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PIC16C558T-04/SO

PIC16C558T-04/SO - 8-bit 4MHz MCU, 3.5KB OTP, 18-SOIC | Microchip

The Microchip Technology PIC16C558T-04/SO is an 8-bit CMOS OTP-based microcontroller from the PIC16C5x family, executing one instruction every 200 ns at 4 MHz and packaged in an 18-pin SOIC (SO) wide-body outline. It integrates 3.5 KB of one-time-programmable program memory (2K x 14 words), 128 bytes of RAM, and 13 digital I/O pins in a compact surface-mount form factor. A microcontroller (MCU) is a single-chip computer containing a processor core, program memory, working RAM, and programmable I/O peripherals on one die. Within the broader taxonomy, this device sits in the 8-bit microcontrollers category, which belongs to microcontrollers and, higher up, integrated circuits and semiconductors. PIC16C5x parts are classical Harvard-architecture MCUs using the PIC instruction set, and they were widely adopted in automotive, industrial, and appliance products because of their small footprint, deterministic timing, and only 35 single-word instructions. Key features include a 4 MHz maximum oscillator frequency (4 MHz internal instruction rate of 5 MIPS equivalent), a 12-bit instruction word, 8-bit data path, 2.0 V to 6.25 V operating voltage range (the /SO part is the commercial 0 to +70 C grade), an 8-bit timer/counter, watchdog timer, internal pull-ups on port B, and code protection. The 18-SOIC wide-body package offers 7.5 mm (0.300 inch) creepage distance, which is useful when the part sits next to mains-isolated sections in consumer white goods. The PIC16C558T-04/SO uses Microchip's proven OTP process technology, allowing prototype cost flexibility while still offering one-time field programming. The architecture separates program and data buses (Harvard) so that an instruction fetch and a data access happen in parallel, simplifying deterministic timing for control loops. With 13 usable I/O pins, designers can drive LED indicators, read keypad matrices, and interface to sensors without external glue logic. Typical applications include automotive body controllers and interior lighting, industrial control panels, appliance controllers (rice cookers, microwave ovens, washing machines), low-end remote-control toys, simple sensor interfaces, and battery chargers. The /04 speed grade specifies 4 MHz maximum oscillator, while the /SO suffix designates the SOIC wide-body commercial package. When designing with this device, remember that OTP memory cannot be erased, so firmware must be fully validated before committing to production units. Decoupling the VDD pin with 0.1 uF ceramic placed within 5 mm of the package, plus a bulk 1-10 uF tantalum or aluminum capacitor, is recommended for noisy industrial environments. This page synthesizes distributor pricing, drop-in same-package alternatives from the Microchip PIC16C5x family, and practical design notes that go beyond what the manufacturer datasheet alone provides, giving engineers a complete selection view.

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PIC16C558T-04/SS

PIC16C558T-04/SS - 8-Bit OTP MCU, 4MHz, 3.5KB | Microchip

The Microchip PIC16C558T-04/SS is an 8-bit CMOS OTP-based microcontroller in the PIC® 16C family, delivering 4 MHz CPU performance with 3.5 KB (2K × 14) of program memory in a 20-pin SSOP package. It features 35 single-word instructions, 200 ns instruction execution time, and 13 bidirectional I/O pins suitable for cost-sensitive embedded control. An 8-bit microcontroller (MCU) is a single-chip computer with an 8-bit data path, integrating a CPU, RAM, ROM/Flash/EPROM, and peripherals. OTP (One-Time Programmable) variants use EPROM-based program memory, which is programmed once with a device programmer and cannot be erased, making OTP MCUs the lowest-cost option for high-volume, fixed-code consumer and industrial products. PIC microcontrollers follow the RISC (Reduced Instruction Set Computer) Harvard architecture, separating program and data memory buses for deterministic instruction timing. Key features of the PIC16C558T-04/SS include 4 MHz maximum operating frequency, 128 bytes of RAM, 13 I/O pins with individual direction control, a watchdog timer with on-chip RC oscillator, power-on reset, power-saving SLEEP mode, and an operating voltage range of 3.0 V to 6.25 V. The '04' speed suffix indicates a 4 MHz oscillator; the 'T' suffix denotes tape-and-reel packaging; '/SS' designates the 20-pin SSOP (Shrink Small Outline Package). The PIC16C558T-04/SS uses a 14-bit-wide instruction word and 8-bit data path, with a hardware stack and interrupt logic supporting wake-up from SLEEP on pin change. Code protection is enabled via EPROM fuse bits. Compared with Flash-based PIC16F parts, this OTP MCU is intended for mature, high-volume programs where field firmware updates are not required. Typical applications include appliance control, sensor signal conditioning, low-speed serial control loops, hobby and educational projects, LED driving, and replacement of discrete logic in fixed-function control boards. The 13 I/O pins can source/sink up to 25 mA per pin, sufficient to drive small relays, solenoids, and LED arrays directly. When designing with this part, ensure your programming flow includes EPROM fuse configuration because code protection cannot be changed once blown. For new designs, evaluate Flash-based PIC16F equivalents first; the OTP variant is most cost-effective for locked, high-volume code. This page synthesizes distributor pricing, drop-in alternatives, and design notes that go beyond the bare datasheet content to help engineers select, source, and qualify the PIC16C558T-04/SS with confidence.

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PIC16C558T-04E/SS

PIC16C558T-04E/SS - 4MHz 8-bit OTP MCU, 20-SSOP | Microchip

The Microchip Technology PIC16C558T-04E/SS is an 8-bit CMOS OTP-based microcontroller in the PIC® 16C family, delivering 4MHz CPU clock speed, 3.5KB (2K x 14) of One-Time Programmable program memory, 128 bytes of RAM, and 13 programmable I/O pins, all packaged in a 20-pin SSOP (5.30 mm body). It executes instructions in 200 nanoseconds through a RISC architecture with only 35 single-word instructions, balancing deterministic performance with low power consumption in a compact 18-pin-equivalent footprint. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, working RAM, and configurable peripherals. OTP microcontrollers store program code in one-time-programmable EPROM cells that retain data without power but cannot be rewritten, making them well-suited to cost-sensitive volume production where firmware is stable. The PIC16C558 belongs to the PICmicro mid-range family - a lineage of 8-bit MCUs known for deterministic interrupt latency, a Harvard memory architecture, and an instruction set optimized for compiled C and hand-written assembly. Key features include a 4MHz internal oscillator-friendly design with external clock option, 128 x 8 bytes of general-purpose RAM, Power-On Reset (POR), Watchdog Timer (WDT) with on-chip RC oscillator, 13 bi-directional digital I/O pins, and code-protection support. The industrial-grade temperature range of -40C to +125C and 3.0V to 5.5V supply enable deployment in factory-floor and consumer applications. The PIC16C558 uses a 14-bit instruction word with an 8-bit data path, separating program and data buses (Harvard architecture) so instruction fetch and data access occur in the same cycle. Peripherals are minimal by design: POR, WDT, and a programmable prescaler - this simplicity keeps quiescent current low and lets the MCU wake quickly from sleep. Typical applications include industrial sensor interfaces, consumer appliance control, automotive body electronics (non-safety), HVAC thermostat controllers, and low-end motor control. The OTP memory is favored where unit cost dominates over firmware flexibility. The 20-SSOP package offers a small PCB footprint suitable for hand-held and space-constrained designs. When designing with the PIC16C558, evaluate code protection settings and pre-program all units before final test because OTP cannot be erased. Account for the 13 I/O limitation versus larger PIC16C variants (e.g., PIC16C56/57 with fewer I/O) when allocating pin resources. This page synthesizes distributor pricing, drop-in alternatives from the Microchip PIC16C family, and practical design notes not found in any single datasheet.

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PIC16C558T-04I/SO

PIC16C558T-04I/SO - 8-bit PIC MCU, 3.5KB OTP, 18-SOIC | Microchip

The Microchip Technology PIC16C558T-04I/SO is a CMOS OTP-based 8-bit PIC microcontroller in a 200 ns instruction execution class, packaged in an 18-pin SOIC (SO) and rated for the -40C to +85C industrial temperature range (I-suffix). The device integrates 3.5KB (2K x 14 words) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, 13 digital I/O pins, and operates from a 2.5V to 5.5V supply. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, volatile data memory (RAM), and programmable peripherals into one package. The PIC16C558 belongs to Microchip's mid-range PIC16C family, which uses a RISC architecture with 35 single-word instructions. Within the broader component taxonomy, an MCU sits below the microprocessor/MCU hypernym and above the PIC16C mid-range sub-family; 8-bit MCUs like this one remain widely used in cost-sensitive, deterministic real-time applications. Key features of the PIC16C558T-04I/SO include a 4 MHz maximum oscillator frequency (the -04 speed grade), 13 bidirectional I/O pins with individual direction control, an 8-bit timer/counter (TMR0) with an 8-bit prescaler, a Watchdog Timer with its own on-chip RC oscillator for reliable recovery, Power-on Reset, Brown-out Reset, and an in-circuit serial programming capability. Code protection and oscillator selection options are programmed into the device's configuration bits. The architecture is built around a Harvard-separated program/data bus with a 14-bit instruction word, allowing most instructions to execute in a single 200 ns instruction cycle at 20 MHz. The '04 speed grade corresponds to a 4 MHz oscillator / 1 MHz instruction rate operation, simplifying EMI and power budgeting in industrial designs. Typical applications include appliance control, automotive subsystems (body electronics, sensors, lighting), industrial automation (sensor interfaces, low-cost PLC I/O expanders), security and access control panels, and remote-control transmitters. The wide 2.5V-5.5V supply range and robust reset architecture make it a fit for harsh, electrically noisy environments. When designing with the PIC16C558T-04I/SO, note that OTP memory cannot be re-programmed; for prototyping or field-upgradable firmware consider a Flash-based PIC16F equivalent. Place a 0.1 uF decoupling capacitor close to VDD, keep oscillator traces short, and respect the 4 MHz oscillator maximum for the -04 speed grade. This page synthesizes distributor pricing as of 2026-09-16, drop-in alternatives drawn from the PIC16C558 same-family cross reference, and practical design notes not consolidated in the manufacturer datasheet.

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PIC16C558T-04I/SS

PIC16C558T-04I/SS - 8-Bit 4MHz OTP MCU, 3.5KB | Microchip

The Microchip Technology PIC16C558T-04I/SS is an 8-bit CMOS OTP-based microcontroller from the PIC® 16C family, featuring a 4MHz maximum clock speed, 3.5KB (2K x 14) of One-Time Programmable program memory, and 128 bytes of RAM, housed in a 20-pin SSOP (Shrink Small Outline Package) for surface-mount assembly. The device integrates 13 general-purpose digital I/O pins, a RISC instruction set with only 35 single-word instructions executing in a 200ns instruction cycle, and supports a supply voltage range compatible with both 3.3V and 5V systems. An OTP (One-Time Programmable) microcontroller is a non-flash, non-EEPROM MCU variant where the program memory can be written exactly once via a dedicated programmer and then becomes read-only permanently. In the broader semiconductor taxonomy, the PIC16C558 sits within 8-bit microcontrollers -> microcontrollers -> microcontrollers and processors -> integrated circuits -> semiconductors. OTP MCUs occupy a specific niche: they are cheaper than flash equivalents, ideal for high-volume mature products, and well-suited for cost-sensitive industrial and automotive subsystems where firmware is finalized and production quantities justify masking the code once. Key specifications of the PIC16C558T-04I/SS include 4MHz maximum oscillator frequency, 3.5KB OTP program memory (2K x 14-bit words), 128 bytes of data RAM, 13 digital I/O pins, two 8-bit timers (Timer0 and Timer2) and one 16-bit timer (Timer1), a watchdog timer with on-chip RC oscillator, and an operating temperature range of -40C to +85C (industrial grade, indicated by the 'I' suffix). The 20-pin SSOP package measures approximately 5.30mm body width with 0.65mm pitch. The device is built on a low-power CMOS process supporting both 3.3V and 5V operation. The RISC architecture ensures deterministic instruction timing with most instructions completing in a single 200ns cycle at 4MHz, simplifying real-time control loops. The integrated watchdog timer with dedicated on-chip RC oscillator enhances system reliability in noisy industrial environments, while the programmable code protection prevents unauthorized firmware readout. Typical applications include automotive subsystems (sensor interfaces, lighting controllers), industrial control (small appliance controllers, motor drivers), consumer electronics (remote controls, toys), and embedded control nodes requiring a minimal pin count. The 13 I/O pins make it suitable for human-machine interface (HMI) keypads and simple sensor front-ends. When designing with the PIC16C558T-04I/SS, engineers should plan firmware development around OTP one-time programming: prototype using a windowed (JW) or UV-erasable sibling for code iteration, then commit to the OTP version only after firmware is finalized. Note that the PIC16C558 is now legacy - for new designs, evaluate flash-based PIC16F equivalents. This page synthesizes distributor pricing, OTP-specific design notes, and a curated drop-in alternative list - practical information that supplements the manufacturer datasheet for legacy design support.

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PIC16C558T-20/SO

PIC16C558T-20/SO - 8-bit 20MHz OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16C558T-20/SO is an 8-bit RISC OTP (One-Time-Programmable) microcontroller built on the PIC16C5xx baseline architecture, delivering 20MHz maximum clock speed in an 18-pin SOIC package. The device integrates 3.5KB (2K x 14) of program memory, 128 bytes of SRAM, and 13 general-purpose digital I/O pins, and is offered in the tape-and-reel SOIC shipping format. The 'T' suffix denotes Tape & Reel packaging while '-20' indicates the 20MHz speed grade; the '/SO' suffix specifies the 18-lead 300-mil Small-Outline IC package. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral interfaces into one package. Within the system hierarchy, an MCU sits above discrete logic and below microprocessors: it is a self-contained compute subsystem optimized for embedded control rather than high-throughput computation. Microchip's PIC baseline family (PIC16C5xx) is the lowest-cost and simplest tier of the PIC16 lineup, designed for cost-sensitive applications where code density and ease of programming outweigh the need for interrupts and advanced peripherals. Key features of the PIC16C558T-20/SO include the 35 single-word instruction RISC core that executes instructions in 200ns at 20MHz, a fixed watchdog timer (WDT) and Power-On Reset (POR) for unattended operation, and a wide operating voltage range of 3.0V to 5.5V. Unlike PIC16F and PIC16 enhanced mid-range parts, the PIC16C558 lacks interrupts, has a 12-bit program counter, and uses a 2-level hardware stack. The 13 I/O pins are organized as PORTA (RA0-RA3) and PORTB (RB0-RB7) plus RC0-RC1 in this 18-pin variant. Typical applications for this device include simple appliance controls, LED drivers, fan controllers, battery chargers, security keypads, and consumer toys where the OTP memory is acceptable and code density in 12-bit-wide words is sufficient. The wide commercial temperature grade and low pin count make it well-suited to compact hand-held products. When designing with the PIC16C558T-20/SO, ensure the OTP memory capacity (3.5KB) is sufficient for the target firmware and verify that the lack of interrupts and 2-level stack depth are compatible with the application complexity. The external RC or crystal oscillator configuration must follow the baseline PIC16C5xx reference designs because this family does not include the internal oscillator blocks of later PIC generations.

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PIC16C558T-20/SS

PIC16C558T-20/SS - 8-Bit 20MHz OTP MCU 20-SSOP | Microchip

The Microchip Technology PIC16C558T-20/SS is an 8-bit RISC-based CMOS microcontroller from the PIC16C5x family, featuring 3.5KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 20MHz maximum operating frequency, packaged in a 20-pin SSOP (Shrink Small Outline Package). Built on Microchip's classic PIC 16C5x baseline architecture with a 12-bit instruction word, the device delivers deterministic interrupt response and Harvard bus separation, supporting the same legacy instruction set as other PIC16C5x members. What is an OTP microcontroller? An OTP (One-Time-Programmable) microcontroller contains EPROM-based program memory that can be written once during production programming and cannot be electrically erased. Compared to flash-based MCUs, OTP parts offer lower unit cost for high-volume production runs where firmware is finalized, and they provide higher density and radiation tolerance. The PIC16C558T belongs to the broader 8-bit microcontroller category -> CMOS RISC microcontroller -> embedded controller -> MCU -> semiconductor, occupying the entry-level / cost-optimized tier of the PIC16C5x family tree. Key features include 13 I/O pins with individual direction control, two 8-bit timers (Timer0 and Timer2), a Watchdog Timer with on-chip RC oscillator, power-on reset, brown-out detection, and a 4-channel 8-bit ADC. The device operates from 2.5V to 5.5V and is rated for the commercial temperature range (0C to +70C). Its 20MHz clock rate yields a 200ns instruction cycle, sufficient for servo loops, sensor sampling, and simple protocol handling. The architecture uses a RISC-style pipeline with only 33 single-cycle instructions, dramatically simplifying code generation in assembly or C. Internal peripheral integration (ADC, timers, WDT, POR/BOR) eliminates many external components, enabling compact PCB layouts and reducing BOM cost. The SSOP-20 footprint is compatible with the rest of the PIC16C5x family (PIC16C554, PIC16C55, PIC16C57, PIC16C58) where pin counts match, allowing PCB reuse across product variants. Typical applications include appliance control, simple sensor interfaces, low-end consumer electronics, motor control front-ends, smart battery chargers, and remote controls. Engineers continue to design with PIC16C558 in legacy products where the OTP cost model fits the bill of materials and existing firmware has been qualified for years. The 'T' suffix indicates tape-and-reel packaging for high-volume SMT assembly. When designing with this part, ensure programming is completed before final PCB assembly because OTP memory cannot be updated in the field. Use Microchip's PICSTART Plus or MPLAB PM3 programmer, and verify code protection bits are set if intellectual property protection is required. Decoupling: place a 0.1uF ceramic capacitor directly across VDD/VSS within 5mm of the pins. This page synthesizes distributor stock data, drop-in alternatives from the PIC16C5x family, and design notes that go beyond the manufacturer datasheet to help engineers select, source, and integrate the PIC16C558T-20/SS.

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PIC16C558T-20E/SS

PIC16C558T-20E/SS - 8-Bit OTP MCU, 20MHz, 3.5KB | Microchip

The Microchip Technology PIC16C558T-20E/SS is an 8-bit RISC microcontroller from the PIC16C family, featuring a 20 MHz maximum operating frequency, 3.5 KB (2K x 14) of One-Time Programmable (OTP) program memory, and 128 bytes of RAM, packaged in a 20-pin SSOP (Shrink Small Outline Package). The 'T' suffix denotes Tape and Reel packaging while the 'E' designator indicates the Extended industrial temperature grade of -40C to +125C, and 'SS' specifies the SSOP-20 package outline. An 8-bit microcontroller (MCU) is a small computing system on a single integrated circuit that combines a CPU, RAM, non-volatile program memory, and configurable I/O peripherals. PIC microcontrollers use a RISC (Reduced Instruction Set Computer) architecture with a Harvard memory structure, providing deterministic instruction execution in a single clock cycle for most instructions. PIC MCUs sit within the broader hierarchy of embedded microcontrollers, beneath microprocessors in complexity but above simple state machines in programmability. Key features of the PIC16C558T-20E/SS include 13 digital I/O pins, a 20 MHz internal oscillator operating frequency at 5V, an 8-bit timer/counter, watchdog timer, power-on reset, brown-out detection, and an instruction set of 35 single-word instructions. The OTP program memory allows the device to be programmed once and retains the code permanently without the need for external program storage. The PIC16C558 architecture employs a 14-bit instruction word with a 14-bit program memory bus, distinct from the 8-bit data bus. This dual-bus Harvard architecture enables simultaneous instruction fetch and data access, achieving near one-instruction-per-clock throughput. The device operates from 3.0V to 5.5V supply voltage and is fabricated using Microchip's proprietary CMOS process with low-power CMOS technology. Typical applications include industrial control systems, automotive body electronics, sensor interfacing nodes, low-cost consumer appliances, and battery-powered embedded devices. The extended temperature range and OTP memory make it suitable for high-volume production where code is finalized and reprogramming is unnecessary. When designing with this OTP device, ensure code is fully validated before programming since OTP cannot be erased or rewritten. Engineers should use the equivalent flash-based PIC16F558 for prototype development and validation, then transition to this OTP version for cost-optimized production runs. This page synthesizes distributor pricing snapshots, same-brand Microchip drop-in alternatives, and practical design guidance not aggregated in any single manufacturer document, enabling faster sourcing and engineering decisions.

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PIC16C558T-20I/SO

PIC16C558T-20I/SO - 8-Bit 20MHz 3.5KB OTP MCU | Microchip

The Microchip Technology PIC16C558T-20I/SO is a member of the PIC16C5x family of 8-bit RISC microcontrollers, featuring a 20MHz maximum clock rate, 3.5KB (2K x 14) of One-Time-Programmable (OTP) program memory, and 128 bytes of RAM, all housed in an 18-pin SOIC package. It executes instructions in a 200ns instruction cycle and operates from a single 3.0V to 5.5V supply, drawing only a few milliamps during normal operation. A microcontroller (MCU) is a single-chip computer containing a CPU, memory, and programmable I/O peripherals. The PIC16C5x family uses a Harvard-architecture RISC core with 33 single-word instructions, delivering deterministic throughput for embedded control. Within the broader hierarchy, the PIC16C558 sits between the smaller PIC12/14 families (typically 6-14 pins) and the larger PIC16F and PIC18 families; it is designed for cost-sensitive 18-pin applications that need more code space than PIC16C54/55/56 but fewer peripherals than modern PIC16F1xxx devices. Key features of the PIC16C558T-20I/SO include 13 digital I/O pins, a Power-On Reset (POR), Watchdog Timer (WDT), and a Timer0 8-bit counter/timer. The '20' speed suffix indicates the 20MHz maximum oscillator frequency, while the 'T' indicates tape-and-reel packaging, 'I' specifies the industrial -40C to +85C operating temperature range, and '/SO' denotes the 18-pin SOIC outline. The OTP memory is programmed once via standard Microchip device programmers, making the part ideal for high-volume, low-cost field-deployed products where firmware is stable and flash reprogrammability is not required. Typical applications include appliance controllers, sensor signal conditioning front-ends, simple motor control drivers, automotive body electronics, lighting controllers, low-end remote keyless entry transmitters, security alarm panels, and battery-powered instrumentation. Because OTP memory cannot be erased and rewritten, designers typically prototype with the PIC16F558 (Flash) equivalent and migrate to the PIC16C558 once firmware is finalized. A key design consideration is migration from the Flash PIC16F558: the two parts share pinout and core peripherals, allowing a single PCB to support both. Use a 4.7kohm pull-up on MCLR/VPP and 100nF decoupling on VDD, with a 22pF or 33pF load capacitor pair on OSC1/OSC2 for a crystal oscillator reference design.

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PIC16C55A-04/P

PIC16C55A-04/P - 8-Bit 4MHz OTP MCU 20 I/O | Microchip

The Microchip PIC16C55A-04/P is an 8-bit RISC microcontroller from the PIC16C5X family, featuring 4MHz maximum clock speed, 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory, 24 bytes of RAM, and 20 digital I/O pins in a 28-pin PDIP (Plastic DIP) through-hole package. The -04 speed suffix denotes a 4MHz oscillator range, and the /P suffix denotes the PDIP package. A microcontroller (MCU) is a single-chip computer containing a processor core, memory, and programmable I/O peripherals, used in embedded applications where a full microprocessor would be too costly or power-hungry. The PIC16C5X family employs a RISC architecture with 33 single-word/single-cycle instructions, achieving 2:1 code compression over competitive 8-bit MCUs in its class, and uses 12-bit-wide instructions with an 8-bit-wide data path. Key features include seven or eight special-function hardware registers, a two-level-deep hardware stack, direct/indirect/relative addressing modes for data and instructions, an 8-bit real-time clock/counter (TMR0), and supply-voltage operation of 3.0V to 6.25V. The 20 I/O pins each support independent direction control, and the OTP program memory is programmed via Microchip's MPLAB PM3 Universal Device Programmer. The PIC16C5X architecture is fully static CMOS, meaning the clock can be stopped without losing register state - useful for low-power applications. Two instruction-fetch methods (call/branch timing variations) are supported. Power-on reset and watchdog timer peripherals are integrated, and the chip operates over the standard 0C to +70C commercial temperature range (industrial variants use the -I suffix). Typical applications include appliance controllers, simple sensor interfaces, hobby/educational projects, replacement of discrete logic, automotive interior modules, and any low-cost high-volume embedded design requiring 20 or fewer I/O pins. The OTP memory is well-suited for production designs where program stability has been finalized. When designing with this device, note that the PIC16C5X has no on-chip debug and requires a separate programmer - migrate to PIC16F5X or PIC16F core devices with Flash memory and ICSP for new designs that require in-circuit programming. Decoupling capacitors (0.1uF ceramic near VDD) and a clean reset circuit are essential for reliable operation. This page synthesizes distributor pricing, drop-in alternatives, and design considerations not consolidated in the manufacturer datasheet.

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PIC16C55A-04/SO

PIC16C55A-04/SO - 8-Bit 4MHz OTP MCU 768B | Microchip | SOIC-28

The Microchip Technology PIC16C55A-04/SO is an 8-bit RISC microcontroller from the PIC16C5x family, featuring a 4 MHz maximum clock, 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory, and 24 bytes of RAM, all housed in a 28-pin SOIC package. It executes instructions using a reduced RISC architecture with only 33 single-word/single-cycle instructions, enabling deterministic throughput for embedded control. The OTP memory makes it ideal for volume production where firmware is finalized and unit cost matters more than field reprogrammability. An 8-bit microcontroller (MCU) is a single-chip computer integrating a CPU, RAM, program memory (ROM/EPROM/Flash/OTP), and peripherals such as I/O ports, timers, and communication interfaces on one die. Within the broader power management and embedded hierarchy, MCUs sit alongside DSPs, FPGAs, and microprocessors as programmable logic devices. The PIC16C5x family occupies the low-cost, high-performance niche for cost-sensitive appliance, automotive accessory, and industrial sensor applications. Key features of the PIC16C55A-04/SO include 20 digital I/O pins, a 12-bit instruction word with 8-bit data path, an operating voltage range of 3.0V to 6.25V, and CMOS fully-static design that allows clock rates down to DC for low-power standby. The 4 MHz version (the "/04" suffix) targets applications where 1 microsecond instruction execution is sufficient. It supports in-circuit serial programming via Microchip's legacy tools and provides power-on reset and watchdog timer functionality in the baseline PIC16C5x feature set. Architecturally, the PIC16C55A uses a Harvard memory layout with separate program and data buses, a 2-level hardware stack, and direct/indirect addressing modes. The device is fabricated on a CMOS process optimized for low quiescent current, and its 4 MHz speed grade is the most common production variant. According to Microchip's documentation, the PIC16C5x series is the foundation on which later PIC16 and PIC18 architectures were developed. Typical applications include appliance control boards, LED display drivers, simple sensor interfaces, remote controls, and low-cost industrial timers. Its wide 3.0V-6.25V supply range also makes it compatible with legacy 5V logic designs and unregulated supplies in cost-optimized products. When designing with this part, note that the OTP memory cannot be erased - code must be verified before programming. Engineers should reserve engineering samples for development and use windowed ceramic or Flash-based PIC16F parts during prototyping before locking in the OTP variant for production. This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet, including guidance on migrating from the C variant to the lower-cost F (Flash) versions.

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PIC16C55A-04/SP

PIC16C55A-04/SP - 8-bit OTP MCU, 768B, 20 I/O | Microchip

The Microchip Technology PIC16C55A-04/SP is an 8-bit RISC microcontroller from the PIC16C5x baseline family, delivering 4 MHz CPU performance with 768 bytes of One-Time-Programmable (OTP) program memory organized as 512 x 12-bit words. Housed in a 28-pin SPDIP (Skinny Plastic DIP) through-hole package, this industrial-temperature-rated MCU exposes 20 digital I/O pins, 24 bytes of data RAM, and a single 8-bit timer/counter (TMR0). Its 12-bit instruction word and 2:1 code compression deliver a RISC instruction set that fits more functionality into a smaller memory footprint than competing 8-bit architectures. A baseline PIC microcontroller is a member of Microchip's PIC16C5x family — a family of 8-bit Harvard-architecture RISC microcontrollers built around a 12-bit program word, 8-bit data path, and a small register file. Within the broader taxonomy, a PIC baseline MCU is a microcontroller (MCU) — a single-chip processor integrating core, non-volatile program memory, RAM, I/O, and timers — which itself is a sub-category of embedded microcontrollers and ultimately of integrated circuits for embedded control. The PIC16C5x baseline family targets cost-sensitive, deterministic, interrupt-free control loops where predictability and small code size outweigh the need for analog peripherals or large RAM. Key features of the PIC16C55A-04/SP include: a two-level deep hardware stack for subroutine nesting, direct/indirect/relative addressing modes for compact pointer arithmetic, 8-bit real-time clock/counter (TMR0) with software-programmable prescaler, and a wide 2.5 V to 6.25 V operating voltage range. The device is specified over the commercial 0°C to +70°C temperature range, supports an external oscillator or RC clock source, and offers brown-out protection variants across the broader PIC16C5x family. The '04' speed suffix denotes the 4 MHz maximum oscillator grade. Typical applications for the PIC16C55A-04/SP include consumer appliance control, low-end toys and education, simple sensor signal conditioning, replacement of discrete logic in glue-controller roles, and white-goods timer/sequencer boards. The 20-pin-equivalent of GPIO and small code footprint also make it a popular choice for learning and hobbyist platforms that emulate older PIC16C5x development kits. When designing with the PIC16C55A-04/SP, observe that OTP memory requires masked-programmer flow at production time — engineering builds typically use a windowed (JW) or UV-erasable variant for iteration. Pin compatibility with the PIC16C54 and PIC16C56 families enables a single PCB layout to support several memory-density options across the product line. This page synthesizes distributor stock and pricing, drop-in PIC16C5x pin-compatible alternatives, and practical design notes not present in the bare Microchip datasheet, providing an engineering decision aid rather than a re-statement of specifications.

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PIC16C55A-04/SS

PIC16C55A-04/SS - 8-Bit 4MHz OTP MCU 0.75KB SSOP-28 | Microchip

The Microchip Technology PIC16C55A-04/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, operating at up to 4 MHz with 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory, 24 bytes of data RAM, and 20 digital I/O pins in a 28-pin SSOP (Shrink Small Outline Package). It uses a RISC architecture with 33 single-word, single-cycle instructions, a 12-bit instruction width with an 8-bit data path, and a two-level hardware stack. The "-04" speed grade specifies a 4 MHz maximum oscillator frequency, while the "A" suffix denotes the silicon revision with improved electrical characteristics over the original PIC16C55. An 8-bit OTP microcontroller is a single-chip computer that integrates CPU, non-volatile program memory (programmable once and not erasable in OTP variants), RAM, and peripheral I/O on one die. It belongs to the microcontroller hierarchy: microcontroller -> embedded MCU -> 8-bit MCU -> PIC16C5X family -> PIC16C55A derivative. OTP devices are favored in cost-sensitive, high-volume production where firmware is stable and in-system reprogrammability is unnecessary, offering lower per-unit cost than flash equivalents. Key features include seven or eight special-function hardware registers, an 8-bit real-time clock/counter (TMR0) with programmable prescaler, direct/indirect/relative addressing modes for both data and instructions, an internal power-on reset, a watchdog timer with on-chip RC oscillator, power-saving SLEEP mode, and selectable oscillator options (RC, XT, HS, LP). The device operates from 2.5 V to 6.25 V across commercial 0C to +70C temperature range. Typical applications include appliance control, electronic toys, automotive sub-systems (body controllers, lighting), industrial timers and counters, security-system keypads, low-end remote controls, smart sensors, and consumer white-goods. The 20 I/O pins easily drive LED arrays, key-scan matrices, character LCDs (via external driver), and discrete logic interfaces. The wide 2.5-6.25 V supply range permits direct battery operation from 3 V coin cells, two AA cells, or regulated 5 V rails. When designing with PIC16C55A-04/SS, allocate the oscillator and decoupling capacitors adjacent to the device, and observe the 4 MHz oscillator ceiling. Because the program memory is OTP, code must be fully validated on a windowed (PIC16C55A/JW) or FLASH prototype (PIC16F equivalent) before committing to OTP volume production. Use the PICSTART Plus or MPLAB PM3 programmer for device programming.

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PIC16C55A-04E/P

PIC16C55A-04E/P - 8-Bit 4MHz OTP MCU, 768B, 28-PDIP | Microchip

The Microchip Technology PIC16C55A-04E/P is an 8-bit EPROM-based microcontroller belonging to the PIC16C5X family, delivering 4 MHz maximum clock speed in a 28-pin PDIP (Plastic Dual In-line Package) through-hole form factor. The device integrates 768 bytes of program memory organized as 512 x 12 words and 25 bytes of data RAM, with 20 digital I/O lines arranged across ports A, B and C. It is offered in the automotive / extended temperature grade. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and programmable I/O peripherals. The PIC16C5X family from Microchip is a classic baseline architecture employing a RISC instruction set with only 33 single-word, single-cycle instructions, achieving 2:1 code compression over competitive 8-bit microcontrollers in the same cost tier. Positioned within the broader semiconductor hierarchy, this device sits below modern PIC16 enhanced mid-range and PIC18 high-performance cores, but remains in production for long-life industrial and automotive designs that were qualified against the original PIC16C5X silicon. Key features include 4 MHz operating frequency, 12-bit wide instruction words, an 8-bit data path, a programmable watchdog timer, power-on reset, and a programmable code-protection bit. The OTP (One-Time Programmable) EPROM cell technology allows the firmware to be written once and locked permanently, which simplifies production programming and protects intellectual property. I/O current sourcing and sinking capabilities are sufficient to drive LEDs and small relays directly without external buffers in many designs. The PIC16C55A-04E architecture uses a Harvard-style separate program and data bus, single-cycle instruction fetch with two-stage pipelining, and a 2-level hardware stack that limits subroutine nesting depth. Compared with PIC16 enhanced cores, this baseline family lacks interrupts, so all real-time servicing must be performed via polled software loops - a key trade-off that benefits cost-sensitive applications where deterministic polling is acceptable. The 'E' suffix indicates the extended temperature grade (typically -40C to +125C), and 'P' designates the PDIP-28 package with through-hole leads. Typical applications include automotive body controllers, industrial appliance control, simple sensor interfaces, LED driver controllers, and replacement of discrete logic in legacy equipment. The wide operating temperature range supports under-hood automotive modules and outdoor industrial enclosures where commercial-grade parts would fail. When designing with this part, observe the maximum clock-versus-voltage constraint: at 5V VDD the device operates up to 4 MHz, while at lower supply voltages the maximum frequency decreases proportionally. Decouple VDD with a 0.1 uF ceramic capacitor placed close to the pin, and reserve the MCLR pin for a proper reset network unless it is disabled in configuration. This page synthesizes distributor pricing, cross-reference alternatives, and practical engineering notes that complement the manufacturer datasheet.

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PIC16C55A-04E/SP

PIC16C55A-04E/SP - 4MHz 8-Bit OTP MCU 768B | Microchip

The Microchip Technology PIC16C55A-04E/SP is an 8-bit RISC microcontroller belonging to the PIC16C5X baseline family, housed in a 28-pin SPDIP (SP) package. It operates at up to 4 MHz clock speed, delivers 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, 25 bytes of RAM, and 20 general-purpose digital I/O pins. The device supports the industry-standard 12-bit instruction word used across the PIC16C5X family, achieving a 2:1 code compression advantage over competitive 8-bit MCUs in its class. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, I/O peripherals, and often analog blocks into one package. The PIC16C5X belongs to the RISC (Reduced Instruction Set Computer) architecture lineage, designed for deterministic execution and low parts count in embedded designs. Within the broader taxonomy, this part sits as: microcontroller -> embedded controller -> semiconductor IC -> integrated circuit. Its baseline (12-bit instruction) architecture distinguishes it from mid-range (14-bit) and enhanced (16-bit) PIC families. Key features of the PIC16C55A include a 4 MHz maximum oscillator frequency, 2.0V to 6.25V operating voltage range (suitable for both 3.3V and 5V rails as noted in distributor datasheets), 20 digital I/O pins, a watchdog timer for code-flow safety, and an internal reset circuit. The 28-SPDIP package is the original through-hole form factor preferred for prototyping, hobbyist designs, and legacy industrial controllers where socketed or hand-soldered assembly remains common. Technically, the PIC16C55A uses a Harvard architecture with separated program and data paths, two-stack-level subroutine nesting, and a hardware-friendly instruction set optimized for C and assembly code density. The OTP memory supports one-time field programming for production volumes, with the -04E speed designation indicating the 4 MHz extended temperature grade suitable for industrial environments. Typical applications include legacy industrial control, appliance controllers, simple sensor interfaces, hobbyist and educational projects, and replacement of older discrete logic glue circuits. The wide voltage tolerance and deterministic interrupt handling also make it attractive for cost-sensitive automotive subsystems and standalone sensor readers. When designing with the PIC16C55A, remember that OTP memory cannot be rewritten, so code must be fully verified before final programming. The 28-SPDIP footprint is compatible with standard IC sockets and breadboards, simplifying field service and rapid iteration. For new designs consider PIC16F equivalents for Flash-based reprogrammability. This page synthesizes verified distributor pricing, parametric comparison tables, and same-package drop-in alternatives not found in the bare manufacturer datasheet, plus practical engineering notes for engineers evaluating the PIC16C55A-04E/SP.

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PIC16C55A-04E/SS

PIC16C55A-04E/SS - 8-Bit 4MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C55A-04E/SS is an 8-bit PIC® 16C-family microcontroller built on a fully-static CMOS process with One-Time Programmable (OTP) EPROM program memory, delivering 4 MHz maximum operating frequency, 768 bytes (512 x 12 words) of OTP program memory, and 24 bytes of RAM, housed in a 28-pin SSOP (Shrink Small Outline Package). It is part of the original PIC16C5X baseline architecture employing a RISC instruction set with 33 single-word/single-cycle instructions, two-level hardware stack, and direct/indirect/relative addressing modes. An 8-bit OTP microcontroller is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and peripherals into one package; the program memory can be written exactly once (One-Time Programmable), making these devices economical for low-to-medium-volume production. Within the broader taxonomy, the PIC16C55A sits at the bottom of the PIC16 family hierarchy: microcontroller -> 8-bit MCU -> PIC16 -> PIC16C5X baseline -> PIC16C55A. This hierarchy places it below PIC16C6X mid-range and PIC16C7X enhanced devices, and well below modern 16-bit dsPIC and 32-bit PIC32 offerings, but it remains a cost-effective solution for simple control tasks. Key features of the PIC16C55A-04E/SS include a 4 MHz operating frequency (4 MHz speed grade, denoted by the -04 suffix), 20 digital I/O pins organized across PORTA and PORTB, an 8-bit real-time clock/counter (TMR0) with 8-bit prescaler, watchdog timer with dedicated on-chip RC oscillator for reliable operation, power-on reset, power-saving SLEEP mode, and EPROM/ROM-based code storage. The device operates across the standard PIC16C5X voltage range and supports commercial and industrial temperature grades depending on the part suffix. The architecture uses a Harvard-style separate program and data bus, allowing instruction fetch and operand read to occur in the same cycle - a key reason the PIC16C5X delivers close to 1 MIPS per MHz. The 12-bit wide instruction word gives 2:1 code compression over typical 8-bit CISC microcontrollers of its class, enabling 512 instruction words to address relatively complex control sequences despite the small 768-byte program memory budget. Typical applications include low-cost appliance control, LED lighting controllers, simple sensor interfaces, battery chargers, remote control transmitters, automotive body controllers (with proper AEC-Q100 selection), and hobbyist/educational development platforms. The 20 I/O count makes it suitable for designs requiring multiple switches, relays, or LED indicators. When designing with the PIC16C55A-04E/SS, note that OTP memory cannot be erased or rewritten - use PIC16F55X or PIC16C55A JW-windowed parts for prototyping. Decoupling VDD with a 0.1 uF ceramic capacitor close to the pin is mandatory for stable oscillator operation; the MCLR pin must be tied to VDD through a resistor for normal operation. This page synthesizes distributor pricing for the PIC16C55A-04E/SS, current lifecycle status from Microchip, same-family drop-in alternatives including -04 and -04I speed/temperature variants, and practical design notes not found in the manufacturer datasheet.

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PIC16C55A-04I/P

PIC16C55A-04I/P - 4MHz 8-Bit OTP MCU, 768B, 28-PDIP | Microchip

The Microchip Technology PIC16C55A-04I/P is an 8-bit RISC microcontroller from the PIC16C5x family, featuring a 4 MHz maximum clock speed, 768 bytes of One-Time Programmable (OTP) program memory organized as 512 x 12 words, 24 bytes of RAM, and a 12-bit instruction word in a 28-pin PDIP through-hole package with industrial temperature grade (-40C to +85C). An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral I/O on one die. In the component taxonomy, an MCU belongs to the broader class of microcontrollers -> embedded processors -> digital ICs -> semiconductors. The PIC16C5x family pioneered Microchip's RISC architecture for low-cost, high-volume embedded control, and it is the direct ancestor of today's PIC16 and PIC18 families. Key features of the PIC16C55A-04I/P include 33 single-word single-cycle RISC instructions providing 2:1 code compression over CISC 8-bit MCUs of its era, a two-level deep hardware stack, an 8-bit real-time counter (TMR0) with an 8-bit programmable prescaler, direct/indirect/relative addressing, and seven or eight special function hardware registers. The OTP program memory allows one-time factory or field programming, making the part well suited to mature production runs where firmware is fixed. Architecturally, the device uses a Harvard-style separated program/data bus, 12-bit instruction width, and CMOS process technology for low power. It runs from a single 3.0V to 6.25V supply (commercial/industrial variants) at up to 4 MHz, producing 1 MIPS throughput. The 8-bit data path with 12-bit opcodes yields compact code density that fits easily within the 512-word OTP space. Typical applications include appliance controls, low-end consumer products, simple sensor interfaces, battery chargers, LED drivers, and industrial timers where a small, inexpensive, deterministic 8-bit core is preferred over a 16-/32-bit MCU. The industrial temperature grade extends deployment into factory and outdoor equipment. When designing with this part, choose an external 4 MHz crystal or resonator for clock accuracy, drive MCLR with a proper reset circuit, and reserve RA0-RA3 digital I/O pins carefully because some packages multiplex analog functions onto them. The OTP memory cannot be erased, so use a PIC16F55 flash equivalent for prototyping.

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PIC16C55A-04I/SO

PIC16C55A-04I/SO - 8-Bit OTP MCU, 4MHz, 768B | Microchip

The Microchip Technology PIC16C55A-04I/SO is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, operating at 4 MHz with 768 bytes of One-Time-Programmable (OTP) program memory (512 x 12) and 24 bytes of RAM, housed in a 28-pin SOIC package. This industrial-temperature (-40C to +85C) device delivers 20 digital I/O pins, a two-level hardware stack, and a single 8-bit timer/counter (TMR0) with watchdog capability. An OTP microcontroller (One-Time-Programmable MCU) is a microcontroller whose program memory is implemented as one-time-writable EPROM rather than flash. OTP MCUs occupy the middle ground between mask-ROM parts (lowest cost at high volume, but cannot be programmed in the field) and flash-based MCUs (re-programmable, higher cost per bit). OTP is widely used in cost-sensitive, high-volume consumer and industrial products where the firmware is finalized before production and field updates are not required. Within the broader taxonomy, PIC16C55A is a microcontroller -> 8-bit MCU -> RISC MCU -> CMOS MCU -> semiconductor. Key specifications include 12-bit wide instructions for 2:1 code compression versus other 8-bit MCUs, direct/indirect/relative addressing modes, 33 instruction set, and compatibility with the PIC16C5X baseline. The device runs from 3.0V to 6.0V, supports in-circuit serial programming (ICSP) via the PICmicro mid-range family convention, and is well-suited for high-volume embedded designs that have moved beyond prototyping. Its 4 MHz clock delivers up to 1 MIPS of throughput, sufficient for simple control loops and user-interface tasks. Architecturally, the PIC16C55A employs a Harvard-style RISC core with separate program and data buses, allowing instruction fetch and operand read to occur in a single cycle except for branches. The OTP array is organized as 512 x 12, and the data memory is structured as 24 general-purpose registers plus special-function registers mapped into a common file. Reset is provided by power-on, MCLR, and watchdog expiry, with brown-out detection unavailable on this baseline part. Typical applications include appliance control (washing machines, microwave user-interface boards), battery chargers, LED drivers, simple sensor signal conditioning, low-end remote controls, and replacement of discrete logic. Designers choose this part when absolute lowest unit cost matters more than field re-programmability and the code footprint fits within 768 bytes. For new designs, prefer PIC16F54 (flash, pin-compatible drop-in upgrade) or PIC16C558 (more memory, same 28-SOIC footprint). Designers should note that this part is in Microchip's NRND lifecycle - order lifetime-buy quantities if your product must ship beyond the last-time-buy cutoff. This page synthesizes distributor pricing, pin-compatible PIC16C5X alternatives, and practical migration guidance to PIC16F54 flash parts not found in any single datasheet or distributor listing.

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PIC16C55A-04I/SS

PIC16C55A-04I/SS - 4MHz 8-bit OTP MCU, 20 I/O, SSOP-28 | Microchip

The Microchip Technology PIC16C55A-04I/SS is a low-cost, high-performance 8-bit fully-static CMOS microcontroller from the PIC16C5X family, delivering 4 MHz maximum clock speed with 768 bytes (512 x 12) of One-Time-Programmable (OTP) EPROM program memory in a 28-pin SSOP (Shrink Small Outline Package). The device exposes 20 bidirectional digital I/O pins, 24 bytes of RAM, and a single 8-bit Timer0 with an 8-bit prescaler for real-time event counting. The 'I' suffix denotes the industrial operating temperature range of -40C to +85C, while '04' specifies the 4 MHz maximum oscillator frequency, and 'SS' indicates the SSOP-28 surface-mount package. What is a microcontroller? A microcontroller (MCU) is a single-chip computer containing a CPU, non-volatile program memory, working RAM, configurable I/O peripherals, and one or more timers on one piece of silicon. Within the broader taxonomy, an MCU is a sub-category of integrated circuit -> microprocessor -> semiconductor. The PIC16C5X family is positioned as an entry-level 8-bit RISC MCU optimized for cost-sensitive, low-pin-count embedded control, where its compact 33-instruction instruction set and 12-bit-wide opcode enable 2:1 code compression versus typical 8-bit CISC competitors in the same price class. Key features of the PIC16C55A include only 33 single-word/single-cycle instructions (most execute in 200 ns at 20 MHz oscillator, equivalent to a 4 MHz instruction rate for the -04 speed grade), a 2-level hardware call stack, direct/indirect/relative addressing modes for both data and instructions, and seven or eight special-function hardware registers. An 8-bit real-time clock/counter (TMR0) with user-programmable prescaler supports timing, event-counting, and pulse-width measurement. The on-chip watchdog timer (WDT) with its own on-chip RC oscillator enables autonomous recovery from code-flow faults without external components, which is critical for unattended industrial installations. Power-saving SLEEP mode reduces I_DD to a few microamps for battery-operated applications, and the device operates across 2.5 V to 6.25 V V_DD. Architecturally, the PIC16C55A employs a Harvard-style RISC core with separate program and data paths, providing deterministic instruction throughput and immunity to data-bus contention. The OTP EPROM is windowless and one-time-programmable, giving the device its 'C' (CMOS/OTP) designation; for windowed UV-erasable prototypes, the JW ceramic package variant exists. The 12-bit instruction word delivers strong code density, and the all-static design permits the oscillator to be stopped without losing internal register state - a useful trait for low-power designs. Typical applications include appliance controls, automotive body electronics, low-end security panels, simple sensor signal conditioning, fan and pump controllers, and any high-volume embedded product where cost, small footprint, and proven PIC ecosystem tooling outweigh the need for modern peripherals like USB or CAN. Because the part is marked 'Not Recommended for new designs' by Microchip, it is best reserved for maintenance of installed equipment. When designing with the PIC16C55A, note that the 4 MHz speed grade limits computational throughput; verify instruction-cycle margins at your maximum external event rate. Decoupling V_DD with a 0.1 uF ceramic capacitor placed within 5 mm of the supply pin, plus a 10 uF bulk reservoir at the regulator output, is essential for clean POR behavior on industrial supply rails. This page consolidates current distributor pricing, parametric drop-in alternatives, and engineering design notes not typically aggregated on a single datasheet - giving maintenance and sourcing engineers a one-stop reference for legacy PIC16C55A inventory decisions.

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PIC16C55A-20/SO

PIC16C55A-20/SO - 8-Bit 20MHz OTP MCU 768B 28-SOIC | Microchip

The Microchip Technology PIC16C55A-20/SO is an 8-bit RISC CMOS microcontroller belonging to the PIC16C5X family, delivering 20 MHz maximum clock speed with 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory in a 28-pin SOIC surface-mount package. The device exposes 20 digital I/O pins, integrates 24 bytes of general-purpose RAM, and provides 12-bit-wide instruction words with single-cycle execution across 33 instruction opcodes for compact code density. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path and a Harvard or modified-Harvard architecture. Within the broader hierarchy, MCUs sit inside the microcontrollers category, which itself belongs to integrated circuits, semiconductor devices, and finally electronic components. The PIC16C5X family specifically represents Microchip's lowest-cost OTP/EPROM-based controllers targeted at high-volume, cost-sensitive embedded designs where re-programmability is not required after deployment. Key features include an 8-bit timer/counter (TMR0) with programmable prescaler, two-level hardware stack, support for direct, indirect and relative addressing modes, and a wide 2.0V to 6.0V operating voltage range. The fully static CMOS design allows the clock to be stopped without losing register contents, and the RISC architecture achieves 2:1 code compression versus typical 8-bit CISC competitors in the same price class. On the technical depth side, the PIC16C55A-20/SO implements a two-stage pipeline, executes one instruction per clock cycle (except branches), and offers seven or eight special-function hardware registers mapped into its data memory. The 20 MHz oscillator version provides approximately 5 MIPS throughput, which is ample for appliance control, simple sensor interfaces, and low-cost user-interface glue logic. Typical applications include consumer appliance controllers, LED display drivers, low-end remote controls, battery chargers, security keypads, and educational/hobbyist platforms. Because the program memory is OTP, designers must commit firmware before final assembly, making the part best suited to mature, stable code bases. When designing with this device, allocate sufficient decoupling (0.1 uF ceramic near VDD) and respect the 20 MHz maximum oscillator limit with appropriate crystal loading capacitance. The 28-SOIC package supports hand-soldering but is also fully compatible with automated pick-and-place assembly for production runs. This page consolidates current distributor pricing, same-package drop-in alternatives from the Microchip PIC16C5X family and cross-brand equivalents, application design notes, and a parameter comparison table not available on any single manufacturer or distributor page.

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PIC16C55A-20/SP

PIC16C55A-20/SP - 8-Bit 20MHz OTP MCU, 20 I/O, SPDIP-28 | Microchip

Microchip Technology PIC16C55A-20/SP is an 8-bit RISC microcontroller in the PIC16C5X baseline family, supplied in a 28-pin SPDIP (Skinny Plastic DIP) package. It integrates 768 bytes of one-time-programmable (OTP) program memory (organized as 512 x 12 words), 24 bytes of RAM, and runs the PIC16 instruction set at up to 20 MHz clock rate with 200 ns instruction cycle. The device provides 20 general-purpose digital I/O pins arranged across ports RA and RB, two 8-bit timer/counters (TMR0 and TMR1) plus a watchdog timer, and a two-level hardware stack for subroutine nesting. A baseline PIC microcontroller is an 8-bit CMOS MCU that executes a compact 12-bit-wide instruction set optimized for low-cost embedded control. It belongs to the hierarchy: PIC16C5X -> PIC16 family -> 8-bit microcontroller -> microcontroller -> embedded processor -> semiconductor. Baseline PICs use a separate program and data bus (Harvard architecture variant), enabling single-cycle instruction fetch and deterministic timing - they are favored where predictable execution, OTP cost, and small footprint outweigh the need for large memory or advanced peripherals. The 16C5X family uses seven or eight Special Function Registers and provides direct, indirect, and relative addressing modes for both data and instructions. Key features include an 8-bit real-time clock/counter (TMR0) with programmable prescaler, a Watchdog Timer (WDT) with its own on-chip RC oscillator for reliable recovery, on-chip power-on reset (POR), and brown-out detection. Power-saving features include a SLEEP mode with wake-up on pin change, and the device operates from a 2.5 V to 5.5 V supply. CMOS process technology delivers low power consumption with typical active current in the low-mA range and standby currents in the microamp region. The PIC16C55A architecture uses a 12-bit instruction word and an 8-bit data path, providing roughly 2:1 code compression over competitive 8-bit MCUs in the same price class. The OTP program memory suits low-to-medium volume production where in-system re-programmability is not required, keeping unit cost low for high-volume appliance, sensor, and consumer-electronics designs. Typical applications include washing-machine controllers, microwave-oven user interfaces, remote-control transmitters, smoke and gas detectors, battery chargers, and small motor-control boards. Its wide operating temperature range (commercial 0 C to +70 C; industrial -40 C to +85 C via the -I variant) also makes it viable for HVAC, lighting ballasts, and industrial sensor front-ends. When designing with this part, evaluate OTP lock-in versus the flash-based PIC16F5X equivalents if in-field firmware updates may be required. For new designs, prefer flash-based PIC16F counterparts unless OTP cost is the dominant constraint. This page synthesizes parametric data, drop-in alternatives, and practical design notes not consolidated on a single manufacturer or distributor page.

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PIC16C55A-20E/P

PIC16C55A-20E/P - 8-Bit 20MHz OTP MCU, 768B, 28-PDIP | Microchip

The Microchip Technology PIC16C55A-20E/P is an 8-bit RISC microcontroller from the PIC® 16C family, operating at up to 20 MHz clock speed with 768 bytes (512 x 12) of OTP program memory and 25 bytes of RAM, housed in a 28-pin PDIP through-hole package. It offers 20 general-purpose I/O pins, automotive temperature grade (-40C to +125C), and an operating voltage range of 3.0V to 6.0V typical. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and programmable I/O peripherals. The PIC16C5X family is positioned at the entry level of the 8-bit RISC MCU taxonomy: PIC16C5X -> PIC16C family -> PIC microcontrollers -> 8-bit microcontrollers -> microcontrollers -> embedded ICs. The 12-bit wide instruction set provides 2:1 code compression over competing 8-bit MCUs, allowing more functionality in fewer bytes of program memory. Key features include a 33-instruction set, 12-bit wide instructions, 2:1 code compression versus competitors, 8-bit data path, 20 MHz maximum clock frequency, and one-time programmable (OTP) program memory. The 28-pin PDIP package provides breadboard-friendly through-hole mounting suitable for prototyping, education, and legacy industrial systems. Architecturally, the PIC16C55A uses a Harvard-architecture RISC core with separate program and data buses. The OTP memory is programmed once and cannot be erased, making the device well-suited to high-volume, cost-sensitive applications where firmware is finalized at production. The automotive temperature grade extends operating range to -40C to +125C, distinguishing the 'E' suffix from commercial-grade variants. Typical applications include automotive embedded controllers, legacy industrial control systems, appliance control boards, prototyping platforms, educational development boards, and cost-sensitive replacement designs. The 28-pin PDIP form factor remains popular for through-hole manufacturing lines and hobbyist development. When designing with this device, note that OTP memory cannot be field-updated - any firmware bug requires physical IC replacement. Use the parallel programming mode and a Microchip-approved device programmer (such as the MPLAB PM3) for production programming. This page synthesizes distributor pricing from DigiKey/Mouser, automotive-grade drop-in alternatives in the same 28-PDIP footprint, and practical design notes not found in the manufacturer datasheet.

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PIC16C55A-20E/SO

PIC16C55A-20E/SO - 20MHz 8-Bit OTP MCU | Microchip | 28-SOIC

The Microchip Technology PIC16C55A-20E/SO is a 20 MHz, 8-bit, fully static, EPROM/OTP-based CMOS microcontroller in the PIC16C5X family, housed in a 28-pin SOIC (SO) 0.295-inch/7.50 mm wide surface-mount package. The "-20E" suffix denotes the 20 MHz maximum clock speed and the extended (-40C to +125C) operating temperature grade. It integrates 768 bytes of EPROM/OTP program memory (organized as 512 x 12 words), 24 bytes of general-purpose SRAM, 12-bit instruction word architecture, and 20 digital I/O pins arranged across four ports (RA, RB, RC, RD). A microcontroller (MCU) is a single-chip computer that combines a CPU core, program memory, working RAM, and configurable I/O peripherals on one IC. The PIC16C5X family occupies the entry-level, cost-optimized branch of Microchip's 8-bit PIC portfolio, descending from the broader class of 8-bit microcontrollers -> microcontrollers -> embedded processors -> semiconductors. It uses a RISC instruction set with 33 single-cycle instructions, has no onboard peripherals beyond the core I/O and timer, and is intended for high-volume cost-sensitive applications where OTP programmability is acceptable. Key features of the PIC16C55A-20E/SO include 768 bytes of OTP program memory, 24 bytes of RAM, four I/O ports (PORTB 8-bit, PORTC 8-bit, PORTD 4-bit plus RA 4-bit variant), a 20 MHz maximum oscillator frequency, and a wide 3.0 V to 5.5 V supply range. The 20 MHz clock enables a 200 ns instruction cycle at full speed; instructions are 12 bits wide, providing compact code density. The device uses an external oscillator and supports crystal, ceramic resonator, or RC clock inputs. Architecturally, the PIC16C55A uses a Harvard RISC core with separate program and data paths, a 12-bit instruction word, and a 2-level hardware stack. Its reset and watchdog timing characteristics are defined in the manufacturer datasheet. There is no integrated UART, ADC, or interrupt controller beyond the basic external/port-change interrupt on PORTB, making this part one of the simplest members of the PIC16C5X family and the closest sibling of the PIC16C54A and PIC16C57C. Typical applications for the PIC16C55A-20E/SO include low-cost consumer appliances, simple motor controllers, LED display drivers, automotive body controllers (using the -E temperature grade), battery chargers, remote-control transmitters, and any high-volume embedded design that requires OTP one-time programmable memory rather than flash. The PIC16C5X is often selected where field upgrades are unnecessary and unit cost is the primary driver. When designing with this device, note that OTP memory cannot be rewritten in-circuit, so the firmware must be fully verified on EPROM-windowed samples (PIC16C55A-20/JW) before committing to OTP production. The lack of an internal oscillator means an external clock source must always be supplied, and the wide 0.295-inch SO body requires careful clearances in compact layouts. This page synthesizes distributor pricing, drop-in OTP/EPROM and FLASH alternatives, and practical design notes not found in the standalone manufacturer datasheet.

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PIC16C55A-20E/SP

PIC16C55A-20E/SP - 8-Bit 20MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C55A-20E/SP is an 8-bit RISC microcontroller from the PIC16C5X family operating at up to 20 MHz, with 768 bytes (512 x 12-bit words) of One-Time Programmable (OTP) program memory, 25 bytes of RAM, and packaged in a 28-pin SPDIP (SP) through-hole DIP. The "E" suffix denotes the extended industrial temperature grade of -40C to +125C, while the trailing /SP indicates the SPDIP-28 plastic dual-in-line package. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and peripheral interfaces into one package. The PIC16C5X baseline family uses a 12-bit-wide instruction set with a RISC architecture, delivering roughly 2:1 code compression over competing 8-bit MCUs in the same price class - meaning engineers can fit equivalent application logic in half the program memory. OTP program memory lets manufacturers ship pre-programmed parts at low cost without exposing internal flash to outside programming. Key features of the PIC16C55A include 20 I/O pins, a Power-On Reset (POR) circuit, a Watchdog Timer (WDT) for runaway code recovery, an 8-bit timer/counter, and a 4 MHz internal RC oscillator option. The device operates across 3.0V to 6.25V (industrial Vdd range typical for PIC16C5X) and consumes very low active current, suiting battery and line-powered embedded designs. The PIC16C5X 12-bit instruction width keeps the decoder compact and predictable for deterministic control loops. Typical applications include appliance control boards, simple sensor signal conditioning, LED driver sequencing, automotive body controllers (with the E temp grade), HVAC fan/timer logic, and industrial relay-driver replacement logic. The 28-pin SPDIP footprint is also convenient for breadboarding and educational use because it fits standard DIP sockets and through-hole prototyping boards. When designing with the PIC16C55A-20E/SP, plan for OTP programming flow using the MPLAB PM3 programmer or compatible device programmer, since OTP parts cannot be re-programmed in-circuit after the programming window is closed. Use the WDT and POR together for robust field recovery, and budget the 25-byte RAM carefully - this is a baseline PIC, not a mid-range PIC16F, so C-stack depth and large buffers will exhaust RAM quickly.

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PIC16C55A-20E/SP - 8-Bit 20MHz OTP MCU 768B | Microchip