Circuitos Integrados

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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PIC16C554-20E/P

PIC16C554-20E/P - 8-Bit 20MHz OTP MCU, 896B, 18-PDIP | Microchip

The Microchip Technology PIC16C554-20E/P is an 8-bit CMOS OTP (One-Time Programmable) RISC microcontroller built on the PIC16C architecture, offering 896 bytes of program memory (organized as 512 x 14-bit words), 80 bytes of RAM, and a 20 MHz maximum operating frequency with a 200 ns instruction execution time. Housed in an 18-pin PDIP (Plastic DIP) through-hole package, this automotive-temperature-grade (-40C to +125C) device ships in the -E (Extended) temperature variant and executes a streamlined 35 single-word instruction set. It integrates essential peripherals including a Power-On Reset (POR) and Watchdog Timer (WDT), simplifying firmware bring-up in cost-sensitive designs. An 8-bit PIC microcontroller is a compact, deterministic embedded processor based on a RISC (Reduced Instruction Set Computer) architecture that uses a Harvard memory layout (separate program and data buses) to fetch one instruction per clock cycle. PIC microcontrollers sit within the broader category of microcontrollers, which are single-chip computers containing CPU, RAM, non-volatile program memory, and peripherals. Compared with flash MCUs in the PIC16F family, the PIC16C OTP variants are programmed once at production using a dedicated device programmer and cannot be erased, which lowers per-unit silicon cost for high-volume, code-stable products. Key features of the PIC16C554-20E/P include its 20 MHz maximum clock, 12 I/O pins supporting digital input/output, four interrupt sources, a programmable WDT for runaway code recovery, and an internal POR that initializes the device at power-up. The OTP program memory provides bit-level security through the standard PIC configuration-word fuse set, and the wide 4.5V to 5.5V supply range is matched to regulated 5V industrial rails. The 18-PDIP package exposes all MCU signals to standard 0.1-inch breadboards and through-hole prototype boards, which keeps engineering tooling costs low. The PIC16C554 implements Microchip's PIC16C baseline architecture with a 14-bit instruction word, a single accumulator (W register), and a hardware stack for subroutine calls. With 80 bytes of general-purpose RAM and 12 I/O pins, the device targets glue-logic replacement and sensor-interface tasks rather than connectivity stacks. The automotive temperature grade (-40C to +125C) and CMOS low-power design make it suitable for under-hood and industrial-control environments where EEPROM/flash equivalents would exceed BOM cost targets. Typical applications include automotive body and chassis subsystems (window lift, mirror control, simple sensor conditioning), industrial control (small appliance controllers, pump timers, simple PLC I/O expanders), consumer electronics (remote controls, toy controllers, low-cost appliance user interfaces), and embedded sensor conditioning boards that need deterministic loop timing. The OTP memory and absence of on-chip peripherals like ADC or PWM keep cost minimal for code-fixed logic-replacement tasks. When designing with the PIC16C554-20E/P, plan the firmware code path carefully because OTP cannot be reflashed in the field - any post-production code change requires a new silicon order. Decoupling must include a 0.1 uF ceramic capacitor between VDD and VSS placed within 5 mm of the package, and the MCLR pin requires a pull-up if hardware reset is desired. The automotive-grade -E temperature rating confirms operation from -40C to +125C but does not by itself certify AEC-Q100 - confirm with the manufacturer datasheet for specific OEM qualification. This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C554-20E/SS

PIC16C554-20E/SS - 8-Bit 20MHz OTP MCU 896B | Microchip

The Microchip Technology PIC16C554-20E/SS is an 8-bit CMOS microcontroller from the PIC16C family, featuring a 20 MHz maximum operating frequency, 896 bytes (512 x 14) of One-Time Programmable (OTP) program memory, and 80 bytes of data RAM, housed in a 20-pin SSOP package. It executes one instruction per 200 ns cycle and supports a 35-instruction RISC instruction set. The part operates across the extended automotive temperature range (-40C to +125C) and runs from a 3.0 V to 5.5 V supply, as indicated by the -20E speed/power and -SS SSOP suffix designators. An 8-bit PIC microcontroller is a RISC-based Harvard-architecture computing core optimized for embedded control. The PIC16C family sits at the entry level of Microchip's PIC hierarchy (PIC10/12/16/18/24/32), combining low pin counts (up to 28 pins), small OTP/EPROM program memory, and a minimal peripheral set to provide deterministic, low-cost control logic for simple I/O and timing tasks in cost-sensitive applications. Key differentiating features of the PIC16C554-20E/SS include 13 digital I/O pins, an 8-bit timer/counter with 8-bit prescaler, watchdog timer with on-chip RC oscillator, power-on reset, brown-out detection, and code protection. Its 35 single-word instruction RISC engine simplifies code generation, while the 14-bit instruction word and 8-bit data path deliver predictable interrupt response at 20 MHz. The SSOP-20 footprint (5.30 mm body width, 0.65 mm pitch) makes the device suitable for compact consumer and automotive PCB layouts. Architecture-wise, the PIC16C554 uses Microchip's classic two-stage pipeline, separating program and data buses. OTP memory allows factory or aftermarket programming for production volumes but precludes firmware updates in the field, distinguishing it from the Flash-based PIC16F family. The -20E suffix denotes the 20 MHz, extended-temperature grade. The -SS suffix confirms the 20-pin SSOP gull-wing package, also referenced as 20-SSOP in distributor catalogs. Typical applications include automotive body controllers, appliance control boards, sensor interfaces, simple remote controls, LED drivers, low-end motor control, and replacement of discrete logic in cost-optimized designs. The wide 3.0 V to 5.5 V operating range and automotive-grade temperature span allow direct 5 V regulated rail operation in vehicles and industrial equipment. When designing with the PIC16C554-20E/SS, engineers should note that OTP memory cannot be re-programmed - firmware must be verified before final programming. The part is widely listed as obsolete or last-time-buy across major distributors, so production teams should plan for cross-reference to Flash-based PIC16F equivalents or stockpile remaining inventory. This page synthesizes real-time distributor pricing, parametric drop-in alternatives drawn from Microchip's cross-reference and competitor cross-brand equivalents, and practical design notes that go beyond the manufacturer datasheet's typical-application section.

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PIC16C554-20I/P

PIC16C554-20I/P - 8-Bit 20MHz OTP MCU 896B | Microchip

The Microchip Technology PIC16C554-20I/P is a 200 nanosecond instruction-execution CMOS OTP-based 8-bit PIC microcontroller delivering 20 MHz performance with 896 bytes (512 x 14) of OTP program memory in an 18-pin PDIP through-hole package. The device ships in the industrial temperature grade (-40C to +85C) and is suitable for embedded designs where one-time programmable non-volatile code storage is acceptable. A microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory (here OTP - one-time programmable), and peripherals onto one silicon die. Within the broader hierarchy, the PIC16C554 belongs to the 8-bit microcontroller family, which sits beneath the broader 'microcontroller' hypernym and above the specific PIC16C5xx baseline architecture. OTP variants trade re-programmability for lower unit cost and are commonly used in cost-sensitive, high-volume commercial and industrial products where firmware is finalized at production. Key features include 80 bytes of RAM, 13 digital I/O pins, a 35 single-word instruction set, 200 ns instruction cycle at 20 MHz, and a programmable Watchdog Timer for code-flow integrity. The 8-level hardware stack and Power-on Reset (POR) simplify firmware bring-up, while the in-circuit serial programming (ICSP) interface enables in-field firmware updates before the OTP window is closed. CMOS process technology keeps quiescent current in the microamp range, enabling battery-friendly standby behavior. Typical applications include appliance controllers, automotive body modules (aftermarket and low-speed body), industrial sensor interfaces, security keypads, and small white-goods control boards. Designers select the PIC16C554 when they need a low-cost 8-bit MCU with mature tooling, predictable interrupt latency, and an industrial temperature grade in a through-hole 18-pin package that supports hand-soldering and breadboard prototypes. When designing with this device, budget OTP programming time into your production flow (parallel programming requires ~10-30 seconds per unit depending on the programmer) and ensure the chosen in-circuit programmer supports the C554 die. Avoid using this part for new designs where flash reprogrammability is required - migrate to the flash-based PIC16F54 family instead. This page synthesizes distributor pricing, parametric comparison with same-package PIC16C5x alternatives, and practical design notes not consolidated on the manufacturer datasheet, giving engineers a faster evaluation path for legacy and industrial designs.

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PIC16C554-20I/SO

PIC16C554-20I/SO - 8-Bit 20MHz OTP MCU 18-SOIC | Microchip

The Microchip Technology PIC16C554-20I/SO is a CMOS OTP-based 8-bit RISC microcontroller in the PIC16C family, housed in an 18-pin SOIC (SO) package with industrial temperature grade (-40C to +85C). The device runs at 20 MHz maximum clock, executes instructions in 200 ns, and integrates 896 bytes (512 x 14) of OTP program memory alongside 80 bytes of data RAM. The 'I' suffix confirms industrial temperature grade, while the 'SO' package code denotes the 7.50 mm wide 18-SOIC gull-wing footprint, the same outline used across the PIC16C5x family. An 8-bit microcontroller (MCU) is a small, self-contained computer-on-a-chip that combines a CPU, RAM, non-volatile program memory, and I/O peripherals in a single package. Within the broader IC taxonomy, an 8-bit MCU sits below 32-bit MCUs and microprocessors, but remains dominant in cost-sensitive, deterministic, low-power embedded applications where bit-manipulation efficiency and predictable interrupt latency matter more than raw throughput. The PIC16C5x family was Microchip's first-generation baseline architecture, evolving into the modern PIC16F and PIC18 families still in volume production today. Key features include 13 digital I/O pins, a 12-bit timer/counter (TMR0) with optional external gate, power-on reset (POR), a watchdog timer (WDT) with its own on-chip RC oscillator, and an 8-bit prescaler shared between the timer and watchdog. The OTP program memory enables one-time field programmability, which historically targeted high-volume production runs where mask-ROM economics outweighed flash reprogrammability. The 35 single-word instruction set reduces learning curves for new firmware developers. Typical applications span automotive body controllers, industrial sensor interfaces, simple appliance controls, security alarm panels, low-end consumer electronics, IR remote control transmitters, and battery-powered metering. Designers continue to specify the PIC16C554 in legacy designs because of its long product life, mature toolchain (MPLAB, MPASM, C compilers), and pin-compatible Flash replacements like PIC16F54 and PIC16F57. When migrating firmware, note that the PIC16C554's 12-bit instruction width and 33-instruction opcode are NOT binary-compatible with later PIC16F1xxx or PIC18 instruction sets; assembly source requires rewriting. For new designs, prefer the flash-based PIC16F54 / PIC16F57 family unless OTP cost advantage is decisive.

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PIC16C554-20I/SS

PIC16C554-20I/SS - 8-bit OTP MCU, 20MHz, SSOP-20 | Microchip

The Microchip Technology PIC16C554-20I/SS is an EPROM-based 8-bit CMOS microcontroller from the PIC16C5x family, delivering 20 MHz (200 ns instruction cycle) performance in a 20-pin SSOP package with industrial temperature grade (-40C to +85C). It integrates 896 bytes of EPROM program memory, 80 bytes of RAM, and 13 digital I/O pins. The device uses Microchip's PIC RISC architecture with only 35 single-word instructions to simplify firmware development. An 8-bit OTP (One-Time Programmable) microcontroller is a non-flash, EPROM-based variant of the popular PIC architecture. OTPs sit in the product hierarchy as: microcontroller -> embedded MCU -> 8-bit MCU -> PIC16C5x family. OTP parts are typically chosen for cost-sensitive, high-volume, stable-firmware applications where the program code is finalized and field re-programmability is not required. Compared with Flash-based PIC16F equivalents, OTP devices are usually lower cost per unit and offer slightly better long-term data retention, at the expense of no in-circuit reprogrammability. Key features include a 20 MHz maximum oscillator frequency, 200 ns instruction execution time, 8-bit timer/counter with 8-bit prescaler, watchdog timer with dedicated on-chip RC oscillator, power-on reset, power-saving SLEEP mode, and programmable code protection. The 13 I/O pins support individual direction control and direct LED drive capability (25 mA sink/source per pin), eliminating external driver transistors in many designs. The PIC16C554-20I/SS uses a Harvard-architecture RISC core with separate program and data buses. Its 12-bit instruction word (PIC16C5x baseline family) provides efficient encoding and deterministic timing. The device operates from 2.5V to 5.5V, and the SSOP-20 (5.30 mm body) package supports surface-mount assembly in compact consumer, industrial, and appliance form factors. Typical applications include appliance controllers (washing machines, microwave ovens, coffee makers), battery chargers, remote controls, small motor control, security panels, and low-cost sensor signal-conditioning front ends. The wide operating voltage range and robust I/O drive make it well-suited to white-goods and HVAC subsystems where BOM cost dominates. When designing with this part, note that OTP memory cannot be reprogrammed - firmware bugs discovered after programming cannot be fixed without a new device. For prototypes or designs requiring firmware iteration, choose the Flash-based PIC16F54 or PIC16F57 in the same SSOP-20 footprint instead. A 4 kHz to 20 MHz oscillator or resonator is required, and decoupling must be placed within 1 cm of VDD. This page synthesizes distributor inventory, parametric drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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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

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

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

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