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PIC16LC54AT-04/SO - 4MHz 8-Bit OTP MCU 768B 18-SOIC | Microchip
PIC16LC54AT-04/SO

PIC16LC54AT-04/SO - 4MHz 8-Bit OTP MCU 768B 18-SOIC | Microchip

The Microchip Technology PIC16LC54AT-04/SO is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5x family, delivering 4 MHz CPU performance with 768 bytes (512 x 12) of one-time programmable (OTP) program memory and 25 bytes of data RAM in an 18-pin SOIC package. The device is part of the low-cost, high-performance, fully static PIC16C5x architecture, employing 12-bit wide instructions and an 8-bit data path with seven or eight special function hardware registers. A PIC microcontroller (Peripheral Interface Controller) is a family of Harvard-architecture microcontrollers built around a separate program-memory and data-memory bus. PIC MCUs integrate CPU core, program memory, RAM, and peripherals on a single die, and the PIC16C5x sub-family represents the original baseline 8-bit OTP/EPROM PIC architecture - the ancestor of today's much larger PIC10/12/16/18 families. In the broader taxonomy this device belongs to: microcontroller -> 8-bit MCU -> CMOS MCU -> embedded controller -> semiconductor IC. Key features of the PIC16LC54AT-04/SO include 12 I/O pins, a two-level deep hardware stack, direct/indirect/relative addressing modes for both data and instructions, and an 8-bit real-time clock/counter (TMR0) with an 8-bit programmable prescaler. Operating supply voltage spans 3.0 V to 6.25 V (the "LC" suffix denotes the extended low-voltage CMOS variant versus the standard PIC16C54A). The fully static design allows clock frequencies to be arbitrarily reduced, and the part supports power-saving SLEEP mode with a watchdog timer for reliable recovery. The device is fabricated using CMOS EPROM technology and supports in-system programming via the OTP memory array. Its 12-bit instruction word and orthogonal instruction set deliver code density approximately 2:1 better than competing 8-bit MCUs in the same price category. The wide operating voltage window makes the LC variant suitable for battery-powered and 5 V mixed-signal designs. Typical applications include low-cost consumer appliances, automotive sub-system controllers, intelligent sensors, industrial control logic, IR remote-control transmitters, and small appliance timing/sequencing functions where the OTP memory model and 4 MHz clock are sufficient. The PIC16LC54A-04I/SO is the industrial-temperature-range (-40 C to +85 C) sibling; the PIC16LC54A-04E/SO is the extended-temperature variant. When designing with this part, designers must respect the 4 MHz maximum clock and plan instruction-cycle budgets accordingly (one instruction = 4 clock cycles, so 1 MIPS at 4 MHz). The two-level hardware stack limits call depth to two nested subroutines - all but the most trivial firmware must use iterative coding or status-flag tricks to overcome this constraint. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the standalone manufacturer datasheet.

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PIC16LC54AT-04/SS - 8-Bit 4MHz OTP MCU, 768B | Microchip
PIC16LC54AT-04/SS

PIC16LC54AT-04/SS - 8-Bit 4MHz OTP MCU, 768B | Microchip

The Microchip Technology PIC16LC54AT-04/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, delivering 4 MHz CPU performance with 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory in a 20-pin SSOP package. The "L" prefix denotes the low-power CMOS variant optimized for battery-friendly operation from a 3 V to 6.25 V supply, while the "T" suffix indicates tape-and-reel packaging for high-volume SMT assembly lines. According to the verified Microchip datasheet (DS30189G family reference), this part provides 12 digital I/O lines, 25 bytes of RAM, and a 12-bit instruction word that yields 2:1 code compression versus competing 8-bit MCUs. What is an OTP microcontroller? An OTP (One-Time-Programmable) microcontroller contains program memory that can be written exactly once using a programming voltage, after which the bit pattern is permanent. OTP MCUs sit between fully-mask-ROM parts (cheapest at volume, but require a full mask NRE) and flash-based MCUs (re-programmable in-circuit). For low-to-mid-volume production runs where firmware must be locked at the factory and field updates are not required, OTP offers the lowest unit cost while preserving the flexibility of late-stage firmware changes during development. Key features of the PIC16LC54AT-04/SS include 4 MHz maximum clock, fully static CMOS design allowing clock-stopped operation for ultra-low standby power, a programmable code-protection bit, a watchdog timer with on-chip RC oscillator, and a power-on reset (POR) circuit. The 12-bit wide, highly symmetrical instruction set reduces development time and produces compact code density - a hallmark of the PIC16C5X architecture. The device also offers an internal MCLR reset and four oscillator options selectable at programming time (RC, LP, XT, HS). Architecturally, the PIC16LC54A uses a Harvard-style design with separate program and data buses, a 2-level deep hardware stack, and a single 8-bit ALU. Unlike its modern PIC16F successors, the PIC16LC54A does not support interrupts - the program counter simply loops through software branches. This makes the core deterministic and well-suited to simple state-machine and timing-control applications where interrupt latency would add unnecessary complexity. Typical applications include low-cost consumer appliances, battery-powered sensor transmitters, simple motor and relay controllers, replacement of discrete logic in legacy designs, LED display drivers, and remote-control transmitters. The wide 3.0 V to 6.25 V supply range also suits industrial 5 V systems, while the low-power CMOS core allows long-life operation from 2-3 AA cells. When designing with this part, note that the OTP memory means firmware bugs require a board re-spin - use the PIC16F54 flash equivalent (same pinout) for prototyping and the PIC16LC54AT-04/SS only after firmware is finalized. The 20-SSOP package has a 0.65 mm pitch and requires standard surface-mount reflow. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet, giving you a single-source engineering reference for the PIC16LC54AT-04/SS.

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PIC16LC54AT-04E/SO - 8-bit 4MHz 768B OTP MCU | Microchip
PIC16LC54AT-04E/SO

PIC16LC54AT-04E/SO - 8-bit 4MHz 768B OTP MCU | Microchip

The Microchip Technology PIC16LC54AT-04E/SO is an 8-bit CMOS microcontroller from the PIC16C5X family, featuring a 4 MHz maximum operating frequency, 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, and 25 bytes of RAM, housed in an 18-pin SOIC package (0.295 inch / 7.50 mm width). An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, program memory, and I/O peripherals on one die. The PIC16C5X family is a low-cost, high-performance, fully-static, EPROM/ROM-based CMOS MCU family whose 12-bit-wide instructions and 8-bit data path were tuned for embedded control rather than compute throughput. Within the broader taxonomy, MCUs sit under microcontrollers -> processors -> semiconductors -> integrated circuits. The PIC16LC54A belongs to the low-power 'LC' supply range of the 16C5X family, while the OTP 'T' suffix indicates factory-programmed, one-time-programmable memory. Key features include a 12 I/O port count, an 8-bit real-time clock/counter (TMR0), a two-level hardware stack, direct/indirect/relative addressing modes for data and instructions, and seven or eight special-function hardware registers. The device operates from a 3.0 V to 6.25 V supply voltage range, supports the standard PIC16C5X instruction set, and is offered with the extended '-E' temperature grade. The 'LC' sub-family uses CMOS logic for low power consumption versus the original NMOS PIC16C5X. The architecture uses Harvard-style separate program and data paths with a 12-bit instruction word feeding the EPROM/ROM store and an 8-bit file register path feeding RAM. The two-level hardware stack supports subroutine nesting (call/return) but not deep recursion, which is appropriate for the targeted appliance, toy, and timer-replacement applications. Program memory is OTP (not re-programmable in-circuit), so firmware is committed at device programming and verified at production. Typical applications include low-cost consumer electronics, industrial timers and sequencers, simple motor/relay control, battery-powered devices using the LC supply range, and legacy replacement of bipolar timer circuits where a microcontroller adds configurability without a bill-of-materials penalty. The 18-SOIC footprint also suits hand-soldered prototypes and volume surface-mount assembly alike. When designing with this part, allocate the 25-byte RAM budget carefully because PIC16C5X core registers share the same file-register space and leave only a small working area for user variables. Use the device's two-level stack discipline carefully: nested interrupts deeper than two levels will lose return addresses. The OTP memory means firmware bugs must be screened at production, so order pre-production units for firmware validation before committing the OTP mask. This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design considerations derived from the Microchip PIC16C5X datasheet and reference designs - synthesizing data not collated on a single manufacturer page.

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PIC16LC54AT-04E/SS - 4MHz 768B OTP 8-bit MCU | Microchip
PIC16LC54AT-04E/SS

PIC16LC54AT-04E/SS - 4MHz 768B OTP 8-bit MCU | Microchip

The Microchip Technology PIC16LC54AT-04E/SS is an 8-bit PIC® 16C-family microcontroller integrating 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory and 25 bytes of data RAM, housed in a 20-pin SSOP package and rated for a maximum clock speed of 4 MHz. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and I/O peripherals on one silicon die. PIC® 16C-series MCUs use a Harvard architecture with 12-bit-wide instructions and an 8-bit-wide data path, providing 2:1 code compression versus many competing 8-bit cores in the same class. The 'LC' suffix denotes a low-power CMOS variant, while the 'A' in 16LC54A marks the second-generation silicon revision that simplifies the oscillator block and reduces current draw. This places the part in the broader taxonomy: microcontroller -> embedded processor -> semiconductor IC. Key specifications of the PIC16LC54AT-04E/SS include: 768 bytes OTP (512 x 12) program memory, 25 bytes data RAM, 12 I/O pins, a 2-level hardware stack, Power-On Reset (POR), Watchdog Timer (WDT), and a supply voltage range of 3.0 V to 6.25 V. The 20-SSOP surface-mount package measures approximately 5.30 mm body width and supports tape-and-reel shipping. The '04' speed grade caps the oscillator at 4 MHz, while the 'E' code indicates the extended industrial temperature range. Architecturally, the PIC16C5X core executes one instruction per instruction cycle (four clock periods), achieving 1 MIPS at 4 MHz. Peripherals include an 8-bit Timer0 (TMR0) with an 8-bit prescaler, direct/indirect/relative addressing modes, and seven or eight special-function hardware registers. The PIC16C5X instruction set is symmetric across the 12-bit opcode space, simplifying assembler programming and reducing development time. Typical applications include low-cost embedded control in industrial sensors, appliance controls, automotive body modules (non-safety), consumer remote controls, simple battery-powered devices, and legacy replacement designs that maintain 16C5X code bases. The wide 3.0-6.25 V supply range and 4 MHz operation suit both 5 V regulated rails and unregulated battery chemistries. Design considerations: ensure Vdd decoupling with 100 nF ceramic placed within 5 mm of the supply pin, observe MCLR rise-time requirements for reliable Power-On Reset, and reserve one I/O pin for in-circuit serial programming (ICSP) if firmware updates are anticipated. This page synthesizes distributor pricing, same-family drop-in alternatives, SSOP-20 pin compatibility notes, and practical design guidance not found in the standalone datasheet, helping procurement and embedded engineers quickly evaluate the part.

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PIC16LC54AT-04I/SO - 4MHz 8-Bit OTP MCU, 768B | Microchip
PIC16LC54AT-04I/SO

PIC16LC54AT-04I/SO - 4MHz 8-Bit OTP MCU, 768B | Microchip

The Microchip Technology PIC16LC54AT-04I/SO is an EPROM-based 8-bit CMOS microcontroller from the PIC16C5X family operating at 4 MHz with 768 bytes (512 x 12) of one-time programmable program memory, 25 bytes of RAM, and 12 I/O pins in an 18-pin SOIC package. The "LC" prefix denotes the low-voltage CMOS variant that operates across a 3 V to 6.25 V supply range, while the "04" speed grade indicates a 4 MHz maximum clock frequency. This part ships in tape-and-reel packaging (the trailing "T") and carries the "I" industrial temperature grade of -40C to +85C, making it suitable for ruggedized embedded applications. What is an OTP microcontroller? An OTP (One-Time Programmable) microcontroller is a class of MCU whose program memory is implemented as user-programmable non-volatile memory (EPROM/UV-EPROM based) that can be written only once after manufacture using a device programmer. Once programmed, the code becomes permanent; unlike Flash microcontrollers, the program memory cannot be erased or rewritten in-circuit. OTPs occupy a hypernym hierarchy of: microcontroller -> embedded MCU -> CMOS digital IC. They are widely used in high-volume cost-sensitive products where firmware is final, such as appliance controllers, sensor nodes, and disposable consumer devices. Key features of the PIC16LC54AT-04I/SO include a two-level deep hardware call stack, 12-bit wide instructions with 8-bit data path, direct/indirect/relative addressing modes, a single 8-bit timer/counter (TMR0), and seven special function hardware registers. The PIC16C5X core delivers roughly twice the code density of competing 8-bit MCUs thanks to its highly orthogonal 12-bit instruction set, which reduces overall program memory consumption by approximately 2:1 versus 8-bit instruction-set MCUs of the same era. Architecturally, the PIC16LC54A uses a Harvard architecture with separate program and data buses, fully static CMOS design for low quiescent current, and a watchdog timer option on the wider PIC16C5X family. The "A" suffix denotes the improved silicon revision that fixes early silicon errata of the original PIC16C54 and adds the high-end OTP variants. The 18-SOIC (300-mil) package offers a familiar through-hole-compatible footprint for legacy designs. Typical applications include low-cost consumer appliances, simple LED controllers, remote key fobs, basic sensor signal conditioning, educational development platforms, and industrial timer/counter modules where the OTP memory suffices and Flash is unnecessary. The 3 V to 6.25 V supply range and 4 MHz clock are sufficient for slow control loops and human-interface polling tasks. When designing with this MCU, plan program memory carefully: the 768-byte (512 x 12) OTP must hold your entire firmware. Use MPLAB X IDE with MPASMX assembler or XC8 compiler (legacy support) for code development. For new designs, consider migrating to the Flash-based PIC16F54 drop-in equivalent which retains the same pinout and instruction set while adding in-circuit reprogrammability. This page synthesizes distributor stock, parametric alternatives, and design migration paths not found in the manufacturer datasheet, including Flash drop-in replacements and same-package PIC16C5X family variants.

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PIC16LC54C-04I/P - 8-bit 4MHz 768B OTP MCU | Microchip 18-PDIP
PIC16LC54C-04I/P

PIC16LC54C-04I/P - 8-bit 4MHz 768B OTP MCU | Microchip 18-PDIP

The Microchip Technology PIC16LC54C-04I/P is an 8-bit CMOS RISC microcontroller based on the PIC16C5x family, delivering 4MHz CPU clock performance with 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory and 25 bytes of RAM, housed in an 18-pin Plastic DIP (PDIP) package. It features 12 I/O pins, supports an industrial operating temperature range of -40C to +85C, and operates from a supply voltage of 3V to 5.5V (low-power LC variant). An 8-bit microcontroller (MCU) is a small computer-on-a-chip containing a CPU, program memory, RAM, and peripherals on a single die. PIC microcontrollers are part of the broader category of microcontrollers -> embedded controllers -> integrated circuits -> semiconductors. The PIC16C5x architecture delivers instruction performance roughly an order of magnitude higher than competing 8-bit MCUs in its price class, using 12-bit wide instructions with 2:1 code compression over typical 8-bit architectures. Key features include 4MHz maximum clock, 768 bytes OTP program memory, 25 bytes RAM, 12 I/O ports, and a low-power CMOS process. The /P suffix denotes the through-hole PDIP-18 form factor, while the I in /04I/P indicates the industrial temperature grade (-40C to +85C). The OTP memory is one-time programmable but offers cost-effective prototyping and low-volume production. Technical depth: the PIC16C5x uses a Harvard architecture with separate program and data buses, 33 single-word instructions, and a 12-bit instruction width. Two hardware interrupt sources (external INT and timer overflow) and a watchdog timer are provided. Power consumption is low for the LC variant, making it suitable for battery-powered applications. Typical applications include simple embedded control (appliance controls, toys, lighting), sensor signal conditioning front-ends, low-speed serial interface bridges, and legacy industrial replacement designs. The /P PDIP package also supports easy breadboarding and educational development boards. When designing with this part, observe that OTP memory cannot be re-programmed, so choose the PIC16F54-I/P or PIC16C54C-04/P flash variants for development cycles requiring code iteration. The 12-bit instruction width may require recompilation if migrating to PIC16F1x or PIC18 architectures. This page synthesizes distributor pricing, drop-in alternatives from Microchip's PIC16 family, and practical design notes not aggregated on DigiKey or Mouser product pages.

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PIC16LC54C-04I/SO - 4MHz 8-bit OTP MCU 18-SOIC | Microchip
PIC16LC54C-04I/SO

PIC16LC54C-04I/SO - 4MHz 8-bit OTP MCU 18-SOIC | Microchip

The Microchip Technology PIC16LC54C-04I/SO is a low-voltage CMOS 8-bit microcontroller from the PIC16C5x family, featuring a RISC PIC16 CPU core operating at 4 MHz with 768 bytes (512 x 12) of one-time-programmable (OTP) program memory and 25 bytes of RAM. Housed in an 18-pin SOIC package, this industrial-temperature (-40C to +85C) device delivers 12 I/O pins across its 18-lead footprint. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and programmable I/O peripherals on a single silicon die. The PIC16LC54C belongs to the 8-bit microcontroller tier within the broader embedded controller hierarchy (8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC). Its RISC architecture executes instructions from a fixed 33-instruction set in a single instruction cycle, providing deterministic throughput for real-time control applications. Key features include a 4 MHz maximum clock rate, 25 bytes of general-purpose RAM, 12 bidirectional I/O lines, and an OTP program memory that supports prototyping and low-volume production. The 'LC' suffix indicates a low-voltage CMOS variant optimized for battery-powered operation, while the 'C' revision provides an improved instruction set over earlier 'A' and base versions. The industrial temperature grade and OTP memory suit field-programmed, cost-sensitive embedded applications. Architecturally, the PIC16LC54C uses a Harvard-style memory map separating program ROM (12-bit instruction width) from data RAM (8-bit byte-wide). The 4 MHz oscillator drives a four-phase internal clock that delivers 1 MIPS peak throughput, with instruction cycles as short as 1 us. A watchdog timer and power-on reset enhance field robustness, and the 12 I/O pins can be individually configured with weak pull-ups and direction control. Typical applications include battery-powered sensor nodes, simple appliance controllers, low-cost consumer electronics, automotive interior accessories (non-safety), industrial timer/counter modules, and replacement of discrete logic in legacy designs. The wide operating voltage and low power consumption also support remote-control transmitters and small-form-factor embedded modules. When designing with this device, ensure the OTP programming window fits your production volume and field-update model, since OTP cannot be erased or rewritten after programming. For prototypes, consider a flash-based PIC16F54 equivalent in the same 18-SOIC footprint to allow iterative firmware development before locking the OTP production code. This page synthesizes distributor pricing, pin-compatible PIC16C5x alternatives, and practical design notes not found in the bare manufacturer datasheet, giving procurement and embedded engineers a one-stop reference for evaluating this legacy low-cost 8-bit MCU.

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PIC16LC54C-04I/SS - 8-Bit 4MHz OTP MCU, 12 I/O, SSOP-20 | Microchip
PIC16LC54C-04I/SS

PIC16LC54C-04I/SS - 8-Bit 4MHz OTP MCU, 12 I/O, SSOP-20 | Microchip

The Microchip Technology PIC16LC54C-04I/SS is an 8-bit CMOS microcontroller from the PIC® 16C family featuring a 4 MHz maximum CPU clock, 768 bytes of OTP program memory (512 x 12 words), 25 bytes of data RAM, and 12 general-purpose I/O pins, all housed in a 20-pin SSOP package. An 8-bit microcontroller (MCU) is a single-chip computer that integrates an 8-bit CPU core, program memory, data RAM, and peripheral I/O on one die. Within the broader taxonomy, the PIC16LC54C belongs to the PIC16C5x baseline family, which sits at the lowest tier of Microchip's 8-bit PIC microcontroller hierarchy (baseline -> mid-range -> enhanced mid-range -> PIC18). These devices are typically used as glue logic replacements, simple state machines, and cost-sensitive embedded controllers in appliance, consumer, and industrial sensor interfaces. Key features of the PIC16LC54C-04I/SS include 33 single-word instructions (12-bit opcode width), a 4 MHz oscillator input with a 1 µs instruction cycle, two 8-bit timer/counters (TMR0, TMR1), a watchdog timer with on-chip RC oscillator, and a power-on reset circuit. The 'LC' suffix denotes the low-voltage CMOS variant (2.5 V to 6.25 V VDD range) versus the standard 'C' parts (3.0 V to 6.25 V), making it suitable for battery-operated applications. The 'I' temperature grade supports the industrial -40 °C to +85 °C range. Architecturally, the PIC16LC54C uses a RISC-style Harvard architecture with separate program and data buses, enabling single-cycle instruction fetch plus single-cycle execute (except for program branches, which take two cycles). OTP (one-time programmable) memory is programmed once via ICSP (In-Circuit Serial Programming), making this part economical for low-to-medium production volumes where flash reprogrammability is not required. Typical applications include remote control transmitters, appliance control boards (coffee makers, washing machines), battery chargers, LED drivers, fan controllers, security keypads, and simple sensor interfaces where the PIC16F54 flash variant is overkill. The '04' speed grade (4 MHz) is the slowest of the three grades (04/10/20) and consumes the lowest supply current. When designing with this part, note that OTP memory cannot be erased, so firmware must be fully validated on a flash-equivalent PIC16F54 before committing to the OTP die for production. Reserve ICSP pins (RB6, RB7) for in-system programming access even on the final board layout. This page synthesizes distributor pricing, drop-in alternatives (PIC16C54C, PIC16LC54A), and practical design notes not found in the manufacturer datasheet alone.

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

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

The Microchip Technology PIC16LC54CT-04/SO is an 8-bit PIC microcontroller built on a fully-static CMOS architecture, running at up to 4MHz and housed in an 18-pin SOIC (SO) package. It integrates 768 bytes of OTP (One-Time Programmable) program memory organized as 512 words by 12 bits, 25 bytes of data RAM, and 12 digital I/O pins suitable for simple control tasks. The "LC" prefix denotes a low-voltage CMOS variant of the PIC16C5x family, and the "04" speed suffix specifies the 4MHz maximum oscillator frequency. What is an 8-bit OTP microcontroller? An 8-bit OTP MCU is a small, single-chip computer whose program memory can be written only once after manufacture using a programmer, after which the code is permanent. Within the broader semiconductor taxonomy, it sits below flash-based MCUs and above purely hardwired logic, falling under the embedded microcontrollers > microcontroller IC > integrated circuit hierarchy. The PIC16C5x family from Microchip is a foundational architecture that established the now-ubiquitous RISC instruction set in low-cost 8-bit devices. Key features include a 12-bit wide instruction word for compact code density, a RISC core with 33 single-word instructions, two 8-bit timer/counters, a watchdog timer with its own on-chip RC oscillator, and an internal power-on reset circuit. The device operates from a 2.5V to 6.0V supply, drawing typical quiescent current in the low milliamp range. Sleep mode further reduces power for battery-sensitive applications. Technically, the PIC16LC54C uses a Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and data access. The OTP memory cell is implemented with standard EPROM technology, retaining bits for decades when operated within the datasheet specifications. The 4MHz instruction rate translates to a 1 microsecond instruction cycle because the PIC divides the oscillator by four internally, providing predictable timing for assembly-level bit manipulation. Typical applications include appliance control boards, simple sensor interfaces, LED driver sequencers, low-end remote controls, and replacement of discrete logic in cost-sensitive embedded products. The 18-SOIC package is convenient for hand-soldered prototypes and small-batch production runs where through-hole PDIP variants are too large. When designing with this device, note that OTP cannot be re-programmed; verify your firmware on a windowed (JW) or flash-equivalent PIC16F5x part first. The lack of an analog comparator or ADC on the original PIC16C54 means external conditioning is required for any analog signal acquisition. This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, helping engineers evaluate second-source options and lifecycle risk for legacy designs.

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

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

The Microchip Technology PIC16LC54CT-04/SS is an 8-bit RISC microcontroller from the PIC16C5X baseline family, featuring 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory and 25 bytes of general-purpose RAM. It executes instructions at a 4 MHz clock rate, operates from a 2.5 V to 6.25 V supply (LC low-voltage variant), and is housed in a 20-pin SSOP surface-mount package (5.30 mm body width, 0.65 mm pitch, tape-and-reel packaging). The "LC" prefix designates the low-voltage CMOS process, "T" denotes tape-and-reel, "04" indicates the 4 MHz speed grade, and "/SS" specifies the SSOP package. A baseline PIC microcontroller is an 8-bit RISC MCU from Microchip's PIC16C5X family, the lowest-cost tier of the PIC architecture. PIC microcontrollers are single-chip computers containing a CPU, ROM/EPROM/Flash program memory, RAM, and I/O peripherals in one package. PIC MCUs sit within the broader taxonomy of microcontrollers -> embedded processors -> semiconductor devices. The PIC16C5X baseline family uses 12-bit-wide opcodes that achieve roughly 2:1 code compression over competing 8-bit MCUs, allowing denser functionality in smaller program memory footprints. Key features include 12 bidirectional I/O pins, a Power-On Reset (POR) circuit, an independent Watchdog Timer (WDT) with its own on-chip RC oscillator, and a code-protection bit. The device offers a 33-instruction set with 2:1 code compression and a two-stack-deep subroutine return stack. The WDT improves reliability in unattended or electrically noisy environments, while the POR eliminates external reset circuitry in many designs. The PIC16C5X architecture uses a Harvard-design RISC core with separate program and data buses. The OTP program memory is programmed once with a device programmer and cannot be erased, which suits low-cost, high-volume production. The 12-bit instruction width is unusually wide for an 8-bit MCU and is the reason the 768-byte memory holds 512 instructions. OTP occupies a niche between mask-ROM (cheapest, longest lead time) and Flash (reprogrammable, higher cost). Typical applications include low-cost consumer appliances, battery-powered handheld devices, simple sensor interfaces, automotive body controllers, and industrial timer/replacement-logic modules. The commercial temperature range and 4 MHz clock make it suitable for non-real-time control tasks where deterministic behavior and minimal BOM cost matter more than computational throughput. When designing with this device, note that OTP memory cannot be field-updated. Plan firmware revision control carefully, or consider a Flash-based sibling such as the PIC16F54 for engineering builds. The 20-SSOP package requires standard surface-mount assembly; the WDT should be enabled in any product where firmware lockup would create a safety or operational hazard. This page synthesizes Microchip datasheet specifications, verified distributor pricing, drop-in SSOP-packaged pin-to-pin replacements, and practical design notes for baseline PIC embedded designs not consolidated elsewhere.

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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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