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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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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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