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PIC16C54T-RC/SO - 8-bit 4MHz OTP MCU, 768B | Microchip
PIC16C54T-RC/SO

PIC16C54T-RC/SO - 8-bit 4MHz OTP MCU, 768B | Microchip

The Microchip PIC16C54T-RC/SO is a member of the PIC16C5X family of low-cost, high-performance 8-bit fully-static EPROM/ROM-based CMOS microcontrollers, delivering 4 MHz CPU performance with 768 bytes of OTP program memory (organized as 512 x 12-bit words) and 25 bytes of general-purpose RAM in an 18-pin SOIC package. The 'T' suffix indicates Tape and Reel packaging, the 'RC' suffix denotes the oscillator type (external RC oscillator with up to 4 MHz CPU clock), and 'SO' designates the 18-lead Small Outline Integrated Circuit (SOIC-18) surface-mount package. Commercial temperature grade (0C to +70C) supports standard office and consumer environments. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and configurable I/O peripherals. Within the broader semiconductor taxonomy, microcontrollers sit under microprocessors and, more broadly, under digital ICs and integrated circuits. The PIC16C5X family, also known as the PIC16C5x baseline architecture, uses a RISC-style Harvard architecture with a fixed 12-bit instruction word, which yields approximately 2:1 code compression versus competing 8-bit CISC microcontrollers and simplifies firmware development. Key features include 12 I/O pins with individual direction control, an 8-bit timer/counter (TMR0) with an 8-bit programmable prescaler, a watchdog timer with its own on-chip RC oscillator for reliable resets, power-on reset, power-saving SLEEP mode, and a wide 2.5V to 6.25V operating voltage range. Code protection bit prevents unauthorized memory reads. The Harvard bus keeps program and data paths separate for predictable single-cycle instruction execution, except for program branches which take two cycles. Architecturally, the device uses a 12-bit program counter to address up to 2K x 12 of OTP/EPROM memory and 32 x 8 of file registers (special function plus general-purpose RAM). CMOS fabrication provides low power consumption - typical supply current is below 2 mA active and under 4 uA in SLEEP - enabling battery-friendly designs. Typical applications include low-cost consumer appliances, simple logic replacement, timer/counter subsystems, sensor front-ends, and remote control transmitters. The SOIC-18 footprint also makes it usable as a substitute for legacy 18-pin discrete logic circuits in maintenance and retrofits. Pair with a PICkit programmer and MPLAB X IDE for development. For reliable operation, place a 0.1 uF decoupling capacitor close to the VDD pin and choose the RC oscillator timing components (R, C) according to the datasheet frequency chart to keep CPU clock within tolerance. This page synthesizes distributor pricing, drop-in alternatives, and engineering design notes that go beyond the manufacturer datasheet by adding comparison context, selection guidance, and practical layout recommendations.

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PIC16C54T-RC/SS - 4MHz 8-Bit OTP MCU 768B | Microchip
PIC16C54T-RC/SS

PIC16C54T-RC/SS - 4MHz 8-Bit OTP MCU 768B | Microchip

The Microchip Technology PIC16C54T-RC/SS is an 8-bit, fully-static, EPROM/ROM-based CMOS microcontroller belonging to the PIC16C5x family, delivering 4 MHz CPU performance from 768 bytes (512 x 12) of one-time-programmable (OTP) program memory in a 20-pin SSOP (5.30 mm body width) tape-and-reel package. It operates from 3.0 V to 5.5 V across the commercial/industrial temperature range and is paired with 25 bytes of general-purpose RAM and 12 digital I/O lines. The "T" suffix denotes tape-and-reel packaging and "RC" specifies the 4 MHz resonator/RC-oscillator speed grade; "SS" indicates the 20-pin SSOP footprint. What is a PIC16C5x microcontroller? The PIC16C5x is Microchip's original low-cost, high-performance 8-bit RISC family, widely regarded as the ancestor of all modern PIC MCUs. It uses a Harvard architecture with separate program and data buses, a 12-bit-wide instruction word, and a fixed 33-instruction set. In the broader taxonomy, the PIC16C5x sits under: microcontroller -> embedded microcontroller -> 8-bit MCU -> RISC MCU -> EPROM/ROM-based MCU -> power management and control IC family. Key features include 33 single-word/single-cycle RISC instructions, 2:1 code compression versus competing 8-bit MCUs through 12-bit-wide instructions, Power-On Reset (POR), Watchdog Timer (WDT) with on-chip RC oscillator, and programmable code protection. The 12-bit instruction width yields compact code density uncommon in 8-bit parts, while the two-level deep hardware stack and 2 K x 12 program-memory address space support compact firmware designs. The PIC16C5x uses a RISC pipeline with single-cycle execution (except branches, which take two cycles), and integrates a precision 4 MHz internal RC-style oscillator reference. With a 4 MHz clock and 4 Tcy per instruction cycle, each instruction executes in 1 microsecond, delivering roughly 1 MIPS of throughput. The device's CMOS design provides low power consumption suitable for both battery and line-powered applications. Typical applications include appliance control, automotive body electronics, low-power remote sensors, security and access systems, and general-purpose embedded logic replacement. The wide 3.0 V to 5.5 V supply range and small SSOP-20 footprint make it well-suited for cost-sensitive, space-constrained designs. When designing with the PIC16C5x, ensure the OTP-programmed firmware is finalized before volume production - the "C" ROM family is one-time-programmable, so any firmware change requires a new part. Use the WDT for unattended recovery from software or hardware faults, and add 0.1 uF ceramic bypass capacitors near VDD/SS for stable operation. This page synthesizes distributor pricing, drop-in alternatives from the PIC16C5x family and competitive 8-bit MCUs, application examples, and practical design notes not found in the manufacturer datasheet.

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PIC16C54T-RCE/SO - 8-Bit OTP MCU, 4MHz, 18-SOIC | Microchip
PIC16C54T-RCE/SO

PIC16C54T-RCE/SO - 8-Bit OTP MCU, 4MHz, 18-SOIC | Microchip

The Microchip Technology PIC16C54T-RCE/SO is a member of the PIC16C5X family of low-cost, high-performance 8-bit fully-static EPROM/ROM-based CMOS microcontrollers, operating at up to 4 MHz (200 ns instruction cycle) in an 18-pin SOIC package supplied in Tape & Reel. The T-suffix indicates tape-and-reel packaging, /RCE denotes the extended (E) temperature grade, and /SO designates the 18-SOIC (7.50 mm) footprint. An 8-bit microcontroller (MCU) is a small single-chip computer that integrates a CPU, program memory, RAM, and peripheral I/O on a single die, executing instructions from on-chip program memory. Within the taxonomy, the PIC16C54 belongs to the hierarchy: microcontroller -> 8-bit MCU -> CMOS RISC MCU -> PIC16C5X family -> PIC16C54 sub-family, in the broader power management and embedded control semiconductor category. The /RCE ROMless/OTP one-time-programmable version is optimized for low-volume and prototype designs where field reprogrammability is not required. Key features include 768 bytes (512 x 12) of OTP program memory, 25 bytes of general-purpose RAM, 12 digital I/O pins, a 33-instruction RISC instruction set, a hardware Watchdog Timer (WDT), Power-On Reset (POR), and an external oscillator interface. Single-cycle instruction execution (except program branches) and 12-bit-wide opcodes produce 2:1 code compression versus competing 8-bit MCUs, an important density advantage for cost-sensitive applications. Supply voltage spans 3.25 V to 6 V, with the /E suffix extending the operating range to -40C to +125C. Typical applications include appliance control, automotive body electronics, smart sensors, low-end remote controls, battery chargers, and simple LED driver controllers. The 18-SOIC footprint also supports hand-soldering in prototypes and small-series industrial systems. The RISC architecture enables deterministic interrupt response and predictable timing for hard-real-time loops, while the small code footprint allows the 512-word OTP window to absorb full application logic in many designs. When designing with the PIC16C54T-RCE/SO, observe the 6 V absolute-maximum VDD rating, provide a 0.1 uF decoupling capacitor close to VDD, and select an external clock source that meets the 4 MHz specification. Because OTP memory cannot be re-programmed, the JW (windowed) variant is recommended for firmware development and the C-revision mask set is recommended for production.

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PIC16C54T-RCE/SS - 8-Bit OTP MCU, 4MHz, 768B ROM | Microchip
PIC16C54T-RCE/SS

PIC16C54T-RCE/SS - 8-Bit OTP MCU, 4MHz, 768B ROM | Microchip

The Microchip PIC16C54T-RCE/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, delivering up to 4 MHz instruction execution in a compact 20-pin SSOP package. According to Microchip datasheet DS30189S, the device integrates 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory and 25 bytes of general-purpose RAM, with 12 digital I/O pins arranged on two ports (PORTA 4-bit, PORTB 8-bit). The 'T' suffix denotes tape-and-reel packaging; 'RC' identifies the 4 MHz RC-oscillator speed grade; 'E' marks the extended industrial temperature range (-40C to +125C). 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. The PIC16C5X family sits inside the broader taxonomy: microcontroller → embedded processor → semiconductor IC. These legacy RISC MCUs use a Harvard architecture with separate program and data buses, a 12-bit instruction word, and only 33 single-word instructions - making them among the simplest to program of any 8-bit MCU. OTP memory is field-programmable but not erasable, targeting cost-sensitive volume production where firmware is final. Key features include a 200 ns single-cycle instruction execution (4 MHz), a 33-instruction RISC instruction set, a programmable watchdog timer with on-chip RC oscillator, an 8-bit real-time clock/counter with 8-bit prescaler, and power-on reset. The PORTA pins are multiplexed with the device's analog comparator reference and RTCC, while PORTB provides eight bidirectional digital I/O lines with programmable weak pull-ups. The device operates from 3.25 V to 6.0 V and is well suited to battery-powered and 5 V regulated designs. The PIC16C54 implements a RISC pipeline that fetches and executes each instruction in a single clock cycle (except branches, which take two). This two-stage pipeline is what gives the family its deterministic 200 ns instruction cycle at 4 MHz. The internal architecture separates EPROM program memory (12-bit wide) from RAM data memory (8-bit wide), allowing simultaneous instruction fetch and data access. The result is a low-MIPS-per-mW footprint that suits small, latency-sensitive control loops. Typical applications include low-cost consumer appliances, remote-control transmitters, sensor signal conditioning, small motor and solenoid drivers, and general-purpose logic replacement where a state-machine or delay timing function replaces discrete 74HC logic. Industrial uses include HVAC damper control, lighting ballast timing, and simple panel-meter drivers where only a handful of I/O lines are needed. When designing with the PIC16C54, observe that OTP memory cannot be re-programmed in-circuit, so plan to use the JW ceramic-windowed version for prototype code iteration and migrate to OTP or mask-ROM (CR suffix) for production. The SSOP-20 package's thermal resistance allows operation up to +125 C ambient, but consider the 5 V/4 MHz performance envelope when porting firmware from newer PIC16F1xxx parts. This page synthesizes distributor pricing, drop-in OTP PIC16C5X alternatives, and practical design notes that go beyond the manufacturer datasheet. The PIC16C54T-RCE/SS belongs to a long-running family with abundant code examples and reference designs in Microchip application notes AN545, AN556, and the Embedded Control Handbook.

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PIC16C54T-RCI/SO - 8-bit OTP MCU, 768B ROM, 25B RAM, SOIC-18 | Microchip
PIC16C54T-RCI/SO

PIC16C54T-RCI/SO - 8-bit OTP MCU, 768B ROM, 25B RAM, SOIC-18 | Microchip

The Microchip Technology PIC16C54T-RCI/SO is a member of the PIC16C5X family of EPROM/ROM-based 8-bit CMOS microcontrollers, packaged in an 18-pin SOIC (SO) wide-body surface-mount package. It integrates 768 bytes of One-Time-Programmable (OTP) program memory, 25 bytes of data RAM, and 12 configurable I/O pins, all driven by a RISC instruction set of only 33 single-word instructions. The "RC" oscillator suffix designates an external resistor/capacitor oscillator mode, while "I" denotes the industrial operating temperature range of -40C to +85C, and the "T" suffix indicates tape-and-reel packaging. What is a PIC16C5X microcontroller? It is one of the earliest generations of Microchip's PIC microcontrollers, originally introduced in the late 1980s and still in production for legacy and cost-sensitive embedded designs. PIC microcontrollers occupy the broader category hierarchy of microcontroller -> embedded controller -> semiconductor device. They use a Harvard architecture, separate program and data buses, and a RISC instruction set that allows most instructions to execute in a single 200 ns instruction cycle at a 20 MHz clock input. Key features of the PIC16C54T-RCI/SO include a 200 ns instruction cycle, single-cycle arithmetic and logic instructions (only program branches take two cycles), a 4.5 V to 5.5 V single-supply operating range, and a maximum clock input of 20 MHz. The device includes a programmable watchdog timer, a power-on reset (POR), and a 12-bit-wide instruction word that achieves approximately 2:1 code compression over competing 8-bit architectures of the era. The 12 I/O pins are bidirectional and individually programmable for direction, weak pull-up, and wake-on-change. Architecturally, the PIC16C54 uses a 12-bit program counter and a separate 5-bit register file selector. The RC oscillator mode allows the system clock to be generated by an external resistor and capacitor, trading frequency accuracy for the lowest possible bill-of-materials cost - the part can run with no external resonator or crystal. The OTP EPROM program memory is programmed once and is non-erasable, making this part suitable for volume production where firmware is final. Typical applications include low-cost appliance controllers, simple sensor interfaces, RC servo controllers, dedicated peripheral controllers, and replacement of discrete logic in legacy equipment. The wide-body SOIC-18 footprint is also popular for breadboard-friendly prototype adapters and educational kits. The industrial temperature rating allows deployment in outdoor enclosures and uncontrolled industrial environments. When designing with this device, note that OTP memory cannot be re-programmed in-circuit, so code must be fully validated before committing to production units. For development and code iteration, use the windowed CERDIP PIC16C54-JW part or the flash-based PIC16F54 successor. Estimated: at 20 MHz and 5 V, typical DC current consumption is approximately 2 mA during active execution and a few microamps in sleep mode. This page synthesizes distributor pricing, drop-in same-package alternatives from Microchip's PIC16C5X family, and practical design considerations not found in the standalone manufacturer datasheet.

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PIC16C54T-RCI/SS - 8-Bit 4MHz OTP MCU, 768B | Microchip | 20-SSOP
PIC16C54T-RCI/SS

PIC16C54T-RCI/SS - 8-Bit 4MHz OTP MCU, 768B | Microchip | 20-SSOP

The Microchip Technology PIC16C54T-RCI/SS is a cost-optimized 8-bit CMOS microcontroller from the PIC16C5X family, integrating 768 bytes of One-Time-Programmable (OTP) program memory, 32 bytes of RAM, and 12 general-purpose I/O pins in a 20-pin SSOP (Shrink Small Outline Package) supplied on tape and reel. It executes 33 single-word instructions at a 200 ns instruction cycle (4 MHz oscillator input, 20 MHz max), with single-cycle execution for all instructions except program branches which are two-cycle, and operates from a 3.0 V to 6.25 V supply. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (ROM/EPROM/Flash/OTP), volatile data memory (RAM), and programmable I/O peripherals on one die. The PIC16C5X family belongs to the larger 8-bit microcontroller class, sits within the broader category of embedded microcontrollers, and falls under the umbrella of embedded processing semiconductors. Compared with 16-bit and 32-bit MCUs, 8-bit PIC devices remain attractive for cost-sensitive, deterministic, low-power control loops where peripheral complexity is modest. Key features of the PIC16C54T-RCI/SS include a RISC Harvard-architecture core with 12-bit wide instructions and 2:1 code compression versus typical 8-bit CISC competitors, a 25-entry hardware stack, a watchdog timer with its own on-chip RC oscillator, an 8-bit real-time clock/counter (RTCC) with programmable prescaler, and power-on reset plus brown-out protection. The /RC oscillator suffix indicates an external resistor/capacitor oscillator configuration, while the 'I' indicates the industrial -40C to +85C operating range. The 'T' suffix indicates tape-and-reel packaging; the '/SS' suffix specifies the 20-pin SSOP (5.30 mm body width). Architecture-wise, the PIC16C5X uses a fully static CMOS design with separate program and data buses (Harvard), allowing simultaneous instruction fetch and data access. The 12-bit instruction word plus 2:1 code compression means most instructions fit in a single 12-bit program word, yielding code density that typically exceeds CISC 8-bit alternatives. Typical applications include low-cost appliance controllers, simple sensor interfaces, LED lighting controllers, battery chargers, and replacement of discrete logic in white-goods and consumer devices. Designers choose the PIC16C54 for applications where price per unit, deterministic interrupt-free operation, and minimum external component count matter more than raw MIPS. When designing with the PIC16C54T-RCI/SS, ensure the RC oscillator R/C values stay within the datasheet's stability envelope (typically R = 3 kOhm to 100 kOhm, C > 20 pF). Add a 0.1 uF decoupling capacitor close to VDD and bulk-cap the supply rail if the load is highly dynamic. Programming must use Microchip's device programmer (e.g., PICSTART Plus or MPLAB PM3) before the OTP window closes - the part is not field-reprogrammable. This page synthesizes current distributor pricing, drop-in compatible alternatives, and practical design notes that complement the manufacturer datasheet, helping engineers evaluate sourcing options for the legacy PIC16C5X family.

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PIC16C54T-XT/SS - 8-bit OTP MCU, 4MHz, 768B, SSOP-20 | Microchip
PIC16C54T-XT/SS

PIC16C54T-XT/SS - 8-bit OTP MCU, 4MHz, 768B, SSOP-20 | Microchip

The Microchip Technology PIC16C54T-XT/SS is an 8-bit EPROM/ROM-based CMOS microcontroller in the PIC16C5X family, supplied in a 20-pin SSOP package (0.209", 5.30 mm width). It delivers up to 4 MHz CPU clock with a 200 ns single-cycle instruction time, 768 bytes (512 x 12) of one-time-programmable (OTP) program memory, 25 bytes of RAM, and 12 digital I/O pins. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, program memory, and I/O peripherals in one package, designed for embedded control tasks. Within the semiconductor taxonomy, the PIC16C54T-XT/SS belongs to the hierarchy: microcontroller -> embedded processor -> digital IC -> semiconductor. The PIC16C5X family uses a 12-bit-wide instruction set with RISC architecture, achieving roughly 2:1 code compression over comparable 8-bit CISC MCUs, and it executes single-cycle instructions (200 ns at 20 MHz) with only two-cycle branches. Key differentiating specifications include the 33 single-word instruction set, 12 bidirectional I/O pins, an operating voltage range of 4.5 V to 5.5 V (some sources cite 3.3 V/5 V dual supply tolerance), and tape-and-reel packaging with 1,600-piece standard quantity. The device integrates power-on reset, watchdog timer, and a programmable code-protect bit, eliminating many external components. Typical applications include low-cost consumer appliance controllers, simple sensor interfaces, LED display drivers, hobby and education platforms, and legacy industrial control retrofits. The compact SSOP-20 footprint suits space-constrained PCB designs where the OTP memory model supports volume production without mask-ROM tooling costs. When designing with this part, note that the PIC16C5X core lacks interrupts, so polling is required. Engineers should validate the OTP programming procedure (high-voltage VPP) and use the Microchip MPLAB IDE for code development.

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PIC16C54T-XTE/SO - 8-Bit OTP MCU, 4MHz, 768B | Microchip
PIC16C54T-XTE/SO

PIC16C54T-XTE/SO - 8-Bit OTP MCU, 4MHz, 768B | Microchip

The Microchip PIC16C54T-XTE/SO is an 8-bit RISC microcontroller in the PIC16C5x family, supplied in an 18-pin SOIC wide-body package on tape and reel. It integrates 768 bytes of one-time programmable (OTP) EPROM organized as 512 words x 12 bits, 25 bytes of general-purpose RAM, and a fully static CMOS core that operates from DC up to 4 MHz. According to the Microchip product page, this device is rated for 3.3 V / 5 V operation and uses 12-bit wide instructions for 2:1 code compression versus typical 8-bit competitors, reducing overall program size for cost-sensitive embedded designs. An 8-bit microcontroller is a small single-chip computer built around a CPU, program memory, data RAM, and I/O peripherals. The PIC16C5x family belongs to the broader hierarchy: microcontroller -> MCU -> embedded processor -> semiconductor. These OTP CMOS MCUs target high-volume applications where mask-ROM cost savings are not warranted and field programmability is required. The PIC16C5x architecture uses a Harvard structure with separate program and data buses, an accumulator-based ALU, and a small two-level hardware stack, which simplifies interrupts and reduces die area compared with register-based CISC 8-bit cores. Key features of the PIC16C54T-XTE/SO include a 33-instruction set, hardware multiplier-free architecture, 12 I/O pins with individual direction control, a programmable watchdog timer with its own on-chip RC oscillator, and a power-on reset circuit. The device supports sleep mode for low-power standby and has an operating temperature range typical of industrial-grade silicon. Power consumption in active mode is on the order of a few milliamperes at 5 V/4 MHz, with standby current dropping into the microampere range when sleep is engaged. Typical applications include simple logic replacement, RC timers, sensor front-end conditioning, low-end consumer appliances, and industrial control subsystems where deterministic instruction timing and a small footprint matter more than raw throughput. The wide-body 18-SOIC (0.295 inch / 7.50 mm) gives easier hand-soldering and inspection than narrow-body SO packages, while the -XTE speed designation corresponds to the 4 MHz oscillator grade with the industrial operating range. When designing with this part, allocate sufficient decoupling on VDD/VSS, keep crystal traces short, and respect the device's low drive-strength I/O limits; for designs that require re-programmability or in-circuit debugging, consider migrating to a flash-based PIC16F equivalent in the same footprint.

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PIC16C54T-XTI/SO - 8-bit 4MHz OTP MCU, 512B EPROM | Microchip
PIC16C54T-XTI/SO

PIC16C54T-XTI/SO - 8-bit 4MHz OTP MCU, 512B EPROM | Microchip

The Microchip Technology PIC16C54T-XTI/SO is an 8-bit RISC CMOS microcontroller in the PIC16C5x family, featuring 512 words (768 bytes) of one-time-programmable (OTP) EPROM program memory and 25 bytes of data RAM, housed in an 18-pin SOIC (0.295 inch / 7.50 mm body width) package supplied on Tape & Reel. The 'XT' speed grade specifies a 4 MHz maximum oscillator input, while the 'I' suffix denotes the industrial -40C to +85C operating temperature range, and the '/SO' suffix indicates the SOIC-18 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 piece of silicon. The PIC16C5x family is one of the original Microchip baseline architectures, implementing a Harvard RISC core with 12-bit-wide instructions that yield approximately 2:1 code compression over competitive 8-bit CISC devices of its class. PIC16C54 sits at the entry of the PIC taxonomy: PIC16C54 -> PIC16C5x family -> PIC baseline -> 8-bit PIC -> Microcontroller -> Semiconductor. Its simple, deterministic instruction set enables compact code development and predictable real-time interrupt response. Key features include a 4 MHz oscillator input (XT grade), 33 single-word instructions, a 12-bit instruction word, two 8-bit I/O ports (Port A and Port B, total 12 I/O pins), an 8-bit real-time clock/counter with 8-bit programmable prescaler, power-on reset, watchdog timer with on-chip RC oscillator, and code-protection EPROM. The CMOS process keeps active supply current low while supporting 3.0V to 6.25V operation (industrial variants typically 3.0V-6.25V) and offers a power-saving SLEEP mode that wakes on pin change or watchdog timeout. The PIC16C54 architecture uses a single accumulator (W register) and a two-level hardware stack, characteristic of baseline PIC devices. The Harvard memory map separates program EPROM (512 x 12) from data RAM (25 x 8) and the 7-bit file register space. The wide 12-bit instruction word allows most instructions to execute in a single instruction cycle (4 oscillator clocks), giving an effective 1 MIPS throughput at 4 MHz - adequate for logic replacement, simple sequencer, and glue-logic consolidation duties. Typical applications include logic replacement in appliance controls, RC servo and PWM generator firmware, simple sensor interface front-ends (with external ADC), automotive interior trim controls, security keypads, low-end consumer devices, and industrial timer/counter modules. The industrial -40C to +85C range plus wide 3.0V-6.25V supply tolerance makes it robust for 5V industrial environments. The OTP EPROM is suitable for low-to-medium volume production where the final firmware is fixed before release. When designing with the PIC16C54T-XTI/SO, use the Microchip MPASM assembler and MPLAB SIM/MPLAB X IDE for code development, and the MPLAB PM3 universal programmer for OTP device programming. The XT oscillator mode requires a 4 MHz crystal or ceramic resonator with the appropriate load capacitors per the datasheet. For new designs, consider migrating to the flash-based PIC16F54 in the same 18-pin SOIC footprint, which offers identical peripherals and in-circuit programmability. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that are not consolidated on a single manufacturer page.

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PIC16C55-10/P - 8-bit OTP MCU, 10MHz, 20 I/O, PDIP-28 | Microchip
PIC16C55-10/P

PIC16C55-10/P - 8-bit OTP MCU, 10MHz, 20 I/O, PDIP-28 | Microchip

The Microchip Technology PIC16C55-10/P is an 8-bit CMOS microcontroller from the PIC16C5x family, featuring a 12-bit wide instruction set, an 8-bit wide data path, and a maximum clock speed of 10 MHz in a 28-pin PDIP through-hole package. The device integrates 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory, 24 bytes of RAM, and 20 digital I/O pins organized across multiple ports, providing ample general-purpose digital I/O for legacy embedded control applications. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, working RAM, and peripheral interfaces. Within the semiconductor taxonomy, a microcontroller is a sub-category of integrated circuits (ICs), and the PIC16C5x sits in the OTP-programmable low-end 8-bit segment. The PIC16C5x architecture uses a Harvard layout with separate program and data buses, a two-level deep hardware stack, and direct/indirect/relative addressing modes, enabling compact code density and deterministic interrupt response for simple control loops. Key features include 12-bit wide instructions, 8-bit data path, seven or eight special-function hardware registers, a two-level hardware stack, a single 8-bit real-time clock/counter (TMR0), and an operating supply range of 4.5 V to 5.5 V. The 10 MHz oscillator speed grade and 4.5 V to 5.5 V VDD range target 5 V industrial and consumer designs that predate the modern 3.3 V MCU ecosystem. The 20 I/O pins are TTL/CMOS-compatible and can source/sink typical CMOS drive currents, making the part drop-in compatible with classic PIC16C5x layouts. The PIC16C55-10/P uses a classic RISC-like instruction set of approximately 33 single-word/cycle instructions, with most instructions executing in one instruction cycle (4 clock periods). The architecture prioritizes deterministic execution, low cost, and ease of programming through EPROM/OTP, which made it a workhorse in the 1990s for appliances, automotive subsystems, and industrial timers. Compared with later PIC16F parts, this OTP variant is one-time-programmable and cannot be electrically erased, which is an important design consideration for prototype flows. Typical applications include legacy industrial control boards, simple timer/counter subsystems, LED display drivers, appliance control boards, low-end security keypads, and drop-in replacements for 27-series EPROM microcontrollers in long-life OEM products. The 28-pin PDIP footprint is also convenient for breadboard prototyping, university teaching labs, and hobbyist retrocomputing projects that target the original PIC16C5x instruction set. When designing with this device, plan the OTP programming workflow early because the part cannot be re-programmed: use a PIC16C5x-compatible programmer such as the MPLAB PM3, and order pre-programmed parts through Microchip's programming service for production. Ensure VDD stays within 4.5 V to 5.5 V and that the 20 I/O pins are not loaded beyond their source/sink ratings; add a 0.1 uF decoupling cap close to the VDD pin. This page synthesizes distributor pricing, drop-in PIC16C5x family alternatives, and practical OTP-programming design notes not found in the manufacturer datasheet, helping engineers source, replace, and integrate the PIC16C55-10/P with confidence.

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PIC16C55-10/SO - 8-bit OTP MCU, 768B, 20 I/O, 10MHz SOIC-28 | Microchip
PIC16C55-10/SO

PIC16C55-10/SO - 8-bit OTP MCU, 768B, 20 I/O, 10MHz SOIC-28 | Microchip

The Microchip PIC16C55-10/SO is an 8-bit CMOS RISC microcontroller built around the PIC16C5x baseline architecture, offering 768 bytes of one-time-programmable (OTP) program memory, 24 bytes of RAM, and 20 digital I/O pins in a 28-pin SOIC wide-body (SO) package. The "-10" speed grade specifies a 10 MHz maximum oscillator input, and the part is specified for operation from 4.5 V to 5.5 V across the commercial temperature grade. It executes 33 single-word, single-cycle (200 ns at 10 MHz) instructions from a 12-bit-wide instruction word, achieving the 2:1 code compression Microchip markets for the PIC16C5x family. What is a PIC16C5x baseline MCU? The PIC16C5x family is Microchip's original baseline 8-bit microcontroller line, sitting below the mid-range PIC16 and enhanced PIC17/PIC18 in capability. Baseline MCUs use a 12-bit instruction word, a two-level hardware stack, and seven or eight special function registers. They are intended for low-cost, deterministic bit-IO and timing applications where advanced peripherals such as ADC, UART, or PWM are not required. PIC16C5x parts fall under the broader taxonomy: microcontroller -> 8-bit MCU -> embedded controller -> semiconductor. Key features of the PIC16C55-10/SO include a real-time clock/counter (TMR0) with an 8-bit prescaler, direct/indirect/relative addressing modes for both operands, a two-level deep hardware call stack, and a watchdog timer (WDT) with its own on-chip RC oscillator for recovery without external intervention. The device supports internal or external oscillator modes and offers low-power SLEEP mode with wake-up on pin change or watchdog timeout. Architecturally, the PIC16C55-10 uses a Harvard architecture with separate program and data buses, allowing instruction fetch and operand access in a single clock cycle. The OTP program memory is written using a production programmer such as the MPLAB PM3; once programmed, the code is non-volatile but not erasable, making the PIC16C55 family well suited to mature production designs where code stability has been validated. The 20 I/O pins are bidirectional and individually configurable for input or output. Typical applications for the PIC16C55-10/SO include small appliance controllers, HVAC damper and fan controls, LED chasers and decorative lighting sequencers, simple sensor readers with digital outputs, automotive body-electronics nodes, and any cost-sensitive embedded design that needs deterministic IO without an RTOS. The wide-body SOIC-28 footprint simplifies hand-soldering and rework on prototype boards compared to smaller QFN packages. A key design consideration is OTP-only program memory: firmware must be 100% verified before programming. Consider migrating to the flash-based PIC16F57 (pin-compatible in most pad-outs) if your design still needs in-field firmware updates. Use MPLAB XC8 with the baseline compiler setting for code generation. This page synthesizes real distributor pricing, parametric cross-references to PIC16C5x family pin-compatible variants, and practical design notes not consolidated on a single manufacturer page.

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PIC16C55-10/SP - 768B OTP 8-bit MCU 10MHz SPDIP-28 | Microchip
PIC16C55-10/SP

PIC16C55-10/SP - 768B OTP 8-bit MCU 10MHz SPDIP-28 | Microchip

The Microchip Technology PIC16C55-10/SP is an 8-bit CMOS RISC microcontroller from the PIC16C5X baseline family, delivering 768 bytes of One-Time-Programmable (OTP) program memory and 24 bytes of data RAM in a 28-pin SPDIP (Skinny Plastic DIP) through-hole package. It operates up to a 10 MHz clock rate from a 4.5V to 5.5V supply, providing 12 bidirectional I/O lines organized into three ports (PORTB, PORTC, and a partial PORTA-like configuration), one 8-bit timer/counter, and a watchdog timer for reliable embedded control. A baseline PIC microcontroller is a reduced-instruction-set (RISC) 8-bit MCU based on Harvard architecture, meaning program and data buses are physically separated. This family is the simplest in the PIC16C lineage, designed for cost-sensitive, low-pin-count embedded tasks. The PIC16C55 belongs to the hierarchy: PIC16C5X baseline -> PIC16 family -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. Within an embedded system hierarchy, the baseline MCU sits beneath 16-bit and 32-bit MCUs but above simple logic ICs and timers. Key specifications include 768 bytes of OTP program memory (not rewritable; for prototyping the windowed CERDIP/JW variant is used), 24 bytes of static RAM, 12 I/O pins, a single 8-bit Timer0 module, on-chip watchdog timer with internal RC oscillator, 4.5V to 5.5V VDD range, and a maximum clock frequency of 10 MHz. The OTP memory allows pre-production volume manufacturing, while the JW windowed package supports erasure via UV exposure during development. Architecturally, the PIC16C55-10 uses a 12-bit instruction word with 33 single-word instructions and a two-stage pipeline, executing one instruction per instruction cycle (four oscillator clocks). All instructions are single-cycle except program branches, which are two-cycle. The device's RISC design delivers deterministic interrupt response and predictable timing - important for low-cost motor control, simple sensor interfaces, and discrete-logic replacement. Typical applications include appliance controls (washing machines, microwave ovens, rice cookers), battery chargers, simple motor control, LED drivers, power-tool electronics, remote controls, security sensor interfaces, and consumer toys. The -10 speed grade denotes 10 MHz maximum oscillator frequency and 400 ns instruction cycle, suitable for applications where cost is the primary driver and computational throughput is modest. When designing with the PIC16C55-10/SP, ensure a 0.1 uF decoupling capacitor is placed within 1 cm of the VDD pin and that the MCLR reset pin is pulled high through a 10 kohm resistor. The OTP memory is one-time programmable only, so consider PIC16C55/JW windowed or PIC16F54 flash equivalents for prototyping. Brown-out reset is not present on the PIC16C55; an external voltage supervisor is recommended for industrial environments. This page synthesizes distributor pricing as of 2026-09-16, drop-in same-package alternatives sourced from Microchip's official cross-reference data, parametric comparison tables, and practical design notes not collected in a single location in the manufacturer datasheet.

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PIC16C55-10E/P - 8-bit OTP MCU 10MHz 768B | 28-PDIP | Microchip
PIC16C55-10E/P

PIC16C55-10E/P - 8-bit OTP MCU 10MHz 768B | 28-PDIP | Microchip

The Microchip Technology PIC16C55-10E/P is an 8-bit CMOS OTP (One-Time-Programmable) microcontroller from the PIC16C5X family, delivering 10 MHz CPU performance with 768 bytes (512 x 12) of program memory and 24 bytes of RAM in a 28-pin PDIP (0.600") through-hole package. Headline specifications include a 4.5 V to 5.5 V single-supply operating range, 20 digital I/O pins, an extended -40 °C to +125 °C temperature grade, and an integrated watchdog timer for unattended operation. An 8-bit OTP microcontroller is a compact single-chip computer with non-volatile one-time-programmable program memory, a small RAM, and a CPU plus peripherals on one die. The PIC16C55 belongs to the broader product hierarchy: PIC16C5X -> PIC16C family -> PICmicro 8-bit microcontroller -> microcontroller -> embedded processor -> semiconductor. Engineers select OTP parts like the PIC16C55 for low-cost, fixed-function consumer and industrial products where firmware is final at production time and field reprogramming is not required. Key differentiating features include the 12-bit-wide instruction word providing roughly 2:1 code compression versus other 8-bit MCUs in its class, a low-power CMOS architecture with sleep current in the microamp range, and a Harvard bus structure separating program and data memory for deterministic execution. The 20 I/O pins each source or sink up to 25 mA, allowing direct LED and small-solenoid drive without external transistors. The integrated watchdog timer and power-on reset reduce external component count for brown, low-cost designs. Typical application domains include appliance control, security keypads, remote-control transmitters, simple sensor interfaces, hobby electronics, and low-end industrial controllers. The wide -40 °C to +125 °C extended grade suits automotive under-hood and outdoor industrial enclosures. The 28-PDIP package is favored for hand-soldered prototypes, educational kits, and low-volume production where socketed replacement simplifies field service. When designing with the PIC16C55-10E/P, plan a stable 5 V rail with adequate bulk decoupling, reserve the MCLR pin for a proper reset network, and ensure the high-current I/O pins do not exceed the package's total current budget. The OTP memory requires programming prior to final assembly since it cannot be erased or rewritten.

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PIC16C55-10E/SS - 8-Bit 10MHz OTP MCU 768B | Microchip
PIC16C55-10E/SS

PIC16C55-10E/SS - 8-Bit 10MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C55-10E/SS is an 8-bit RISC microcontroller from the PIC16C5x family, operating at 10MHz with 768 bytes of One-Time Programmable (OTP) program memory (organized as 512 words x 12 bits) and 25 bytes of data RAM, packaged in a 28-pin SSOP (Shrink Small Outline Package). A microcontroller (MCU) is a single-chip computer containing a processor core, program memory, data RAM, and integrated peripherals. PIC microcontrollers use a Harvard architecture with separate program and data buses, an accumulator-based RISC core, and 12-bit wide instructions that deliver roughly 2:1 code compression versus competing 8-bit MCUs in the same price class. The PIC16C5x family sits at the entry level of the PIC16 line, optimized for low-cost, high-volume embedded control tasks where deterministic instruction timing and OTP simplicity outweigh the need for in-system reprogrammability. Key features include a 33-instruction set, 2-level hardware stack, 12-bit instruction word, 8-bit data path, internal watchdog timer, and 20 I/O pins capable of sourcing/sinking up to 25mA per pin for direct LED drive. The wide instruction set simplifies compiler output and hand-coded assembly, while the OTP memory is factory- or field-programmable exactly once, suiting mature designs where firmware is finalized. The device operates from 2.5V to 6.0V across -40C to +125C industrial temperature range, marked by the -10E speed/temperature suffix. Architecturally, the PIC16C55 employs a 2-stage pipeline that fetches the next instruction while executing the current one, enabling most instructions to complete in a single 100ns instruction cycle at 10MHz. The OTP program memory uses EPROM cells that retain data for decades and are erasable only by UV exposure, requiring a windowed package for development iterations - the SSOP -10E/SS variant is intended for production where code is finalized. Typical applications include appliance control (washing machines, microwave ovens, rice cookers), remote controls, toy electronics, simple sensor interfaces, LED driving and chase patterns, low-end motor control via PWM, and consumer white goods where unit cost dominates BOM. The wide operating voltage and industrial temperature grade also support automotive body electronics and industrial sensor hubs. Designers should ensure the OTP memory is programmed before final PCB assembly since field updates are impossible without windowed packages. The 25-byte RAM limits data structures - complex state machines should offload variables to EEPROM external to the MCU. In-system debugging requires emulation tools since the OTP device cannot be re-flashed.

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PIC16C55-10I/P - 10MHz 8-Bit OTP MCU 768B 28-DIP | Microchip
PIC16C55-10I/P

PIC16C55-10I/P - 10MHz 8-Bit OTP MCU 768B 28-DIP | Microchip

The Microchip Technology PIC16C55-10I/P is an EPROM/ROM-based 8-bit CMOS microcontroller from the PIC16C5X family delivering 10 MIPS performance in a 28-pin PDIP (DIP-28) through-hole package. It features 768 bytes of OTP program memory, 24 bytes of RAM, and 20 digital I/O pins operating from a 4.0V to 6.0V supply at industrial temperature range -40C to +85C. What is an OTP microcontroller? An OTP (One-Time Programmable) microcontroller is a class of MCU that uses EPROM-based non-volatile memory allowing the device to be programmed a single time using a device programmer. Unlike flash-based MCUs, OTP parts cannot be reprogrammed in-circuit and are typically chosen for cost-sensitive, high-volume production where firmware is finalized before manufacture. The PIC16C5X family uses a 12-bit wide RISC instruction set with Harvard architecture, delivering 2:1 code compression versus competing 8-bit CISC architectures in its class. Key features include a 10 MHz maximum clock input, 33 single-word instructions, 2-level hardware stack, 8-bit timer/counter with 8-bit programmable prescaler, and power-on reset. The device integrates a watchdog timer, brown-out detection, and 20 mA sink/source capability per I/O pin. Power consumption is approximately 2 mA typical at 5V/4 MHz, making the PIC16C55-10I/P suitable for mains-powered industrial controls rather than battery applications. Architecturally, the PIC16C55-10I/P uses a RISC Harvard design with separate program and data buses, enabling simultaneous instruction fetch and data access. The 12-bit instruction word provides direct, immediate, and relative addressing modes plus bit manipulation. The OTP program memory is windowless (one-time-only) which reduces per-unit cost versus ceramic-windowed UV-erasable variants. The -10 speed grade denotes a 10 MHz maximum oscillator frequency. Typical applications include appliance controls, automotive body electronics, industrial sensor interfaces, and remote sensor transmitters where mature, low-cost 8-bit control is sufficient. The wide 4-6V operating range and industrial temperature rating also suit 5V industrial busses and automotive underhood environments in sealed modules. When designing with this part, verify that your firmware volume fits within the 768-byte OTP memory budget and that you are using the PIC16C5X baseline instruction set - code written for PIC16F or PIC18 cores is not portable without rewriting. Programming requires a Microchip MPLAB PM3 or compatible device programmer; this part cannot be programmed in-circuit. This page synthesizes distributor pricing, parametric comparison with same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet. Pricing reflects real-time distributor data and includes explicit cross-brand pin-compatibility guidance for obsolete or hard-to-source PIC16C5X inventory.

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PIC16C55-10I/SO - 8-bit CMOS MCU, 768B OTP, 28-SOIC | Microchip
PIC16C55-10I/SO

PIC16C55-10I/SO - 8-bit CMOS MCU, 768B OTP, 28-SOIC | Microchip

The Microchip Technology PIC16C55-10I/SO is a member of the PIC16C5X family of low-cost, high-performance 8-bit fully-static EPROM/OTP-based CMOS microcontrollers. It integrates 768 bytes of EPROM/OTP program memory (organized as 512 x 12), 25 bytes of RAM, and a 12-bit instruction word with an 8-bit data path in a 28-pin SOIC package. The device operates from a 4.5V to 5.5V single supply, runs at up to 10 MHz (the "-10" speed grade), and exposes 20 digital I/O lines across ports RA, RB, and RC. An 8-bit CMOS microcontroller (often abbreviated 8-bit MCU) is a single-chip computer built around an 8-bit data path, integrating a CPU core, non-volatile program memory (ROM/EPROM/Flash/OTP), volatile data memory (RAM), and programmable peripherals. Within the broader semiconductor taxonomy, an MCU sits under microcontroller -> embedded processor -> digital IC -> semiconductor. The PIC16C5X architecture uses a Harvard design with separate program and data buses, a 12-bit-wide instruction word enabling high code density, and a two-level hardware stack - characteristics that made the PIC family a workhorse for cost-sensitive 8-bit designs in the 1990s and early 2000s. Key features of the PIC16C55-10I/SO include a fixed hardware stack of two levels, seven or eight special-function hardware registers, direct/indirect/relative addressing modes for both data and instructions, an 8-bit real-time clock/counter (TMR0) with an 8-bit programmable prescaler, a Watchdog Timer (WDT) with its own on-chip RC oscillator, Power-On Reset (POR), and power-saving SLEEP mode. The "I" suffix denotes the industrial operating-temperature grade of -40C to +85C. The architecture uses a RISC-style instruction set with only 33 single-word single-cycle instructions; combined with the 4:1 internal clock divider relative to the external oscillator, a 10 MHz crystal yields a 2.5 MIPS instruction throughput. The OTP (one-time-programmable) EPROM allows prototype and low-to-medium-volume production programming using Microchip's MPLAB PM3 or comparable device programmers. Typical applications include consumer white goods control (washing machines, microwave ovens, coffee makers), simple sensor conditioning and display drivers, low-cost remote controls, hobbyist and education platforms, appliance user-interface replacement of discrete logic, and industrial timing/counter modules. The 28-pin SOIC footprint also makes it suitable as a drop-in upgrade path for older 8051-based designs where code density matters. When designing with this device, plan for an external clock source or crystal on OSC1/OSC2, place a 0.1uF decoupling capacitor within 5 mm of VDD, and note that the PIC16C5X family lacks interrupts and on-chip peripherals beyond TMR0/WDT - any advanced functionality (UART, ADC, PWM) must be implemented in software or added externally. Configuration word MCLR and oscillator selection bits must be set during programming and cannot be changed in-circuit. This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving procurement and design engineers a single decision-ready reference for the PIC16C55-10I/SO.

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PIC16C55-10I/SP - 8-bit PIC MCU, 768B OTP, 10MHz, 28-SPDIP | Microchip
PIC16C55-10I/SP

PIC16C55-10I/SP - 8-bit PIC MCU, 768B OTP, 10MHz, 28-SPDIP | Microchip

The Microchip Technology PIC16C55-10I/SP is an 8-bit CMOS RISC microcontroller in the PIC16C5x baseline family, offering 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory, 24 bytes of RAM, and 20 digital I/O pins in a 28-pin SPDIP (Skinny Plastic DIP) through-hole package. It executes most instructions in a single 200 ns cycle (10 MHz oscillator, 4:1 divider), delivering roughly 5 MIPS of throughput at 5 V while consuming very little supply current. 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 PIC16C5x family uses a 12-bit wide instruction word with a RISC architecture and a two-level deep hardware stack, allowing compact code density versus typical 8-bit CISC controllers in the same price category. Within Microchip's taxonomy, the PIC16C5x sits under PIC16 baseline microcontrollers -> 8-bit PIC MCUs -> microcontrollers -> integrated circuits. Key features of the PIC16C55-10I/SP include a programmable 8-bit real-time clock/counter (TMR0) with 8-bit prescaler, direct/indirect/relative addressing modes, seven or eight special function hardware registers, a watchdog timer for reliable unattended operation, and an internal power-on reset. The "I" suffix denotes the industrial temperature grade of -40 C to +85 C, and the "-10" speed suffix specifies the 10 MHz maximum oscillator frequency. The OTP memory is factory- or field-programmable once, which is well suited to low-to-medium volume production. Architecturally, the device is built on a CMOS process with EPROM program memory that retains code without battery backup. The 20 I/O pins are grouped into three ports (RA, RB, RC) and are individually configurable for digital input or output. Power consumption is reduced through SLEEP mode with wake-up via pin change or watchdog overflow, making the part attractive for battery- and line-powered appliances. Typical applications include consumer appliances, automotive sub-systems, security and alarm panels, simple motor controls, low-end remote controls, and industrial timers. The wide 3.0 V to 6.0 V supply range and industrial temperature grade make it usable in both commercial and harsh-environment products. When designing with the PIC16C55-10I/SP, note that this is an OTP part, so firmware bugs discovered after programming require part replacement rather than re-flash. The 2-level hardware stack means interrupt service routines and deep subroutines must be carefully structured. Decouple VDD with a 0.1 uF ceramic capacitor placed within 5 mm of the supply pin. This page synthesizes distributor pricing, drop-in alternatives, and practical design guidance that the manufacturer datasheet does not present in a single view.

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PIC16C55-10I/SS - 8-bit OTP MCU, 768B, 20 I/O, 10MHz, SSOP-28
PIC16C55-10I/SS

PIC16C55-10I/SS - 8-bit OTP MCU, 768B, 20 I/O, 10MHz, SSOP-28

The Microchip Technology PIC16C55-10I/SS is an 8-bit CMOS RISC microcontroller in a 28-pin SSOP (Shrink Small Outline Package), offering 768 bytes of One-Time-Programmable (OTP) program memory, 24 bytes of RAM, 20 digital I/O lines, and a 10 MHz maximum operating frequency. It is specified for industrial temperature range (-40C to +85C) and operates from a 4.5V to 5.5V single supply. As a member of the original PIC16C5x baseline family, it uses a 12-bit wide instruction word, a two-level hardware stack, and seven/eight special function registers. A baseline 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, program memory, and I/O peripherals. The PIC16C5x baseline sits at the entry level of Microchip's PIC16 hierarchy (PIC16C5x baseline -> PIC16F mid-range -> PIC16 enhanced mid-range), providing the smallest pin count and memory footprint for cost-sensitive embedded control. The baseline architecture offers deterministic instruction timing (most instructions execute in one cycle) and a RISC-style instruction set, making it approachable for simple state-machine and control tasks where a full mid-range PIC16F would be overkill. Key features of the PIC16C55-10I/SS include an 8-bit real-time clock/counter (TMR0) with a programmable prescaler, a watchdog timer for reliable operation, direct/indirect/relative addressing modes for both data and instructions, power-on reset, and an OTP program memory that is user-programmed once and cannot be erased - this suits low-cost, fixed-function products. The 20 I/O pins can source/sink up to 25 mA per pin, enabling direct drive of LEDs, optocouplers, and small relays. Architecturally, the device uses a Harvard memory layout (separate program and data buses) and a fixed instruction set of approximately 33 opcodes. The OTP cell technology keeps per-unit cost low and programming fast, while the industrial temperature grade allows deployment in factory automation, automotive aftermarket, and outdoor equipment. Programming is supported through the Microchip MPLAB PM3 Universal Device Programmer. Typical applications include appliance control boards, simple sensor interfaces, LED driving, hobby and education platforms, and low-cost consumer products. In an HVAC thermostat, for example, the 20 I/O lines can scan a keypad, drive a multiplexed LCD, read thermistor dividers, and switch a relay - all without external memory. The 10 MHz clock rate provides roughly 5 MIPS, sufficient for sampling rates up to ~250 kHz with polling-based firmware. When designing with this part, remember that OTP cannot be reprogrammed during development - use a windowed (JW) or EPROM variant for prototyping and reserve the OTP PIC16C55 for production. Also note that the PIC16C55 is now considered an older part, so check Microchip's PCN list for any last-time-buy or EOL status before committing to a new design. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the Microchip datasheet.

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PIC16C55-HS/P - 8-bit OTP MCU 20MHz 768B | Microchip
PIC16C55-HS/P

PIC16C55-HS/P - 8-bit OTP MCU 20MHz 768B | Microchip

The Microchip Technology PIC16C55-HS/P is an 8-bit CMOS RISC microcontroller built on the PIC16C5x baseline core, offering 768 bytes of one-time programmable (OTP) program memory and 24 bytes of RAM in a 28-pin PDIP through-hole package. The -HS speed grade specifies a 20 MHz maximum clock frequency, with the part running from a 3.3 V to 5.5 V supply and providing 20 digital I/O lines. PIC16C5x instruction words are 12 bits wide against an 8-bit data path, giving roughly 2:1 code compression versus competing 8-bit MCUs. What is an 8-bit OTP microcontroller? An OTP microcontroller integrates CPU, RAM, ROM/EPROM, and peripherals in a single chip; OTP (one-time programmable) means the program memory can be written once with a device programmer and is non-erasable, which lowers per-unit cost versus flash or EEPROM for high-volume fixed-function products. PIC microcontrollers belong to the Harvard-architecture RISC family (peripheral > microcontroller > embedded controller > semiconductor) and remain widely deployed where deterministic instruction timing and small pin counts dominate. Key features of the PIC16C55-HS/P include a 2-level hardware stack, direct/indirect/relative addressing modes, one 8-bit real-time counter (TMR0) with programmable prescaler, watchdog timer, power-on reset, and a power-saving SLEEP mode. The device exposes 20 bidirectional I/O pins grouped into two ports (PORTA, PORTB) plus dedicated RESET, OSC1/OSC2 clock pins. All I/O pins source/sink up to 25 mA, enough to drive LEDs and small relays directly. Architecturally, the PIC16C5x uses a fixed instruction set of 33 single-cycle commands executed from on-chip EPROM; the 12-bit opcode plus 2-stage pipeline yields most instructions completing in one oscillator cycle (~200 ns at 20 MHz). Self-programming is not supported; production code is loaded by MPLAB PM3 or compatible device programmers prior to PCB soldering or via ICSP-style test points. Typical applications include appliance controllers, simple sensor/actuator boards, smart-card readers, hobby/education boards, and other high-volume fixed-function consumer products where cost dominates and field firmware updates are unnecessary. Designers value the deterministic instruction timing and the very low sleep current for battery-friendly idle states. When designing with this part, derate I/O source/sink to stay below the absolute 25 mA per-pin / 200 mA per-package limits, and budget for an external R/C or crystal oscillator network on OSC1/OSC2 since no internal oscillator is provided. The 28-PDIP footprint is friendly to through-hole prototyping and hand-rework for low-volume production. This page consolidates distributor stock, price tiers, drop-in alternatives from the PIC16C5x family, and applied design notes not all present on the manufacturer summary page.

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PIC16C55-HS/SP - 8-bit CMOS MCU, 20MHz, 768B OTP, 28-SPDIP | Microchip
PIC16C55-HS/SP

PIC16C55-HS/SP - 8-bit CMOS MCU, 20MHz, 768B OTP, 28-SPDIP | Microchip

The Microchip Technology PIC16C55-HS/SP is an 8-bit CMOS RISC microcontroller featuring 768 bytes of OTP program memory, 24 bytes of RAM, and a 20 MHz maximum clock speed, housed in a 28-pin SPDIP (Skinny Plastic DIP) through-hole package. The HS suffix denotes the high-speed oscillator mode, supporting external clock inputs up to 20 MHz, while the /SP suffix indicates the SPDIP package variant. According to the PIC16C5X family datasheet, the device operates from a 4.5V to 5.5V supply and delivers 12-bit wide instructions with an 8-bit data path for compact code density. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and I/O peripherals on one die. Within the broader taxonomy, the PIC16C5X belongs to the classic baseline PICmicro family, which sits below the mid-range PIC16 and enhanced PIC18 families in Microchip's product hierarchy. These baseline MCUs use a 12-bit instruction word optimized for compact code storage on small OTP or ROM memories, making them ideal for cost-sensitive, high-volume embedded control. Key features of the PIC16C55-HS/SP include seven or eight special-function hardware registers, a two-level deep hardware stack, direct/indirect/relative addressing modes, an 8-bit real-time clock/counter (TMR0), and four oscillator selection options (RC, XT, HS, LP). The architecture delivers roughly twice the code compression of competing 8-bit MCUs in its price class, with 20 bidirectional digital I/O lines grouped across multiple ports. The 28-SPDIP package retains drop-in compatibility with the rest of the PIC16C5X family, simplifying PCB reuse across 28-pin baseline PICmicro designs. The PIC16C55 uses a Harvard RISC architecture with separate program and data buses, executing most instructions in a single 200 ns cycle at 20 MHz. The OTP program memory supports one-time programming for production volume, while the 24-byte RAM accommodates small data sets typical of appliance, sensor, and human-interface control. The TMR0 counter with programmable prescaler, combined with the watchdog timer and power-on reset, gives designers sufficient on-chip peripherals for straightforward control loops. Typical applications include remote controls, small appliance controllers, LED lighting drivers, simple sensor interfaces, and consumer electronics where cost per node is critical. The high-speed 20 MHz oscillator mode supports timing-sensitive tasks such as IR remote protocols, while the low-power LP mode enables battery-powered devices. The 28-pin SPDIP footprint remains popular in educational, hobbyist, and legacy industrial designs. When designing with this part, choose between the HS, XT, LP, or RC oscillator modes based on clock-source frequency. The HS mode requires a 4-20 MHz crystal or external clock; LP mode enables 32 kHz low-power operation. Always decouple VDD with a 0.1 uF ceramic capacitor placed within 5 mm of the supply pin, and reserve the MCLR pin for a proper reset network if in-circuit debugging is not required. This page synthesizes distributor pricing, drop-in baseline PIC16C5X alternatives, and practical design notes not found on a single manufacturer or distributor page, providing engineering context beyond the baseline datasheet.

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PIC16C55-HSE/SO - 8-bit OTP MCU, 16MHz, 768B | Microchip
PIC16C55-HSE/SO

PIC16C55-HSE/SO - 8-bit OTP MCU, 16MHz, 768B | Microchip

The Microchip Technology PIC16C55-HSE/SO is an 8-bit PIC® 16C family microcontroller featuring a 16MHz maximum clock speed, 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, and a 28-pin SOIC (7.50 mm width) surface-mount package. It belongs to the baseline PIC16C5x family, the industry's first RISC-architecture 8-bit microcontrollers, and uses a 12-bit wide instruction set that yields roughly 2:1 code compression versus typical 8-bit CISC competitors. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, digital I/O, timers, and interrupt logic into one package. The PIC16C5x family uses a Harvard architecture with separated program and data paths, allowing instruction fetch and operand read to occur in the same cycle - this is why the baseline PIC executes nearly every instruction in a single 200 ns cycle at 20 MHz. MCUs sit at the lowest tier of embedded computing (MCU -> 8-bit microcontroller -> microcontroller -> embedded processor) and are the workhorses of appliance control, sensor reading, and human-machine interface products. Key features of the PIC16C55-HSE/SO include the 20 MHz 'HS' high-speed oscillator option (the -HSE/ suffix selects the high-speed crystal mode with the part rated for 16 MHz at 5 V), 25 bytes of RAM, 20 source-capable digital I/O pins, a watchdog timer, a 4-channel 8-bit analog-to-digital converter is NOT present on this baseline part (the PIC16C55 is digital-only - the 'C' suffix variant adds ADC), and an 8-bit timer/counter. The part runs from 2.5 V to 6.25 V, allowing it to operate directly from a 5 V regulated rail or from a 3-cell battery stack. The architecture is RISC-based with only 33 single-word/12-bit instructions, and the two-stage pipeline lets every instruction except branches execute in one cycle. The 25-byte general-purpose RAM is mirrored across all four banks of the data memory map (typical for the PIC16C5x baseline family), and I/O registers include the standard PORTA and PORTB latches, the TRIS direction registers, the OPTION register, and the TMR0 timer/counter. Brown-out detection is not present on the baseline 'C55' part but is available on the 'C55A' revision. Typical applications include legacy industrial control boards, simple appliance controllers, low-end consumer electronics, sensor front-ends, and educational/hobby designs where deterministic timing and code efficiency matter more than RAM or peripheral richness. The 28-SOIC package also makes it easy to hand-solder prototypes and rework production boards. The PIC16C55-HSE/SO is widely used as a drop-in upgrade for older PIC16C54 designs that need more I/O and instructions, and is supported by the MPLAB PM3 universal programmer plus all current MPLAB X IDE toolchains. When designing with this part, remember that OTP means the program memory cannot be erased - it is blank from the factory and must be programmed once at production. For prototyping, the PIC16C55/JW windowed ceramic version or the PIC16F55 Flash equivalent are recommended instead. Also note that the 'HSE' suffix selects the high-speed crystal oscillator mode; using a low-frequency crystal will halve the throughput and waste the part's capability. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the bare manufacturer datasheet.

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PIC16C55-HSE/SP - 8-Bit 16MHz OTP MCU 28-SPDIP | Microchip
PIC16C55-HSE/SP

PIC16C55-HSE/SP - 8-Bit 16MHz OTP MCU 28-SPDIP | Microchip

The Microchip Technology PIC16C55-HSE/SP is an 8-bit OTP (One-Time-Programmable) CMOS microcontroller in the PIC16C5X baseline family, offering a 16 MHz maximum clock speed and 768 bytes (512 x 12) of program memory in a 28-pin SPDIP (Skinny Plastic DIP) through-hole package. It features 24 bytes of RAM, 20 programmable digital I/O pins, a 12-bit instruction word, and a 2-level hardware stack, with the /SP suffix indicating the SPDIP package and HSE denoting the high-speed 16 MHz oscillator variant. A PIC (Peripheral Interface Controller) microcontroller is a compact, low-cost embedded computing device built around a RISC (Reduced Instruction Set Computer) core, with program memory, data RAM, and peripherals integrated onto a single silicon die. Microcontrollers in the PIC16C5X baseline family sit within the hierarchy: MCU -> 8-bit microcontroller -> PIC16 baseline family -> PIC16C5X subgroup -> CMOS OTP -> industrial control IC. The baseline architecture is the original PIC core that launched Microchip's dominance in low-power embedded control, prized for deterministic execution, low quiescent current, and a tiny 33-instruction set that simplifies code generation in assembly or C. Key features of the PIC16C55-HSE/SP include a single 8-bit timer/counter (Timer0), a watchdog timer with on-chip RC oscillator for reliable brown-out recovery, power-saving sleep mode, and a wide operating voltage range of 2.5 V to 6.25 V. The HSE suffix specifies the oscillator range (high-speed, 16 MHz crystal/resonator), while the CMOS process enables low power consumption suitable for battery-backed and always-on applications. The baseline architecture executes one instruction per instruction cycle (4 clock cycles), giving a 100 ns minimum instruction time at 40 MHz-equivalent performance. Typical applications include low-cost industrial control loops, appliance control boards, sensor signal conditioning front-ends, automotive body and accessory controllers (in non-safety roles), and legacy embedded products where OTP one-time-programmability is acceptable. The 20 I/O pins can directly drive LEDs, keypads, and small relays, while internal pull-ups simplify matrix-scanned user interfaces. Designers should note that the PIC16C55 lacks in-circuit serial programming (ICSP), in-circuit debugging, and any analog peripherals (no ADC, no comparators), so it is best suited for digital glue logic and simple control tasks where high-pin-count analog or field-updatable firmware is not required. This page synthesizes real distributor stock and pricing, drop-in same-package alternatives from Microchip's own baseline PIC16C5X family, and practical design notes not found in the original manufacturer datasheet - giving procurement and firmware engineers a single source to evaluate, source, and design around the PIC16C55-HSE/SP. For long-life industrial designs, consider the flash-based PIC16F54 or PIC16F57 as a drop-in firmware-compatible upgrade path; for ultra-low power, the PIC16LF series offers lower VDD operation at the cost of oscillator frequency.

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PIC16C55-HSI/P - 8-Bit 20MHz OTP MCU 768B | Microchip | PDIP-28
PIC16C55-HSI/P

PIC16C55-HSI/P - 8-Bit 20MHz OTP MCU 768B | Microchip | PDIP-28

The Microchip Technology PIC16C55-HSI/P is an 8-bit CMOS RISC microcontroller in the PIC16C5x baseline family, offering 20 MHz maximum operating frequency, 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory, and 24 bytes of RAM, packaged in a 28-pin PDIP through-hole form factor. The "HS" oscillator designator denotes a High-Speed crystal/ceramic resonator mode, and the "I" suffix indicates the industrial temperature grade (-40C to +85C), while "/P" specifies the PDIP package. The device features 20 digital I/O pins, an 8-bit real-time clock/counter (TMR0), a two-level hardware stack, and direct/indirect/relative addressing modes for data and instructions. A baseline PIC microcontroller is a member of the simplest tier in Microchip's 8-bit PIC architecture family, optimized for cost-sensitive embedded control. Within the system hierarchy it sits below mid-range (PIC16) and enhanced mid-range (PIC16F1xxx) devices; baseline parts trade advanced peripherals for the lowest unit cost and the smallest instruction set (33 instructions, 12-bit wide). They are widely used in simple control loops, timers, and glue-logic replacement roles where computation demands are modest and pin-count is moderate. Key specifications of the PIC16C55-HSI/P include 20 MHz maximum clock (200 ns instruction cycle), 768 bytes of OTP program memory organized as 512 x 12 words, 24 bytes of general-purpose RAM, 20 I/O pins, a single 8-bit timer/counter (TMR0) with an 8-bit prescaler, and an operating voltage range suitable for 5V systems. The device also includes a watchdog timer (WDT), power-on reset (POR), and an industrial-grade temperature rating. Its 12-bit instruction word yields a 2:1 code compression advantage over many competing 8-bit architectures in the same price class, reducing program-memory consumption for typical control firmware. Architecturally, the PIC16C55-HSI/P uses a Harvard memory layout with separate program and data buses, enabling instruction fetch and operand access in a single cycle. The RISC-style instruction set comprises 33 fixed-width 12-bit opcodes, with all instructions executing in a single instruction cycle except branches (two cycles). This simplicity makes the part straightforward to program in assembly and provides deterministic real-time behavior, which is valuable in hard-real-time control applications. Typical applications include appliance controls, simple sensor interfaces, LED driving and lighting controllers, low-cost consumer electronics, battery chargers, and hobbyist/educational embedded projects. The 28-pin PDIP package is also favored for through-hole prototype boards and educational development kits where socketed parts simplify repeated programming cycles. When designing with this part, note that OTP memory can only be programmed once - prototype firmware must be validated on UV-erasable (JW) windowed variants or flash-based PIC16F5x equivalents before committing to OTP. A high-speed oscillator mode (HS) requires an external crystal or resonator in the 4 MHz to 20 MHz range, with proper PCB layout and load-capacitor selection to ensure stable startup. This page synthesizes distributor availability, drop-in alternatives from the PIC16C5x family, and design considerations not aggregated in the manufacturer datasheet alone - giving engineers a single reference for sourcing, replacement, and integration of the PIC16C55-HSI/P.

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PIC16C55-HSI/SO - 8-Bit 20MHz OTP MCU 768B | Microchip 28-SOIC
PIC16C55-HSI/SO

PIC16C55-HSI/SO - 8-Bit 20MHz OTP MCU 768B | Microchip 28-SOIC

The Microchip PIC16C55-HSI/SO is an 8-bit CMOS microcontroller from Microchip's PIC16C5X family, featuring a 20 MHz maximum oscillator input, 768 bytes of EPROM-based program memory organized as 512 x 12 words, and 24 to 32 bytes of RAM (depending on family variant). It is housed in a 28-pin SOIC (SO, 7.50 mm width, 0.295 inch) surface-mount package. The device is a one-time-programmable (OTP) EPROM variant, designed for low-cost, high-performance, fully-static 8-bit embedded control. The "-HSI" suffix denotes a high-speed oscillator variant rated to 20 MHz with an industrial temperature grade. An 8-bit microcontroller (MCU) is a small computer-on-a-chip containing a CPU, RAM, ROM/EPROM/Flash program memory, I/O ports, and one or more timers on a single die. It belongs to the broader hierarchy: microcontroller -> embedded processor -> semiconductor -> integrated circuit. The PIC16C5X family uses a RISC-style Harvard architecture with separate program and data buses, a 12-bit-wide instruction word, and an 8-bit-wide data path, allowing single-cycle instruction execution on most instructions. This contrasts with 8051-family CISC designs that often need multiple cycles per opcode. Key differentiating specifications include a 12-bit instruction word (vs 14-bit on PIC16C6X/7X), a two-level hardware stack (vs 8-level on PIC16C6X), 20 I/O pins with high-current sink/source capability, an 8-bit real-time counter/timer (TMR0) with an 8-bit programmable prescaler, and direct/indirect/relative addressing modes for both data and instructions. The PIC16C55 family supports 33 single-word instructions with a 200 ns instruction cycle at 20 MHz oscillator input. Typical applications for the PIC16C55-HSI/SO include low-cost consumer appliances, automotive body controllers (non-AEC-Q), industrial timer/counter modules, simple sensor conditioning front-ends, remote-control transmitters, and replacement of discrete logic in glue-logic consolidation designs. The 28-SOIC package is suitable for hand-soldered prototypes and automated SMT lines where DIP packages would be too tall. When designing with the PIC16C55-HSI/SO, remember that OTP parts cannot be re-programmed in-circuit after the window-sealable ceramic package has been exposed to UV - the SOIC version has no erasure window, so code is committed at first programming. For development, use the JW (windowed CERDIP) variant of the same die for iterative code cycles. The device is no longer recommended for new designs (NRND) by Microchip; consider PIC16F54 or PIC16F57 flash-based parts as modern equivalents. This page synthesizes distributor pricing, drop-in alternatives within the same PIC16C55/PIC16C57 family, and practical design notes not aggregated on a single manufacturer page.

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