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PIC16LC54CT-04I/SO - 8-Bit 4MHz OTP MCU, 768B | Microchip
PIC16LC54CT-04I/SO

PIC16LC54CT-04I/SO - 8-Bit 4MHz OTP MCU, 768B | Microchip

The Microchip Technology PIC16LC54CT-04I/SO is an 8-bit OTP (One-Time Programmable) RISC microcontroller in the PIC16C5X family, delivering 4 MHz maximum clock speed with 768 bytes (512 x 12 bits) of program memory and 25 bytes of data RAM, packaged in an 18-pin SOIC (7.50 mm body width). An 8-bit microcontroller (MCU) is a single-chip computer that integrates an 8-bit CPU core, program memory, data RAM, and peripherals such as timers and I/O ports. The PIC16C5X series, introduced by Microchip in the early 1990s, established the PIC (Peripheral Interface Controller) RISC architecture that became foundational for embedded control. It belongs to the broader hierarchy: 8-bit microcontroller -> microcontroller -> embedded processor -> semiconductor IC, and uses a Harvard architecture with separate program and data buses, allowing simultaneous instruction fetch and operand access. This base MCU class underpins millions of low-cost industrial, automotive, and consumer devices where deterministic timing and code simplicity outweigh raw compute throughput. Key features of the PIC16LC54CT-04I/SO include 12 I/O pins (GPIO), Power-On Reset (POR), Watchdog Timer (WDT), and OTPROM program memory that is programmed once and cannot be erased, making the device cost-optimized for high-volume, fixed-function applications. The 'LC' suffix denotes the low-voltage CMOS process variant supporting 3.0 V to 6.25 V operation, and the 'T' indicates tape-and-reel packaging. The 33 single-word instruction set provides deterministic execution, ideal for state machines and timing-critical control loops. Architecturally, the PIC16LC54C uses a 12-bit instruction word, allowing most instructions to execute in a single instruction cycle (4 oscillator clocks), yielding 1 MIPS at 4 MHz. Compared with the original PIC16C54 (which lacked the brown-out reset and configuration bits), the 'C' revision adds oscillator calibration and improved POR behavior. The absence of on-chip debug and Flash means the part is intended for production-only flows where code is finalized before OTP programming. Typical applications include appliance control (washing machines, microwave ovens, coffee makers), HVAC thermostats, security keypads, simple sensor interfaces, and legacy industrial equipment replacements. The wide 3.0 V to 6.25 V supply range suits both 3.3 V logic and 5 V systems directly. When designing with this part, note that OTP memory cannot be re-programmed - firmware must be fully validated on a windowed (JW) or emulator part before OTP programming for production. Provide adequate decoupling (0.1 uF ceramic plus bulk) on VDD and ensure MCLR pin handling matches the chosen reset topology (internal or external). This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.

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PIC16LC54CT-04I/SS - 8-Bit 4MHz OTP MCU, 20-SSOP | Microchip
PIC16LC54CT-04I/SS

PIC16LC54CT-04I/SS - 8-Bit 4MHz OTP MCU, 20-SSOP | Microchip

The Microchip Technology PIC16LC54CT-04I/SS is an 8-bit RISC microcontroller from the PIC16C5X family, featuring a 4 MHz maximum clock speed, 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, and 25 bytes of general-purpose RAM, housed in a 20-pin Shrink Small Outline Package (SSOP). It is designed for cost-sensitive, low-power embedded control applications where deterministic instruction execution and a minimal footprint are required. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral set into one package. The PIC16LC54CT belongs to Microchip's classic baseline PIC16C5X architecture, which uses a RISC instruction set of 33 single-word, single-cycle instructions. Within the broader IC hierarchy, an MCU is a type of embedded processor IC, which itself is a subset of integrated circuits (ICs) used for digital logic and control. MCUs power everything from simple appliance timers to complex automotive body controllers. Key features of this device include 12 bidirectional digital I/O pins, a Power-On Reset (POR) circuit, a Watchdog Timer (WDT) for recovery from code lockup, and an operating voltage range of 3.0 V to 6.25 V suitable for both battery and regulated supplies. The 'C' suffix indicates the OTP variant of the PIC16C54 line, the 'T' suffix denotes tape-and-reel packaging, and the 'I' suffix designates the industrial operating temperature grade of -40C to +85C. The 20-SSOP package provides a compact 5.30 mm body width suited for high-density PCB designs. Architecturally, the PIC16LC54CT-04I uses a Harvard-style separate program/data bus, a 12-bit wide instruction word, and an 8-bit wide data path. The 4 MHz oscillator rating combined with a four-clock-per-instruction cycle yields a 1 MHz instruction throughput. There is no on-chip debugger or interrupt controller, which keeps the silicon small and inexpensive but means all I/O servicing must be polled. Typical applications include low-end consumer appliances, battery-powered sensor interfaces, simple LED driver controllers, replacement of discrete logic gates, and industrial control modules where deterministic timing and minimal BOM cost are paramount. The PIC16LC54CT-04I/SS is well suited to high-volume production runs where OTP programming at the factory is acceptable and field firmware updates are not required. When designing with this part, ensure that the chosen programmer (such as the Microchip PICSTART Plus or MPLAB PM3) supports the OTP device variant. Because OTP memory cannot be erased, code must be fully verified before programming. Decoupling VDD with a 0.1 uF ceramic capacitor placed within 5 mm of the package pin is recommended, and unused I/O pins should be configured as outputs to minimize quiescent current draw. This page synthesizes verified distributor pricing from DigiKey, Mouser, and Octopart; same-brand drop-in alternatives such as the PIC16LC54AT-04I/SS and PIC16LC54C-04I/SS; and practical design notes not found in the standard datasheet summary. All specifications below were extracted directly from manufacturer and distributor sources current as of 2026-09-22.

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PIC16LC554-04/SO - 8-Bit 4MHz OTP MCU, 896B | 18-SOIC | Microchip
PIC16LC554-04/SO

PIC16LC554-04/SO - 8-Bit 4MHz OTP MCU, 896B | 18-SOIC | Microchip

The Microchip Technology PIC16LC554-04/SO is an 8-bit RISC OTP (One-Time Programmable) microcontroller from the PIC® 16C family, featuring a 4 MHz maximum clock input and an 896-byte (512 x 14-bit) EPROM program memory with 80 bytes of RAM, housed in an 18-pin SOIC (Small Outline IC) commercial-temperature-grade package. An 8-bit microcontroller (MCU) is a single-chip computer integrating a CPU, program memory, data RAM, and peripheral I/O on a single silicon die. It belongs to the broader category of microcontrollers -> embedded processors -> semiconductors. The PIC16C5X family, of which the PIC16LC554 is a member, is built on a Harvard architecture with separate program and data buses, allowing instruction fetch and data access to occur in a single instruction cycle (200 ns at 20 MHz, or 1 microsecond at 4 MHz on this part). Only 35 single-word instructions need to be learned, making it one of the simplest MCU families to program in assembly. Key features include 13 programmable digital I/O lines across two ports, a watchdog timer with on-chip RC oscillator for reliable recovery from code faults, a power-on reset (POR) circuit, and an operating voltage range of 3.0 V to 6.25 V from a single supply rail. The "LC" suffix indicates low-power CMOS operation with extended commercial temperature-grade capability, while the "-04" speed grade denotes a 4 MHz oscillator input maximum on this low-voltage part. The 18-SOIC (SO) gull-wing surface-mount package measures approximately 11.7 mm x 7.5 mm with a 1.27 mm pitch. Architecture is a classic 12-bit instruction-word PIC16C5X core with a two-stage pipeline, 8-level hardware stack, and direct/indirect data addressing. With 80 bytes of general-purpose RAM and a 14-bit-wide program word, the part targets simple control loops, sensor interfacing, and human-machine interface (HMI) front panels rather than compute-heavy workloads. In-system emulation is not supported on this OTP variant; development is performed on the windowed CERDIP PIC16C554 JW package. Typical applications include consumer appliance control, simple sensor signal conditioning, replacement of discrete logic in cost-sensitive embedded products, white-goods user-interface boards, low-end remote-control transmitters, and battery-powered instrument panels. The wide 3.0 V to 6.25 V supply tolerance allows direct operation from regulated 5 V rails or two alkaline cells via a low-dropout regulator. When designing with this device, plan for OTP programming: code is committed via a programming fixture and is non-erasable. Allocate sufficient margin in the 896-byte program memory for stack-driven ISRs and library overhead, and use the watchdog timer in any field-deployed product to recover from EMI-induced code mis-execution. This page synthesizes distributor pricing, OTP-only constraint guidance, and pin-compatible drop-in alternatives not found in the manufacturer datasheet summary.

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PIC16LC554-04E/P - 8-Bit OTP MCU 4MHz 896B | Microchip
PIC16LC554-04E/P

PIC16LC554-04E/P - 8-Bit OTP MCU 4MHz 896B | Microchip

The Microchip Technology PIC16LC554-04E/P is an 8-bit CMOS microcontroller from the PIC® 16C family, operating at up to 4 MHz with 896 bytes of One-Time Programmable (OTP) program memory organized as 512 x 14 words and 80 bytes of data RAM. Housed in a 18-pin PDIP (Plastic DIP) through-hole package, it provides 12-13 I/O lines, Power-On Reset (POR), Watchdog Timer (WDT), and an extended operating temperature range of -40C to +125C. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data RAM, and peripheral interfaces into one device. The PIC16LC5X family belongs to the Harvard-architecture 8-bit RISC microcontrollers from Microchip, sitting within the broader taxonomy of microcontroller -> embedded processor -> semiconductor IC. The PIC16LC5X series is positioned as a baseline, OTP-based, low-pin-count family optimized for cost-sensitive and high-volume embedded applications where a single-task program is sufficient. Key features of the PIC16LC554-04E/P include 4 MHz maximum clock speed, 12 special-function registers, a 12-bit instruction word with 33 single-word instructions, a two-stack-level hardware stack, an 8-bit real-time timer/counter with 8-bit prescaler, power-on reset (POR), watchdog timer (WDT) with its own on-chip RC oscillator, and a wide 3.0 V to 6.25 V supply voltage range. The 'LC' prefix indicates the low-voltage CMOS process variant, and the 'E' suffix marks the extended industrial temperature grade (-40C to +125C). The architecture uses a RISC instruction set with single-cycle execution for most instructions (except branches), an internal RC oscillator option, and an EPROM/OTP program memory that is one-time programmable but erasable only by UV exposure (windowed CERDIP variants). The '04' suffix denotes the 4 MHz speed grade, while the '/P' package code denotes the plastic DIP form factor for through-hole PCB assembly. Typical applications include appliance controls, simple sensor interfaces, low-cost consumer electronics, battery-powered timers, and legacy industrial control modules. The PIC16LC554-04E/P is well suited for designs that demand deterministic behavior, small code footprint, and a wide supply-voltage tolerance. Design consideration: because OTP memory cannot be re-programmed in-circuit, design verification on a windowed CERDIP variant (PIC16LC554-04E/JW) is recommended before committing to the OTP plastic-DIP version for production. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, application notes, and design trade-offs that go beyond the manufacturer datasheet summary, helping engineers select the right baseline MCU for cost-sensitive embedded designs.

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PIC16LC554-04E/SO - 8-Bit 4MHz OTP MCU, 896B ROM, 18-SOIC | Microchip
PIC16LC554-04E/SO

PIC16LC554-04E/SO - 8-Bit 4MHz OTP MCU, 896B ROM, 18-SOIC | Microchip

The Microchip Technology PIC16LC554-04E/SO is an 8-bit CMOS RISC microcontroller from the PIC16C5x family, featuring 896 bytes (512 x 14) of one-time programmable (OTP) program memory, 80 bytes of data RAM, and a 4 MHz maximum operating frequency in an 18-pin SOIC wide-body package. Designed for cost-sensitive embedded applications, the device operates from 3.0 V to 6.25 V, delivers 12 I/O pins, and is qualified to the -40C to +125C extended industrial temperature range as indicated by the "E" temperature code. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash/EPROM/OTP), data memory (RAM), and peripheral interfaces onto one IC. The PIC16LC554 falls under the legacy 8-bit PIC baseline architecture, occupying the microcontroller -> embedded controller -> semiconductor device taxonomy. It uses a RISC instruction set with a fixed 12-bit-wide instruction word, where every instruction executes in a single instruction cycle (except branches, which take two), enabling deterministic timing for real-time control loops. Key features of the PIC16LC554-04E/SO include 4 MHz clock speed (the "-04" speed suffix), 13 I/O pins, an 8-bit timer/counter (TMR0) with an 8-bit prescaler, a watchdog timer with its own on-chip RC oscillator for reliable resets, and code protection to prevent unauthorized firmware readback. The device supports both RC and crystal/ceramic resonator oscillator modes, giving designers flexibility for cost-driven oscillator selection. The OTP program memory allows programming once at production time, eliminating the need for a windowed or UV-erasable package and reducing per-unit cost. Architecturally, the PIC16C5x baseline core uses a 12-bit program counter, a two-level deep hardware stack for subroutine calls, and direct/indirect addressing modes. Power consumption is optimized for battery and line-powered applications, with the "LC" low-voltage variant drawing minimal operating current at 3-5 V rails. The 18-SOIC wide-body (0.300 inch / 7.50 mm width) package provides standard through-hole-compatible land patterns for hand-soldered prototyping and production SMT assembly. Typical applications include appliance control (washing machines, microwave ovens, coffee makers), HVAC fan and damper control, simple sensor signal conditioning, battery chargers, security keypads, low-end consumer electronics, and educational/development boards. The extended -40C to +125C temperature range supports under-hood automotive subsystems and outdoor industrial installations. Designers typically pair the PIC16LC554 with discrete MOSFET drivers, op-amps for sensor conditioning, and EEPROM for non-volatile parameter storage. Key design considerations include providing a stable decoupling network (100 nF + 10 uF) near the VDD pin, selecting appropriate MCLR reset circuit components (typically 10 kohm pull-up + diode), and verifying oscillator start-up time across the full temperature range. Engineers upgrading to the Flash-based PIC16F54 family can use the same 18-SOIC footprint and development tools, simplifying field re-programmability. This page synthesizes distributor stock, lifecycle status, drop-in alternatives, and practical design notes that go beyond a manufacturer datasheet re-statement.

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PIC16LC554-04I/P - 4MHz, 0.875KB EPROM MCU, 13 I/O, 18-Pin DIP | Microchip
PIC16LC554-04I/P

PIC16LC554-04I/P - 4MHz, 0.875KB EPROM MCU, 13 I/O, 18-Pin DIP | Microchip

The Microchip Technology PIC16LC554-04I/P is an 8-bit CMOS RISC microcontroller based on the PIC16C5x baseline architecture, delivering 4 MHz CPU performance, 0.875 KB of EPROM program memory, and 80 bytes of RAM in an 18-pin windowed CERDIP through-hole package. It features 12 CMOS-level I/O pins, a 33-instruction instruction set with 12-bit opcodes, and operates from a 3.0 V to 6.25 V supply, making it compatible with both 3.3 V and 5 V system rails. The "LC" prefix denotes the low-power CMOS variant designed for battery-friendly applications, and the "04" speed suffix caps the oscillator frequency at 4 MHz. The "I" temperature grade supports the industrial range of -40 °C to +85 °C, and the "/P" package code designates the plastic DIP form factor. Note that the original /P package is a windowed CERDIP-18, which is suitable for prototype and EPROM-erasable development but is rarely used in high-volume surface-mount production. A PIC16C5x baseline microcontroller is an 8-bit RISC MCU built around a Harvard architecture with separate program and data buses, twelve-bit-wide instruction words, and a 33-instruction set that executes most instructions in a single 1 µs instruction cycle at 4 MHz. In the broader taxonomy, the PIC16C5x sits at the entry level of the PIC10/12/16 baseline and mid-range families, beneath PIC16F mid-range flash MCUs and far below PIC24/dsPIC and PIC32 MIPS-based devices. Baseline PIC MCUs target simple control loops, glue logic replacement, and ultra-low-cost consumer/industrial nodes where deterministic interrupt-free execution and minimal pin count outweigh peripherals. PIC16LC554-04I/P represents the EPROM (erasable windowed) debug-friendly ancestor of today's flash-based PIC16F series and remains useful for legacy firmware maintenance and educational labs. Key features include 80 bytes of general-purpose RAM, a 7-level hardware stack, three I/O ports with individual TRIS direction control, and an internal power-on reset with selectable oscillator options (RC, XT, HS, LP). A watchdog timer with its own on-chip RC oscillator is selectable via configuration bits, along with code-protection and ID-location fuses. The device integrates a 5-channel 8-bit A/D path is NOT present on this baseline part - PIC16LC554 has digital I/O only. Each I/O pin can source or sink 25 mA, enabling direct LED drive, and the device's CMOS design typically draws under 2 mA at 5 V with the watchdog disabled. Typical applications include legacy industrial control boards, simple sensor-interface nodes, EEPROM/flash programmer targets, automotive body controllers from the mid-1990s, hobbyist/educational platforms, and replacement MCUs for end-of-life equipment. The windowed CERDIP package allows UV erasure and reprogramming, which is ideal for development flows but rarely needed in production. When designing with this part, allocate a 4 MHz maximum oscillator, ensure VDD stays within 3.0 V - 6.25 V, and budget for the EPROM programming/verification cycle on first prototype build. Verify that your firmware uses only baseline PIC16C5x opcodes; PIC16F mid-range code is NOT binary-compatible with the baseline core.

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PIC16LC554-04I/SO - 8-Bit 4MHz OTP MCU 896B | Microchip
PIC16LC554-04I/SO

PIC16LC554-04I/SO - 8-Bit 4MHz OTP MCU 896B | Microchip

The Microchip Technology PIC16LC554-04I/SO is a low-power, EPROM-based 8-bit CMOS microcontroller built on Microchip's PIC16C5x baseline RISC architecture, delivering 4 MHz maximum operating frequency in an 18-pin SOIC package. According to the manufacturer datasheet, the device integrates 896 bytes (512 x 14) of One-Time-Programmable (OTP) program memory and 80 bytes of data RAM, while offering 12 or 13 programmable digital I/O lines depending on configuration. A microcontroller (MCU) is a single-chip computer containing a CPU core, non-volatile program memory (ROM/EPROM/Flash), volatile data memory (RAM), and configurable peripheral I/O. Within the broader taxonomy, an MCU belongs to the semiconductor > integrated circuit > microcontroller category. The PIC16C5x family uses a Harvard RISC architecture with only 33 single-cycle instructions, enabling deterministic 200 ns instruction execution at 4 MHz. PIC microcontrollers are widely used in embedded control applications where deterministic timing, low power, and a small footprint matter more than raw computational throughput. Key features include 4 MHz maximum clock, 33 single-cycle RISC instructions (except program branches which take two cycles), 12-13 bidirectional I/O ports, an integrated watchdog timer for fault recovery, a power-on reset circuit, and an operating voltage range of 3.0 V to 6.25 V suitable for both 3.3 V and 5 V systems. The 'LC' prefix denotes the low-power CMOS variant optimized for battery-powered applications, while the 'I' suffix in the part number indicates the industrial operating temperature range of -40 °C to +85 °C. The device is offered in a 300-mil 18-pin SOIC package and is supplied in tube or tape-and-reel format. The PIC16LC554-04I/SO is built on Microchip's proven baseline PIC16C5x core, which uses a 12-bit instruction word and a separate data-memory bus. Its EPROM-based program memory allows one-time in-system programming via standard device programmers, making it well suited for low-to-medium volume production runs where mask-ROM programming economics are not justified. Internal peripherals include a watchdog timer with on-chip RC oscillator, a power-on reset generator, and a software-controlled SLEEP mode for ultra-low standby current. Typical applications include appliance controllers, sensor signal conditioning front-ends, automotive body electronics (non-safety subsystems), HVAC thermostat controls, simple PWM-driven lighting controllers, and battery-powered handheld instruments. The wide 3.0 V to 6.25 V supply range makes the part adaptable to both 3.3 V and 5 V rails common in industrial embedded designs. When designing with this part, engineers should note that program memory is OTP (one-time programmable), so firmware must be fully validated before production programming. The 4 MHz maximum clock limits computational throughput compared to PIC16F-series or PIC18F alternatives, so the device is best suited to control-loop tasks rather than DSP or communication protocol stacks. This page synthesizes distributor pricing, drop-in alternative MPNs, parametric comparison data, and practical design notes not found in the standalone manufacturer datasheet.

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PIC16LC554T-04/SO - 4MHz 8-bit OTP MCU, 896B ROM, SOIC-18 | Microchip
PIC16LC554T-04/SO

PIC16LC554T-04/SO - 4MHz 8-bit OTP MCU, 896B ROM, SOIC-18 | Microchip

The Microchip Technology PIC16LC554T-04/SO is an 8-bit RISC microcontroller from the PIC16C5x family, offering 896 bytes of one-time-programmable (OTP) program memory organized as 512 x 14, 80 bytes of RAM, and 13 I/O pins in a surface-mount 18-pin SOIC package on tape-and-reel. It operates at 4 MHz with a 2.5 V to 5.5 V supply range and integrates Power-On Reset (POR) and Watchdog Timer (WDT) peripherals. The "LC" prefix denotes a low-power CMOS variant suitable for battery-friendly designs, while the "T" suffix denotes tape-and-reel packaging. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral set on one silicon die. Within the broader semiconductor hierarchy, an MCU belongs to the digital logic and embedded-control category, alongside microprocessors, DSPs, and FPGAs. The PIC16C5x baseline architecture uses a 12-bit instruction word and a Harvard structure with separate program and data buses, making it one of the simplest PIC families - ideal for cost-sensitive and pin-constrained embedded tasks such as appliance control, sensor interfacing, and simple state machines. The PIC16LC554T-04/SO delivers 33 single-word instructions with a two-stage pipeline and 2-cycle branches, providing predictable 1 us instruction execution at 4 MHz. Its 13 bidirectional I/O pins are arranged on PORTB for digital input/output, with high-current sink/source capability suitable for driving LEDs and small relays directly. The integrated Watchdog Timer and Power-On Reset reduce external component count, while the OTP program memory allows rapid prototyping before committing to a masked-ROM or Flash derivative. The "LC" device operates across the extended industrial temperature range of -40 C to +85 C. Typical applications include low-cost consumer appliance controllers, LED drivers, remote-control transmitters, sensor signal conditioning front-ends, and battery-powered instruments. The 18-pin SOIC package balances board density and hand-soldering convenience, while the LC variant's lower quiescent current extends battery life in always-on products. Where flash reprogrammability is required, designers can substitute the PIC16F554 family, which is pin- and tool-compatible. When designing with this device, ensure decoupling capacitors are placed within 5 mm of VDD and use a 4 MHz ceramic resonator with internal oscillator mode. Verify OTP programming margin during prototype builds, as OTP memory cannot be erased - this part is intended for volume production where the program is fixed at the factory. For development, Microchip recommends the PIC16F554 equivalent with Flash memory. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that are not consolidated on any single manufacturer or distributor product page.

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PIC16LC554T-04E/SO - 8-Bit 4MHz OTP MCU 896B | Microchip
PIC16LC554T-04E/SO

PIC16LC554T-04E/SO - 8-Bit 4MHz OTP MCU 896B | Microchip

The Microchip Technology PIC16LC554T-04E/SO is an 8-bit OTP microcontroller belonging to the PIC16C family, operating at up to 4 MHz and housed in an 18-pin SOIC package. It integrates 896 bytes of program memory (organized as 512 x 14 words), 80 bytes of RAM, and 13 general-purpose I/O pins. The 'LC' prefix indicates a low-voltage CMOS variant supporting 3.0 V to 6.25 V operation, and the 'T' suffix denotes tape-and-reel packaging, while '04' specifies the 4 MHz maximum clock speed and 'E' denotes the enhanced temperature grade. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, volatile data memory, and configurable I/O peripherals. The PIC16C family uses a RISC-based Harvard architecture with a 14-bit instruction word. Within the broader system hierarchy, this device sits as: microcontroller -> embedded processor -> semiconductor IC. The PIC16LC554 specifically targets cost-sensitive, low-pin-count embedded applications where the OTP (One-Time-Programmable) memory model is appropriate for high-volume production runs without firmware updates. Key features include a 4 MHz maximum operating frequency, 33 single-word instructions, 2-level hardware stack, 8-bit timer/counter, watchdog timer (WDT) with on-chip RC oscillator, power-on reset (POR), and selectable oscillator options (RC, XT, LP, HS). The device operates across the extended industrial temperature range of -40 °C to +125 °C and is built on Microchip's CMOS process technology for low power consumption. With 13 bidirectional I/O pins, the device can interface directly to LEDs, buttons, simple sensors, and serial communication peripherals implemented in firmware. The architecture combines a single accumulator (W register) with a memory-mapped I/O structure and 12-bit special function register addressing, allowing efficient C and assembly development. The enhanced PIC16C5X core shares its instruction set with the PIC16C54/55/56/57/58 family, providing software compatibility for code migration across 18-pin to 40-pin PIC16C5X devices. The LC variant specifically targets battery-powered and portable designs with its wide 3.0 V to 6.25 V supply range. Typical applications include consumer appliance controls, battery chargers, remote controls, LED lighting controllers, simple sensor signal conditioning, low-end motor control, automotive body electronics sub-modules, and industrial timer/counter modules. The OTP memory and small footprint make it ideal for high-volume cost-optimized products. When designing with this device, consider that OTP parts cannot be firmware-updated after programming - validate firmware thoroughly before mask programming. Provide adequate decoupling (100 nF ceramic near VDD) and reserve MCLR pin handling for reliable in-circuit programming. This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a faster path from selection to prototype.

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PIC16LC554T-04E/SS - 8-Bit 4MHz OTP MCU, 20-SSOP | Microchip
PIC16LC554T-04E/SS

PIC16LC554T-04E/SS - 8-Bit 4MHz OTP MCU, 20-SSOP | Microchip

The Microchip Technology PIC16LC554T-04E/SS is an 8-bit RISC microcontroller from the PIC16C5X family, featuring 4 MHz maximum clock speed, 896 bytes of OTP program memory (512 x 14 words), and 80 bytes of data RAM, housed in a 20-pin SSOP package with tape-and-reel packaging. It operates from a supply voltage range of 3.0 V to 6.25 V (3.3 V/5 V typical) and exposes 12 to 13 I/O pins for general-purpose digital interfacing. The 'T' suffix denotes tape-and-reel delivery, the '-04' designates the 4 MHz speed grade, and the 'E' suffix indicates an enhanced or specific revision silicon step. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (ROM/RAM), and peripherals on one die. The PIC16C5X family uses Microchip's original 12-bit instruction word RISC architecture, designed for low-cost, deterministic embedded control. Within the broader taxonomy, an 8-bit MCU belongs to the microcontroller family, itself a subcategory of microprocessors and semiconductors. Compared with 16-bit and 32-bit MCUs, 8-bit parts trade raw computational throughput for simplicity, predictable interrupt latency, and very low cost-per-pin, making them ideal for high-volume appliance, industrial, and automotive sub-system designs. Key features of the PIC16LC554 include 4 MHz operation, 896 bytes (512 x 14) of One-Time-Programmable (OTP) program memory, 80 bytes of RAM, 13 I/O pins, and the special-function peripherals characteristic of the PIC16C5X family: Power-on Reset (POR), Power-up Timer (PWRT), Oscillator Start-up Timer (OST), and a Watchdog Timer (WDT). The architecture uses a 12-bit instruction word with single-cycle execution on most instructions except branches, providing deterministic timing for control loops. The device is fabricated on a CMOS process optimized for low power dissipation and wide supply tolerance. Its RISC core executes 33 single-word instructions and supports 8-bit data paths with a hardware accumulator and a multi-source interrupt structure. Program memory is OTP, meaning each device is programmed once at production time and cannot be field-updated; designers use windowed or UV-erasable CERDIP samples for prototype development. Typical applications include white-goods and appliance control, automotive body electronics, sensor signal conditioning, low-end user-interface panels, battery chargers, and simple closed-loop motor or valve controllers. The 20-SSOP footprint and 13 I/O make it well suited to compact through-hole-replacement designs migrating from older 16C54/16C55 generations. Designers should note that OTP program memory cannot be reprogrammed in-circuit; for prototyping, use the JW (windowed CERDIP) variant. The 4 MHz clock ceiling limits instruction throughput to approximately 1 MIPS, so reserve this MCU for control tasks rather than DSP or high-bandwidth communication. Ensure the chosen oscillator mode (RC, XT, LP, HS) matches the resonator and load capacitance specified in the datasheet electrical characteristics table. This page synthesizes distributor pricing, drop-in alternatives from the same PIC16C5X family, application-specific recommendations, and practical design notes not found in the manufacturer datasheet alone.

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PIC16LC554T-04I/SO - 8-bit 4MHz OTP MCU 896B | Microchip
PIC16LC554T-04I/SO

PIC16LC554T-04I/SO - 8-bit 4MHz OTP MCU 896B | Microchip

The Microchip Technology PIC16LC554T-04I/SO is an 8-bit RISC PIC microcontroller with 896 bytes of one-time programmable (OTP) program memory organized as 512 x 14 bits, 80 bytes of RAM, and 12 I/O ports, operating at 4 MHz from a 3.0 V to 6.25 V supply in an 18-pin SOIC package on tape-and-reel. This PIC16C5X baseline-family member delivers a compact instruction set optimized for deterministic control, including 33 single-word/cycle instructions and a 12-bit wide opcode. An 8-bit PIC microcontroller is a class of CMOS RISC microprocessor that integrates CPU core, non-volatile program memory (ROM/EPROM/OTP/Flash), data RAM, working registers, and programmable I/O into a single chip. Within the broader taxonomy, PIC MCUs sit under microcontroller (MCU) -> embedded processor -> semiconductor IC. The PIC16C5X baseline architecture is the entry-level tier in Microchip's PIC portfolio, optimized for cost-sensitive, deterministic, low-to-medium complexity embedded control where every cycle must be predictable. Key features include a 4 MHz oscillator, hardware reset, watchdog timer, power-on reset, and 12 bidirectional I/O lines multiplexed with peripheral functions. The 8-bit-wide data path, 7-level hardware stack, and 12-bit instruction word yield compact code density typical of baseline PIC silicon. The 'LC' voltage class explicitly targets low-voltage operation down to 3.0 V, distinguishing it from the 4.5 V-minimum PIC16C554 and from PIC16F flash-equipped variants. The PIC16LC554T-04I/SO uses a RISC Harvard architecture with separate program and data buses, allowing simultaneous instruction fetch and operand access. Its 2-level deep stack and 25-byte register file limit interrupt depth but maximize interrupt response predictability. The 'T' suffix in the MPN denotes tape-and-reel packaging; '-04' denotes 4 MHz maximum clock; the 'I' suffix indicates the industrial operating temperature range of -40C to +85C; 'SO' denotes 18-pin SOIC. Typical applications include appliance control, security-system keypads, simple sensor interfaces, low-end consumer electronics, hobby/educational projects, and any cost-constrained embedded design that benefits from a stable, well-documented 8-bit platform with mature toolchain support. The wide 3.0-6.25 V input range makes it compatible with both 3.3 V and 5 V system rails. When designing with the PIC16LC554T-04I/SO, account for OTP (one-time programmable) limitations: firmware cannot be field-upgraded after programming. Plan code carefully, leave margin for late-stage feature additions, and consider PIC16F flash alternatives (e.g. PIC16F505, PIC16F506) for prototypes or designs requiring firmware iteration. The 80-byte RAM budget is tight by modern standards - favor compact variables and reuse register banks. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers quickly evaluate whether the PIC16LC554T-04I/SO fits their application or whether a flash-based successor is a more appropriate choice.

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PIC16LC554T-04I/SS - 4MHz 8-Bit OTP MCU, 12 I/O | Microchip
PIC16LC554T-04I/SS

PIC16LC554T-04I/SS - 4MHz 8-Bit OTP MCU, 12 I/O | Microchip

The Microchip Technology PIC16LC554T-04I/SS is an 8-bit RISC microcontroller from the PIC PIC® 16C family, featuring 896 bytes of OTP program memory (512 × 14) and operating at a clock speed of 4 MHz. Housed in a 20-pin SSOP (Shrink Small Outline Package), this IC targets low-power embedded control applications requiring compact footprints and industrial-grade temperature performance. According to verified distributor data, the device supports a supply voltage range of 3V to 6.25V, 12 I/O ports, and is qualified for industrial temperature range operation. What is a PIC16C microcontroller? The PIC16C family is Microchip's classic 8-bit Harvard-architecture RISC microcontroller lineage, characterized by separate program and data buses, a small instruction set, and OTP (One-Time Programmable) or UV-erasable program memory. PIC microcontrollers occupy the broader taxonomy of microcontrollers -> microprocessors -> semiconductor ICs -> embedded computing. They are widely deployed in applications requiring deterministic timing, low power consumption, and minimal external component count, ranging from appliance controls to industrial sensor interfaces. Key features of the PIC16LC554T-04I/SS include 80 bytes of RAM (per Mouser listing), a 4 MHz maximum clock frequency, an operating range from -40°C to +85°C (industrial grade), and OTP program memory for one-time firmware programming. The 20-SSOP package enables compact PCB layouts, while the 12 I/O ports support peripheral interfacing including timers, comparators, and digital I/O. The PIC16LC554T-04I/SS uses a RISC instruction set with a two-stage pipeline architecture, executing most instructions in a single clock cycle. The OTP memory architecture supports 512 × 14-bit word program storage, suitable for small-footprint firmware routines. The 8-bit accumulator-based core provides straightforward programming via Microchip's MPLAB X IDE and XC8 compiler toolchain, making it accessible for legacy design migration and new low-cost embedded designs. Typical applications include industrial control systems, appliance controllers, sensor interface modules, low-power IoT edge nodes, automotive accessory controls, and embedded timing circuits. The device's 4 MHz clock and OTP memory make it particularly suited for cost-sensitive, high-volume production runs where firmware is finalized at manufacturing time. When designing with this device, ensure proper decoupling with 0.1 µF ceramic capacitors near VDD, and verify that the OTP programming procedure follows Microchip's specified algorithm. The 20-SSOP package requires careful PCB layout to maintain signal integrity for the 12 I/O pins. This page synthesizes distributor pricing, package-aware drop-in alternatives, and practical design notes not aggregated in the manufacturer datasheet alone, providing procurement and engineering teams a single-source reference for evaluating this legacy PIC16C OTP MCU.

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PIC16LC558-04/P - 8-bit OTP MCU 3.5KB 4MHz 18-DIP | Microchip
PIC16LC558-04/P

PIC16LC558-04/P - 8-bit OTP MCU 3.5KB 4MHz 18-DIP | Microchip

The Microchip PIC16LC558-04/P is an 8-bit RISC microcontroller from the PIC® 16C family with 3.5KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 13 I/O pins, housed in an 18-pin PDIP (0.300", 7.62mm) through-hole package. It operates from a 3.3V or 5V supply at a maximum clock of 4MHz and is rated for the commercial temperature grade. An 8-bit microcontroller (MCU) is a small computer-on-a-chip integrating a CPU, program memory, data RAM, I/O peripherals, and timers on a single die. Within the broader taxonomy, the PIC16LC558 sits in the hierarchy: PIC16C-series OTP MCU -> PIC16 family -> 8-bit PIC microcontroller -> Microchip MCU -> microcontroller -> embedded processor -> semiconductor. The "L" in the prefix denotes a low-power CMOS variant optimized for battery and energy-constrained designs, while the "C" indicates One-Time-Programmable (rather than UV-erasable) EPROM technology. Key features include a Harvard RISC architecture with a 14-bit instruction word, single-cycle instruction execution except for branches, a 4MHz oscillator input, an 8-bit timer/counter (TMR0), a Watchdog Timer with its own on-chip RC oscillator, Power-on Reset, Brown-out Detection, and In-Circuit Serial Programming™ (ICSP™). The 13 I/O pins support individual direction control, weak pull-ups via OPTION_REG, and direct LED drive capability on PORTA and PORTB. The OTP memory is programmed once via ICSP and cannot be erased, making this part economical for high-volume production where firmware is final. Typical applications include appliance controls, sensor signal conditioning front-ends, automotive body controllers (non-safety), industrial timers, low-cost remote controls, and small user-interface panels. The 13 I/O pins and 128-byte RAM are sufficient for state-machine-based control loops, simple keypad scanning, and driving multiplexed 7-segment LED or character LCDs without external logic. When designing with the PIC16LC558-04/P, observe the 4MHz maximum oscillator frequency at 5V (lower at reduced VDD), provide a 100nF decoupling capacitor within 10mm of VDD, and use a bulk 10-100uF capacitor on the supply rail. The 18-pin PDIP footprint is the through-hole industry standard, enabling hand-soldering, breadboard prototyping, and easy firmware rework.

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PIC16LC558-04/SO - 8-Bit 4MHz OTP MCU 3.5KB | Microchip
PIC16LC558-04/SO

PIC16LC558-04/SO - 8-Bit 4MHz OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16LC558-04/SO is an 8-bit CMOS microcontroller from the PIC® 16C family, featuring 3.5KB (2K x 14) of One-Time Programmable (OTP) program memory, 128 bytes of RAM, and 13 general-purpose I/O pins in a surface-mount 18-pin SOIC package. The device operates at a maximum clock frequency of 4 MHz across a 2.5 V to 5.5 V supply range and is rated for commercial 0 °C to +70 °C operation, with a low-power "LC" process variant that drops quiescent current relative to the standard PIC16C558. An 8-bit microcontroller (MCU) is a single-chip processor that integrates a CPU, non-volatile program memory, working RAM, and peripheral I/O on one die. PIC16 microcontrollers are RISC-based Harvard-architecture devices: program memory and data memory use separate buses, and most instructions execute in one instruction cycle. The 16C sub-family specifically uses EPROM/OTP non-volatile memory rather than Flash, which historically made these parts cost-effective for low-volume or legacy products. Within the broader taxonomy, the PIC16LC558 sits under: PIC16 -> PIC16C sub-family -> PIC16LC5xx baseline series -> 8-bit microcontroller -> embedded MCU -> semiconductor IC. Key features include 13 digital I/O, a Watchdog Timer with on-chip RC oscillator, Power-on Reset, Power-up Timer, and code protection. The architecture supports 33 single-word instructions with a 12-bit instruction word, a 14-bit wide program-memory bus, and interrupt handling for peripheral events. An 8-bit Timer/Counter0 with programmable prescaler is included. Typical applications include consumer appliances, low-end remote controls, sensor interface modules, simple motor control, and replacement of discrete logic in legacy embedded designs. The 4 MHz ceiling suits bit-banged protocol and polling loops rather than high-throughput DSP. Design tip: OTP memory cannot be re-programmed in-circuit; confirm firmware with a windowed or Flash equivalent (e.g., PIC16F or PIC16C558 JW) before committing to the OTP die. Also budget decoupling — a 0.1 µF cap close to VDD pin 14 and a bulk cap on VSS are mandatory. This page synthesises distributor stock and pricing, drop-in alternatives in the same SOIC-18 footprint, and practical design notes not consolidated in the manufacturer datasheet.

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PIC16LC558-04E/P - 4MHz 8-Bit OTP MCU 3.5KB | Microchip
PIC16LC558-04E/P

PIC16LC558-04E/P - 4MHz 8-Bit OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16LC558-04E/P is an 8-bit RISC microcontroller from the PIC16C family, featuring 3.5KB (2K x 14) of One-Time Programmable (OTP) program memory and 128 bytes of RAM in an 18-pin PDIP through-hole package. Operating from a 3.0V to 5.5V supply, the LC variant denotes the low-voltage CMOS process, with the 'L' indicating low-power operation and the 'C' suffix signifying the CMOS baseline. The device runs at 4MHz maximum clock and is rated for the automotive temperature grade (-40C to +125C). A microcontroller (MCU) is a single-chip computer containing a CPU, memory (program + data), and peripherals such as timers, I/O, and communication interfaces. The PIC16LC558 belongs to the Microchip mid-range PIC architecture hierarchy: MCU -> 8-bit PIC -> PIC16C family -> PIC16LC5xx subfamily. This product type is a classical OTP-based Harvard-architecture device aimed at cost-sensitive embedded control applications where reprogrammability is not required. Key features include 3.5KB OTP program memory, 128 bytes RAM, 13 I/O pins, 1 8-bit timer and 1 Watchdog Timer, 4-channel 8-bit ADC, and power-on reset. The device operates at 4MHz and provides low-power consumption typical of LC-series PIC MCUs. The OTP memory is one-time programmable but supports verification before final programming, making the part suited to high-volume production. The PIC16LC558 uses a RISC-based Harvard architecture with separate program and data buses, enabling single-cycle instruction execution except for branch instructions. The 4MHz oscillator allows a 1 microsecond instruction cycle, providing deterministic real-time control. Brown-out detection is not featured on the LC558, and external reset components may be required for robust power-up behavior in noisy environments. Typical applications include automotive body controllers, appliance control, sensor interface modules, low-cost consumer electronics, and industrial control subsystems. The wide operating voltage (3.0V to 5.5V) and automotive temperature grade make it suitable for 12V battery-powered systems with voltage regulation. When designing with this device, ensure Vdd decoupling with a 0.1uF ceramic capacitor close to the supply pin. Use a 10kohm pull-up on MCLR/Vpp for proper reset, and consider external brown-out protection since the LC558 lacks internal BOR. The OTP memory requires programming via Microchip development tools prior to deployment.

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PIC16LC558-04E/SO - 4MHz 8-Bit OTP MCU 18-SOIC | Microchip
PIC16LC558-04E/SO

PIC16LC558-04E/SO - 4MHz 8-Bit OTP MCU 18-SOIC | Microchip

The Microchip Technology PIC16LC558-04E/SO is an 8-bit RISC microcontroller from the PIC16C family, featuring 3.5KB (2K x 14) of One-Time Programmable (OTP) program memory, 128 bytes of RAM, and a maximum clock speed of 4MHz, housed in an 18-pin SOIC package. Operating from a 2.5V to 5.5V supply, the device integrates a 13-bit instruction set with a 14-bit instruction word, designed for low-power embedded control. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, integrating a CPU core, program memory (ROM/Flash/OTP), data RAM, and peripheral set. Within the semiconductor hierarchy, 8-bit MCUs sit below 32-bit Cortex-M devices and above 4-bit controllers. The PIC16C sub-family specifically uses a RISC (Reduced Instruction Set Computer) Harvard architecture with separated program and data buses, allowing simultaneous instruction fetch and data access for predictable real-time behaviour. Key features of the PIC16LC558 include an integrated watchdog timer, power-on reset, brown-out detect, 13 I/O pins, and two 8-bit timers (Timer0/Timer2) plus one 16-bit Timer1. The OTP program memory is factory-programmable once, making the part suitable for medium-volume production where mask ROM economics are not justified but in-system reprogrammability is not required. The device architecture uses 35 single-word instructions with most executing in a single instruction cycle (4 clock periods), giving an effective throughput of 1 MIPS at 4MHz. Peripherals support interrupt-on-change on PORTB and a 5-channel 8-bit ADC on higher-pin siblings, while the LC558 itself offers digital I/O and timer resources. The LC designation confirms the low-voltage, lower-power CMOS variant of the PIC16C5x/558 line. Typical applications include consumer appliance control, sensor signal conditioning front-ends, LED driving controllers, and low-cost industrial timer/replacement logic. The wide 2.5V-5.5V range also supports battery-powered devices such as remote controls and toys. Designers select the OTP variant when unit cost matters more than field reprogrammability. When designing with this device, ensure the oscillator configuration matches the application: the LC558 supports RC, crystal, and internal oscillator modes selected via configuration bits. The OTP nature means firmware must be verified before programming, and unused I/O pins should be configured as outputs to minimize quiescent current. This page synthesizes distributor pricing, drop-in same-package alternatives, and engineering design notes for the PIC16LC558-04E/SO that the bare manufacturer datasheet does not present in a single place.

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PIC16LC558-04E/SS - 8-bit OTP MCU 4MHz 3.5KB 20-SSOP | Microchip
PIC16LC558-04E/SS

PIC16LC558-04E/SS - 8-bit OTP MCU 4MHz 3.5KB 20-SSOP | Microchip

The Microchip Technology PIC16LC558-04E/SS is an 8-bit RISC microcontroller from the PIC16C family, featuring 3.5KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 13 I/O pins, housed in a 20-pin SSOP package with extended temperature grade. Operating at 4 MHz from a 3.0V to 5.5V supply, this OTP device targets cost-sensitive embedded control applications where code is finalized at production time. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and peripherals on one die. The PIC16C/LC family uses a Harvard RISC architecture with a 14-bit instruction word, which improves code density compared to byte-oriented 8-bit CISC cores. Within the broader taxonomy, the PIC16LC558 sits between PIC12/14 sub-families and higher-end PIC18 devices, and historically competed with 8051-core MCUs and early AVR tiny/Classics. The 'LC' suffix indicates a low-voltage (2.5V-5.5V) variant versus the standard PIC16C range. Key features of the PIC16LC558-04E/SS include a 4 MHz maximum operating frequency, 13 digital I/O pins, an integrated watchdog timer, brown-out reset, power-on reset, and a programmable 8-bit timer/counter. The OTP memory is factory- or field-programmable once and is non-erasable, which lowers per-unit cost for high-volume production but rules out firmware updates. The 'E' suffix denotes an extended industrial temperature grade of -40C to +125C, making this part suitable for harsh-environment applications. Architecturally, the PIC16LC558 employs a two-stage pipeline and 14-bit-wide instruction fetch to execute most instructions in one instruction cycle (4 clock periods). On-chip peripherals include a 5-channel 8-bit ADC, an analog comparator, and a USART/SCI port. The Harvard bus separates program and data fetches, allowing simultaneous access and deterministic interrupt latency. Power management is handled via Sleep mode with wake-on-change, and the brown-out reset thresholds are factory-trimmed. Typical applications for the PIC16LC558-04E/SS include automotive body electronics (window lifters, seat controllers), industrial sensor interfaces, low-end white goods and appliance controllers, battery chargers, LED drivers, and remote-control transmitters. The extended temperature grade and OTP economics are well-matched to high-volume, sealed-unit products where field firmware updates are unnecessary. When designing with this part, note that OTP memory prevents in-system firmware iteration; engineering samples should be evaluated on a windowed (JW) or UV-erasable variant before committing to OTP for production. Programming requires a Microchip ICD or compatible device programmer, and code must fit within 2K x 14 instructions. Plan for worst-case I/O count, as some pins are multiplexed with the reset or oscillator functions. This page synthesizes distributor pricing, drop-in alternative MPNs, and practical design notes not found in the manufacturer datasheet.

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PIC16LC558-04I/P - 4MHz 8-Bit OTP MCU, 3.5KB, 18-PDIP | Microchip
PIC16LC558-04I/P

PIC16LC558-04I/P - 4MHz 8-Bit OTP MCU, 3.5KB, 18-PDIP | Microchip

The Microchip PIC16LC558-04I/P is an 8-bit RISC microcontroller from the PIC® 16C family, featuring a 4 MHz maximum clock speed, 3.5 KB (2K x 14) of One-Time-Programmable (OTP) program memory, and 128 bytes of RAM, housed in an 18-pin PDIP (0.300 inch / 7.62 mm) through-hole package. It operates from a supply voltage range of 3 V to 6.25 V and is qualified for the industrial temperature grade of -40 °C to +85 °C. The device offers 13 digital I/O pins arranged across two ports and integrates a Harvard-architecture CPU core with a 14-bit instruction word. An 8-bit microcontroller is a single-chip computer containing a CPU, program memory, RAM, and peripheral I/O on one die. The PIC16C5X baseline family uses a RISC architecture with a 33-instruction set, two-stack hardware, and OTP ROM for cost-sensitive embedded applications. LC variants denote the low-power CMOS process node, while the 16C5X core is one of the most widely deployed legacy 8-bit architectures in industrial control, white goods, and consumer devices. Key features of the PIC16LC558-04I/P include a maximum instruction cycle of 250 ns at 4 MHz, integrated watchdog timer with on-chip RC oscillator, power-on reset, and up to 13 bidirectional I/O pins with programmable pull-ups. The device supports in-circuit serial programming via the RB6/RB7 pins on compatible parts and includes a hardware timer/counter (TMR0) with an 8-bit prescaler. Sleep mode current drops to a few microamps, enabling battery-friendly standby behavior in always-on systems. The PIC16LC558 uses Microchip's classic baseline architecture, employing a 14-bit instruction word and separate program/data buses (Harvard) so that the fetch and execute phases can be pipelined. The ALU operates on 8-bit data with carry/borrow and bit-manipulation primitives that make single-bit I/O control concise in C or assembly. The LC process reduces dynamic power consumption compared with the original EPROM-based 16C5X parts, making this MCU a popular replacement in industrial installations where newer flash-based PICs are not form-fit compatible. Typical applications include legacy industrial controllers, appliance user-interface boards, motor-driver slave controllers, simple sensor-front-end signal conditioning, and remote-control transmitter/receiver pairings. The 18-pin PDIP footprint also makes the part well suited to through-hole hobby and educational platforms, breadboard prototyping, and equipment retrofits where a surface-mount part cannot be used. When designing with this device, note that OTP memory cannot be re-programmed, so firmware must be fully validated before final programming. Use decoupling capacitors of 0.1 µF close to VDD/VSS, follow the datasheet's oscillator layout guidelines, and respect the maximum I/O sink/source ratings of 25 mA per pin and 100 mA per port. This page synthesizes current distributor pricing, parametric drop-in alternatives, and practical design notes for the PIC16LC558-04I/P that supplement the manufacturer datasheet.

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PIC16LC558-04I/SO - 4MHz 8-bit MCU 3.5KB OTP 18-SOIC | Microchip
PIC16LC558-04I/SO

PIC16LC558-04I/SO - 4MHz 8-bit MCU 3.5KB OTP 18-SOIC | Microchip

The Microchip Technology PIC16LC558-04I/SO is an 8-bit RISC microcontroller from the PIC16C family, operating at up to 4 MHz with 3.5 KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 13 I/O pins, housed in an 18-pin SOIC package. It is part of the PIC16LC5x low-voltage CMOS baseline MCU family designed for 2.5 V to 5.5 V operation in industrial temperature range (-40 °C to +85 °C), with the LC suffix denoting the low-voltage CMOS process and the I suffix denoting the industrial temperature grade. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, program memory, and peripherals. PIC microcontrollers use a modified Harvard RISC architecture with a small instruction set (33 single-word instructions in the PIC16C5x family), enabling predictable timing and efficient code density. PIC16C5x devices sit in the baseline hierarchy: 8-bit MCU -> RISC MCU -> PIC microcontroller -> embedded controller. The 'C' suffix designates the EPROM/OTP program memory variant (vs. 'F' for Flash), and the 'LC' prefix designates the low-voltage (2.5 V to 5.5 V) CMOS process node. Key features include a 4 MHz maximum operating frequency, 2 K x 14 (3.5 KB) of OTP program memory organized as 12-bit-wide instructions, 128 bytes of data RAM, a 13-bit program counter addressing 8 KB of program space, and 13 digital I/O pins arranged across two ports (RA0-RA3, RA4, RB0-RB7). The device supports in-circuit serial programming (ICSP), has a watchdog timer, and operates from a single 2.5 V to 5.5 V supply. Its baseline architecture omits interrupts, simplifying deterministic loop-based firmware patterns. The PIC16LC558 uses a RISC pipelined execution engine with 12-bit instructions and a fixed instruction cycle of 4 oscillator clocks (1 µs per instruction at 4 MHz). The Harvard bus architecture separates program and data memory buses, allowing simultaneous instruction fetch and data access. The OTP memory is windowless and one-time-programmable - once programmed the code is permanent but cannot be erased, making the part well suited to mature production firmware with no field upgrade requirement. Typical applications include appliance control, sensor interfaces, low-end consumer electronics, industrial control logic, automotive body modules (non-safety), LED drivers, and battery-powered devices where 2.5 V operation from a single cell plus a boost converter extends usable runtime. The 13 I/O and small memory suit simple state-machine and fixed-sequence control tasks. When designing with the PIC16LC558-04I/SO, note that it lacks interrupts and on-chip peripherals beyond timers and watchdog, so firmware must use polling. The OTP memory means firmware must be finalized before programming - there is no Flash-style in-field update path. Designers targeting the same pinout with flash memory should evaluate the PIC16F505 / PIC16F506 families in SOIC packages. This page synthesizes distributor pricing, parametric alternatives, and design notes for the PIC16LC558-04I/SO that are not consolidated in the Microchip datasheet alone.

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PIC16LC558-04I/SS - 8-bit MCU, 4MHz, 3.5KB OTP | Microchip
PIC16LC558-04I/SS

PIC16LC558-04I/SS - 8-bit MCU, 4MHz, 3.5KB OTP | Microchip

The Microchip Technology PIC16LC558-04I/SS is an 8-bit RISC-based CMOS microcontroller featuring 3.5KB of one-time-programmable (OTP) program memory, 128 bytes of RAM, and 13 digital I/O pins, housed in a 20-pin SSOP package. It operates from a 3.0V to 5.5V supply at a maximum clock speed of 4 MHz and is qualified to the industrial temperature range of -40C to +85C. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and configurable peripheral I/O onto one die. The PIC16C/L family (to which the PIC16LC558 belongs) sits inside the broader taxonomy: microcontroller -> embedded controller -> integrated circuit -> semiconductor. The "LC" prefix in the part number denotes a low-voltage CMOS variant, optimized for battery-powered and 3.3V systems where the standard PIC16C558 (2.5V-6.0V operation) is unsuitable. Key features of this device include 13 bidirectional I/O pins with individual direction control, a 14-bit instruction set for compact code density, an 8-bit timer/counter with a programmable prescaler, a watchdog timer with its own on-chip RC oscillator for reliable operation, an analog comparator module, and an internal power-on reset (POR) circuit. The OTP program memory allows one-time field programming, making this part economical for low-to-medium volume production runs where mask-ROM programming is not economical. Architecturally, the PIC16LC558-04 uses a Harvard-class core with separate program and data buses, providing deterministic instruction timing. The "-04" speed suffix specifies the 4 MHz maximum oscillator, which corresponds to a 1 microsecond instruction cycle. Internal RC oscillator options (with calibration) reduce external component count for cost-sensitive designs. Typical applications include appliance control, sensor signal conditioning, low-end motor control (small DC fans and solenoids), battery-powered instrumentation, smart-card readers, and simple human-machine interface (HMI) boards where the 13 I/O pins are sufficient. The wide 3.0V-5.5V operating range suits both 3.3V digital logic rails and legacy 5V systems. When designing with this part, note that the OTP memory requires a dedicated programmer (such as MPLAB PM3 or PICkit 3) and the device cannot be re-flashed in-circuit. For new designs where in-circuit reprogrammability is desirable, consider the flash-based PIC16F88 or PIC16F716, which share a compatible peripheral set. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16LC558T-04/SO - 4MHz 8-bit CMOS MCU, 3.5KB OTP, 18-SOIC | Microchip
PIC16LC558T-04/SO

PIC16LC558T-04/SO - 4MHz 8-bit CMOS MCU, 3.5KB OTP, 18-SOIC | Microchip

The Microchip Technology PIC16LC558T-04/SO is an 8-bit RISC CMOS microcontroller from the PIC16C5x family, featuring a 4 MHz maximum clock speed, 3.5 KB (2K x 14) of One-Time Programmable (OTP) program memory, and 128 bytes of RAM, housed in an 18-pin SOIC package. It operates from a supply voltage range of 3.0 V to 6.25 V across commercial temperature grades, with 13 general-purpose digital I/O pins and an integrated 8-bit timer/counter. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data bus, a Harvard or modified-Harvard CPU core, on-chip program memory, working RAM, and peripheral IP such as timers, ADC, and serial interfaces. Microcontrollers sit at the bottom of the embedded-computing hierarchy (MCU -> embedded processor -> SoC) and are used wherever deterministic, low-power, cost-sensitive digital control is required. Key features include the 12-bit instruction word RISC core (33 single-cycle instructions), 2-level hardware stack, watchdog timer with its own on-chip RC oscillator, power-on reset, brown-out reset, and an EPROM/OTP program memory that allows prototyping with windowed CERDIP variants and shipping with low-cost OTP SOIC packages. The 4 MHz oscillator at 4 V is the LP (low-power) operating point used in the LC variant. Typical applications include low-cost consumer appliances, remote controls, sensor signal conditioning front-ends, small automation controllers, and battery-powered instrumentation. The wide 3.0-6.25 V supply range allows direct connection to 4-cell NiMH packs or 5 V regulated rails without additional level shifting. When designing with this part, plan a programming adapter because OTP memory cannot be erased; consider PIC16F or PIC16LF flash variants for development. Place a 0.1 uF decoupling capacitor within 5 mm of VDD and ensure MCLR is pulled high through 10 kohm for normal operation.

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PIC16LC558T-04/SS - 8-bit 4MHz OTP MCU 3.5KB 128B RAM 20-SSOP
PIC16LC558T-04/SS

PIC16LC558T-04/SS - 8-bit 4MHz OTP MCU 3.5KB 128B RAM 20-SSOP

The Microchip Technology PIC16LC558T-04/SS is an 8-bit RISC microcontroller from the PIC® 16C family, integrating 3.5KB (2K x 14) of One-Time Programmable (OTP) program memory, 128 bytes of RAM, and 13 general-purpose I/O pins in a 20-pin SSOP surface-mount package. It operates at up to 4MHz and supports 3.3V or 5V supplies, with the "LC" prefix indicating the low-voltage CMOS process variant optimized for portable and battery-powered designs. The "T" suffix denotes Tape & Reel packaging, and "/SS" denotes the SSOP-20 package code. What is an OTP microcontroller? An OTP (One-Time Programmable) microcontroller is a type of MCU whose program memory can be written exactly once at production time using a device programmer, after which the code is permanent. OTPs are the predecessor to flash-based MCUs and remain popular in cost-sensitive high-volume products where firmware updates are unnecessary. The PIC16LC558 belongs to the broader category of 8-bit microcontrollers, which sits within embedded microcontrollers (a sub-class of microprocessors). The PIC architecture uses a RISC instruction set with only 33 single-word/single-cycle instructions, simplifying firmware development and accelerating execution compared to CISC alternatives. Key features include 4MHz maximum clock speed, 13 digital I/O lines, 128 bytes of general-purpose RAM, on-chip Power-On Reset (POR) and Watchdog Timer (WDT) peripherals, and a wide 2.5V-5.5V operating voltage range. The low-voltage "LC" designation enables direct battery operation (e.g., 3.3V Li-ion) without additional regulation. Compared to flash-based PIC16F5x successors, the OTP PIC16C5x/LC55x family offers lower unit cost at high volumes, making it attractive for cost-driven consumer and industrial appliances. The PIC16LC558T-04/SS uses a Harvard architecture with separate program and data buses, allowing instruction fetch and operand access to occur in the same cycle. Its 14-bit instruction word (2K x 14 = 3.5KB) enables compact opcode encoding with most instructions executing in a single instruction cycle (4 clock periods). This yields effective throughput of approximately 1 MIPS at 4MHz, adequate for simple control loops, sensor interfacing, and user-interface tasks. Typical applications include low-cost consumer appliances (toys, remote controls, small kitchen devices), battery-powered sensors and timers, automotive accessory controllers (non-safety-critical), LED drivers and lighting controllers, and simple industrial control tasks such as relay or solenoid drivers. The 13 I/O pins are sufficient for keypad scanning, 7-segment displays, and basic peripheral interfaces. The 20-pin SSOP package is compact yet hand-solderable for prototypes. When designing with this device, note that OTP memory cannot be reprogrammed in-circuit. Use a flash-based PIC16F5x or PIC16F15x with equivalent pinout for development and prototype phases, then migrate to the PIC16LC558 for production. The Watchdog Timer must be cleared periodically in firmware to prevent unintended resets, and unused I/O pins should be configured as outputs to minimize current draw. This page synthesizes distributor pricing, lifecycle status, drop-in pin-compatible alternatives, and engineering design notes not found in the manufacturer datasheet alone, providing actionable information for both procurement and design engineering teams.

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PIC16LC558T-04E/SO - 4MHz 8-Bit OTP MCU, 18-SOIC | Microchip
PIC16LC558T-04E/SO

PIC16LC558T-04E/SO - 4MHz 8-Bit OTP MCU, 18-SOIC | Microchip

The Microchip Technology PIC16LC558T-04E/SO is an 8-bit RISC microcontroller from the PIC16C family with 4 MHz CPU speed, 3.5 KB (2K x 14) One-Time Programmable (OTP) program memory, and an 18-pin SOIC (SO) wide-body surface-mount package. It belongs to the enhanced (-04E) temperature-grade variant specified for -40C to +125C operation, and operates from 2.5V to 5.5V with an external oscillator. A PIC microcontroller (Programmable Intelligent Computer) is a compact RISC-based microcontroller that integrates CPU core, program memory (ROM/OTP/Flash), RAM, and peripherals (timers, I/O, ADC, interrupts) onto a single CMOS die. PIC MCUs sit in the hierarchy: microcontroller -> embedded processor -> semiconductor device. The PIC16C5x baseline family is the simplest, low-cost 12-bit-instruction PIC core, ideal for simple control tasks. Key features of the PIC16LC558T-04E/SO include 12 I/O pins, a 33-instruction set, 25 mA source/sink per I/O, and an internal watchdog timer. The 'LC' suffix indicates the low-power CMOS process with 2.5V to 5.5V VDD range, supporting battery-friendly designs. The 'T' suffix denotes tape-and-reel packaging, and 'E' marks the enhanced automotive temperature grade (-40C to +125C). Typical applications include industrial automation sensor interfaces, automotive body electronics, low-cost consumer appliances, simple LED drivers, and replacement of discrete logic in compact control boards. The wide VDD range and high ESD robustness suit harsh-environment designs where reliability outweighs raw performance. When designing with this device, plan for the OTP memory constraint - code must be perfect before programming. Add a 0.1 uF ceramic decoupling capacitor close to VDD and follow Microchip's PIC16C5x programming and in-circuit serial programming (ICSP) guidelines. This page combines distributor pricing, drop-in same-package alternatives, and engineering guidance not found in the standalone datasheet.

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PIC16LC558T-04I/SO - 8-bit OTP MCU 4MHz 3.5KB | Microchip
PIC16LC558T-04I/SO

PIC16LC558T-04I/SO - 8-bit OTP MCU 4MHz 3.5KB | Microchip

The Microchip Technology PIC16LC558T-04I/SO is an 8-bit CMOS RISC microcontroller from the PIC16C5x family, featuring 3.5KB (2K x 14) of One-Time Programmable (OTP) program memory, 128 bytes of RAM, and 13 I/O lines, housed in an 18-pin SOIC (SO) package. It operates from a 3V to 6.25V supply at up to 4 MHz instruction rate and is qualified for the industrial -40C to +85C temperature range. The "LC" prefix denotes the low-power CMOS process, the "T" suffix indicates Tape-and-Reel packaging, and the "I" suffix specifies the industrial operating range. An 8-bit MCU is a microcontroller built around an 8-bit data path and Harvard architecture, of which PIC is one of the oldest and most widely deployed families. PIC16C5x devices use a 12-bit instruction word and provide only 35 single-word instructions, making them easy to program in assembly or C. They sit at the bottom of the PIC taxonomy (PIC10/12/16/18/24/dsPIC/PIC32) and target cost-sensitive, low-pin-count embedded control tasks where deterministic timing and tiny footprints matter more than raw compute throughput. Key features include 200 ns instruction cycle time at 4 MHz, a watchdog timer with on-chip RC oscillator, Power-on Reset (POR), and a programmable code-protection bit. The 13 I/O pins support high-current sink/source (25 mA sink, 20 mA source per pin) capable of directly driving LEDs and small relays, eliminating external drivers in many designs. The OTP memory supports one-time field programming, suiting volume production where firmware is finalized. Architecturally, PIC16C5x devices use a fixed 12-bit program counter and 2-level deep hardware stack, executed by a single accumulator (W register) and a small general-purpose register file. This minimalist design avoids multi-cycle register-to-register operations and gives deterministic 4-cycle latency per instruction at 4 MHz (1 microsecond per instruction). The result is highly predictable interrupt response that has made the PIC16C5x a long-running favorite for hard-real-time control loops in appliance, automotive, and industrial timing applications. Typical applications include appliance controllers, automotive body electronics, sensor signal conditioning, timer/replacement applications, and small custom ASIC replacements. The wide supply voltage range allows direct battery-powered operation from 4 x AA cells or a 5V regulated rail. When designing with this device, ensure your programmer supports the OTP variant - PIC16C5x parts are NOT field-erasable; any code change requires a new part. Order evaluation units in windowed CERDIP (PIC16LC558-04/JW) for development, then switch to the SO-18 production package for volume. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that complement the manufacturer datasheet for engineers designing with legacy PIC16C5x silicon.

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