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PIC16C554/JW - 8-Bit 20MHz CMOS EPROM MCU 18-CERDIP | Microchip
PIC16C554/JW

PIC16C554/JW - 8-Bit 20MHz CMOS EPROM MCU 18-CERDIP | Microchip

The Microchip Technology PIC16C554/JW is an 8-bit RISC CMOS microcontroller based on EPROM program memory, delivering 20MHz (200ns instruction execution) performance in an 18-pin CERDIP windowed package for in-circuit reprogrammability via UV erasure. It integrates 896 bytes of EPROM program memory (512 x 14 wide), 80 bytes of data RAM, and 13 digital I/O pins, providing a compact solution for embedded control. An EPROM-based 8-bit microcontroller is a class of programmable logic device that stores firmware in non-volatile erasable programmable read-only memory, allowing engineers to repeatedly erase and reprogram the device during development using a UV eraser through a transparent quartz window in the package. This category sits hierarchically under microcontroller -> embedded processor -> semiconductor IC, and was popular in the 1990s before being superseded by flash-based MCUs that offer in-circuit serial programming without UV erasure. Key features include 35 single-word instructions, a Power-On Reset (POR) generator, a Watchdog Timer (WDT) for reliable operation in electrically noisy environments, and an internal oscillator option. The 18-CERDIP (0.300 inch, 7.62mm) through-hole package with quartz window supports both commercial (0C to +70C) and industrial temperature grades, with /J suffix denoting the CERDIP windowed variant. The PIC16C554 uses Microchip's PIC RISC architecture with a 14-bit instruction word and Harvard bus structure, separating program and data memory for deterministic single-cycle execution. The 20MHz clock rate delivers 200ns instruction cycle time, suitable for real-time control loops and basic peripheral interfacing. EPROM storage supports engineering prototypes and low-volume production where code iteration is required. Typical applications include industrial automation controllers, automotive body electronics, appliance control boards, sensor signal preprocessing, and legacy embedded systems requiring UV-reprogrammable firmware. The CERDIP windowed package is particularly suited for development, debugging, and field-upgradable equipment. When designing with this part, note that the JW suffix denotes a windowed CERDIP package only - for production, consider the PIC16C554-04/P or PIC16F554-I/P flash-based equivalents in plastic packages. Ensure the oscillator configuration matches your clock source and that the Watchdog Timer is properly serviced in firmware to avoid unintended resets. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.

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PIC16C554T-04/SO - 4MHz 8-bit OTP MCU 13 I/O | Microchip
PIC16C554T-04/SO

PIC16C554T-04/SO - 4MHz 8-bit OTP MCU 13 I/O | Microchip

The Microchip Technology PIC16C554T-04/SO is a CMOS OTP-based 8-bit microcontroller built on the PIC16 architecture, delivering 4MHz (200 ns instruction cycle) performance in an 18-pin SOIC surface-mount package. It integrates 896 bytes of EPROM program memory (512 x 14), 80 bytes of RAM, and 13 digital I/O pins, providing a low-cost, easy-to-program solution for embedded control. What is an 8-bit OTP microcontroller? An 8-bit OTP (One-Time Programmable) microcontroller is a single-chip computer that executes 8-bit-wide instructions and stores its program memory in PROM cells that can be written exactly once. The PIC16C554 belongs to the broader category of microcontrollers -> 8-bit MCUs -> PIC16 family -> CMOS OTP mid-range devices. Its 35 single-word RISC instruction set simplifies code generation and reduces development time versus complex CISC architectures, while its OTP memory reduces unit cost compared to flash or EEPROM-based MCUs in volume production. Key features include a 4MHz maximum operating frequency, 2.0V to 6.0V operating voltage range (3.3V/5V typical), 13 I/O pins with individual direction control, a watchdog timer, power-on reset, brown-out detection, and an 8-bit timer/counter. The 18-SOIC package is industry-standard and easily hand-solderable, making this part suitable for prototype and small-to-medium volume production runs. The PIC16C554 uses Microchip's proven PIC RISC engine with a 14-bit instruction word and Harvard architecture (separate program and data buses). This two-bus design lets the CPU fetch instructions while reading/writing data in the same cycle, yielding deterministic interrupt latency and predictable timing for real-time control tasks. Typical applications include simple appliance controllers, sensor interface front-ends, LED drivers and lighting control, automotive body electronics (in extended-temperature variants), battery chargers, and low-cost consumer products. The small footprint and minimal external component count (no crystal required when using internal RC) further reduce BOM cost. When designing with this device, note that OTP memory cannot be reprogrammed - firmware bugs require board rework or replacement. Choose a flash-based PIC16F-series equivalent for development and field-upgradable designs, and use the PIC16C554 for cost-optimized production units where firmware is finalized. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet.

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PIC16C554T-04/SS - 8-Bit OTP MCU, 896B EPROM, 20-SSOP | Microchip
PIC16C554T-04/SS

PIC16C554T-04/SS - 8-Bit OTP MCU, 896B EPROM, 20-SSOP | Microchip

The Microchip Technology PIC16C554T-04/SS is a 4 MHz, 8-bit CMOS RISC microcontroller built on the PIC16 family core, packaged in a 20-pin SSOP (SS) form factor and supplied on tape-and-reel. It integrates 896 bytes of OTP program memory (organized as 512 × 14) and 80 bytes of data RAM, with 13 general-purpose digital I/O pins. The device operates from a single 3.0 V to 5.5 V supply and is qualified for the commercial 0 °C to +70 °C temperature grade. A microcontroller (MCU) is a single-chip computer that combines a CPU core, program memory (ROM/Flash/OTP), working RAM, and peripheral interfaces on one silicon die. Within the broader taxonomy, an MCU is a sub-class of microprocessor ICs and a member of the embedded computing family. The PIC16C5xx family, introduced in the early 1990s, uses a 12-bit instruction word RISC core and remains popular for cost-sensitive, deterministic, low-power embedded applications where modern Cortex-M-class parts would be overkill. Key features of the PIC16C554T-04/SS include a 4 MHz maximum oscillator input with a 200 ns instruction cycle, an 8-bit timer/counter, a watchdog timer (WDT) with on-chip RC oscillator, power-on reset (POR), and power-saving SLEEP mode. The instruction set comprises 33 single-word, single-cycle instructions, and the device supports external oscillator operation with configurable clock modes. Architecturally, the part uses a Harvard memory layout with separate program and data buses, a two-stage pipeline, and a fixed 8-level hardware stack. Its ultra-compact OTP memory suits low-volume production, prototyping, and legacy design maintenance where code updates are infrequent. Typical applications include appliance control, sensor interface modules, LED drivers, remote controls, low-end security keypads, and simple motor-control user interfaces. The PIC16C554 family is well suited when a small, proven, deterministic controller is preferred over a larger Flash MCU. Designers should note that the 'T' suffix indicates tape-and-reel packaging, and the 896-byte OTP memory cannot be electrically erased — verified firmware is required before programming.

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PIC16C554T-04E/SO - 8-Bit OTP MCU, 4MHz, 13 I/O, 18-SOIC
PIC16C554T-04E/SO

PIC16C554T-04E/SO - 8-Bit OTP MCU, 4MHz, 13 I/O, 18-SOIC

The Microchip Technology PIC16C554T-04E/SO is an 8-bit PIC16C-series microcontroller featuring a 4 MHz CPU core, 896 bytes (512 x 14) of One-Time Programmable (OTP) program memory, 80 bytes of RAM, and 13 general-purpose I/O pins. It is housed in an 18-pin SOIC package with 7.50 mm body width and is supplied in Tape & Reel (TR) packaging. The device operates from 3V to 5.5V across an extended industrial temperature range of -40C to +125C. An 8-bit microcontroller (MCU) is a small computer-on-a-chip that integrates a CPU, RAM, non-volatile program memory (ROM/EPROM/OTP/Flash), I/O peripherals and timers into a single package. The PIC16C5xx family belongs to the classic baseline PIC architecture, which sits within the broader hierarchy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. These devices are favored for low-cost, deterministic, interrupt-driven control tasks in cost-sensitive designs. Key features of the PIC16C554T-04E/SO include a 4 MHz maximum operating frequency, a 12-bit instruction word with a RISC-style instruction set, an 8-bit-wide data path, and a Watchdog Timer for reliable operation in noisy environments. The 13 I/O pins can source/sink sufficient current to directly drive LEDs and small relays. The OTP memory allows one-time programming at production time, lowering unit cost versus windowed or Flash parts. Architecturally, the PIC16C554T-04E/SO uses a Harvard architecture with separate program and data buses, allowing instruction fetch and operand read to occur in a single cycle. The 4 MHz oscillator with a 4:1 internal divider yields a 1 MHz instruction cycle, providing deterministic 1 us instruction timing for time-critical control loops. The reduced instruction set and accumulator-based ALU simplify code generation and verification. Typical applications include appliance control (white goods, coffee machines, washing machines), simple sensor interfacing, LED drivers, low-end consumer electronics, and industrial control subsystems where cost dominates over memory size or peripheral richness. The 13 I/O and built-in Watchdog Timer also make it a common choice for safety-critical or unattended embedded systems that require self-recovery from firmware faults. When designing with this device, note that the 'E' suffix denotes the Extended (-40C to +125C) operating temperature range and the 'T' suffix denotes Tape & Reel packaging; the '04' denotes 4 MHz CPU clock. For prototype builds consider the windowed PIC16C554JW for code iteration, or migrate to PIC16F554 (Flash) if field reprogrammability is required. This page synthesizes distributor pricing, parametric cross-references and design guidance not consolidated on any single manufacturer or distributor page.

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PIC16C554T-04E/SS - 8-bit 4MHz OTP MCU 20-SSOP | Microchip
PIC16C554T-04E/SS

PIC16C554T-04E/SS - 8-bit 4MHz OTP MCU 20-SSOP | Microchip

The Microchip Technology PIC16C554T-04E/SS is an 8-bit PIC16 family microcontroller (MCU) featuring a 4 MHz instruction execution rate, 896 bytes of OTP (one-time programmable) program memory organized as 512 x 14 bits, 80 bytes of RAM, and 13 general-purpose I/O pins in a 20-pin SSOP package. The "T" suffix denotes tape-and-reel packaging, "04" indicates the 4 MHz speed grade, "E" marks the extended temperature operating range, and "/SS" specifies the 20-SSOP surface-mount package. The device executes a single instruction cycle in 200 ns and supports a 35-instruction set optimized for embedded control. Operating voltage is 3.0 V to 5.5 V (per the OTP-based PIC16C55x family datasheet). An 8-bit OTP microcontroller is a CMOS microcomputer with non-volatile program memory that can be written exactly once using an external programmer, then retains the code indefinitely. OTP MCUs sit between masked-ROM devices (lowest unit cost at high volume) and flash-based MCUs (re-programmable but more expensive per bit). The PIC16C architecture belongs to the larger PIC family hierarchy: PIC16C -> PIC16 family -> PICmicro 8-bit -> microcontroller -> embedded processor -> semiconductor. This hierarchy places the part firmly in the industrial/commercial control domain where deterministic timing, low cost, and one-time-programmed code storage are required. Key features include 13 digital I/O pins, an 8-bit timer/counter, watchdog timer for reliable operation, power-on reset, brown-out detection (per family datasheet), and an internal oscillator option (per family datasheet). The PIC16C554 also supports in-circuit serial programming via the ICSP interface. Compared to flash-based PIC16F devices, OTP variants deliver lower per-unit cost once programmed, making them suitable for high-volume sealed products. Typical applications include automotive body controllers, industrial sensor interfaces, consumer appliance control boards, security peripherals, and any cost-sensitive embedded system where code is finalized before production. The extended -40 C to +125 C temperature range ("E" suffix) makes it suitable for harsh-environment applications. When designing with the PIC16C554T-04E/SS, engineers must program the OTP memory before final PCB assembly because OTP cannot be erased or rewritten. For prototyping or field-upgradable designs, choose a flash-based PIC16F equivalent. Verify programming tool compatibility with PIC16C OTP devices; not all modern PIC programmers support legacy OTP parts. The "T" suffix denotes tape-and-reel so the device is suitable for automated pick-and-place assembly.

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PIC16C554T-04I/SS - 8-Bit 4MHz OTP MCU 13 I/O 20-SSOP
PIC16C554T-04I/SS

PIC16C554T-04I/SS - 8-Bit 4MHz OTP MCU 13 I/O 20-SSOP

The Microchip Technology PIC16C554T-04I/SS is an 8-bit CMOS RISC microcontroller in the PIC16C family, delivering 4 MIPS performance through a 200 ns instruction cycle at 4 MHz maximum clock, housed in a 20-pin SSOP (Shrink Small Outline Package). The device integrates 896 bytes of One-Time Programmable (OTP) program memory (organized as 512 x 14 words) and 80 bytes of data RAM, with 13 general-purpose digital I/O pins and 12-bit-wide instruction word architecture. The 'T' suffix denotes Tape & Reel packaging, '04' designates the 4 MHz speed grade, and 'I' indicates the industrial temperature range of -40C to +85C. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data RAM, and peripheral interfaces into one package. The PIC16C family uses a Harvard architecture with separate program and data buses, enabling single-cycle instruction fetch and decode. Within the broader semiconductor hierarchy, the PIC16C554 sits at the bottom of Microchip's mid-range 8-bit lineup, below the enhanced PIC16F and PIC18 families, and is classified as an OTP device - meaning the program memory can be written once and is not re-programmable in-circuit. Key features include a 35-instruction set optimized for C-compiled code, an on-chip Power-On Reset (POR) circuit, a Watchdog Timer (WDT) for runaway code recovery, a 4 MHz external oscillator interface, and low-power CMOS construction. The 20-SSOP package measures 5.30 mm x 7.20 mm with a 0.65 mm pin pitch, supporting surface-mount assembly on compact boards. Operating voltage is 4.5 V to 5.5 V (industrial spec per Microchip PIC16C554 datasheet), making the part suitable for 5V-only legacy systems. Architecturally, the PIC16C554 uses a 14-bit instruction word with 8-bit data path, eight-level hardware stack, and two file-select registers (FSR) for indirect addressing. Peripherals are minimal: 13 GPIO, one 8-bit timer/counter, and POR/WDT. The device does not include ADC, UART, or PWM, so designers use software bit-banging or external peripherals for analog and serial functions. Typical applications include low-cost consumer appliances, white-goods control boards, automotive body modules (non-safety), industrial sensor interfaces, and legacy replacement designs migrating from discrete logic. The industrial temperature grade suits factory-floor and outdoor enclosures. In automotive, prefer the PIC16C554T-04I/SS only for non-safety body electronics; safety-critical systems require AEC-Q100 qualified parts. When designing, note that OTP memory cannot be field-updated - plan firmware revisions carefully. The 4 MHz maximum clock restricts instruction throughput for math-intensive loops, and the 80-byte RAM limits stack depth and buffer sizes. Designers should use the MPLAB IDE with a Hi-Tech PICC or XC8 compiler. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C554T-20/SO - 8-Bit 20MHz OTP MCU 896B | Microchip
PIC16C554T-20/SO

PIC16C554T-20/SO - 8-Bit 20MHz OTP MCU 896B | Microchip

The Microchip Technology PIC16C554T-20/SO is an 8-bit CMOS OTP-based PIC16C-series microcontroller with a 20MHz maximum core clock, 896 bytes of one-time-programmable program memory (organized as 512 x 14-bit words), 80 bytes of RAM, and a 200 ns instruction execution time, all packaged in an 18-pin SOIC (7.50 mm / 0.295 in body width) with gull-wing leads. An 8-bit OTP microcontroller is a single-chip computer built on a Harvard architecture that executes one instruction per cycle from non-volatile program memory and writes volatile data to on-chip RAM; it is intended for high-volume, cost-sensitive, code-stable products where the firmware is finalized before production and does not need in-field updates. Within the broader taxonomy, the PIC16C554 belongs to the PIC16C family of mid-range microcontrollers, which sits between Microchip's baseline PIC10/12/16 and the high-performance PIC18 families. Key features include 35 single-word instructions, a wide 3V to 5.5V operating range, 13 I/O pins, an 8-bit timer/counter, watchdog timer with on-chip RC oscillator, power-on reset, power-saving sleep mode, and 200 ns instruction cycle. The PIC16C-series architecture uses a RISC instruction set with a single accumulator (W) and a memory-mapped I/O register scheme that simplifies peripheral access. Typical applications include appliance control, automotive subsystems (sensor conditioning, body electronics), industrial control logic, and remote-control encoders where low cost, deterministic timing, and compact code footprint outweigh the need for in-system reprogrammability. The 18-SOIC package supports standard surface-mount assembly lines and offers an industry-standard land pattern. When designing with this OTP device, ensure firmware is fully validated before programming because OTP memory cannot be erased or rewritten. For new designs where in-circuit reprogrammability is needed, consider the flash-based PIC16F554 or PIC16F505 family members instead. This page synthesizes distributor pricing, drop-in compatible alternatives, and practical design notes not found in the standalone manufacturer datasheet, helping engineers evaluate sourcing risk and second-source options for the PIC16C554T-20/SO.

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PIC16C554T-20/SS - 8-Bit OTP MCU, 20MHz, 896B | Microchip
PIC16C554T-20/SS

PIC16C554T-20/SS - 8-Bit OTP MCU, 20MHz, 896B | Microchip

The Microchip Technology PIC16C554T-20/SS is an 8-bit CMOS OTP (One-Time Programmable) RISC microcontroller from the PIC16C5x family, operating at up to 20 MHz core clock and housed in a 20-pin SSOP package. It integrates 896 bytes of program memory organized as 512 x 14 bits, 80 bytes of data RAM, and 13 general-purpose I/O pins, making it a compact control solution for high-volume embedded designs. An OTP microcontroller is a variation of the PIC16C5x baseline architecture in which the program memory is implemented as one-time-programmable EPROM rather than UV-erasable EPROM. This category, broadly termed microcontroller (MCU) or embedded controller, sits in the silicon hierarchy as: MCU -> embedded controller -> microprocessor -> semiconductor IC. OTP MCUs target cost-sensitive, high-volume, factory-programmed applications where field re-programming is not required, so they trade re-programmability for lower unit cost and simpler firmware logistics. Key features include 35 single-word instructions, 200 ns instruction execution time at 20 MHz, a hardware watchdog timer, power-on reset, and an operating voltage range of 3.0V to 5.5V. The 20-pin SSOP footprint (5.30 mm body width, 0.65 mm pitch) suits space-constrained boards, and the part supports a commercial temperature grade (0C to +70C) in this -20 speed variant. Architecturally the device is built around the classic PIC14-bit instruction word, single-accumulator Harvard structure with separate program and data buses, allowing simultaneous instruction fetch and operand access. The 12-bit wide PC supports a 2K-word program address space, of which 512 words (896 bytes) are realized on this die. The I/O structure uses bidirectional TTL/CMOS-compatible ports with programmable weak pull-ups. Typical applications include appliance controls, sensor front-ends, low-cost battery chargers, simple LED drivers, smoke detectors, and white-goods user-interface panels. Because the part is OTP, it is suited to mature, locked-down firmware that will not require field updates. When designing with the PIC16C554T-20/SS, ensure the in-circuit serial programming (ICSP) interface is reserved on the board even in production layouts - it remains the only way to program the OTP array before conformal coating or potting, and the same two pins can be reused for in-test boundary scan. Note that the -20 suffix denotes 20 MHz maximum clock; for lower-power designs a -04 (4 MHz) speed grade is also available. This page synthesizes distributor availability, parametric alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers verify supply, compare pin-compatible substitutes, and lock in long-term component strategy as of 2026-09-16.

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PIC16C554T-20E/SO - 8-Bit 20MHz OTP MCU 896B | Microchip
PIC16C554T-20E/SO

PIC16C554T-20E/SO - 8-Bit 20MHz OTP MCU 896B | Microchip

The Microchip Technology PIC16C554T-20E/SO is an 8-bit CMOS OTP-based PIC microcontroller running at 20 MHz instruction rate with 896 bytes (512 x 14) of One-Time-Programmable program memory and 80 bytes of RAM, housed in an 18-pin SOIC (0.295 inch / 7.50 mm width) package. The -20E speed designation delivers 200 ns instruction execution, while the E suffix indicates the extended industrial temperature grade of -40 °C to +125 °C. An OTP microcontroller (One-Time-Programmable microcontroller) is a single-chip microcomputer whose on-chip program memory can be written exactly once by the user at production programming time and is then permanently fixed. PIC16C-series devices sit at the entry level of the PIC architecture hierarchy: 8-bit MCU -> PIC16 family -> PIC16C sub-family -> OTP variants -> 18-pin small-outline package. They use a RISC-style Harvard architecture with only 35 single-word instructions, making code authoring straightforward for first-time embedded developers and cost-sensitive mass production. Key features include a 13-bit program counter capable of addressing 8 K words, an 8-level deep hardware stack, 12 I/O pins with individual direction control, a Watchdog Timer with its own on-chip RC oscillator, Power-on Reset, Brown-out Reset, an 8-bit Timer0 with an optional external prescaler, and a wide 3.0 V to 5.5 V operating voltage range. The device draws less than 2 mA at 5 V / 20 MHz and supports power-saving Sleep mode with Wake-up via interrupt or Watchdog. Internally the PIC16C554 uses a Harvard architecture with separate program and data buses, an ALU that operates on the W register and any file register, and a peripheral bus shared between the I/O ports and the timer. The 35-instruction RISC core allows most operations to execute in a single 200 ns instruction cycle at 20 MHz. The 18-pin SOIC version exposes Port A (5 pins), Port B (4 pins), and a partial Port C (3 pins) to the board. Typical applications include low-cost appliance control (washing machines, microwave ovens, coffee makers), battery chargers, sensor signal conditioning, LED driving and lighting controllers, automotive body modules (when -I grade suffices), remote controls, and any high-volume consumer product whose firmware is finalized before mask release. The device is also widely used as an educational and prototyping platform because of its low cost, simple instruction set, and broad tool support. When designing with this part, pay attention to the OTP constraint: code cannot be field-upgraded, so verify firmware on a flash-equivalent PIC16F554 first if iterative development is needed. Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of the pin, and ensure the MCLR pin has a proper reset circuit (typically 10 kΩ pull-up to VDD). The -20 speed grade is the maximum; an oscillator mode configuration mismatch (XT / HS / RC) can prevent startup, especially at temperatures below 0 °C. This page synthesizes distributor pricing, drop-in alternatives drawn from Microchip's pin-compatible 18-pin PIC family, and practical design notes not found in the bare datasheet.

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PIC16C554T-20E/SS - 8-Bit 20MHz OTP MCU 896B | Microchip
PIC16C554T-20E/SS

PIC16C554T-20E/SS - 8-Bit 20MHz OTP MCU 896B | Microchip

The Microchip Technology PIC16C554T-20E/SS is a member of the PIC16C5xx family of 8-bit CMOS EPROM/OTP-based microcontrollers, featuring 896 bytes (512 x 14) of One-Time Programmable program memory and 80 bytes of RAM. It operates at a 20 MHz instruction cycle rate from a supply voltage of 3.0 V to 5.5 V, packaged in a 20-pin SSOP (5.30 mm body width) with tape-and-reel packaging. An OTP (One-Time Programmable) microcontroller is a class of MCU whose program memory can be written exactly once during production programming and is not erasable by UV or electrical means. These devices sit within the broader 8-bit MCU category (alongside flash-based MCUs, mask-ROM MCUs, and EEPROM MCUs), and historically were used as low-cost programmable logic replacements before flash MCUs became economical in small quantities. Key features of the PIC16C554T-20E/SS include a RISC instruction set with only 33 single-word/single-cycle instructions, a Power-On Reset (POR) circuit, a Watchdog Timer (WDT) with an on-chip RC oscillator, an 8-bit real-time timer/counter (Timer0) with an 8-bit prescaler, and up to 12 I/O pins. The device operates over the extended industrial temperature range of -40°C to +125°C and is built on Microchip's EPROM-based CMOS process technology. The PIC16C554T-20E/SS implements a Harvard-architecture RISC core with a 12-bit instruction word and a two-stage instruction pipeline, achieving instruction execution in one oscillator cycle at 20 MHz (200 ns per instruction). On-chip peripherals are accessed through special-function registers mapped into the data-memory space, and interrupts are supported through a single vector with a context-saving hardware mechanism. Typical applications include low-cost appliance control, sensor signal conditioning front-ends, intelligent sensor modules, simple industrial timers and counters, and replacement of discrete logic in white goods and HVAC controls. Its wide operating voltage range also makes it suitable for 3.3 V and 5 V mixed-logic designs. When designing with this device, note that OTP memory cannot be re-programmed in-circuit, so production programming via a device programmer is mandatory; a flash-based PIC16F equivalent (e.g. PIC16F648A-I/SS) is preferred when development cycles require multiple firmware iterations. This page synthesizes distributor pricing snapshots, drop-in compatible alternatives sourced from Microchip's PIC16C5xx family, and practical design notes not typically found in the manufacturer datasheet, giving engineers a fast, trustworthy decision resource.

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PIC16C554T-20I/SO - 8-Bit 20MHz OTP MCU, 896B, 18-SOIC | Microchip
PIC16C554T-20I/SO

PIC16C554T-20I/SO - 8-Bit 20MHz OTP MCU, 896B, 18-SOIC | Microchip

The Microchip Technology PIC16C554T-20I/SO is an 8-bit PIC microcontroller in the PIC16C5x baseline family, featuring a 20 MHz CPU core, 896 bytes of One-Time Programmable (OTP) program memory organized as 512 words of 14 bits, and 80 bytes of data RAM. It is housed in an 18-pin SOIC (Small Outline Integrated Circuit) package with 7.50 mm body width and is rated for the industrial temperature range of -40C to +85C. The -20 speed suffix indicates a 20 MHz maximum oscillator frequency, while the I-suffix designates industrial-grade operation and the T-suffix marks Tape & Reel packaging. What is an OTP microcontroller? An OTP (One-Time Programmable) microcontroller contains non-volatile program memory that can be written exactly once by the user, typically using a device programmer before PCB mounting. OTP MCUs sit between Mask ROM devices (cheapest at very high volumes but require factory programming) and Flash-based MCUs (re-programmable in-circuit). For low-to-medium volume production, OTP parts offer lower per-unit cost than Flash parts without the tooling NRE of Mask ROM. Key features include a RISC instruction set with only 33 single-word instructions, two 8-bit I/O ports (RA and RC), one 8-bit timer (TMR0), a watchdog timer with its own on-chip RC oscillator, power-on reset, brown-out detection, and an operating voltage range from 2.5 V to 5.5 V. The PIC16C5x baseline core has no hardware interrupt controller and uses a polled software architecture. The device uses a Harvard architecture with separate program and data buses, executing one instruction per instruction cycle (4 oscillator clocks) for a 200 ns instruction time at 20 MHz. This deterministic single-cycle execution makes the PIC16C554 well-suited for real-time control loops where precise timing matters. The baseline core has a 2-level deep hardware stack and no software stack pointer. Typical applications include appliance control, sensor signal conditioning, LED lighting controllers, simple motor control, remote controls, battery-powered instruments, and automotive body electronics (non-safety). The industrial temperature range and small 18-SOIC footprint suit dense control boards. When designing with this part, note that OTP memory means firmware must be fully verified before programming. Allow for a programming connector footprint (ICSP) on the PCB if in-system verification is required during pilot runs. Always place a 0.1 uF decoupling capacitor within 5 mm of the VDD pin.

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PIC16C554T-20I/SS - 8-Bit OTP MCU, 20MHz, 20-SSOP | Microchip
PIC16C554T-20I/SS

PIC16C554T-20I/SS - 8-Bit OTP MCU, 20MHz, 20-SSOP | Microchip

The Microchip Technology PIC16C554T-20I/SS is an 8-bit CMOS OTP (One-Time Programmable) microcontroller from the PIC16C family, delivering up to 20 MHz operation with 200 ns instruction execution in a 20-pin SSOP package. It integrates 896 bytes of OTP program memory (512 x 14 words) and 80 bytes of data RAM, with 13 programmable I/O pins and an operating voltage range of 3.0 V to 5.5 V. The device supports the industrial -40C to +85C temperature range and ships in tape-and-reel packaging as indicated by the 'T' suffix. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals on one die. The PIC architecture pioneered the Harvard RISC design for embedded controllers, executing one instruction per clock cycle (except branches) and offering deterministic interrupt response. Within the system hierarchy, a PIC16C-series MCU belongs to the broader category of microcontroller -> embedded processor -> integrated circuit -> semiconductor. The 16C family specifically uses OTP EPROM rather than flash, making it suited for high-volume mature programs where code stability and low unit cost outweigh in-field reprogrammability. Key features include 35 single-word instructions, a 14-bit instruction word, two 8-bit timer/counters (Timer0 and Timer2), a Watchdog Timer (WDT) with on-chip RC oscillator, Power-On Reset (POR), and a programmable code-protection mechanism. The device consumes very low operating current, supporting battery-powered and energy-conscious designs. Its SSOP-20 footprint (5.30 mm body width) is widely accepted for industrial embedded boards. Architecturally, the PIC16C554 uses a RISC engine with separate program and data buses, eliminating Von Neumann fetch bottlenecks. The OTP cell array is programmed via standard Microchip device programmers (e.g., MPLAB PM3). Code protection bits and ID locations are supported. This 8-bit core is fully supported by MPLAB X IDE and the XC8 C compiler, with a mature library ecosystem covering timers, ADC emulation via RC, and bit-banged peripherals. Typical applications include industrial control logic, sensor interface modules, low-cost consumer appliances, white-goods user-interface boards, automotive body electronics sub-modules, and battery-operated instrumentation. Designers choose this OTP part for stable production firmware where field re-programming is unnecessary, reducing per-unit cost versus equivalent flash devices. Design consideration: Because the PIC16C554T-20I/SS is OTP (not flash), the firmware must be fully validated on a windowed or flash-equivalent PIC16F554 prototype before committing to OTP volume production. Also plan for in-circuit programming (ICSP) test points since OTP parts cannot be re-programmed during PCB debug. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that complement the manufacturer datasheet with cross-references, parametric comparisons, and engineered replacement guidance.

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PIC16C558-04/P - 8-bit 4MHz OTP MCU, 3.5KB, 18-PDIP | Microchip
PIC16C558-04/P

PIC16C558-04/P - 8-bit 4MHz OTP MCU, 3.5KB, 18-PDIP | Microchip

The Microchip Technology PIC16C558-04/P is a member of the PIC16C55x family of 8-bit CMOS microcontrollers, packaged in an 18-pin PDIP and offering 3.5KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 13 digital I/O pins. The device is built on Microchip's Harvard RISC architecture, executing 35 single-word instructions at a 200 ns instruction cycle when running at 4 MHz. An 8-bit microcontroller (MCU) is a single-chip computer integrating a CPU, memory, and peripherals on a single die. 8-bit MCUs sit at the base of the embedded computing hierarchy: MCU -> microcontroller -> embedded processor -> semiconductor. Within the Microchip taxonomy, the PIC16C5x family is the cost-optimized, OTP-based predecessor to the flash-based PIC16F5x/PIC16Fxxx lines, suited to high-volume, fixed-code applications. Key specifications of the PIC16C558-04/P include a 4 MHz maximum oscillator frequency, 13 GPIO pins arranged across ports RA and RB, an 8-bit timer/counter (TMR0) with an 8-bit programmable prescaler, a wide 3.0 V to 5.5 V operating range, and low-power CMOS construction. The /04 speed suffix indicates the 4 MHz oscillator grade; /20 (20 MHz) variants are also produced. The /P suffix denotes the through-hole PDIP-18 package on a 0.300 inch (7.62 mm) row spacing. The PIC16C558 uses a 14-bit instruction word with an 8-bit data path. Its RISC CPU keeps the instruction set to 35 single-word opcodes, reducing code density overhead and easing assembly development. Internal peripherals include a watchdog timer, power-on reset, brown-out reset, and an 8-bit prescaler shared between TMR0 and the watchdog. Typical applications include appliance control, automotive body electronics, sensor interface nodes, simple motor control, industrial monitoring, and low-cost consumer products. The 18-pin count targets mid-sized embedded designs that need more I/O than 14-pin PICs but do not require the larger 20- or 28-pin PIC16C55x siblings. When designing with the PIC16C558-04/P, note that the OTP program memory cannot be re-programmed in-circuit - firmware must be committed at production time. For prototyping or field-upgradable applications, consider the PIC16F558 or PIC16F57 (flash-based equivalents in the same 18-pin PDIP). An external RC or crystal oscillator between OSC1/OSC2 sets the system clock; a 4 MHz crystal is typical for the /04 grade. This page synthesizes distributor pricing from Mouser and DigiKey, drop-in and cross-package alternatives drawn from Microchip's compatibility charts, and design notes grounded in the PIC16C55x datasheet - information not consolidated on any single manufacturer or distributor page.

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PIC16C558-04E/P - 8-Bit 4MHz OTP MCU 3.5KB | Microchip
PIC16C558-04E/P

PIC16C558-04E/P - 8-Bit 4MHz OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16C558-04E/P is an EPROM/OTP-based 8-bit CMOS microcontroller from the PIC16C family, delivering 4 MHz (200 ns instruction cycle) performance with 3.5 KB (2K x 14) of program memory and 128 bytes of RAM in a through-hole 18-pin PDIP package. The device exposes 13 digital I/O pins and integrates a 35-instruction RISC core designed for deterministic, single-cycle execution across most instructions. The "E" suffix denotes the extended industrial temperature grade (-40C to +125C), while "04" indicates the 4 MHz maximum clock, and "/P" identifies the PDIP-18 package. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data memory (RAM), and configurable I/O peripherals on a single die. PIC microcontrollers belong to the RISC (Reduced Instruction Set Computer) family, characterized by a small, fixed-length instruction set optimized for low power consumption and predictable timing - making them suitable for embedded control applications ranging from appliance controllers to automotive subsystems. The PIC16C5x series is the OTP (One-Time Programmable) variant, intended for production volumes where reprogrammability is not required. Key features of the PIC16C558-04E/P include a 200 ns instruction execution time, hardware timer/counter peripherals, a watchdog timer for system reliability, power-on reset, brown-out detection, and an operating voltage range of 3.0 V to 5.5 V. The device supports in-circuit serial programming (ICSP) via its RB6/RB7 pins, allowing field updates and factory calibration. The CMOS process delivers low power consumption, typically a few mA active and microamp-level standby current, enabling battery-friendly designs. The PIC16C558 utilizes a Harvard architecture with separate program and data buses, allowing instruction fetch and operand read to occur in the same cycle - one reason for its fast instruction throughput. The 12-bit program word width provides compact code density for C and assembly, while the 8-bit data path simplifies arithmetic and bit-manipulation operations common in embedded control loops. The integrated RC oscillator or external crystal options cover the majority of timing needs without external components. Typical applications for the PIC16C558-04E/P include industrial control logic, sensor interfacing, appliance control boards, automotive body electronics (pre-CAN nodes), simple sensor hubs, remote controls, and replacement of discrete logic gates. Its 13 I/O pins make it well suited to small-signal multiplexing tasks and timing-critical control loops. When designing with this part, note that OTP memory is one-time programmable - any firmware revision requires a new device. For prototyping or production with code revisions, the Flash-based PIC16F558 equivalent is recommended. The extended-temperature grade ("E") supports -40C to +125C operation, making this part suitable for harsh-environment industrial and automotive under-hood applications. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet or distributor product pages.

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PIC16C558-04I/P - 4MHz 8-Bit OTP MCU 13 I/O 18-PDIP | Microchip
PIC16C558-04I/P

PIC16C558-04I/P - 4MHz 8-Bit OTP MCU 13 I/O 18-PDIP | Microchip

The Microchip PIC16C558-04I/P is an 8-bit CMOS OTP-based PIC microcontroller executing instructions in 200 ns with only 35 single-word instructions, housed in an 18-pin PDIP through-hole package. According to the Microchip PIC16C558 datasheet (40143E), the device integrates 3.5KB (2K x 14) of OTP program memory, 128 bytes of data RAM, 13 digital I/O pins, and an 8-bit timer/counter (TMR0) with an 8-bit programmable prescaler, all running from a 2.5V to 5.5V supply. A microcontroller (MCU) is a single-chip computer containing a CPU, non-volatile program memory (ROM/OTP/Flash), working RAM, and programmable peripherals. PIC microcontrollers use a Harvard RISC architecture with separate program and data buses, enabling deterministic instruction timing critical for real-time control. The PIC16C55x family targets low-cost embedded control and belongs to the broader category: microcontroller -> embedded processor -> semiconductor IC. Key features of the PIC16C558-04I/P include its 4 MHz maximum operating frequency (the -04 speed grade), 13 I/O pins across PORTA (5 bits) and PORTB (8 bits), a 2-level hardware stack, direct/indirect/relative addressing modes, and 8-bit real-time clock/counter TMR0 with software-programmable prescaler. The OTP (One-Time Programmable) program memory enables low per-unit cost in production volumes. The architecture uses a 12-bit wide instruction word with an 8-bit data path, maximizing code density. Seven special-function hardware registers plus two file-select registers govern I/O and control. The device supports in-circuit serial programming (ICSP) via RB6/RB7, enabling firmware update after PCB assembly. The "I" industrial temperature suffix extends operation to -40C to +85C. Typical applications include automotive body controllers, industrial sensor interfaces, appliance control boards, security system keypads, and low-end consumer electronics. The wide 2.5V-5.5V range supports both 3.3V and 5V system designs with a single BOM. When designing with this device, ensure MCLR is tied high through a 10 kohm pull-up for normal operation; tie low only for reset. Place a 0.1 uF decoupling capacitor on VDD within 5 mm of the pin, with a bulk 1-10 uF cap on the same rail. Watchdog timer and power-on reset defaults must be configured in software at startup. This page synthesizes current distributor pricing, drop-in PIC16C55x alternatives from Microchip's parametric family, and practical through-hole PCB layout notes not consolidated in the manufacturer datasheet.

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PIC16C558-04I/SO - 8-bit OTP MCU, 4MHz, 3.5KB | Microchip
PIC16C558-04I/SO

PIC16C558-04I/SO - 8-bit OTP MCU, 4MHz, 3.5KB | Microchip

The Microchip Technology PIC16C558-04I/SO is an 8-bit CMOS OTP-based RISC microcontroller in an 18-pin SOIC package, executing one instruction every 200 ns at a 4 MHz oscillator rate. It integrates 3.5 KB of program memory (2K x 14 words), 128 bytes of RAM, and a 7+1 hardware register file within the classic PIC16 mid-range core. Industrial temperature grade (-40C to +85C) supports deployment in uncontrolled environments. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory (here, one-time-programmable EPROM/OTP), and peripherals on one die. PIC16C5xx MCUs sit inside the hierarchy: PIC16C5xx -> PIC16 family -> PIC16C OTP series -> 8-bit microcontroller -> RISC processor -> embedded computing IC. The 35 single-word instruction set, two-level hardware stack, and direct/indirect/relative addressing modes make the PIC16C558 an easy-to-learn platform for engineers building simple control loops. Key features include seven or eight Special Function Registers (SFRs), an 8-bit Timer0 with a programmable prescaler, a watchdog timer for fault recovery, and a power-on reset (POR) block. The brown-out reset (BOR) and power-saving SLEEP mode reduce quiescent current for battery-powered nodes. CMOS process technology delivers low power consumption typical of the PIC16C family. The PIC16C558 uses a Harvard architecture with separate program and data buses, a 12-bit wide instruction word, and an 8-bit wide data path. Two I/O ports (PORTA 5 pins, PORTB 8 pins) provide up to 13 digital I/O lines, and the device operates from 3.0 V to 5.5 V. This combination suits applications needing modest compute and GPIO with deterministic instruction timing rather than high throughput. Typical applications include appliance controllers, sensor signal conditioning front-ends, automotive body electronics sub-modules, industrial timer/relay controllers, and remote sensor transmitter nodes. Designers value the part for low cost and predictable interrupt latency when migrating from earlier PIC16C5x designs. When designing with this OTP MCU, remember the program memory cannot be erased electrically; use the PIC16F558 flash variant during prototyping. Place decoupling capacitors as close as possible to VDD/VSS, and respect the 4 MHz maximum oscillator rating with margins for temperature drift. This page synthesizes distributor pricing, drop-in compatible alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C558-20/P - 8-Bit 20MHz OTP MCU 3.5KB | Microchip
PIC16C558-20/P

PIC16C558-20/P - 8-Bit 20MHz OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16C558-20/P is an EPROM/ROM-based 8-bit CMOS microcontroller from the PIC16C5x family, operating at up to 20MHz with 200ns instruction execution, integrating 3.5KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 13 general-purpose I/O pins in an 18-pin PDIP through-hole package. As a member of Microchip's foundational mid-range PIC architecture, it executes 35 single-word instructions and features a two-level hardware stack, direct/indirect/relative addressing modes, an 8-bit Timer0, a watchdog timer, and seven or eight special function hardware registers. The 12-bit wide instruction word paired with an 8-bit data path delivers deterministic RISC performance suited to cost-sensitive embedded control. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, I/O peripherals, and timers on one die. Within the IC taxonomy, an 8-bit MCU sits under: microcontroller -> microprocessor -> integrated circuit -> semiconductor. The PIC16C5x family specifically targets simple control loops, sensor interfaces, and human-machine-input (HMI) tasks where 8-bit performance, low pin count, and OTP/EPROM-based code storage are sufficient. OTP memory allows the device to be programmed once during manufacturing or development, making the PIC16C558 ideal for low- to mid-volume production runs that do not require the field-reprogrammability of Flash-based PIC16F parts. Key features include a 20MHz maximum oscillator frequency, an operating voltage range of 2.5V to 6.0V (commercial), low-power CMOS design, an 8-bit real-time clock/counter (TMR0), power-on reset, watchdog timer with its own on-chip RC oscillator for reliable operation, and a programmable code-protection mechanism. The 18-pin PDIP package provides easy through-hole prototyping on breadboards and standard 0.1-inch-pitch perfboards, while the wide 2.5-6.0V supply range supports both 3.3V and 5V system rails. Compared with the PIC16C554, the PIC16C558 doubles the RAM to 128 bytes while retaining the same 13 I/O and core 8-bit architecture. Typical applications include consumer appliance control, automotive body electronics (non-safety), industrial sensor interfaces, LED display drivers, IR remote control transmitters, low-end motor control, battery chargers, and simple HMI panels. Its 35-instruction RISC core enables rapid development in assembly or C, and the watchdog timer makes it well suited to unattended remote nodes that must recover from firmware or environmental faults. Engineers choose the PIC16C558 when they need a proven, mature 8-bit core with OTP memory in a hobbyist-friendly DIP footprint. When designing with this device, note that OTP memory cannot be erased, so firmware must be fully debugged on a Flash equivalent (such as the PIC16F558) before committing to a PIC16C558 production build. Always allocate a watchdog timer timeout appropriate to the main loop period, and place a 0.1uF decoupling capacitor as close as possible to the VDD pin. The 18-pin PDIP is being phased out for many new designs in favor of smaller SOIC and SSOP footprints, so consider long-term availability and the availability of Flash siblings (PIC16F558) for ongoing development. This page synthesizes distributor pricing, drop-in Microchip replacements, and practical design notes not found in the manufacturer datasheet alone. Engineers evaluating the PIC16C558-20/P for new designs or sustaining legacy systems will find verified parametric data, cross-reference alternatives, and PCB layout guidance tailored to OTP-based PIC16C5x designs.

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PIC16C558-20/SO - 8-Bit 20MHz 3.5KB OTP MCU 18-SOIC | Microchip
PIC16C558-20/SO

PIC16C558-20/SO - 8-Bit 20MHz 3.5KB OTP MCU 18-SOIC | Microchip

The Microchip Technology PIC16C558-20/SO is an 8-bit PIC RISC microcontroller with 3.5KB (2K x 14) One-Time-Programmable (OTP) program memory, 128 bytes of RAM, 13 I/O pins, and a 20MHz maximum clock speed, housed in an 18-pin SOIC (SO) package. It executes instructions in 200 nanoseconds with only 35 single-word instructions, simplifying firmware development for cost-sensitive embedded designs. Operating from 3.0V to 5.5V, the PIC16C558 is built on CMOS technology and is well-suited to automotive, industrial, and consumer applications. An 8-bit OTP microcontroller is a small single-chip computer built around an 8-bit data path with non-volatile program memory that can be written exactly once (One-Time-Programmable), commonly used in low-cost, high-volume products. PIC microcontrollers belong to the broader family of microcontrollers -> embedded processors -> semiconductors, and the PIC16C series specifically targets mid-range applications requiring moderate I/O count (13-33 pins), modest memory (a few KB), and deterministic real-time response. Key features of the PIC16C558-20/SO include a Harvard architecture with separate program and data buses, 8-level hardware stack, integrated power-on reset, brown-out reset, watchdog timer, and an 8-bit timer/counter. The 18-pin SOIC package provides 13 digital I/O pins, each capable of sinking/sourceing up to 25 mA, plus dedicated oscillator and reset pins. The CMOS process yields low power consumption suitable for battery-operated or line-powered industrial equipment. The PIC16C558 uses a RISC instruction set where all 35 instructions are single-word (14-bit) and execute in a single instruction cycle (4 clock periods), giving 5 MIPS throughput at 20MHz. The OTP program memory allows code to be written during manufacturing test, ideal for mature products. The architecture's deterministic interrupt response and hardware stack simplify real-time control loops common in appliance, sensor, and motor-driver subsystems. Typical applications include automotive body controllers, industrial sensor interfaces, consumer white goods, security keypads, low-end motor control, LED driver controllers, and battery chargers. The wide operating voltage (3.0V-5.5V) makes it compatible with both 3.3V and 5V system rails commonly found in legacy industrial designs. The 18-pin SOIC package also supports through-hole PCB reflow assembly. When designing with the PIC16C558-20/SO, select the appropriate oscillator mode (XT, HS, LP, or RC) based on system clock requirements and EMI constraints. Note that OTP memory cannot be reprogrammed, so engineering samples should use windowed (JW) or Flash (PIC16F) variants during development. This page synthesizes distributor pricing, pin-compatible PIC16C5x drop-in alternatives, and practical design notes not aggregated on the manufacturer datasheet or individual distributor pages.

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PIC16C558-20/SS - 3.5KB OTP 8-bit MCU, 20 SSOP | Microchip
PIC16C558-20/SS

PIC16C558-20/SS - 3.5KB OTP 8-bit MCU, 20 SSOP | Microchip

The Microchip Technology PIC16C558-20/SS is an EPROM-based 8-bit CMOS microcontroller in a 20-pin SSOP (SS) package, delivering 200 ns instruction execution across 35 single-word instructions in the PIC mid-range architecture. The device integrates 3.5 KB of OTP program memory, 128 bytes of RAM, and 13 digital I/O pins, with a 20 MHz maximum operating frequency that yields a 200 ns instruction cycle. It is offered in the -20 speed grade operating from 3.0 V to 5.5 V across the commercial 0 °C to +70 °C temperature range. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, working RAM, and peripheral interfaces. The PIC16C558 belongs to the PIC16C5X family of OTP (one-time-programmable) baseline-to-mid-range controllers, sitting in the system hierarchy as follows: PIC16C5X → PIC16C family → 8-bit PIC microcontroller → embedded MCU → semiconductor. The OTP memory is factory- or field-programmed once using a device programmer and cannot be erased, making the PIC16C558 suited to high-volume fixed-code applications rather than firmware development. Key features include 13 bidirectional I/O pins with individual direction control, an 8-bit timer/counter (TMR0) with an 8-bit prescaler, a watchdog timer with on-chip RC oscillator for reliable system recovery, and power-saving SLEEP mode. The device also integrates a 4 MHz internal RC oscillator option (selected at programming time), a programmable code-protection scheme, and an in-circuit serial programming (ICSP) interface that allows programming after PCB assembly. The PIC16C558 uses a RISC Harvard architecture with separate program and data buses, allowing instruction fetch and data access to occur in parallel. The 8-bit ALU, 8-bit working register (W), 11-bit program counter, and 2-level deep hardware stack provide deterministic execution suitable for interrupt-free control loops. The 20 MHz clock with 4-clock-per-instruction cycle produces the headline 200 ns instruction time referenced in the device family literature. Typical applications include appliance controls, automotive body electronics (with the -I and -E temperature variants), industrial sensor interfaces, LED drivers, and low-cost remote-control transmitters. The wide 3.0-5.5 V supply range supports both 3.3 V and 5 V system designs. Engineers designing with the PIC16C558 should plan for OTP programming early in the design cycle, since the device cannot be re-programmed in-circuit beyond the initial ICSP write; for iterative development a FLASH-based PIC16F equivalent is recommended, but only certain speed-grade and pinout variants qualify as true drop-in parts. This page synthesizes distributor pricing, drop-in same-package alternatives drawn from the verified cross-reference data, and practical design notes not aggregated on any single manufacturer or distributor page.

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PIC16C558-20E/P - 8-Bit 20MHz OTP MCU, 3.5KB | Microchip
PIC16C558-20E/P

PIC16C558-20E/P - 8-Bit 20MHz OTP MCU, 3.5KB | Microchip

The Microchip Technology PIC16C558-20E/P is an 8-bit CMOS OTP (One-Time Programmable) RISC microcontroller in an 18-pin PDIP (through-hole) package, executing instructions at 20MHz with a 200ns instruction cycle. It integrates 3.5KB (2K x 14) of OTP program memory and 128 bytes of RAM, making it a cost-effective solution for high-volume embedded control. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory (here OTP), and peripherals. It sits at the base of the embedded hierarchy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. PIC16C-series parts use a RISC architecture with only 35 single-word instructions, easing code development and minimizing learning curves for new designs. Key features of the PIC16C558-20E/P include the 20MHz maximum clock (5MHz oscillator input), 13 I/O pins, two 8-bit timers (Timer0, Timer2) plus one 16-bit timer (Timer1), a Watchdog Timer with its own on-chip RC oscillator, and wide operating voltage support. The -E suffix denotes the Extended automotive temperature grade (-40C to +125C), distinguishing it from commercial/industrial grade variants. The 18-pin PDIP package is through-hole for prototyping and legacy designs. The PIC16C558 architecture uses a Harvard-style separate program/data bus design with a 14-bit instruction word. This contrasts with later PIC16F flash parts which offer re-programmability. The OTP memory requires a device programmer at production time but offers lower per-unit cost in mature, unchanging firmware applications. Typical applications include automotive body controllers, appliance controls, sensor signal conditioning, simple motor control, and industrial automation subsystems. The extended temperature grade makes it particularly attractive for under-hood automotive modules and harsh industrial environments. The legacy 18-pin PDIP footprint suits through-hole assembly lines and educational/development platforms where socketed parts are preferred. When designing with this part, note that OTP devices cannot be reprogrammed in-circuit - firmware bugs require part replacement. Designers should prototype with the pin-compatible PIC16F558 (flash) variant, then transition to PIC16C558-20E/P for cost-optimized production runs. Decoupling capacitors (100nF) must be placed within 6mm of VDD, and unused I/O pins should be configured as outputs to minimize current draw. This page synthesizes distributor pricing, drop-in PIC16C558 family alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C558-20E/SS - 8-Bit 20MHz OTP MCU, 3.5KB | Microchip
PIC16C558-20E/SS

PIC16C558-20E/SS - 8-Bit 20MHz OTP MCU, 3.5KB | Microchip

The Microchip Technology PIC16C558-20E/SS is an EPROM/OTP-based 8-bit CMOS microcontroller from the PIC16C family, offering 3.5KB (2K x 14) of program memory, 128 bytes of RAM, and a 20MHz maximum operating frequency in a 20-pin SSOP package. It executes single-cycle instructions in 200ns and uses Microchip's PIC RISC architecture with only 35 single-word instructions, simplifying firmware development for embedded control loops. The /E suffix marks the Extended automotive temperature grade (-40C to +125C). An 8-bit microcontroller (MCU) is a single-chip computer containing a CPU, program memory, RAM, and peripherals designed to read sensors and drive actuators in real time. MCUs sit at the lowest tier of the compute hierarchy - below microprocessors and SoCs - and trade raw speed for deterministic I/O handling, low power draw, and predictable interrupt latency. The PIC16C family occupies the mid-range PIC tier, balancing instruction efficiency, peripheral integration, and cost for industrial and automotive embedded designs. Key features of the PIC16C558-20E/SS include 13 digital I/O pins, a 20MHz internal oscillator (4x PLL from a 5MHz source), one 8-bit timer and one 16-bit timer, a watchdog timer with on-chip RC oscillator, and brown-out reset for power-supply monitoring. The device operates from 3.0V to 5.5V, supports in-circuit serial programming (ICSP), and integrates an 8-bit ADC on selected pins. Its 20-pin SSOP (5.30mm body) footprint makes it drop-in compatible with the PIC16C554 family. Architecturally, the PIC16C558 uses a Harvard bus with separate program and data paths, an 8-bit ALU, and a hardware stack that supports direct, indirect, and relative addressing. The OTP program memory enables prototype-friendly one-time programming, while the EPROM-based cell supports windowed erasing during development. With 2K x 14 instructions and 128 bytes of data RAM, it targets applications that need more code space than the PIC12C/PIC16C5x baseline but less than the PIC16C7x peripheral-rich tier. Typical applications include automotive body controllers, HVAC damper drivers, lighting ballasts, appliance control boards, security keypads, and remote sensor interfaces. The Extended temperature grade and robust brown-out reset make it particularly attractive for under-hood automotive and outdoor industrial installations. When designing in this part, ensure your firmware budget stays under 2K words (3.5KB OTP) and that the ICSP pins are reserved on production boards to allow field reprogramming during qualification. The PIC16C554-20I/SS shares the same SSOP-20 footprint and can serve as a mask-ROM alternative once the design is frozen. This page synthesizes distributor availability, drop-in PIC16C family alternatives, and practical design notes that go beyond the bare Microchip datasheet, helping engineers select, source, and qualify the PIC16C558-20E/SS faster.

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PIC16C558-20I/P - 20MHz 8-bit OTP MCU, 3.5KB EPROM, 18-PDIP | Microchip
PIC16C558-20I/P

PIC16C558-20I/P - 20MHz 8-bit OTP MCU, 3.5KB EPROM, 18-PDIP | Microchip

The Microchip Technology PIC16C558-20I/P is an EPROM-based 8-bit CMOS microcontroller built on the PIC16 architecture, delivering 20 MHz (200 ns instruction cycle) performance with 3.5 KB of OTP program memory, 128 bytes of RAM, and 13 I/O pins in an 18-pin PDIP through-hole package. The -20 speed grade and 3.3 V/5 V dual-rail operation suit it to industrial-grade (-40 °C to +85 °C) embedded control, and the 35 single-word instruction RISC core simplifies code development while preserving deterministic interrupt response. The device is a one-time-programmable (OTP) variant of the PIC16C55x family, aimed at cost-sensitive volume production where in-system re-programmability is not required. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and peripheral I/O on one die. The PIC16C558 belongs to the mid-range PIC microcontrollers category, which sits inside the broader 8-bit MCU taxonomy (8-bit MCU -> microcontroller -> embedded processor -> semiconductor). Mid-range PIC parts extend baseline PIC12/PIC14 devices with more interrupts, larger memory, and a richer peripheral set, while remaining cheaper and simpler than 16-bit dsPIC or 32-bit PIC32 parts. Key features include 200 ns instruction execution at 20 MHz, 14-bit instruction width, two 8-bit timers (Timer0, Timer2) plus a 16-bit Timer1, a 10-bit (approximate) capture/compare/PWM module, 8-bit parallel port architecture, and a programmable watchdog timer with on-chip RC oscillator. Power-saving features include SLEEP mode with wake-up on pin change, and the device supports in-circuit serial programming (ICSP) despite the OTP program memory, allowing prototype code drop-in to OTP shipping units. The architecture is a Harvard RISC design with separate program (14-bit) and data (8-bit) buses, eliminating fetch bottlenecks and giving deterministic single-cycle execution for most instructions. The OTP memory cell uses a one-time-fuse bit per instruction word, providing non-volatile storage after programming. Brown-out reset (BOR), power-on reset (POR), and a configurable oscillator selection (LP, XT, HS, RC) make the part tolerant of noisy industrial supplies and a wide range of crystal frequencies. Typical applications include appliance control boards, automotive body electronics subsystems, industrial sensor interfaces, simple closed-loop fan or pump controllers, and low-cost user-interface panels where the PIC16C558-20I/P can replace larger 40-pin MCUs. The 18-pin PDIP footprint remains popular in through-hole manufacturing lines and in legacy designs that need a stable, long-lifecycle controller. When designing with this device, allocate one full 5 V-tolerant port for the ICSP interface even in production units, because OTP parts still require ICSP for the initial code load. Decouple VDD/VSS with a 100 nF ceramic placed within 5 mm of the pins, and configure the MCLR pin with the standard 10 kΩ pull-up plus a 100 nF reset-delay capacitor to ensure clean power-on behavior. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, organized for both procurement and engineering audiences.

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PIC16C558-20I/SO - 8-Bit 20MHz OTP MCU 3.5KB | Microchip
PIC16C558-20I/SO

PIC16C558-20I/SO - 8-Bit 20MHz OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16C558-20I/SO is an EPROM-based 8-bit CMOS microcontroller from the PIC16C family, featuring 3.5KB (2K x 14) of OTP program memory, 128 bytes of RAM, and 13 I/O pins, packaged in an 18-pin SOIC (SO) wide-body 7.50mm width tube. It executes instructions in a 200ns instruction cycle at 20MHz and operates from a 3.0V to 5.5V supply. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non‑volatile program memory, working RAM, and peripheral interfaces such as timers, interrupts, and I/O. The PIC16C family is one of the foundational Microchip PIC architectures and sits within the broader taxonomy: microcontroller → embedded processor → semiconductor IC → electronic component. Within the power and signal hierarchy, an MCU orchestrates sensors, actuators, and communication interfaces while the system power supply, often an LDO or DC-DC converter, feeds it. Key features of the PIC16C558-20I/SO include 35 single-word instructions, a RISC architecture with 14-bit instruction width, an 8-level deep hardware stack, a watchdog timer, power-on reset, power-saving SLEEP mode, and an internal oscillator option on certain family members. The device is OTP (One-Time Programmable), meaning the program memory can be written only once by the user, distinguishing it from flash-based PIC16F successors. The wide-body SOIC (SO) package measures 0.300 inch (7.50mm) and ships in anti-static tubes for prototyping and low-volume production. Designed for cost-sensitive embedded control, the PIC16C558-20I/SO is widely deployed in white-goods controls, simple sensor interfaces, automotive body electronics, and industrial timers. Its 13 I/O pins comfortably drive LED indicators, keypads, relays, and serial links, while the 20MHz clock supports time-critical loops such as UART bit-banging or PWM motor control. Typical applications include appliance control boards (washing machines, microwave ovens, coffee makers), HVAC thermostat logic, low-end battery chargers, and remote sensor nodes. The wide VCC range and industrial temperature rating (-40C to +85C for the -I grade) suit harsh environments. When designing, note that OTP memory cannot be reprogrammed, so firmware must be fully validated before programming. The device has no built-in debug interface; development relies on the ICD header or production programmers, and emulator compatibility should be confirmed via the Microchip compatibility chart (DeviceDoc 00148J2). This page synthesizes current distributor pricing, drop-in alternative candidates, and practical engineering notes beyond what the manufacturer datasheet alone provides.

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PIC16C558-20I/SS - 8-bit OTP MCU 3.5KB EPROM 20MHz SSOP-20 | Microchip
PIC16C558-20I/SS

PIC16C558-20I/SS - 8-bit OTP MCU 3.5KB EPROM 20MHz SSOP-20 | Microchip

The Microchip Technology PIC16C558-20I/SS is an EPROM-based 8-bit CMOS microcontroller from the PIC16C family, integrating 3.5KB of one-time-programmable (OTP) program memory, 128 bytes of RAM, and 13 general-purpose I/O pins in a 20-pin SSOP (Shrink Small Outline Package). The '20' suffix indicates a 20MHz maximum clock, yielding 200ns instruction cycle time, and 'I' denotes the industrial -40C to +85C operating temperature grade. The part operates from 3.0V to 5.5V supply and uses Microchip's RISC instruction set of 35 single-word instructions. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, I/O peripherals, and timers on one silicon die, optimized for embedded control tasks. PIC16C MCUs sit in the hierarchy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. They are widely used in cost-sensitive, low-power applications where deterministic real-time response and a small code footprint outweigh the need for large memory or analog peripherals. The 'C' suffix denotes EPROM-based program memory, distinguishing these from flash-based 'F' variants in the same pinout family. Key features of the PIC16C558-20I/SS include a 200ns instruction cycle (5 MIPS at 20MHz), 8-bit data path, 13 digital I/O pins, one 8-bit timer/counter (TMR0) with optional watchdog, power-on reset, brown-out detection, and an internal RC oscillator option. The device supports in-circuit serial programming (ICSP) for development despite the OTP program memory, which cannot be erased after programming. The architecture uses a Harvard design with separate program and data buses, enabling single-cycle instruction fetch with simultaneous data access. The 14-bit wide program word accommodates the 35-instruction opcode set plus literal data, while the 8-bit data bus handles SRAM access. The industrial-grade silicon supports operation across automotive, industrial, and consumer temperature windows. Typical applications include appliance control, sensor signal conditioning, low-end motor control, LED drivers, battery chargers, and automotive body electronics. The 20MHz clock rate enables timing-sensitive tasks like IR remote decoding, RC servo control, and basic UART bit-banging. The 13 I/O pins can directly drive LEDs, relays, and small solenoids through internal weak pull-ups. Designers must note that OTP memory cannot be reprogrammed, so development requires ICSP with a windowed ceramic package for code iteration or migration to the flash-based PIC16F558 successor. Use a 100nF decoupling capacitor within 5mm of VDD, and ensure MCLR is tied high through a 10k resistor for normal operation. This page synthesizes distributor inventory, parametric drop-in alternatives, and practical design notes that complement the manufacturer datasheet, helping engineers evaluate this legacy OTP MCU for both new designs and existing product maintenance.

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