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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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PIC16C55T-LPE/SO - 8-Bit 40MHz OTP MCU, 768B, 28-SOIC | Microchip
PIC16C55T-LPE/SO

PIC16C55T-LPE/SO - 8-Bit 40MHz OTP MCU, 768B, 28-SOIC | Microchip

The Microchip Technology PIC16C55T-LPE/SO is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5x family, featuring 768 bytes of OTP program memory (512 x 12-bit words) and 24 bytes of RAM in a 28-pin SOIC (SO) wide-body surface-mount package. An 8-bit microcontroller is a small computer-on-a-chip that integrates a CPU, memory, and peripherals into a single IC. The PIC16C5x architecture (microcontroller -> embedded controller -> microcontroller -> semiconductor IC) uses a 12-bit-wide instruction set with a RISC-style two-stage pipeline, which historically delivered roughly 2:1 code compression over competing 8-bit controllers in its class, allowing more application functionality in the small 768-byte program space. Key features include a maximum clock speed of 40 MHz, 20 digital I/O pins, an operating voltage range of 2.5 V to 6.0 V, and an extended industrial operating temperature range of -40 °C to +125 °C (LPE suffix = extended temp, low power). The device includes a watchdog timer, power-on reset, and on-chip RC oscillator options, all in a 28-SOIC wide-body package suitable for hand-soldering or standard SMT lines. The PIC16C55T-LPE/SO is implemented in CMOS technology and belongs to Microchip's original PIC16C5x baseline family, predating the flash-based PIC16F line. The 'C' denotes the OTP/EPROM program-memory variant, 'T' indicates tape-and-reel packaging, and the SO suffix is the 28-SOIC 7.50 mm wide-body pinout. Note that PIC16C5x devices are One-Time-Programmable (windowless for production parts), making them suitable primarily for mature, finalized production designs rather than in-field firmware updates. Typical applications include low-cost industrial control, appliance controls, sensor interfaces, automotive body controllers (non-safety), simple smart sensors, and consumer-electronic subsystems where deterministic 8-bit performance, low cost, and extended temperature tolerance are required. When designing with this part, ensure the chosen oscillator mode and configuration bits match the application's timing and watchdog requirements; PIC16C5x configuration is fuse-based and must be specified at ordering. For new designs, Microchip generally recommends flash-based PIC16F equivalents unless OTP cost or radiation tolerance is required. This page synthesizes distributor pricing, drop-in compatible same-brand alternatives, and practical design considerations not consolidated on a single manufacturer page.

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PIC16C55T-LPE/SS - 8-bit 40MHz OTP MCU 768B | Microchip
PIC16C55T-LPE/SS

PIC16C55T-LPE/SS - 8-bit 40MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C55T-LPE/SS is an 8-bit CMOS OTP (One-Time Programmable) microcontroller in the PIC16C5x family, housed in a 28-pin SSOP package. It operates at up to 40 MHz clock speed, integrates 768 bytes of OTP program memory (organized as 512 x 12-bit instructions), 24 bytes of RAM, and 20 general-purpose digital I/O pins. The device is specified for the extended industrial temperature range (LPE = low-power, extended temperature). According to the manufacturer datasheet, the part features a RISC architecture with 33 single-word/single-cycle instructions, providing typically a 2:1 code compression over competing 8-bit microcontrollers. Core peripherals include a Watchdog Timer (WDT) for safe operation, Power-On Reset (POR) for clean startup, and an external oscillator interface supporting common crystal and resonator topologies. An OTP microcontroller is a class of one-time-programmable MCU whose program memory can be written only a single time after manufacture, using an external programmer. Unlike Flash-based MCUs (which allow thousands of rewrite cycles), OTP parts are intended for cost-sensitive, high-volume, fixed-program applications where field reprogramming is not required. OTP MCUs occupy a distinct position within the broader microcontroller hierarchy: microcontroller -> embedded controller -> single-chip computer -> semiconductor. The PIC16C5x family was Microchip's earliest low-cost OTP line, and it remains in production for long-life industrial and appliance designs that were qualified decades ago. The PIC16C55T-LPE/SS differentiates itself with a static CMOS core that supports DC to 40 MHz operation, allowing designers to halt the clock for low-power standby. It exposes 20 digital I/O pins, all mapped to bidirectional ports, and includes on-chip power management suitable for battery and line-powered appliances. Programming is performed via Microchip's standard in-circuit serial programming protocol using only two pins (RB6/RB7), which simplifies prototyping and production flows. Typical applications for the PIC16C55T-LPE/SS include appliance controllers, automotive body modules, industrial sensor interfaces, smart meters, and remote-control transmitters. Its wide operating voltage range and industrial temperature grade make it well suited to harsh environments. When designing with this device, engineers should reserve a programming header for RB6/RB7 and ensure the configuration word is set correctly for the chosen oscillator mode. The OTP memory cannot be erased, so production firmware must be fully validated on a flash-equivalent development part before committing the final code image.

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PIC16C55T-LPI/SO - 8-Bit OTP MCU, 40MHz, 768B | Microchip
PIC16C55T-LPI/SO

PIC16C55T-LPI/SO - 8-Bit OTP MCU, 40MHz, 768B | Microchip

The Microchip Technology PIC16C55T-LPI/SO is an 8-bit RISC microcontroller from the legacy PIC16C5x family, featuring 768 bytes of One-Time Programmable (OTP) program memory (512 × 12 EPROM) and 24 bytes of RAM in a 28-pin SOIC wide-body package supplied on tape and reel. The device integrates a 40 MHz oscillator with a 4-clock-per-instruction pipeline and supports both 3.3 V and 5 V operation, while exposing 20 digital I/O lines, an 8-bit timer/counter, a Watchdog Timer (WDT), Power-on Reset (POR), and brown-out detection. The narrow (12-bit) instruction set delivers roughly 2:1 code density over competing 8-bit cores in the same price class, easing firmware storage in cost-sensitive OTP designs. A microcontroller is a single-chip computer that integrates a CPU, program and data memory, I/O peripherals, and clock generation onto one silicon die. The 8-bit MCU category sits below 16-bit and 32-bit controllers in raw compute power but offers the lowest cost, the simplest toolchain, and the most mature compilers and emulators, which is why it dominates low-end embedded applications such as appliance controls, sensor interfaces, and battery-powered timing products. Within that hierarchy, PIC16C5x parts are the original EPROM-based baseline family: PIC is the architecture, 8-bit is the data width, OTP EPROM is the program memory technology, and RISC is the Harvard pipeline philosophy. Key specifications distinguishing this part include its 12-bit instruction word (vs. 14-bit for PIC16Cxx midrange and 16-bit for PIC17Cxx/18F), an instruction execution time of one oscillator cycle (i.e. 100 ns at 40 MHz), low-power LP oscillator support, and 25 mA source/sink per I/O pin which allows it to drive LEDs and small relays directly. Industrial temperature range is -40 °C to +85 °C, and the device is offered as RoHS-compliant lead-free with matte-tin plating on the SOIC wide-body package. Typical applications include low-cost consumer appliance controllers, simple battery chargers, fan/lighting controls, and any application that needs a proven, field-tested 8-bit core with small program memory, robust I/O drive strength, and very long product lifecycle support from Microchip. Because the part uses windowless OTP, it is best suited to mature production designs where field firmware updates are not required. Design considerations: ensure the POR rise-time and Vdd decoupling follow Microchip's PIC16C5x recommendations to guarantee clean startup, and select the RC vs. LP vs. XT vs. HS oscillator mode suffix when ordering. This part carries the LP (low-power) and I (industrial temperature) suffixes and ships in SO wide-body (SO) on 1,000-piece tape-and-reel.

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PIC16C55T-LPI/SS - 8-Bit 40MHz OTP MCU 28-SSOP | Microchip
PIC16C55T-LPI/SS

PIC16C55T-LPI/SS - 8-Bit 40MHz OTP MCU 28-SSOP | Microchip

The Microchip Technology PIC16C55T-LPI/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC® 16C family, delivering 40 MHz core speed with 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory and 24 bytes of RAM in a 28-pin SSOP package. The "T" suffix denotes tape-and-reel packaging and the "LPI" code indicates the industrial temperature grade (LP) and low-power CMOS process. With 20 programmable I/O pins, an integrated Power-On Reset (POR) circuit, and a Watchdog Timer (WDT), the PIC16C55T targets cost-sensitive embedded control tasks that require deterministic RISC performance. The PIC® 16C microcontroller family uses a Harvard-architecture RISC CPU with a reduced 33-instruction set and 12-bit-wide instructions that deliver 2:1 code compression over competing 8-bit architectures in the same price tier. The "PIC" acronym (Peripheral Interface Controller) reflects its origins as a peripheral interface IC, and the family has become a foundational building block in embedded systems. The PIC16C5X series sits at the entry-level of the PIC16 hierarchy, offering fully static operation, low power consumption, and OTP-based code storage for low-volume production runs. Key features include 20 bidirectional digital I/O pins, on-chip Power-On Reset to initialize the device cleanly at power-up, a Watchdog Timer for runaway code recovery, and an integrated oscillator with selectable clock modes (RC, LP, XT, HS) for design flexibility. The 28-SSOP package (5.30 mm body width, 0.65 mm pitch) provides a compact footprint suitable for space-constrained PCB layouts while maintaining compatibility with standard reflow processes. Operating voltage spans 2.5V to 6.0V, enabling compatibility with both 3.3V and 5V logic rails. Typical applications include low-cost consumer appliances, automotive body controllers, industrial sensor interfaces, white-goods motor control, and battery-powered instruments where small code footprint and deterministic execution are paramount. The PIC16C55T's mature toolchain (MPLAB, MPASM) and broad third-party support make it well suited for legacy designs and maintenance of installed-base products. When designing with this device, allocate adequate decoupling (100 nF ceramic adjacent to VDD/VSS) and consider the OTP programming requirement - code must be committed during manufacturing, so development flows typically use a flash-based PIC16F5X sibling during prototyping. Pin 1 dot orientation must be verified against the SSOP notch mark during board layout. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, enabling faster component evaluation and PCB reuse decisions.

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PIC16C55T-RC/SO - 4MHz 8-bit OTP MCU 28-SOIC | Microchip
PIC16C55T-RC/SO

PIC16C55T-RC/SO - 4MHz 8-bit OTP MCU 28-SOIC | Microchip

The Microchip PIC16C55T-RC/SO is an 8-bit, fully-static RISC microcontroller from the PIC16C5x family, supplied in a 28-pin SOIC (7.50 mm / 0.295" width) package on tape and reel. The device integrates 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, 24 bytes of data RAM, and 20 digital I/O pins, and executes instructions at a 4 MHz oscillator rate. It operates from a 3.0 V to 6.25 V supply and is qualified for the commercial 0C to +70C temperature range. A microcontroller (MCU) is a single-chip computer that combines a CPU, memory, and programmable I/O peripherals. The PIC16C5x family is built on a RISC core using 33 single-word single-cycle instructions and 12-bit-wide opcodes, delivering roughly 2:1 code density advantage over competing 8-bit architectures at the time. Within the power-management IC taxonomy, MCUs sit one level above logic and below system-level SoCs, serving as the decision-making element in embedded products. Key features include Power-On Reset (POR), a Watchdog Timer (WDT) for reliable unattended operation, an internal oscillator option, and code protection for the OTP array. The Harvard-bus architecture separates program and data paths, allowing instruction fetch and operand access in the same clock cycle, which gives deterministic execution timing for real-time control loops. The 20 I/O pins can be individually configured for digital input or output, with weak pull-ups and pin-change interrupts. The 8-bit timer (TMR0) with a programmable prescaler supports event counting, delay generation, and periodic interrupts. The brown-out reset, sleep-mode current (low-power halt), and EPROM/OTP-based code storage make the part suitable for high-volume cost-sensitive products. Typical applications include consumer appliances, simple industrial controllers, automotive subsystems (non-safety), white goods user interfaces, remote controls, and sensor conditioning front-ends. The PIC16C55 family is widely deployed as a glue-replacement for discrete logic in legacy designs. When designing with this part, allocate at least one full instruction-cycle budget to interrupt latency and verify the 4 MHz RC oscillator accuracy against timing-critical peripherals such as UART or PWM outputs. The T suffix and /SO suffix denote tape-and-reel packaging in the 28-SOIC form factor.

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PIC16C55T-RC/SS - 8-Bit 4MHz OTP MCU, 768B | Microchip
PIC16C55T-RC/SS

PIC16C55T-RC/SS - 8-Bit 4MHz OTP MCU, 768B | Microchip

The Microchip Technology PIC16C55T-RC/SS is an 8-bit PIC® 16C microcontroller running at 4MHz with 768 bytes (512 x 12) of One-Time-Programmable (OTP) EPROM program memory and 24 bytes of general-purpose RAM, supplied in a 28-pin SSOP package. Designed for cost-sensitive embedded applications, it belongs to Microchip's legacy PIC16C5x family of fully static EPROM/ROM-based CMOS microcontrollers. The 'T' suffix indicates Tape & Reel packaging, 'RC' indicates the 4MHz oscillator mode, and 'SS' identifies the 28-SSOP form factor. An OTP microcontroller (One-Time-Programmable) is a class of MCU that allows the user to electrically program the on-chip program memory exactly once; the bit cells use anti-fuse or fuse-link technology that cannot be erased by UV or electrical means. OTP MCUs sit in the same hierarchy as EPROM-windowed MCUs (erasable via UV light) and Flash MCUs (re-programmable many times). The PIC16C5x family specifically uses 12-bit-wide instructions, achieving a 2:1 code compression ratio over competing 8-bit architectures in its class, which reduces overall program memory footprint. Key features include 20 bidirectional digital I/O pins, two 8-bit timer/counters, a watchdog timer, and a 4MHz maximum operating frequency with an instruction cycle time of 1µs. The wide supply voltage range of 4.5V to 5.5V supports industrial and consumer 5V rails. The PIC RISC core executes most instructions in a single cycle, delivering high throughput for the device class. Technically, the PIC16C5x architecture employs a Harvard design with separate program and data buses, and 32 bytes of register-based RAM mapped as general-purpose and special-function registers. The device is fabricated in CMOS technology, offering low power consumption suitable for battery and line-powered applications. The 28-SSOP package exposes 20 usable I/O lines via two 8-bit ports plus partial port bits. Typical applications include simple motor controls, sensor interface boards, low-end consumer appliances, LED display drivers, and educational/prototyping platforms. The 12-bit instruction set is widely documented and supported by a mature toolchain (MPASM assembler, MPLAB IDE), simplifying firmware development for engineers familiar with the PIC architecture. When designing with this device, note that OTP memory cannot be re-programmed — firmware must be fully validated in a windowed EPROM equivalent (e.g., PIC16C55-JW) before committing to the OTP version. Use the lowest available voltage variation for brown-out-sensitive designs and ensure the RC oscillator tolerance meets timing requirements. This page synthesizes distributor pricing snapshots, drop-in same-family alternatives, and practical design considerations that supplement the Microchip datasheet. Information current as of 2026-09-16.

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PIC16C55T-RCE/SS - 8-Bit OTP MCU 768B EPROM 4MHz SSOP-28
PIC16C55T-RCE/SS

PIC16C55T-RCE/SS - 8-Bit OTP MCU 768B EPROM 4MHz SSOP-28

The Microchip Technology PIC16C55T-RCE/SS is an 8-bit, fully static, EPROM/ROM-based CMOS microcontroller that delivers RISC performance at a competitive cost point. Housed in a 28-pin SSOP package and tape-and-reel packaged for high-volume assembly, the device integrates a 12-bit-wide instruction set running at 4 MHz maximum clock, 768 bytes (512 x 12) of One-Time Programmable (OTP) EPROM program memory, and 24 bytes of RAM. Designed for applications where cost and footprint matter more than flash re-programmability, it ships with 20 general-purpose I/O lines for direct digital interfacing. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and I/O peripherals into one package. The PIC16C5X family belongs to the CMOS 8-bit MCU hierarchy -> microcontroller -> embedded controller -> semiconductor IC. OTP EPROM is a variant of programmable non-volatile memory that can be written exactly once, making OTP MCUs ideal for production volumes where firmware is finalized but unit cost must remain low. Key features include a 33-instruction RISC architecture that delivers 2:1 code compression over comparable 8-bit CISC architectures, a Watchdog Timer (WDT) for fault recovery in unattended systems, and Power-on Reset (POR) that initializes the device cleanly on every power-up. The device operates across the standard industrial 3.3V and 5V supply rails, allowing flexibility in both legacy 5V systems and modern low-voltage designs. Built-in I/O structures are CMOS/TTL compatible for straightforward interfacing to logic peripherals. The PIC16C55T-RCE/SS uses a Harvard-class RISC core with a 12-bit instruction word. Only 33 single-word/single-cycle instructions are needed to program the device, reducing developer learning curve and accelerating time-to-market. With four oscillator options (RC, LP, HS, XT) selectable by part-number suffix, designers trade off cost, power, and frequency against the application's clock-precision requirements. Typical applications include appliance controllers, simple sensor interfaces, automotive body electronics, security keypads, remote-control transmitters, industrial timers, and low-cost consumer products where flash reprogrammability is unnecessary. The 28-pin SSOP footprint drops into board layouts shared with other PIC16C5X and PIC16C55A family devices, simplifying PCB reuse across product variants. A practical design tip: because PIC16C55T-RCE/SS is OTP, prototype on a windowed or flash-based equivalent (such as PIC16F or PIC18F in the same footprint) and only commit OTP ROMs for production once firmware is fully validated. Verify the oscillator suffix ("E" in this part = RC oscillator) against the actual resonator or RC network on the PCB. This page consolidates distributor pricing, drop-in PIC16C5X family alternatives, and practical design notes that are not collated on a single manufacturer datasheet page.

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PIC16C55T-RCI/SO - 8-Bit 4MHz OTP MCU 768B | 28-SOIC | Microchip
PIC16C55T-RCI/SO

PIC16C55T-RCI/SO - 8-Bit 4MHz OTP MCU 768B | 28-SOIC | Microchip

The Microchip Technology PIC16C55T-RCI/SO is an 8-bit PIC® microcontroller from the PIC16C5X family, delivering 4MHz operation with 768 bytes of One-Time Programmable (OTP) program memory (512 x 12 words), 24 bytes of RAM, and 20 I/O pins in a 28-SOIC package supplied on tape and reel. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, volatile data RAM, and configurable I/O peripherals on one die. The PIC® 16C5X family is part of the original Microchip baseline RISC architecture, which sits at the bottom of the 8-bit MCU taxonomy: PIC16C5X -> PIC16C family -> PIC16 -> 8-bit PIC microcontrollers -> Microcontrollers -> Microcontrollers and Processors -> Semiconductor. The RISC Harvard architecture separates program and data buses for predictable single-cycle instruction execution, which simplifies timing analysis in cost-sensitive embedded designs. Key specifications of the PIC16C55T-RCI/SO include a 4MHz maximum clock rate, 768B (512 x 12) OTP program memory, 24 bytes of general-purpose RAM, 20 digital I/O pins organized into ports, an external oscillator interface, and on-chip Power-On Reset (POR) and Watchdog Timer (WDT) peripherals. The 'R' suffix indicates RC oscillator compatibility while 'C' denotes the commercial operating temperature grade and 'I' the industrial temperature range. The device operates from a 3V to 6.25V supply, supports an operating temperature range of -40°C to +85°C, and uses the well-documented PIC16C5X 12-bit instruction set. The lack of on-chip Flash or EEPROM and the 512-word program memory reflect the family's heritage as a low-cost, OTP-based replacement for fixed-logic glue functions in volume production. Typical applications include appliance control, simple sensor interfaces, RC-servo hobby drivers, low-end consumer electronics, and industrial control subsystems where deterministic behavior, low cost, and legacy code reuse outweigh the need for reprogrammability. The 28-SOIC footprint is compatible with hand-solder prototyping and high-volume SMT assembly lines. When designing with this part, designers should plan for OTP programming at the contract manufacturer and add a watchdog timer reset strategy in firmware. Note that PIC16C5X devices do not support in-system programming (ICSP) in the same way as Flash-based PICs, so a parallel programmer or production-grade gang programmer is required. Designers migrating to a Flash-based part should evaluate PIC16F54 or PIC16F57 as second-source options. This page consolidates distributor pricing, packaging details, drop-in same-package alternatives, and practical design notes for the PIC16C55T-RCI/SO that are not typically found on a single manufacturer page.

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PIC16C55T-RCI/SS - 8-Bit 4MHz OTP MCU 768B | Microchip 28-SSOP
PIC16C55T-RCI/SS

PIC16C55T-RCI/SS - 8-Bit 4MHz OTP MCU 768B | Microchip 28-SSOP

The Microchip Technology PIC16C55T-RCI/SS is an 8-bit CMOS microcontroller from the PIC16C5X family, delivering 4MHz CPU performance with 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory and 24 bytes of data RAM in a 28-pin SSOP surface-mount package. The 'T' suffix denotes tape-and-reel packaging, 'RC' indicates the RC oscillator variant, 'I' marks the industrial temperature grade (-40C to +85C), and 'SS' designates the 28-SSOP 5.30mm body. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, RAM, and I/O peripherals on one die. The PIC16C5X family belongs to the baseline PIC architecture using a 12-bit instruction word with a two-stage pipeline, classified under the hypernym chain: microcontroller -> embedded processor -> microprocessor -> semiconductor IC. OTP memory allows factory programming but cannot be re-written, balancing cost against in-field reprogrammability. Key features include 20 I/O pins, an 8-bit timer/counter, watchdog timer, power-on reset, and RC oscillator support with external clock option. The device operates from 3V to 6.25V and consumes low current typical of CMOS designs. The PIC RISC architecture executes most instructions in a single cycle, providing deterministic throughput for real-time control loops. The 12-bit wide instruction word allows compact code density, and the Harvard bus keeps program and data paths separate for predictable timing. Typical applications include industrial automation controllers, consumer appliance logic replacement, automotive sub-system controllers, sensor signal conditioning front-ends, and small embedded timing/sequencing tasks. The industrial temperature range permits deployment in uncontrolled environments, and the SSOP footprint suits dense PCB layouts where DIP-28 alternatives would consume too much board area. When designing with this part, note that OTP memory requires pre-production programming; revisions cannot be field-deployed without physical replacement. The 4MHz top speed is adequate for slow control loops but limiting for any signal processing. Ensure decoupling caps of 0.1uF are placed near VDD and that unused I/O pins are configured as outputs to minimize current draw. This page synthesizes distributor pricing, drop-in 28-SSOP alternatives, and practical design notes for the PIC16C55T-RCI/SS, giving engineers a faster sourcing decision than distributor catalog pages alone.

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