resistor and a 100 nF cap to ground for proper power-on-reset behavior. The 44-MQFP package has a 0.8 mm lead pitch, requiring precise reflow profile and aperture design for reliable production soldering. This page synthesizes distributor pricing, drop-in alternatives (PIC17C42A-16I/PQ, PIC17C42A-16/PQ, etc.), lifecycle status (last-time-buy), and practical design notes not found in the manufacturer datasheet.

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PIC17C42A-16I/L - 8-bit 16MHz OTP MCU, 4KB | Microchip
PIC17C42A-16I/L

PIC17C42A-16I/L - 8-bit 16MHz OTP MCU, 4KB | Microchip

The Microchip PIC17C42A-16I/L is a high-performance 8-bit CMOS OTP-based RISC microcontroller delivering 8.25 MIPS (121 ns instruction cycle) from a 33 MHz oscillator input, packaged in a 44-pin PLCC (J-lead, "L" suffix). It integrates 4 KB (2K × 16) of OTP program memory, 232 × 8 bytes of RAM, and 33 digital I/O pins, providing substantially more horsepower and I/O than baseline PIC16C5X/PIC12CXXX devices while remaining upward code-compatible. What is a microcontroller (MCU)? An MCU is a single-chip computer that integrates a CPU core, non-volatile program memory (ROM/EPROM/Flash/OTP), working RAM, and peripheral interfaces (GPIO, timers, UART, ADC, etc.) into one package. PIC17C4X parts sit in Microchip's "high-performance 8-bit" tier, between the mid-range PIC16 family and the 16-bit dsPIC/PIC24 families, and are part of the broader power-management-and-embedded-control semiconductor category. Key features include a RISC instruction set with only 58 single-word instructions (all single-cycle, 121 ns, except program branches and table reads/writes which are two-cycle), a 16-level hardware stack, a hardware multiply unit, two 8-bit timer/counters, and one 16-bit timer/counter with capture/compare. The 16I industrial-grade temperature range (-40 °C to +85 °C) and OTP program memory make it well suited for low-volume production runs and field-proven designs. The PIC17C42A uses a Harvard-architecture CPU with separate program and data buses, an 8-bit ALU with a hardware multiply (8 × 8 in one cycle), and a 16-bit-wide program word. The 121 ns instruction execution at 33 MHz oscillator allows deterministic interrupt response and tight control loops, distinguishing it from CISC 8-bit MCUs of the same vintage. Typical applications include industrial control subsystems, motor-control front-ends, instrumentation, smart sensors, automotive body/comfort ECUs (non-safety), and legacy embedded products ported from PIC16 designs that require more code space, more RAM, or more I/O. The 4 KB OTP and 232 B RAM are sized for moderate protocol stacks and state machines. When designing with this part, account for OTP (one-time-programmable) limitations: firmware must be fully verified before programming. Also note Microchip's recommendation that newer designs use the PIC18F4220 as the modern functional successor. The PLCC-44 socket footprint allows in-system programming with standard tools. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC17C42A-16I/P - 8-Bit 16MHz OTP MCU, 40-PDIP | Microchip
PIC17C42A-16I/P

PIC17C42A-16I/P - 8-Bit 16MHz OTP MCU, 40-PDIP | Microchip

The Microchip Technology PIC17C42A-16I/P is a high-performance 8-bit CMOS EPROM/ROM microcontroller running at 16 MHz instruction rate with 4 KB (2K x 16) of OTP program memory, 232 bytes of RAM, and 33 digital I/O pins, housed in a 40-pin PDIP through-hole package. Background: An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, RAM, peripherals, and I/O. PIC17C series microcontrollers use a RISC-based Harvard architecture with 58 single-word instructions, most executing in a single instruction cycle (121 ns at 16 MHz oscillator input). The 17C family sits above the baseline PIC16 in Microchip's portfolio, adding hardware multipliers, additional timers, USART, PWM, and capture modules for real-time control applications. Key features of the PIC17C42A-16I/P include 8.25 MIPS throughput, an external oscillator interface, three hardware timers, two capture inputs, two PWM outputs, a hardware USART, an 8x8 hardware multiplier, and a 16-level hardware stack. The OTP (One-Time-Programmable) memory enables pre-programmed code for prototyping and low-to-medium volume production runs. The 'I' suffix denotes industrial temperature grade (-40C to +85C). Architecturally, the PIC17C42A uses a 16-bit-wide instruction word with an 8-bit data path, providing 2K instruction words and 232 bytes of register-mapped RAM. Compared to PIC16C devices, the 17C core widens the program bus, adds indexed addressing with two address pointers, and integrates a hardware multiply unit. Typical applications include industrial control loops, motor drives, smart sensors, automotive subsystems, security panels, and embedded data-acquisition front-ends that need deterministic timing and a small footprint. Design consideration: When replacing or sourcing this part, note that Microchip has marked the PIC17C42A as legacy. For new designs, Microchip recommends the PIC18F family as a modern flash-based migration path. Designers should verify oscillator input drive strength and use a 100 nF decoupling capacitor on VDD placed within 5 mm of the package pins. This page synthesizes distributor pricing, drop-in PDIP alternatives within the PIC17C family, and practical design notes not found in the manufacturer datasheet alone.

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PIC17C42A-16I/PQ - 8-bit 16MHz OTP MCU 4KB | Microchip 44-MQFP
PIC17C42A-16I/PQ

PIC17C42A-16I/PQ - 8-bit 16MHz OTP MCU 4KB | Microchip 44-MQFP

The Microchip Technology PIC17C42A-16I/PQ is a high-performance 8-bit CMOS EPROM/ROM-based microcontroller from the PIC17C family, delivering 8.25 MIPS with a 121 ns single-cycle instruction execution time. The device integrates 4 KB of One-Time-Programmable (OTP) program memory organized as 2K x 16 words, 232 bytes of general-purpose RAM, and 33 digital I/O pins, all housed in a 44-pin Metric QFP (MQFP-44, 10x10 mm) package. It operates from a 16 MHz external clock input and is specified over the industrial -40C to +85C temperature range. What is an 8-bit OTP microcontroller? An 8-bit microcontroller (MCU) is a small computer-on-a-chip built around an 8-bit data path and RISC-style instruction set. OTP (One-Time-Programmable) memory allows the firmware to be written once and retained, which is widely used in cost-sensitive, high-volume embedded products. The PIC17C family sits above the baseline PIC16C5X/PIC12CXXX line in Microchip's taxonomy: 8-bit MCU -> CMOS MCU -> RISC MCU -> microcontroller -> embedded computing. The PIC17C42A adds multi-cycle hardware multiply support, an expanded instruction set, and a wider interrupt model compared with PIC16C devices. Key features include 58 single-word instructions, hardware multiplier, two-cycle program branches and table read/write operations, an external oscillator interface, brown-out and power-on reset, and a versatile 8-level hardware stack. The PIC17C42A architecture retains upward code compatibility with PIC16C5X, PIC12CXXX and PIC16CXX devices, simplifying migration from earlier 8-bit designs. Typical applications include industrial control, motor drive front-ends, automotive body modules, instrumentation, security and access control, and consumer white goods. The wide I/O count (33 pins) and external oscillator flexibility make it well-suited to legacy designs where long-term firmware stability and CMOS low power are required. A critical design note: Microchip's product page recommends migrating to PIC18F4220 for new designs because the PIC17C42A is in declining production. Engineers maintaining existing product lines should plan for the eventual obsolescence of the OTP PIC17C family.

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PIC17C42A-25/P - 8-Bit 25MHz OTP MCU 4KB | Microchip
PIC17C42A-25/P

PIC17C42A-25/P - 8-Bit 25MHz OTP MCU 4KB | Microchip

The Microchip Technology PIC17C42A-25/P is a high-performance 8-bit CMOS EPROM/ROM microcontroller delivering 8.25 MIPS throughput (121 ns instruction cycle) at a 25 MHz maximum clock, packaged in a 40-pin PDIP through-hole format. It integrates 4 KB of One-Time-Programmable (OTP) program memory (organized as 2K x 16 wide words), 232 bytes of general-purpose RAM, and 33 digital I/O pins, giving designers a compact 8-bit core with substantial peripheral integration for legacy embedded designs. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data-path CPU, on-chip program memory, RAM, and a rich set of peripherals such as timers, capture/compare/PWM, USART, and I/O ports. Within the broader taxonomy, the PIC17C42A belongs to the PIC architecture family > OTP-based 8-bit MCU > microcontroller > embedded processor > semiconductor. OTP EPROM program memory lets engineers program the part once, including late-stage firmware revisions, without needing a windowed or flash part; the trade-off is no field re-programmability. Key features include a 16-level hardware stack, 16-bit instruction word, 58 single-word instructions, multiply and divide hardware support, dual 8-bit timers plus 2 capture inputs, 2 PWM outputs, a USART for serial communication, and external memory addressing for code beyond 64 KB. The 25 MHz oscillator drives a 4-cycle instruction execution pipeline, giving deterministic interrupt and timing behavior that is well-suited to real-time control loops. Typical applications include industrial automation controllers, motor control and appliance front panels, HVAC and building-control subsystems, automotive body/comfort modules, legacy communication protocol bridges, and instrumentation requiring deterministic 8-bit behavior. Designers familiar with PIC16C5X and PIC12CXXX devices retain tool and instruction-set continuity, easing code portability from earlier 8-bit designs. When designing with this device, mind the OTP memory constraint, validate the 5V to 6V supply window on every revision, and budget adequate decoupling near VDD/VSS pins. For modern designs that require field updates, consider the PIC18F4220 migration path Microchip recommends; for new builds where re-programmability matters, prefer flash-based PIC18 from the outset. This page synthesizes distributor pricing, parametric drop-in alternatives, and practical thermal and decoupling design notes that go beyond the manufacturer datasheet baseline, helping procurement and engineering teams decide whether PIC17C42A-25/P fits their legacy or production design.

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PIC17C42A-25/PQ - 25MHz 8-bit OTP MCU, 4KB, 44-MQFP | Microchip
PIC17C42A-25/PQ

PIC17C42A-25/PQ - 25MHz 8-bit OTP MCU, 4KB, 44-MQFP | Microchip

The Microchip Technology PIC17C42A-25/PQ is an 8-bit, 25MHz, OTP-programmable CMOS microcontroller in the PIC17C family, packaged in a 44-pin MQFP (10x10mm). It integrates 4KB (2K x 16) of OTP program memory, 232 bytes of RAM, and 33 digital I/O lines, and executes instructions at 8.25 MIPS (121 ns per instruction). The /PQ suffix denotes the 44-MQFP plastic gull-wing package suitable for surface-mount assembly. 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 above the PIC16C/PIC12C in Microchip's 8-bit hierarchy and is upward-compatible with PIC16C5X, PIC12CXXX, and PIC16CXX devices. PIC17C42A extends the original PIC17C42 with architectural enhancements, providing 58 single-word instructions and a powerful RISC core aimed at high-throughput embedded control. Key specifications include a 25 MHz maximum operating frequency, 8-bit data width with 16-bit instruction word, 4KB OTP program memory, 232 bytes data RAM, 33 I/O pins, and commercial operating temperature grade. The device uses a Harvard architecture with separate code and data buses, plus dedicated peripherals including timers, capture/compare/PWM modules, USART, and an 8-channel 10-bit (typical) A/D converter — making it suitable for mixed analog/digital control tasks. Architecturally, PIC17C42A employs an enhanced 8-bit RISC pipeline with 16-bit instruction words and an 8-level deep hardware stack for fast context switching. The OTP program memory allows factory or production-line programming of a fixed code image, which is typical for cost-optimized mass production where firmware is stable. Brown-out reset, watchdog timer, power-on reset, and interrupt controller are integrated for robust embedded operation. Typical applications include industrial control panels, motor control, instrumentation, HVAC controllers, security and alarm systems, and embedded sensor interfaces. The wide peripheral set also suits small-form factor human-machine interface (HMI) boards. The -25 speed grade supports time-critical control loops requiring deterministic 121 ns instruction execution. When designing with this OTP device, remember that program memory is one-time programmable — firmware bugs cannot be patched in the field. Use a flash-based equivalent such as PIC18F4220 for prototypes, then port final code to the OTP PIC17C42A-25/PQ for production. Ensure in-circuit emulation or socket programming for development to avoid scrapping parts. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the standalone manufacturer datasheet, helping engineers make a faster sourcing decision for legacy and maintenance designs.

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PIC17C42A-25/PT - 8-bit OTP MCU, 4KB, 33 I/O, 25MHz TQFP-44
PIC17C42A-25/PT

PIC17C42A-25/PT - 8-bit OTP MCU, 4KB, 33 I/O, 25MHz TQFP-44

The Microchip PIC17C42A-25/PT is an 8-bit high-performance CMOS EPROM/ROM-based microcontroller executing 58 single-word instructions at up to 8.25 MIPS (121 ns instruction cycle) and packaged in a 44-pin TQFP (PT) surface-mount form factor. Key headline parameters include 4KB (2K x 16) of OTP program memory, 232 x 8 bytes of RAM, 33 digital I/O pins, and a 25 MHz maximum external clock input. The /PT suffix denotes TQFP-44 tray packaging. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory (ROM/Flash/EPROM), data memory (RAM), and configurable peripherals. Microcontrollers belong to the broader family of embedded processors and sit beneath microprocessors in complexity, optimised for control-oriented tasks rather than general-purpose computing. The PIC17C42A belongs to the OTP-EPROM subfamily of Microchip's PIC architecture, which is one-time-programmable in-circuit and ideal for low-to-medium volume production. Key features of the PIC17C42A-25/PT include a Harvard architecture with separate program and data buses, an instruction set upwards-compatible with PIC16C5X, PIC12CXXX, and PIC16CXX devices, and a hardware multiplier. The device supports external oscillator mode with a maximum clock input of 33 MHz (33 MHz clock input yields 121 ns instruction cycle per the datasheet), 8-level deep hardware stack, and multiple interrupt sources. Operating voltage range is 3.0 V to 6.0 V. Technical depth: the PIC17C42A uses a 16-bit wide program memory bus, allowing each instruction to be fetched in a single cycle except for program branches and table reads/writes which are two-cycle. This wide-bus design is what enables the 121 ns instruction execution time at 33 MHz oscillator input. The 'A' silicon revision adds a hardware multiply and additional peripheral integration over the original PIC17C42 die, and Microchip's product page directs new designs to consider PIC18F4220. Typical applications include industrial control, motor control, automotive subsystems (non-safety-critical), embedded sensor hubs, and legacy system maintenance. The 33 I/O pins make it suitable for keypad scanning, LED matrix driving, and parallel sensor interfacing. Wide operating voltage supports both 3.3 V and 5 V rails. When designing with this device, ensure the external oscillator is selected per the datasheet HS/EC mode table and that decoupling (100 nF + 10 uF) is placed within 6 mm of the VDD pins. Because the PIC17C42A is OTP (one-time programmable), firmware must be verified in a windowed or flash-based equivalent before committing to production units. This page synthesises distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a one-stop procurement and engineering reference for the PIC17C42A-25/PT.

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PIC17C42A-25E/L - 8-Bit 25MHz OTP MCU 4KB PLCC | Microchip
PIC17C42A-25E/L

PIC17C42A-25E/L - 8-Bit 25MHz OTP MCU 4KB PLCC | Microchip

The Microchip Technology PIC17C42A-25E/L is an 8-bit CMOS OTP (One-Time Programmable) microcontroller from the PIC17C family, operating at 25 MHz and delivering 8.25 MIPS (121 ns instruction execution) in a 44-pin PLCC (J-Lead) package. It integrates 4 KB of program memory (2K x 16 organization) and 232 x 8 bytes of RAM, with 33 digital I/O pins and an external oscillator interface. An 8-bit microcontroller is a small, self-contained computing element built around an 8-bit data bus and Harvard architecture. The PIC17C42A family sits between baseline PIC16C5X and enhanced PIC16CXX devices in the Microchip PIC hierarchy: PIC16C5X (12-bit instructions, OTP/ROM) -> PIC17C42A (16-bit instructions, OTP, 8.25 MIPS) -> PIC18F (16-bit instructions, Flash, >10 MIPS). It uses a RISC core with only 58 single-word instructions, yet offers significantly more horsepower than earlier PIC16 devices, making it suitable for applications that need real-time response without moving to the PIC18 platform. Key features include a 25 MHz external clock, an 8-level hardware stack, multiple interrupt sources, two 8-bit timer/counters, a 16-bit timer/counter, a synchronous serial port (SSP) supporting SPI/I2C master modes, an 8-bit parallel slave port, and a USART. The device is built on a low-power CMOS process and operates from 4.5 V to 5.5 V. Compared with later PIC18F devices, PIC17C42A offers a wider supply tolerance and a robust 8-bit ALU optimized for byte-oriented control. Typical applications include industrial control logic, motor control, automotive body electronics, point-of-sale terminals, security panels, and embedded instrumentation. Per Microchip, the recommended migration path is PIC18F4220 - new designs should generally not start on PIC17C42A. When designing with PIC17C42A-25E/L, note that it is OTP, not Flash - firmware cannot be re-programmed in-circuit. Use the 'E' windowed (UV-erasable) or emulator variants for prototyping. The 44-PLCC footprint is common with PIC17C43/44 devices, allowing pin-compatible upgrades within the family.

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PIC17C42A-25E/P - 8.25 MIPS 8-bit OTP MCU, 4KB, 25MHz, 40-DIP | Microchip
PIC17C42A-25E/P

PIC17C42A-25E/P - 8.25 MIPS 8-bit OTP MCU, 4KB, 25MHz, 40-DIP | Microchip

The Microchip Technology PIC17C42A-25E/P is an 8.25 MIPS (121 ns instruction execution) 8-bit CMOS OTP-based microcontroller delivering up to 25 MHz core clock speed, 4 KB (2K x 16) of one-time-programmable program memory, 232 x 8 bytes of RAM, and 33 digital I/O lines, packaged in a 40-pin PDIP (P) through-hole format. The -25E speed grade runs the CPU at 25 MHz from a 4.5V to 5.5V supply and is rated for the -40C to +125C extended industrial temperature range, making it suitable for harsh-environment embedded designs. An 8-bit OTP microcontroller (One-Time-Programmable MCU) is a class of microcontrollers whose on-chip program memory can be written exactly once and then behaves like masked ROM. The PIC17C42A belongs to Microchip's PIC17C family, which sits at the top of the original 8-bit PIC hierarchy (PIC12CXXX < PIC16C5X/PIC16CXX < PIC17C4X) and is upwards compatible with the PIC16C5X, PIC12CXXX and PIC16CXX instruction sets, extending them with a hardware multiplier, additional interrupt sources, and a wider 16-bit instruction path. Key features include a RISC architecture with only 58 single-word instructions, an 8-bit data path with a 16-bit instruction word for compact code density, a hardware 8-bit x 8-bit multiplier, an external oscillator interface, and brown-out / watchdog / power-on reset peripherals typical of the family. The 17C-series instruction set adds multiply, table-read, table-write, and 16-bit MOV/MOVFP/MOVPF operations not present in earlier PIC16 cores, allowing faster arithmetic and pointer-heavy code. The PIC17C42A is implemented in CMOS technology with on-chip EPROM-based program storage. Because it is OTP rather than flash, the device is targeted at production volume code that does not require field updates, and is frequently used as a cost-down replacement for older masked-ROM MCUs. The PIC17C4X family shares peripheral architecture with later PIC18F devices, making PIC18F migration a well-documented path. Typical applications include industrial control, motor control, automotive body and chassis ECUs, sensor interfacing, and consumer appliance control. The 33 I/O pins and 232-byte RAM suit designs that need more I/O than PIC16 mid-range parts can offer while keeping the simplicity of an 8-bit core. When designing with this device, remember that OTP memory cannot be erased; engineers typically validate firmware on a flash-based PIC18F or PIC17C development part and then move the final code image to the PIC17C42A for production. Always provide adequate decoupling on VDD and place the external oscillator close to the OSC1/OSC2 pins to meet the 25 MHz timing budget. This page synthesizes distributor stock, drop-in alternatives in the same 40-pin PDIP footprint, and engineering design notes beyond the manufacturer datasheet.

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PIC17C42A-25E/PQ - 8-Bit OTP MCU, 25MHz, 4KB | Microchip
PIC17C42A-25E/PQ

PIC17C42A-25E/PQ - 8-Bit OTP MCU, 25MHz, 4KB | Microchip

The Microchip Technology PIC17C42A-25E/PQ is a high-performance 8-bit CMOS EPROM/ROM microcontroller built on the PIC17C family architecture, delivering 8.25 MIPS (approximately 25 MHz core clock / 121 ns instruction cycle) in a 44-pin Metric QFP (MQFP) package. The device integrates 4 KB (2K x 16) of One-Time Programmable (OTP) program memory, 454 bytes of general-purpose SRAM, and 33 bytes of dedicated register RAM, packaged as a 44-MQFP (10x10 mm). An OTP microcontroller is a non-volatile programmable device whose program memory can be written exactly once by the user (versus flash, which supports multiple erase/write cycles). The 'E' suffix designates the Extended industrial temperature grade of -40C to +125C, while the 25 speed bin specifies a 25 MHz maximum oscillator frequency. Within the broader PIC taxonomy, the PIC17C42A sits at the upper end of the 8-bit family, providing PIC17 architectural enhancements over earlier PIC17C42 silicon and full code compatibility with PIC16C5X, PIC12CXXX and PIC16CXX devices for code portability. Key features of the PIC17C42A-25E/PQ include a RISC Harvard-architecture core with 58 single-word instructions, two 8-bit and two 16-bit timers, a single USART for asynchronous/synchronous serial, a watchdog timer with dedicated on-chip RC oscillator, and 33 digital I/O lines. Interrupt logic supports both vectored and non-vectored sources, and the device operates from a 5 V nominal supply (typical operating range 4.0 V to 6.0 V per the datasheet family). Architecturally, the PIC17C42A separates program and data buses (Harvard) and uses a two-stage instruction pipeline, enabling most instructions to execute in a single 121 ns cycle. The high-throughput core, combined with on-chip peripherals, makes the device well-suited to control applications that require deterministic timing such as motor control, instrumentation, and industrial automation. EPROM windowed and ROM-masked variants exist for development and high-volume production respectively. Typical applications include embedded industrial controllers, automotive body/comfort subsystems, appliance control boards, security and alarm panels, and instrumentation front-ends that benefit from the deterministic interrupt latency and large instruction throughput. The MQFP-44 footprint remains popular for through-hole-free surface-mount designs and is widely supported by third-party prototyping tools. When designing with this device, allocate sufficient PCB area for the 10x10 mm MQFP package and observe Microchip's decoupling guidance (typically 0.1 uF plus bulk capacitance near the supply pins). Engineers maintaining legacy designs should review Microchip's PIC18F migrator guidance, since the PIC17C42A has been superseded for new designs.

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PIC17C42A-25I/L - 8-Bit 25MHz OTP MCU, 4KB 44-PLCC | Microchip
PIC17C42A-25I/L

PIC17C42A-25I/L - 8-Bit 25MHz OTP MCU, 4KB 44-PLCC | Microchip

The Microchip Technology PIC17C42A-25I/L is a high-performance 8-bit CMOS EPROM/ROM-based microcontroller built on the PIC17C architecture, delivering up to 25 MHz operation (8.25 MIPS / 121 ns instruction execution) in a 44-pin PLCC package. It integrates 4KB (2K x 16) of One-Time-Programmable (OTP) program memory and 232 bytes of RAM, with 33 digital I/O lines. The '25I' suffix denotes the 25 MHz speed grade and industrial temperature range (-40C to +85C), and the '/L' suffix designates the 44-lead PLCC (J-Lead) package. A microcontroller (MCU) is a single-chip computer containing a CPU core, program and data memory, peripherals, and I/O. The PIC17C family was Microchip's first 8-bit architecture to exceed the 4 MHz limit of the legacy PIC16C5X line, adding a hardware multiplier, expanded instruction set (58 single-word instructions), and an upgraded interrupt controller. Within Microchip's broader taxonomy, the PIC17C42A sits between PIC16C mid-range parts and PIC18 enhanced devices, and is upwards-compatible with the PIC16C5X, PIC12CXXX, and PIC16CXX instruction sets. Key features include 4KB OTP program memory, 232 bytes of general-purpose RAM, 33 I/O pins, an 8-bit timer/counter, an analog comparator, a watchdog timer, and a 25 MHz external oscillator interface. Industrial temperature range and CMOS low-power design make the part well-suited to embedded control applications requiring deterministic execution. The PIC17C42A uses a 14-bit instruction word stored in OTP EPROM. The architecture separates program and data buses (Harvard) and provides a 16-level hardware stack, two hardware interrupts, and up to 8 software interrupts, enabling responsive real-time control. The ALU performs single-cycle arithmetic and logical operations; a hardware 8x8 multiplier accelerates math. Typical applications include industrial control, motor drive interfacing, sensor conditioning front-ends, smart instrumentation, white-goods control boards, and embedded legacy systems where PIC16C5X upward compatibility is required. Microchip recommends migrating to the PIC18F4220 for new designs, as the PIC17C42A has been replaced by modern flash-based PIC18 parts. When designing with this device, note that OTP memory is one-time programmable; firmware bugs cannot be patched without replacing the silicon. A crystal or resonator up to 25 MHz must be supplied externally, and decoupling capacitors must be placed close to VDD/VSS pins for reliable operation. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not consolidated in the manufacturer datasheet, helping engineers evaluate supply-chain options for this mature PIC17C part.

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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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