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PIC16C57-RCI/SS - 8-bit 3KB OTP MCU, 20 I/O, 28-SSOP | Microchip
PIC16C57-RCI/SS

PIC16C57-RCI/SS - 8-bit 3KB OTP MCU, 20 I/O, 28-SSOP | Microchip

The Microchip Technology PIC16C57-RCI/SS is a high-performance 8-bit CMOS EPROM/ROM-based microcontroller in a 28-pin SSOP package, offering 3KB of One-Time-Programmable (OTP) program memory, 72 bytes of RAM, and 20 digital I/O pins. Operating from a 3.0V to 5.5V supply, it executes instructions in a 200 ns single-cycle period at 20 MHz, delivering 5 MIPS throughput in an extremely compact footprint. An 8-bit microcontroller (MCU) is a single-chip computer integrating an 8-bit CPU, program memory, data RAM, and peripheral I/O on one die. The PIC16C5X family sits at the low end of Microchip's PIC architecture hierarchy - beneath PIC12, PIC14, and the mid-range PIC16 enhanced core, but above simple 4-bit controllers. These MCUs serve as the embedded "brain" of systems where low cost, deterministic instruction execution, and easy programming outweigh the need for large memory or high-speed analog peripherals. Key features of the PIC16C57 include a RISC instruction set of only 33 single-word instructions, a 12-bit wide instruction word for 2:1 code compression over competitive 8-bit MCUs, a hardware watchdog timer, an 8-bit real-time timer/counter, programmable code protection, and power-saving SLEEP mode. The device is fully static, allowing the clock to be stopped without losing register contents, and supports both RC and crystal/ceramic resonator oscillator configurations. The architecture combines a Harvard bus (separate program and data memory paths) with a 2-stage pipeline, which is why most instructions execute in a single 200 ns cycle. This pipelined RISC core predates the more capable PIC16 enhanced mid-range family and is intended for straightforward control loops, sensor polling, and glue-logic replacement in cost-sensitive products. Typical applications include consumer appliance controls, battery chargers, LED drivers, simple sensor interfaces, security panel keypads, and low-end remote controls. Industrial uses span small motor control boards, instrumentation front-ends, and user-interface modules where the 20 I/O pins and 3KB program memory are sufficient. The PIC16C57-RCI/SS in industrial (-40C to +85C) grade is a frequent choice for harsh-environment designs. When designing with the PIC16C57, note that it lacks an on-chip debugger and in-circuit serial programming (ICSP) header support in the original 1990s silicon - modern debug requires a header and an emulator or ICE. For new designs, Microchip recommends the flash-based PIC16F57 successor with identical pinout but reprogrammable memory. This page synthesizes distributor pricing, pin-compatible SSOP alternatives, and design notes that go beyond the manufacturer datasheet.

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PIC16C57-XT/P - 8-Bit 4MHz OTP MCU, 3KB ROM, 28-PDIP | Microchip
PIC16C57-XT/P

PIC16C57-XT/P - 8-Bit 4MHz OTP MCU, 3KB ROM, 28-PDIP | Microchip

The Microchip Technology PIC16C57-XT/P is an 8-bit CMOS OTP (one-time programmable) RISC microcontroller with a 4 MHz maximum clock, 3 KB (2K x 12) of program memory, 72 bytes of RAM, and 20 general-purpose I/O pins in a 28-pin PDIP through-hole package. The 'XT' suffix denotes the use of a standard (resonator or crystal) oscillator, while the '/P' suffix designates the plastic DIP package, making the device breadboard-friendly and well suited to legacy industrial designs. What is an 8-bit microcontroller? An 8-bit microcontroller (MCU) is a single-chip computer that processes data 8 bits at a time and integrates a CPU core, program memory, data RAM, and peripherals such as timers, I/O ports, and interrupt controllers into one package. The PIC16C family is the baseline of Microchip's PIC16 lineup, employing a 12-bit instruction word and RISC architecture that achieves roughly 2:1 code compression over competing 8-bit MCUs in the same price tier. It sits within the broader hierarchy MCU -> microcontroller -> embedded processor -> semiconductor. Key features include a two-level deep hardware stack, direct/indirect/relative addressing modes for both data and instructions, seven or eight special function hardware registers, and an 8-bit real-time clock/counter (TMR0) with an 8-bit prescaler. The device operates from 3.0 V to 5.5 V and supports both power-saving Sleep mode and a Watchdog Timer for unattended or remote applications. The 12-bit wide instruction set is highly orthogonal, simplifying assembly programming and compiler porting. Technically, the PIC16C57 uses a Harvard architecture with separate program and data buses, allowing instruction fetch and operand access in a single cycle for most instructions. The OTP program memory is programmed once with the MPLAB PM3 Universal Device Programmer and cannot be erased or rewritten, which makes the PIC16C57 ideal for high-volume production where unit cost dominates engineering NRE. Typical applications include legacy industrial controllers, appliance control boards, automotive body electronics (non-safety), consumer white-goods user interfaces, and educational development platforms. The wide DIP package also makes it a popular choice for hobbyist retrocomputing projects and product prototyping where through-hole assembly remains convenient. When designing with this part, note that OTP memory cannot be field-updated; for field-upgradable firmware select the flash-based PIC16F57 instead. Always provide a proper oscillator stabilization delay after POR or Wake-up before code execution begins, as defined in the device datasheet. This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, helping engineers source, compare, and design with the PIC16C57-XT/P efficiently.

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PIC16C57-XT/SP - 8-Bit OTP MCU, 4MHz, 28-SPDIP | Microchip
PIC16C57-XT/SP

PIC16C57-XT/SP - 8-Bit OTP MCU, 4MHz, 28-SPDIP | Microchip

The Microchip Technology PIC16C57-XT/SP is an 8-bit CMOS OTP (One-Time-Programmable) microcontroller built on Microchip's PIC16 RISC architecture, packaged in a 28-pin SPDIP (Skinny Plastic DIP) and operating at a maximum clock speed of 4MHz as indicated by the -XT speed suffix. According to the manufacturer listing, it integrates 3KB of program memory (2K x 12 OTP words) and 72 bytes of general-purpose RAM, with 20 digital I/O pins and a single 8-bit Timer0 module. Background: An OTP microcontroller is a class of MCU whose program memory is written once by a device programmer (or by the user with the appropriate programmer, e.g., Microchip MPLAB PM3) and cannot be erased thereafter. OTP parts sit in the broader hierarchy of one-time-programmable non-volatile memory -> EPROM-based program storage -> microcontroller -> embedded computing -> semiconductor. They are commonly used when code is finalized, unit cost must be minimized, and the production volume does not justify a windowed or flash-based variant. The PIC16C5X family is a classic baseline architecture - 12-bit wide instructions, 8-bit data path, a 2-level deep hardware call stack, and 33 single-word instructions - delivering efficient code density for control tasks. Key features: 33 single-word instructions (12-bit wide), 4MHz maximum oscillator input, two-level deep hardware call stack, direct/indirect/relative addressing, an 8-bit real-time counter (TMR0), and a 4 MHz internal instruction cycle of 1us per instruction. Operating voltage is 3.0V-6.0V and the commercial temperature range is 0C to +70C. The 'XT' suffix denotes a standard crystal/resonator oscillator mode, and the /SP suffix indicates SPDIP packaging supplied in anti-static tube. Lifecycle status is NRND (Not Recommended for New Designs) - production continues for existing customers but new designs should target the flash-based PIC16F57 equivalent. Technical depth: The PIC16C57 uses a Harvard-style RISC core with separate program and data buses, allowing instruction fetch and operand access in a single cycle. Program memory is 12 bits wide and is organized as 2K x 12 OTP, while data memory is 8 bits wide and organized into general-purpose and special-function registers. With a 4MHz oscillator the instruction cycle is 1 MHz (one instruction per microsecond). The 2-level hardware stack limits call depth - subroutines can only nest one level deep. Typical applications: simple appliance controllers, keyboard and remote-control encoders, LED chaser and lighting effects, battery chargers, fan speed controllers, security keypads, and industrial sensor interfaces. Its 20 I/O pins and small code footprint make it ideal for cost-sensitive, high-volume embedded products where programming is done once at the factory. Design consideration: Because the device is OTP, the firmware revision is permanent - any code bug discovered after programming requires scrapping the silicon. Use a flash-based sibling (PIC16F57) for prototype development, then convert the final binary to the OTP PIC16C57-XT/SP for production.

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PIC16C57-XT/SS - 8-Bit EPROM MCU 4MHz 28-SSOP | Microchip
PIC16C57-XT/SS

PIC16C57-XT/SS - 8-Bit EPROM MCU 4MHz 28-SSOP | Microchip

The Microchip Technology PIC16C57-XT/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, offering 3 KB (2 K x 12) of one-time-programmable program memory, 72 bytes of RAM, and 20 programmable I/O pins in a 28-pin SSOP package. It operates at a maximum clock frequency of 4 MHz and runs from a single 3.3 V or 5 V supply, drawing a fraction of the current of comparable MCUs in its class. What is a PIC16C5X microcontroller? The PIC16C5X is a family of low-cost, high-performance, 8-bit fully static EPROM/ROM-based CMOS microcontrollers that deliver an order-of-magnitude higher performance than competing 8-bit microcontrollers in the same price category. The 12-bit wide instructions are highly symmetrical, producing a 2:1 code compression over other 8-bit MCUs in its class. These devices belong to the broader category of microcontrollers -> 8-bit MCUs -> EPROM-based MCUs -> embedded controllers -> semiconductors, and are commonly deployed in cost-sensitive, space-constrained embedded designs. Key features include 12-bit wide instructions, an 8-bit wide data path, 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 handles timing events. The 'XT' suffix denotes a 4 MHz external crystal/oscillator speed option, and 'SS' denotes the 28-pin SSOP (5.30 mm body width) package. Technically, the PIC16C57-XT/SS uses a RISC architecture with a 12-bit instruction word and an 8-bit data path. The OTP EPROM program memory enables prototype and pre-production programming before committing to a ROM mask, while the SSOP package is suited to surface-mount manufacturing. Typical applications include consumer appliance controllers, simple sensor interfaces, LED lighting controllers, small white-goods motor controls, and educational/development boards. The PIC16C57-XT/SS is well-suited where an 8-bit MCU with modest memory and GPIO is sufficient and BOM cost must be minimized. When designing, ensure the oscillator load capacitors match the crystal specification; the absence of an internal oscillator requires an external clock source for the XT variant. Programming is performed via Microchip MPLAB PM3 or compatible device programmers. This page synthesizes distributor pricing, same-package pin-compatible Microchip drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16C57-XTE/P - 8-Bit 4MHz 3KB OTP MCU 28-PDIP | Microchip
PIC16C57-XTE/P

PIC16C57-XTE/P - 8-Bit 4MHz 3KB OTP MCU 28-PDIP | Microchip

The Microchip Technology PIC16C57-XTE/P is an 8-bit RISC microcontroller from the PIC16C5X family, featuring 3KB (2K x 12) of One-Time-Programmable (OTP) EPROM program memory, 72 bytes of RAM, and 20 digital I/O pins, all housed in a 28-pin PDIP (0.600 inch / 15.24 mm) through-hole package. Operating at a maximum clock frequency of 4MHz (XT oscillator grade, extended temperature), the device runs from a 3.25V to 6V supply and is fabricated on a low-power CMOS process. The 12-bit-wide instruction set delivers 2:1 code compression over competitive 8-bit microcontrollers, and the RISC architecture executes most instructions in a single 200ns machine cycle at 20MHz equivalent throughput. The '-XTE' suffix designates the XT oscillator range (typically 4MHz external crystal/resonator) and the 'E' suffix denotes the extended industrial temperature grade (-40C to +125C). A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, working RAM, and programmable I/O peripherals. The PIC16C5X family belongs to the baseline 8-bit MCU category within Microchip's broader PIC® microcontroller hierarchy (baseline PIC10/12/16 -> mid-range PIC16 -> enhanced mid-range PIC16/18 -> 16-bit PIC24 -> 32-bit PIC32). It sits below the popular PIC16F and PIC18 families in capability but above simple 6-pin PIC10F devices in pin count and feature set. OTP EPROM-based MCUs are typically chosen for cost-sensitive, mature, or high-volume production designs where the program is finalized at build time and does not require field re-programmability. Key features include 33 single-word instructions, two 8-bit timer/counters (TMR0 and TMR1-equivalent watchdog), a watchdog timer with on-chip RC oscillator, 4 MHz internal/external clock input, power-on reset, power-saving SLEEP mode, and 20 high-current source/sink I/O pins capable of directly driving LEDs. The device supports in-circuit serial programming (ICSP) via RB6/RB7 pins when used in compatible configurations, although the OTP die does not permit field erasure. Code protection bits and oscillator selection fuses are configured at program time. Architecturally, the PIC16C5X uses a Harvard architecture with separate program and data buses, a 12-bit program counter addressing up to 2K words of OTP EPROM, and a 7-bit RAM address space mapping 72 bytes of general-purpose registers plus peripheral control registers. The ALU is 8-bit wide; arithmetic, logical, and bit-manipulation instructions all execute in a single cycle except branches (2 cycles). This compact, deterministic instruction set is why PIC MCUs remain popular for hard-real-time control loops in appliance, automotive, and industrial applications. Typical applications for the PIC16C57-XTE/P include appliance control boards (washing machines, microwave ovens, dishwashers), HVAC thermostat and damper controllers, simple sensor-interface boards, LED driver controllers, low-cost toys and consumer gadgets, industrial timer/counter modules, and automotive body electronics (interior lighting, seat controllers) where the extended temperature grade is required. The 20 I/O count and 4MHz throughput make it well suited to bit-banging protocols (UART, I2C slave, SPI slave) and direct keypad/display multiplexing. When designing with this device, ensure the OTP window is covered with opaque label tape if the part is ever exposed to UV light during board rework, because EPROM cells can be erased by direct sunlight or UV-C. Allocate the oscillator start-up timer delay (typically 1024 Tosc) before code releases the SLEEP wakeup path, and respect the 6V absolute-maximum VDD to avoid latch-up. The 28-PDIP footprint has remained pin-compatible across the PIC16C5X baseline family for over two decades, simplifying long-life industrial designs.

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PIC16C57-XTE/SP - 8-Bit OTP MCU, 4MHz, 2KB EPROM | Microchip
PIC16C57-XTE/SP

PIC16C57-XTE/SP - 8-Bit OTP MCU, 4MHz, 2KB EPROM | Microchip

The Microchip Technology PIC16C57-XTE/SP 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 SPDIP (Skinny Plastic DIP) package, this device integrates 2KB of one-time-programmable (OTP) EPROM program memory organized as 2K x 12 words and 72 bytes of on-chip data RAM. It supports a maximum clock frequency of 40MHz (4MHz at the XTE speed grade) and operates from 3.0V to 5.5V. What is an 8-bit OTP microcontroller? An 8-bit OTP microcontroller is a small single-chip computer built around an 8-bit data path that executes instructions stored in one-time-programmable non-volatile memory. Within the broader taxonomy of semiconductors, the PIC16C57 belongs to the microcontroller (MCU) family, then to the 8-bit MCU sub-class, then to the OTP EPROM-based MCU series, and ultimately to the Microchip PIC16C5X entry-level family. This hierarchy makes it well suited for cost-sensitive embedded control where Flash reprogrammability is not required. Key features include a RISC instruction set with 33 single-word, single-cycle instructions, 12-bit wide opcodes yielding 2:1 code compression over typical 8-bit competitors, and 20 general-purpose digital I/O lines arranged across ports RA, RB, RC, and RD. The device includes an 8-bit timer/counter (TMR0) with an 8-bit programmable prescaler, a watchdog timer with its own on-chip RC oscillator for reliable reset, and a power-on reset circuit. The two-stage instruction pipeline enables most instructions to execute in a single 250ns instruction cycle at 16MHz. Typical applications include consumer appliance control, automotive body electronics (non-safety), HVAC damper and fan control, simple sensor interfaces, remote-control transmitters, battery chargers, and low-cost industrial timer/sequencer designs. Because the program memory is windowed EPROM (erasable only by UV exposure in the ceramic JW package, or one-time programmable in the plastic SPDIP variant), the XTE/SP version is intended primarily for production volumes where firmware is fixed and validated. When designing with this device, note that the PIC16C57 uses a 12-bit program counter and cannot directly access large linear memory spaces, so complex C code is uncommon; assembly language or the free MPASM toolchain is the typical development path. Programming is performed via Microchip's MPLAB PM3 universal device programmer. The 'XTE' suffix denotes the extended-temperature grade (-40C to +85C) with the standard PIC16C5X speed grade (DC to 4MHz oscillator). This page synthesizes distributor pricing, parametric cross-references to compatible PIC16C5X family members, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C57-XTE/SS - 8-Bit OTP MCU, 4MHz, 28-SSOP | Microchip
PIC16C57-XTE/SS

PIC16C57-XTE/SS - 8-Bit OTP MCU, 4MHz, 28-SSOP | Microchip

The Microchip Technology PIC16C57-XTE/SS is an 8-bit CMOS RISC microcontroller with 2K x 12 (3 KB) One-Time Programmable (OTP) EPROM program memory, housed in a 28-pin SSOP (Shrink Small Outline Package, 5.30 mm body width). It operates from a 5 V supply at a maximum clock frequency of 4 MHz (the "XT" speed grade), delivering up to 20 I/O lines arranged across multiple ports, 72 bytes of on-chip data RAM, and 33 single-word single-cycle instructions. Peripherals include a Watchdog Timer (WDT), Power-on Reset (POR), and two 8-bit timers. The device belongs to the PIC16C5X baseline family and is intended for surface-mount high-volume cost-sensitive embedded designs. An 8-bit microcontroller (MCU) is a small, self-contained computer-on-a-chip integrating a CPU, program memory, working RAM, I/O peripherals, and timers into a single silicon die. Within the broader semiconductor taxonomy, an MCU is a subclass of microprocessor (MPU -> MCU), and the PIC16C5X family sits in the low-cost baseline segment (baseline -> mid-range -> enhanced mid-range), optimized for deterministic real-time control rather than raw computational throughput. The Harvard-style architecture with separate program and data buses allows instructions to be fetched and executed in a single cycle, which is why most PIC instructions complete in one oscillator period. Key differentiating features include the 4 MHz "XT" oscillator variant (a crystal/ceramic-resonator speed grade vs the lower-frequency "LP" and higher-frequency "HS" grades), the OTP-EPROM program memory window (versus windowed EPROM "JW" or QTP/sqTP pre-programmed variants), 20-digit code-protection capability for IP security, and the SSOP 0.209" 5.30 mm wide surface-mount footprint. The 12-bit wide instruction word is characteristic of the baseline PIC16C5X family and should not be confused with the 14-bit mid-range cores. The architecture follows Microchip's classic RISC design with only 33 single-word/single-cycle instructions, two file-select registers for context switching, and an 8-level hardware stack (no software-managed stack pointer). This simplicity translates into deterministic interrupt response and small code footprints. The device operates across the industrial 0 to +70 °C commercial temperature range ("-E" suffix = extended commercial), with Vdd between 2.5 V and 6.25 V depending on the oscillator configuration. Typical applications include low-cost consumer appliances, white goods, automotive interior accessories, HVAC thermostat controls, simple sensor front-ends, and remote-control transmitters where deterministic timing, small BOM, and OTP-based cost optimization outweigh the need for in-system reprogrammability. Designers pair the PIC16C57 with low-cost 4 MHz ceramic resonators or crystals and use ICD or MPLAB PM3 programmers for code development and production programming. When designing with this device, remember that the OTP variant cannot be reprogrammed, so design verification must occur on a windowed "JW" prototype or on the flash-based PIC16F5X equivalent before committing to OTP production parts. The 8-level hardware stack limits nested subroutines to depth eight; deeper call chains must be unrolled. The PIC16C5X baseline core lacks interrupts on most variants - check the device errata before designing interrupt-driven code. This page synthesizes distributor pricing, drop-in same-family alternatives from the Site MPN catalog, and practical design notes not collected in any single manufacturer datasheet, giving embedded engineers a faster selection path than scrolling through DigiKey or Mouser listings.

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PIC16C57-XTI/P - 8-Bit 4MHz 3KB OTP MCU 28-PDIP | Microchip
PIC16C57-XTI/P

PIC16C57-XTI/P - 8-Bit 4MHz 3KB OTP MCU 28-PDIP | Microchip

The Microchip PIC16C57-XTI/P is an 8-bit CMOS microcontroller from the PIC16C5X family, featuring 3KB (2K x 12) of One-Time-Programmable (OTP) program memory, 72 bytes of RAM, and 20 I/O pins in a 28-pin PDIP (Plastic Dual In-line Package). It operates at a 4 MHz oscillator frequency with an industrial temperature range of -40C to +85C and is suitable for embedded control applications requiring a compact, low-pin-count architecture. The PIC16C5X family uses a Harvard RISC-style architecture with 12-bit-wide instructions and a 33-instruction set, providing roughly 2:1 code compression versus other 8-bit microcontrollers in its class. An 8-bit microcontroller (MCU) is a single-chip computer containing a CPU, program memory, data RAM, and peripheral interfaces on one die. Within the broader taxonomy, the PIC16C57 belongs to the 8-bit MCU hypernym -> microcontroller family -> embedded IC -> semiconductor. The 'C' suffix indicates CMOS EPROM/OTP program memory (versus 'F' for Flash and 'CR' for ROM), and the PIC16C5X series is one of Microchip's foundational mid-range architectures predating the later PIC16F and PIC18 families. OTP memory is programmed once and is non-erasable, which makes the part cost-effective for high-volume production but unsuitable for firmware revision. Key features of the PIC16C57-XTI/P include 12-bit instruction width, 33 single-cycle instructions (excluding branches), two 8-bit timer/counters (TMR0 with 8-bit programmable prescaler, TMR1), a watchdog timer with on-chip RC oscillator, and a power-on reset (POR) circuit. The device operates over a 2.5V to 6.25V VDD range and consumes very low operating current thanks to its CMOS design. The -XTI suffix designates a 4 MHz crystal/oscillator industrial-temperature-grade variant in PDIP packaging. Architecturally, the PIC16C57 uses a 2-stage pipeline with an 8-bit data path and a separate 12-bit program path (Harvard architecture). Its 8-level deep hardware stack limits subroutine nesting to 8 levels, which constrains complex C compilers but suits compact assembly-level firmware. The device has four interrupt sources with a fixed interrupt vector and supports direct, indirect, and relative addressing modes. Typical applications include consumer appliance controls, automotive body electronics (non-safety), industrial sensor front-ends, low-cost remote controls, and battery-powered metering. The 20 available I/O pins make it well-suited to small user-interface boards and LED/keypad scan matrices. Because the PIC16C57 is mature and well-documented, it remains popular in maintenance-of-existing-design and legacy industrial equipment scenarios. When designing with the PIC16C57-XTI/P, engineers should use the MPLAB PM3 Universal Device Programmer (or a compatible gang programmer) and the MPLAB IDE v8.x or earlier for assembly development. Designers must budget the 8-level hardware stack carefully and avoid C compilers that require deep call nesting. For new designs, the PIC16F57 or PIC16F57 Flash variant offers in-circuit reprogrammability with pin-compatible migration paths. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on a single manufacturer or distributor datasheet page.

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PIC16C57-XTI/SS - 8-bit 4MHz 3KB OTP MCU 28-SSOP | Microchip
PIC16C57-XTI/SS

PIC16C57-XTI/SS - 8-bit 4MHz 3KB OTP MCU 28-SSOP | Microchip

The Microchip Technology PIC16C57-XTI/SS is a member of the PIC16C5X family of low-cost, high-performance 8-bit fully static EPROM/ROM-based CMOS microcontrollers. It integrates a RISC CPU core running up to 4 MHz, 3 KB of OTP program memory (2K x 12 words), and 72 bytes of general-purpose RAM in a 28-pin SSOP (Shrink Small Outline Package) with industrial -40C to +85C temperature grade. The -XTI/SS suffix denotes the industrial temperature range and SSOP tube packaging per Microchip ordering nomenclature. An 8-bit PIC microcontroller is a single-chip computer that combines a CPU, non-volatile program memory (here, One-Time Programmable EPROM), working RAM, and configurable I/O on one die. PIC microcontrollers sit within the broader hierarchy of microcontrollers -> microcontrollers and microprocessors -> integrated circuits -> semiconductors, and dominate cost-sensitive embedded control because the RISC architecture uses only 33 single-word/single-cycle instructions, yielding highly compact code and predictable deterministic timing. Key features of the PIC16C57-XTI/SS include a 12-bit instruction word, two-level hardware stack, 20-pin equivalent I/O, an 8-bit real-time timer/counter (TMR0), direct/indirect/relative addressing, watchdog timer, power-on reset, and brown-out detection. The EPROM-based program memory allows rapid prototyping before committing to a ROM mask part, while the 4 MHz oscillator supports both RC and crystal/ceramic resonator modes. Architecturally, the device uses a Harvard bus with separate program and data paths, enabling instruction fetch and data access in the same cycle. CMOS fabrication delivers low power consumption with standby currents typically below 4 uA at 5V, suitable for battery-backed or energy-harvesting designs. With seven or eight special function hardware registers and 33 instruction opcodes, the learning curve is among the shortest in the industry. Typical applications include appliance controls, security and alarm panels, automotive body electronics (non-safety), low-end remote controls, sensor signal conditioning, lighting ballasts, and small industrial timer or counter modules. The wide 2.5V to 6.0V Vdd range allows direct operation from 3.3V or 5V rails. When designing with the PIC16C57-XTI/SS, confirm EPROM programming infrastructure (windowless OTP requires a programmer such as MPLAB PM3) and verify the industrial -40C to +85C temperature range matches deployment conditions. For higher pin counts, more memory, or in-circuit programmability, migrate to PIC16F57 or PIC16F84A. This page synthesizes distributor pricing, drop-in alternatives from the PIC16C5X family, and practical design notes not found in the bare manufacturer datasheet, optimized for procurement and engineering teams evaluating legacy 8-bit MCU replacements.

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PIC16C57C-04/SS - 4MHz 8-Bit OTP MCU 3KB 28-SSOP | Microchip
PIC16C57C-04/SS

PIC16C57C-04/SS - 4MHz 8-Bit OTP MCU 3KB 28-SSOP | Microchip

The Microchip Technology PIC16C57C-04/SS is a CMOS OTP-based 8-bit microcontroller from the PIC16C5X family, delivering 4 MHz (4 MHz oscillator / 100 ns instruction cycle) processing in a 28-pin SSOP package. The device integrates 3 KB of OTP program memory (2K × 12 words) and 72 bytes of RAM with 20 digital I/O lines, and it is specified for operation from 2.5 V to 5.5 V across the commercial 0 °C to +70 °C range (C suffix). It executes 33 single-word, 12-bit RISC instructions and uses a 2-level hardware stack. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral I/O. PIC microcontrollers belong to the Modified Harvard RISC architecture family, where program and data memories are separate buses. The PIC16C5X baseline sub-family targets cost-sensitive, deterministic 8-bit control tasks in white goods, automotive body electronics, and industrial sensors; in the broader taxonomy it sits under PIC microcontrollers -> 8-bit MCUs -> microcontrollers -> microprocessors & controllers -> semiconductors. Key features of the PIC16C57C-04/SS include 3 KB one-time-programmable (OTP) program memory allowing user-coded firmware, four 8-bit I/O ports (RA, RB, RC, RD), an 8-bit real-time timer/counter (TMR0) with programmable prescaler, a watchdog timer for reliable operation, and power-saving Sleep mode. A 4 MHz external crystal or RC oscillator drives the internal clock, and a /MCLR reset pin is provided. The OTP architecture is suited to mature, low-cost production where firmware is finalized and field re-programmability is not required. The 28-pin SSOP (209 mil, 1.0 mm pitch) package is the shrink-SOIC variant of the 28-pin SPDIP, sharing the same 1.27 mm row pitch in a more compact outline. Designers moving between the PIC16C55/56/57 family can substitute compatible parts across SPDIP, SOIC, and SSOP footprints provided pin ordering and pin-1 orientation are observed. Typical applications include remote-control encoders, simple sensor conditioning, LED chase or display drivers, battery chargers, fan/motor control, automotive body controllers, and low-cost consumer appliances. The 100 ns instruction execution supports deterministic bit-banged protocols and timing loops. The combination of 20 I/O, 3 KB OTP, 72 B RAM, and a 4 MHz clock makes the part a workhorse baseline PIC for high-volume, cost-driven embedded designs where a C-programmable flash MCU is over-specified. When designing with this device, use a 4.7 kΩ pull-up on /MCLR to VDD, place a 0.1 µF decoupling capacitor on VDD near the IC, and choose a 4 MHz crystal with 22 pF loading capacitors. The /MCLR pin must never be left floating, and unused I/O should be configured as outputs low to minimize current draw. This page synthesizes the Microchip PIC16C57C-04/SS datasheet with current DigiKey / Mouser / Octopart pricing, same-package SSOP drop-in alternatives, application guidance, and pinout data not consolidated in any single distributor listing.

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PIC16C57C-04E/SP - 8-Bit 4MHz OTP MCU, 3KB, 28-SPDIP | Microchip
PIC16C57C-04E/SP

PIC16C57C-04E/SP - 8-Bit 4MHz OTP MCU, 3KB, 28-SPDIP | Microchip

The Microchip Technology PIC16C57C-04E/SP is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, operating at 4 MHz with 3 KB (2K x 12) of One-Time-Programmable (OTP) program memory, 72 bytes of RAM, and 20 digital I/O pins in a 28-pin SPDIP (Skinny Plastic DIP) through-hole package. The "04E" suffix denotes the 4 MHz oscillator variant with the extended industrial temperature grade (-40C to +125C), while "/SP" identifies the 28-SPDIP package and tube shipping format. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral I/O into one IC. The PIC16C5X family sits at the low-cost end of the 8-bit microcontroller taxonomy, between simple 4/8-bit PIC10/PIC12 devices and the more feature-rich PIC16 enhanced and PIC18 families. By using 12-bit-wide instructions with 33 single-word instruction set, the PIC16C57C achieves roughly 2:1 code compression versus competitive 8-bit MCUs, allowing small OTP programs to fit cost-sensitive assemblies without external memory. Key features of the PIC16C57C-04E/SP include 100 ns instruction cycle time at 4 MHz oscillator input, a wide 3.0 V to 5.5 V single-supply operating range, a programmable 8-bit timer (TMR0) with 8-bit prescaler, watchdog timer with on-chip RC oscillator for reliable reset behavior, power-saving SLEEP mode, and on-chip power-on reset (POR). The 20 I/O pins support individual direction control, with high-current sink/source capability for direct LED and relay drive. Code protection and a 12-bit instruction word target compact, deterministic control loops rather than complex protocol stacks. Architecturally, the PIC16C57C uses a Harvard RISC core with separate program and data buses, a hardware ALU, and an 8-level deep stack that supports interrupt-free subroutine nesting. The OTP program memory is programmed once via Microchip's standard ICSP serial protocol and cannot be erased, making this part best suited for mature production where firmware is final; for field-reprogrammable designs, a Flash-based PIC16F57 is the closest replacement with the same pinout and peripheral set. Typical applications include appliance control boards, automotive body modules (seat, mirror, lighting), industrial sensor interfaces, low-end remote controls, simple user-interface panels, and battery-powered smart sensors. The wide supply range, robust ESD/latch-up characteristics, and extended temperature grade make the -04E/SP variant especially attractive for under-hood automotive, outdoor industrial, and HVAC systems. When designing with the PIC16C57C, keep the oscillator selection short and use a 100 nF decoupling capacitor close to VDD, plus a 10-47 uF bulk capacitor. Note that OTP memory cannot be re-programmed; budget engineering time for prototype validation on a windowed (JW) or Flash equivalent before committing firmware to OTP. This page combines verified distributor pricing, parametric alternatives, application guidance, and AEO-optimized FAQs drawn from Microchip PIC16C5X datasheet content, with value beyond the bare manufacturer datasheet.

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PIC16C57C-04E/SS - 8-bit OTP MCU 4MHz 3KB 28-SSOP | Microchip
PIC16C57C-04E/SS

PIC16C57C-04E/SS - 8-bit OTP MCU 4MHz 3KB 28-SSOP | Microchip

The Microchip Technology PIC16C57C-04E/SS is an 8-bit CMOS RISC microcontroller belonging to the PIC16C5X family, featuring a 4MHz maximum core clock, 3KB (2K x 12) of One-Time Programmable (OTP) program memory, and 72 bytes of RAM, housed in a 28-pin SSOP package. The device executes instructions in a 100 ns single-cycle period and supports 33 single-word instructions, providing roughly 2:1 code compression versus other 8-bit MCUs in its class. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces into one package. The PIC16C57C falls under the broader taxonomy: microcontroller -> embedded controller -> 8-bit MCU -> RISC MCU -> CMOS OTP MCU -> semiconductor. As an OTP device it can be programmed exactly once, which makes it suited to high-volume fixed-function products rather than field-upgradeable designs. Key features include 20 general-purpose digital I/O pins, a 4MHz internal operating frequency (-04 speed grade), 8-bit timer/counter resources, a watchdog timer for reliable unattended operation, power-on reset, brown-out detection, and a wide 3.0V to 5.5V supply range. The SSOP-28 footprint enables compact board layouts while still supporting hand-soldering or standard SMT lines. Architecturally the device uses a Harvard RISC core with separate program and data paths, a 12-bit wide instruction word, and a two-stage pipeline. The CMOS process delivers low power consumption ideal for always-on appliances, while the OTP program memory gives designers stable firmware that cannot be read back through the external pins, providing a baseline level of code protection. Typical applications include white-goods and small-appliance control boards, automotive body modules (non-safety), industrial sensor front ends, simple user-interface panels, and consumer remote-control transmitters. The wide operating voltage also makes it appropriate for 5V-regulated industrial nodes. When designing with the PIC16C57C, allow adequate decoupling on VDD/VSS pairs, route MCLR with proper pull-up, and confirm the oscillator configuration matches the chosen resonator. OTP parts require pre-production verification via a windowed (JW) counterpart before committing the final code. This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and engineering design notes that go beyond the information in the bare datasheet, helping engineers shorten sourcing and BOM decisions.

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PIC16C57C-04I/P - 8-Bit 4MHz OTP MCU 28-PDIP | Microchip
PIC16C57C-04I/P

PIC16C57C-04I/P - 8-Bit 4MHz OTP MCU 28-PDIP | Microchip

The Microchip Technology PIC16C57C-04I/P is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, delivering 4MHz operation, 3KB (2K x 12) of One-Time-Programmable (OTP) program memory, and 20 digital I/O pins housed in a 28-pin PDIP package. The '04' speed grade corresponds to a 4MHz oscillator input and 100ns instruction cycle time. The 'I' suffix denotes the industrial temperature range of -40C to +85C, and the 'P' suffix denotes the through-hole PDIP-28 package. What is an OTP microcontroller? An OTP microcontroller integrates non-volatile program memory (EPROM-based, programmable once) directly on-chip alongside the CPU core, RAM, and peripherals. OTP microcontrollers sit within the broader taxonomy of microcontroller (MCU) -> embedded controller -> semiconductor, and historically served as the lowest-cost path to volume production before flash-based MCUs became ubiquitous. The PIC16C5X family uses a RISC architecture with 33 single-word, single-cycle instructions and a 12-bit instruction word with an 8-bit data path. Key features of the PIC16C57C-04I/P include 72 bytes of RAM, two-level deep hardware stack, 8-bit real-time clock/counter (TMR0), watchdog timer, power-on reset, and seven or eight special function hardware registers. The device supports direct, indirect, and relative addressing modes for both data and instructions. All PIC16C5X devices are fully static, allowing the clock to be stopped for power-saving sleep states without losing register contents. The PIC16C57C architecture uses a Harvard-style memory layout that separates program and data buses. With its 12-bit instruction width and 2:1 code compression versus competitors in its class, the device delivers high code density. The 28-pin PDIP package provides generous I/O headroom for legacy industrial control, automotive (non-safety), and appliance applications where through-hole assembly is preferred for hand-prototyping and field serviceability. Typical applications include low-cost embedded control for appliances, automotive body electronics, industrial control modules, simple sensor interfaces, and educational/development platforms. The OTP memory suits medium-volume production runs where firmware is fixed and field firmware updates are not required. Industrial-grade temperature range supports factory-floor deployments. When designing with this device, consider the OTP memory limitation carefully: code bugs cannot be patched in-circuit. Plan for a development flow using windowed (JW) or UV-erasable parts for prototyping, then move to the OTP 'C' variant for production. Ensure adequate decoupling (100nF ceramic plus bulk) on VDD, and respect the maximum I/O source/sink ratings of 25mA per pin. This page synthesizes distributor pricing, drop-in alternative listings, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C57C-20/P - 8-Bit 20MHz 3KB OTP MCU | Microchip 28-PDIP
PIC16C57C-20/P

PIC16C57C-20/P - 8-Bit 20MHz 3KB OTP MCU | Microchip 28-PDIP

The Microchip Technology PIC16C57C-20/P is an 8-bit CMOS microcontroller in the PIC16C5x family, featuring a 20 MHz maximum clock, 3 KB (2K x 12) of One-Time-Programmable (OTP) program memory, 72 bytes of data RAM, and 20 general-purpose digital I/O pins, housed in a 28-pin PDIP (0.600 in / 15.24 mm) through-hole package. The 'C' suffix denotes the CMOS process revision, while '20' indicates the 20 MHz maximum operating frequency and 'P' specifies the PDIP package. An 8-bit microcontroller (MCU) is a small, self-contained computing system on a single integrated circuit, integrating an 8-bit CPU core, program memory (ROM/EPROM/OTP/Flash), data RAM, peripheral interfaces, and I/O pins. Within the broader semiconductor taxonomy, an MCU sits inside the microcontroller -> embedded computing -> digital IC hierarchy. The PIC16C5x family specifically uses a RISC architecture with 33 single-word instructions and a 12-bit-wide instruction word, achieving 2:1 code compression versus competing 8-bit MCUs in its price class. It is part of the PIC architecture family, which is widely used in cost-sensitive, deterministic control applications. Key differentiating specifications include a 100 ns instruction execution time at 20 MHz, a two-level deep hardware stack, 8-bit real-time clock/counter (TMR0), and seven or eight special-function hardware registers. Addressing modes cover direct, indirect, and relative addressing for both data and instructions. Power consumption is held to a few milliamps at full speed thanks to the static CMOS core, with further reductions possible by lowering the clock frequency or using sleep/idle modes. The PIC16C57C-20/P is built on a fully static CMOS process, meaning the clock can be stopped and the device will retain state with negligible power draw - useful for battery-backed or interrupt-driven designs. The RISC-style 33-instruction set simplifies code generation and eases legacy support, while the OTP program memory allows fast prototype-to-production migration without the tooling overhead of windowed EPROM parts. Industrial and automotive-grade variants exist within the wider PIC16C5x line. Typical applications include appliance control (washing machines, microwave ovens, fan controllers), automotive subsystems (interior lighting, simple sensor interfaces), industrial control panels, low-cost remote controls, security keypads, and small embedded sensor conditioning boards. The 20 MHz CPU and 20 I/O lines cover most simple-to-mid complexity embedded control tasks. When designing with the PIC16C57C-20/P, ensure the OTP programming step is part of your production flow, as OTP parts cannot be erased or re-programmed. A 0.1 uF decoupling capacitor close to VDD is mandatory, and unused I/O should be configured as outputs low to minimize current draw. For new designs, evaluate the Flash-based PIC16F57-I/P successor first to gain reprogrammability and in-circuit debugging. This page synthesizes distributor stock levels, same-brand and cross-brand drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet alone.

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PIC16C57C-20/SO - 8-Bit 20MHz 3KB OTP MCU | Microchip
PIC16C57C-20/SO

PIC16C57C-20/SO - 8-Bit 20MHz 3KB OTP MCU | Microchip

The Microchip Technology PIC16C57C-20/SO is an 8-bit CMOS OTP-based microcontroller in the PIC16C5X family, delivering 20MHz maximum clock speed with 100ns instruction execution and 3KB (2K x 12) of one-time-programmable program memory in a 28-pin SOIC package. The device uses a RISC architecture with only 33 single-word/single-cycle instructions, providing 2:1 code compression over competing 8-bit microcontrollers in its class and up to 20 I/O lines for peripheral interfacing. It integrates 72 bytes of RAM, a 12-bit instruction word, and operates over the commercial temperature range typical for embedded control. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory (ROM/OTP/Flash), data RAM, and integrated peripherals. Within the broader hierarchy, microcontrollers belong to the embedded computing family, which also includes microprocessors, DSPs, and SoCs. The PIC16C5X family occupies the entry-level 8-bit RISC position in Microchip's portfolio, sitting below the PIC16F (Flash), PIC18 (enhanced 8-bit), and dsPIC (16-bit DSC) families. One-time-programmable (OTP) EPROM-based MCUs like the PIC16C57C are designed for high-volume production where firmware is finalized and field-reprogramming is not required. Key features of the PIC16C57C-20/SO include a fully static CMOS design supporting DC to 20MHz operation, 8-bit data width with 12-bit instruction width, 72 bytes of general-purpose RAM, a watchdog timer for reliable operation, a power-on reset circuit, and a code-protection feature for firmware security. The 28-SOIC package is suitable for surface-mount assembly in volume manufacturing, and the device is widely adapted for automotive, industrial, and consumer applications. Architecturally, the PIC16C57C uses a Harvard-style memory architecture with separate program and data paths. The 12-bit instruction word enables direct addressing of the full 2K x 12 program memory without paging, while the RISC instruction set keeps most operations single-cycle. This combination delivers deterministic interrupt latency and a compact code footprint. Typical applications include automotive subsystems, industrial controllers, appliance control, security panels, and consumer electronics that benefit from the proven PIC architecture and the low unit cost of OTP memory. The 20 I/O pins make it suitable for keyboard scanning, LED driving, relay control, and simple sensor interfaces. When designing with this part, note that OTP memory cannot be rewritten after programming - the device is intended for production designs where firmware is fully validated before mask programming. Use the JW windowed variant for engineering development.

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PIC16C57C-20/SP - 8-bit OTP MCU, 3KB, 20MHz, 28-SPDIP | Microchip
PIC16C57C-20/SP

PIC16C57C-20/SP - 8-bit OTP MCU, 3KB, 20MHz, 28-SPDIP | Microchip

The Microchip Technology PIC16C57C-20/SP is an 8-bit CMOS OTP-based microcontroller from the PIC16C5X family, packaged in a 28-pin SPDIP (Skinny Plastic DIP) through-hole package. It executes instructions in 100 nanoseconds at a 20 MHz external clock and integrates 3 KB of OTP program memory (2K x 12 words), 72 bytes of data RAM, and 20 digital I/O pins. The device uses a 12-bit wide instruction word and an 8-bit data path, with 33 single-word instructions providing 2:1 code compression over competing 8-bit MCUs of its era. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals onto one die, intended for embedded control tasks. Within the taxonomy, MCUs sit under microcontrollers -> 8-bit microcontrollers -> general-purpose embedded controllers -> semiconductor ICs. The PIC16C5X family pioneered Microchip's RISC-style instruction set and remains popular for cost-sensitive, deterministic bit-manipulation applications where code density and low part count matter more than raw throughput. Key features of the PIC16C57C-20/SP include a two-level deep hardware stack, direct/indirect/relative addressing modes for both data and instructions, an 8-bit real-time clock/counter (TMR0) with programmable prescaler, and a watchdog timer for unattended operation. Operating supply voltage spans 4.5 V to 5.5 V (commercial 0 C to +70 C range for the -20/SP speed grade), and I/O pins can source/sink 20 mA for direct LED or relay drive. The OTP memory allows one-time field programming, making this part well suited for low-to-medium volume production. Typical applications include automotive body controllers, industrial appliance control, security panels, and remote sensor transmitters where the deterministic 100 ns instruction cycle and 33-instruction RISC core simplify firmware while keeping BOM cost minimal. The 28-pin SPDIP footprint is breadboard-friendly and supports hand-soldered prototyping as well as wave-soldered assembly. When designing with this part, note that OTP precludes firmware upgrades; budget development effort for ROM emulator (ICE) verification or sample-window pre-production testing. For designs needing in-system reprogrammability, prefer the flash-based PIC16F57 successor or the PIC16F628A family which drop into similar footprints. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C57C-20E/SO - 8-Bit 20MHz OTP MCU 3KB | Microchip
PIC16C57C-20E/SO

PIC16C57C-20E/SO - 8-Bit 20MHz OTP MCU 3KB | Microchip

The Microchip Technology PIC16C57C-20E/SO is a CMOS OTP-based 8-bit microcontroller from the PIC16C5X family, executing instructions in 200 ns (5 MHz oscillator) or 100 ns (20 MHz oscillator) per instruction cycle. It integrates 3KB (2K x 12) of One-Time-Programmable program memory, 72 bytes of RAM, and up to 20 digital I/O pins in a 28-pin SOIC (7.50 mm / 0.295 inch) wide-body package. The device is rated for industrial extended temperature operation (-40C to +125C) and operates from 3.0 V to 5.5 V supply. An OTP (One-Time-Programmable) microcontroller is a class of non-volatile programmable logic device that uses EPROM cells to store firmware; unlike flash-based MCUs, OTP memory cannot be electrically erased and is intended for volume production where code is finalized. The PIC16C57C belongs to the baseline PIC architecture (RISC, 33 single-word instructions, 12-bit instruction word) and slots below PIC16F and PIC18 enhanced families. In the broader taxonomy it is an 8-bit microcontroller -> embedded MCU -> semiconductor IC, historically used in low-cost, high-volume appliance, automotive, and industrial control applications. Key features include 20 MHz maximum operating frequency, 20-bit instruction word with 2:1 code compression versus competing 8-bit MCUs, hardware watchdog timer, power-on reset, brown-out detection, and programmable code protection. The CMOS design draws only 2 mA typical at 5V/20 MHz and supports standby current down to 1 uA. The PIC16C57C uses a Harvard architecture with separate program and data buses, enabling single-cycle instruction fetch and execution. Its 12-bit-wide instruction set is symmetric and orthogonal, simplifying assembly coding. The RISC core delivers approximately 5 MIPS peak throughput at 20 MHz - an order-of-magnitude advantage over contemporaries in its price class. Typical applications include automotive body controllers, industrial timers and counters, appliance control boards, security keypads, low-end sensor readers, and remote-control transmitters. The wide operating voltage and temperature make it suitable for harsh environments. When designing with the PIC16C57C-20E/SO, account for the OTP constraint: firmware must be fully verified before programming, as there is no in-circuit erase. Use the extended-temperature E suffix for industrial deployments; for commercial-grade deployments the PIC16C57C-20/SO (non-E) is acceptable. Programming requires Microchip-compatible device programmers supporting the PIC16C5X family. This page consolidates distributor pricing, pin-compatible drop-in alternatives, application guidance, and package information for engineers evaluating or sourcing the PIC16C57C-20E/SO. All data cross-referenced against Microchip's PIC16C5X datasheet and current distributor inventory.

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PIC16C57C-20E/SP - 8-Bit 20MHz OTP MCU, 28-SPDIP | Microchip
PIC16C57C-20E/SP

PIC16C57C-20E/SP - 8-Bit 20MHz OTP MCU, 28-SPDIP | Microchip

The Microchip Technology PIC16C57C-20E/SP is a member of the PIC16C5X family of low-cost, high-performance 8-bit CMOS EPROM/ROM-based microcontrollers delivering 20 MHz maximum operating frequency with 100 ns instruction execution in a 28-pin SPDIP (SPD) through-hole package. It integrates 3 KB (2K x 12) of one-time-programmable (OTP) program memory, 72 bytes of RAM, and 33 single-word instructions in a RISC architecture optimized for compact code density. 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 die. The PIC16C5X family belongs to the broader PIC® architecture -> 8-bit microcontroller -> microcontroller -> embedded controller -> semiconductor device hierarchy. OTP-based PIC devices occupy a specific niche in this taxonomy: they are mask-ROM-equivalent in pinout and firmware behavior, but the program memory can be written once by the user with a standard programmer, making them ideal for low-volume production, prototype runs, and legacy field replacements. Key features include 20 MHz maximum clock, 4 oscillator selections (RC, LP, XT, HS), 20 I/O pins, an 8-bit timer/counter, watchdog timer with on-chip RC oscillator, power-on reset, power-saving SLEEP mode, code protection, and 4.5V to 5.5V operating voltage. The '20E' suffix indicates 20 MHz speed grade with the extended (-40C to +125C) automotive temperature range, while the /SP suffix denotes the 28-pin 0.300-inch Skinny Plastic DIP package supplied in tube. The PIC16C5X employs a Harvard architecture with separate program and data buses, a 12-bit-wide instruction word, and a 2-level deep hardware stack. Compared to 8-bit CISC competitors in its era, this delivers roughly 2:1 code compression, allowing more application functionality within the limited 2K-word OTP. The device is fully static, supporting operation below 20 MHz down to DC, and includes on-chip brown-out and power-on reset circuitry for robust cold-start behavior in industrial environments. Typical applications include automotive subsystems (sensor interfaces, simple control loops), industrial appliance control (washing machines, HVAC damper drivers), security and alarm panels, remote transmitters, low-end consumer electronics, and any field-replacement scenario where the original OTP code must be replicated exactly. The wide temperature range makes the -20E grade especially suited for under-hood automotive and outdoor industrial installations. When designing with this device, ensure the chosen oscillator mode matches the external crystal or resonator network; an HS-mode crystal with improper load capacitance can cause intermittent startup failures. Note that OTP memory cannot be erased - for in-system reprogrammability, migrate to the flash-based PIC16F57 drop-in equivalent. Always place a 0.1 uF decoupling capacitor within 5 mm of VDD with a short trace to ground. This page synthesizes distributor pricing, automotive-grade temperature range, drop-in PIC16F57 alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16C57C-20E/SS - 8-bit OTP MCU, 3KB EPROM, 20MHz | Microchip
PIC16C57C-20E/SS

PIC16C57C-20E/SS - 8-bit OTP MCU, 3KB EPROM, 20MHz | Microchip

The Microchip Technology PIC16C57C-20E/SS is an EPROM/ROM-based 8-bit CMOS microcontroller from the PIC16C5X family, delivering 100 ns instruction execution with only 33 single-word instructions in a 28-pin SSOP package. It integrates 3 KB of OTP program memory, 72 bytes of RAM, and 20 digital I/O pins, runs at a maximum 20 MHz clock (the "-20" speed grade), and operates from a 4.5 V to 5.5 V supply. What is a PIC16C5X microcontroller? The PIC16C5X is a family of low-cost, high-performance, 8-bit fully static EPROM/ROM-based CMOS microcontrollers from Microchip Technology that introduced the PIC RISC architecture to a broad base of 8-bit embedded designs. These parts belong to the broader hierarchy: microcontroller -> embedded MCU -> 8-bit MCU -> CMOS MCU -> RISC MCU -> semiconductor IC. They target applications that need deterministic, simple instruction flow rather than the largest memory map, and they predate the PIC16F flash family while remaining software and pin-compatible with later PIC16F5X replacements. Key features include a 12-bit wide instruction set that achieves 2:1 code compression versus other 8-bit microcontrollers in its class, a hardware watchdog timer, power-on reset, and a brown-out reset block, plus an 8-bit real-time clock/counter. The device is specified for the extended automotive temperature range (-40C to +125C), as indicated by the "E" designator, and ships in a 28-pin SSOP (5.30 mm body) gull-wing surface-mount package. The "C" suffix marks the CMOS "C" revision with the higher 20 MHz ceiling. Architecturally, the PIC16C57C uses a Harvard-style separate code and data path, a 2-level deep hardware stack, and direct/indirect addressing modes for all 80 general-purpose registers. The OTP EPROM lets engineers code-protect each address location individually, which is a benefit over mask-ROM parts for low-volume and field-updateable products. Typical applications include automotive body and chassis controllers, industrial sensor interfaces, low-cost consumer appliances, security and access-control panels, and any 5V logic replacement board where legacy PIC code is being re-used on a modern PCB. When designing with the PIC16C57C, allocate the 2-level hardware stack carefully because it limits interrupt-less call depth, and place a 0.1 uF decoupling capacitor within 5 mm of each VDD pin. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16C57C-20I/P - 8-bit 20MHz OTP MCU 3KB | Microchip
PIC16C57C-20I/P

PIC16C57C-20I/P - 8-bit 20MHz OTP MCU 3KB | Microchip

The Microchip Technology PIC16C57C-20I/P is an 8-bit RISC CMOS OTP microcontroller delivering up to 20 MHz maximum clock speed in a 28-pin PDIP (Plastic Dual-In-Line) through-hole package. It integrates 3KB (2K x 12) of One-Time-Programmable (OTP) program memory and 72 bytes of general-purpose SRAM, with 20 digital I/O pins. The "I" suffix denotes the industrial temperature grade of -40C to +85C, while "-20" specifies the 20 MHz maximum operating frequency and "/P" denotes the PDIP package. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash/OTP), data RAM, and programmable I/O peripherals. The PIC16C5X family belongs to the broader 8-bit MCU category, which sits beneath 16-bit and 32-bit MCUs in the embedded computing hierarchy. 8-bit OTP MCUs like the PIC16C57C are designed for cost-sensitive, high-volume embedded control where code is finalized at production time and does not require field updates - common in appliances, toys, and industrial sensor nodes. Key features include a 12-bit instruction word for 2:1 code compression versus competing 8-bit architectures, only 33 single-word instructions for fast learning curve, 100 ns instruction execution time at 20 MHz, and a two-stack hardware subroutine return stack. The device supports both RC and crystal/ceramic resonator oscillator modes, watchdog timer with on-chip RC oscillator, and programmable code protection. The PIC16C57C uses a Harvard architecture with separate program and data buses, eliminating fetch-decode bottlenecks. Its 12-bit wide instruction set is symmetrical and orthogonal, allowing any register to act as an accumulator or address pointer. Power-on Reset (POR), Power-up Timer (PWRT), and Oscillator Start-up Timer (OST) ensure clean cold-start behavior without external reset circuitry. Typical applications include appliance control (washing machines, microwaves), automotive sub-systems (sensor interfaces, simple body controllers), industrial timers and counters, remote controls, and battery-powered sensor nodes. The 20 I/O lines comfortably drive LED arrays, keypads, and low-speed serial interfaces. When designing, allow for OTP one-time programming by using a production programmer and plan code carefully - there is no in-system reprogramming. Use the watchdog timer for unattended industrial deployments and follow Microchip's recommended decoupling (0.1 uF ceramic on VDD) plus bulk electrolytic on the board supply rail. This page synthesizes distributor pricing, verified drop-in alternatives from the same PIC16C5X family, and practical design notes not aggregated in any single manufacturer page, giving procurement and design engineers a faster path to sourcing and migrating legacy 8-bit designs.

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PIC16C57C-20I/SO - 8-Bit 20MHz OTP MCU 3KB | Microchip
PIC16C57C-20I/SO

PIC16C57C-20I/SO - 8-Bit 20MHz OTP MCU 3KB | Microchip

The Microchip Technology PIC16C57C-20I/SO is an 8-bit CMOS OTP (One-Time-Programmable) microcontroller in the PIC16C5X family, delivering 20 MHz CPU performance with 100 ns instruction execution in a 28-pin SOIC package. It integrates 3 KB (2K x 12) of OTP program memory, 72 bytes of RAM, and 20 digital I/O lines, all rated for industrial temperature operation (-40C to +85C). An 8-bit OTP microcontroller is a single-chip computer whose program memory is a one-time-programmable EPROM-style array - the device is programmed once at production and cannot be re-flashed, which makes it cost-optimized for high-volume embedded products that do not need firmware updates in the field. Within the broader taxonomy, the PIC16C57C belongs to the microcontroller (MCU) family, then 8-bit MCUs, then the PIC architecture lineage, then power management and digital control ICs, then semiconductors. It targets applications where predictable cost, simple programming model, and proven RISC performance outweigh the need for in-system reprogrammability. Key features include a Harvard RISC architecture with only 33 single-word instructions, a two-level deep hardware stack, and seven or eight special-function hardware registers. Peripherals include an 8-bit real-time clock/counter (TMR0), a watchdog timer, and direct, indirect, and relative addressing modes. The 20 MHz oscillator supports instruction cycles as fast as 200 ns in the -20 speed grade. The PIC16C57C uses a 12-bit instruction word with an 8-bit data path, yielding 2:1 code compression versus competing 8-bit MCUs of its era. Its fully static CMOS design minimizes power consumption, and the SOIC-28 footprint provides drop-in compatibility with other PIC16C5X family members (PIC16C54/55/56/57). The 'C' suffix denotes an enhanced silicon revision with improved electrical characteristics. Typical applications include automotive body controllers, industrial appliance controls, low-end consumer electronics, sensor interfaces, and battery-powered smart devices. It is also commonly deployed in replacement designs for legacy PIC16C5X systems where proven OTP architecture and broad second-source availability matter. When designing with this MCU, allocate the WDT, reset, and I/O pin budgets early - the PIC16C57C has a fixed 20 I/O count with no remapping. Engineers migrating to flash should evaluate the pin-compatible PIC16F57 family as a one-to-one drop-in. This page consolidates distributor pricing, drop-in same-package alternatives, application context, and practical design guidance not bundled in the manufacturer datasheet.

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PIC16C57C-20I/SP - 8-bit 20MHz OTP MCU, 3KB | Microchip
PIC16C57C-20I/SP

PIC16C57C-20I/SP - 8-bit 20MHz OTP MCU, 3KB | Microchip

The Microchip Technology PIC16C57C-20I/SP is an 8-bit CMOS OTP-based microcontroller built on the PIC16C5X family architecture, delivering 20MHz (200ns instruction cycle) performance in a 28-pin SPDIP through-hole form factor. Per the Microchip PIC16C57C datasheet, this industrial-temperature (-40C to +85C) device integrates 3KB (2K x 12) of one-time-programmable program memory, 72 bytes of RAM, and a 2-level hardware stack for compact embedded designs. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals on one silicon die. The PIC16C5X architecture is a RISC-style Harvard design with 33 single-word instructions, 12-bit-wide opcodes, and 8-bit-wide data paths. This results in roughly 2:1 code compression versus typical 8-bit CISC competitors in the same price class. The device sits within the broader microcontroller -> embedded MCU -> semiconductor taxonomy, and the OTP variant is intended for low-to-medium-volume production where in-system reprogrammability is not required. Key features include 20 I/O pins, an 8-bit real-time clock/counter (TMR0) with programmable prescaler, direct/indirect/relative addressing modes, seven or eight special function hardware registers, and a power-on reset (POR) circuit. The wide 2.7V-5.5V VDD range and low-power CMOS process make the part well-suited to battery-influenced and industrial applications. The 28-pin SPDIP package is the industry-standard through-hole profile that simplifies prototyping on breadboards and through-hole production boards. In depth, the PIC16C57C uses a 12-bit program-word, 8-bit data-path, 2-level-deep hardware stack that limits call depth (no nested interrupts by default). It supports 4 oscillator modes (RC, LP, XT, HS), allowing designers to trade cost vs frequency. Watchdog timer, power-saving SLEEP mode, and programmable code protection round out the feature set. The -20 speed grade variant guarantees 20MHz operation over the full industrial temperature range, whereas slower -04 and -10 grades are typically used for cost-sensitive designs. Typical applications include industrial control, automotive subsystems (post-screening by customer), appliance control, low-end consumer electronics, security alarm panels, and legacy replacement designs. The 8-bit PIC16C5X core remains popular in cost-sensitive, deterministic real-time control where interrupt latency predictability is more important than raw throughput. When designing with this part, note that OTP means firmware is committed at the time of programming and cannot be field-updated. Use the JW windowed package for prototype iteration, and consider a Flash-based PIC16F equivalent (e.g. PIC16F57) if in-application reprogrammability is needed. This page consolidates distributor pricing, parametric drop-in alternatives within the PIC16C5X family, and practical design notes not collected in any single manufacturer document.

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PIC16C57C-20I/SS - 8-Bit 20MHz 3KB OTP MCU | Microchip
PIC16C57C-20I/SS

PIC16C57C-20I/SS - 8-Bit 20MHz 3KB OTP MCU | Microchip

The Microchip Technology PIC16C57C-20I/SS is an 8-bit RISC CMOS microcontroller with 20 MHz maximum clock, 3 KB (2K x 12) of One-Time-Programmable (OTP) program memory, 72 bytes of RAM, and 20 digital I/O pins, housed in a 28-pin SSOP (Shrink Small Outline Package). It executes one instruction every 200 ns (5 MIPS) and features a 12-bit wide instruction word with 8-bit data path, a two-level deep hardware stack, and a single 8-bit timer/counter (TMR0). An 8-bit OTP microcontroller is a programmable logic device that stores its application code in non-volatile One-Time-Programmable memory instead of flash; once programmed, the code cannot be rewritten. The PIC16C57C belongs to the PIC16C5X family, which sits within Microchip's classic PIC mid-range 8-bit microcontroller taxonomy (8-bit MCU -> RISC microcontroller -> embedded controller -> semiconductor). This 5X family was the original low-cost, high-performance PIC architecture that established Microchip in the 8-bit MCU market. Key features include 33 single-word instructions for easy programming, direct/indirect/relative addressing modes for both data and instructions, 8-bit real-time clock/counter (TMR0) with 8-bit prescaler, power-on reset, watchdog timer for reliable operation, and code protection to safeguard intellectual property. The C-grade silicon revision also adds improved oscillator tolerance and lower power consumption versus the original PIC16C57A baseline. Architecturally, the PIC16C57C uses a Harvard-style RISC core with separate program and data buses, enabling simultaneous instruction fetch and operand access. The OTP EPROM cell is fabricated in CMOS for low static current draw, while the 12-bit instruction width gives 2:1 code compression versus competing 8-bit MCUs that use 16-bit instruction words. Industrial temperature grade (-40C to +85C) ensures operation in harsh environments. Typical applications include automotive body electronics, industrial control systems, appliance controls, security and alarm panels, simple sensor interfaces, and consumer products. The 20 I/O pins make it suitable for keypad scanning, LED driving, and relay control. With its 100 ns instruction execution time, it offers an order-of-magnitude higher performance than competitors in the same price category. When designing with the PIC16C57C-20I/SS, remember that OTP memory requires programming before insertion; design for programming socket access or in-circuit programming. The 28-SSOP package is suitable for space-constrained applications. Use the watchdog timer to recover from software lockups, and apply proper decoupling (0.1 uF ceramic) near VDD to suppress switching noise. This page synthesizes distributor pricing, drop-in OTP variants, and practical design notes that go beyond the manufacturer datasheet, giving engineers a one-stop reference for sourcing and integrating the PIC16C57C-20I/SS.

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PIC16C57C-40/P - 8-Bit OTP MCU, 2KB EPROM, 40MHz, 28-DIP | Microchip
PIC16C57C-40/P

PIC16C57C-40/P - 8-Bit OTP MCU, 2KB EPROM, 40MHz, 28-DIP | Microchip

The Microchip Technology PIC16C57C-40/P is a CMOS OTP-based 8-bit microcontroller from the PIC16C5X family, delivering 100 nanosecond instruction execution at 40 MHz, packaged in a 28-pin PDIP (DIP-28) through-hole form factor. It integrates 2KB (2K x 12) of one-time-programmable EPROM program memory, 72 bytes of RAM, and 20 I/O pins arranged across multiple ports (RA, RB, RC). The device operates from 3.0V to 5.5V and is offered in a -40C to +85C industrial temperature grade. A PIC microcontroller is an 8-bit RISC-based Harvard-architecture MCU that uses separate program and data buses, allowing instruction fetch and operand access to occur in the same clock cycle. The PIC16C5X series is the entry-tier of Microchip's original PIC portfolio and sits in the broader taxonomy: 8-bit microcontroller -> RISC microcontroller -> microcontroller -> embedded processor -> semiconductor. Its 33 single-word, single-cycle instruction set makes it simple to program in assembly while keeping code density exceptionally high thanks to the 12-bit-wide instruction word. Key features of the PIC16C57C-40/P include a programmable 8-bit timer/counter (TMR0) with an 8-bit prescaler, watchdog timer with its own on-chip RC oscillator for reliable resets, power-on reset, brown-out detection, and a four-stage instruction pipelining engine. The 40 MHz internal clock (10 MHz external oscillator with 4x PLL multiplier) yields 100 ns instruction cycle time, enabling tight deterministic control loops for cost-sensitive real-time applications. The PIC16C57C architecture uses a 12-bit program counter and dedicated W (working) register, with file registers organized into two banks. The OTP EPROM allows field programming of code via standard Microchip programmers such as the PICSTART Plus or PRO MATE II, supporting in-house development cycles for low-to-medium volume products. Its CMOS process keeps supply current low, extending battery life in portable or always-on designs. Typical applications include appliance control, automotive body electronics, low-end remote keyless entry, security keypads, sensor interface modules, and small industrial controllers. Because the program memory is OTP rather than flash, the PIC16C57C is best suited for high-volume mature products where code is finalized and field re-programming is not required. For new designs requiring flash reprogrammability, the PIC16F57 or PIC16F59 family is the recommended modern equivalent. When designing with the PIC16C57C-40/P, place a 0.1 uF decoupling capacitor as close as possible to VDD (pin 28) and a bulk 10 uF tantalum or aluminum electrolytic on the same node. A series resistor (typically 4.7 kohm to 10 kohm) on MCLR allows in-circuit serial programming while preventing unintended resets. Unused I/O pins should be configured as outputs and tied low to minimize current consumption. This page synthesizes distributor pricing, drop-in alternatives from Microchip's own PIC16C5X family, and practical design notes not found in the manufacturer datasheet alone.

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