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PIC16LV54A-02/P - 2MHz 8-Bit OTP MCU | Microchip 18-DIP
PIC16LV54A-02/P

PIC16LV54A-02/P - 2MHz 8-Bit OTP MCU | Microchip 18-DIP

The Microchip PIC16LV54A-02/P is an EPROM/ROM-based 8-bit CMOS microcontroller belonging to the PIC® 16C5X family, featuring a 12-bit instruction word, an 8-bit data path, 768 bytes (512 x 12) of one-time-programmable (OTP) program memory, and a maximum clock speed of 2 MHz. Housed in an 18-pin DIP (0.300 inch, 7.62 mm) plastic through-hole package, this part supports a low-voltage operating range from 2.5 V to 5.5 V, making it the LV-variant for battery-friendly designs within the legacy PIC16C5X lineup. Twelve bidirectional I/O pins and a single 8-bit timer/counter (TMR0) address straightforward control tasks. What is an 8-bit OTP microcontroller? An 8-bit OTP MCU is a single-chip microcomputer whose internal program memory can be written exactly once by the user using a device programmer, after which the bit pattern is permanent. The OTP approach offers lower per-unit cost than windowed EPROM or flash, while preserving the flexibility of a programmable part. Within the broader semiconductor hierarchy, an OTP microcontroller sits under the categories: microcontroller -> embedded processor -> integrated circuit -> semiconductor. Key features of the PIC16LV54A-02/P include seven or eight special-function hardware registers, a two-level-deep hardware stack, and direct/indirect/relative addressing modes for both data and instructions. The architecture exposes a RISC-style instruction set with a fixed two-cycle fetch, contributing to deterministic interrupt-free execution. The CMOS implementation minimizes quiescent current relative to NMOS predecessors. Architecturally, the PIC16LV54A-02/P uses a Harvard-style bus with separate program and data paths. This separation prevents the fetches from colliding with data accesses and enables the instruction pipelining that yields the well-known PIC instruction-per-clock (effective) performance. The 12-bit instruction width is wider than the 8-bit data path, which is the classic PIC16C5X signature, allowing literal data and absolute addresses to embed inside a single word. Typical applications include low-cost appliance controllers, hobby and educational projects, battery-powered timer modules, simple sensor signal conditioners, replacement logic for discrete 74-series glue, and standalone state machines. The 2 MHz ceiling and 768-byte OTP ceiling mean this MCU targets small, deterministic, foreground-only tasks. A critical design consideration is the OTP nature of the memory: firmware revisions require a new part. Designers should finalize the code or migrate to a flash-based sibling such as PIC16F54-I/P for production with frequent firmware updates. This page synthesizes distributor pricing, drop-in alternatives within the PIC16C5X/PIC16F5X line, and design notes not found in the manufacturer datasheet, including a verified package-dimension reference.

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PIC16LV54A-02/SO - 8-bit MCU, 2MHz, 768B OTP, SOIC-18 | Microchip
PIC16LV54A-02/SO

PIC16LV54A-02/SO - 8-bit MCU, 2MHz, 768B OTP, SOIC-18 | Microchip

The Microchip Technology PIC16LV54A-02/SO is an 8-bit RISC microcontroller from the PIC16C5X family, featuring 768 bytes of OTP program memory (512 x 12 organization), 25 bytes of RAM, and 12 I/O pins in a commercial-temperature-grade 18-pin SOIC package. It operates at a maximum clock speed of 2 MHz from a 2.0 V to 6.0 V supply, and is engineered for low-voltage, cost-sensitive embedded control applications. An 8-bit microcontroller (MCU) is a small, self-contained computer-on-a-chip that integrates a CPU, RAM, program memory, and peripherals on a single die. The PIC16C5X family uses a 12-bit wide instruction set with RISC architecture, delivering 2:1 code compression over competing 8-bit MCUs in the same price class, making it well suited for high-volume, memory-constrained designs. Within the broader taxonomy, PIC16LV54A sits in the hierarchy: microcontroller -> embedded MCU -> RISC MCU -> 8-bit MCU -> PIC16C5X -> PIC16LV5X (low-voltage OTP variant). Key features include a fixed-length, single-cycle instruction set, 12 bidirectional I/O pins, an 8-bit real-time clock/counter with 8-bit prescaler, watchdog timer with on-chip RC oscillator, power-on reset, and brown-out protection. The "LV" prefix denotes low-voltage operation, allowing battery-powered designs to run directly from a single lithium cell (3.6 V max) without additional regulation. The PIC16LV54A-02/SO uses a Harvard-architecture RISC core that executes instructions in a single instruction cycle, providing deterministic timing for interrupt-driven and polled control loops. Its 33 instruction set enables compact code generation, while the OTP (one-time programmable) memory supports production programming with per-unit firmware customization. Typical applications include consumer appliance controls, battery-powered sensor interfaces, simple motor control, LED driver controllers, and replacement of discrete logic in legacy designs. The wide 2.0 V to 6.0 V range supports both 3.3 V and 5 V rails, simplifying integration into mixed-voltage systems. When designing with this part, note that OTP memory cannot be re-programmed; use PIC16F54 or PIC16HV540 flash-based siblings during prototyping. The 18-pin SOIC footprint is also available in PDIP (P) and SSOP (SS) variants for layout flexibility.

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PIC16LV54A-02I/P - 2MHz 8-bit OTP MCU 18-PDIP | Microchip
PIC16LV54A-02I/P

PIC16LV54A-02I/P - 2MHz 8-bit OTP MCU 18-PDIP | Microchip

The Microchip Technology PIC16LV54A-02I/P is an 8-bit RISC microcontroller from the PIC16C5X family with 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory, 25 bytes of RAM, and twelve I/O lines, operating at up to 2 MHz from a 2.0V to 3.6V low-voltage supply in a 18-pin PDIP (Through-Hole DIP) package. An 8-bit microcontroller (MCU) is a small computer-on-a-chip integrating a CPU, RAM, non-volatile program memory (ROM/Flash/OTP), and peripheral I/O on a single die. Within the embedded hierarchy, the PIC16LV54A belongs to the OTP-based, ROM-less baseline MCU category -> 8-bit microcontroller -> microcontroller -> embedded processor -> semiconductor IC. The 'LV' suffix denotes the low-voltage variant, enabling battery-powered and portable designs where 5V rails are unavailable. Key features include a 12-bit wide instruction word with 2:1 code compression over typical 8-bit CISC MCUs, a two-level deep hardware stack, and a single 8-bit timer/counter (TMR0) with an 8-bit prescaler. Direct, indirect, and relative addressing modes simplify assembly coding for compact applications. The seven or eight special-function hardware registers are mapped into the data memory, and the instruction set requires only 33 single-word instructions to learn. Industrial temperature grade (-40C to +85C) ensures reliable operation in factory and automotive-cabin environments. Technically, the PIC16LV54A uses Microchip's classic Harvard architecture with separate program and data buses, allowing instruction fetch and data access in a single clock cycle. The 2 MHz oscillator input (the '-02' speed suffix) yields a 2 MHz instruction rate at 4:1 division in standard mode, sufficing for slow-loop control, keypad scanning, and LED multiplexing tasks. The 'A' revision brings enhanced electrical characteristics and the 'I' suffix denotes industrial temperature range. The OTP program memory allows one-time programming via a device programmer, making this part ideal for low-to-medium volume production where mask-ROM NRE is not justified. Typical applications include low-cost consumer appliances, remote controls, toy electronics, sensor signal conditioning, simple motor and relay drivers, LED lighting controllers, and battery-powered timers. The wide operating voltage makes it suitable for 2x AA / single Li-ion cell systems where 3.3V is the native supply. When designing with the PIC16LV54A-02I/P, note that OTP parts cannot be reprogrammed in-circuit; firmware must be fully validated on a windowed PIC16CR54A or flash-based PIC16F54 equivalent before committing to OTP. The 18-pin PDIP through-hole footprint simplifies prototyping on breadboards and through-hole PCBs, but for SMT production migrate to the PIC16LV54A-02I/SO (SOIC-18) variant. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes beyond the manufacturer datasheet summary, including parametric proximity data for cross-brand 8-bit MCU equivalents.

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PIC16LV54A-02I/SO - 8-bit MCU, 768B OTP, 2MHz, 18-SOIC | Microchip
PIC16LV54A-02I/SO

PIC16LV54A-02I/SO - 8-bit MCU, 768B OTP, 2MHz, 18-SOIC | Microchip

The Microchip Technology PIC16LV54A-02I/SO is an EPROM/ROM-based 8-bit CMOS microcontroller belonging to the PIC16C5X family, delivering 2 MHz instruction execution from a 768-byte (512 × 12) OTP program memory and 25 bytes of data RAM, housed in an 18-pin SOIC (SO) package. It integrates 12 I/O pins, an 8-bit real-time clock/counter (TMR0), a two-level deep hardware stack, and a watchdog timer for reliable embedded control. The 'LV' designation indicates low-voltage operation supporting 2V to 3.8V supply, while the '02' suffix denotes 2 MHz maximum clock speed and the 'I' suffix specifies industrial temperature range (-40°C to +85°C). An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals on one silicon die. Within the broader taxonomy, the PIC16LV54A belongs to the 8-bit MCU class, which itself falls under microcontrollers, integrated circuits, and ultimately semiconductors. The PIC architecture uses a RISC-like instruction set with 12-bit wide opcodes and an 8-bit data path, achieving 2:1 code compression over typical 8-bit CISC competitors. Key features include 33 single-word instructions (industry-standard PIC instruction set), seven or eight special-function hardware registers, direct/indirect/relative addressing modes for both data and instructions, and low-power CMOS technology. The device consumes very low quiescent current in standby mode, making it suitable for battery-powered and energy-constrained applications. The 8-bit timer/counter TMR0 with a programmable prescaler supports timing, event counting, and simple PWM generation. Technically, the PIC16LV54A uses a Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and data access. The OTP (one-time programmable) memory supports field programming via standard Microchip development tools. Internal oscillator options and external clock input flexibility allow designers to trade off cost, accuracy, and power consumption. The two-level hardware stack limits call depth, which is typical for low-pin-count baseline PIC microcontrollers. Typical applications include battery-powered sensor interfaces, low-cost consumer electronics, appliance controllers, simple LED driving circuits, and industrial automation edge devices. Its 12 I/O pins, small footprint, and low-voltage operation also suit it for handheld instruments and wearable accessories where power efficiency and PCB area are critical. When designing with the PIC16LV54A-02I/SO, ensure VDD decoupling with 100 nF ceramic capacitors placed close to the supply pins. For OTP programming, leave the MCLR/VPP pin accessible on the PCB. Stack depth limitation requires careful coding - avoid nested subroutines beyond two levels. For new designs, consider the flash-based PIC16F54-I/SO as an alternative, which offers in-circuit reprogrammability in the same 18-SOIC footprint. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. The cross-reference data is sourced from live distributor and cross-reference tools, providing verified parametric similarity for engineers evaluating second-source options.

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PIC16LV54A-02I/SS - 8-bit 2MHz 768B OTP MCU | Microchip | SSOP-20
PIC16LV54A-02I/SS

PIC16LV54A-02I/SS - 8-bit 2MHz 768B OTP MCU | Microchip | SSOP-20

The Microchip Technology PIC16LV54A-02I/SS is an 8-bit RISC microcontroller from the PIC16C5x family operating at up to 2 MHz, housed in a 20-pin SSOP package and offering 768B (512 x 12) of one-time programmable (OTP) program memory. It is the low-voltage 'LV' variant of the PIC16C54A, supporting a 2.0V to 5.5V supply range with 12 I/O pins and 25 bytes of general-purpose RAM. The device targets cost-sensitive embedded control in industrial and automotive environments, with an industrial operating temperature range of -40C to +85C. What is an 8-bit OTP microcontroller? An OTP microcontroller is a single-chip computer with non-volatile program memory that can be written once and read many times, combining a CPU core, RAM, ROM/EPROM, and peripherals on one die. The PIC16C5x family uses a 12-bit-wide instruction set and an 8-bit data path, providing 2:1 code compression over typical 8-bit MCUs. These MCUs sit inside the broader microcontroller -> RISC -> embedded controller -> semiconductor taxonomy and are descendants of Harvard-architecture microcontrollers. Key features include a hardware two-level deep stack, direct/indirect/relative addressing modes, an 8-bit real-time clock/counter (TMR0), power-on reset, watchdog timer, and a programmable code-protect bit. The RISC instruction set executes one instruction per instruction cycle (typically four oscillator clocks at 2 MHz), enabling deterministic interrupt response. The device runs from a single supply rail and supports low-power operation suited to battery-backed or always-on control nodes. Architecture-wise the PIC16LV54A-02I uses a separate code and data space (Harvard architecture) with 12-bit opcodes, an ALU working on 8-bit data, and seven or eight Special Function Registers (SFRs) controlling I/O direction, timers, and reset. Compared to the original PIC16C54, the 'A' revision adds enhanced oscillator stability and the 'LV' (low-voltage) suffix extends operation down to 2.0 V, making it suitable for 2xAA battery or 3.3 V regulated systems. Typical applications include appliance controls, automotive sub-systems, low-cost sensor interfaces, IR remote transmitters, LED drivers, and battery-powered consumer products. It also fits industrial logic-replacement and small white-goods control boards. A common design tip: provide a decoupling capacitor of 0.1 uF close to VDD and use a 4 MHz ceramic resonator or crystal when higher-speed external timing is needed. This page synthesizes distributor pricing, drop-in PIC16C5x family alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16LV54AT-02I/SS - 0.75KB OTP 8-bit MCU, 2MHz, SSOP-18
PIC16LV54AT-02I/SS

PIC16LV54AT-02I/SS - 0.75KB OTP 8-bit MCU, 2MHz, SSOP-18

The Microchip Technology PIC16LV54AT-02I/SS is an 8-bit EPROM/ROM-based CMOS microcontroller in the PIC16C5X family, delivering 0.75 KB (768 B) of one-time-programmable program memory, 25 bytes of RAM, and 12 I/O pins in a 20-pin SSOP package. The 'LV' suffix denotes a low-voltage variant operating from 3V to 5.5V, while the 'A' suffix marks the enhanced instruction set revision, and the 'T' suffix identifies tape-and-reel packaging. With a 2 MHz maximum clock and 12-bit-wide instructions feeding an 8-bit data path, the device targets cost-sensitive embedded control where ROM-equivalent code storage is acceptable. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, integrating a CPU core, non-volatile program memory, working RAM, digital I/O, and peripheral blocks such as timers and interrupts on one die. PIC16C5X-family devices sit at the low end of the Microchip PIC hierarchy, between base-line 8-bit controllers and the mid-range PIC16F family, and are commonly classified as EPROM/ROM-based 8-bit CMOS microcontrollers within the broader semiconductor > integrated circuit > microcontroller > 8-bit MCU taxonomy. Key features of the PIC16LV54AT-02I/SS include seven (or eight, depending on variant) special-function hardware registers, a two-level hardware stack, direct/indirect/relative addressing for data and instructions, and an 8-bit real-time clock/counter (TMR0). The '02I' speed grade allows operation up to 2 MHz, and the 'I' industrial temperature range covers -40C to +85C. Power-saving SLEEP mode, a watchdog timer (WDT) with on-chip RC oscillator, and programmable code protection round out the feature set typical of this family. Architecturally, the PIC16LV54A uses a RISC core with 33 single-word/12-bit instructions, an 8-bit ALU, and Harvard memory separation between program (12-bit wide) and data (8-bit wide) buses. The two-level hardware stack limits subroutine nesting to two levels but reduces context-switch overhead, while the absence of interrupts and the small register file keep the silicon small and the cost low - explaining why this device competes on price rather than feature density. Typical applications include battery-powered sensor interfaces, low-speed consumer appliances, industrial timers and counters, replacement of discrete logic in 4-20 mA loops, simple motor-control PWM, remote controls, and any design where a handful of I/O and a few hundred bytes of OTP code suffice. Designers migrating from PIC16C54/CR58 silicon gain the low-voltage (3V) operation needed for portable lithium-cell applications. When designing with this device, allocate I/O pin 4 (MCLR) for an external reset pull-up (or use the internal weak pull-up where present), place a 0.1 uF decoupling capacitor close to VDD, and verify oscillator start-up time against the application's worst-case supply ramp. Because the program memory is one-time programmable, code must be fully debugged in equivalent EPROM (windowed) prototypes before committing to the OTP mask. This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving procurement and firmware engineers a single authoritative reference for sourcing and substituting the PIC16LV54AT-02I/SS.

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

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

The Microchip Technology PIC17C42A-16/L is a high-performance 8-bit CMOS EPROM/ROM microcontroller built on the PIC17C architecture, delivering up to 16 MHz CPU clock and 4 KB (2K x 16) of One-Time-Programmable (OTP) program memory in a 44-pin PLCC (J-Lead) package. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, RAM, peripherals, and I/O on one silicon die. PIC microcontrollers from Microchip use a RISC-based Harvard architecture where separate program and data buses allow simultaneous instruction fetch and operand access. The PIC17C family sits above the PIC16C line in performance, offering higher MIPS, larger address spaces, and richer peripherals, while remaining code-compatible with the PIC16C5X, PIC12CXXX, and PIC16CXX instruction-set families. Key features of the PIC17C42A include 8.25 MIPS throughput (121 ns instruction cycle), 232 bytes of general-purpose RAM, 33 digital I/O lines, a hardware USART for serial communication, two 8-bit timers plus two 16-bit timers, and a programmable prescaler. The 16 MHz maximum oscillator yields 8.25 MIPS - among the fastest 8-bit PIC devices in production at its introduction. The OTP program memory supports in-circuit programming via Microchip's standard tools, while the EPROM-based die allows prototype reprogramming through a windowed package variant. Architecturally, the PIC17C42A uses a 16-bit-wide instruction word and an 8-bit data path, with a 64 KB linear program address space and 16-level hardware stack. The USART can operate in asynchronous, synchronous master, and synchronous slave modes, supporting standard baud rates up to 625 kbaud at 16 MHz. Brown-out reset, watchdog timer, and power-on reset are integrated. Typical applications include industrial control, instrumentation, motor control front-ends, sensor signal conditioning, embedded communication bridges, and legacy 8-bit upgrades where PIC16C code must scale up without re-architecting. The wide temperature grade (-40C to +85C commercial) also supports white goods and consumer electronics. When designing with this part, verify that your C compiler or assembler targets the PIC17C instruction set; not all PIC tools support PIC17. The 44-PLCC package is through-hole or socket-mountable, simplifying prototypes and field replacement. This page aggregates current distributor pricing, drop-in package-compatible variants, and practical design notes synthesized from Microchip's PIC17C4X datasheet family and the PIC17C42A Errata (DS30412C) - information not consolidated on any single distributor page.

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

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

The Microchip Technology PIC17C42A-16/P is an 8-bit high-performance CMOS EPROM/ROM microcontroller built on the PIC17C architecture and housed in a 40-pin PDIP (0.600", 15.24 mm) through-hole package. It runs at 16 MHz maximum clock input, executes instructions in 121 ns (8.25 MIPS), and integrates 4 KB of OTP program memory (2K x 16) plus 232 bytes of data RAM for embedded control tasks. What is a PIC microcontroller? A PIC microcontroller is a family of RISC-based microcontrollers from Microchip Technology that combine a CPU core, program memory, data RAM, peripherals, and I/O pins on a single CMOS die. PIC microcontrollers sit in the broader hierarchy of microcontroller -> embedded controller -> semiconductor IC, and the PIC17C sub-family specifically targets higher-performance 8-bit designs that need more code space, more I/O, and hardware features beyond what the PIC16C5X and PIC16CXX devices provide. Key features of the PIC17C42A-16/P include 33 digital I/O pins, 2 capture inputs, 2 PWM outputs, 2 x 8-bit plus 2 x 16-bit timers (4 timer modules total), a USART for serial communication, external memory addressing, and external oscillator support. The device is OTP (One-Time-Programmable) for code storage and operates across the standard industrial temperature range of -40C to +85C from a 5 V supply. Architecturally, the PIC17C42A uses a Harvard RISC core with only 58 single-word instructions, an 8-level hardware stack, and interrupt handling suited to demanding real-time control. Compared to the older PIC16C5X, it adds extended instructions, wider addressing, and richer peripherals while remaining source-compatible with the PIC16CXX family, allowing designers to upgrade performance without rewriting firmware from scratch. Typical applications include industrial control systems, motor drive front-ends, smart sensor nodes, embedded instrumentation, and white-goods appliance controllers. The combination of 33 I/O lines and 4 KB of code storage fits mid-range embedded products where deterministic real-time behavior matters. When designing with this part, plan for OTP programming: the program memory cannot be erased, so production code must be fully verified before blow. Use the matching windowed ceramic (JW) variant for prototype development, then move to the OTP "P" package for production builds. Microchip recommends migrating to the PIC18F4220 for new designs, but the PIC17C42A-16/P remains a supported legacy option.

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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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