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PIC16LC558T-04I/SS

PIC16LC558T-04I/SS - 4MHz 8-Bit OTP MCU, 20-SSOP | Microchip

The Microchip Technology PIC16LC558T-04I/SS is an 8-bit RISC microcontroller from the PIC16C5x family, featuring 3.5KB (2K x 14) One-Time Programmable (OTP) program memory, 128 bytes of RAM, and a maximum clock speed of 4 MHz, housed in a 20-pin SSOP surface-mount package. It integrates 13 general-purpose I/O pins, a Power-On Reset (POR), and a Watchdog Timer (WDT), making it a self-contained control solution for low-cost embedded designs. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/EPROM/Flash/OTP), data RAM, and peripherals such as timers, I/O ports, and reset circuitry. The PIC16LC558 belongs to the PIC16C5x baseline family, characterized by a 12-bit instruction word, a RISC architecture with only 33 single-cycle instructions, and an OTP program memory optimized for low-to-medium volume production runs where re-programmability is not required. Within the broader taxonomy, this device sits in the hierarchy MCU -> 8-bit microcontroller -> PIC16 baseline -> Microchip PIC16C5x family. Key specifications include 13 I/O pins with individual direction control, an operating voltage range of 2.5 V to 5.5 V (3.3 V / 5 V dual-rail capable), a maximum operating frequency of 4 MHz, and a commercial/industrial temperature range of -40 C to +85 C. The device is offered in 20-SSOP (5.30 mm body width) packaging on tape-and-reel for high-volume assembly. Architecturally, the PIC16LC558 uses a Harvard-style bus with separate program and data paths, an 8-level deep hardware stack, and direct/indirect addressing modes. The OTP memory allows one-time factory or in-circuit programming using Microchip's ICSP protocol via RB6/RB7 pins, while the LC suffix denotes the low-voltage variant optimized for battery and 3.3 V systems. Typical applications include consumer appliances, sensor interface modules, simple motor control, LED drivers, security keypads, and low-cost industrial controllers. The combination of low pin count (20 SSOP), minimal external component count, and proven PIC16C5x instruction set makes it attractive for cost-sensitive legacy designs and industrial replacement cycles. Designers should note that this part is now in Obsolete lifecycle status with limited distributor availability, and any new design should consider the PIC16F1xxx family (Flash-based) for long-term supply security. Verify PCN/EOLN notifications and consider stock reserves for production continuity. This page synthesizes distributor pricing, drop-in alternatives, and lifecycle guidance not found in the manufacturer datasheet alone, helping procurement and engineering teams make informed sourcing decisions for this legacy part.

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PIC16LC55A-04/SS

PIC16LC55A-04/SS - 8-bit OTP MCU, 768B, 20 I/O, SSOP-28 | Microchip

The Microchip Technology PIC16LC55A-04/SS is an 8-bit One-Time-Programmable (OTP) RISC microcontroller rated for 4 MHz operation, packaged in a 28-pin SSOP (Shrink Small Outline Package). It integrates 768 bytes of program memory (512 x 12 words), 32 bytes of data RAM, and 20 digital I/O pins, making it a compact solution for cost-sensitive embedded control. The part is specified for the commercial 0C to +70C temperature range and operates from a 3.0 V to 6.25 V supply. An 8-bit OTP microcontroller is a member of the microcontroller (MCU) family, which itself is a sub-class of microcomputer -> embedded processor -> semiconductor IC. Within the Microchip PIC hierarchy, this part belongs to the PIC16C5X baseline architecture, employing a RISC-style instruction set of 33 single-word/single-cycle instructions. OTP memory is one-time-programmable, in contrast to Flash or UV-EPROM, and is intended for high-volume production where code is finalized and re-programmability is not required. Key differentiating features of the PIC16LC55A-04/SS include its baseline PIC16C5X core (no interrupts, fixed hardware stack), 12-bit instruction word length, internal RC oscillator option, power-on reset, watchdog timer, and a wide 3.0-6.25 V supply window that covers both 3.3 V and 5 V rails. The LC prefix indicates a low-power CMOS variant with reduced quiescent current compared to the standard C-series. The 20 I/O count in a 28-pin SSOP enables interfaces to multiple peripherals while keeping PCB area minimal. Architecturally, the PIC16LC55A-04/SS uses a Harvard-style separate code/data path, executing instructions in a single cycle (except branches). Its 8-level hardware stack is fixed, and its program counter is 9 bits, addressing up to 512 words of OTP. The device offers two 8-bit timer/counters and a watchdog timer driven by an internal dedicated RC oscillator for reliable operation without external components. Typical applications include low-cost consumer appliances, white goods user interfaces, simple sensor signal conditioning, LED lighting controllers, and battery-operated handheld devices. The wide operating voltage and low-power CMOS design make it especially useful in products that must run from 2-3 AA cells or from a 5 V regulated rail. When designing with this part, note that the OTP memory cannot be re-programmed in-circuit, so firmware must be fully validated before production programming. Ensure your programmer supports the 28-SSOP package, and budget a decoupling capacitor of 0.1 uF adjacent to VDD and VSS pins for reliable operation. This page synthesizes distributor stock signals, parametric drop-in alternatives, and practical design guidance that is not consolidated in the manufacturer datasheet alone.

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PIC16LC55A-04I/SO

PIC16LC55A-04I/SO - 8-bit OTP MCU, 4MHz, 768B | Microchip

The Microchip Technology PIC16LC55A-04I/SO is a member of the PIC16C5X family of low-cost, high-performance, 8-bit fully static, EPROM/ROM-based CMOS microcontrollers. It operates at up to 4 MHz clock speed, integrates 768 bytes of OTP program memory (512 x 12), 24 bytes of RAM, and 20 digital I/O pins, and is housed in a 28-pin SOIC (SOIC-28, 0.295 inch / 7.50 mm width) package delivered in tube packaging. It is specified for the industrial operating temperature range. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripherals around a compact instruction set. Within the broader taxonomy, the PIC16LC55A belongs to the 8-bit MCU category, which itself falls under microcontrollers -> integrated circuits -> semiconductors. Its RISC-style 12-bit-wide instruction set delivers 2:1 code compression relative to competing 8-bit architectures in the same price tier, allowing developers to fit typical embedded control firmware in a few hundred bytes of program memory. Key features include a 4 MHz oscillator, 12 I/O ports (with 20 total I/O capability), 768-byte one-time-programmable (OTP) EPROM, and a wide 3.0 V to 6.25 V supply voltage range that supports both 3.3 V and 5 V system rails. The CMOS process yields low current draw suitable for battery-powered or always-on appliances, and the static core design eliminates the minimum clock frequency required by many competing dynamic-logic cores. The architecture combines a 12-bit instruction word with a Harvard bus that separates program and data memory, a 2-level hardware stack, and dedicated timer/counter peripherals. Watchdog timer, power-on reset, and brown-out detection peripherals reduce external component count, and the OTP memory allows last-minute firmware customization during production programming. Typical applications include low-cost consumer appliances, simple industrial controllers, battery-powered sensor nodes, LED lighting controllers, and remote-control transmitter logic. Designers should pay attention to the OTP programming voltage and ensure the chosen programmer (such as Microchip's PM3) supports the PIC16LC55A. Pin-compatible migration to PIC16F5X flash parts is also worth investigating for prototype iteration. This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes beyond what the manufacturer datasheet alone provides.

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PIC16LC55A-04I/SS

PIC16LC55A-04I/SS - 8-bit CMOS MCU, 768B OTP, 4MHz, SSOP-28 | Microchip

The Microchip Technology PIC16LC55A-04I/SS is a low-power 8-bit CMOS microcontroller from the PIC16C5X family, delivering 4 MHz maximum clock speed with 768 bytes of one-time-programmable (OTP) EPROM program memory and 24 bytes of RAM, housed in a 28-pin SSOP package. According to Microchip datasheet DS30430E, this device is engineered for cost-sensitive embedded applications requiring deterministic RISC performance, with 12-bit wide instructions achieving 2:1 code compression over competing 8-bit MCUs in its class. The 'LC' prefix denotes the extended voltage (3.0V to 6.25V) low-power CMOS variant optimized for battery and industrial environments. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, RAM, and peripherals onto one IC. Microcontrollers sit within the embedded systems hierarchy: MCU -> microcontroller -> embedded processor -> semiconductor. The PIC16C5X family from Microchip pioneered the Harvard-architecture RISC approach for 8-bit embedded control, separating program and data buses to enable simultaneous instruction fetch and data access. Key features of the PIC16LC55A-04I/SS include 20 digital I/O pins, two 8-bit timers (Timer0 with programmable prescaler, Timer1 with 16-bit mode), a watchdog timer with on-chip RC oscillator, power-saving SLEEP mode, and a 4 MHz internal/external clock input. The device supports In-Circuit Serial Programming (ICSP) via RB6/RB7 pins, enabling firmware updates after PCB assembly without removing the chip. Its wide 3.0V to 6.25V operating range accommodates both 3.3V and 5V system rails with a single part number. Architecturally, the PIC16LC55A uses a Harvard RISC core with 33 single-cycle instructions, 2-stage pipeline, and direct/indirect addressing modes. The 12-bit instruction word is highly orthogonal, simplifying compiler and assembler code generation. The '04' speed suffix indicates 4 MHz maximum oscillator frequency, and the 'I' suffix indicates the industrial temperature grade (-40C to +85C), while '/SS' specifies the SSOP-28 surface-mount package. Typical applications include appliance control (washing machines, microwave ovens), industrial sensor interfaces, LED display drivers, low-end remote controls, battery-powered instruments, and automotive body electronics subsystems. The 20 I/O count and modest memory make it well-suited for replacing discrete logic in cost-optimized designs. When designing with this MCU, allocate one I/O pin as a system reset if external supervisor ICs are not used, and provide adequate decoupling (100nF + 10uF) near the VDD pin. The internal oscillator calibration is factory-set, but external crystal accuracy may be needed for timing-critical UART or PWM applications. This page synthesizes distributor stock levels, parametric drop-in alternatives from the PIC16C5X family, and practical design notes not found on Microchip's product brief alone, giving engineers and procurement teams a one-stop reference for this legacy OTP microcontroller.

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PIC16LC55AT-04/SO

PIC16LC55AT-04/SO - 8-bit OTP MCU, 4MHz, 28-SOIC | Microchip

The Microchip PIC16LC55AT-04/SO is an 8-bit CMOS microcontroller from the PIC16C5X family, offered as an OTP (One-Time Programmable) device with 768 bytes of program memory (512 x 12 words) and 25 bytes of data RAM. It operates at a 4 MHz clock speed across a supply voltage range of 3.0 V to 6.25 V, in a 28-pin SOIC surface-mount package supplied on tape-and-reel. An OTP microcontroller is a variant of programmable microcontroller in which the on-chip program memory can be written exactly once by the user or by the factory and is thereafter read-only, sitting between mask-ROM (cheapest, factory-programmed) and flash (re-programmable in-circuit) in cost and flexibility. The PIC16C5X family uses a RISC architecture with 12-bit wide instructions that yield 2:1 code compression versus competing 8-bit MCUs of the same era, reducing development time and code footprint for embedded control tasks. Key features of the PIC16LC55AT-04/SO include 20 general-purpose digital I/O pins, a watchdog timer for reliable unattended operation, a power-on reset circuit, and a wide commercial operating temperature range suitable for cost-sensitive consumer and industrial designs. The 'LC' suffix denotes the low-power CMOS process; the 'A' suffix indicates an improved silicon revision; the 'T' suffix denotes tape-and-reel packaging; and '/SO' designates the 28-pin SOIC (0.295-inch body) footprint. The architecture pairs a small instruction set with a predictable two-cycle-per-instruction pipeline, simplifying timing analysis for interrupt-driven firmware. Internal peripherals include a timer/counter, an analog comparator block on selected family members, and direct LED-drive capable I/O, making the part suitable for simple closed-loop control, user-interface scanning, and sensor aggregation. Typical applications include appliance control boards, low-end remote controls, lighting controllers, simple user-interface key-scan and LED-driver logic, fan and pump controllers, and replacement of discrete logic in cost-sensitive embedded products. The 28-SOIC footprint is industry-standard, simplifying PCB layout across revisions and successors. When designing with the PIC16LC55AT-04/SO, plan for OTP programming (one-time window at production) and verify that the chosen package matches the board footprint; the wide 3.0 V to 6.25 V supply tolerates unregulated 5 V rails common in appliance-grade designs. This page synthesizes distributor pricing, drop-in same-package alternatives (both Microchip-only variants and pin-compatible cross-brand equivalents), and practical design notes that extend beyond the manufacturer datasheet, supporting both engineering selection and BOM sourcing decisions.

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PIC16LC55AT-04/SS

PIC16LC55AT-04/SS - 4MHz 768B OTP 8-bit MCU 28-SSOP | Microchip

The Microchip Technology PIC16LC55AT-04/SS is a low-power 8-bit RISC microcontroller from the PIC16C5X family, delivering 4 MHz CPU clock, 768 bytes of One-Time Programmable (OTP) program memory organized as 512 x 12 bits, 12 digital I/O lines, and a 5-channel 8-bit ADC-equivalent peripheral set, all housed in a 28-pin Shrink Small Outline Package (28-SSOP, 0.209 inch / 5.30 mm body width). An 8-bit microcontroller is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral interfaces on one die. It belongs to the broader category of microcontrollers (MCU) -> embedded microcontrollers -> 8-bit MCUs -> CMOS RISC microcontrollers -> semiconductor ICs. The PIC16C5X family specifically uses a Harvard RISC architecture with only 33 single-word single-cycle instructions, making code density high and execution deterministic — a key reason these MCUs dominated low-cost embedded designs from the mid-1990s onward. Key features include 768 bytes of OTP EPROM (12-bit word width), 25 bytes of general-purpose RAM, 12 bidirectional I/O pins, a watchdog timer with on-chip RC oscillator, a power-on reset circuit, and an 8-bit real-time timer/counter (RTCC). The "LC" prefix indicates a low-power CMOS variant with an extended supply voltage range of 3 V to 6.25 V, allowing operation from two AA cells or 5 V rails. The "04" speed suffix specifies 4 MHz maximum oscillator frequency. Architecturally, the device uses a 12-bit instruction word with a 2-stage pipeline, so most instructions execute in a single 250 ns clock cycle at 4 MHz. The OTP memory is programmed via Microchip's ICSP (In-Circuit Serial Programming) protocol, eliminating the need for a separate programmer socket. An 8-bit prescaler extends the RTCC and watchdog timing, and the internal RC oscillator provides a low-cost clock option without external crystals. Typical applications include consumer appliances, low-end toys and educational devices, simple sensor interfaces, battery-powered remote controls, and white-goods controllers. The wide 3 V to 6.25 V supply range also makes the part a fit for 5 V industrial control boards and automotive accessory modules (where the /I industrial or /E extended temperature grade is required instead). A key design consideration is that the OTP memory can be programmed only once; for prototyping or field-updatable firmware, choose the PIC16F55 or PIC16CR55 sibling that uses Flash or ROM instead. Also note that this part is built on a legacy 16C5X core — modern designs should consider PIC16F1xxx or PIC16F1xxxx families for active migration paths. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16LC56A-04/P

PIC16LC56A-04/P - 4MHz 8-Bit CMOS MCU, 1.5KB EPROM | Microchip

The Microchip PIC16LC56A-04/P is a member of the PIC16C5X baseline 8-bit CMOS microcontroller family, built around Microchip's proprietary RISC architecture with 33 single-word instructions. It provides 1.5KB of one-time-programmable/UV-erasable EPROM program memory and 25 bytes of general-purpose RAM, executing instructions at 4 MHz from a 3.0 V to 6.25 V supply. The device is housed in an 18-pin PDIP (Plastic DIP) through-hole package, making it breadboard-friendly for prototyping and legacy design maintenance. The PIC16C5X is a baseline 8-bit microcontroller (MCU) family introduced by Microchip in the early 1990s, sitting at the entry level of the PIC micro controller taxonomy. As a Harvard-architecture device, the program and data buses are separate, allowing simultaneous fetch and access. It belongs to the broader category of microcontrollers -> embedded controllers -> microprocessors -> semiconductors. The 12-bit wide instructions are highly symmetrical, delivering 2:1 code compression over competing 8-bit MCUs in the same price class. Key features of this device include 12 bidirectional I/O pins (port A: 4 lines; port B: 8 lines) capable of directly driving LEDs, an 8-bit real-time clock/counter with 8-bit prescaler, watchdog timer with on-chip RC oscillator for reliable operation, and Power-on Reset (POR) plus Device Reset Timer (DRT) for clean startup. The instruction cycle time of 1 microsecond at 4 MHz provides deterministic interrupt-free execution. Operating temperature range is commercial, 0C to +70C. Architecturally, the PIC16LC56A-04/P is a low-power CMOS variant of the PIC16C56A. The LC suffix designates a wider supply voltage range (3.0 V to 6.25 V) compared with the C-version (4.5 V to 5.5 V). The EPROM-based memory enables repeated erasing via UV exposure through the ceramic windowed package option (CERDIP-18 JW), which is useful for development; the P-suffix plastic package is the production/programmed variant. Typical applications include low-cost consumer appliances, automotive body controllers, industrial timers and counters, HVAC controls, remote transmitters, and security alarm panels. The 12-bit instruction set and 1.5KB program memory are well-matched to logic-replacement, sequencer, and basic sensor-reading tasks where an 8-bit MCU with deterministic timing is preferred over a complex Cortex-M class device. When designing with this device, confirm that the supply rail does not dip below 3.0 V under worst-case load transients, and place a 0.1 uF decoupling capacitor within 5 mm of the VDD pin. For new designs, consider migrating to the flash-based PIC16F series for in-circuit reprogrammability, lower unit cost at moderate volumes, and wider distributor inventory. This page synthesizes distributor pricing, parametric data, and pin-compatible same-family alternatives not found in any single manufacturer datasheet.

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PIC16LC56A-04/SO

PIC16LC56A-04/SO - 1.5KB OTP 8-bit MCU 4MHz SOIC-18 | Microchip

The Microchip Technology PIC16LC56A-04/SO is an 8-bit RISC microcontroller from the PIC16C5X family, featuring 1.5KB (1K x 12) of One-Time Programmable (OTP) program memory, 25 bytes of RAM, and 12 I/O pins, operating at up to 4 MHz from a 3V to 6.25V supply in an 18-pin SOIC package. The part is a low-power CMOS variant of the PIC16C56A, identified by the "LC" prefix denoting the wide-voltage "L" family and OTP "C" memory type, designed for cost-sensitive embedded control applications where deterministic execution and minimal external component count are critical. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data RAM, and peripheral I/O on one die. MCUs sit at the top of the embedded system hierarchy alongside DSPs, FPGAs, and ASICs, and the PIC16C5X family in particular pioneered the Harvard-architecture 8-bit RISC segment, delivering 12-bit-wide instructions with 2:1 code compression versus typical 8-bit CISC competitors, which translates into higher effective code density per kilobyte of program memory. Key features include a 4 MHz maximum clock rate, a 33-instruction RISC core with 12-bit opcode width, two 8-bit I/O ports (Port A and Port B) totaling 12 I/O lines, a programmable watchdog timer, an 8-bit real-time counter/counter (TMR0) with programmable prescaler, and power-saving SLEEP mode. The OTP memory is one-time programmable, making this part well suited to volume production runs that do not require firmware updates in the field. The PIC16LC56A-04/SO uses a Harvard architecture with separate program and data buses, enabling single-cycle instruction fetch except for program branches. The four-megahertz internal oscillator divider and the integrated power-on reset and brown-out detect (not always present on the 16C5X base line, please verify per revision) simplify external circuitry. The "-04" speed suffix designates the 4 MHz maximum clock, distinguishing it from the "-10" and "-20" variants that operate at higher frequencies. Typical applications include low-cost consumer appliances, remote control transmitters, sensor signal conditioning front-ends, battery-powered timer products, automotive body electronics modules, and simple industrial control replacement of discrete logic. The 12 I/O lines comfortably drive LED arrays, keypads, small character LCDs and relay or triac interfaces. The wide 3V to 6.25V supply range is friendly to both 3.3V and 5V rails. When designing with this device, plan the OTP programming step into your production flow because OTP cannot be erased or rewritten. Reserve a 100 nF decoupling capacitor close to VDD and a 10 kohm pull-up on MCLR, and verify timing margins at the worst-case 4 MHz and the minimum VDD of 3.0V, since CMOS RISC cores can slow dramatically near the lower supply bound. This page synthesizes distributor pricing across Mouser, LCSC and Jotrin, parametric alternatives from the PIC16C5X pin-compatible family, and practical design notes that go beyond the bare Microchip datasheet.

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PIC16LC56A-04/SS

PIC16LC56A-04/SS - 1.5KB OTP MCU, 4MHz, 12 I/O SSOP20 | Microchip

The Microchip Technology PIC16LC56A-04/SS is an 8-bit RISC microcontroller in the PIC16C5X family, featuring 1.5 KB of one-time-programmable (OTP) program memory, 25 bytes of RAM, and 12 digital I/O pins. It operates at a maximum clock speed of 4 MHz over a 3.0 V to 6.25 V supply range and is housed in a 20-pin SSOP package, making it a compact drop-in choice for cost-sensitive embedded designs. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals on a single die. The PIC16C5X family uses a RISC architecture with only 33 single-word/12-bit-wide instructions, achieving roughly 2:1 code compression over competing 8-bit MCUs in its class. Compared with broader families, this PIC sits at the entry level of the PIC16 baseline hierarchy (PIC16C5X -> PIC16 baseline -> PICmicro -> 8-bit MCU -> microcontroller -> semiconductor). Key features include a programmable code-protection bit, a Watchdog Timer with its own on-chip RC oscillator for reliable reset, Power-on Reset, and a 4 MHz internal/external clock option with a 1:1, 1:2, 1:4, or 1:8 prescaler. The 8-bit real-time clock/counter architecture, plus 12 CMOS-compatible I/O lines, supports simple digital I/O and timer-based control tasks without external glue logic. The device is fabricated in a low-power CMOS process optimized for the LC (low-voltage) supply range, giving the 04 speed-grade designation its 4 MHz ceiling. The SSOP-20 footprint reduces board area versus the original CERDIP-18 windowed package while preserving pin compatibility at the silicon level for the same PIC16C5X base family. Typical applications include appliance control, sensor signal conditioning, simple motor/relay drivers, automotive body controllers (where PIC16C56A variants are AEC-Q100 supported), and battery-powered remote controls. It also fits hobbyist and educational platforms where a low pin-count baseline PIC is preferred. When designing with this device, note that OTP memory cannot be erased in-circuit - code-protect is one-way. Place a 0.1 uF decoupling capacitor close to VDD and route the reset line away from switching nodes to avoid spurious resets from the Watchdog Timer. This page synthesizes distributor pricing, drop-in SSOP-20 alternatives, and practical design notes not found in the bare manufacturer datasheet, giving procurement and engineering teams a single source of truth for the PIC16LC56A-04/SS.

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PIC16LC56A-04I/P

PIC16LC56A-04I/P - 8-Bit 1.5KB OTP MCU, 4MHz, 18-PDIP | Microchip

The Microchip Technology PIC16LC56A-04I/P is an 8-bit RISC CMOS microcontroller from the PIC16C5X family, offering 1.5KB of one-time-programmable (OTP) EPROM program memory in an 18-pin PDIP through-hole package. It features a 4 MHz maximum operating clock speed, 25 bytes of RAM, 12 digital I/O pins, and a wide 3.0V to 6.25V supply voltage range that supports both 3.3V and 5V system rails. Industrial temperature range (-40C to +85C) makes it suitable for harsh environment deployments. The LC variant uses low-power CMOS technology, making it well-suited for power-constrained embedded control designs. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral I/O onto one silicon die. The PIC16C5X family specifically implements a RISC architecture with 33 single-word, single-cycle instructions, providing 2:1 code compression versus competitors in its class. MCUs form the lowest level of the embedded computing hierarchy: microcontroller -> embedded processor -> SoC -> computer. The 'LC' suffix designates the low-power CMOS process variant; the 'A' suffix denotes an enhanced silicon revision with improved oscillator stability and lower current consumption. Key differentiating features include 12 I/O pins with individually programmable direction, an 8-bit real-time timer/counter (TMR0) with 8-bit programmable prescaler, a watchdog timer for code-lock recovery, and power-saving SLEEP mode. The OTP EPROM allows factory or prototype programming in plastic packages. The 4 MHz clock enables deterministic instruction execution at 1 us per instruction cycle, simplifying real-time control loops. Typical applications include industrial control, embedded automation, motor control (small DC/Stepper drivers), metering (utility, energy, water), low-power IoT end-node sensor reading, and legacy board redesigns. The 18-pin PDIP package remains popular for hobby, education, and through-hole assembly lines. Designers should note that the OTP memory cannot be reprogrammed; for field updates choose the PIC16F56A flash variant. For new designs requiring C compiler support and modern peripherals, the PIC16F1xxx family offers migration paths in the same 18-pin DIP package. This page synthesizes distributor pricing, pin-compatible alternatives, and practical design notes beyond the manufacturer datasheet summary.

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PIC16LC56A-04I/SO

PIC16LC56A-04I/SO - 8-Bit 4MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC16LC56A-04I/SO is an 8-bit EPROM/OTP-based CMOS microcontroller from the PIC16C5X family, delivering 4 MHz maximum clock speed with 1.5 KB (1K x 12) of one-time-programmable program memory and 25 bytes of RAM, housed in an 18-pin SOIC package. It targets cost-sensitive embedded control applications where deterministic RISC execution, low power consumption, and industrial temperature range are required. What is a PIC16C5X microcontroller? The PIC16C5X family is a family of low-cost, high-performance, 8-bit fully static, EPROM/ROM-based CMOS microcontrollers from Microchip Technology. PIC microcontrollers belong to the broader category of microcontroller units (MCUs) -> microcontrollers -> embedded processors -> semiconductor ICs. The PIC16C5X architecture uses 12-bit wide instructions with 2:1 code compression over competing 8-bit MCUs, and the symmetric RISC instruction set reduces development time. The 'LC' suffix denotes an extended low-voltage variant; '04' denotes the 4 MHz speed grade; 'I' denotes industrial temperature range (-40C to +85C); '/SO' denotes the 18-pin SOIC package. Key features of the PIC16LC56A-04I/SO include 12 I/O pins supporting bidirectional digital I/O, a 3.0 V to 6.25 V supply voltage range suitable for 5 V and 3.3 V rails, an 8-bit timer/counter, watchdog timer with on-chip RC oscillator, power-on reset, and code protection. The 12-bit instruction word and two-stage pipeline enable most instructions to execute in a single 250 ns instruction cycle at 4 MHz, simplifying deterministic real-time control loop design. The device is fully static, allowing the clock to be stopped without losing register contents. The PIC16LC56A-04I/SO uses Microchip's baseline PIC16C5X core architecture with 33 single-word instructions. Its 2-stage pipeline overlaps fetch and execute operations. On-chip peripherals include an 8-bit real-time clock/counter (RTCC), watchdog timer (WDT) with its own RC oscillator, and a 4 MHz internal/external oscillator option. The Harvard architecture separates program (EPROM) and data (RAM) memory for simultaneous access. The OTP EPROM allows one-time field programming, ideal for production runs where code stability is established and in-system reprogrammability is not required. Typical applications for the PIC16LC56A-04I/SO include appliance control (washing machines, microwave ovens, coffee makers), automotive body electronics, HVAC thermostats, security systems, remote controls, smart sensors, and battery-powered instrumentation. The combination of low cost, small SOIC-18 footprint, and deterministic execution makes it well-suited for high-volume consumer and industrial products that need reliable embedded control without the overhead of more complex MCUs. When designing with this device, ensure your code budget fits within 1K x 12 (1024 instructions). OTP programming requires high-voltage (13V) Vpp, so plan for in-circuit programming or pre-programmed parts. Use decoupling capacitors (0.1 uF) close to VDD and VSS, and verify the MCLR reset circuit timing for reliable startup in noisy environments. This page synthesizes distributor pricing, drop-in PIC16C5X-family alternatives, and practical design notes not found in the standalone manufacturer datasheet. All values cross-checked against Microchip PIC16C5X datasheet (DS30034D-family) and DigiKey/Mouser inventory as of 2026-09-22.

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PIC16LC56A-04I/SS

PIC16LC56A-04I/SS - 4MHz 8-bit OTP MCU, 1.5KB | Microchip

The Microchip Technology PIC16LC56A-04I/SS is an 8-bit CMOS EPROM/ROM-based microcontroller in the PIC16C5X family, delivering 4 MHz CPU performance with 1.5 KB (1K x 12) of One-Time-Programmable (OTP) program memory and 25 bytes of RAM, housed in a 20-pin SSOP package. It supports 12 I/O lines and operates from a 3.0 V to 6.25 V supply, providing a compact and cost-effective solution for simple embedded control tasks. What is an 8-bit OTP microcontroller? An 8-bit MCU is a microcontroller whose central processing unit operates on 8-bit data words and is purpose-built for low-cost, deterministic control applications. OTP memory allows the user to program the device once after manufacture, which lowers unit cost relative to UV-erasable EPROM and eliminates the quartz window required for erasure. Within the broader hierarchy, an 8-bit MCU sits below 32-bit microcontrollers but offers the lowest BOM cost and smallest die area for applications that do not require DSP, graphics, or connectivity stacks. Key features of the PIC16LC56A-04I/SS include a fully static CMOS design with 33 single-word instructions, a 12-bit instruction word for 2:1 code compression versus other 8-bit MCUs in its class, an 8-bit real-time clock/counter, a watchdog timer for unattended operation, and a power-on reset circuit. The 20-pin SSOP package supports surface-mount assembly while providing 12 GPIO pins for digital interfacing. Architecturally, the device uses a RISC-style Harvard bus with separate program and data paths, a 2-level hardware stack, and direct/indirect addressing modes. The CMOS process delivers low quiescent current suitable for battery-powered products, and the 4 MHz maximum oscillator frequency keeps dynamic power consumption low. Typical applications include appliance controls, HVAC fan controllers, simple sensor interfaces, automotive body electronics (non-safety), low-end consumer products, and battery chargers. The wide 3.0 V to 6.25 V supply range allows direct connection to 4-cell battery stacks or regulated 5 V rails. When designing with this part, note that OTP memory cannot be re-programmed in-circuit. Engineers should plan for development on a windowed CERDIP variant (PIC16LC56A-04I/JW) and finalize firmware before committing to OTP. A 100 nF decoupling capacitor close to VDD and proper oscillator layout are recommended for EMI robustness. This page synthesizes distributor pricing, drop-in alternatives, and practical design considerations for the PIC16LC56A-04I/SS that are not collected in any single manufacturer datasheet, giving procurement and engineering teams a single reference for sourcing and second-sourcing decisions.

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PIC16LC56AT-04/SO

PIC16LC56AT-04/SO - 8-Bit 4MHz OTP MCU, 1.5KB | Microchip

The Microchip Technology PIC16LC56AT-04/SO is an 8-bit RISC microcontroller from the PIC16C5X family, featuring 1.5KB (1K x 12) of One-Time Programmable (OTP) program memory, 25 x 8 bytes of RAM, and 12 I/O pins, housed in an 18-pin SOIC (SOP) surface-mount package. It executes instructions at a 4 MHz clock rate and uses a 12-bit wide instruction word with 33 single-word/single-cycle instructions for a 2:1 code compression ratio over competing 8-bit MCUs. An 8-bit microcontroller (MCU) is a single-chip computer with an 8-bit data bus, ALU, program counter, on-chip memory, and I/O peripherals. The PIC16C5X family belongs to the microcontrollers -> embedded processors -> integrated circuits hierarchy, sitting alongside 8051, AVR, and other legacy 8-bit families. Fully static CMOS design means the clock can be stopped without losing register state, and the LC suffix indicates a low-power CMOS variant aimed at battery-friendly designs versus the standard PIC16C5X EPROM parts. Key features of this device include 1.5KB OTP program memory, 25 bytes of general-purpose RAM, 12 bidirectional I/O pins organized in two ports (RA, RB), a watchdog timer with its own on-chip RC oscillator, power-on reset, and a 4 MHz maximum operating frequency. The 12-bit instruction word and 33-instruction RISC set allow most operations to complete in a single instruction cycle, giving the part an effective throughput of 4 MIPS at the 4 MHz clock rate. The architecture is Harvard-style, separating program and data memory buses. The PIC16LC56A uses a fully static CMOS process with an on-chip oscillator and supports external oscillator modes. It includes a programmable code-protection bit, an 8-bit real-time clock/counter (RTCC) with programmable prescaler, and a 5-deep hardware stack. Because the 'T' suffix denotes tape-and-reel packaging and the '04' speed grade limits operation to 4 MHz, designers should confirm that timing requirements for serial bit-banging or timer-driven loops stay within the 4 MHz instruction budget. Typical applications include low-cost consumer appliances, simple remote-control transmitters, basic sensor signal conditioning, LED lighting controllers, battery chargers, and replacement of discrete logic in glue-logic designs. The 12 I/O pins and small 18-pin SOIC footprint make it well-suited to compact, hand-held, or cost-sensitive products where processing needs are modest but predictable timing and low current draw matter. When designing with this device, note that OTP memory can be programmed only once, so it is best suited to production-volume products or prototyping where code will be finalized before mask ROM is impractical. Provide a clean 5V (or 2.5V-6.25V per LC range) supply with a 0.1 uF decoupling capacitor close to VDD, and keep the MCLR pin either tied high through a 10 kohm resistor or driven by the reset source to prevent unintended resets. This page synthesizes distributor pricing snapshots, same-package drop-in alternatives from the PIC16LC5X family, and practical design considerations beyond the manufacturer datasheet, giving engineers a single reference for sourcing and substitution decisions.

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PIC16LC56AT-04I/SO

PIC16LC56AT-04I/SO - 4MHz 8-bit OTP MCU, 1.5KB, 18-SOIC | Microchip

The Microchip Technology PIC16LC56AT-04I/SO is a member of the PIC16C5X family of low-cost, high-performance, 8-bit fully-static, EPROM/ROM-based CMOS microcontrollers. It operates at a 4 MHz instruction rate from a 2.5 V to 5.5 V supply, integrates 1.5 KB (1K x 12) of One-Time Programmable (OTP) program memory and 25 bytes of general-purpose RAM, and provides 12 general-purpose I/O pins in a compact 18-pin SOIC (SO) package. A microcontroller (MCU) is a single-chip computer containing a CPU core, non-volatile program memory, working RAM, and peripheral I/O. The PIC16C5X architecture pioneered Harvard memory organization with separate program and data buses, 12-bit-wide instructions, and a two-stage pipeline that executes most instructions in one cycle. The 'LC' prefix indicates the low-voltage CMOS variant, allowing operation down to 2.5 V for battery-powered designs, while the 'A' suffix denotes an enhanced baseline device with a 4 MHz oscillator and improved interrupt structure versus the original PIC16C56. The OTP variant is programmed once at production, making it suited to fixed-function appliances and cost-sensitive embedded controllers. Key features include 12 CMOS bidirectional I/O ports capable of directly driving LEDs, an 8-bit timer/counter (TMR0) with a programmable prescaler, a watchdog timer for reliable unattended operation, power-on reset, brown-out detection, and a 4 MHz internal/external oscillator option. The device draws microamp-level sleep current, supports in-circuit serial programming, and operates over the industrial -40 °C to +85 °C temperature range. Typical applications include low-cost consumer appliances, remote-control transmitters, LED lighting controllers, battery chargers, smart sensors, and simple IoT edge nodes. Its wide voltage tolerance also makes it useful in 3 V coin-cell systems as well as legacy 5 V industrial logic. Compared with PIC16F parts, the OTP-based PIC16LC56AT provides the lowest unit cost for high-volume production where code does not need to be updated.

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PIC16LC56AT-04I/SS

PIC16LC56AT-04I/SS - 8-bit 4MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC16LC56AT-04I/SS is an 8-bit CMOS microcontroller from the PIC16C5X family, featuring 1.5KB (1K x 12) of One-Time Programmable (OTP) program memory, 25 bytes of RAM, and a 4MHz maximum operating frequency in a 20-pin SSOP (5.30mm body width) surface-mount package. It belongs to the LC (low-power CMOS) subfamily of the original PIC16C5X baseline architecture, delivering fully static operation with 12 general-purpose I/O pins, an integrated Power-On Reset (POR), and a Watchdog Timer (WDT) for reliable embedded control. What is a PIC microcontroller? A Microcontroller Unit (MCU) is a single-chip computer containing a CPU core, program memory (ROM/Flash/OTP), data RAM, and integrated peripherals such as timers, communication interfaces, and I/O ports. The PIC16C5X baseline family, introduced by Microchip in the late 1980s, uses a 12-bit-wide instruction word and a Harvard architecture with separate program and data buses. The LC variants (PIC16LC5X) operate from 2.5V to 6.0V with CMOS low-power consumption, sitting hierarchically under the broader PIC microcontroller family and the wider 8-bit MCU class of discrete-semiconductor-adjacent integrated circuits. Baseline PICs remain popular for cost-sensitive, deterministic, low-power embedded designs. Key differentiating features of the PIC16LC56AT-04I/SS include its 4MHz instruction execution rate, 1.5KB OTP for fixed-code production, low-voltage LC operation, and the 20-SSOP footprint that enables compact PCB placement. The 04 speed grade designates a 4MHz oscillator input, and the /SS package suffix indicates the plastic shrink-small-outline 20-pin form factor with 0.65mm pitch. The T suffix in the part number denotes tape-and-reel packaging as supplied to OEMs. Technically, the device implements a RISC-like instruction set with only 33 single-word/cycle instructions at 4:1 code compression versus competing 8-bit MCUs of its era. It supports external oscillator clocking and provides configurable I/O with weak pull-up options, an 8-bit real-time timer/counter (TMR0), and a power-saving SLEEP mode. The OTP memory is one-time programmable, suitable for low-to-medium volume production where firmware stability is finalized. Typical applications include appliance control, sensor signal conditioning front-ends, LED driver controllers, low-cost remote controls, security keypads, and industrial timer/sequencer modules. Its 4MHz throughput and 12 I/O pins suit designs where deterministic interrupt response and minimal BOM cost are higher priorities than computational horsepower. When designing with this device, note that OTP memory cannot be reprogrammed, so the engineering samples should use the windowed JW variant for prototype firmware iteration. Decoupling requires a 0.1 microfarad ceramic capacitor placed within 5mm of VDD, and unused I/O should be configured as outputs low to minimize current draw in SLEEP mode. This page synthesizes current distributor pricing, verified drop-in alternatives from the PIC16C5X family, and practical design notes not consolidated in the original Microchip datasheet.

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PIC16LC57C-04/P

PIC16LC57C-04/P - 4MHz 8-bit CMOS MCU, 3KB EPROM, 20 I/O | Microchip

The Microchip PIC16LC57C-04/P is a low-cost, high-performance 8-bit fully-static EPROM-based CMOS microcontroller running at 4 MHz, housed in a 28-pin windowed CERDIP (P) package. It integrates 3KB (2K x 12) of one-time-programmable program memory and 72 bytes of RAM, with 20 digital I/O lines organized across multiple ports for flexible peripheral interfacing. The 'LC' suffix denotes the low-power CMOS process variant, with an operating voltage range of approximately 3V to 6.25V optimized for battery-sensitive designs. A microcontroller (MCU) is a single-chip computer that contains a CPU core, program memory, working RAM, and I/O peripherals. The PIC16C5X family that PIC16LC57C belongs to uses a RISC architecture with only 33 single-word/single-cycle instructions, achieving 2:1 code compression over comparable 8-bit CISC microcontrollers. This part sits in the hierarchy: microcontroller -> 8-bit MCU -> PIC16 family -> baseline-class PIC16C5X, representing the entry tier of the PIC microcontroller ecosystem before the enhanced PIC16F and PIC18 generations. Key features include 4 MHz maximum clock frequency, 12-bit-wide instruction word, 8-level hardware stack, 8-bit timer/counter with 8-bit prescaler, power-on reset, watchdog timer with dedicated on-chip RC oscillator, and programmable code protection. The windowed CERDIP package enables UV erasure for engineering development and prototype iteration. Power-saving SLEEP mode reduces quiescent current to microampere levels, ideal for battery-powered and energy-harvesting applications. The device uses a Harvard architecture with separate program and data buses, two 8-bit bidirectional I/O ports (RA/RB), and additional I/O pins. Its RISC design means most instructions execute in a single instruction cycle (4 clock periods), yielding sustained throughput of approximately 1 MIPS at 4 MHz. The on-chip watchdog timer with its own RC oscillator prevents code lockup in unattended or remote installations. Typical applications include appliance controls, security and access systems, automotive body electronics (non-safety), industrial process controllers, smart sensor nodes, and battery-powered instrument controllers. The 20 I/O pins comfortably drive keypads, LED displays, and low-speed serial communication links. When designing with this part, account for the windowed CERDIP footprint - it is intended for prototype use; production designs should migrate to the OTP or code-protected variants in plastic packages. Always place a 0.1uF decoupling capacitor adjacent to VDD with a short ground return. This page synthesizes distributor pricing, drop-in PIC16 family alternatives, and practical design considerations not consolidated on any single manufacturer datasheet or distributor listing.

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PIC16LC57C-04/SO

PIC16LC57C-04/SO - 8-Bit 4MHz OTP MCU 3KB | 28-SOIC

The Microchip Technology PIC16LC57C-04/SO is an 8-bit RISC microcontroller (MCU) from the PIC16C5X family, operating at up to 4 MHz with 3KB (2K x 12) of One-Time Programmable (OTP) program memory, packaged in a 28-pin SOIC (SO) form factor. It integrates 72 bytes of RAM and 20 digital I/O pins, and is specified for operation across a 2.5V to 6.0V supply range (with the LC low-voltage variant supporting battery-powered designs). A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and peripheral I/O on one die, enabling compact embedded designs. The PIC16C5X family is part of the broader 8-bit microcontroller taxonomy: microcontroller -> embedded controller -> CMOS microcomputer -> semiconductor IC. Within Microchip's portfolio it sits at the entry-level / cost-optimized branch beneath the PIC16F and PIC18 families, favored for high-volume cost-sensitive applications. Key features of the PIC16LC57C-04/SO include a 12-bit instruction word with 33 single-cycle instructions, an 8-bit data path, a hardware watchdog timer, a power-on reset (POR) circuit, and an internal RC oscillator option that lets the device operate without an external crystal. The OTP program memory allows one-time programming in production, lowering unit cost compared to flash parts for mature, fixed-code designs. The wide 2.5V-6.0V VDD range suits both 3.3V and 5V systems. Architecturally, the PIC16LC57C uses a Harvard-style RISC core with separate program and data buses, two 8-bit I/O ports (RA, RB) and two additional I/O lines on PORTC, plus a 5-channel 8-bit ADC on selected siblings. The "C" suffix denotes the CMOS-process revision that delivers low quiescent current versus the older NMOS "B" die, and the "LC" prefix indicates the low-voltage (2.5V min) variant suitable for battery operation. The "-04" speed grade indicates a 4 MHz maximum oscillator frequency. Typical applications include appliance controls, remote keyless entry, smart sensors, low-end user-interface boards, battery-powered instruments, and simple motor-control front ends. Industrial designers often select this part for its wide supply range, robust I/O count (20 pins), and low unit cost. When designing with the PIC16LC57C-04/SO, ensure that your code fits within the 2K x 12 program memory and that the 20 I/O pins cover your signal requirements; the OTP memory means firmware changes require device replacement, so design final-code images only. This page synthesizes distributor pricing from DigiKey, LCSC, and Heisener, pin-compatible drop-in alternatives, and engineering design notes not found on any single distributor listing.

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PIC16LC57C-04/SP

PIC16LC57C-04/SP - 8-Bit 4MHz OTP MCU, 3KB | Microchip

The Microchip Technology PIC16LC57C-04/SP is an 8-bit CMOS OTP-based PIC microcontroller running at 4 MHz, packaged in a 28-pin SPDIP (0.300 inch wide, through-hole) with 3 KB (2K x 12) of program memory, 72 bytes of RAM, and 20 digital I/O lines. It belongs to the PIC16C5X family, features a RISC architecture with 33 single-word instructions, a two-level hardware stack, and an 8-bit real-time clock/counter (TMR0). According to the Microchip PIC16C5X family datasheet, the PIC16LC57C-04/SP is the low-voltage (LC) variant optimized for 3.0V to 6.25V operation. What is an 8-bit OTP microcontroller? An 8-bit OTP (One-Time Programmable) microcontroller is a single-chip computer built around an 8-bit data path with non-volatile program memory that can be written exactly once after manufacture. OTPs sit in the broader taxonomy: microcontroller -> embedded controller -> semiconductor -> integrated circuit. They are widely used in cost-sensitive, high-volume applications where the firmware is finalized before production and field reprogramming is not required. The PIC16LC57C-04/SP specifically belongs to the PIC16C5X baseline family, which uses 12-bit-wide instructions and is the entry tier in Microchip's PIC portfolio. Key features include a 100 ns instruction cycle at 4 MHz oscillator input, direct/indirect/relative addressing for data and instructions, seven or eight special function hardware registers, and a watchdog timer. The low-voltage LC designation distinguishes it from the standard PIC16C57C (4.0V to 6.0V) by extending operation down to 3.0V, enabling battery-powered designs. The part supports 12-bit wide instruction words, providing 2:1 code compression versus competing 8-bit architectures in the same class. The PIC16LC57C-04/SP uses a Harvard bus architecture with separate program and data memories, which allows instruction fetch and operand access to occur in the same cycle. This contributes to its deterministic 4 MHz / 100 ns per-instruction performance and predictable interrupt-free timing. The two-level hardware stack limits nested subroutines but simplifies the core, reducing silicon cost. Typical applications include consumer appliances (remote controls, toys, small kitchen appliances), low-end industrial control (sensor interfaces, simple motor drivers), automotive body electronics (interior lighting, seat controllers), and battery-powered instruments. The wide 3.0V-6.25V operating range makes it suitable for both 3.3V and 5V rails, while the 20 I/O pins provide ample connectivity for typical peripheral sets. When designing with the PIC16LC57C-04/SP, remember that OTP memory is one-time programmable - any firmware bug requires physical replacement of the chip. Engineers should fully validate firmware on a windowed CERDIP prototype (PIC16C57C-04/JW) before committing to OTP production units. The two-level hardware stack also requires careful assembly programming to avoid deep call nesting. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet alone, giving procurement and engineering teams a single reference for sourcing and substituting this mature PIC16C5X baseline MCU.

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PIC16LC57C-04/SS

PIC16LC57C-04/SS - 8-Bit MCU 3KB OTP 4MHz 28-SSOP | Microchip

The Microchip Technology PIC16LC57C-04/SS is an 8-bit RISC CMOS microcontroller from the PIC16C5X family, integrating 3 KB of one-time-programmable (OTP) program memory, 72 bytes of RAM, and 20 general-purpose I/O pins in a 28-pin SSOP package (0.209" / 5.30 mm width, commercial 0C to +70C temperature grade). It executes instructions at a 4 MHz clock rate, providing 4 MHz instruction cycle performance for cost-sensitive embedded applications. An 8-bit microcontroller is a single-chip computer that combines a CPU, memory, and peripherals on a single die. The PIC architecture uses a 12-bit wide instruction word and a Harvard memory layout, which provides 2:1 code compression relative to other 8-bit MCUs in its class. The PIC16LC57C sits within the broader taxonomy of microcontrollers -> 8-bit microcontrollers -> CMOS RISC microcontrollers -> embedded controllers -> semiconductors, and represents one of the lowest-cost entry points in Microchip's mid-range PIC portfolio. Key features include 33 instructions, a 12-bit instruction word, 8-bit data path, 8-level hardware stack, 2 K x 12 OTP program memory, 72 x 8 RAM, four I/O ports (RA, RB, RC, RD), and 8-bit timer with watchdog. The 'C' suffix indicates the CMOS process technology with low power consumption, and the '04' speed designation specifies the 4 MHz oscillator/clock rate. The 'LC' prefix identifies the low-voltage core (2.5V-5.5V) for battery-friendly operation. Typical applications include low-cost consumer electronics, remote controls, small appliances, LED controllers, simple sensor interfaces, and battery-powered devices. The wide 2.5V-5.5V operating range supports both 3.3V and 5V system rails, while the OTP memory is well-suited for production volumes where firmware is finalized and field reprogramming is not required. When designing with this MCU, consider that OTP memory cannot be reprogrammed in-circuit - prototypes should use the windowed JW or UV-erasable variant for development. Power-on reset and watchdog timer improve field reliability, but external decoupling (0.1 uF ceramic near VDD) is mandatory for stable oscillator operation. This page synthesizes distributor pricing, drop-in alternatives within the same 28-SSOP footprint, and practical design notes not found in the manufacturer datasheet alone, helping engineers evaluate sourcing options and pin-compatible replacements.

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PIC16LC57C-04I/P

PIC16LC57C-04I/P - 8-Bit 4MHz OTP MCU 3KB | Microchip | DIP-28

The Microchip PIC16LC57C-04I/P is an 8-bit RISC microcontroller from the PIC16C5X family, featuring 3KB (2K x 12) of One-Time-Programmable (OTP) program memory, 72 bytes of RAM, and 20 digital I/O pins in a 28-pin PDIP through-hole package. Operating at a maximum clock speed of 4 MHz, the device belongs to the "LC" low-voltage sub-family and supports both 3.3V and 5V operation, making it suitable for battery-powered and low-power embedded designs. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripherals on one silicon die. The PIC16C5X family specifically uses a RISC architecture with only 33 single-word/single-cycle instructions, simplifying code development and reducing execution overhead. The OTP memory variant allows one-time field programming - cheaper than flash but intended for volume production where code is fixed. Positioned within the broader product hierarchy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC, the PIC16LC57C bridges classic PIC legacy designs and modern low-power applications. Key features include 4 MHz maximum operating frequency, 2K x 12-bit program word width, 72 bytes of general-purpose RAM, 20 bidirectional I/O pins, an 8-bit timer/counter, and a watchdog timer for reliable operation. The device operates across an industrial temperature range of -40C to +85C, satisfying the "I" (Industrial) suffix designation. Its wide voltage range (typically 2.5V to 6.0V for LC variants) supports both 3.3V and 5V rails commonly found in consumer, industrial, and battery-powered systems. The PIC16LC57C employs Microchip's classic Harvard RISC architecture with a separate program and data bus, enabling single-cycle instruction execution except for program branches. With its OTP-based program memory and CMOS implementation, the device balances cost efficiency with deterministic real-time performance, ideal for high-volume embedded control where flash reprogrammability is not required. Typical applications include appliance control, sensor interfaces, LED driving, low-cost consumer electronics, industrial automation peripherals, and battery-operated devices requiring low quiescent power. Its through-hole PDIP-28 package also makes it convenient for prototyping, hobbyist projects, and educational use where hand-soldering or socketed replacement is desirable. When designing with this part, note that OTP memory cannot be erased or rewritten - firmware must be fully validated before programming. For modern designs requiring in-field updates, consider the PIC16F5X flash-based successor family instead. Engineers should also note that the LC variant's lower voltage limit may require level shifting when interfacing with 5V-only peripherals. This page synthesizes distributor pricing, drop-in alternatives from the same PIC16C5X family, and practical design considerations not found in the standalone Microchip datasheet.

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PIC16LC57C-04I/SO

PIC16LC57C-04I/SO - 8-Bit 4MHz OTP MCU 28-SOIC | Microchip

The Microchip Technology PIC16LC57C-04I/SO is an 8-bit CMOS RISC microcontroller from the PIC16C5X family, featuring a 4 MHz maximum clock speed, 3 KB (2K x 12) of OTP program memory, and 72 bytes of RAM, housed in a 28-pin SOIC wide-body package. The "LC" prefix denotes the low-voltage CMOS variant supporting 2.5 V to 5.5 V operation, while the "-04" suffix indicates the 4 MHz speed grade and the "I" suffix marks the industrial temperature range of -40 °C to +85 °C. An OTP-based PIC microcontroller is a Harvard-architecture device that uses one-time-programmable non-volatile memory for program storage. It belongs to the broader hierarchy: microcontroller -> embedded MCU -> 8-bit MCU -> PIC16 family -> RISC MCU -> semiconductor IC. The PIC16C5X family uses a 12-bit-wide instruction set with only 33 single-word instructions, delivering highly symmetrical code that compresses 2:1 over competing 8-bit microcontrollers of its class. The LC variant is favored for battery-powered applications because of its wide operating voltage range and low quiescent current consumption. Key features include 12 I/O pins arranged across two ports (Port A: 4 lines, Port B: 8 lines), a hardware 8-bit timer/counter (TMR0) with an 8-bit programmable prescaler, watchdog timer with its own on-chip RC oscillator for reliable operation, power-on reset, power-saving sleep mode, and a four-channel 8-bit A/D converter interface path. The device executes most instructions in a single 200 ns cycle at 4 MHz, giving roughly 5 MIPS of throughput. Code protection prevents unauthorized reads of the OTP contents via in-circuit programming safeguards. The PIC16LC57C uses an OTP EPROM cell array as program memory (note: not a true UV-erasable windowed part - the JW/CL packages are the windowed versions for prototype development, while the SO and P packages are OTP-only). The "C" revision of the silicon adds improved brown-out and reset behavior compared with the earlier "A" and "B" revisions. Built around Microchip's enhanced PIC 16C5X core, the device integrates a high-performance RISC CPU with separate instruction and data buses, eliminating the von Neumann bottleneck seen in simpler 8-bit controllers. Typical applications include consumer white goods and appliance controllers, low-end remote controls, simple sensor signal conditioning, battery chargers, LED lighting controllers, toys, and small automotive subsystems such as interior lighting and seat controllers. The wide 2.5 V to 5.5 V supply range also makes it suitable for direct 2xAA / 2xAAA battery-powered products. Because of its small footprint, low cost, and mature toolchain (MPLAB IDE + PICSTART Plus / ICD programmers), the PIC16LC57C is a common choice for cost-sensitive high-volume products where a small 8-bit core is sufficient. When designing with this part, remember that OTP memory cannot be re-programmed in the field; for development, use the JW (windowed CERDIP) variant and erase with UV before committing to OTP SOIC for production. Ensure decoupling capacitors of 0.1 µF are placed close to VDD/VSS pins, and confirm that your selected crystal or RC oscillator is within the 4 MHz maximum. The "I" industrial temperature grade makes it suitable for most non-automotive applications; for AEC-Q100 automotive projects, evaluate a more recent flash-based PIC16F1xx instead. This page synthesizes distributor pricing from DigiKey, Mouser, LCSC and Octopart, plus drop-in same-package alternatives and practical design notes not found in the bare Microchip datasheet.

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PIC16LC57C-04I/SP

PIC16LC57C-04I/SP - 3KB OTP 8-bit MCU, 4MHz, SPDIP-28 | Microchip

The Microchip PIC16LC57C-04I/SP is an 8-bit CMOS RISC microcontroller from the PIC16C5X family, offered in a 28-pin SPDIP (Skinny Plastic DIP) through-hole package. The device integrates 2KB (3KB equivalent) of One-Time-Programmable (OTP) EPROM program memory and 72 bytes of RAM, executes instructions in a 200 ns single-cycle time at 4 MHz, and provides 20 digital I/O pins across two ports (PORTA and PORTB). What is a PIC16C5X microcontroller? The PIC16C5X family is Microchip Technology's foundational low-cost, high-performance 8-bit fully-static EPROM/ROM-based CMOS microcontroller line, employing a RISC architecture with only 33 single-word/single-cycle instructions. In the broader taxonomy, it sits as: 8-bit microcontroller -> RISC MCU -> embedded controller -> semiconductor IC. These devices target cost-sensitive 8-bit embedded designs where deterministic instruction timing and minimal external component count are priorities. The PIC16LC57C variant operates from 3.0V to 6.25V (the "LC" prefix indicates low-voltage/low-power CMOS) with an industrial temperature range of -40C to +85C (the "I" suffix). The "-04" speed grade denotes 4 MHz maximum oscillator frequency. The device features a watchdog timer, power-on reset, and 8-bit real-time counter/capacitive discharge oscillator. Unlike the UV-erasable CERDIP-18 variant, the SP package is a plastic OTP device intended for production volumes. Key architecture features include a 12-bit instruction word, two 8-bit I/O ports (RA and RB), 8-bit timer with programmable prescaler, and a hardware comparator. The Harvard-style separate program/data buses enable simultaneous instruction fetch and data access, supporting the 33-instruction RISC instruction set. Typical applications include consumer appliance controls, simple sensor interfaces, automotive body electronics (non-safety), battery-powered instruments, and low-cost replacement of discrete logic. The 4 MHz clock and compact instruction set suit real-time control loops with deterministic timing. Design consideration: The PIC16LC57C uses a 12-bit core, so code compiled for PIC16F1xxx or PIC18 devices is NOT compatible - confirm your toolchain (MPASM/MPASMX or XC8 legacy mode) targets the 16C5X core before reusing firmware. This page synthesizes distributor pricing, pin-compatible PIC16C5X family alternatives, and practical design notes not collected in a single manufacturer table.

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PIC16LC57CT-04/SO

PIC16LC57CT-04/SO - 8-Bit OTP MCU, 4MHz, 3KB | Microchip

The Microchip Technology PIC16LC57CT-04/SO is an 8-bit PIC16C5X-family CMOS microcontroller built around a RISC architecture, delivering 4 MHz maximum clock speed with 3 KB (2K x 12) of One-Time Programmable (OTP) program memory and 72 bytes of RAM, housed in a 28-pin SOIC surface-mount package. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral I/O on one silicon die. Within the broader semiconductor hierarchy, microcontrollers belong to the embedded computing category, sitting alongside microprocessors, DSPs, and FPGAs. The PIC16C5X family specifically targets cost-sensitive 8-bit applications where deterministic instruction execution, low power, and small footprint outweigh the need for high computational throughput. PIC16C5X MCUs use a 12-bit instruction word (vs. 14-bit for mid-range PICs), which simplifies the decoder logic and keeps die size minimal. Key features of the PIC16LC57CT-04/SO include 20 digital I/O pins organized across three ports (RA, RB, RC), two 8-bit timer/counters, a watchdog timer with on-chip RC oscillator, power-on reset, and code protection. The device supports an operating voltage range of 3.0 V to 6.25 V with a commercial temperature range of 0 °C to +70 °C. Its CMOS process combined with sleep mode delivers very low standby current for always-on appliances. The LC suffix in the part number designates the low-power CMOS process variant, distinguishing it from the standard PIC16C57 (which uses EPROM/UV erasable memory) and from the PIC16CR57 (which uses mask ROM). The T suffix indicates Tape & Reel packaging, while -04 denotes the 4 MHz speed grade. All PIC16C5X family members share a common instruction set and pinout, simplifying code portability across family members. Typical applications include consumer appliances, simple motor control, automotive body electronics, security alarm panels, and low-cost remote-control transmitters. The 12-bit-wide OTP memory allows cost-optimized one-time programming in volume production without the tooling cost of mask ROM. The 28-SOIC package also supports automated pick-and-place assembly for medium-volume production runs. When designing with this part, ensure your development strategy accounts for OTP memory limitations - since OTP can only be programmed once, code must be fully validated on an emulator or windowed CERDIP version (PIC16C57/JW) before committing to production. Brown-out detection and watchdog timer should be enabled for unattended installations. This page synthesizes distributor pricing, drop-in alternatives from the PIC16C5X family, and practical design notes not found in the manufacturer datasheet.

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PIC16LC57CT-04/SS

PIC16LC57CT-04/SS - 8-Bit 4MHz OTP MCU 3KB | Microchip

The Microchip Technology PIC16LC57CT-04/SS is an 8-bit, fully-static, EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, delivering 4 MHz CPU clock speed with 3 KB (2K x 12) of One-Time-Programmable (OTP) program memory in a 28-pin SSOP surface-mount package. It features 20 digital I/O lines, Power-On Reset (POR), Watchdog Timer (WDT), and a 5 V operating supply, providing a baseline cost-optimized RISC controller for low-to-mid complexity embedded applications. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral I/O onto one silicon die, allowing it to read sensors, drive outputs, and execute user firmware without external logic. Within the broader taxonomy, the PIC16C5X family sits in the 8-bit RISC MCU segment, alongside other legacy PIC microcontrollers that prioritized deterministic instruction execution and code density (12-bit wide instructions yield roughly 2:1 code compression over 8-bit-wide instruction MCUs of the same era). The 'LC' prefix indicates the low-power CMOS process variant designed for battery-aware designs, and the 'T' suffix indicates tape-and-reel packaging. Key features of the PIC16LC57CT-04/SS include 4 MHz maximum operating frequency (the '04' speed grade), 3 KB OTP program memory organized as 2K x 12, a Harvard RISC architecture with only 33 single-word/ single-cycle instructions, 20 general-purpose digital I/O pins multiplexed with peripheral functions, an internal Power-On Reset, a Watchdog Timer for runaway code recovery, and a commercial temperature grade. The OTP memory allows one-time field programming using standard EPROM programmers, which is useful for low-volume production or design validation before ROM mask versions are ordered. Architecturally, the PIC16C5X uses a 12-bit instruction word with a two-stage pipeline, where every instruction (except branches) executes in one oscillator cycle, giving 4 MIPS at 4 MHz clock. The 8-bit ALU operates on a 7-level hardware stack for subroutine nesting, and 25 special-function registers control I/O and peripheral configuration. Compared with 8051-class MCUs of the same era, the PIC16C5X delivers significantly higher code density and a much smaller die footprint, but lacks on-chip Flash and modern peripherals such as UART, ADC, or PWM hardware. Typical applications for this device include legacy industrial control logic, appliance controllers, sensor signal conditioning front-ends, simple state machines, and educational or hobby projects where a 4 MHz 8-bit controller is sufficient. It is also used as a cost-down mask-ROM alternate to higher-end PIC microcontrollers in volume production. When designing with the PIC16LC57CT-04/SS, note that OTP memory cannot be re-programmed in-circuit; develop code on a windowed (UV-erasable) or flash-based PIC variant and validate firmware completely before ordering OTP parts. The device is now considered legacy; verify long-term availability before committing to new designs. This page synthesizes verified distributor pricing, parametric data, same-brand drop-in alternatives within the PIC16C5X family, and practical design notes not consolidated in the manufacturer datasheet.

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PIC16LC558T-04I/SS - 4MHz 8-Bit OTP MCU, 20-SSOP | Microchip

PIC16LC55A-04/SS - 8-bit OTP MCU, 768B, 20 I/O, SSOP-28 | Microchip

PIC16LC55A-04I/SO - 8-bit OTP MCU, 4MHz, 768B | Microchip

PIC16LC55A-04I/SS - 8-bit CMOS MCU, 768B OTP, 4MHz, SSOP-28 | Microchip

PIC16LC55AT-04/SO - 8-bit OTP MCU, 4MHz, 28-SOIC | Microchip

PIC16LC55AT-04/SS - 4MHz 768B OTP 8-bit MCU 28-SSOP | Microchip

PIC16LC56A-04/P - 4MHz 8-Bit CMOS MCU, 1.5KB EPROM | Microchip

PIC16LC56A-04/SO - 1.5KB OTP 8-bit MCU 4MHz SOIC-18 | Microchip

PIC16LC56A-04/SS - 1.5KB OTP MCU, 4MHz, 12 I/O SSOP20 | Microchip

PIC16LC56A-04I/P - 8-Bit 1.5KB OTP MCU, 4MHz, 18-PDIP | Microchip

PIC16LC56A-04I/SO - 8-Bit 4MHz OTP MCU 1.5KB | Microchip

PIC16LC56A-04I/SS - 4MHz 8-bit OTP MCU, 1.5KB | Microchip

PIC16LC56AT-04/SO - 8-Bit 4MHz OTP MCU, 1.5KB | Microchip

PIC16LC56AT-04I/SO - 4MHz 8-bit OTP MCU, 1.5KB, 18-SOIC | Microchip

PIC16LC56AT-04I/SS - 8-bit 4MHz OTP MCU 1.5KB | Microchip

PIC16LC57C-04/P - 4MHz 8-bit CMOS MCU, 3KB EPROM, 20 I/O | Microchip

PIC16LC57C-04/SO - 8-Bit 4MHz OTP MCU 3KB | 28-SOIC

PIC16LC57C-04/SP - 8-Bit 4MHz OTP MCU, 3KB | Microchip

PIC16LC57C-04/SS - 8-Bit MCU 3KB OTP 4MHz 28-SSOP | Microchip

PIC16LC57C-04I/P - 8-Bit 4MHz OTP MCU 3KB | Microchip | DIP-28

PIC16LC57C-04I/SO - 8-Bit 4MHz OTP MCU 28-SOIC | Microchip

PIC16LC57C-04I/SP - 3KB OTP 8-bit MCU, 4MHz, SPDIP-28 | Microchip

PIC16LC57CT-04/SO - 8-Bit OTP MCU, 4MHz, 3KB | Microchip

PIC16LC57CT-04/SS - 8-Bit 4MHz OTP MCU 3KB | Microchip