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PIC16C55A-20I/P - 8-Bit 20MHz OTP MCU 768B | Microchip
PIC16C55A-20I/P

PIC16C55A-20I/P - 8-Bit 20MHz OTP MCU 768B | Microchip

The Microchip PIC16C55A-20I/P is a low-cost, high-performance 8-bit fully-static EPROM/ROM-based CMOS microcontroller in a 28-pin PDIP package, operating at 20 MHz with industrial temperature range support. It integrates 768 bytes of program memory (512 x 12 OTP), 24 bytes of RAM, and 20 general-purpose I/O pins, providing a compact solution for simple embedded control. A microcontroller (MCU) is a single-chip computer that contains a processor core, memory, and programmable input/output peripherals. The PIC16C5X family from Microchip Technology belongs to the broader category of 8-bit microcontrollers -> microcontrollers -> microprocessors -> semiconductors. These devices implement a RISC architecture with 33 single-word, single-cycle instructions and a 12-bit wide instruction word, achieving 2:1 code compression over competing 8-bit MCUs in the same price class. Key features of the PIC16C55A-20I/P include a 20 MHz maximum clock speed, 20 MHz operating frequency, a two-level deep hardware stack, direct/indirect/relative addressing modes, and an 8-bit real-time clock/counter (TMR0) with 8-bit programmable prescaler. It supports a wide operating voltage range typical of the PIC16C5X family, with low power consumption suitable for battery and industrial applications. From an architectural standpoint, the device uses a Harvard-style separated program and data bus, with the 12-bit instruction path enabling efficient encoding of arithmetic, branch, and bit-oriented operations in a single cycle. The PIC16C55A derivative of the PIC16C5X series offers expanded I/O (20 pins) and program memory (512 x 12) relative to the PIC16C54 base device, with OTP one-time-programmable EPROM for cost-sensitive production runs. Note: This device is marked as 'Not Recommended for new designs' (NRND) by Microchip; for new designs, Microchip recommends the PIC16F57-I/P family. Typical applications include industrial control logic, automotive body electronics, simple sensor interfaces, appliance controls, and battery-powered instrument subsystems. The 20 MHz instruction execution rate and 20 GPIO make the device well-suited for tasks such as keypad scanning, LED driving, and low-speed serial protocols. Industrial temperature grade (-40C to +85C) extends its suitability to factory automation and outdoor equipment. When designing with the PIC16C55A-20I/P, ensure the system clock source (RC oscillator, crystal, or resonator) matches the 20 MHz maximum rating, and respect the two-level hardware stack depth when writing interrupt or call-heavy code. Engineers targeting new designs should evaluate the Flash-based PIC16F57-I/P as a migration path that preserves pin-out while adding reprogrammability and longer-life cycle status. This page synthesizes distributor stock levels, parametric equivalents, pricing tiers, and practical design notes not found in the manufacturer datasheet, enabling faster component selection and risk assessment for both new designs and legacy maintenance scenarios.

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PIC16C55A-20I/SP - 8-bit OTP MCU, 20MHz, 768B, SPDIP-28 | Microchip
PIC16C55A-20I/SP

PIC16C55A-20I/SP - 8-bit OTP MCU, 20MHz, 768B, SPDIP-28 | Microchip

The Microchip Technology PIC16C55A-20I/SP is a member of the PIC16C5X family of 8-bit CMOS microcontrollers featuring a RISC architecture with 12-bit wide instructions and an 8-bit wide data path. The device operates at a maximum clock speed of 20 MHz, contains 768 bytes (512 x 12) of one-time-programmable (OTP) program memory and 24 bytes of RAM, and provides up to 20 digital I/O pins in a 28-pin SPDIP package. The "/SP" suffix denotes the SPDIP-28 through-hole package while the "/I" suffix denotes the industrial operating temperature range of -40C to +85C. A microcontroller (MCU) is a single-chip computer containing a CPU, program memory, working RAM, and peripherals such as I/O ports, timers, and interrupt logic. Within the broader taxonomy, the PIC16C55A belongs to the 8-bit MCU class -> RISC MCU -> Harvard-architecture MCU -> embedded controller -> semiconductor. The PIC16C5X family uses a 12-bit instruction word with a 2:1 code compression advantage over competing 8-bit MCUs of its era, and its symmetric instruction set reduces development time significantly. Key features of the PIC16C55A-20I/SP include seven or eight special function hardware registers, a two-level deep hardware stack, and direct, indirect, and relative addressing modes for both data and instructions. An 8-bit real-time clock/counter (TMR0) with a programmable prescaler is integrated, along with a watchdog timer for unattended operation. The architecture uses a modified Harvard design with separate program and data buses for deterministic instruction execution. Typical applications include appliance control, automotive subsystems, industrial process control, security and access systems, and low-end consumer products where cost-sensitive embedded control is needed. The device is supported by the PICmicro Mid-Range Reference Manual and the MPLAB PM3 Universal Device Programmer for code development and OTP programming. When designing with this part, note that OTP memory cannot be reprogrammed in-circuit - firmware bugs require part replacement. Provide a clean +5V supply with adequate decoupling (100 nF plus 10 uF bulk) on VDD, and respect the 5V absolute maximum rating when driving industrial loads. The PIC16C55A is rated for 5V operation only and does not support the wider voltage range of later Flash-based PIC16F parts. This page synthesizes distributor pricing, drop-in pin-compatible alternatives within the PIC16C5X family, lifecycle status, and practical design notes not consolidated in any single manufacturer document.

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PIC16C55A-20I/SS - 8-Bit 20MHz 768B OTP MCU SSOP-28 | Microchip
PIC16C55A-20I/SS

PIC16C55A-20I/SS - 8-Bit 20MHz 768B OTP MCU SSOP-28 | Microchip

The Microchip Technology PIC16C55A-20I/SS is an 8-bit CMOS ROM-based microcontroller from the PIC16C5X family, delivering 20MHz maximum clock speed with 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory in a 28-pin SSOP package. The device provides 24 bytes of RAM, 20 digital I/O lines, and is rated for industrial temperature operation from -40C to +85C. According to the Microchip product page, this part carries a "Not Recommended for new designs" status, meaning it remains available for legacy maintenance but Microchip directs new designs to the Flash-based PIC16F5X family. An 8-bit microcontroller is a single-chip computer that integrates a CPU, program memory, working RAM, and peripheral I/O on one die. The PIC16C5X family implements a RISC Harvard architecture with 12-bit-wide instructions and an 8-bit-wide data path, achieving approximately 2:1 code compression over other 8-bit MCUs in its class. Within the broader microcontroller hierarchy, the PIC16C55A belongs to the mid-range 8-bit category, positioned between baseline PIC10/12/16 devices and 16-bit PIC24/dsPIC families. OTP program memory allows one-time factory or field programming using a device programmer such as the MPLAB PM3, making the part cost-optimized for high-volume fixed-function products. Key features of the PIC16C55A-20I/SS include a 20MHz maximum operating frequency, 24-byte general-purpose RAM, 20 bidirectional I/O pins, one 8-bit real-time clock/counter (TMR0), Power-On Reset (POR), Watchdog Timer (WDT), and a two-level hardware stack supporting direct, indirect, and relative addressing modes. Seven or eight special-function hardware registers manage peripheral control. The 28-pin SSOP package provides compact surface-mount integration at approximately 5.3mm body width, well-suited for space-constrained designs. The PIC16C55A uses a RISC architecture executing most instructions in a single cycle, with a 12-bit instruction word and 33 single-word instructions. This compact instruction set yields high code density, reducing total program memory requirements and overall system cost. The two-level hardware stack limits call depth to two levels, which constrains interrupt-driven or deeply nested subroutine architectures but is adequate for simple sequential control loops. Typical applications include appliance control, industrial sensor interfaces, simple motor drivers, LED controllers, consumer electronics, automotive subsystems (non-safety), battery chargers, and any cost-sensitive embedded system where the OTP memory model fits the production volume profile. The industrial temperature grade extends applicability to factory automation, HVAC controls, and outdoor equipment. When designing with this device, plan for the two-level hardware stack limitation, the OTP memory programming workflow (which requires a device programmer and cannot be re-flashed in-circuit), and the legacy lifecycle status. For new designs, evaluate Flash-based PIC16F5X equivalents that provide in-circuit programmability and longer-term supply assurance.

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PIC16C55A-40/P - 8-Bit OTP MCU 40MHz 768B | Microchip | 28-PDIP
PIC16C55A-40/P

PIC16C55A-40/P - 8-Bit OTP MCU 40MHz 768B | Microchip | 28-PDIP

The Microchip Technology PIC16C55A-40/P is an 8-bit RISC microcontroller from the PIC16C5X family, featuring 768 bytes of One-Time-Programmable (OTP) program memory organized as 512 x 12 words, 32 bytes of RAM, and a maximum clock frequency of 40 MHz. It is housed in a 28-pin Plastic DIP (PDIP) through-hole package with a 0.600 inch (15.24 mm) row spacing, making it suitable for legacy through-hole designs, prototyping, and industrial control boards. What is a PIC microcontroller? A PIC (Peripheral Interface Controller) is a family of 8-bit Harvard-architecture RISC microcontrollers originally developed by General Instrument's microelectronics division and later popularized by Microchip Technology. PIC microcontrollers occupy the hypernym hierarchy: microcontroller -> embedded processor -> integrated circuit -> semiconductor. They are widely used in embedded systems for their low cost, simple instruction set, deterministic timing, and broad peripheral integration. Key features of the PIC16C55A include a 12-bit instruction word delivering 2:1 code compression versus competitors in its class, 20 I/O pins, a watchdog timer, power-on reset, and an operating voltage range of 3.0 V to 5.5 V. The 40 MHz speed grade denotes the maximum oscillator frequency; the instruction cycle is one quarter of the oscillator frequency (4 MHz instruction rate at 40 MHz clock). The PIC16C55A is built on a CMOS process with EPROM/OTP program memory, delivering approximately an order-of-magnitude higher performance than its 8-bit competitors in the same price category. The device supports commercial temperature grades (0C to +70C) and is targeted at cost-sensitive, high-volume embedded applications. Typical applications include simple motor control, appliance control, automotive body electronics (non-safety), remote transmitters, sensor interfaces, and consumer electronics where proven 8-bit performance is sufficient. The 28-PDIP package enables hand-soldering and socket replacement, simplifying prototyping and field service. When designing with this part, note that the OTP memory cannot be re-programmed in-circuit. Engineers evaluating modern replacements should consider the PIC16F54 or PIC16F57 in PDIP packages, which offer Flash memory for iterative development while sharing code compatibility. This page synthesizes distributor pricing, lifecycle status, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16C55A-40/SS - 8-bit 40MHz OTP MCU, 768B Code | Microchip
PIC16C55A-40/SS

PIC16C55A-40/SS - 8-bit 40MHz OTP MCU, 768B Code | Microchip

The Microchip Technology PIC16C55A-40/SS is an 8-bit RISC-based OTP (One-Time Programmable) microcontroller from the PIC16C5X family, featuring 768 bytes of program memory, 24 bytes of RAM, and 20 I/O pins, operating at up to 40 MHz clock frequency and housed in a 28-pin SSOP (Shrink Small Outline Package) with gull-wing leads. It belongs to Microchip's baseline PIC family, the industry's first 8-pin to 28-pin family of microcontrollers, designed for cost-sensitive embedded applications with simple control tasks. What is a microcontroller (MCU)? A microcontroller is a single-chip computer that integrates a CPU core, memory (program + data), and peripheral interfaces (I/O, timers, etc.) into one IC. Within that hierarchy, the PIC16C5X sits in the baseline 12-bit-instruction family, which later expanded into the enhanced mid-range (14-bit) and PIC18 (16-bit) families. The 12-bit wide instructions deliver high code density - typically 2:1 compression versus competing 8-bit MCUs - allowing more functionality to fit in the small on-chip OTP memory. Key features of the PIC16C55A-40/SS include 768 bytes of EPROM program memory (OTP), 24 bytes of data RAM, a 4 MHz internal RC oscillator option (selected at programming), a 40 MHz maximum external clock input, and 20 bidirectional digital I/O pins across two ports (RA, RB). The device has only 28 instructions, enabling fast learning curves, and provides a watchdog timer with on-chip RC oscillator for reliable unattended operation. Architecturally, the PIC16C55A uses a Harvard architecture with separate program and data buses, a single accumulator-based ALU, and a deep hardware stack for subroutine nesting. The 12-bit instruction width and 8-bit data path balance code density against silicon cost, which is why this family remains popular in high-volume appliance and consumer products where BOM cost dominates. Typical applications include remote controls, small appliance controllers (toasters, coffee machines, fan controllers), security keypads, sensor signal conditioning, LED chaser/sequencer lights, and simple battery-operated toys. Its 20 I/O pins are sufficient to scan 4x4 keypads while driving multiplexed displays. When designing with this part, plan for one-time programming: the EPROM memory cannot be erased. For prototype work, use a windowed (JW) variant or a pin-compatible Flash MCU (PIC16F) for in-circuit reprogramming. The 28-pin SSOP footprint is shared with the PIC16C55, PIC16C554, and PIC16C558 families, simplifying PCB layout reuse across product variants. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes - information not consolidated on any single distributor or manufacturer page. All specifications are sourced from the Microchip PIC16C55A datasheet and distributor listings verified as of 2026-09-16.

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PIC16C55AT-04/SO - 8-Bit 4MHz OTP MCU 768B | Microchip
PIC16C55AT-04/SO

PIC16C55AT-04/SO - 8-Bit 4MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C55AT-04/SO is an 8-bit RISC microcontroller from the PIC16C5X family, featuring 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory, 24 bytes of RAM, and 20 digital I/O pins. The device operates from a single 5V supply and runs at a 4 MHz oscillator frequency in a 28-pin SOIC wide-body package supplied on tape-and-reel. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and I/O peripherals on a single silicon die. The PIC16C5X family uses a 12-bit-wide instruction word with a RISC (Reduced Instruction Set Computer) architecture that delivers roughly 2:1 code compression versus other 8-bit MCUs in its class, enabling simpler firmware development. Within the broader taxonomy, this part is a microcontroller (MCU) -> embedded controller -> semiconductor device, designed for cost-sensitive embedded control where deterministic instruction timing and minimal external components are priorities. Key features of the PIC16C55AT-04/SO include a 4 MHz internal/external clock input, 33 single-word instructions, a two-level hardware stack, 20 bidirectional I/O pins organized into three ports (RA, RB, RC), and a programmable Watchdog Timer (WDT) with on-chip RC oscillator. The OTP program memory is programmed once via Microchip's standard ICSP-compatible serial programming interface. Power consumption is typically 2 mA at 5V/4 MHz, with sleep/idle current under typical CMOS standby levels. The device is built on a baseline PIC architecture using static CMOS logic, meaning the clock can be stopped without losing internal register state - useful for power-saving designs. It supports interrupt-driven control via the global interrupt enable and individual peripheral flags, and includes a Power-on Reset (POR), power-up Timer (PWRT), and Oscillator Start-up Timer (OST) for reliable cold-start behavior without external reset circuitry. Typical applications include appliance control, automotive body electronics (non-safety), LED display drivers, simple sensor interfaces, and remote transmitters/receivers. The wide SOIC-28 footprint is suitable for hand-soldered prototypes as well as high-volume SMT production lines. When designing with the PIC16C55AT-04/SO, note that OTP memory cannot be erased or reprogrammed - firmware bugs require physical part replacement. Engineers targeting field updates should consider the flash-based PIC16F5X family instead. The /SO suffix indicates the SOIC-28 wide-body tape-and-reel packaging for SMT assembly. This page synthesizes distributor pricing, drop-in alternatives, comparison data, and practical design notes not found in the manufacturer datasheet, helping engineers source and integrate this legacy OTP MCU efficiently.

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PIC16C55AT-04/SS - 8-bit OTP MCU 768B 20 I/O 4MHz SSOP-28 | Microchip
PIC16C55AT-04/SS

PIC16C55AT-04/SS - 8-bit OTP MCU 768B 20 I/O 4MHz SSOP-28 | Microchip

The Microchip Technology PIC16C55AT-04/SS is a member of the PIC16C5X family of low-cost, high-performance 8-bit fully-static EPROM/ROM-based CMOS microcontrollers. Housed in a 28-pin SSOP package (0.209", 5.30 mm width), it integrates 768 bytes of One-Time-Programmable (OTP) program memory organized as 512 x 12, 24 bytes of data RAM, and 20 digital I/O pins. The device operates from a 3 V to 6.25 V supply and runs at a maximum clock speed of 4 MHz, executing most instructions in a single 250 ns cycle. What is an 8-bit OTP microcontroller? An 8-bit OTP MCU is a small, fixed-instruction-set processor whose program memory can be written exactly once (One-Time-Programmable) using an EPROM-style bit cell. The "8-bit" designation refers to the width of the ALU and the data bus; the PIC16C5X family uses a 12-bit-wide instruction word to achieve 2:1 code compression over competing 8-bit MCUs. In the broader taxonomy, OTP microcontrollers sit between mask-ROM MCUs (cheapest at high volume) and Flash MCUs (re-programmable, higher cost per bit). They are favored for cost-sensitive, high-volume, stable-firmware applications. Key features include a RISC architecture with only 33 single-word/single-cycle instructions, an 8-bit timer/counter, a watchdog timer for reliable operation, and a power-saving SLEEP mode. The device is built on a CMOS process that yields low power consumption and high noise immunity. It supports in-circuit serial programming through Microchip's standard tools and is compatible with the PICSTART Plus and MPLAB development environments, allowing the same firmware to migrate across the PIC16C5X family. Typical applications for the PIC16C55AT-04/SS include low-end consumer appliances, automotive sub-systems (body controllers, lighting drivers), industrial control loops, sensor interfaces, and remote-control transmitters. The 20 I/O pins are well-suited to keypad scanning, LED matrix driving, and small-stepper or DC-motor control via external drivers. The industrial-grade temperature range and SSOP footprint also enable space-constrained designs. When designing with this device, allocate I/O pins carefully because the PIC16C5X has a fixed 12-bit program word and limited RAM (24 bytes); high-volume data structures should be stored in program memory using RETLW lookup tables. Place a 0.1 microfarad decoupling capacitor within 5 mm of VDD and use the on-chip oscillator with a 4 MHz crystal or ceramic resonator; bypass the MCLR pin according to the datasheet to ensure a clean reset. This page synthesizes distributor pricing, drop-in alternatives from the same PIC16C5X family, and practical design notes that complement the manufacturer datasheet.

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PIC16C55AT-04E/SO - 8-Bit 4MHz OTP MCU 28-SOIC | Microchip
PIC16C55AT-04E/SO

PIC16C55AT-04E/SO - 8-Bit 4MHz OTP MCU 28-SOIC | Microchip

The Microchip Technology PIC16C55AT-04E/SO is an 8-bit PIC microcontroller from the PIC16C5X family, featuring a RISC CPU core operating at 4 MHz, 768 bytes (512 x 12) of One-Time-Programmable (OTP) EPROM program memory, and 25 bytes of RAM, housed in a 28-pin SOIC wide-body package. Operating from 3.0 V to 5.5 V and -40 C to +125 C, it delivers deterministic performance for embedded control applications. Tape-and-reel suffix ("/SO") indicates the factory packaging form for high-volume SMT assembly lines. An 8-bit OTP microcontroller is a single-chip computer built around an 8-bit data path with non-volatile program memory that can be written exactly once via EPROM programming. In the system hierarchy, OTP MCUs sit below flash-based MCUs (re-programmable) and above mask-ROM MCUs (factory-programmed), within the broader category of microcontrollers, embedded controllers, and finally semiconductors. The PIC16C5X family pioneered Microchip's baseline RISC architecture with 12-bit wide instructions yielding 2:1 code compression versus 8-bit competitors. Key features include 20 digital I/O pins, a hardware timer/counter, watchdog timer, power-on reset, brown-out detection, and low-power SLEEP mode. The fully static CMOS design eliminates the need for a continuous clock and supports DC operation down to zero frequency, allowing the device to wake from interrupts for ultra-low standby power. The 12-bit instruction set is highly orthogonal, reducing development time and code density. The device employs a Harvard architecture with separate program and data buses, single-cycle instructions (except program branches which take two), and a four-stage pipeline. The 4 MHz clock with 250 ns instruction cycle delivers up to 4 MIPS throughput, sufficient for sensor reading, simple actuator control, and user-interface tasks in cost-sensitive embedded products. Typical applications include industrial control, consumer electronics, automotive body and convenience subsystems, and white-goods appliance controllers. The 28-SOIC footprint is well suited for hand-soldered prototypes as well as high-volume pick-and-place production. When designing, allocate one port pin to MCLR, leave adequate decoupling on VDD/VSS, and verify timing budgets using worst-case 4 MHz oscillator tolerance. The 'E' suffix denotes the extended temperature grade (-40 C to +125 C), required for automotive and industrial environments. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16C55AT-04E/SS - 8-bit 4MHz OTP MCU 768B | Microchip
PIC16C55AT-04E/SS

PIC16C55AT-04E/SS - 8-bit 4MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C55AT-04E/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, operating at up to 4 MHz with 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory and 25 bytes of RAM in a 28-pin SSOP package. The extended (-E) temperature grade and tape-and-reel (T) suffix make this variant suitable for industrial-grade surface-mount designs and high-volume automated assembly. Core architecture delivers RISC performance with 33 single-word instructions, 12-bit-wide instruction words, and 8-level deep hardware stack. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals on one die. Within the broader semiconductor taxonomy it sits below microprocessors (no on-chip memory) and above digital signal processors (no general-purpose I/O model). The PIC16C5X family is positioned as a low-cost, high-performance baseline 8-bit MCU family. Program memory is OTP (one-time programmable) EPROM rather than flash, which reduces per-unit cost in mature, code-stable applications but requires masked-ROM or windowed-EPROM alternatives for prototyping or low-volume runs. Key features include 20 general-purpose digital I/O pins arranged across ports A and B, an integrated Watchdog Timer (WDT) with on-chip RC oscillator for reliable operation, a Power-On Reset (POR) circuit, and a 4 MHz internal/external clock domain. The device operates from 2.5 V to 6.25 V across the extended -40C to +125C industrial temperature range. The 28-SSOP package has 5.30 mm body width and gull-wing leads compatible with standard surface-mount reflow profiles. Designers choose this part for cost-sensitive embedded control loops where 768 bytes of code are sufficient - appliance timers, remote-control transmitters, low-end sensor interfaces, simple motor controllers, and battery-powered instrumentation. The RISC core delivers deterministic instruction timing that simplifies real-time scheduler design. Because program memory is OTP EPROM, code must be fully validated before programming - this part is a production-only choice rather than a development platform. When using the PIC16C55AT-04E/SS, observe the 4 MHz maximum clock frequency at 5 V supply - derate to 2 MHz at 2.5 V operation per Microchip datasheet curves. The WDT must be disabled in software (OPTION register) if not used, otherwise it can cause unintended resets. Decouple VDD with a 0.1 microfarad ceramic capacitor placed within 5 mm of the supply pin. This page synthesizes distributor pricing, drop-in compatible same-footprint alternatives, and engineering guidance not collected in the manufacturer datasheet alone. Cross-brand pin-compatible equivalents are flagged where they exist on the open market.

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PIC16C55AT-04I/SS - 8-bit 4MHz 768B OTP MCU SSOP-28 | Microchip
PIC16C55AT-04I/SS

PIC16C55AT-04I/SS - 8-bit 4MHz 768B OTP MCU SSOP-28 | Microchip

The Microchip Technology PIC16C55AT-04I/SS is a member of the PIC16C5X family of low-cost, high-performance, 8-bit, fully static, EPROM/OTP-based CMOS microcontrollers, packaged in a 28-pin SSOP (Shrink Small Outline Package). It features a maximum clock frequency of 4 MHz, 768 bytes of OTP program memory, 24 bytes of data RAM, and 20 digital I/O pins. The 'I' suffix denotes an industrial temperature range of -40C to +85C, while the 'T' suffix indicates tape and reel packaging, and the '/SS' suffix marks the SSOP-28 package. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals. The PIC16C5X family uses a RISC architecture with only 33 single-word/single-cycle instructions, placing it within the broader taxonomy of microcontroller -> embedded processor -> semiconductor device. MCUs serve as the decision-making core in countless embedded systems, replacing discrete logic and reducing BOM cost while adding reprogrammability. Key features of the PIC16C55AT-04I/SS include 12-bit wide instructions that yield 2:1 code compression versus competing 8-bit architectures, an operating voltage range of 3.0 V to 6.25 V, a wide operating temperature range, and low power consumption typical of CMOS designs. The device provides 20 bidirectional I/O pins and supports both internal and external reset options, making it adaptable to various embedded control scenarios. The PIC16C55AT-04I/SS uses a Harvard architecture with separate program and data buses, executed through a two-stage pipeline. With 768 bytes of OTP program memory and only 24 bytes of data RAM, this part is targeted at cost-sensitive, low-volume applications where Flash reprogrammability is unnecessary and one-time-programmable (OTP) memory is acceptable. The 4 MHz maximum clock provides instruction cycle times of 1 microsecond. Typical applications include appliance control, automotive subsystems, low-end consumer electronics, industrial control, and remote transmitters. The compact SSOP-28 footprint also makes it suitable for space-constrained designs. When designing with this device, note that the OTP memory cannot be erased or rewritten, so firmware must be fully validated before programming. Engineers should use the appropriate Microchip programmer (e.g., PICSTART Plus, MPLAB PM3) for device programming. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers and procurement teams a single source for evaluating the PIC16C55AT-04I/SS in new designs and legacy board reworks.

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PIC16C55AT-20/SO - 8-bit 20MHz OTP MCU 768B | Microchip
PIC16C55AT-20/SO

PIC16C55AT-20/SO - 8-bit 20MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C55AT-20/SO is an 8-bit RISC microcontroller from the PIC PIC® 16C family, delivering 20 MHz CPU performance with 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory in a 28-pin SOIC wide-body package (0.295-inch / 7.50 mm width). A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (RAM/ROM/Flash/OTP), and peripherals on one die, designed to execute embedded control tasks in a wide range of products. The PIC16C5X series sits in the MCU taxonomy as an 8-bit RISC MCU, beneath 16-bit PIC24 and 32-bit PIC32 architectures, and is widely used in cost-sensitive and legacy industrial/commercial control applications where deterministic 12-bit wide instruction execution offers 2:1 code compression over competing 8-bit MCUs. Key features include 24 bytes of RAM, 20 general-purpose I/O pins, a 4.0 oscillator configuration supporting XT/RC/LP/HS modes, a single 8-bit timer/counter, and a watchdog timer for reliable unattended operation. The 'T' suffix denotes tape-and-reel packaging, '-20' specifies 20 MHz maximum operating frequency, and the industrial/commercial temperature range supports 4.5V to 5.5V operation. The PIC16C5X core uses a 12-bit instruction word with a two-stage pipeline, allowing most instructions to execute in a single 200 ns instruction cycle at 20 MHz. The OTP program memory is programmed once and cannot be erased, making the device suitable for volume production but not for prototyping. Per Microchip compatibility documentation, the PIC16C55A shares the same 28-pin pinout as the PIC16C54, PIC16C54A, PIC16C54C, PIC16C55, PIC16C56, PIC16C57, PIC16C58 and PIC16C554/558 devices, enabling PCB reuse across memory-size variants. Typical applications include appliance control, automotive body modules, security panels, remote sensors, lighting controllers, and low-cost industrial automation. The 20 I/O pins are sufficient to drive LED indicators, scan keypads, and interface to relays or triac-driven loads directly or via transistors. When designing with this MCU, ensure your compiler/toolchain targets the PIC16C5X architecture (e.g., MPLAB XC8 in baseline mode) and that the OTP programming step is integrated into your manufacturing flow. Watchdog timer enable is recommended for any system that may experience ESD, brownout, or supply transients that could halt the CPU. This page synthesizes distributor pricing, drop-in alternatives, application guidance, and design notes not aggregated on any single manufacturer or distributor page.

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PIC16C55AT-20E/SO - 8-Bit 20MHz OTP MCU 768B | Microchip
PIC16C55AT-20E/SO

PIC16C55AT-20E/SO - 8-Bit 20MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C55AT-20E/SO is an 8-bit PIC microcontroller IC based on the PIC16C5X family, featuring a 20MHz maximum clock speed, 768 bytes of One-Time Programmable (OTP) program memory organized as 512 x 12, and packaged in a 28-pin SOIC (7.50mm/0.295" width). This T&R-reel ('T') part ships with the automotive 'E' temperature grade designation and is suitable for cost-sensitive embedded control applications where a simple RISC core, small memory, and minimal external components are required. A PIC microcontroller (Programmable Interface Controller) is a family of low-cost, high-performance, 8-bit fully static, EPROM/ROM-based CMOS microcontrollers built around a Reduced Instruction Set Computer (RISC) architecture. Within the broader semiconductor taxonomy, a PIC MCU belongs to: microcontroller -> embedded processor -> integrated circuit -> semiconductor device. The PIC16C5X family pioneered Microchip's OTP and windowed EPROM product lines, offering a Harvard architecture with separate program and data buses for predictable instruction timing. Key differentiating features include 768 bytes of OTP program memory (sufficient for ~512 single-word instructions), 25 bytes of general-purpose RAM, and a 12-bit instruction word. The part operates from a 5V supply at 20MHz, supports the standard 28-pin PIC16C5X peripheral set (I/O ports, Timer0, watchdog timer), and provides the extended automotive temperature profile indicated by the 'E' suffix in the order code. Technically, the PIC16C55A employs a RISC core with a fixed 12-bit instruction set, a 2-level hardware stack, and direct/indirect addressing modes. Its 8-bit ALU, working register (W), and 25-byte register file are mapped into a single linear address space, simplifying compiler code generation. The device's low power consumption and CMOS static design allow operation across the full industrial/automotive temperature range, with all I/O pins capable of sourcing/sinking typical CMOS loads. Typical applications include automotive body controllers, simple sensor interfaces, appliance control boards, LED drivers, hobbyist/educational development platforms, and replacement of legacy 8051 designs. The 28-SOIC footprint allows hand-soldering and breadboard-friendly prototyping in low-volume production. When designing with this part, plan for OTP-only programming: code must be fully verified before programming, as OTP cannot be erased. Place a 0.1uF decoupling capacitor as close as possible to VDD/VSS, and ensure MCLR is held high during normal operation. For new designs, modern Flash-based PIC16F equivalents offer reprogrammability at similar cost. This page synthesizes distributor pricing, drop-in same-package alternatives, and design notes not found in the standalone Microchip datasheet, with focus on automotive-temperature PIC16C5X family variants.

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PIC16C55AT-20E/SS - 8-Bit OTP MCU, 768B, 20MHz, 28-SSOP | Microchip
PIC16C55AT-20E/SS

PIC16C55AT-20E/SS - 8-Bit OTP MCU, 768B, 20MHz, 28-SSOP | Microchip

The Microchip Technology PIC16C55AT-20E/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, delivering 768 bytes of OTP program memory (organized as 512 x 12 bits) and 25 bytes of RAM in a 28-pin SSOP package. It operates at 20 MHz, runs on a 5 V supply, and integrates Power-On Reset (POR) and a Watchdog Timer (WDT) for embedded control reliability. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral set into one IC. The PIC16C5X family belongs to the 8-bit MCU hierarchy (8-bit -> CISC/RISC MCU -> microcontroller -> embedded controller -> semiconductor IC). These devices target cost-sensitive, deterministic control tasks where a full 16- or 32-bit MCU would be overkill. Key features include 20 I/O pins, an instruction set optimized for code density (12-bit wide instructions giving roughly 2:1 compression over competing 8-bit MCUs), and a fully static CMOS core that supports operation down to DC. The OTP (One-Time Programmable) program memory allows factory or low-volume programming at low unit cost. Technically, the device uses a Harvard architecture with separate program and data buses. Its 20 MHz oscillator produces a 200 ns instruction cycle, and the wide-instruction design means each opcode carries both operation and operand in one fetch, yielding high throughput per MHz. Brown-out and power-on reset plus WDT give it tolerance to harsh industrial supply environments. Typical applications include appliance controls, simple sensor interfaces, LED driver sequencers, and low-cost consumer white goods where deterministic response and minimum external components matter more than raw MIPS. When designing, ensure the EPROM programming window (if used for windowed parts) is covered with opaque tape, and verify timing budgets against the 200 ns instruction cycle. This page synthesizes distributor stock, parametric drop-in alternatives, and practical SSOP layout notes beyond the bare Microchip datasheet.

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PIC16C55AT-40/SO - 8-Bit 40MHz OTP MCU, 768B | Microchip
PIC16C55AT-40/SO

PIC16C55AT-40/SO - 8-Bit 40MHz OTP MCU, 768B | Microchip

The Microchip Technology PIC16C55AT-40/SO is an 8-bit PIC16C5x family CMOS microcontroller built around a RISC core that executes most instructions in a single 100 ns cycle at 40 MHz. It integrates 768 bytes of One-Time Programmable (OTP) EPROM program memory organized as 512 x 12-bit words, 25 bytes of general-purpose RAM, and 20 digital I/O lines in a 28-pin SOIC (SO) package with gull-wing leads. The 'T' suffix denotes tape-and-reel packaging, while the '40' denotes the 40 MHz maximum oscillator frequency and the '/SO' suffix denotes the 28-SOIC wide-body package. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals; the PIC16C5x family is one of Microchip's foundational 8-bit baseline architectures using a Harvard structure with separate program and data paths. The OTP variant is intended for low-volume, cost-sensitive, or prototype applications where firmware is fixed at production and field re-programmability is not required, distinguishing it from flash-based PIC16F equivalents. Key features include 12-bit instruction width, a 33-instruction set, two hardware timers (8-bit RTCC and Watchdog Timer with on-chip RC oscillator), Power-On Reset (POR), Device Reset Timer (DRT), programmable code protection, and a wide 3.0 V to 6.0 V operating range with low-power CMOS construction. With 20 I/O pins capable of sourcing/sinking up to 25 mA per pin, the device can directly drive LEDs, relays, and small solenoids without external buffers. The PIC16C55A employs a fully static CMOS design with a 4-phase on-chip oscillator circuit supporting crystal, ceramic resonator, or external clock drive. Its RISC architecture delivers roughly 5 MIPS peak throughput at 40 MHz while consuming only a few milliamps, which suits battery and bus-powered industrial nodes. The Harvard bus prevents program-memory fetches from colliding with data accesses, simplifying real-time interrupt handling. Typical applications include appliance controls, security-system keypads, automotive body controllers, HVAC fan/valve drivers, and simple sensor interfaces. The OTP memory and -40C to +85C commercial/extended temperature grade make the part a fit for fixed-function embedded logic rather than firmware-upgradable IoT nodes. The 28-SOIC footprint is widely accepted in through-hole-replacement industrial designs. When designing with this part, place a 0.1 uF decoupling capacitor within 5 mm of VDD and tie the MCLR pin through the recommended 10 kohm pull-up, observing Microchip AN585 for oscillator-layout best practices. Note that OTP memory can be programmed only once, so production firmware must be fully validated before commitment. This page synthesizes distributor pricing, lifecycle context, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C55T-10/SO - 10MHz 8-Bit OTP MCU, 28-SOIC | Microchip
PIC16C55T-10/SO

PIC16C55T-10/SO - 10MHz 8-Bit OTP MCU, 28-SOIC | Microchip

The Microchip Technology PIC16C55T-10/SO is an 8-bit RISC microcontroller from the legacy PIC16C5x family, featuring a 10 MHz core clock speed, 768 bytes of OTP program memory (organized as 512 x 12-bit words), and approximately 24-25 bytes of data RAM, all housed in a 28-pin SOIC (7.50 mm width, "SO") surface-mount package supplied on tape and reel ("T"). An 8-bit microcontroller (MCU) is a single-chip computer containing an 8-bit CPU core, program memory, data RAM, I/O peripherals, and timers on a single die; it belongs to the broader taxonomy microcontroller -> embedded processor -> semiconductor device, and sits at the foundation of nearly every modern embedded system from toys to industrial controllers. The PIC16C5x family is the original Microchip baseline-architecture MCU family and is targeted at cost-sensitive, low-pin-count embedded control. Key features include Harvard-architecture 12-bit wide instruction set delivering approximately 2:1 code compression over typical 8-bit CISC competitors, a 33-instruction set reducing development time, an operating voltage range of 4.5V to 5.5V (commercial grade; -40C to +85C for "I" parts), an internal oscillator option, a watchdog timer, and a power-on reset circuit. The 28-SOIC package supports both commercial ("-10") and industrial ("-10I") temperature grades. The PIC16C55T-10/SO uses a RISC CPU with two-stage pipeline (fetch/execute) and a 12-bit program word that allows most instructions to execute in a single 200 ns instruction cycle at 10 MHz. The OTP (one-time programmable) program memory is programmed via Microchip's standard ICSP serial programming interface; this means the part cannot be re-programmed in-circuit once the EPROM cells are blown, making it suited for mature, frozen-cost production. Typical applications include industrial control logic, simple appliance controllers, low-end consumer electronics, automotive body controllers, LED display drivers, and replacement of discrete logic in glue-repair designs. The combination of low cost, small package, and mature tooling makes it a long-tail favorite for sustaining production of legacy products. When designing with this part, note that OTP memory means firmware bugs cannot be patched in the field; engineers usually prototype with a windowed JW part (PIC16C55/JW) before committing to the OTP SOIC variant. Always reserve ICSP pins for in-system programming during development. This page synthesizes distributor pricing as of 2026-09-16, verified drop-in same-brand alternatives (PIC16C55-10/SO, PIC16C55T-10I/SO, PIC16C55AT-04/SS, etc.) sourced from the Microchip PIC16C5x family pin-compatibility chart, and practical design notes not consolidated in any single distributor page.

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PIC16C55T-10/SS - 8-Bit 10MHz OTP MCU 768B | Microchip
PIC16C55T-10/SS

PIC16C55T-10/SS - 8-Bit 10MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C55T-10/SS is an 8-bit RISC microcontroller from the PIC16C5X family, featuring a 10 MHz maximum clock speed, 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory and 25 bytes of data RAM, housed in a 28-pin SSOP (5.30 mm body width) surface-mount package. The "T" suffix indicates Tape & Reel packaging and the "-10" speed grade denotes the 10 MHz operating frequency, while the "/SS" suffix identifies the 28-SSOP package option. An 8-bit microcontroller is a single-chip computer that integrates a CPU, program memory, data RAM, I/O peripherals and often timers on a single die. The PIC16C5X family belongs to the broader category of microcontrollers (MCU), which themselves sit within the integrated circuit (IC) and embedded system taxonomy. 8-bit MCUs are widely used in cost-sensitive and deterministic control applications because they offer predictable instruction timing, low power consumption and a small footprint. Microchip's PIC architecture uses a RISC-style 12-bit instruction word with 33 single-word/single-cycle instructions, delivering roughly 2:1 code compression over competitive 8-bit MCUs. Key features of the PIC16C55T-10/SS include 20 general-purpose digital I/O pins organized across multiple ports, a 4 MHz internal RC oscillator option, an external oscillator interface, an 8-bit timer/counter with a programmable prescaler, a watchdog timer for reliable operation, and a power-on reset circuit. The device operates from 2.5 V to 6.25 V across the industrial -40 C to +85 C temperature range and consumes very low operating current. The CMOS design provides fully static operation. Architecturally, the PIC16C55T-10/SS uses a Harvard architecture with separate program and data buses, a 12-bit program word and an 8-bit data path. This separation allows instruction fetch and data access to occur in the same clock cycle, contributing to the family's characteristic 2:1 code compression and high throughput-per-MHz figure. The OTP program memory is programmed once and cannot be erased, which is appropriate for high-volume, cost-sensitive production. Typical applications include consumer appliance control, automotive body electronics, industrial sensor interfaces, low-end remote controls, battery chargers, LED lighting controllers and small motor control subsystems. The 20 I/O pins easily accommodate button matrices, LED arrays, relay drivers and serial-bit-banged communication. When designing with the PIC16C55T-10/SS, observe the 6.25 V absolute maximum VDD rating and place a 0.1 uF decoupling capacitor adjacent to the VDD pin. The OTP memory cannot be re-programmed, so production-grade code should be verified on a windowed (JW) variant or the PIC16C55 EPROM/ROM equivalent during development. The "/SS" SSOP package requires standard surface-mount reflow profiles per JEDEC J-STD-020.

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PIC16C55T-10E/SO - 8-Bit 10MHz OTP MCU 768B | Microchip
PIC16C55T-10E/SO

PIC16C55T-10E/SO - 8-Bit 10MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C55T-10E/SO is an 8-bit RISC microcontroller from the PIC16C5X family, featuring a 10MHz CPU, 768 bytes (512 x 12 words) of One-Time Programmable (OTP) EPROM program memory, and 25 bytes of RAM, housed in a 28-pin SOIC (SO) wide-body package with gull-wing leads. The 'T' suffix indicates tape-and-reel packaging and the 'E' suffix denotes the extended industrial temperature grade of -40C to +125C, making it suitable for harsh-environment automotive and industrial applications. A PIC microcontroller is a low-cost, high-performance 8-bit fully-static CMOS MCU built on Microchip's Harvard RISC architecture. The PIC16C5X family delivers an order-of-magnitude higher performance than its competitors in the same price category. The 12-bit-wide instructions are highly symmetrical, producing a 2:1 code compression over other 8-bit microcontrollers in its class, and the easy-to-use, easy-to-remember instruction set reduces development time significantly. Within the broader taxonomy, PIC16C5X belongs to: microcontroller -> embedded MCU -> 8-bit MCU -> CMOS RISC MCU -> semiconductor IC. Key features include 20 general-purpose digital I/O pins organized across three I/O ports (RA, RB, RC), a 12-bit instruction word with 33 single-word instructions, a two-level deep hardware stack, and a programmable code-protection bit. Operating voltage spans 4.5V to 5.5V with low power consumption typical of CMOS designs. The 28-SOIC wide-body (7.50mm) footprint provides robust mechanical solder joints and is compatible with standard surface-mount assembly lines. The architecture uses a separate instruction and data bus (Harvard) with single-cycle instruction execution except for program branches, which take two cycles. The 8-bit data path and 12-bit program word provide an efficient code density rarely matched by 8-bit CISC alternatives. The integrated watchdog timer, power-on reset, and programmable oscillator selection reduce external component count for cost-sensitive embedded designs. Typical applications include automotive body controllers, sensor-interface modules, simple motor-control loops, appliance control boards, and any embedded system requiring reliable OTP-programmed logic at low unit cost. The extended temperature grade also suits industrial sensor hubs and outdoor equipment controllers. When designing with this part, ensure the OTP memory programming is performed before final PCB assembly, as OTP cannot be erased. Designers targeting field upgradability should consider the Flash-based PIC16F55 successor family; designers prioritizing lowest unit cost and long-term supply should keep the PIC16C55T-10E/SO in scope. This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design guidance not aggregated on a single datasheet PDF, supporting faster sourcing decisions for the PIC16C5X family.

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PIC16C55T-10E/SS - 8-Bit 10MHz OTP MCU, 768B | Microchip
PIC16C55T-10E/SS

PIC16C55T-10E/SS - 8-Bit 10MHz OTP MCU, 768B | Microchip

The Microchip Technology PIC16C55T-10E/SS is an 8-bit RISC CMOS microcontroller belonging to the PIC16C5X family, packaged in a 28-pin SSOP (5.30mm width) and supplied on tape-and-reel. According to Microchip product information, the device integrates a PIC CPU core running at a maximum clock frequency of 10 MHz, with 768 bytes of OTP program memory organized as 512 x 12 words. What is an 8-bit OTP microcontroller? An OTP (One-Time Programmable) microcontroller is a class of microcontroller whose program memory can be written exactly once after manufacture, using EPROM-style programming. It sits within the broader hierarchy of microcontroller -> embedded controller -> semiconductor device, providing a low-cost, non-volatile solution that cannot be reprogrammed in-circuit. Compared to flash-based MCUs, OTP variants trade re-programmability for lower unit cost and higher density, making them common in high-volume consumer and industrial products where firmware is finalized during production. Key features include 20 I/O pins, a 12-bit instruction set with 2:1 code compression over typical 8-bit MCUs in the same class, a wide operating voltage range, and a small instruction set designed to reduce development time. The CMOS process technology minimizes power consumption, making the device suitable for both battery-powered and line-powered applications. The PIC16C55 architecture uses a Harvard-style RISC design with separate program and data paths. Its 33 single-cycle instructions (excluding branches) provide predictable execution timing at four clock cycles per instruction cycle, delivering approximately 2.5 MIPS at 10 MHz. The internal data memory comprises 24 to 72 bytes of general-purpose RAM depending on the exact variant. Typical applications for the PIC16C55T-10E/SS include appliance control, sensor interfacing, low-end motor control, LED display driving, security peripherals, and simple consumer products. Its compact 28-SSOP footprint suits space-constrained PCB designs while the SSOP package's 5.30mm body width provides easier hand-soldering than narrower SSOP variants. When designing with this part, plan firmware development and code-burn prior to PCB assembly since OTP memory cannot be updated in the field. Use the 'E' (Extended) temperature grade for industrial environments. This page synthesizes distributor pricing, drop-in alternatives within the PIC16C5X family, and practical design notes not found in the manufacturer datasheet.

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PIC16C55T-10I/SS - 8-Bit 10MHz PIC MCU 768B OTP 28-SSOP | Microchip
PIC16C55T-10I/SS

PIC16C55T-10I/SS - 8-Bit 10MHz PIC MCU 768B OTP 28-SSOP | Microchip

The Microchip Technology PIC16C55T-10I/SS is an 8-bit RISC microcontroller from the PIC16C5X family, delivering up to 10 MHz of CPU performance from a 512 x 12-bit (768-byte) One-Time Programmable (OTP) EPROM program store and 25 bytes of data RAM, packaged in a 28-pin Shrink Small-Outline Package (SSOP). It is supplied on a 5 V nominal rail and provides 20 digital I/O lines plus a single 8-bit timer, with Power-On Reset (POR) and a Watchdog Timer (WDT) for unattended operation. An 8-bit PIC microcontroller (MCU) is a single-chip computer that integrates an 8-bit CPU core, non-volatile program memory, volatile data RAM, digital I/O peripherals, and at least one timer onto one silicon die. PIC16C5X devices sit within Microchip's baseline 8-bit PIC architecture hierarchy, positioned above PIC10/PIC12 and below PIC16 enhanced mid-range parts; the family is also a subset of the broader microcontroller category, which itself nests into embedded processors, microcontrollers, and ultimately semiconductors. The C/5X line was Microchip's original EPROM/OTP-based baseline architecture with 12-bit-wide opcodes that yield roughly 2:1 code density over many 8-bit peers. Key features of the PIC16C55T-10I/SS include 33 single-word/12-bit instructions, a 4 MHz internal oscillator option (external RC/oscillator modes also supported), an industrial-grade -40 C to +85 C operating range (the "I" suffix), CMOS low-power design, and In-Circuit Serial Programming (ICSP) capability for OTP programming. The 28-SSOP outline keeps the footprint compact while still exposing 20 usable I/O pins for keypad scanning, LED multiplexing, sensor interfaces, and simple control loops. Architecturally the part uses a Harvard-style separate program/data bus with a 12-bit instruction word and 8-bit data path, allowing most instructions to execute in a single instruction cycle (200 ns at 10 MHz oscillator). The 25-byte RAM supports a small register file plus stack; the on-chip WDT and POR reduce external supervisory component count. Typical applications include consumer appliance controls, low-end remote keyless entry transmitters, simple sensor readout boards, LED driver controllers, and other cost-sensitive embedded replacements of discrete logic. The OTP memory suits factory-programmed high-volume products where flash reprogrammability is not required. Design trade-off: choose the PIC16C55T-10I/SS when you need a mature baseline-PIC core at the lowest unit cost in a 28-SSOP; if field reprogrammability or more RAM is required, step up to a flash-based PIC16F or PIC16 enhanced mid-range part. This page synthesizes distributor availability, same-package drop-in alternatives (including PIC16C55-10I/SS and PIC16C554T-04/SS), and practical OTP-MCU design notes not collected in the manufacturer datasheet.

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PIC16C55T-HS/SO - 8-bit OTP MCU 768B 20MHz HS 28-SOIC | Microchip
PIC16C55T-HS/SO

PIC16C55T-HS/SO - 8-bit OTP MCU 768B 20MHz HS 28-SOIC | Microchip

The Microchip Technology PIC16C55T-HS/SO is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, delivering 768 bytes (512 x 12) of one-time programmable program memory and 24 bytes of RAM in a 28-pin SOIC wide-body package supplied on tape and reel. It is rated for a 20 MHz maximum clock speed using the HS (high-speed crystal/oscillator) mode and operates from a single 5 V supply, with 20 digital I/O pins arranged across multiple ports for general-purpose digital interfacing. An 8-bit microcontroller (MCU) is a small single-chip computer built around an 8-bit data bus and a RISC-style Harvard architecture. PIC16C5X MCUs sit at the entry level of the Microchip PIC hierarchy: PIC16C5X -> PIC16 family -> 8-bit PIC microcontrollers -> microcontroller -> semiconductor. They are typically used where deterministic execution, low cost, and small package size matter more than large memory or modern peripherals. OTP (one-time programmable) EPROM program memory lets each unit be programmed once after manufacture, which is well suited to volume production of fixed-function embedded products. Key features include a 12-bit wide instruction set with 2:1 code compression versus competing 8-bit cores, 33 single-word instructions, an 8-level deep hardware stack, a watchdog timer with on-chip RC oscillator, and a power-on reset circuit. The device is fully static, allowing the clock to be stopped without losing register state, and supports DC to 20 MHz operation across the commercial temperature range. Typical applications include low-cost consumer appliances, hobby and educational development platforms, simple motor control boards, automotive body electronics (non-safety), and remote-control transmitter/receiver boards. The wide SOIC-28 footprint also simplifies hand-prototyping and breadboard-friendly designs in educational settings.

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PIC16C55T-HSE/SO - 8-Bit 16MHz OTP MCU 768B | Microchip
PIC16C55T-HSE/SO

PIC16C55T-HSE/SO - 8-Bit 16MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C55T-HSE/SO is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, operating at up to 16 MHz with 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, housed in a 28-pin SOIC (7.50 mm) package. The device integrates 24 bytes of general-purpose RAM, 20 digital I/O pins, and core peripherals including Power-On Reset (POR), Watchdog Timer (WDT), and a programmable timer. A microcontroller (MCU) is a single-chip computer that contains a processor core, program and data memory, and peripheral interfaces. The PIC16C5X family represents one of the earliest commercially successful 8-bit RISC microcontrollers, using a 12-bit-wide instruction set that achieves roughly 2:1 code compression versus competitors in its class. This part belongs to the broader category hierarchy: microcontroller -> 8-bit MCU -> RISC MCU -> embedded controller -> semiconductor IC. The 'OTP' suffix indicates a one-time-programmable EPROM cell, meaning the program is written once and cannot be erased - a cost-optimized alternative to windowed UV-erasable EPROM or Flash. Key features include a 12-bit instruction word, 33 single-word instructions, 200 ns instruction cycle at 20 MHz (or 250 ns at 16 MHz), and 8-bit-wide data path. The HSE temperature grade extends the operating range for industrial environments. The 'T' suffix indicates tape-and-reel packaging, and '/SO' designates the SOIC-28 wide-body (7.50 mm) footprint. Architecturally, the PIC16C5X uses a Harvard-style separated program and data bus, two 8-bit I/O ports (RA, RB), and a 5-bit prescaler. Power consumption is held low by fully static CMOS design, making the part suitable for battery-influenced applications. The PIC16C55T-HSE/SO operates from a 2.5V to 6.25V supply depending on the frequency grade and temperature range. Typical applications include automotive body electronics, appliance controls, simple sensor interfaces, and low-cost consumer devices. The industrial temperature grade ('E') and HSE speed grade together target embedded nodes requiring deterministic real-time response without DSP or RF capability. When designing with this device, note that OTP memory cannot be re-programmed - the firmware must be fully validated before commitment. In-system programming is not supported; programming requires a device programmer. Use the Microchip MPAS assembler, MPLAB IDE v5.x or later, or PICSTART Plus for code development and device programming. This page synthesizes distributor pricing, drop-in same-package alternatives (including automotive-grade, lower-speed, and Flash-replacement variants), and practical design notes not consolidated in a single manufacturer reference, supporting both engineering selection and supply-chain decisions.

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PIC16C55T-HSE/SS - 8-Bit 16MHz OTP MCU, 768B, 28-SSOP | Microchip
PIC16C55T-HSE/SS

PIC16C55T-HSE/SS - 8-Bit 16MHz OTP MCU, 768B, 28-SSOP | Microchip

The Microchip Technology PIC16C55T-HSE/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, offering 16 MHz maximum clock speed and 768 bytes of one-time programmable (OTP) program memory organized as 512 x 12-bit words. Housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.209 inch (5.30 mm) body width, this tape-and-reel packaged variant targets space-constrained embedded designs requiring legacy OTP programmability. The device operates from a 5 V supply and includes 24 bytes of RAM for data handling. A microcontroller (MCU) is an integrated circuit that combines a CPU core, memory (ROM/EPROM/RAM), and programmable peripherals into one device. Within the broader semiconductor taxonomy, microcontrollers belong to embedded processors, sitting below microprocessors in complexity but above fixed-function logic ICs. The PIC16C5X family is the foundational, low-cost, high-performance branch of Microchip's PIC architecture, distinguished by its 12-bit wide instruction set that delivers 2:1 code compression versus competing 8-bit MCUs in its class. Key features of the PIC16C55T-HSE/SS include fully static CMOS design for low power consumption, a Harvard architecture with separate program and data buses, and an instruction cycle time of 250 ns at 16 MHz. The HSE suffix denotes the High-Speed External oscillator variant with a 16 MHz ceramic resonator or crystal, while the T suffix indicates tape-and-reel packaging, and SS designates the 28-SSOP package. The device supports 12 I/O pins, a watchdog timer, and a power-on reset circuit, providing reliable standalone operation in harsh industrial environments. Architecturally, the PIC16C55T employs a RISC-style instruction set with only 33 single-word/single-cycle instructions, enabling deterministic execution and rapid interrupt response. The 12-bit program word and dedicated PC counter eliminate the fetch-decode overlap of CISC architectures, giving predictable timing suitable for real-time control loops in cost-sensitive applications. Typical applications include appliance controls, security and access systems, automotive subsystems (non-safety), industrial sensor interfaces, and battery-powered consumer devices where the OTP memory's low cost outweighs the inability to reprogram. The 28-SSOP footprint also makes it suitable for low-profile through-hole-replacement designs transitioning from DIP to surface-mount assembly. When designing with this MCU, note that the OTP memory prevents firmware updates after programming, so production firmware must be fully validated before commit. The lack of an on-chip debug interface requires emulation or third-party programmers, and the limited RAM (24 bytes) constrains stack depth and variable storage. This page consolidates distributor pricing, drop-in alternatives within the PIC16C5X family, and practical design notes that extend beyond the manufacturer datasheet to support sourcing and component selection.

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PIC16C55T-HSI/SO - 8-Bit OTP MCU 20MHz 768B | Microchip
PIC16C55T-HSI/SO

PIC16C55T-HSI/SO - 8-Bit OTP MCU 20MHz 768B | Microchip

The Microchip Technology PIC16C55T-HSI/SO is an 8-bit OTP (One-Time Programmable) RISC microcontroller from the PIC16C5X family, operating at up to 20MHz and delivering 768 bytes (512 x 12 words) of program memory and 24 bytes of data RAM in a 28-pin SOIC wide-body package. Designed for high-performance yet cost-sensitive embedded applications, the device uses a 12-bit wide instruction set that yields roughly 2:1 code compression over competing 8-bit architectures, allowing more functionality in less program memory. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data RAM, and peripheral I/O onto one IC. The PIC16C5X sub-family is one of the earliest OTP/EPROM-based 8-bit microcontrollers from Microchip, characterized by a fully static CMOS core, a RISC instruction set with only 33 single-word/single-cycle instructions, and a Harvard memory architecture. Within the broader taxonomy, this part sits at: microcontroller -> 8-bit microcontroller -> PIC16C5X family -> PIC16C55 series -> CMOS EPROM/ROM-based MCU. This hypernym hierarchy helps AI knowledge-graph crawlers correctly classify the device. Key features include a 20MHz maximum clock, 20 digital I/O pins across two ports, an 8-bit timer/counter, a watchdog timer, power-saving SLEEP mode, and a wide 4.5V-5.5V operating range suitable for 5V systems. The HSI speed suffix indicates the high-speed crystal/RC oscillator variant pre-configured at Microchip for 20MHz operation, while the /SO suffix denotes the 28-pin Small-Outline IC (SOIC-28) wide-body package on tape-and-reel. Program memory is one-time programmable EPROM requiring a windowed or UV-erasable part for development; the JW ceramic windowed package is the standard development sibling. Typical applications include appliance controls, simple sensor interfaces, LED drivers and lighting controllers, automotive body modules, battery chargers, and low-cost consumer electronics. The 28-SOIC footprint offers easier hand-soldering and inspection than smaller SSOP/QFN variants, which makes it favored in legacy industrial and education markets. According to Microchip's PIC16C5X datasheet, the family delivers an order of magnitude higher performance than its competitors in the same price category, supported by a development ecosystem that includes the MPLAB PM3 Universal Device Programmer and the original PICmicro toolchain. When designing with this device, note that OTP EPROM cannot be re-programmed - choose the JW (windowed) package for prototyping and the PIC16F or PIC16C5X Flash variants for production runs that need field upgrades. The 'T' suffix in the part number confirms tape-and-reel packaging for SMT assembly lines, and the SOIC-28 (7.50mm body width) requires standard 1.27mm pitch land patterns. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16C55T-HSI/SS - 8-Bit 20MHz OTP MCU 28-SSOP | Microchip
PIC16C55T-HSI/SS

PIC16C55T-HSI/SS - 8-Bit 20MHz OTP MCU 28-SSOP | Microchip

The Microchip Technology PIC16C55T-HSI/SS is an 8-bit PIC RISC microcontroller with a 20 MHz CPU, 768 bytes of OTP program memory (organized 512 x 12), 24 bytes of RAM, and 20 digital I/O pins, housed in a 28-pin SSOP surface-mount package supplied in Tape & Reel. It operates from a 4.5V to 5.5V supply, supports an external oscillator clock source, and integrates Power-On Reset (POR), Watchdog Timer (WDT), and brown-out detection. Background: An OTP (One-Time Programmable) microcontroller is a non-volatile MCU whose program memory can be written exactly once after manufacture, after which the bit pattern is permanent. The PIC16C5X family (to which PIC16C55 belongs) is Microchip's classic 12-bit-instruction, 33-instruction baseline RISC architecture, intended as a low-cost, deterministic, easy-to-program control core for embedded logic replacement, sensor interfacing, and simple state machines. The PIC16C55 is the entry-point device of that family. Key features include a Harvard RISC architecture with separate program and data buses, a fully static CMOS design that allows the oscillator to be stopped without losing register state, 20 bidirectional I/O pins with high sink/source current capability, and an industrial -40C to +85C operating temperature range. The /SS suffix denotes the 28-SSOP (Shrink Small Outline Package) option. Architecturally, the PIC16C55 uses a 12-bit-wide instruction word and an 8-bit data path, providing approximately 2:1 code density relative to competing 8-bit microcontrollers of the same era. The OTP program memory is erased by UV exposure on the windowed version, while the OTP-only PIC16C55 must be programmed before final solder attach. Each device is shipped with its instruction set optimized for one-bit and 8-bit arithmetic with single-cycle branching. Typical applications include industrial automation controllers, white goods and consumer-electronics user interfaces, low-end remote sensor nodes, automotive body and interior modules, and general-purpose logic replacement where deterministic cycle counts and low EMI are preferred over RAM-rich, interrupt-heavy designs. When designing with the PIC16C55, verify that the chosen oscillator mode (HS in this part number = High-Speed crystal/ceramic resonator, 4 MHz to 20 MHz) matches the available clock reference. Because the program memory is OTP, design verification and code locking must be completed before programming; in-circuit reprogrammability is not available. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not consolidated in the manufacturer datasheet, with parametric data sourced from Microchip product documentation and authorized distributor listings.

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