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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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PIC16C554-20E/P - 8-Bit 20MHz OTP MCU, 896B, 18-PDIP | Microchip
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 - 8-Bit 20MHz OTP MCU 896B | Microchip
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 - 8-Bit 20MHz OTP MCU 896B | Microchip
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 - 8-Bit 20MHz OTP MCU 18-SOIC | Microchip
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 - 8-bit OTP MCU, 20MHz, SSOP-20 | Microchip
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 - 8-Bit 20MHz CMOS EPROM MCU 18-CERDIP | Microchip
PIC16C554/JW

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

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 semiconductor IC, and was popular in the 1990s before being superseded by flash-based MCUs that offer in-circuit serial programming without UV erasure.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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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