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PIC16C55-RCE/SO - 8-Bit 4MHz OTP MCU 768B 28-SOIC | Microchip
PIC16C55-RCE/SO

PIC16C55-RCE/SO - 8-Bit 4MHz OTP MCU 768B 28-SOIC | Microchip

The Microchip Technology PIC16C55-RCE/SO is a member of the original PIC16C5x family, an 8-bit RISC-based CMOS microcontroller built around a Harvard architecture with 12-bit wide instructions. It integrates 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, 24 bytes of general-purpose RAM, and 20 digital I/O pins, all in a 28-pin narrow-body SOIC (SO) package. Operating from 3.0V to 6.0V supply at up to 4 MHz, the part is offered in the commercial/extended temperature grade. An OTP microcontroller is a variant of EPROM-based MCU where the program memory can be written exactly once at programming time, after which it behaves like masked-ROM silicon. Compared with flash-based MCUs, OTP parts offer lower per-unit cost at high volume, smaller silicon area, and stronger data retention because there is no charge pump or Fowler-Nordheim tunnel oxide to age. These advantages made the PIC16C5x family ubiquitous in late-1990s and early-2000s appliance, sensor, and consumer products where code stability was final on first programming. The PIC16C55-RCE/SO executes most instructions in a single 250 ns cycle (4 MHz / 4) thanks to a 4-clock-per-instruction core, yielding roughly 4 MIPS peak throughput. The 33-instruction RISC set is highly orthogonal, the 8-level deep hardware stack simplifies interrupt-free subroutines, and the 12-bit instruction width yields a typical 2:1 code density advantage over competing 8-bit CISC MCUs. Two hardware timers (8-bit RTCC + WDT), a Power-On Reset (POR), and brown-out protection are integrated. There is no on-chip ADC, UART, or I2C peripheral; the device is intended as a glue controller in simple digital subsystems. The 28-pin SOIC footprint matches the PIC16C55A and PIC16C55A-EP successors that offer expanded RAM (72 B vs 24 B) and higher oscillator options, allowing PCB-level drop-in migration. Pin 1 (RA2), pin 20 (Vss) and pin 28 (VDD) keep the same port assignments, and the external RC/HS/LP/XT oscillator pins (OSC1 / OSC2 / CLKOUT / CLKIN) remain fixed across the family, easing engineering change orders. Typical applications include washing-machine user-interface boards, dishwasher cycle controllers, microwave oven keypads, hobby servomotor drivers, low-end thermostat logic, fan and pump speed controllers, and PC peripheral front panels. Designers also use it as a supervisor companion next to a host processor - the 20 mA sink/source capability on every I/O pin is sufficient to drive relays through a discrete transistor. A key design consideration: OTP cannot be re-programmed in-circuit. Provision a stable prototype path using a windowed JW or a flash sibling (PIC16F54 in SOIC-28) for firmware iteration, then move to the OTP -RCE/SO for production. The /RC oscillator option (suffix 'RC') allows an external resistor/capacitor timing network and eliminates the cost of a crystal in cost-sensitive designs. This page synthesizes distributor pricing, parametric comparisons against active family members, and practical design notes (oscillator trade-offs, OTP programming flow, migration path to PIC16C55A and PIC16F54) not aggregated in the manufacturer datasheet alone.

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PIC16C55-RCE/SS - 8-Bit 4MHz OTP MCU 768B 28-SSOP | Microchip
PIC16C55-RCE/SS

PIC16C55-RCE/SS - 8-Bit 4MHz OTP MCU 768B 28-SSOP | Microchip

The Microchip Technology PIC16C55-RCE/SS is an 8-bit PIC® 16C-series microcontroller built around the classic Harvard RISC core, operating at a 4 MHz clock speed and packaged in a 28-pin SSOP (5.30 mm body width, 0.65 mm pitch). It integrates 768 bytes of OTP (One-Time Programmable) program memory organized as 512 × 12 bits and 24 bytes of RAM, with 20 general-purpose digital I/O pins, an on-chip Power-On Reset (POR) and Watchdog Timer (WDT). The /SS suffix identifies the SSOP surface-mount variant. An 8-bit OTP microcontroller is a single-chip computer that executes a fixed program burned into non-erasable program memory at the factory. In the broader taxonomy, the PIC16C55 belongs to: microcontroller (MCU) → 8-bit MCU → RISC MCU → PIC16 family → OTP-programmed mid-range MCU → embedded controller. Unlike flash-based MCUs the OTP variant is intended for cost-sensitive, volume production runs where firmware will not be updated in the field, which makes it common in appliance control, automotive subsystems, and disposable/embedded industrial nodes. Key features include 33 single-word instructions, a 12-bit instruction word, two 8-bit I/O ports (Port A and Port B/C depending on revision), a 4 MHz internal-external clock domain, and a programmable WDT for unattended operation. The wide 3.0 V to 6.0 V supply range (typical 5 V) and 4 MHz fOSC let the device target low-power and battery-tolerant designs. Architecturally, the PIC16C55 uses a 14-bit instruction word decoded from a 12-bit program word, separate program and data buses, a small instruction pipeline, and direct register-mapped I/O rather than memory-mapped peripherals. This makes for deterministic cycle timing and very small interrupt latency, which is why PIC16C-series parts have remained popular for hard-real-time control loops. Typical applications include appliance controllers (washing machines, microwave ovens), automotive lighting/relay drivers, HVAC fan and pump controllers, low-end security keypads, simple sensor interface boards, and remote/IR transmitter logic. Engineers also use the PIC16C55 in legacy industrial controls where the OTP-only, no-debug interface is preferred for IP protection. When designing with this part, plan the OTP programming step into the production flow: parts cannot be reprogrammed in-circuit, so a programming adapter (e.g. SSOP-28 to DIP-28) is typically used for batch programming. The lack of in-circuit debug means bench prototypes are usually developed on a flash-equivalent PIC16F5x and ported to PIC16C55 for production. This page synthesizes distributor pricing, drop-in OTP and flash alternatives, programming-adapter guidance, and practical design notes not consolidated in a single place on the manufacturer datasheet.

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PIC16C55-RCI/P - 8-bit CMOS MCU 0.75KB ROM 20 I/O | Microchip
PIC16C55-RCI/P

PIC16C55-RCI/P - 8-bit CMOS MCU 0.75KB ROM 20 I/O | Microchip

The Microchip Technology PIC16C55-RCI/P is a ROM-based 8-bit CMOS microcontroller in the PIC16C5X mid-range family, featuring 0.75 KB of program memory, 24 bytes of RAM, and 20 digital I/O pins housed in a 28-pin PDIP (P) through-hole package. It is specified for the RC oscillator mode (R) at commercial (C) temperature range and ships as an industrial-grade (I) variant, balancing legacy compatibility with extended-temperature operation. A PIC microcontroller is a compact, self-contained computer-on-a-chip that integrates a CPU, non-volatile program memory, working RAM, digital I/O, and one or more timers onto a single die. The PIC16C5X family uses a 12-bit-wide instruction word and an 8-bit data path, achieving roughly 2:1 code compression versus typical 8-bit CISC microcontrollers. Within the broader taxonomy, this part belongs to microcontrollers -> 8-bit MCUs -> embedded controllers -> semiconductors, and serves as a predecessor to the modern flash-based PIC16F family. Key features include an 8-bit real-time clock/counter (TMR0), a two-level hardware stack, direct/indirect/relative addressing, seven or eight special-function hardware registers, and a programmable code-protection bit. The device operates from a wide 2.5 V to 6.25 V supply, supports clock speeds up to 20 MHz (4 MHz RC variant), and offers power-saving Sleep mode with Wake-on-pin-change. The 28-pin PDIP footprint delivers 20 usable I/O lines after reserving VDD, VSS, OSC1, OSC2, MCLR, and the timer-0 pin. The architecture is based on a RISC-style Harvard design with separate program and data buses, enabling simultaneous instruction fetch and operand access. Instruction pipelining overlaps fetch and execute cycles, so most instructions complete in one oscillator cycle except for program branches. The RC oscillator option eliminates the cost of an external crystal or resonator, reducing BOM cost for cost-sensitive appliance, toy, and consumer-electronics designs. Typical applications include appliance controllers, HVAC fan and damper drivers, automotive body-electronics modules, simple sensor signal conditioning, RC servo drivers, and legacy industrial control boards. The wide operating voltage range and industrial temperature grade make it suitable for environments where regulated power and stable thermal behavior are required. When designing with this device, plan for its 2-level stack - deeply nested subroutines will overflow the hardware stack, so engineers typically keep call depth shallow or convert to iterative code. For modern designs, consider migration to the flash-based PIC16F54 or PIC16F57, which offer the same 18-20 I/O count and 28-pin PDIP footprint but provide reprogrammability. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C55-RCI/SO - 8-bit OTP MCU, 768B, 20 I/O, SOIC-28 | Microchip
PIC16C55-RCI/SO

PIC16C55-RCI/SO - 8-bit OTP MCU, 768B, 20 I/O, SOIC-28 | Microchip

The Microchip Technology PIC16C55-RCI/SO is an 8-bit EPROM/OTP-based CMOS microcontroller in the PIC16C5X family, supplied in a 28-pin SOIC (0.295", 7.50 mm width) package. The -RC suffix denotes an industrial-temperature grade part with an RC-oscillator compatible clock architecture, while the /SO suffix indicates the wide-body 28-SOIC surface-mount package. What is a PIC16C5X microcontroller? The PIC16C5X is Microchip's original low-cost, high-performance 8-bit fully-static RISC microcontroller family based on EPROM/OTP (one-time programmable) non-volatile memory. It uses 12-bit-wide instructions with an 8-bit data path, two-level-deep hardware stack, and direct/indirect/relative addressing modes. PIC16C5X devices sit at the foundation of the PIC16 architecture hierarchy (PIC16C5X -> PIC16CXXX -> PIC16FXXX), which has grown into the industry's broadest 8-bit microcontroller portfolio. Key features of the PIC16C55 include 768 bytes of EPROM program memory (per the Microchip parametric listing), 24 bytes of RAM, 20 digital I/O pins, one 8-bit real-time counter (TMR0), and 12-bit instruction words. The device supports operating voltages from 3.0 V to 6.25 V (parametric) and industrial temperature range -40 °C to +85 °C. Clock rates up to 20 MHz are achievable when paired with external crystal or RC oscillator components; internal RC-oscillator compatibility enables low-BOM-count designs. Architecturally, the PIC16C55 uses a single accumulator (W register) RISC engine with 33 single-word instructions. The two-level hardware stack limits nested subroutines but is sufficient for the small control loops typical of embedded appliances. The 8-bit TMR0 with programmable prescaler provides the timing/event foundation for the device; combined with 20 I/O pins, this makes the PIC16C55 well-suited for simple control, sensing, and timing tasks. Typical applications include low-cost consumer appliances, white goods, toys, remote controls, sensor signal-conditioning front-ends, simple LED/keypad interface controllers, and industrial control modules where OTP memory and small footprint are acceptable. Engineers designing modern boards frequently migrate designs to PIC16F5X flash-based parts but retain the PIC16C55-RCI/SO pinout to reuse proven PCB layouts. Design consideration: OTP EPROM cannot be reprogrammed; verify firmware with windowed or JW-package samples before committing to OTP production units. When migrating to flash, note that PIC16F55 derivatives are not always drop-in compatible — confirm pinout and SFR mapping against the Microchip compatibility chart before PCB rework. This page consolidates distributor pricing, cross-reference alternatives drawn from the Microchip PIC16C5X family, and practical design notes not found in the standalone datasheet PDF.

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PIC16C55-XT/P - 8-bit 4MHz OTP MCU 20 I/O 28-PDIP | Microchip
PIC16C55-XT/P

PIC16C55-XT/P - 8-bit 4MHz OTP MCU 20 I/O 28-PDIP | Microchip

The Microchip PIC16C55-XT/P is an 8-bit RISC microcontroller from the PIC16C5X family, operating at up to 4 MHz with 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory and 24 bytes of RAM, housed in a 28-pin PDIP package. It features 20 digital I/O lines, a single 8-bit timer/counter (TMR0), and a two-level deep hardware stack, making it one of the earliest members of Microchip's PIC baseline architecture. A baseline PIC microcontroller (also written PICmicro) is an 8-bit fully-static, EPROM/ROM-based CMOS MCU family defined by a RISC instruction set with 12-bit-wide instructions and 8-bit-wide data paths. The PIC16C5X line sits at the bottom of Microchip's PIC hierarchy: baseline PIC16C5X -> mid-range PIC16 -> enhanced mid-range PIC16 -> PIC18 -> PIC24 -> dsPIC -> 32-bit PIC32. Baseline PICs use a small instruction set, a single 8-bit accumulator (W), and a limited two-level stack, optimized for cost-sensitive embedded control rather than compute throughput. Key features of the PIC16C55-XT/P include 33 single-word instructions, two-level hardware stack, direct/indirect/relative addressing modes, power-on reset, power-saving SLEEP mode, watchdog timer with dedicated on-chip RC oscillator, and programmable code protection. The XT speed grade specifies an external crystal/resonator oscillator range of approximately 100 kHz to 4 MHz, and the device operates from 3.0V to 6.0V (per the family datasheet; 4.5-5.5V typical for full-speed operation). Architecturally, the PIC16C55 uses a Harvard-class memory layout with separate program and data buses, a single working register (W), seven or eight Special Function Registers, and a 7-bit file register map. The 12-bit instruction word yields roughly a 2:1 code compression advantage over comparable CISC 8-bit controllers. There is no hardware multiplier, no interrupt controller, and no in-circuit debugger (ICD) — the baseline family trades features for die size and unit cost. Typical applications include low-cost consumer appliances, sensor signal conditioning, simple motor/relay control, automotive body controllers, and educational/hobbyist designs that target the classic PIC16C5X pinout. The 28-pin PDIP footprint also enables easy breadboard prototyping and windowed CERDIP emulation variants (such as PIC16C55-JW). When designing with this part, allocate one I/O pin for MCLR reset, choose the appropriate oscillator mode (XT for standard crystals), and verify the OTP programming procedure against the Microchip programming specification, because OTP parts cannot be reprogrammed or erased after coding. This page synthesizes distributor pricing, drop-in alternative MPNs, and practical design notes not aggregated on any single distributor or manufacturer page.

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PIC16C55-XT/SO - 8-Bit 4MHz OTP MCU 20 I/O | Microchip | SOIC-28
PIC16C55-XT/SO

PIC16C55-XT/SO - 8-Bit 4MHz OTP MCU 20 I/O | Microchip | SOIC-28

The Microchip Technology PIC16C55-XT/SO is an 8-bit CMOS OTP-based microcontroller from the PIC16C5X family, delivering 4 MHz of CPU performance with 768 bytes of program memory (organized as 512 x 12 words), 24 bytes of RAM, and 20 digital I/O pins, all packaged in a 28-pin SOIC (SO) surface-mount form factor. The "XT" suffix denotes a 4 MHz crystal/resonator oscillator option with internal oscillator calibration, and the "SO" suffix denotes the 7.5 mm body-width 28-lead Small-Outline IC package. What is an 8-bit microcontroller? An 8-bit microcontroller is a single-chip computer that uses an 8-bit-wide data path and executes instructions drawn from on-chip program memory, exposing digital and sometimes analog peripherals for embedded control tasks. The PIC16C5X family sits at the low end of the 8-bit MCU hierarchy - below 16-bit and 32-bit controllers - and is positioned within the broader category of microcontrollers (MCU), embedded processors, and finally integrated circuits. This class of device is optimized for cost-sensitive, deterministic, low-power control applications where 32-bit processing power would be wasted. The PIC16C55-XT/SO features a 12-bit-wide instruction word with an 8-bit-wide data path, two levels of hardware stack, seven or eight special-function hardware registers, direct/indirect/relative addressing modes, and an 8-bit real-time clock/counter (TMR0). Program memory is one-time programmable (OTP) EPROM, which means each device can be programmed only once - making the part ideal for high-volume production runs where reprogramming is unnecessary. The 20 I/O pins each source or sink up to 25 mA, sufficient to drive LEDs, relays, and small solenoids directly without buffering. Typical applications span white goods and appliance controls, simple sensor interfaces, LED display drivers, automotive interior modules (where conditions allow), low-end remote controls, and battery-powered instruments. The device is supported by Microchip's MPLAB development ecosystem, including the MPLAB PM3 universal device programmer for production programming and the original PIC16C5X assembly language toolchain. When designing with the PIC16C55-XT/SO, account for the OTP memory constraint by planning firmware revisions carefully and keeping engineering samples for development. Ensure the XT oscillator's crystal or resonator load capacitors match the manufacturer's specifications, and budget for the 4 MHz instruction-cycle timing margin in real-time control loops. This page synthesizes distributor pricing, OTP-MCU drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C55-XT/SS - 8-bit OTP MCU, 768B, 4MHz, 28-SSOP | Microchip
PIC16C55-XT/SS

PIC16C55-XT/SS - 8-bit OTP MCU, 768B, 4MHz, 28-SSOP | Microchip

The Microchip Technology PIC16C55-XT/SS is an 8-bit CMOS EPROM/OTP-based microcontroller delivering 4 MIPS performance at 4 MHz from a 28-pin SSOP package. It integrates 768 bytes of One-Time-Programmable (OTP) program memory organized as 512 x 12 words and 24 bytes of general-purpose RAM, providing 20 digital I/O pins organized across five ports for embedded control applications. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, program memory, and I/O peripherals on one die. The PIC16C5X family from Microchip Technology belongs to the baseline 8-bit RISC MCU category, which sits within the broader taxonomy of microcontroller -> embedded processor -> semiconductor IC. These devices are designed for cost-sensitive, deterministic real-time control tasks where predictable instruction timing, low power consumption, and small package footprint matter more than raw compute throughput. Key features include a two-level deep hardware stack, 12-bit-wide instruction words with 2:1 code compression versus typical 8-bit CISC architectures, direct/indirect/relative addressing modes, and an 8-bit real-time clock/counter (TMR0). The XT oscillator suffix specifies a standard crystal/resonator frequency range, and the SSOP suffix designates the 0.209-inch (5.30 mm) wide Shrink Small Outline Package. Wide operating voltage and industrial temperature range make this device appropriate for consumer, appliance, and industrial subsystems. Typical applications include appliance controllers, simple sensor interfaces, LED driving, battery chargers, remote controls, and low-end automotive body electronics. The PIC16C55-XT/SS is commonly designed in where a baseline PIC16C5X instruction set, on-chip oscillator support, and small-form-factor SSOP are needed for cost-optimized production runs. When designing with this device, ensure the OTP memory is programmed before final PCB assembly because OTP cannot be erased after programming. Use Microchip's MPLAB PM3 Universal Device Programmer or equivalent production-grade programmer. Verify the crystal load capacitor values against the chosen XT-mode resonator specification, and budget board space for the decoupling network near VDD. This page synthesizes distributor pricing from DigiKey, Mouser, LCSC, and Octopart, plus drop-in alternatives from the Microchip baseline PIC16C5X family and pin-compatible PIC16F successors, alongside practical design notes not consolidated on any single manufacturer page.

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PIC16C55-XTE/P - 8-bit OTP MCU 768B 4MHz 28-PDIP | Microchip
PIC16C55-XTE/P

PIC16C55-XTE/P - 8-bit OTP MCU 768B 4MHz 28-PDIP | Microchip

The Microchip Technology PIC16C55-XTE/P is an 8-bit CMOS RISC microcontroller from the foundational PIC16C5x family, offering 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, 24 bytes of data RAM, and 20 general-purpose I/O lines in a 28-pin PDIP (0.600") through-hole package. It executes instructions at a 4 MHz maximum clock rate, supports an instruction cycle of one quarter of the oscillator period, and operates across the standard commercial temperature range with low power consumption typical of CMOS PIC architecture. Background knowledge: An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/EPROM/Flash/OTP), working RAM, and peripheral I/O on one die. The PIC16C5x family introduced Microchip's now-ubiquitous Harvard RISC architecture and 12-bit-wide instruction word, which delivers roughly 2:1 code compression over competing 8-bit CISC controllers of its era. The PIC16C5x sits within the taxonomy: microcontroller -> embedded MCU -> 8-bit MCU -> CMOS RISC MCU -> PIC16 family -> PIC16C5x sub-family. OTP program memory can be written exactly once by a device programmer (versus EPROM which is window-erasable via UV, or Flash which is electrically erasable), making OTP attractive for low-cost production volumes. Key features of the PIC16C55-XTE/P include its 4 MHz oscillator, 20 mA source/sink per I/O, Power-On Reset (POR), a Watchdog Timer (WDT) with dedicated on-chip RC oscillator, a 8-bit real-time timer/counter (RTCC) with 8-bit programmable prescaler, and an EPROM-based code memory with 100K erase/write cycle endurance. The device operates from 2.5 V to 6.25 V and consumes under 2 mA typical at 5 V/4 MHz. Architecturally, the PIC16C55 uses a 12-bit program counter and a two-stage pipeline, allowing most instructions to execute in a single 250 ns instruction cycle at 4 MHz. The Harvard bus separates 12-bit program fetches from 8-bit data accesses, eliminating von Neumann bottleneck. Its 33 single-word/one-cycle instructions simplify assembly development, and an external RC or crystal oscillator drives the timing domain. Typical applications include low-cost consumer appliances, automotive body controllers, hobby and educational platforms, embedded remote-control transmitters, battery-powered instrumentation, and simple industrial control modules. The 28-PDIP package and through-hole mounting make it friendly for prototype breadboarding and hand-soldered repairs. Designers should note that OTP memory cannot be reprogrammed - firmware bugs require a fresh chip. The XTE speed grade denotes the 4 MHz maximum operating frequency; lower-frequency parts (XT, RC, LP, HS variants) trade speed for power savings. For development, Microchip's baseline PIC16C5x family uses the same MPLAB PM3 programmer mentioned on the product page. This page synthesizes distributor pricing, same-brand and cross-brand drop-in alternatives, and practical design notes not collected in any single manufacturer datasheet.

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PIC16C55-XTE/SP - 8-Bit OTP MCU, 768B EPROM, 20 I/O, SPDIP-28
PIC16C55-XTE/SP

PIC16C55-XTE/SP - 8-Bit OTP MCU, 768B EPROM, 20 I/O, SPDIP-28

The Microchip Technology PIC16C55-XTE/SP is an 8-bit RISC microcontroller from the foundational PIC16C5X family, featuring a 12-bit instruction set and 768 bytes (512 x 12 words) of one-time-programmable (OTP) EPROM program memory in a 28-pin SPDIP (Skinny Plastic DIP) package. Operating from 3.0V to 6.25V supply rails, the device delivers up to 4 MHz maximum clock frequency with 24 bytes of general-purpose SRAM, 20 digital I/O lines, and a 33-instruction opcode set. The PIC16C55-XTE/SP is the Extended Temperature (-40C to +125C), XT (standard resonator/crystal) speed grade variant offered in tube packaging. The PIC16C5X family represents the foundation of Microchip's mid-range 8-bit microcontroller legacy. A microcontroller (MCU) is a single-chip computer containing a CPU, RAM, non-volatile program memory, and peripheral I/O; 8-bit MCUs are used in cost-sensitive embedded applications where simple deterministic control is required. The PIC architecture uses a Harvard structure with separate program and data buses, 12-bit-wide instructions, and a fixed instruction cycle, delivering predictable 4:1 code density and deterministic interrupt latency that are valuable for low-power motor control, sensor signal conditioning, and legacy appliance designs. Key features include a hardware 8-bit timer/counter (TMR0) with an 8-bit programmable prescaler, watchdog timer with dedicated on-chip RC oscillator, power-on reset, brown-out detection, and EPROM-based code storage. The device supports 33 single-word, single-cycle instructions with 2:1 code compression over comparable 8-bit MCUs of its era, and offers direct LED drive capability on all 20 I/O pins (sink/source up to 25 mA per pin). The fully static CMOS design eliminates minimum clock-rate constraints. Typical applications include industrial control subsystems, automotive body electronics (non-safety-critical), appliance control boards, security panel keypads, and educational microcontroller training platforms. Because of its deterministic instruction timing and breadboard-friendly DIP package, the PIC16C55 family is widely used in university curricula and rapid prototyping environments. Modern replacements (PIC16F54, PIC16F57) provide flash memory but require software/firmware rewrites, as the OTP EPROM is not electrically re-programmable. When designing with this OTP MCU, account for the one-time-programmable limitation: firmware revisions require re-masking or new silicon. Allocate 1-2 spare I/O pins for in-system test access, and ensure your oscillator circuit (ceramic resonator or crystal + 22 pF caps) matches the XT speed grade. The /MCLR reset pin must be tied to VDD through a 10 kohm pull-up for reliable operation. This part has been widely cloned and second-sourced, but Microchip originals remain the gold standard for longevity and documentation.

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PIC16C55-XTE/SS - 8-Bit 4MHz OTP MCU, 28-SSOP | Microchip
PIC16C55-XTE/SS

PIC16C55-XTE/SS - 8-Bit 4MHz OTP MCU, 28-SSOP | Microchip

The Microchip Technology PIC16C55-XTE/SS is an 8-bit RISC microcontroller from the PIC16C5X family, housed in a 28-pin SSOP package. It features 768 bytes of One-Time Programmable (OTP) program memory organized as 512 words x 12 bits, 24 bytes of on-chip data RAM, and a maximum operating frequency of 4 MHz in the -XT speed grade. The device integrates 20 programmable digital I/O lines, a Power-on Reset (POR) circuit, a Watchdog Timer (WDT) with its own on-chip RC oscillator, and two 8-bit timer/counters, providing a compact peripheral set for embedded control. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, I/O peripherals, and a clock generator on one die. PIC16C5X devices employ a RISC architecture with only 33 single-word/single-cycle instructions, enabling deterministic execution and low code overhead. Within the broader MCU taxonomy, the PIC16C55 belongs to the 8-bit microcontroller class, sitting between 4-bit legacy controllers and modern 32-bit Cortex-M devices. OTP memory places it in the cost-optimized ROM-based MCU category, suitable for low-to-medium volume production where flash reprogrammability is not required at the IC level. Key features of the PIC16C55-XTE/SS include a fully static CMOS design, 12-bit wide instruction word, 20 bidirectional I/O pins with high-current sink/source capability, and an operating voltage range suitable for 5V systems. The internal RC oscillator option allows clock generation without external components, reducing BOM cost in space-constrained designs. The -XT speed grade supports oscillator frequencies up to 4 MHz, while the Watchdog Timer enhances reliability in unattended or remote installations by resetting the MCU on software lock-up. Typical applications include low-cost consumer appliances, hobbyist and educational embedded platforms, simple motor control loops, security keypad controllers, and industrial sensor interface modules. The compact 28-SSOP footprint also enables retrofit into legacy through-hole designs on adapter PCBs. When designing with this part, verify the OTP programming procedure against the device programmer's supported device list - not all programmers handle PIC16C5X OTP devices natively. Pair the MCU with a 5V regulator and decoupling capacitor network per the datasheet's typical application circuit to ensure stable brown-out behavior. This page synthesizes distributor pricing snapshots, drop-in same-family alternatives sourced from the Microchip cross-reference ecosystem, and practical design notes not aggregated on a single manufacturer page.

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PIC16C55-XTI/SO - 8-bit 4MHz 768B OTP MCU, 28-SOIC | Microchip
PIC16C55-XTI/SO

PIC16C55-XTI/SO - 8-bit 4MHz 768B OTP MCU, 28-SOIC | Microchip

The Microchip PIC16C55-XTI/SO is an 8-bit, fully-static, EPROM/ROM-based CMOS microcontroller in the PIC16C5X family, running at up to 4 MHz and housed in a 28-pin SOIC (SO) wide-body package with industrial operating temperature range (the "I" suffix). It integrates 768 bytes (512 x 12) of one-time-programmable (OTP) program memory, 24 bytes of general-purpose RAM, and 20 digital I/O lines on a RISC instruction set with 12-bit-wide opcodes and 8-bit-wide data path. A microcontroller (MCU) is a single-chip computer that contains a CPU, memory, and peripherals. It belongs to the hierarchy MCU -> microcontroller -> embedded controller -> semiconductor device. The PIC16C5X family pioneered low-cost, high-performance 8-bit RISC control and remains popular for low-cost, deterministic embedded tasks where 8-bit simplicity is sufficient. Key features include a 4 MHz maximum clock rate, two-level deep hardware stack, direct/indirect/relative addressing modes, an 8-bit real-time clock/counter (TMR0), and seven or eight special-function hardware registers. Seven special-function hardware registers on this part optimize instruction decoding and context save/restore for interrupt-free operation. The PIC16C55-XTI/SO uses a Harvard architecture with separate program and data buses, fully static CMOS design allowing clock operation down to DC, and 12-bit wide instructions with 2:1 code compression over typical 8-bit CISC microcontrollers. RISC architecture with 33 single-cycle instructions (PIC16C5X baseline) delivers predictable timing with most instructions executing in one instruction cycle (4 clock periods). The "XT" speed grade designates operation with a standard crystal or resonator oscillator, and "I" designates the industrial -40C to +85C operating range. Typical applications include simple embedded control tasks, low-cost consumer appliances, industrial sensor interfaces, and legacy designs requiring OTP-programmed 8-bit RISC controllers. The 28-pin SOIC wide-body footprint suits through-hole-replacement PCB retrofit projects where a standard 0.3-inch-wide SOIC is acceptable. When designing with this part, ensure your oscillator selection matches the "XT" grade (typically a 4 MHz crystal with two 22-33 pF load capacitors). Use MPLAB PM3 or equivalent device programmer to program the OTP memory only once - if field re-programmability is needed, consider the PIC16F55 Flash variant. The 24-byte RAM limits data buffering, so use of small state machines and polling rather than large stacks is recommended. This page synthesizes distributor pricing, pin-compatible OTP PIC16C5X alternatives, and practical 8-bit design notes not found on the standalone manufacturer datasheet.

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PIC16C55-XTI/SP - 8-Bit 4MHz OTP MCU 768B | 28-SPDIP Microchip
PIC16C55-XTI/SP

PIC16C55-XTI/SP - 8-Bit 4MHz OTP MCU 768B | 28-SPDIP Microchip

The Microchip Technology PIC16C55-XTI/SP is an 8-bit, fully static, EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, operating at up to 4 MHz and packaged in a 28-pin SPDIP through-hole package. It integrates 768 bytes of OTP program memory (512 x 12 words), 24 bytes of data RAM, and 20 general-purpose I/O pins, providing a low-cost entry point for embedded control applications. A microcontroller (MCU) is a single-chip computer that contains a processor core, memory, and programmable I/O peripherals. The PIC16C5X family belongs to the original 8-bit PIC architecture, sitting in the hierarchy: PIC16C5X -> PIC16 family -> PICmicro -> 8-bit microcontroller -> embedded MCU. These parts use 12-bit-wide instructions with an 8-bit data path, achieving roughly 2:1 code compression versus competitive 8-bit MCUs of the same era. The PIC16C5X remains popular for cost-sensitive, low-complexity designs such as appliance controls, sensor interfaces, and hobbyist projects. Key features of the PIC16C55-XTI/SP include a 4 MHz maximum clock, 768B OTP program memory (one-time programmable), 24B SRAM, 20 digital I/O pins arranged across multiple ports, an 8-bit real-time clock/counter (TMR0), a two-level deep hardware stack, and direct, indirect, and relative addressing modes for both data and instructions. Seven or eight special function hardware registers manage peripherals and core state. The industrial temperature grade (-40C to +85C) and through-hole SPDIP-28 form factor make it suitable for legacy, hand-soldered, or ruggedized equipment. Typical applications for the PIC16C55-XTI/SP include simple motor control, LED driving, appliance control boards, sensor signal conditioning front-ends, and educational MCU platforms. The wide operating voltage range and low pin count support battery-powered or wall-powered designs with minimal external components. When designing with the PIC16C55-XTI/SP, remember that OTP memory cannot be reprogrammed - the firmware must be fully verified before burning. In-system programming is not available; a device programmer such as the MPLAB PM3 is required. Provide adequate decoupling (0.1uF ceramic) close to VDD, and reserve unused I/O pins to defined states to minimize current consumption. This page synthesizes current distributor pricing, a drop-in alternative cross-reference matrix, and practical design considerations not consolidated on any single manufacturer page.

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PIC16C55-XTI/SS - 8-bit OTP MCU 768B 24 RAM 20 I/O SSOP28
PIC16C55-XTI/SS

PIC16C55-XTI/SS - 8-bit OTP MCU 768B 24 RAM 20 I/O SSOP28

The Microchip Technology PIC16C55-XTI/SS is an 8-bit CMOS RISC microcontroller from the PIC16C5X family, packaged in a 28-pin SSOP (5.30 mm body width). It integrates 768 bytes (512 x 12) of One-Time Programmable (OTP) EPROM program memory and 24 bytes of general-purpose data RAM, with up to 20 digital I/O pins arranged across multiple ports. The XTI suffix designates the industrial temperature grade (-40C to +85C) and the 4 MHz maximum clock rate, while the /SS suffix confirms the SSOP-28 surface-mount package. An 8-bit microcontroller (MCU) is a small single-chip computer built around an 8-bit data path, integrating a CPU, program memory, data RAM, I/O peripherals, and timers in one package. MCUs sit below microprocessors (MPUs) in the system hierarchy and serve as the embedded decision-makers in appliances, sensors, motor controllers, and many other everyday devices. The PIC16C5X family belongs to the original baseline PIC architecture, sharing the same 12-bit wide instruction word across PIC16C54, PIC16C55, PIC16C56, and PIC16C57 devices, with each successive part offering progressively larger program memory. Key features of the PIC16C55-XTI/SS include a 12-bit instruction set with 8-bit data path, two-level deep hardware call stack, direct/indirect/relative addressing modes, an 8-bit real-time clock/counter (TMR0) with programmable prescaler, and a watchdog timer for reliable unattended operation. The device runs from a 2.5V to 6.25V supply (industrial extended range per PIC16C5X datasheet), supports up to 4 MHz external clock input, and delivers 33 single-word instructions with two-cycle conditional branches. Architecturally, the PIC16C55 uses Harvard-style separate program and data buses, allowing instruction fetch and operand read to occur in a single oscillator cycle. This gives the part a 1 MIPS rating at 4 MHz clock. The CMOS process delivers low power consumption (typical < 2 mA active at 5V/4 MHz, < 1 uA standby) suitable for battery-influenced designs. The 20 I/O pins can source/sink up to 20-25 mA per pin, allowing direct LED drive and small-signal transistor switching. Typical applications for PIC16C55-XTI/SS include simple appliance controllers (coffee makers, fans, blenders), automotive interior accessories, low-end sensor interface boards, educational microcontroller learning kits, and hobbyist / replacement-board designs where the classic PIC16C5X instruction set is already embedded in the firmware. Because the part ships as OTP, it is best suited for low- to medium-volume production runs where mask-ROM cost cannot be justified. When designing with the PIC16C55-XTI/SS, pay close attention to the OTP programming window: once programmed, the bit cannot be erased, so prototype code must be burned into ceramic-windowed PIC16C55/JW parts first. The industrial-temperature XTI grade enables field deployment in unheated enclosures but limits the maximum oscillator to 4 MHz - do not substitute XT or HS grade parts without re-validating timing margins. For new designs, Microchip recommends the flash-based PIC16F54 or PIC16F57 as modern drop-in successors with in-circuit programmability. This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16C55/JW - 8-bit 4MHz 768B EPROM MCU 28-CDIP | Microchip
PIC16C55/JW

PIC16C55/JW - 8-bit 4MHz 768B EPROM MCU 28-CDIP | Microchip

The Microchip Technology PIC16C55/JW is an 8-bit RISC CMOS microcontroller in the PIC16C family, featuring 768 bytes (512 x 12) of UV-erasable EPROM program memory and operating up to 4 MHz. It is housed in a 28-pin ceramic DIP (Side-Brazed Window, JW) package that exposes a quartz window for UV erasure during development and prototyping. The device delivers 20 general-purpose digital I/O lines and 24 bytes of data RAM, targeting simple control tasks where cost and legacy compatibility matter more than peripheral density. A microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, working RAM, and peripheral I/O onto one piece of silicon. The PIC16C5X family is the original baseline architecture of Microchip's PIC line, predating mid-range and enhanced cores. The 12-bit program word width (vs. 14 or 16 bits on later PIC16 families) is the defining trait of this baseline series. Within the power-management / embedded-control taxonomy, the PIC16C55 sits in the hierarchy: MCU -> 8-bit microcontroller -> baseline PIC16C5X family -> UV-EPROM variant. Key differentiating features include the JW windowed ceramic package, which is the only form factor in the family that allows UV erasure - making the part suitable for development, education, and low-volume production where firmware iteration is expected. The 512-word program space, 24-byte RAM, and 12-bit instruction width match every other PIC16C55 speed grade (RC, XT, LP, HS), meaning code is portable across oscillator options. The 20 I/O pins support direct LED drive and simple digital interfacing. Technically, the PIC16C55 uses a Harvard architecture with separate program and data buses, a 2-stage pipeline, and 33 single-word single-cycle instructions. The part is fully static, allowing the clock to be stopped without losing register state. Power consumption is dominated by oscillator choice: an RC oscillator draws roughly 2 mA at 5V/4MHz, while the LP (low-power) crystal option drops active current to well under 1 mA, supporting battery-instrumented designs. There is no internal ADC, no UART, no PWM, and no on-chip oscillator, keeping die area (and price) minimal for simple control loops. Typical applications include educational development platforms, legacy industrial controllers, simple appliance timers, hobby robotics, and replacement boards in equipment originally designed around the PIC16C5X baseline core. The PIC16C55/JW is most often deployed where the engineering team already has code compiled for this architecture or where a UV window is needed during firmware bring-up. Engineers often migrate the JW into a one-time-programmable (OTP) ceramic or plastic DIP variant for production volume. When designing with this part, note that the JW windowed package is not hermetically sealed in the conventional sense; the quartz window requires a UV-erasure socket for re-programming. For volume production, choose the equivalent OTP part (PIC16C55/P or PIC16C55-I/P) once code is final, since the JW package carries a substantial cost premium and reduced mechanical robustness. Designers should also budget for a 4 kohm pull-up on the MCLR reset pin and bypass capacitors within 1 cm of VDD/VSS, per Microchip baseline PIC guidelines.

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PIC16C554-04/P - 8-Bit 4MHz OTP MCU 896B | 18-PDIP | Microchip
PIC16C554-04/P

PIC16C554-04/P - 8-Bit 4MHz OTP MCU 896B | 18-PDIP | Microchip

The Microchip Technology PIC16C554-04/P is a 4 MHz 8-bit CMOS EPROM/ROM-based microcontroller in the PIC16C family, packaged in an 18-pin PDIP through-hole package. It integrates 512 x 14-bit (896 byte) of One-Time-Programmable (OTP) program memory, 80 bytes of RAM, and 13 general-purpose digital I/O pins, and executes one instruction every 200 ns (5 MIPS at 4 MHz oscillator). An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory (ROM/EPROM/Flash/OTP), peripherals, and I/O on one die. The PIC16C5xx family sits at the foundation of Microchip's PIC architecture hierarchy (PIC10/PIC12/PIC16/PIC18/PIC24/dsPIC/PIC32) and is widely used as a cost-optimized general-purpose controller for simple glue logic replacement, sensor interfaces, and consumer/industrial embedded products. Because the program memory is OTP (not re-programmable in-circuit), this family targets low-cost production volumes where firmware is finalized. Key features of the PIC16C554-04/P include: 35 single-word instructions, 12-bit-wide instructions with 8-bit data path, two-level hardware stack, direct/indirect/relative addressing, an 8-bit real-time clock/counter (TMR0) with 8-bit prescaler, watchdog timer with on-chip RC oscillator, power-on reset, power-saving SLEEP mode, 4 MHz oscillator input, CMOS low-power process, and 13 bi-directional I/O pins. Operating voltage range is 3.0 V to 6.0 V, with commercial and industrial temperature grades available. Technically, the PIC16C554 uses a Harvard architecture with separate program and data buses; the 12-bit instruction word allows all instructions to be single-cycle except branches (two cycles). The on-chip watchdog timer with its own internal RC oscillator provides autonomous recovery without external components. The CMOS process gives the part very low standby current and suits it for battery-friendly consumer applications. Typical applications include automotive subsystems (sensor interfaces, simple body controllers), industrial control (timers, counters, simple state machines), low-end consumer appliances, IR remote controls, and white-goods user-interface boards. The 13 I/O pins can directly drive LEDs, scan keypads, or bit-bang simple serial protocols. When designing with this part, note that OTP is one-time programmable; firmware bugs cannot be field-updated. Place a 0.1 µF decoupling capacitor within 5 mm of VDD, and keep the resonator/clock traces short to avoid noise injection into TMR0. Verify the in-circuit programmer (e.g. PICSTART+) supports the OTP window-less variant before committing to production tooling. This page consolidates distributor pricing, drop-in Microchip same-family alternatives, and practical design notes not found in the standalone Microchip datasheet.

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PIC16C554-04/SO - 4MHz 8-Bit OTP MCU | Microchip | SOIC-18
PIC16C554-04/SO

PIC16C554-04/SO - 4MHz 8-Bit OTP MCU | Microchip | SOIC-18

The Microchip Technology PIC16C554-04/SO is an 8-bit CMOS OTP-based microcontroller (MCU) from the PIC16C5x family, running at up to 4 MHz instruction execution in an 18-pin SOIC package. It integrates 896 bytes (512 x 14) of One-Time-Programmable program memory, 80 bytes of RAM, and 13 digital I/O pins with POR and WDT peripherals. An 8-bit microcontroller is a single-chip computer that integrates a CPU, RAM, program memory, and I/O peripherals on one die. Microcontrollers belong to the broader category of microprocessors and processors; the 8-bit class targets low-cost, deterministic, low-power embedded control tasks such as appliance controls, sensor interfaces, and simple user I/O. The PIC16C5x architecture is part of Microchip's PIC RISC family, optimized for compact code (only 35 instructions) and fast interrupt response. Key features of the PIC16C554-04/SO include 200 ns instruction cycle at 4 MHz, 4 MHz maximum operating frequency, 13 bidirectional I/O pins, on-chip Power-On Reset (POR), Watchdog Timer (WDT), and an external oscillator interface. The OTP program memory supports one-time field programming, while the 80 x 8 RAM provides scratchpad data storage. Operating voltage spans 3.0 V to 5.5 V with a commercial temperature grade of 0 C to +70 C. The device uses a Harvard RISC architecture with separate program and data buses, 8-level hardware stack, and 12-bit special-function register file. CMOS static design allows clock frequencies from DC to 4 MHz, and the SOIC-18 (7.50 mm) package is suited for cost-sensitive, surface-mount designs. The 04 speed suffix denotes the 4 MHz grade; -10 and -20 suffixes denote 10 MHz and 20 MHz grades respectively within the same PIC16C554 die. Typical applications include automotive body electronics, industrial control logic, appliance controllers, security system keypads, and general-purpose 8-bit embedded replacement of discrete logic. The wide operating voltage and small package make it a common choice for legacy designs requiring a long-life, pin-stable controller. Design consideration: pair the MCU with a stable external resonator or crystal on OSC1/OSC2, route MCLR with a proper RC reset network, and respect the OTP one-time-program constraint by verifying code in a windowed or flash-equivalent prototype (e.g., PIC16F554) before committing to production. This page synthesizes distributor pricing, drop-in same-family alternatives (PIC16C554-04E/SO, PIC16C554-04I/SO, PIC16C554-20I/SO), and practical design notes not found in the manufacturer datasheet.

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PIC16C554-04/SS - 8-bit OTP MCU 896B EPROM 20SSOP | Microchip
PIC16C554-04/SS

PIC16C554-04/SS - 8-bit OTP MCU 896B EPROM 20SSOP | Microchip

The Microchip Technology PIC16C554-04/SS is an EPROM-based 8-bit CMOS microcontroller that packages the PIC16C5x RISC core into a 20-pin SSOP (Shrink Small Outline Package), combining 200 ns instruction execution with only 35 single-word instructions for compact, deterministic control code. It integrates 896 bytes of EPROM program memory, 80 bytes of RAM, and 13 digital I/O pins, and operates from a 3.0 V to 5.5 V supply at a 4 MHz oscillator rate (the "/04" speed suffix). An 8-bit microcontroller is a single-chip computer that integrates a CPU, RAM, program memory, and I/O peripherals onto one silicon die. Within the semiconductor taxonomy, the PIC16C554 sits in the microcontroller (MCU) family, which itself belongs to integrated circuits (ICs), embedded controllers, and ultimately the broader semiconductor category. Microcontrollers are the workhorses of discrete digital control, replacing discrete logic and relays when firmware flexibility matters more than raw throughput. Key features include 12 I/O pins with individual direction control, an 8-bit timer/counter (TMR0), a watchdog timer with on-chip RC oscillator for reliable recovery, power-on reset, brown-out detection, code protection, and an external interrupt pin. The Harvard RISC architecture separates program and data buses, and the 12-bit wide instruction word keeps the decoder logic compact. Typical applications include appliance control, automotive body electronics, industrial sensor interfaces, low-cost consumer products, and battery-powered instrumentation where the OTP (one-time-programmable) program memory and small footprint minimize bill-of-materials cost. The 20-pin SSOP footprint is also friendly to hand-soldered prototypes and densely packed PCBs. Designers should evaluate whether OTP memory is appropriate for the production volume (OTP is cheaper than flash for very high runs but cannot be reprogrammed), plan for in-circuit programming via the ICSP interface, and confirm that 896 bytes of program memory and 80 bytes of RAM are sufficient for the application. The SSOP package's fine 0.65 mm pitch demands careful PCB land pattern design and reflow profile control.

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PIC16C554-04E/P - 8-Bit OTP MCU, 4MHz, 896B | Microchip
PIC16C554-04E/P

PIC16C554-04E/P - 8-Bit OTP MCU, 4MHz, 896B | Microchip

The Microchip Technology PIC16C554-04E/P is a CMOS OTP-based 8-bit RISC microcontroller in an 18-pin PDIP package, delivering 4MHz maximum clock speed with 896 bytes (512 x 14) of One-Time Programmable program memory and 80 bytes of RAM. It executes instructions in 200ns and uses the simplified PIC instruction set of 35 single-word instructions for compact, deterministic code. The device operates from 3.0V to 5.5V and is specified across the -40C to +125C automotive/industrial temperature range, making it suitable for harsh-environment embedded applications. A microcontroller (MCU) is a single-chip computer containing a CPU, non-volatile program memory, working RAM, and on-chip peripherals. The PIC16C554 belongs to Microchip's PIC16C mid-range family - a RISC architecture where every instruction is a single 14-bit word, allowing high code density and predictable interrupt latency. Within the broader taxonomy, the PIC16C554 sits as: microcontroller -> embedded controller -> 8-bit MCU -> CMOS OTP MCU -> PIC16C family. The 04 speed suffix designates the 4MHz oscillator domain, while the E suffix denotes the Extended (automotive) temperature grade and the /P suffix identifies the PDIP package. Key features include 12 I/O pins with individual direction control, an 8-bit timer/counter (TMR0) with an 8-bit prescaler, a Watchdog Timer (WDT) with its own on-chip RC oscillator, Power-On Reset (POR), Power-Up Timer (PWRT), and code-protection support. The device offers low-power operation and a 25mA source/sink capability per I/O pin for directly driving optoelectronic and other hardware peripherals. The OTP (One-Time Programmable) EPROM cell technology allows rapid prototyping at low cost, but limits the part to single programming - for field-updateable designs consider a Flash-based PIC16F equivalent. Typical applications include automotive body controllers, industrial sensor interfaces, appliance control boards, security alarm panels, and remote-control transmitters. The wide temperature range and high-noise-immunity CMOS process also suit automotive subsystems such as lighting controllers, seat/door modules, and HVAC actuators. Because the PIC16C554 shares pin compatibility with several PIC16C5x siblings, designers can move between PIC16C54/55/56/57 footprints with minimal PCB rework. When designing with this device, note that OTP parts cannot be reprogrammed - production programming must be the final step. Reserve the MCLR, OSC1/OSC2, and VDD/GND pin functions carefully because the 18-pin PDIP is pin-limited and these pins cannot be repurposed as I/O. For low-pin-count modern designs consider the PIC16F54 or PIC12F parts as drop-in Flash alternatives.

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PIC16C554-04E/SO - 8-Bit OTP MCU, 4MHz, 896B EPROM | Microchip
PIC16C554-04E/SO

PIC16C554-04E/SO - 8-Bit OTP MCU, 4MHz, 896B EPROM | Microchip

The Microchip Technology PIC16C554-04E/SO is an 8-bit CMOS EPROM-based microcontroller from the PIC16C5x family, delivering 4 MHz instruction execution (200 ns per instruction) in a surface-mount 18-pin SOIC package. The 'E' suffix denotes the extended automotive temperature grade, and the 'SO' package suffix identifies the 18-pin 300-mil Small Outline IC footprint. The device integrates 896 bytes (512 x 14) of One-Time Programmable (OTP) program memory, 80 bytes of RAM, and 13 digital I/O pins in a RISC architecture with only 35 single-word instructions. An 8-bit OTP microcontroller is a microcontroller whose non-volatile program memory can be written exactly once by the user, typically using an external programmer. OTP MCUs occupy the position between mask-ROM devices (lowest unit cost, highest NVR) and Flash MCUs (re-programmable in-circuit). Within the broader taxonomy, PIC16C554 belongs to: 8-bit MCU -> RISC microcontroller -> Harvard architecture MCU -> embedded controller -> semiconductor. The PIC16C5x core uses a separate instruction and data bus (Harvard architecture) with a 12-bit or 14-bit instruction word, optimizing instruction fetch while data memory is read. Key features include a 4 MHz oscillator, 200 ns instruction cycle, 13 bidirectional I/O pins, an 8-bit timer/counter (TMR0) with 8-bit programmable prescaler, Power-On Reset (POR), Brown-Out Reset (BOR), Watchdog Timer (WDT) with on-chip RC oscillator, and code-protection circuitry. The 18-pin SOIC package supports -40C to +125C (automotive grade 'E') operation with a wide 2.5V to 5.5V supply range. The OTP memory cell uses a one-time-programmable EPROM transistor, providing a non-volatile program store suitable for low-volume and high-reliability applications. The PIC16C554 employs a pipelined RISC core with 35 single-word instructions and a two-level deep hardware stack, executing each instruction in one instruction cycle except for program branches which take two. Peripherals are memory-mapped into the SFR space, and interrupts are handled through a single vector with a context-saving requirement. The architecture is fully static, allowing the clock to be stopped for low-power standby. Typical applications include automotive body controllers, appliance control boards, sensor signal conditioning front-ends, low-cost consumer remote controls, security peripherals, and industrial timer/counter replacements. The wide operating voltage (2.5V-5.5V) and automotive temperature grade make the PIC16C554-04E/SO particularly suited to under-hood and dashboard modules where Flash reprogrammability is not required. When designing with this device, plan for OTP programming early in the production flow because code cannot be modified after programming. For prototype development use the windowed (JW) or Flash siblings first, then port the verified firmware image to the OTP PIC16C554 for production. Reserve the MCLR/Vpp pin for in-circuit serial programming (ICSP) or external reset. This page synthesizes distributor stock levels, parametric compatibility, and engineering design notes not consolidated in the manufacturer datasheet - including practical guidance for OTP migration paths and automotive-grade qualification criteria unique to the 'E' suffix.

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PIC16C554-04E/SS - 4MHz 8-Bit OTP MCU, 20-SSOP | Microchip
PIC16C554-04E/SS

PIC16C554-04E/SS - 4MHz 8-Bit OTP MCU, 20-SSOP | Microchip

The Microchip Technology PIC16C554-04E/SS is an EPROM-based 8-bit CMOS microcontroller from the PIC16C5x family, delivering 4 MHz (200 ns instruction cycle) performance with 896 bytes (512 x 14) of OTP program memory and 80 bytes of RAM, housed in a 20-pin SSOP (5.30 mm body width, 0.65 mm pitch) package. What is an OTP microcontroller? An OTP (One-Time-Programmable) microcontroller is a class of MCU whose program memory can be written only once after manufacture, typically using EPROM cells exposed through a programming window or via ICSP. OTP MCUs sit between fully-mask-ROM parts (lowest unit cost, but require a full production mask) and Flash-based MCUs (re-programmable, higher die cost). They are widely used in cost-sensitive, high-volume consumer and industrial products where firmware is finalized at design lock and re-programmability is not required. Architecturally, the PIC16C554 belongs to the PIC16C family: RISC-based 8-bit core, single accumulator (W), Harvard memory map, 12-bit (or 14-bit for PIC16C55x) instruction width, and 35 single-word instructions. Key differentiating features of the PIC16C554-04E/SS include its 13 general-purpose digital I/O pins, integrated Power-on Reset (POR), Watchdog Timer (WDT) with on-chip RC oscillator, and a wide 3.0 V to 5.5 V operating voltage range (PIC16C554-04 variant). The "E" temperature-grade suffix denotes the -40 °C to +125 °C automotive/extended industrial range, while the "04" speed designator specifies the 4 MHz maximum oscillator frequency. The 20-SSOP package (JEDEC MO-150, 5.30 mm body) provides a low-profile surface-mount footprint with gull-wing leads for high-yield automated assembly. Architecturally, the PIC16C554 uses Microchip's classic PIC RISC core with a two-stage pipeline, dedicated hardware stack (2 levels for this family), and a 14-bit wide instruction word that allows single-cycle opcode fetch and execute. The ALU operates on the working register (W) plus any file register; bit-oriented instructions (BSF, BCF) and byte-oriented instructions provide compact code density. The device has no on-chip oscillator, requiring an external crystal, ceramic resonator, or RC network on OSC1/OSC2. Typical applications include automotive body and chassis ECUs (HVAC controls, seat modules, mirror controllers), white goods and appliance control boards (washing machines, dishwashers, microwave ovens), low-cost consumer electronics (remote controls, toys, small appliances), industrial sensor signal conditioning, and battery-powered instrumentation where the small code footprint and low pin count are advantageous. In many legacy designs, the PIC16C554 continues to be specified because of its long-term firmware stability and Microchip's continued availability through the automotive/extended-temperature supply chain. Design tip: The PIC16C554 has no internal oscillator - the system clock must be supplied externally on OSC1/OSC2. For low-power standby designs, the SLEEP instruction halts the core clock but the WDT can continue running; choose WDT postscaler carefully to balance wake-up latency with current draw. The MCLR reset pin must be pulled high through a resistor for normal operation; a simple RC on MCLR provides a power-on reset delay. This page consolidates distributor pricing, drop-in 20-SSOP alternatives within the PIC16C5x family, and practical design notes that go beyond the manufacturer datasheet's basic specifications.

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PIC16C554-04I/P - 8-Bit 4MHz OTP MCU, 896B, 13 I/O | Microchip
PIC16C554-04I/P

PIC16C554-04I/P - 8-Bit 4MHz OTP MCU, 896B, 13 I/O | Microchip

The Microchip Technology PIC16C554-04I/P is an 8-bit CMOS OTP-based microcontroller in the PIC16C family, delivering 4 MHz maximum clock speed with 200 ns instruction execution in an 18-pin PDIP through-hole package. It integrates 896 bytes of program memory (512 x 14 OTP), 80 bytes of RAM, and 13 digital I/O pins, and operates from 3.0 V to 5.5 V across an industrial temperature window of -40C to +85C. What is a PIC16C OTP MCU? The PIC16C series is Microchip's classical OTP (One-Time-Programmable) 8-bit microcontroller family built on the RISC-based PIC architecture. OTP MCUs ship unprogrammed and are written once with a device programmer, after which the code is permanent. They sit in the hierarchy: MCU -> 8-bit microcontroller -> microcontroller -> embedded control IC. Compared with flash-based PIC16F parts, PIC16C OTP devices are typically used for mature, low-cost, high-volume products where firmware is finalized and code protection plus long-term archival stability matter more than field re-programmability. Key features include a Harvard RISC core executing 35 single-word instructions, a hardware 8-bit timer/counter (TMR0) with optional prescaler, a watchdog timer, power-on reset, brown-out reset, in-circuit serial programming (ICSP), and code protection via EPROM fuses. The 13 I/O pins can wake the core from SLEEP via interrupt-on-change, and the device supports up to 1 mA source / 25 mA sink per pin (per-pin limits require the user to consult the electrical characteristics table). Architecture details: a 14-bit instruction word, two-stage pipeline, 8-bit data path, 7 special-function hardware registers, DC to 4 MHz clock input, and an internal oscillator option on selected derivatives. The 18-pin PDIP is the original PIC16C5x/PIC16C55x package and is still chosen where through-hole insertion, hand prototyping, or hobbyist breadboard compatibility matters. Typical applications include appliance control (white goods, HVAC actuators), automotive body modules (pre-CAN nodes), industrial sensor front-ends, simple user-interface boards with keypads and LED indicators, security panels, low-end consumer devices, and legacy embedded products migrated from PIC16C5x designs where extra code space is required. The wide 3.0-5.5 V supply is convenient for both 3.3 V and 5 V rails. Design consideration: OTP means firmware cannot be updated in the field; finalize code and plan volume production runs before mask commitment. Always reserve ICSP pins (RB6/RB7 on compatible derivatives, or the dedicated ICSPCLK/ICSPDAT pair) so programming is possible after PCB assembly. This page consolidates Microchip datasheet parameters, distributor pricing, drop-in compatible parts in identical PDIP-18 packages, and practical design notes unavailable from a single manufacturer source.

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PIC16C554-04I/SO - 8-bit OTP MCU 896B 4MHz | Microchip
PIC16C554-04I/SO

PIC16C554-04I/SO - 8-bit OTP MCU 896B 4MHz | Microchip

The Microchip PIC16C554-04I/SO is an EPROM/ROM-based 8-bit CMOS microcontroller in the PIC16C family, packaged in an 18-pin SOIC (SO) outline with industrial -40C to +85C temperature grading. The device executes one instruction per 200 ns (5 MIPS at 4 MHz / 5 V) using a 12-bit instruction word and 8-bit data path, backed by 7 or 8 special-function hardware registers and a two-level deep hardware stack. Program memory is 896 bytes (512 x 14) of one-time-programmable (OTP) EPROM with 80 bytes of RAM, and thirteen general-purpose I/O pins are available across the 18-pin package. A microcontroller (MCU) is an integrated circuit that combines a CPU core, program and data memory, and programmable I/O peripherals on a single die. Within the PIC16C series, mid-range PIC MCUs follow a RISC architecture with a small fixed instruction set (here 35 single-word instructions), making firmware easy to develop, debug, and verify. The PIC16C554 sits in the low-cost OTP tier of this hierarchy: PIC16C554 -> PIC16C mid-range MCU -> 8-bit PIC microcontroller -> microcontroller (MCU) -> embedded semiconductor IC. Key features include a 200 ns instruction cycle (5 MIPS at 20 MHz max), on-chip 8-bit timer/counter (TMR0) with 8-bit prescaler, direct/indirect/relative addressing modes for both data and instructions, and a watchdog timer for unattended operation. Power-fail reset and power-on reset are integrated, alongside the configurable I/O ports. The brown-out detect and internal oscillator options present on later PIC16 families are NOT available on this OTP member - designers must rely on the external clock and supply supervision if needed. Typical applications include low-cost appliance controllers, automotive subsystems (non-safety, body-electronics tier), industrial sensor front-ends, and remote-control / HVAC logic modules. The 13 usable I/O pins accommodate matrix keypads, LED drivers, and serial I/O bit-banged protocols. The PIC16C554 is also used as a glue-replacement for legacy 8051 designs where minimum external parts and deterministic interrupt-free logic are preferred. When designing with this part, ensure VDD stays within the 3.0-5.5 V range and provide a stable clock source on OSC1/CLKIN. OTP memory requires a programming step after assembly; designers should plan for socketing or in-system programming to avoid scrapping parts. The PIC16C554 family is mature and is now serviced through Microchip's extended-life OTP roadmap, so lead times should be confirmed before high-volume commitments. This page synthesizes distributor pricing, drop-in alternatives from the same PIC16C family, and practical design notes not consolidated in the manufacturer datasheet.

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PIC16C554-04I/SS - 8-Bit OTP MCU 4MHz 20-SSOP | Microchip
PIC16C554-04I/SS

PIC16C554-04I/SS - 8-Bit OTP MCU 4MHz 20-SSOP | Microchip

The Microchip Technology PIC16C554-04I/SS is an EPROM/OTP-based 8-bit CMOS microcontroller from the PIC16C5xx family, integrating 896 bytes of program memory (512 x 14 words), 80 bytes of RAM, and 13 digital I/O pins in a 20-pin SSOP (5.30 mm body) surface-mount package. It executes instructions in 200 ns (5 MIPS at 20 MHz equivalent) while operating from a 2.5 V to 6.0 V supply, with a 4 MHz maximum oscillator frequency under the "-04" speed grade and an industrial -40C to +85C temperature rating denoted by the "I" suffix. An 8-bit microcontroller (MCU) is a single-chip computer that combines a CPU, RAM, non-volatile program memory, and peripheral I/O on one die. The PIC16C5xx family occupies the low-cost, OTP-programmable tier of Microchip's PIC hierarchy (PIC16C5xx -> PIC16 family -> 8-bit PIC -> microcontroller -> embedded MCU -> semiconductor), targeting high-volume cost-sensitive applications where one-time-programmable memory is acceptable. PIC16C5xx devices share a common RISC core with only 33-35 single-word instructions, allowing assembly-language designs to be ported across the family with minimal effort. Key features include a 12-bit instruction word, an 8-bit data path, a hardware 8-bit timer with 8-bit prescaler, watchdog timer with on-chip RC oscillator, power-on reset, and an internal MCLR reset input. The device uses a von-Neumann memory map and supports direct, indirect, and relative addressing modes. Code protection is selectable via EPROM bits. Typical applications include appliance controls, automotive subsystems (body electronics, lighting), low-end security panels, sensor signal conditioning, and industrial timers/counters. The 13 I/O pins are organized into two ports (PORTA 5 pins, PORTB 8 pins) and can source/sink up to 20 mA per pin, sufficient for direct LED or relay drive. Designers migrating from older PIC16C5x designs can substitute the PIC16C554 directly into existing SSOP-20 PCBs, and firmware compiled for PIC16C55/PIC16C57 generally runs unchanged on PIC16C554 given identical core. Watchdog timer must be disabled in software or cleared periodically if unused. This page synthesizes distributor pricing, drop-in SSOP-20 alternatives, and practical SSOP layout notes that are not in the manufacturer datasheet alone.

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PIC16C554-20/P - 8-bit OTP MCU, 896B EPROM, 13 I/O | Microchip
PIC16C554-20/P

PIC16C554-20/P - 8-bit OTP MCU, 896B EPROM, 13 I/O | Microchip

The Microchip Technology PIC16C554-20/P is an EPROM-based 8-bit CMOS microcontroller in an 18-pin PDIP package. The device delivers 200 ns instruction execution at 20 MHz, contains 896 bytes of EPROM program memory and 80 bytes of RAM, and provides 13 digital I/O pins for general-purpose use. The "-20" suffix denotes the 20 MHz maximum clock and the "/P" suffix designates the through-hole PDIP-18 package. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, I/O peripherals, and timers onto one die. Within the semiconductor hierarchy, the PIC16C554 belongs to the broader MCU category, sits inside the 8-bit RISC class, and is part of the PIC16C5x family of OTP (One-Time-Programmable) EPROM-based devices. EPROM-based MCUs are typically used in mature, low-cost, high-volume applications where the program code is fixed and final, and field re-programmability is not required. Key features include 35 single-word RISC instructions, a 12-bit wide instruction word with 2:1 code compression versus competitors, a fully-static CMOS design, and a wide operating voltage range of 3.0 V to 5.5 V that supports both 3.3 V and 5 V rails. The PIC16C554 also integrates a Watchdog Timer with its own on-chip RC oscillator, power-on reset, power-saving sleep mode, code protection, and selectable oscillator options including RC, LP, XT, and HS modes. Architecturally, the device uses a Harvard-style RISC core with separate program and data buses, eight-level hardware stack, and 12-bit instruction width optimized for code density. Its CMOS EPROM process delivers low operating current (typically a few mA at full clock) and very low standby current, making it well suited to power-sensitive and thermally constrained designs. A real-time interrupt-on-change feature on PORTB plus a 14-bit programmable prescaler simplify event counting and timing without external glue logic. Typical applications include automotive body and chassis subsystems, industrial control and sensor conditioning, low-cost consumer appliances, security and access-control keypads, HVAC fan and damper control, battery chargers, and remote control transmitters. Designers choose the PIC16C554-20/P for proven PIC architecture, deterministic instruction timing, and Microchip's mature toolchain support (MPASM, MPLAB-SIM). When designing with this MCU, pay close attention to the oscillator selection bits: an HS crystal at 20 MHz requires the correct load capacitors and short PCB traces to avoid start-up failures. Code-protect bits must be programmed last in production because once enabled they cannot be un-set without erasing the EPROM window. This page synthesizes distributor pricing, drop-in PIC16C554 family alternatives, and practical design considerations not found in the manufacturer datasheet alone.

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