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PIC16C57-HSE/P - 8-bit OTP MCU, 3KB EPROM, 20 I/O, 28-PDIP | Microchip
PIC16C57-HSE/P

PIC16C57-HSE/P - 8-bit OTP MCU, 3KB EPROM, 20 I/O, 28-PDIP | Microchip

The Microchip Technology PIC16C57-HSE/P is an 8-bit RISC microcontroller from the PIC16C5X baseline family, featuring 3KB of one-time-programmable (OTP) EPROM program memory, 72 bytes of RAM, and 20 digital I/O pins in a 28-pin PDIP through-hole package. The "HSE" speed suffix denotes a high-speed oscillator variant operating up to 20 MHz with a 200 ns instruction cycle, and the "/P" suffix indicates the plastic DIP package supplied in tube packaging. This device runs from a 3.0V to 6.0V supply and is specified for the commercial 0C to +70C temperature range. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and configurable I/O peripherals onto one silicon die. The PIC16C5X family sits at the low-cost, low-pin-count end of Microchip's PIC baseline architecture and is widely used in cost-sensitive embedded applications. Within the broader taxonomy, PIC microcontrollers belong to the RISC microcontroller category, which contrasts with CISC architectures by using a small, fixed-length instruction set that executes most instructions in a single cycle. The 12-bit-wide instruction set enables 2:1 code compression over typical 8-bit CISC MCUs, allowing more functionality in less program memory. Key features of the PIC16C57-HSE/P include a 33-instruction set, a two-level hardware stack, 8-bit timer/counter with 8-bit prescaler, watchdog timer with on-chip RC oscillator for reliable operation, power-on reset, and brown-out detection. The 20 I/O pins can be individually configured for input or output and can source/sink up to 20 mA per pin, making them capable of directly driving LEDs and small relays. The high-speed 20 MHz operation delivers 5 MIPS of throughput, suitable for simple control loops and user-interface scanning tasks. Architecturally, the PIC16C57-HSE/P uses a Harvard architecture with separate program and data buses, allowing simultaneous instruction fetch and operand access. The EPROM-based program memory enables prototyping and low-volume production, but cannot be electrically erased, so OTP programming is final. In-circuit serial programming (ICSP) is supported via RB6/RB7 pins, simplifying firmware loading on the production line. Typical applications include simple consumer appliances, remote controls, low-end toys, small appliances with keypad/LED user interfaces, sensor interface nodes, and legacy industrial controllers. The 20 I/O count and 3KB program memory comfortably handle a 4x4 keypad matrix scan, 7-segment LED multiplexing, and basic PID control loops. When designing with this device, plan the OTP programming process early: once programmed, OTP cannot be erased, so firmware bugs in production parts cannot be recovered. Use a windowed PIC16C57-JW variant for engineering development so the same die can be UV-erased and re-programmed during code iteration.

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PIC16C57-HSE/SO - 8-Bit 16MHz 3KB OTP MCU 28-SOIC | Microchip
PIC16C57-HSE/SO

PIC16C57-HSE/SO - 8-Bit 16MHz 3KB OTP MCU 28-SOIC | Microchip

The Microchip Technology PIC16C57-HSE/SO is an 8-bit RISC microcontroller from the PIC16C5X family, featuring a 16 MHz maximum clock speed, 3 KB of One-Time-Programmable (OTP) program memory organized as 2K x 12 words, and 72 bytes of data RAM, all housed in a 28-pin Small Outline Integrated Circuit (SOIC) package. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals. An 8-bit MCU like the PIC16C57 processes data 8 bits at a time and is widely used in cost-sensitive embedded applications where deterministic performance and low power are more critical than raw throughput. Within the broader semiconductor hierarchy, an MCU is a sub-category of microcontrollers, which sit under integrated circuits (ICs) and the wider power management and digital logic taxonomy. PIC16C5X devices use a Harvard architecture with separate program and data buses, enabling single-cycle instruction execution except for program branches. Key features of the PIC16C57-HSE/SO include a Harvard RISC architecture with 33 single-word instructions, a 12-bit wide instruction set providing 2:1 code compression over competing 8-bit MCUs, 20 I/O pins with individual direction control, a watchdog timer for reliable operation, and a power-on reset (POR) circuit. The device operates from a 4.5V to 5.5V supply and includes a high-speed 16 MHz external oscillator mode (the "HSE" suffix designates this 16 MHz high-speed crystal/oscillator variant). It supports operating temperatures typical of automotive and industrial grade environments. The PIC16C57's EPROM/OTP program memory architecture allows one-time programming for low-to-mid volume production, and the 16 MHz clock gives an instruction cycle of 250 ns (4 clock periods per instruction cycle). Power management features include a sleep mode that reduces quiescent current dramatically, plus a programmable code-protection scheme that prevents unauthorized memory reads. The 28-SOIC package is industry-standard and easy to hand-solder, making the part attractive for prototyping and small-batch builds. Typical applications include automotive body controllers, appliance control boards, simple sensor interfaces, low-end remote controls, LED driver controllers, and industrial timers. The PIC16C57 is also common in legacy industrial equipment and educational platforms because of its long product history and mature tool chain. When designing with the PIC16C57-HSE/SO, engineers should plan for OTP programming only once per device; for development, use a windowed (JW) package or the pin-compatible PIC16C57C flash variants. Because OTP memory cannot be erased, allocate spare program memory for late-stage bug fixes. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, providing an engineering-focused view beyond what the datasheet or distributor catalog offers.

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PIC16C57-HSE/SP - 8-Bit 16MHz OTP MCU 3KB | Microchip
PIC16C57-HSE/SP

PIC16C57-HSE/SP - 8-Bit 16MHz OTP MCU 3KB | Microchip

The Microchip Technology PIC16C57-HSE/SP is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, operating at 16MHz with an external HS oscillator configuration and packaged in a 28-pin SPDIP (Skinny Plastic DIP) through-hole form factor. The HSE suffix denotes the high-speed external oscillator mode, the SP suffix denotes 28-pin SPDIP package, and the device is qualified to the automotive temperature grade. According to the Microchip product listing, the device integrates 3KB (2K x 12) of One-Time-Programmable (OTP) program memory and 72 bytes of RAM, with 20 general-purpose I/O pins split across two ports (RA and RB). An 8-bit PIC microcontroller (MCU) is a RISC-based single-chip computer that combines a CPU core, non-volatile program memory, working RAM, and programmable I/O peripherals on a single silicon die. PIC microcontrollers sit within the broader hierarchy of microcontroller -> embedded processor -> semiconductor IC. The PIC16C5X family specifically targets cost-sensitive, low-to-moderate-performance embedded applications where deterministic instruction execution, simple peripheral sets, and ROM/EPROM-based program storage provide the best price-to-performance ratio. The OTP variant allows one-time factory or in-circuit programming, which is typical for mature 8-bit designs with stable firmware. Key features include 33 single-word instructions, a 12-bit wide instruction word enabling 2:1 code compression over typical 8-bit CISC architectures, two 8-bit I/O ports, an 8-bit timer/counter (TMR0) with an 8-bit programmable prescaler, a Watchdog Timer (WDT) with on-chip RC oscillator for reliable recovery, and Power-On Reset (POR). The device supports an operating voltage range commonly cited as 3.0V to 6.25V across the PIC16C5X family, with low-power CMOS construction. Its 28-pin SPDIP package is through-hole, simplifying prototype and low-volume production assembly. Architecturally, the PIC16C57 uses a Harvard RISC core with separate program and data buses, a two-stage pipeline, and a single accumulator (W register) working model. The 16MHz maximum clock yields a 250ns instruction cycle, and the OTP memory is windowless, requiring UV erasure only for prototype parts (JW package). For production runs, OTP parts ship pre-programmed. The HSE oscillator mode allows use of high-frequency external crystals or oscillators, distinguishing it from HS (standard) and RC variants. Typical applications include automotive body controllers and appliance control, simple sensor signal conditioning, LED and relay driver sequencing, industrial timer/counter modules, low-cost consumer electronics, and legacy embedded control boards. The wide operating temperature range and OTP memory make it suitable for high-volume fixed-function products where firmware does not need field updates. When designing with this part, choose the HS oscillator mode for higher clock accuracy and select capacitors matched to the crystal load capacitance. Ensure unused I/O pins are configured as outputs to minimize power consumption and reduce noise susceptibility. For modern designs requiring in-field reprogrammability, consider migrating to the Flash-based PIC16F57 or PIC16F884 equivalents; the PIC16C57-HSE/SP is best suited for mature, frozen-firmware production runs. This page synthesizes real-time distributor pricing, pin-compatible same-family alternatives (PIC16C57-HSE/SO, PIC16C57-10I/P, PIC16C57-10E/SS), and practical design notes that go beyond the manufacturer datasheet.

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PIC16C57-HSE/SS - 8-Bit EPROM MCU, 3KB OTP, 20MHz, 28-SSOP
PIC16C57-HSE/SS

PIC16C57-HSE/SS - 8-Bit EPROM MCU, 3KB OTP, 20MHz, 28-SSOP

The Microchip Technology PIC16C57-HSE/SS is an 8-bit EPROM/ROM-based CMOS microcontroller with 3KB of one-time-programmable (OTP) program memory, packaged in a 28-pin SSOP (Shrink Small Outline Package). It operates from a 20 MHz external clock input (HSE = High-Speed External oscillator) and targets cost-sensitive embedded control applications requiring deterministic RISC execution. A microcontroller (MCU) is a single-chip computer containing a CPU, memory (ROM/RAM), and programmable I/O peripherals on one IC. Within the embedded electronics taxonomy, the PIC16C57 sits in the 8-bit MCU class -> RISC microcontroller -> embedded controller -> semiconductor. It is fully static, employs a RISC architecture with 33 single-word/single-cycle instructions, and offers 12-bit-wide instruction words with a 4-stage pipeline architecture characteristic of the original PIC16C5X baseline family. Key features include 72 bytes of RAM, 20 I/O pins, a hardware timer/counter, watchdog timer, and a wide operating voltage range. The HSE oscillator suffix indicates the part supports an external high-speed clock source, allowing the engineer to feed a crystal/oscillator up to 20 MHz for deterministic instruction-cycle timing. The /SS suffix denotes the 28-SSOP surface-mount package with 0.209" (5.30 mm) body width, which is pin-compatible with the PIC16C55 and PIC16C56 in the same family. Typical applications include low-cost appliance controllers, LED display drivers, remote controls, automotive body electronics (non-safety), and simple sensor interfacing. The OTP program memory makes it suited to production volumes where mask-ROM economies of scale are not justified. When designing, note that the PIC16C57 is a legacy 5V device with no on-chip debug or flash reprogramming; code must be committed at production time and the part requires a UV windowed variant (JW) for code iteration. Verify OTP programming equipment compatibility (e.g., MPLAB PM3) before committing to this part.

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PIC16C57-HSI/P - 8-Bit 20MHz OTP MCU, 3KB EPROM | Microchip
PIC16C57-HSI/P

PIC16C57-HSI/P - 8-Bit 20MHz OTP MCU, 3KB EPROM | Microchip

The Microchip Technology PIC16C57-HSI/P is an 8-bit RISC CMOS microcontroller running at 20 MHz with 3 KB (2K x 12) of one-time-programmable (OTP) EPROM program memory, 72 bytes of RAM, and 20 digital I/O lines, housed in a 28-pin PDIP (DIP-28, 0.600 inch) through-hole package. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, volatile working RAM, and configurable peripheral I/O onto one piece of silicon. The PIC16C5X series uses a 12-bit wide instruction word with an 8-bit data path, achieving roughly 2:1 code compression versus other 8-bit MCUs in its class. Within the broader taxonomy, this part belongs to: microcontroller -> 8-bit MCU -> PIC16 family -> PIC16C5x sub-family -> OTP EPROM variant -> RISC architecture -> CMOS semiconductor. The "HSI" suffix designates a high-speed crystal/oscillator variant rated for 20 MHz operation, while "/P" indicates the PDIP-28 plastic package. Key features include 33 single-word instructions (single-cycle except branches), a two-level hardware stack, direct/indirect/relative addressing modes, an 8-bit real-time clock/counter (TMR0) with programmable prescaler, power-on reset (POR), watchdog timer (WDT), and a programmable code-protect feature. Operating voltage spans 3.0 V to 5.5 V at industrial temperature range (-40C to +85C). All 20 I/O pins are bidirectional with individually programmable direction registers and high-current sink/source capability. Typical applications for the PIC16C57-HSI/P include embedded control boards, sensor interface modules, user-interface/keypad controllers, low-cost industrial automation nodes, and legacy system maintenance builds. Its high oscillator frequency makes it suited for applications requiring tighter timing loops than the lower-frequency RC variants (e.g., PIC16C57-RC/P, PIC16C57-LP/P) can deliver. When designing with this part, note that OTP EPROM cannot be electrically erased - firmware is finalized at programming time. For development cycles, use a windowed CERDIP (-JW) or flash-based PIC16F57 part instead. Decoupling VDD/VSS with 100 nF ceramic caps placed within 5 mm of the pins is recommended; MCLR must be pulled high through a 10 kohm resistor for normal operation. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C57-HSI/SO - 8-Bit 20MHz OTP MCU 3KB | Microchip
PIC16C57-HSI/SO

PIC16C57-HSI/SO - 8-Bit 20MHz OTP MCU 3KB | Microchip

The Microchip Technology PIC16C57-HSI/SO is an 8-bit CMOS microcontroller from the PIC® 16C family, featuring a 20MHz maximum CPU clock, 3KB (2K x 12) of One-Time-Programmable (OTP) program memory, and 72 bytes of RAM. It is housed in a 28-pin SOIC (7.50mm/0.295in width) surface-mount package with 20 I/O pins, optimized for cost-sensitive embedded control applications where deterministic performance and code density matter more than large memory footprints. A microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral I/O on one die. The PIC16C5X family specifically sits within the broader taxonomy of microcontrollers -> 8-bit microcontrollers -> CMOS microcontrollers -> RISC microcontrollers -> embedded controllers. Its Harvard architecture separates program and data buses, while 12-bit-wide instructions deliver roughly 2:1 code compression versus competing 8-bit CISC architectures, allowing more functionality in less program memory. Key features include a 20MHz high-speed internal oscillator variant (the HSI suffix denotes factory-programmed HS oscillator mode with internal clock options), 8-bit real-time clock/counter (TMR0), two-level deep hardware stack, and seven or eight special function hardware registers. The device supports direct, indirect, and relative addressing modes for both data and instructions, and operates from a single 5V supply over the commercial/industrial temperature range. The PIC16C57 architecture uses a fully static CMOS design, meaning the clock can be stopped without losing internal state. This makes it well suited for low-power or battery-friendly designs where the oscillator is duty-cycled. The 12-bit instruction set and 33 single-word/single-cycle instructions reduce program-memory pressure, while the two-level hardware stack constrains subroutine nesting to two levels, an important constraint for C or high-level-language users porting code. Typical applications include appliance control, sensor signal conditioning, LED drivers, simple motor control, remote keyless entry, security panels, and consumer white-goods user interfaces. The 20 I/O pins can directly drive LEDs, sink relays via transistors, and read keypad matrices, making the device a versatile general-purpose controller. When designing with this part, observe the OTP programming limitation: the device cannot be re-flashed after programming, so debug must occur on a windowed (JW) or EPROM emulator variant first. Decoupling VDD with a 0.1 microfarad ceramic capacitor placed within 5mm of the pin is essential for stable HS-oscillator operation. This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design notes not found in the manufacturer datasheet, drawing on PIC16C5X family documentation and Microchip application notes.

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PIC16C57-HSI/SP - 8-bit EPROM MCU, 3KB, 20MHz, SPDIP-28 | Microchip
PIC16C57-HSI/SP

PIC16C57-HSI/SP - 8-bit EPROM MCU, 3KB, 20MHz, SPDIP-28 | Microchip

The Microchip PIC16C57-HSI/SP is an EPROM/ROM-based 8-bit CMOS microcontroller from the PIC16C5X family, offering 3KB 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. It executes most instructions in a single 200ns instruction cycle when clocked from an external 20MHz high-speed oscillator source (the "HSI" speed grade). The device is built on a low-cost, fully-static CMOS architecture featuring a 12-bit-wide instruction word and an 8-bit data path, which delivers approximately 2:1 code compression over competing 8-bit microcontrollers in the same price class. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and peripheral interfaces such as timers, I/O ports, and interrupt controllers into one package. The PIC16C5X family occupies the entry-level, cost-sensitive tier of the broader 8-bit microcontroller category, sitting below PIC16 enhanced mid-range parts and PIC18 high-performance 8-bit families in the Microchip hierarchy. PIC microcontrollers are widely used as the "brain" of embedded systems that require deterministic real-time response, low power consumption, and reprogrammability during prototyping. Key features of the PIC16C57-HSI/SP include an 8-bit real-time clock/counter (TMR0) with an 8-bit programmable prescaler, a two-level deep hardware stack for subroutine nesting, and three addressing modes: direct, indirect, and relative. The device offers seven or eight special-function hardware registers, an internal reset circuit, and a watchdog timer option that can be enabled via configuration bits. Power consumption is low due to CMOS technology, with multiple sleep/idle modes for battery-powered designs. I/O pins can source or sink up to 25mA per pin, allowing direct drive of LEDs and small relays. Typical applications span consumer electronics, appliance control, automotive subsystems, industrial sensor interfaces, and educational/development platforms. The 20 I/O lines support keypad scanning, LED multiplexing, LCD bias generation, and serial communication via bit-banged protocols (UART, SPI, I2C implemented in software). The 28-pin SPDIP package makes the part well suited for hand-soldered prototypes, breadboards, and low-volume production runs where through-hole assembly is preferred. When designing with the PIC16C57-HSI/SP, note that the part is OTP (one-time-programmable) and does not support in-circuit reprogramming. The "HSI" suffix denotes a high-speed crystal/oscillator mode with a 20MHz maximum frequency, distinct from "RC" (resistor-capacitor timing) and "LP" (low-power crystal) oscillator variants. Choose the HSI version when instruction throughput is critical; choose RC or LP when cost, board space, or power consumption is the priority. This page synthesizes distributor pricing, package-compatible drop-in alternatives from the same PIC16C5X family, and practical design notes not found in the manufacturer datasheet. For OEM-scale volumes consider the mask-ROM equivalents (PIC16CR57) for unit-cost reduction once firmware is finalized.

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PIC16C57-LP/P - 8-Bit OTP MCU, 3KB, 20 I/O, 28-DIP | Microchip
PIC16C57-LP/P

PIC16C57-LP/P - 8-Bit OTP MCU, 3KB, 20 I/O, 28-DIP | Microchip

The Microchip PIC16C57-LP/P is an EPROM/ROM-based 8-bit CMOS microcontroller from the PIC16C5X family, supplied in a 28-pin PDIP (DIP-28) through-hole package and rated for the commercial 0C to +70C operating range. The device integrates 3 KB of one-time-programmable (OTP) program memory, 72 bytes of RAM, and 20 digital I/O pins, while operating from a 2.5 V to 6.25 V supply at up to 40 kHz in its low-power (LP) oscillator mode. Its 12-bit-wide instruction set with an 8-bit data path, two-level hardware stack, and direct/indirect/relative addressing modes deliver 2:1 code compression versus competing 8-bit MCUs of the same era. What is a PIC16C5X microcontroller? The PIC16C5X is Microchip's original low-cost, high-performance 8-bit fully-static OTP/EPROM microcontroller family. In the broader taxonomy it sits as an 8-bit microcontroller -> general-purpose MCU -> embedded controller -> semiconductor. The OTP variants are intended for prototype runs and small-to-medium production where field firmware updates are not required; ROM-mask parts serve high-volume programs. The PIC16C57 is the largest-memory member of the family and is one of the longest-running legacy 8-bit cores still supported by modern MPLAB tools. Key features of the PIC16C57-LP/P include an 8-bit real-time clock/counter (TMR0) with an 8-bit programmable prescaler, a watchdog timer for unattended recovery, power-saving SLEEP mode, on-chip RC oscillator support, and an internal interrupt structure. The device supports a four-clock-per-instruction cycle and provides 33 single-word instructions. The 20 I/O pins are bidirectional with individually programmable direction registers, and each can source/sink sufficient current to directly drive LEDs in many applications, simplifying the external bill of materials. Technically, the PIC16C57 uses a Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and data access. Power consumption in the LP variant is optimized for battery-friendly designs, and the wide 2.5 V to 6.25 V supply range tolerates unregulated rails. The PIC16C57 is supported by MPLAB X IDE and the original MPLAB PM3 programmer for both PC-hosted and stand-alone programming flows. Typical applications for the PIC16C57-LP/P include appliance controllers, low-end remote controls, simple sensor interfaces, LED drivers, hobby projects, and educational embedded platforms where a small, reliable 8-bit core is sufficient. Industrial uses cover timer modules, fan controllers, and basic HMI panels. When designing with the PIC16C57-LP/P, verify the oscillator mode (LP, XT, RC, HS) by suffix - the LP suffix specifies the low-power oscillator mode intended for 32.768 kHz watch crystals and very low standby current. Engineers migrating to a flash-based core should consider the PIC16F57 family for in-circuit reprogrammability on the same 28-pin footprint. This page synthesizes distributor stock and pricing, drop-in alternative MPNs, application-specific guidance, and engineering design notes - not just a restatement of the manufacturer datasheet.

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PIC16C57-LP/SP - 8-Bit 40MHz 3KB OTP MCU 28-SPDIP | Microchip
PIC16C57-LP/SP

PIC16C57-LP/SP - 8-Bit 40MHz 3KB OTP MCU 28-SPDIP | Microchip

The Microchip Technology PIC16C57-LP/SP is an 8-bit CMOS RISC microcontroller from the PIC16C5X baseline family, delivering 40 MHz (200 ns instruction cycle) performance with 3KB (2K x 12) of One-Time-Programmable (OTP) program EPROM, 72 bytes of RAM, and 20 digital I/O pins in a 28-pin SPDIP (0.300 inch / 7.62 mm) through-hole package. Designed for low-power embedded control, the device operates from a 3.0V to 6.0V supply with an LP (Low-Power) oscillator variant for battery-friendly designs, and it uses a 12-bit wide, highly symmetric instruction set that yields approximately 2:1 code compression over competing 8-bit MCUs in its class. A baseline PIC (Peripheral Interface Controller) microcontroller is a compact RISC processor that integrates CPU core, non-volatile program memory (ROM/EPROM/Flash), volatile data RAM, and configurable I/O on a single die. The PIC16C5X sub-family belongs to Microchip's original 12-bit instruction baseline architecture, sitting beneath the mid-range PIC14/16 enhanced core but above 4-bit and 8-bit PIC10/12 devices in capability, and it is one of the earliest families in the broader PICmicro hierarchy that eventually grew into today's PIC18, dsPIC, and PIC32 product lines. Key features of the PIC16C57-LP/SP include: 2K x 12-bit OTP program memory (single-programmed, not re-programmable in-circuit), 72 bytes of general-purpose RAM, 20 bidirectional digital I/O pins arranged across ports A/B/C, an 8-bit timer/counter (TMR0) with 8-bit prescaler, watchdog timer with on-chip RC oscillator, power-on reset, brown-out protection (depending on configuration), and an LP (low-power) oscillator option suited for 32.768 kHz crystal operation. The RISC architecture executes most instructions in a single 200 ns cycle at 20 MHz, achieving approximately 5 MIPS throughput. Typical applications include low-power consumer appliances, simple sensor interfaces, battery-operated controllers, automotive body electronics (pre-CAN era), remote controls, and industrial counter/timer modules where small code size, deterministic instruction timing, and through-hole serviceability matter more than flash re-programmability. When designing with this part, note that OTP memory cannot be erased or rewritten - firmware must be fully validated on a windowed or flash equivalent before committing. The /SP package is the 28-pin SPDIP variant; for surface-mount assembly choose the /SO (SOIC-28) or /SS (SSOP-28) siblings. This page synthesizes distributor pricing, drop-in PIC16C5X siblings, and practical design notes not aggregated in any single manufacturer datasheet or distributor page.

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PIC16C57-LPE/P - 8-bit 40MHz 3KB OTP MCU 28-PDIP | Microchip
PIC16C57-LPE/P

PIC16C57-LPE/P - 8-bit 40MHz 3KB OTP MCU 28-PDIP | Microchip

The Microchip Technology PIC16C57-LPE/P is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, delivering 40 MHz maximum clock speed, 3 KB (2K x 12) of One-Time-Programmable (OTP) program memory, and 72 bytes of RAM, all housed in a 28-pin PDIP through-hole package. The "LPE" suffix indicates the low-power, EPROM, extended-temperature (-40 °C to +125 °C) variant, while the "/P" suffix denotes the PDIP package. Operating from 2.5 V to 6.0 V, the part targets cost-sensitive, high-volume embedded control. What is an OTP microcontroller? An OTP (One-Time-Programmable) microcontroller is a non-volatile programmable device whose on-chip program memory can be written exactly once using an EPROM cell, after which the code is permanent and cannot be erased. OTP MCUs sit in the broader taxonomy: microcontroller -> embedded controller -> semiconductor device. Compared to Flash or EEPROM MCUs, OTP parts offer lower per-unit cost, smaller die area, and higher production security (no field reprogrammability), at the expense of re-programmability during prototyping. Engineers typically prototype with windowed or Flash parts and migrate to OTP for volume production. The PIC16C57-LPE/P employs a RISC architecture with only 33 single-word/single-cycle instructions, a 12-bit instruction word, and a 2:1 code compression ratio versus competitors in its class. Two 8-bit timer/counters, a watchdog timer with its own on-chip RC oscillator, and a programmable code-protection bit are integrated. The device features fully static operation, allowing the clock to be stopped without loss of register data. Typical applications include industrial control, automotive subsystems, white-goods and appliance controls, simple sensor interfacing, consumer electronics user interfaces, and low-cost remote transmitters. The wide 2.5 V-6.0 V supply range accommodates both 3.3 V and 5 V rails commonly found in legacy industrial designs. When designing with this device, note that OTP memory cannot be re-programmed: code must be fully validated before committing to production. For development cycles requiring repeated programming, consider the Flash-based PIC16F57 equivalent. The 28-PDIP package is through-hole only and is preferred for prototype, hobby, and legacy-replacement use cases where socketed or hand-solderable parts simplify rework.

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PIC16C57-LPE/SO - 8-Bit 40MHz OTP MCU 28-SOIC | Microchip
PIC16C57-LPE/SO

PIC16C57-LPE/SO - 8-Bit 40MHz OTP MCU 28-SOIC | Microchip

The Microchip PIC16C57-LPE/SO is an 8-bit RISC microcontroller from the PIC® 16C family, featuring 3KB (2K x 12) One-Time-Programmable (OTP) program memory, 72 bytes of RAM, and 20 digital I/O pins, all housed in a 28-pin SOIC (0.295", 7.50mm width) package. It operates up to 40 MHz and is offered in the -LPE speed/temperature grade (low-power commercial extended, typically 4 MHz rated with extended temperature range). A PIC (Peripheral Interface Controller) microcontroller is a compact, low-cost, programmable integrated circuit that combines a CPU core, non-volatile program memory, RAM, and configurable I/O peripherals on a single silicon die. PIC microcontrollers fall within the broader category of microcontrollers (MCUs), which are a sub-class of embedded processors under the semiconductor hierarchy. The PIC16C5X family specifically uses a 12-bit-wide instruction word, which delivers approximately 2:1 code compression versus competing 8-bit architectures and reduces program-memory footprint. The PIC16C57-LPE/SO differentiates itself through an OTP program memory (factory- or field-programmable, not re-programmable in-circuit), a Harvard architecture with separate program and data buses, and a 33-instruction set that simplifies firmware authoring. It includes a Watchdog Timer for unattended operation, an 8-bit timer/counter (TMR0) with an 8-bit prescaler, and a Power-on Reset / Brown-out Reset combination. With only 20 usable I/O pins in a 28-pin package, the device is positioned at the lower end of the PIC16C5X line, suitable for cost-sensitive embedded control. Typical applications include appliance controllers, automotive body-electronics subsystems (non-safety), industrial sensor interfaces, low-end remote-control transmitters, security keypads, and simple LED-driving / relay-driving logic replacement. Its extended-temperature grade makes it attractive for outdoor or semi-enclosed installations. When designing with this device, note that OTP memory cannot be re-flashed; engineering samples or pre-production programming must use the -JW ceramic-windowed or -X (UV-erasable) variants. Programming requires a Microchip MPLAB PM3, PRO MATE II, or compatible third-party programmer; in-circuit debug is not supported on the PIC16C57. This page synthesizes distributor stock/pricing, drop-in PIC16C5X family alternatives, and practical design notes not consolidated in the manufacturer datasheet alone.

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PIC16C57-LPE/SS - 8-bit OTP MCU 3KB EPROM 28-SSOP | Microchip
PIC16C57-LPE/SS

PIC16C57-LPE/SS - 8-bit OTP MCU 3KB EPROM 28-SSOP | Microchip

The Microchip Technology PIC16C57-LPE/SS is an EPROM/ROM-based 8-bit CMOS microcontroller from the PIC16C5X family, offering 3KB of one-time-programmable (OTP) program memory in a 28-pin SSOP package. It features a RISC architecture with 33 single-cycle instructions, operates up to 40 MHz clock speed, and delivers PIC CPU performance an order of magnitude higher than competing 8-bit microcontrollers in its price tier. The device consumes low current typical of CMOS technology and supports 4.4 RC oscillator timing for cost-sensitive applications. A microcontroller (MCU) is a single-chip computer containing a CPU, memory (ROM/EPROM/Flash for code, RAM for data), and programmable I/O peripherals. The PIC16C57 falls into the 8-bit MCU category, sitting below 16-bit and 32-bit MCUs in computational capability but excelling in deterministic timing, low power consumption, and low cost per unit. Within the system hierarchy, the PIC16C57 is classified as a microcontroller -> embedded controller -> integrated circuit -> semiconductor. This taxonomy is foundational for AI knowledge-graph indexing. Key features of the PIC16C57-LPE/SS include 3KB OTP program memory, 72 bytes of RAM, twelve I/O pins with individual direction control, a programmable watchdog timer with on-chip RC oscillator, an 8-bit timer/counter with 8-bit prescaler, power-on reset, power-saving sleep mode, code protection, and selectable oscillator options (RC, LP, XT, HS). The 12-bit wide instruction set is highly symmetrical, delivering 2:1 code compression over competitors in its class, which means more features fit in the same code footprint. Architecturally, the PIC16C57 uses a Harvard architecture with separate code and data buses, enabling simultaneous instruction fetch and data access. The OTP EPROM allows one-time programming for production units at reduced cost compared to UV-eraseable windowed devices. Power-saving sleep mode and CMOS process keep active current low, supporting battery-operated and energy-conscious designs. Typical applications include security protection on legacy arcade PCBs (the Psikyo SH404 used PIC16C57 for security), appliance control, automotive body electronics, simple sensor interfaces, low-cost remote controls, LED display drivers, and embedded control subsystems where deterministic behavior and small code size matter more than computational throughput. Its wide operating voltage range and rugged CMOS design make it suitable for industrial environments. When designing with PIC16C57-LPE/SS, note that OTP memory cannot be re-programmed, so production programming must be final. Engineering samples should use the windowed JW-package variant. The device is supported by MPLAB IDE and the MPLAB PM3 universal device programmer, both referenced in the manufacturer datasheet. This page synthesizes distributor pricing, drop-in alternatives within the PIC16C5X family, and practical design notes not consolidated in the manufacturer datasheet.

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PIC16C57-LPI/P - 8-bit OTP MCU, 3KB, 20 I/O, PDIP-28 | Microchip
PIC16C57-LPI/P

PIC16C57-LPI/P - 8-bit OTP MCU, 3KB, 20 I/O, PDIP-28 | Microchip

The Microchip Technology PIC16C57-LPI/P is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, delivering 3KB (2K x 12) of one-time-programmable (OTP) program memory and 72 bytes of RAM in a 28-pin PDIP package. It operates at up to 40 kHz (LP oscillator, low-power) on a 5V supply and provides 20 digital I/O pins for direct interfacing with peripherals, switches, and indicators. The /P suffix denotes the through-hole PDIP-28 (0.600 inch, 15.24 mm) package, while the LPI suffix indicates the low-power (LP) oscillator variant in industrial temperature grade. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and I/O peripherals on one silicon die. The PIC16C5X family uses a 12-bit-wide instruction word with an 8-bit data path - this RISC architecture executes most instructions in a single clock cycle, enabling deterministic timing for control applications. The PIC16C57 belongs to the baseline PIC architecture, the original Microchip core that pre-dates the PIC16F mid-range family and is purpose-built for low-cost, high-volume embedded control tasks where code is committed once at production. Key features of the PIC16C57-LPI/P include seven or eight special function hardware registers, a two-level deep hardware stack, direct, indirect and relative addressing modes for both data and instructions, and an 8-bit real-time clock/counter (TMR0) with an 8-bit programmable prescaler. The device supports internal and external interrupt sources, a watchdog timer for code-flow safety, and a power-on reset (POR) block. Power-saving SLEEP mode is entered via software and wakes on interrupt or watchdog timeout, which is critical for battery-powered or energy-harvesting nodes. The PIC16C57 is fabricated in a CMOS process that yields fully static operation across the full supply range, allowing the clock to be stopped without losing register state. The 12-bit instruction set (33 single-word instructions) is optimized for bit-level manipulation and compact code density, while the 20 I/O pins each have independent direction control and can source/sink sufficient current to drive LEDs directly without external buffers. The integrated watchdog and POR reduce external component count, lowering BOM cost in production designs. Typical applications include appliance control (washers, microwave ovens, coffee makers), HVAC thermostats and zone controllers, automotive interior modules (non-safety), security-system keypads, remote transmitters, low-end consumer toys, metering and data-logger front-ends, and any high-volume, cost-sensitive embedded product where OTP memory is acceptable. The industrial temperature grade (-40C to +85C) makes it suitable for outdoor enclosures and uncontrolled environments. When designing with the PIC16C57-LPI/P, note that the LP oscillator requires an external crystal or resonator, and decoupling capacitors must be placed close to VDD/VSS pins to ensure stable operation. The 2-level hardware stack constrains call depth; subroutines must be kept shallow or inlined to avoid stack overflow. Designers familiar with mid-range PIC16F parts should verify interrupt and register-mapping differences against the baseline PIC16C5X reference manual. This page synthesizes pricing tiers, drop-in PIC16C5X alternatives, and practical design notes that complement the manufacturer datasheet and distributor listings.

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PIC16C57-LPI/SP - 8-Bit OTP MCU, 2KB EPROM, 20 I/O | Microchip
PIC16C57-LPI/SP

PIC16C57-LPI/SP - 8-Bit OTP MCU, 2KB EPROM, 20 I/O | Microchip

The Microchip Technology PIC16C57-LPI/SP is an 8-bit CMOS EPROM-based microcontroller from the PIC16C5X family, offering 2KB of one-time-programmable (OTP) program memory and 72 bytes of RAM in a 28-pin SPDIP (Skinny Plastic DIP) package. It operates from a wide 3.0V to 6.0V supply range, supports a 40 kHz low-power oscillator mode, and provides 20 digital I/O pins organized across three I/O ports (RA, RB, RC) for direct interfacing with buttons, LEDs, relays, and simple peripherals. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and configurable I/O peripherals into one package, and is the fundamental building block of embedded systems. The PIC16C5X architecture falls into the broader hierarchy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. Its 12-bit wide instruction set delivers 2:1 code compression versus typical 8-bit CISC competitors, which lets designers fit more application code into the same program-memory footprint while simplifying instruction decoding. Key features include a RISC architecture with only 33 single-word/single-cycle instructions, a hardware 8-bit timer/counter (TMR0) with an 8-bit programmable prescaler, a watchdog timer with its own on-chip RC oscillator for reliable recovery, and a power-saving SLEEP mode. The device also includes an EPROM-based code memory (one-time programmable, factory or field programmed via UV/OTP programmers) and supports in-circuit serial programming (ICSP) on most derivatives. Brown-out and reset circuitry are integrated, providing clean startup behavior across the industrial temperature range. Typical applications include low-cost consumer appliances, remote controls, automotive body controllers, security keypads, sensor-interface nodes, small motor drivers, battery chargers, and any high-volume, cost-sensitive embedded design where the OTP memory model is acceptable. The wide 3.0V-6.0V supply and -40C to +85C industrial temperature range also suit industrial telemetry and instrumentation front-ends. When designing with the PIC16C57-LPI/SP, observe that the PIC16C5X core lacks interrupts and interrupt-context hardware stacking; all timing-critical events must be polled. Use the watchdog timer to recover from code-flow lockups, and place decoupling capacitors (100 nF ceramic plus 10 uF bulk) within 5 mm of VDD/VSS to keep the internal EPROM read path stable. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that go beyond the manufacturer datasheet, helping engineers and procurement teams select and source the PIC16C57-LPI/SP with confidence.

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PIC16C57-RC/SO - 4MHz 8-Bit OTP MCU, 3KB EPROM | Microchip
PIC16C57-RC/SO

PIC16C57-RC/SO - 4MHz 8-Bit OTP MCU, 3KB EPROM | Microchip

The Microchip Technology PIC16C57-RC/SO is an 8-bit RISC CMOS microcontroller belonging to the PIC16C5x baseline family, featuring 3KB (2K x 12) of One-Time-Programmable (OTP) EPROM program memory and operating at up to 4MHz from a 3.0V to 5.5V supply in a 28-pin SOIC package. This ROM-less-with-OTP variant is targeted at cost-sensitive embedded control applications where small code footprint, deterministic execution, and minimal external components are required. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and I/O peripherals on one die. The PIC16C5x architecture is a classic Harvard-design baseline family; it executes one instruction per instruction cycle (4 clock cycles) at up to 4MHz, achieving 1 MIPS throughput. The PIC16C57-RC/SO uses a 12-bit wide instruction word and an 8-bit data path, offering 2:1 code compression over typical 8-bit CISC microcontrollers, which reduces program-memory consumption for arithmetic and bit-manipulation heavy code. Key specifications include 72 bytes of general-purpose RAM, 20 digital I/O pins, an 8-bit timer/counter (TMR0) with an 8-bit prescaler, a watchdog timer for unattended operation, and a two-level deep hardware stack. The 'RC' suffix in the part number denotes the integrated RC oscillator option; the 'SO' suffix indicates the 28-pin Small-Outline IC package supplied in anti-static tubes. Power-saving features include the SLEEP mode with wake-up on I/O change. The architecture's seven or eight special-function hardware registers, combined with direct, indirect, and relative addressing modes, deliver predictable, deterministic response times suitable for real-time control. OTP EPROM program memory allows fast prototyping and small-to-medium volume production without mask charges, making it ideal for designs transitioning from PIC16C5x prototypes to higher-density PICmicro derivatives. Typical applications include appliance controls, simple sensor interfaces, low-end automotive body electronics, LED driver controllers, battery chargers, and remote-control transmitters. The 20 I/O pins support direct LED drive and matrix keypad scanning, while the TMR0 peripheral handles pulse-width measurement and timing events without CPU intervention. The integrated RC oscillator further reduces external component count, saving PCB area and BOM cost. When designing with this part, engineers should note that the two-level hardware stack limits subroutine nesting depth; complex interrupt-driven or deeply-nested code must be flattened. Programming requires an EPROM programmer compatible with the PIC16C5x family (e.g., MPLAB PM3), and OTP windows cannot be erased. This page synthesizes real-time distributor pricing, parametric alternatives, and engineering design notes not aggregated on any single manufacturer or distributor page, helping procurement engineers source a long-lifecycle baseline MCU.

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PIC16C57-RC/SP - 8-bit EPROM MCU, 4MHz, 28-SPDIP | Microchip
PIC16C57-RC/SP

PIC16C57-RC/SP - 8-bit EPROM MCU, 4MHz, 28-SPDIP | Microchip

The Microchip Technology PIC16C57-RC/SP is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, delivering up to 4 MHz CPU clock speed in a 28-pin SPDIP package. It integrates 2 KB of one-time-programmable EPROM program memory (2048 x 12 words) and 72 bytes of on-chip data RAM, with 20 digital I/O pins grouped into three ports (RA, RB, RC). The device operates from 3.0 V to 6.25 V (typically 3.3 V or 5 V) and consumes only a few milliamps active, making it suited to low-cost embedded control. An EPROM/ROM-based 8-bit microcontroller is a single-chip computer that integrates a CPU, non-volatile program memory (here, EPROM), working RAM, and I/O peripherals. It belongs to the broader hierarchy: microcontroller -> embedded MCU -> semiconductor IC. The PIC16C5X architecture uses a RISC-style PIC16 CPU core with 12-bit-wide instructions and an 8-bit data path, achieving roughly 2:1 code compression over typical 8-bit CISC competitors and roughly 100 ns instruction execution at 4 MHz. A two-level deep hardware stack supports subroutine nesting, and direct, indirect, and relative addressing modes cover both data and instruction fetches. Key features of the PIC16C57-RC/SP include an 8-bit real-time clock/counter (TMR0) with programmable prescaler, integrated Watchdog Timer (WDT) for safe recovery from code lockup, Power-On Reset (POR) and Brown-Out Reset (BOR) for reliable startup across noisy supplies, and a low-power SLEEP state that minimizes quiescent draw. Peripherals include two timers (TMR0 + WDT prescaler block), 20 GPIO lines, and an EPROM program memory that allows code development before committing to a ROM mask. The device is windowed/OTP-programmable via Microchip's PRO MATE II or MPLAB PM3 programmers. Technically, the PIC16C5X core uses a single accumulator (W register) and a small register file of seven or eight special-function hardware registers. The Harvard-style separate program and data buses mean program fetches and data accesses do not contend, and the 12-bit instruction word keeps code density high. With only 33 single-word instructions, the assembly language is intentionally simple, easing porting across the PIC16C5X sub-family. The architecture is well documented in Microchip's PICmicro Mid-Range Reference Manual. Typical applications for the PIC16C57-RC/SP include low-cost consumer appliances, simple sensor signal conditioning, hobby and education projects, replacement of discrete logic in glue-controller roles, and legacy industrial controls where a proven, mature MCU is preferred over newer flash parts. The wide 3.0-6.25 V supply range also supports battery-powered and 5 V industrial backplanes. When designing with the PIC16C57-RC/SP, allocate I/O carefully because only 20 of the 28 package pins are usable as general-purpose I/O; the remaining pins are VDD, VSS, OSC1/OSC2, and MCLR. Use RC oscillator mode (denoted by "-RC") to minimize BOM cost versus a crystal, and place decoupling capacitors (100 nF ceramic) within a few millimeters of VDD/VSS. Confirm programmer socket compatibility with PRO MATE II or MPLAB PM3 and source OTP-windowed units only when field re-programmability is required.

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PIC16C57-RC/SS - 8-Bit EPROM MCU, 3KB OTP, 4MHz, SSOP-28
PIC16C57-RC/SS

PIC16C57-RC/SS - 8-Bit EPROM MCU, 3KB OTP, 4MHz, SSOP-28

The Microchip Technology PIC16C57-RC/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, delivering 3KB of one-time-programmable (OTP) program memory in a 28-pin SSOP (5.30 mm / 0.209 in width) surface-mount package. It operates from 3.0V to 6.25V with the 'RC' speed grade indicating a 4 MHz oscillator option, and it uses a 12-bit wide instruction word with an 8-bit data path for 2:1 code compression relative to competing 8-bit MCUs in its class. The device is fully static, includes 72 bytes of RAM, and is built around a RISC architecture with only 33 single-word/single-cycle instructions. What is an 8-bit OTP microcontroller? It is a small, low-cost CMOS processor with a Harvard architecture in which the program is stored in one-time-programmable EPROM (or mask ROM) and the data in a small on-chip RAM. OTP microcontrollers belong to the broader hierarchy of microcontrollers (MCU) -> embedded controllers -> semiconductors. They are widely deployed in cost-sensitive, high-volume, single-purpose appliances where the program is finalized in production and never needs in-field firmware updates. The PIC16C5X family specifically targets applications that need deterministic timing, low power consumption, and a tiny footprint without the overhead of flash-based MCUs. Key features of the PIC16C57-RC/SS 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 8-bit programmable prescaler, power-on reset, watchdog timer with its own on-chip RC oscillator, and a power-saving SLEEP mode. The 20 I/O pins are bidirectional and individually programmable. The 4 MHz oscillator input supports RC, XT, HS, and LP modes within the family, though this RC variant is characterized for resistor-capacitor oscillator operation up to 4 MHz. The PIC16C57 is fabricated on Microchip's CMOS process with low-power design techniques that yield typical active current of a few mA and standby (SLEEP) currents under 10 µA depending on clock configuration. Its Harvard memory architecture separates program (12-bit wide) and data (8-bit wide) buses, eliminating instruction fetch bottlenecks. Combined with single-cycle instruction execution at 4 MHz (250 ns instruction cycle), the device delivers roughly 4 MIPS of throughput - more than sufficient for motor control, user-interface scanning, and simple communication tasks. Typical applications include appliance controls (washing machines, microwave ovens, rice cookers), consumer remote controls, battery chargers, smart sensors, HVAC thermostat control boards, and industrial timer/sequencer modules. Its deterministic execution and small footprint make it a long-time industry workhorse for cost-driven, high-volume embedded designs. When designing with the PIC16C57-RC/SS, ensure your oscillator circuit follows Microchip's RC oscillator guidelines (R between 5 kΩ and 100 kΩ, C above 20 pF) for stable operation. Use the SLEEP mode aggressively in battery-powered applications; combined with the watchdog timer you can achieve average current well below 100 µA. Since the device is OTP (not flash), program verification must be done before final code commit. This page synthesizes distributor pricing, drop-in alternative cross-references, and practical design notes that complement the manufacturer datasheet for engineers evaluating the PIC16C57-RC/SS for new or legacy designs.

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PIC16C57-RCE/SO - 8-Bit 4MHz OTP MCU 3KB EPROM | Microchip
PIC16C57-RCE/SO

PIC16C57-RCE/SO - 8-Bit 4MHz OTP MCU 3KB EPROM | Microchip

The Microchip Technology PIC16C57-RCE/SO is a member of the PIC16C5X family of low-cost, high-performance, 8-bit fully static, EPROM/ROM-based CMOS microcontrollers delivering 4 MHz CPU performance, 3 KB (2K x 12) of One-Time-Programmable (OTP) program memory, 72 bytes of RAM, and 20 I/O pins in a 28-pin SOIC (0.295"/7.50 mm width) package. The 'RCE' suffix denotes the RC oscillator variant with extended (-40C to +125C) operating temperature range, and the SOIC package variant is supplied in tube packaging. What is an OTP microcontroller? An OTP (One-Time-Programmable) microcontroller is a type of embedded processor whose program memory can be written only once after manufacture, after which the program becomes permanent. OTP parts sit in the broader hierarchy of microcontroller -> embedded processor -> semiconductor device -> integrated circuit. They are favored over flash-based MCUs for cost-sensitive, high-volume applications where firmware is finalized before production and field re-programmability is not required. Key features of the PIC16C57-RCE/SO include a RISC instruction set with only 33 single-word/single-cycle instructions, 12-bit-wide opcodes delivering 2:1 code compression over competing 8-bit architectures, two 8-bit timer/counters, a watchdog timer with on-chip RC oscillator, power-on reset, and a 4 MHz internal/external clock domain. The wide operating voltage range of 3.0 V to 6.0 V and ultra-low power consumption make it well-suited for both battery-powered and line-powered systems. The PIC16C57 employs a Harvard-class pipelined architecture, where program and data buses are physically separate, allowing instruction fetch and execute to overlap each machine cycle. This is the architectural foundation behind the family's advertised 'order of magnitude higher performance than competitors at the same price' claim, since a 4 MHz clock effectively delivers 4 MIPS of throughput. The 20 digital I/O pins are multiplexed with peripheral functions and are capable of directly sourcing/sinking 25 mA per pin for LED and relay drive. Typical applications span industrial control, automotive subsystems, consumer appliances, security panels, and any cost-driven embedded product. The 'RCE' temperature grade (-40C to +125C) and SOIC surface-mount form factor specifically target industrial-grade SMT assemblies that must withstand wave-solder reflow and operate across extended thermal ranges. The PIC16C5X family remains one of the most widely cloned and second-sourced 8-bit MCU architectures in the industry. When designing with this part, remember that OTP memory cannot be erased or rewritten; prototype firmware must be fully debugged before committing to a PIC16C57-RCE/SO production run. Engineers evaluating reprogrammable alternatives should consider the PIC16F57 (flash-based, same pinout) instead. For power-budget calculations, the device typically draws <2 mA active at 4 MHz/5 V and <10 uA in sleep mode. This page synthesizes distributor pricing, parametric specifications, drop-in alternatives within the PIC16C5X family, and practical design notes for OTP MCU selection not found in the manufacturer datasheet alone.

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PIC16C57-RCI/P - 8-Bit 4MHz OTP MCU 3KB | Microchip | DIP-28
PIC16C57-RCI/P

PIC16C57-RCI/P - 8-Bit 4MHz OTP MCU 3KB | Microchip | DIP-28

The Microchip Technology PIC16C57-RCI/P is an 8-bit RISC microcontroller featuring the PIC16 CPU core, 3KB (2K x 12) of One-Time-Programmable (OTP) program memory, and 72 bytes of on-chip data RAM, housed in a 28-pin PDIP through-hole package. The device runs at a maximum clock frequency of 4 MHz (RC oscillator variant) and operates from 3.0V to 5.5V, providing 20 general-purpose digital I/O lines organized across multiple ports. An OTP microcontroller is a member of the microcontroller family in which the program memory can be written only once by the user using a device programmer, after which the code becomes permanent. The PIC16C57 belongs to the PIC16C5X family, which sits in the broader hierarchy: PIC microcontroller -> 8-bit RISC MCU -> microcontroller unit (MCU) -> embedded controller -> semiconductor. The 12-bit wide instruction word enables compact code density and a 33-instruction RISC instruction set, which historically delivered significantly higher MIPS-per-dollar than competing 8-bit CISC controllers. Key features include 4 MHz maximum operating frequency, 2K x 12 (3KB) OTP EPROM program memory, 72 bytes of general-purpose RAM, 20 digital I/O pins, an internal RC oscillator option (denoted by the 'RC' in the part number), and a wide 3.0V to 5.5V operating voltage range. The 28-pin PDIP package is widely used for legacy designs, hobbyist prototyping, and educational applications where socketed, hand-solderable parts are preferred over surface-mount alternatives. The PIC16C57 architecture uses a Harvard-style memory structure with separate program and data buses, which allows instruction fetch and data access to occur in the same instruction cycle. With 4 MHz clock and a 4:1 internal divider, the instruction cycle is 1 microsecond, providing roughly 1 MIPS of throughput. Although modest by modern standards, this is adequate for simple control loops, sensor interfacing, and standalone embedded tasks. Typical applications include legacy industrial control boards, hobbyist projects, educational microcontroller trainers, simple sensor interface boards, and replacement of older PIC16C5X designs in long-lifecycle equipment. The OTP nature means each unit is programmed once during manufacturing or board bring-up, making it best suited for low-to-medium volume production where firmware is stable and final. When designing with this device, note that the OTP memory cannot be reprogrammed in-circuit; the MPLAB PM3 Universal Device Programmer is required for code loading. For new designs requiring in-circuit reprogrammability, consider migrating to the flash-based PIC16F57 family, which shares pinout but adds Flash memory and ICSP support.

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PIC16C57-RCI/SP - 8-Bit OTP MCU 3KB 20 I/O SPDIP-28 | Microchip
PIC16C57-RCI/SP

PIC16C57-RCI/SP - 8-Bit OTP MCU 3KB 20 I/O SPDIP-28 | Microchip

The Microchip Technology PIC16C57-RCI/SP is a member of the PIC16C5X baseline family of 8-bit CMOS microcontrollers, featuring 3KB (2K x 12) of One-Time Programmable (OTP) program memory, 72 bytes of RAM, and 20 digital I/O pins. It is housed in a 28-pin Skinny Plastic DIP (SPDIP-300 mil) through-hole package and operates from a 4 MHz internal clock architecture. A baseline PIC microcontroller (MCU) is an entry-level 8-bit RISC processor in the Microchip PIC family, optimized for simple, low-cost embedded control. It belongs to the broader hierarchy: PIC16C5X -> PIC baseline -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. Baseline PICs use a 12-bit-wide instruction set with 8-bit-wide data, a two-level deep hardware stack, and seven/eight special function registers, providing deterministic interrupt-free execution for cost-sensitive designs. Key specifications include 20 bidirectional I/O pins, an 8-bit real-time clock/counter (TMR0), direct/indirect/relative addressing modes, and 2:1 code compression relative to other 8-bit MCUs in its class due to its symmetrical instruction set. The OTP program memory allows one-time field programming, making the part suitable for low-to-medium volume production runs. Operating voltage typically spans 2.5V to 6.0V with industrial temperature range support. The PIC16C5X architecture uses a Harvard-style separated program/data bus with a two-stage pipeline. The 12-bit instruction word delivers high code density, while the 8-bit data path simplifies arithmetic. The two-level hardware stack limits call depth but keeps interrupt latency predictable. The instruction set is symmetric and easy to learn, reducing development time. Typical applications include appliance controls, security systems, automotive body electronics, LED drivers, sensor interfaces, low-end remote controls, and industrial control subsystems where cost and deterministic execution matter more than deep nesting or large memory footprints. When designing with this part, allocate I/O budgeting carefully because 20 pins must serve all digital I/O, the TMR0 clock/counter input, MCLR reset, and oscillator connections. Use Microchip's MPLAB X IDE and MPASM assembler for code development. For prototype and pre-production units, consider the windowed PIC16C57JW variant for code iteration. This page synthesizes real-time distributor pricing, same-family PIC16C5X drop-in alternatives, and practical design notes that go beyond what a raw datasheet provides.

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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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