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PIC16HV785-E/SO

PIC16HV785-E/SO - 8-Bit MCU, 3.5KB Flash, 20-SOIC | Microchip

The Microchip Technology PIC16HV785-E/SO is a 20-pin flash-based 8-bit CMOS microcontroller from the PIC16 mid-range family, integrating a wide-voltage shunt regulator, dual high-speed comparators, and dual operational amplifiers on-chip, housed in a 20-SOIC (0.295 inch / 7.50 mm width) package. The "HV" suffix denotes an integrated high-voltage shunt regulator that lets the device run directly from supplies up to 15 V without an external 5 V regulator, while the "E" temperature grade marks the enhanced industrial range of -40 C to +125 C. What is a PIC16 mid-range 8-bit microcontroller? It is a RISC-architecture MCU from Microchip that executes one instruction per clock cycle (excluding branches) using a Harvard memory layout with separate program and data buses. The PIC16HV785 specifically belongs to a hybrid family that pairs the standard PIC16F785 mid-range core with an integrated high-voltage shunt regulator, eliminating the need for an external 5V LDO when powered from 12 V or 24 V rails. This product family (PIC16HV785) sits within the broader PIC16 -> PIC mid-range -> 8-bit microcontroller -> microcontroller -> embedded MCU -> semiconductor hierarchy. Key features of the PIC16HV785 include 3.5 KB of flash program memory, 256 bytes of RAM, a 20 MHz internal oscillator equivalent (8 MHz FOSC with 4x PLL, or external crystal), two on-chip op-amps, two high-speed comparators with a programmable reference, a 14-bit resolution Enhanced Capture/Compare/PWM (ECCP) module plus a standard CCP, 10-bit ADC with up to 12 channels, and an integrated high-voltage shunt regulator accepting 3.5 V to 15 V on Vdd with the HV pin sinking excess current to ground. The device supports In-Circuit Serial Programming (ICSP) via PGD/PGC pins and offers nanoWatt power management with multiple idle and sleep modes. The architecture is built on a RISC core with 35 single-word instructions and a 14-bit instruction word. Compared to the PIC16F785 (which lacks the HV regulator), the PIC16HV785 trades analog flexibility for integrated high-voltage tolerance, making it a single-chip solution for switching power supply control, LED drivers, and battery chargers. The ECCP module supports half-bridge, full-bridge, and multi-phase PWM topologies essential for offline and DC-DC converter designs. Typical applications include offline and AC-DC switched-mode power supplies (SMPS) using the on-chip comparators for primary-side regulation, LED lighting drivers with analog dimming via the op-amps, sealed lead-acid battery chargers, motor control subsystems, and any 12 V or 24 V industrial node that benefits from the integrated HV regulator. The on-chip analog peripherals minimize external component count, which is critical for cost-sensitive power electronics. A key design consideration is that the HV shunt regulator regulates by sinking excess current, so the input supply must provide adequate headroom current; bulk decoupling of at least 1 uF on Vdd and a low-ESR capacitor on the HV pin are required for stable regulation. The ECCP module's dead-band control and the comparator programmable hysteresis should be configured in firmware to match the chosen topology (buck, boost, flyback, or PFC). This page synthesizes Microchip datasheet specifications, real distributor pricing and stock as of 2026-09-22, drop-in alternatives within the PIC16HV785 family, and practical design notes for power-supply topologies not consolidated in any single source.

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PIC16HV785-E/SS

PIC16HV785-E/SS - 8-Bit MCU, 20MHz, 3.5KB Flash, 20-SSOP | Microchip

The Microchip Technology PIC16HV785-E/SS is an 8-bit Flash-based CMOS microcontroller with integrated high-voltage (HV) shunt regulator support, dual operational amplifiers, and dual high-speed comparators, delivering 20MHz CPU performance in a 20-pin SSOP package. It includes 3.5KB (2K x 14) of Flash program memory, 128 bytes of RAM, and 18 digital I/O pins. The PIC16HV785 is part of the PIC16F/HV mid-range family and is optimized for closed-loop analog control applications. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash/ROM), data memory (RAM), and peripherals on one silicon die. MCUs belong to the broader category of microcontrollers, which fall under embedded processors, semiconductors, and integrated circuits. The 8-bit architecture executes instructions one byte (or one word) at a time, making it cost-effective and deterministic for low-power control tasks. Key features include a two-phase asynchronous feedback PWM module, two on-chip op-amps with rail-to-rail inputs, two high-speed comparators with programmable reference, internal 8MHz oscillator, and an integrated shunt regulator supporting operation directly from 3.5V to 15V supplies without an external regulator. The device supports In-Circuit Serial Programming (ICSP) and In-Circuit Debug (ICD). The PIC16HV785 uses a RISC-style Harvard design with 35 single-word instructions, providing deterministic interrupt response and low interrupt latency. The on-chip op-amps can be configured for active filtering, current sensing, or signal conditioning, while the comparators support overcurrent and zero-cross detection. Together they enable compact, single-chip SMPS, LED driver, and motor-control implementations. Typical applications include DC-DC converters, LED lighting drivers, battery chargers, solar micro-inverters, motor control, and intelligent power management. The HV regulator eliminates an external LDO, reducing BOM cost in line-powered embedded designs. When designing with this MCU, the on-chip op-amps have limited output swing and bandwidth - check the analog loop bandwidth against the switching frequency of the converter. Use the MSSP module for SPI/I2C peripheral expansion where additional memory or DACs are required. This page synthesizes distributor pricing, drop-in pin-compatible alternatives (PIC16F785, PIC16HV785-I/SS, PIC16HV785-I/SO), and practical design notes not found in the manufacturer datasheet.

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PIC16HV785-I/SS

PIC16HV785-I/SS - 20MHz 8-bit MCU 3.5KB Flash 20-SSOP | Microchip

The Microchip Technology PIC16HV785-I/SS is an 8-bit PIC mid-range microcontroller with 3.5KB (2K x 14) of Flash program memory, 128 bytes of RAM, and 18 digital I/O pins, housed in a 20-pin SSOP package. The "HV" prefix indicates an integrated shunt voltage regulator, enabling direct operation from a 2.0V-15V supply without external regulation. The device runs at up to 20 MHz instruction rate and includes dual operational amplifiers, dual high-speed comparators, an Enhanced Capture/Compare/PWM module, and a Two-Phase Asynchronous Feedback PWM controller on-chip. An 8-bit microcontroller (MCU) is a small computer-on-a-chip that integrates a CPU, program memory (Flash/ROM), data memory (RAM), and peripheral interfaces on a single die. Within the broader taxonomy, the PIC16HV785 sits in the 8-bit MCU class, which belongs to the microcontroller family, itself a subcategory of microcontrollers -> microprocessors -> digital ICs -> semiconductors. 8-bit MCUs dominate cost-sensitive, low-power, deterministic-control applications such as motor drive, lighting, and simple sensor conditioning because they offer predictable instruction timing, low current draw, and easy programming via the ICSP interface. Key features include one 10-bit ADC with 14 channels, one 8-bit ADC with 14 channels, two op-amps with 3 MHz gain bandwidth, two comparators with a 40 ns response time, an internal 31 kHz oscillator, and a hardware Two-Phase Asynchronous Feedback PWM block targeting switch-mode power supply (SMPS) and full-bridge converter topologies. The integrated shunt regulator accepts 2.0V-15V at the HV pin and delivers a regulated 3.3V or 5V (selectable via CONFIG) to the internal logic, simplifying power design in battery and bus-powered systems. The PIC16HV785 architecture implements the Microchip mid-range 14-bit instruction set with a single accumulator W and a 16-deep hardware stack. Peripherals share I/O pins via PPS-like multiplexers; the on-chip op-amps can be cascaded with the PWM comparators to implement current-mode control loops with no external analog components. Typical applications include primary-side control of AC-DC or DC-DC converters, LED lighting drivers, battery chargers, BLDC motor commutation, and industrial sensor signal conditioning. Because the "HV" variant integrates a shunt regulator, it is preferred over the non-HV PIC16F785 in 12V bus designs. When designing with this part, ensure the HV supply current limit resistor is sized per the datasheet's shunt regulator curve, otherwise the regulator will enter foldback. For SMPS designs, the Two-Phase Asynchronous Feedback PWM block requires external MOSFET drivers because the GPIO cannot directly drive power FETs above a few hundred milliamps. This page consolidates distributor stock, parametric drop-in equivalents, and application guidance synthesized from the Microchip PIC16HV785 datasheet, Mouser/DigiKey listings, and PIC family reference designs.

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PIC16HV785T-I/ML

PIC16HV785T-I/ML - 8-Bit 20MHz 3.5KB Flash MCU w/ Shunt Regulator | Microchip

The Microchip Technology PIC16HV785T-I/ML is an 8-bit Flash-based CMOS microcontroller from the PIC16F family, integrating a built-in shunt voltage regulator that allows direct operation from high-voltage rails up to 15V without an external regulator. Housed in a 20-pin QFN (4x4 mm) package, it runs at 20 MHz instruction rate with 3.5 KB (2K x 14) of Flash program memory and 128 bytes of RAM, targeting mixed-signal applications such as lighting, battery charging, and power conversion. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash/ROM), data RAM, and peripheral set on one die; the PIC16 family uses a 14-bit wide instruction word and Harvard architecture, providing deterministic single-cycle execution for embedded control loops. The PIC16F785 specifically adds analog peripherals - two op-amps, two high-speed comparators, a 12-channel 10-bit ADC, and a two-phase asynchronous feedback PWM - that make it a system-on-chip for closed-loop analog control. The HV prefix denotes the integrated shunt regulator. Key specifications include 18 digital I/O pins, a wide operating voltage range driven by the internal shunt regulator, an internal 8 MHz oscillator with PLL options, NanoWatt power management for low standby current, on-chip EEPROM emulation, and an enhanced mid-range core with 33 instructions. The 20-QFN (4x4) package measures 4x4 mm with a thermal pad, enabling compact PCB layouts in space-constrained designs. The on-chip shunt regulator is the architectural differentiator: a typical PIC requires a regulated 2.0-5.5 V supply, but the HV785 can accept an unregulated high-voltage input (up to 15 V) and internally derive the core logic supply through a parallel-pass (shunt) topology, similar to a Zener reference. The two op-amps and comparators can be wired into closed-loop current-mode or voltage-mode control, while the two-phase PWM drives synchronous buck/boost/SEPIC stages. This integration removes external regulator and analog components, reducing BOM cost and PCB area for SMPS and LED driver designs. Typical applications include LED lighting drivers (constant-current buck/boost), battery chargers (CC/CV topologies), DC-DC converters (buck, boost, SEPIC, flyback), motor control for low-power BLDC fans, and smart power modules. The combination of analog + PWM + high-voltage input suits any closed-loop power-conversion design. When designing with the PIC16HV785, ensure the shunt regulator has a current-limiting resistor or active pass element rated for the input voltage, since the shunt sinks the difference between input current and MCU current. The op-amp outputs share package pins with comparator inputs - review the pin allocation table in the datasheet carefully. For firmware development, Microchip's MPLAB X IDE with XC8 compiler and PICkit programmers are the standard toolchain. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design considerations not found in the manufacturer datasheet alone - a complete engineering reference for selecting the PIC16HV785T-I/ML for next-generation lighting, charging, and power-conversion designs.

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PIC16HV785T-I/SS

PIC16HV785T-I/SS - 20MHz 8-Bit MCU 3.5KB Flash 20-SSOP | Microchip

The Microchip Technology PIC16HV785T-I/SS is an 8-bit Flash-based CMOS microcontroller (MCU) from the PIC16HV785 family, integrating an on-chip shunt voltage regulator that allows direct operation from supply voltages up to 15V without external regulation. The device features a 20MHz instruction clock, 3.5KB (2K x 14 words) of Flash program memory, 128 bytes of RAM, and 256 bytes of EEPROM, packaged in a 20-pin Shrink Small-Outline Package (20-SSOP) suitable for space-constrained industrial and consumer designs. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, working RAM, non-volatile EEPROM, and integrated peripherals such as timers, comparators, ADCs, and communication interfaces. The PIC16HV785 belongs to the mid-range PIC16F family (PIC16 -> PIC mid-range 8-bit MCU -> 8-bit microcontroller -> microcontroller -> semiconductor IC), distinguished by its integrated dual op-amps, dual high-speed comparators, two-phase asynchronous feedback PWM, and 12-bit ADC - making it a peripheral-rich mixed-signal MCU optimized for power-conversion feedback loops. Key features include an integrated shunt regulator (HV variant), 18 digital I/O pins, 10-bit ADC with multiple input channels, two on-chip operational amplifiers, two high-speed comparators with programmable reference, a 14-bit PWM module with complementary outputs, and a 20MHz internal oscillator. The HV internal regulator tolerates 3.5V to 15V VDD and simplifies design by removing the external 5V LDO in many applications. The PIC16HV785 uses a RISC Harvard architecture with 35 single-word instructions, providing deterministic interrupt response and 200ns instruction cycle at 20MHz. On-chip in-circuit serial programming (ICSP) enables firmware updates after PCB assembly, and the wide 2.0V-15V (logic) operating range supports both 3.3V and 5V/12V system rails typical in lighting, motor control, and battery management. Typical applications include LED lighting drivers, DC-DC converter control, battery chargers, switched-mode power supplies (SMPS), fan and pump motor control, and industrial sensor signal conditioning. The combination of integrated op-amps, comparators, and PWM makes the PIC16HV785 especially well-suited to closed-loop control where feedback divider and current-sense amplification are performed on-chip. When designing with this part, take care to size the shunt regulator resistor according to total current draw and supply voltage to maintain a stable internal rail. Decouple VDD with 100nF and 10uF capacitors placed close to the IC, and reserve the ICP/ICSP pins for in-circuit programming access. This page synthesizes distributor pricing, drop-in alternative listings, and practical design notes beyond the manufacturer datasheet to support sourcing and BOM decisions.

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PIC16LC432-I/P

PIC16LC432-I/P - 8-bit MCU, 3.5KB OTP, 12 I/O | Microchip

The Microchip Technology PIC16LC432-I/P is an 8-bit CMOS microcontroller from the PIC16C family, featuring a 20 MHz maximum clock speed, 3.5 KB (2K x 14) of One-Time Programmable (OTP) program memory, and 128 x 8 bytes of RAM, housed in a 20-pin PDIP (0.300 inch, 7.62 mm) through-hole package with 12 general-purpose digital I/O pins. An 8-bit microcontroller is a single-chip computer that integrates an 8-bit CPU core, program memory (ROM/OTP/Flash), data memory (RAM), and peripherals on a single die. The PIC16LC family uses a Harvard RISC architecture with a reduced instruction set of 35 single-word instructions, executing one instruction per clock cycle (excluding branches). This 8-bit MCU sits within the broader taxonomy: microcontroller -> embedded MCU -> semiconductor -> integrated circuit. The 'L' in PIC16LC432 indicates the low-power CMOS variant of the PIC16C432 OTP family, intended for battery-friendly designs versus the standard PIC16C432. Key features include a 20 MHz operating frequency, 14-bit instruction word, 8-bit data path, integrated Brown-out Detect/Reset (BOR), Power-On Reset (POR), Watchdog Timer (WDT) with on-chip RC oscillator, and dual oscillator support (external RC or LP/XT/HS crystal). The device operates across a wide 2.5V-6.0V Vdd range typical of the LC variant and supports in-circuit serial programming (ICSP) via the RB6/RB7 pins. The PIC16LC432-I/P uses Microchip's enhanced mid-range core architecture with a 14-bit program counter that can address up to 8K x 14 of program memory. The OTP memory is factory-programmable once, making this part suitable for mature low-volume production where firmware is fixed. The core integrates a hardware multiplier-free ALU and 8-level deep hardware stack, with interrupt handling through a single-vector or multi-source scheme. Typical applications include industrial control logic, automotive body modules, simple sensor interface boards, appliance control panels, and battery-powered remote sensors that need a low-power 8-bit MCU with a small package and basic analog/digital peripherals. The 20-pin PDIP package also supports easy breadboard prototyping and educational/hobbyist use. When designing with this part, consider that OTP memory cannot be re-programmed; for development, use the PIC16F432 or PIC16C432 JW (windowed) variants. Ensure decoupling is placed close to Vdd and that MCLR is pulled high through a resistor for proper reset behaviour. The 12 I/O pins are shared with peripheral functions, so plan pin allocation carefully. This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design notes that go beyond what the manufacturer datasheet alone provides, helping engineers evaluate the PIC16LC432-I/P for both new designs and legacy maintenance.

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PIC16LC505-04/P

PIC16LC505-04/P - 1.5KB EPROM 8-bit MCU | Microchip | 14-PDIP

The Microchip Technology PIC16LC505-04/P is a 14-pin, 8-bit CMOS RISC microcontroller housed in a 14-pin PDIP (0.300 inch, 7.62 mm) through-hole package. Built on Microchip's PIC 16C/LC505 architecture, the device integrates 1.5 KB (1K x 12) of One-Time-Programmable (OTP) program memory, 72 bytes of RAM, and 12 general-purpose digital I/O pins, all driven by a 4 MHz internal operating clock. The 12-bit wide instruction set delivers highly symmetric, 2:1 code compression versus typical 8-bit competitors, while the 33 single-word instruction RISC core achieves 200 ns instruction execution at 4 MHz. An 8-bit microcontroller (MCU) is a single-chip microcomputer integrating a CPU, RAM, non-volatile program memory, timers/counters, and I/O peripherals on a single CMOS die. Within the broader taxonomy, the PIC16LC505 sits at: 8-bit MCU -> RISC microcontroller -> embedded controller -> microcontroller -> semiconductor IC. The 'LC' suffix denotes a low-voltage CMOS variant optimized for 2.5 V to 5.5 V operation, while the '04' suffix indicates the 4 MHz maximum clock speed. Key features include In-Circuit Serial Programming (ICSP), Power-on Reset (POR), Device Reset Timer (DRT), a Watchdog Timer (WDT) with a dedicated on-chip RC oscillator, programmable code protection, and internal weak pull-ups on I/O pins. The EPROM-based program memory allows prototype and small-volume production while retaining full PIC architectural compatibility with mask-ROM PIC16C505 variants, easing long-term firmware portability. The architecture combines a 12-bit instruction word with a Harvard-style separate program and data bus, executed by a two-stage pipeline. At 4 MHz, instruction throughput is 5 MIPS with deterministic 200 ns single-cycle execution; the device operates over a 2.5 V to 5.5 V range and an industrial temperature span of -40 C to +85 C (industrial grade). Typical applications include low-cost consumer appliances, battery-powered remote sensors, LED driver controllers, simple motor control logic, and educational/hobbyist embedded platforms where through-hole PDIP is preferred for breadboard or hand-soldered prototyping. Design consideration: although the LC variant tolerates down to 2.5 V, EEPROM/EPROM write and programming operations require VDD within the upper half of the supply range; ensure decoupling with a 0.1 uF ceramic capacitor placed within 5 mm of VDD/GND. This page synthesizes distributor pricing, drop-in alternatives, parametric comparisons, and practical design notes that complement the manufacturer datasheet.

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PIC16LC505-04I/SL

PIC16LC505-04I/SL - 4MHz 8-Bit OTP MCU, 1.5KB | Microchip

The Microchip Technology PIC16LC505-04I/SL is an 8-bit CMOS microcontroller from the PIC16C5xx family, featuring a 4 MHz maximum operating frequency, 1.5 KB (1K x 12) of One-Time-Programmable (OTP) program memory, 72 bytes of RAM, and 12 digital I/O pins, housed in a 14-pin SOIC package. The "LC" suffix indicates a low-voltage (2.5V to 5.5V) variant designed for battery-friendly applications, while "-04" specifies the 4 MHz speed grade and "I" denotes the industrial temperature range (-40C to +85C). An 8-bit PIC microcontroller is a compact, deterministic RISC processor that executes one instruction per instruction cycle (4 clock cycles) and uses a Harvard architecture with separate program and data buses. The PIC16C5xx family is the low-pin-count, low-cost foundation of the PIC microcontroller lineup and remains popular in cost-sensitive, high-volume embedded designs where simplicity and predictable timing outweigh the need for large memory or advanced peripherals. Key features include 12 I/O pins with individually programmable direction, a programmable Watchdog Timer for unattended operation, an 8-bit Timer/Counter, and power-saving SLEEP mode with wake-up via interrupt. The device supports in-circuit serial programming (ICSP) via two pins, allowing OTP programming at the factory. The 12-bit wide instruction set is symmetrical, typically achieving 2:1 code compression over competing 8-bit MCUs in the same price class, while the easy-to-remember instruction set shortens development time. Typical applications include low-cost consumer electronics, battery-powered devices such as remote controls and toys, simple sensor interfaces, white-goods control boards, LED lighting controllers, and small appliance controls. The wide 2.5V to 5.5V operating range allows direct connection to a single Li-ion cell or two alkaline cells with no additional regulation. When designing with this part, allocate GPIO pins carefully - only 12 are available and some are multiplexed with the ICSP and Timer functions. Because this is an OTP device, firmware must be 100% validated in prototype Flash equivalents (such as the PIC16F505) before committing to mask production; OTP cannot be erased or rewritten.

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PIC16LC505T-04/SL

PIC16LC505T-04/SL - 8-Bit OTP MCU 1.5KB 4MHz SOIC-14 | Microchip

The Microchip Technology PIC16LC505T-04/SL is an 8-bit CMOS RISC microcontroller from the PIC16C/LC505 family, featuring 1.5KB (1K x 12) One-Time-Programmable (OTP) program memory and 72 bytes of RAM, housed in a 14-pin SOIC package supplied on tape and reel. The device operates at up to 4MHz clock speed from a 3.3V/5V supply and provides 12 general-purpose digital I/O pins, an integrated Watchdog Timer with a dedicated on-chip RC oscillator, Power-on Reset, Device Reset Timer, In-Circuit Serial Programming, programmable code protection, and internal weak pull-ups on I/O pins. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and peripheral I/O on one die. The PIC16C/LC505 family belongs to Microchip's PIC RISC architecture, whose reduced instruction set (33 single-word instructions) executes most instructions in a single instruction cycle, giving it a deterministic timing profile well suited to cost-sensitive real-time control. The 'LC' prefix denotes the low-voltage CMOS variant, allowing operation down to roughly 2.5V versus the standard 16C's 4.5V minimum. Key features include 12 I/O pins with individually selectable direction, wake-up from sleep on I/O pin change, a 5-bit prescaler shared between WDT and Timer0, and low-power sleep mode that drops quiescent current into the microamp range. The 14-pin SOIC footprint measures 3.90mm body width and is one of the broadest SMD footprints in the 14-pin class, simplifying hand-soldering and inspection. The PIC16LC505 uses a Harvard architecture with separate program and data buses, a 12-bit program word, and a single 8-bit working register plus 24 general-purpose SRAM registers. Its OTP program memory is programmed via ICSP, allowing firmware to be written after PCB assembly and eliminating the need for a pre-programmed ROM. Typical applications include low-cost consumer appliances, battery-powered remote controls, simple sensor signal conditioning, automotive body electronics sub-modules, and standalone replacement of discrete logic. With only 1.5KB of code space, the part targets applications whose firmware footprint is below approximately 1000 instruction words. When designing with this part, plan for an external oscillator or resonator since the datasheet specifies external oscillator type for -04 speed grade. OTP memory cannot be reprogrammed, so choose the FLASH-based PIC16F505 or PIC10F200 family if in-field firmware updates are required. This page synthesizes distributor pricing, drop-in Microchip alternatives, and practical design notes not found in the manufacturer datasheet alone, helping engineers select and qualify the right PIC16C/LC505 variant for cost-sensitive 8-bit embedded designs.

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PIC16LC505T-04I/SL

PIC16LC505T-04I/SL - 8-bit OTP MCU, 1.5KB, 12 I/O | Microchip

The Microchip Technology PIC16LC505T-04I/SL is an 8-bit CMOS microcontroller based on Microchip's PIC® 16C RISC architecture, offering 1.5KB (1K x 12) of One-Time-Programmable (OTP) program memory, 72 bytes of RAM, 12 digital I/O pins, and a 4 MHz maximum operating frequency in a 14-pin SOIC package with industrial temperature grade. The "LC" prefix denotes a low-voltage (2.5V-5.5V) core designed for 3.3V/5V dual-supply applications, while the "-04" speed grade specifies 4 MHz operation with 200 ns instruction cycle time. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + data), and programmable I/O peripherals. The PIC16C505 family belongs to the 8-bit mid-range microcontrollers -> microcontrollers -> integrated circuits -> semiconductors hierarchy, with a RISC instruction set using only 33 single-word instructions that simplifies firmware development and accelerates time-to-market. This OTP variant is suited to volume production where code is finalized and no in-field re-programming is required, distinguishing it from the Flash-based PIC16F505 cousin. Key features include In-Circuit Serial Programming (ICSP™) for programming after PCB assembly, Power-on Reset (POR) and Device Reset Timer (DRT) for clean startup, a Watchdog Timer (WDT) with dedicated on-chip RC oscillator for reliable operation, programmable code protection to lock firmware against readback, internal weak pull-ups on I/O pins, and wake-up from sleep on pin change. The industrial temperature range (-40°C to +85°C) makes the device suitable for harsh-environment deployments. The PIC16LC505 uses a Harvard architecture with separated program and data buses, enabling single-cycle instruction fetch and execution. Its 14-bit instruction word and 8-bit data path deliver compact code density, while the 33-instruction RISC core achieves predictable timing that simplifies real-time control loops. The 4 MHz oscillator supports external clock/crystal/RC modes depending on application requirements. Typical applications include consumer appliance control, sensor interface modules, LED lighting controllers, low-cost motor control, and battery-powered remote sensor nodes. The wide 2.5V-5.5V operating range plus low-power sleep modes (wakeup-on-change) make it ideal for energy-harvesting or always-on embedded designs. When designing with this part, note that OTP memory cannot be erased - prototype with the Flash-based PIC16F505-I/SL and migrate to the LC505 for production. Decoupling: place a 100 nF ceramic capacitor as close as possible to VDD, and consider a 10 µF bulk capacitor on the supply rail. Ensure the MCLR pin has proper reset-circuit design per the datasheet. This page synthesizes distributor pricing from DigiKey and Mouser, datasheet-verified specifications, drop-in same-package alternatives (PIC16LC505-04I/SL, PIC16C505 variants), and engineering design notes not consolidated in the manufacturer datasheet alone.

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PIC16LC54A-04/P

PIC16LC54A-04/P - 4MHz 8-Bit OTP MCU 18-PDIP | Microchip

The Microchip Technology PIC16LC54A-04/P is an 8-bit RISC microcontroller from the PIC16C5x family, delivering 4 MHz CPU performance with 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory in an 18-pin PDIP (Plastic DIP) through-hole package. It operates from a 3 V to 6.25 V supply and is rated for the commercial temperature range of 0C to +70C. With 12 digital I/O lines, 25 bytes of RAM, a single 8-bit timer/counter (TMR0), and a 2-level hardware stack, this part targets cost-sensitive embedded applications that need predictable RISC execution with minimal peripheral overhead. An 8-bit OTP microcontroller is a small, fixed-instruction CPU with on-chip non-volatile program memory that the end user programs once at production time. The PIC16C5x family is positioned in the broader hierarchy of: microcontroller -> 8-bit MCU -> RISC MCU -> PIC16 family -> PIC16C5x sub-family -> PIC16LC54A variant. OTP memory (One-Time Programmable, EPROM-based) is the predecessor to Flash memory and is characterized by bit-by-bit programmability and no in-circuit re-programmability, which historically made these parts attractive for high-volume, low-cost, read-mostly applications. Key features of the PIC16LC54A-04/P include: 12-bit wide instruction words with a symmetric instruction set delivering roughly 2:1 code compression versus typical 8-bit CISC competitors; a Harvard architecture with separate program and data buses; 33 single-word instructions, all single-cycle (4 oscillator clocks) except branches which take two cycles; an 8-bit real-time clock/counter (TMR0) with an 8-bit programmable prescaler; and seven or eight special-function hardware registers. The "04" suffix denotes 4 MHz maximum clock speed, and the "LC" prefix indicates the low-power CMOS variant versus the original PIC16C54. The "/P" package suffix denotes 18-pin PDIP (Plastic DIP). Architecturally, the PIC16LC54A-04/P uses a two-stage pipeline and a 2-level deep hardware stack, with direct, indirect, and relative addressing modes for both instructions and data. The watchdog timer is independent of the TMR0 prescaler, giving designers a clean separation between task timing and system recovery. The part supports power-on reset, brown-out detection via configuration bit, and an external MCLR reset, giving flexible bring-up options. Compared with the PIC16C54, the "A" revision added improved oscillator tolerance and wider supply voltage range. Typical applications include: simple logic-replacement glue logic (button debouncers, sequencers, PWM LED drivers), appliance controllers (washing-machine user-interface boards, microwave user panels, thermostat slave controllers), battery chargers (lead-acid float chargers with discrete FET control), remote-control transmitter encoders, security-system keypads, and educational microcontroller kits. The wide supply range and low cost make it a popular choice for designers migrating from discrete 4000-series CMOS logic to a programmable solution. When designing with the PIC16LC54A-04/P, note that OTP memory cannot be re-programmed in-circuit - firmware changes require a UV-erase windowed CERDIP variant (PIC16C54A-04/JW) or a new chip. For modern designs, consider migrating to a Flash-based PIC16F54, which is pin-compatible in the 18-pin PDIP footprint and provides in-circuit reprogramming. For new designs today, prefer PIC16F or PIC18 baseline parts for higher memory density, more peripherals, and modern development-tool support. This page synthesizes verified distributor pricing, parametric data, pin-compatible drop-in alternatives, and practical design notes that the manufacturer datasheet alone does not present in a single view.

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PIC16LC54A-04/SS

PIC16LC54A-04/SS - 8-bit 4MHz 768B OTP MCU SSOP-20 | Microchip

The Microchip PIC16LC54A-04/SS is an EPROM/ROM-based 8-bit CMOS microcontroller from the PIC16C5X family, delivering 4 MHz CPU clock speed with 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory in a 20-pin SSOP package. It provides 25 bytes of RAM, 12 digital I/O lines, and operates from a 3.0 V to 6.25 V supply, targeting cost-sensitive embedded control applications. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral I/O on one die. Within the broader hierarchy, the PIC16LC54A belongs to: microcontroller -> embedded controller -> semiconductor -> integrated circuit. The "LC" suffix indicates a low-power CMOS variant, the "54A" identifies the specific memory/peripheral subset, and the "/SS" suffix denotes the SSOP-20 surface-mount package. The PIC16C5X family pioneered Microchip's baseline 8-bit RISC architecture with a 12-bit instruction word and a 33-instruction set, providing deterministic execution for simple control loops. Key features include an RISC CPU core executing most instructions in a single 1 µs instruction cycle (at 4 MHz oscillator), a watchdog timer for reliable unattended operation, a programmable 8-bit prescaler shared with the watchdog, and power-saving SLEEP mode. The 12 I/O pins can source/sink up to 25 mA per pin and 100 mA total, suitable for direct LED or relay drive. The OTP program memory supports in-circuit programming via Microchip's ICSP interface, although traditional windowed CERDIP variants are also available for UV erasure. Typical applications include appliance controls, automotive sub-system modules, security and alarm panels, simple sensor signal conditioning, and battery-powered consumer products. The wide 3.0 V to 6.25 V supply range supports both 3.3 V and 5 V rails, while the low-power CMOS process enables low quiescent current draw in SLEEP mode for battery-backup designs. When designing with this device, consider migrating to the flash-based PIC16F54 drop-in for higher-volume production where field re-programmability is required. Ensure the MCLR pin is properly biased and that in-circuit serial programming (ICSP) header access is provided on the PCB for firmware upgrades during prototyping.

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PIC16LC54A-04E/P

PIC16LC54A-04E/P - 4MHz, 512B EPROM 8-bit MCU | Microchip

The Microchip Technology PIC16LC54A-04E/P is an EPROM-based 8-bit CMOS microcontroller in the PIC16C5x family, delivering 4 MHz maximum clock speed with a 12-bit wide instruction word and 8-bit data path in an 18-pin PDIP (CERDIP, windowed, 0.300 inch) through-hole package. According to the manufacturer datasheet, the device integrates 512 x 12 words of one-time-programmable EPROM program memory, 25 bytes of general-purpose RAM, 12 digital I/O lines, and an 8-bit real-time clock/counter (TMR0). Supply voltage spans 3.0 V to 6.25 V with the 'LC' low-voltage CMOS process variant. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data bus, optimized for embedded control tasks such as sensor reading, actuator driving, and simple state-machine logic. Within the semiconductor taxonomy, the PIC16LC54A belongs to the hierarchy: 8-bit microcontroller -> RISC microcontroller -> CMOS microcontroller -> embedded controller -> semiconductor. The PIC16C5x family uses a RISC-like instruction set with only 33 single-word/12-bit instructions, providing 2:1 code compression versus competing 8-bit MCUs in its class. Key features include a two-level deep hardware stack, direct/indirect/relative data and addressing modes, seven or eight special function hardware registers, internal power-on reset, watchdog timer with on-chip RC oscillator, and programmable code protection. Programmable options select oscillator type (RC, XT, LP, HS) and enable watchdog timer, power-on reset, and code protection bits in the EPROM configuration word. The PIC16LC54A architecture separates program and data buses (Harvard architecture), enabling simultaneous instruction fetch and data access. Seven Special Function Registers (PCL, STATUS, FSR, PCLATH, INDF, TMR0, OPTION, plus EEDATA on some variants) control I/O, timing, and program flow. The device supports in-circuit serial programming and is compatible with Microchip's PICSTART Plus and MPLAB development tools, reducing time-to-prototype for new designs. Typical applications include automotive body electronics, white goods and appliance controllers, low-end consumer products, and industrial control subsystems where small pin count, low power, and one-time-programmable memory are advantageous. The 'E' suffix denotes the extended automotive temperature grade (-40C to +125C) and 'P' denotes the PDIP package. When designing with this device, allocate a watchdog timer enable window and configure the oscillator selection fuse carefully to match the chosen resonator. Note that windowed CERDIP packages expose the EPROM die to UV light, allowing erasure for prototyping but requiring opaque labels in production. This page synthesizes current distributor pricing, verified drop-in alternatives, and practical design guidance not consolidated in the manufacturer datasheet.

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PIC16LC54A-04E/SS

PIC16LC54A-04E/SS - 8-bit 4MHz 768B OTP MCU | Microchip SSOP-20

The Microchip Technology PIC16LC54A-04E/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, operating at 4 MHz with 768 bytes of one-time programmable (OTP) program memory organized as 512 x 12 bits and 25 bytes of data RAM. It is housed in a 20-pin SSOP package with 12 digital I/O lines and runs from a 3.0 V to 6.25 V supply. The device uses RISC architecture with 12-bit-wide instructions and 8-bit-wide data path for high code density, achieving 2:1 code compression over comparable 8-bit microcontrollers. An 8-bit CMOS microcontroller is a single-chip computer that integrates CPU core, program memory, data RAM, and peripherals on one die. The PIC16LC54A belongs to the PIC16C5X family - the lowest-cost, OTP/EPROM-based branch of Microchip's PIC line - which sits within the broader taxonomy: 8-bit MCU -> microcontroller -> embedded controller -> semiconductor IC. The 'LC' suffix denotes a low-power CMOS variant, distinguishing it from the standard PIC16C54A, while the 'A' suffix denotes the improved silicon revision. This positioning makes the part a legacy workhorse for cost-sensitive embedded control. Key features include a two-level deep hardware stack, direct/indirect/relative addressing modes, an 8-bit real-time clock/counter (TMR0), power-on reset (POR), watchdog timer (WDT), and 12 bidirectional I/O pins capable of sourcing/sinking 25 mA. Seven or eight special-function hardware registers accelerate context save/restore. The fully static core allows clock frequencies from DC to 4 MHz with zero standby current. Architecturally, the device uses a Harvard architecture with separate program and data buses, enabling instruction fetch and operand read in a single cycle. The 12-bit instruction word encodes both opcode and literal operand, eliminating the need for a second instruction word and shrinking code footprint. An EPROM-based cell is used for the 512 x 12 program memory, programmed once via Microchip's development tools and irreversibly locked. Typical applications include appliance controllers, simple sensor interfaces, battery chargers, LED drivers, and white-goods human-machine interface (HMI) replacements for electromechanical timers. Designers favor the part for its low cost, predictable interrupt latency, and long-term Microchip toolchain support across MPLAB IDE, MPASMX assembler, and XC8 C compiler. A key design tip is to budget I/O pin current carefully: each pin can source/sink 25 mA but the VDD/VSS totals are limited, so multi-relay or LED-matrix loads require external driver transistors. Also, OTP memory cannot be erased - use the PIC16CR54A or PIC16F54 equivalents for flash-based prototyping during development. This page synthesizes distributor pricing, drop-in same-family alternatives, and practical SSOP-20 design notes not found in the manufacturer datasheet - giving engineers a single reference for sourcing and design.

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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

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

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

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

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

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

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

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

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

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

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

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