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PIC12C509A-04I/SM - 8-bit 4MHz OTP MCU 1.5KB | Microchip
PIC12C509A-04I/SM

PIC12C509A-04I/SM - 8-bit 4MHz OTP MCU 1.5KB | Microchip

The Microchip PIC12C509A-04I/SM is a baseline 8-bit CMOS OTP (One-Time Programmable) microcontroller in the PIC12 family, offering 1.5 KB of program memory (1K x 12 words), 41 bytes of RAM, and 4 MHz maximum operating frequency in an 8-pin SOIJ (SM) package. It executes instructions in 1 microsecond per instruction cycle (200 ns at 4 MHz input) and supports 33 single-word instructions from the PIC16C5X-enhanced RISC architecture. What is an 8-bit OTP microcontroller? An 8-bit OTP microcontroller is a small, low-pin-count programmable logic controller that stores its program code in one-time-programmable EPROM rather than Flash or EEPROM. OTP parts occupy the lowest-cost tier of the microcontroller market and are widely used in cost-sensitive, high-volume products where firmware will not change after programming. They sit within the broader category hierarchy: microcontroller (MCU) -> 8-bit MCU -> baseline PIC12 family -> PIC12C5xx series -> PIC12C509A sub-family. Key features of the PIC12C509A-04I/SM include a wide operating voltage range from 2.5 V to 5.5 V (industrial, -40C to +85C), an integrated 4 MHz internal RC oscillator option plus external oscillator support, Power-On Reset (POR), Watchdog Timer (WDT) with on-chip RC oscillator, 5 GPIO pins (6 I/O on some variants), and code protection via EPROM bit. The device draws very low operating current and supports sleep mode for battery-powered designs. Architecturally, the PIC12C509A uses a 12-bit program word width and Harvard-style separate program/data buses, enabling single-cycle instruction fetch with deterministic 1 us execution at 4 MHz. The device includes a hardware ALU, 8-level deep stack, and self-programming capability. Compared to the PIC12C508A (which has 0.75 KB / 512 x 12 program memory), the PIC12C509A doubles the program memory and is otherwise pin-compatible. Typical applications include consumer appliance controllers, sensor signal conditioning, LED driving logic, automotive body electronics sub-modules, simple remote-control encoders, battery chargers, and industrial timer/counter modules. The 8-pin SOIJ package supports compact surface-mount assembly in space-constrained PCB layouts. Design considerations include the OTP nature - code must be perfect before programming as it cannot be erased or rewritten. Engineers should prototype with the PIC12F509 (Flash equivalent) before committing to OTP for production. The /SM suffix denotes the SOIJ package with industrial (-40C to +85C) temperature grade. This page synthesizes XAIPART distributor pricing, drop-in same-brand and cross-brand alternatives, application reference designs, and practical engineering notes beyond the manufacturer datasheet summary.

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PIC12C509A-04I/SN - 8-bit OTP MCU, 1.5KB, 4MHz, SOIC-8 | Microchip
PIC12C509A-04I/SN

PIC12C509A-04I/SN - 8-bit OTP MCU, 1.5KB, 4MHz, SOIC-8 | Microchip

The Microchip Technology PIC12C509A-04I/SN is an 8-bit CMOS one-time programmable (OTP) microcontroller in the PIC12 family, packaged in an 8-pin SOIC (SN) with industrial-grade -40C to +85C temperature rating, 4 MHz maximum operating frequency, 1.5 KB (1K x 12) of OTP program memory, and 41 bytes of RAM. An OTP microcontroller is a class of embedded processor whose program memory can be written exactly once by the user (or the foundry) and thereafter behaves as read-only ROM. Microcontrollers sit at the heart of embedded systems as programmable compute engines that read sensors, drive actuators, and run deterministic control loops. The PIC12 family in particular belongs to Microchip's baseline 8-bit RISC architecture, sitting below PIC16/18 mid-range parts but above 6-pin PIC10 devices in the portfolio hierarchy. Key features of the PIC12C509A-04I/SN include six general-purpose I/O pins, an 8-bit real-time clock/counter (TMR0) with an 8-bit programmable prescaler, a Power-On Reset (POR), a Device Reset Timer (DRT), a Watchdog Timer (WDT) with its own on-chip RC oscillator, and code-protection bit support. The Harvard RISC core executes instructions in a single cycle (1 microsecond at 4 MHz), and the part supports 33 single-word instructions for compact coding. Typical applications include automotive body electronics, industrial appliance control, consumer products, and any low-pin-count embedded design where deterministic behavior, low power, and a small PCB footprint matter more than program-memory rewritability. The SOIC-8 footprint allows hand-soldering and reflow on standard 150-mil-pitch land patterns. When designing with this part, verify that OTP write timing falls within the programmer specification, since OTP parts cannot be erased. For development, use the PIC12F509 (Flash-based, pin-compatible 8-pin drop-in) or the PIC12C509A-04/SN (commercial 0C to +70C grade) as engineering substitutes before committing to the -40C to +85C industrial "I" variant.

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PIC12C509A/JW - 8-Bit CMOS MCU, 1.5KB EPROM, 4MHz | Microchip
PIC12C509A/JW

PIC12C509A/JW - 8-Bit CMOS MCU, 1.5KB EPROM, 4MHz | Microchip

The Microchip Technology PIC12C509A/JW is an 8-bit CMOS microcontroller based on the Enhanced PIC16C5X architecture, packaged in an 8-lead CDIP windowed package with 1.5KB (1K x 12) of UV-erasable EPROM program memory, 41 bytes of RAM, and a 4MHz internal instruction execution rate. The /JW suffix indicates a windowed ceramic DIP package allowing UV erasure for prototyping and development, while the base PIC12C509A silicon supports 33 single-word instructions with 1 microsecond instruction execution. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (ROM/RAM), and peripherals into one package. The PIC12C509A belongs to Microchip's PIC® 12C family of 8-bit microcontrollers, which sit within the broader 8-bit MCU -> microcontroller -> embedded processor -> semiconductor taxonomy. The 12C series targets cost-sensitive, space-constrained applications where minimal pin count and ultra-low power consumption outweigh computational throughput. Key features include 5 GPIO-capable pins (GP0-GP5 with GP3 shared with MCLR/VPP), a wide operating voltage range of 2.5V to 5.5V, low-power CMOS EPROM technology, a fully static design allowing clock halt, and an internal RC oscillator option to reduce external component count. The device draws microamp-level current in sleep mode and integrates a power-on reset (POR) and watchdog timer (WDT) for reliable unattended operation. The 8-pin footprint makes it one of the smallest PIC microcontrollers in production. The PIC12C509A uses a RISC Harvard architecture with separate program and data buses, an 8-bit data path, and a 12-bit instruction word. EPROM-based program memory allows the device to be erased with UV light through the /JW window and reprogrammed multiple times, making it well suited for prototyping, education, and small-batch industrial designs. The architecture supports a hardware stack and direct/indirect addressing modes, with all instructions executing in a single instruction cycle except for program branches (two cycles). Typical applications include automotive sensor interfaces, industrial control logic, appliance subsystems, security alarm panels, low-end consumer devices, and educational microcontroller coursework. The 8-pin footprint suits retrofits into legacy through-hole designs, and the OTP windowed variant is especially useful during firmware development before committing to the lower-cost OTP (one-time-programmable) production variants like PIC12C509A-04/P or PIC12C509A-04I/SM. When designing with the /JW variant, note that the ceramic windowed package costs roughly 3-5x more than the plastic OTP versions and is intended for development use only. For volume production, migrate firmware to PIC12C509A-04/P (PDIP) or PIC12C509A-04I/SM (SOIC) once code is finalized. The /JW part is marked obsolete by several distributors but remains stocked at niche suppliers for legacy development work. This page synthesizes distributor pricing, same-brand drop-in alternatives from Microchip's PIC12 family, lifecycle status, and practical design notes not assembled in any single manufacturer datasheet, helping engineers decide between the /JW windowed prototype part and modern Flash-based replacements.

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PIC12C509AT-04/SM - 8-Bit 4MHz OTP MCU 1.5KB | Microchip
PIC12C509AT-04/SM

PIC12C509AT-04/SM - 8-Bit 4MHz OTP MCU 1.5KB | Microchip

The Microchip PIC12C509AT-04/SM is an 8-bit CMOS OTP (One-Time Programmable) microcontroller based on Microchip's PIC® 12C architecture, delivering 4 MHz CPU performance with 1.5 KB of program memory (1K x 12 words) in a compact 8-pin SOIJ package. It integrates 41 bytes of RAM, 6 I/O pins, an 8-bit timer/counter (TMR0) with programmable prescaler, a Watchdog Timer (WDT) with its own on-chip RC oscillator, Power-On Reset (POR), and a Device Reset Timer (DRT). What is an 8-bit OTP microcontroller? An 8-bit microcontroller is a small computing system on a single integrated circuit, featuring an 8-bit data path, integrated CPU, memory, and peripherals. The OTP (One-Time Programmable) memory is a type of non-volatile memory that can be written once and cannot be erased, making these MCUs cost-optimized for high-volume embedded products. The PIC® 12C family belongs to the broader category of microcontrollers, which sit within embedded processors and digital ICs in the semiconductor hierarchy. The 'PIC' RISC (Reduced Instruction Set Computer) architecture uses only 33 single-word instructions, simplifying firmware development. Key features of the PIC12C509AT-04/SM include 4 MHz maximum operating frequency with 1 µs instruction execution, 3.0V to 5.5V operating voltage range, internal 4 MHz RC oscillator eliminating the need for external timing components, 6 GPIO pins with high-current sink/source capability, and 1,000,000 erase/write cycle endurance on EPROM. The on-chip peripherals include a real-time clock/counter (TMR0) with 8-bit programmable prescaler, watchdog timer with dedicated RC oscillator for reliable operation, programmable code protection, and in-circuit serial programming (ICSP) capability. The device uses a Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and data access. The CMOS process technology delivers low power consumption suitable for battery-powered applications, and the integrated oscillator reduces external component count. The PIC12C509AT-04/SM is engineered for compact, low-cost embedded designs where its small 8-pin SOIJ footprint and minimal external BOM provide significant PCB area savings. Typical applications include consumer electronics remote controls, small appliance controllers, simple sensor interfaces, battery-operated devices, automotive subsystems (non-safety-critical), and LED lighting controllers. The 8-pin form factor and integrated peripherals make it particularly well-suited for space-constrained designs. When designing with this device, consider that OTP memory cannot be reprogrammed, so code must be fully validated before programming. Decoupling capacitors (typically 0.1 µF) should be placed close to VDD, and unused I/O pins should be configured as outputs to minimize power consumption. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, providing engineers with actionable component selection guidance.

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PIC12C509AT-04/SN - 8-bit 4MHz OTP MCU 1.5KB | Microchip
PIC12C509AT-04/SN

PIC12C509AT-04/SN - 8-bit 4MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC12C509AT-04/SN is an 8-bit CMOS microcontroller from the PIC12C family, featuring 1.5KB (1K x 12) of One-Time Programmable (OTP) program memory, 41 bytes of RAM, and a 4MHz internal oscillator, housed in an 8-pin SOIC (SN) package. The device executes instructions in a 1-microsecond cycle (200ns at 20MHz external oscillator) using Microchip's RISC architecture with only 33 single-word instructions, simplifying embedded firmware development for cost-sensitive applications. Operating from 3.0V to 5.5V over the commercial 0C to +70C range, this IC is built for low-power entry-level embedded designs. An 8-bit microcontroller (MCU) is a small computer-on-a-chip that integrates a CPU, memory (ROM/RAM), and I/O peripherals into a single package. Within the broader taxonomy, the PIC12C509A belongs to the microcontroller family -> 8-bit MCU -> CMOS MCU -> OTP-based MCU -> embedded controller -> semiconductor. MCUs differ from microprocessors (MPUs) by integrating memory and peripherals on-die, enabling compact standalone designs. The PIC12 family specifically targets 8-pin applications where minimal pin count, low cost, and simple peripherals outweigh the need for high performance or large memory. Key features include a programmable 8-bit prescaler on TMR0, Power-On Reset (POR), Device Reset Timer (DRT), a Watchdog Timer (WDT) with its own dedicated on-chip RC oscillator for reliable operation, and programmable code protection. The 6 I/O pins support direct LED drive and digital interfacing, while the internal 4MHz oscillator eliminates the need for an external crystal, reducing BOM cost and board area. The PIC12C509A architecture uses a Harvard-style design with separate program and data buses. The 12-bit-wide instruction word and 8-bit-wide data path optimize code density for small programs. The OTP program memory supports 1,000,000 erase/write cycles per the datasheet, and the device's CMOS implementation provides low power consumption with CMOS input/output characteristics. Typical applications include automotive subsystems, industrial appliance control, consumer entry-level products, battery-powered devices, and remote-control transmitters where the 8-pin footprint and OTP memory provide an optimal cost-to-feature ratio. The integrated WDT and POR features enable reliable unattended operation in harsh electrical environments. When designing with this MCU, choose the 'AT' (tape and reel) and '04' (4MHz) suffixes based on assembly line requirements and clock-speed needs. Ensure the supply voltage stays within 3.0V-5.5V; brown-out conditions may trigger the POR unexpectedly. Programming requires a Microchip PIC programmer (e.g., PICkit) and the device is end-of-life in favor of flash-based PIC12F variants, so design for long-term availability carefully. This page synthesizes verified distributor pricing, drop-in replacement MPNs (PIC12C509A-04/SN, PIC12C509A-04I/SN, PIC12C508A-04/SN), and practical design guidance not found in a single datasheet, making part selection faster for new designs.

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PIC12C509AT-04E/SN - 8-Bit OTP MCU 1.5KB 4MHz SOIC8 | Microchip
PIC12C509AT-04E/SN

PIC12C509AT-04E/SN - 8-Bit OTP MCU 1.5KB 4MHz SOIC8 | Microchip

The Microchip Technology PIC12C509AT-04E/SN is an 8-bit CMOS OTP-based microcontroller from the PIC12C family, featuring 1.5KB (1K x 12) of program memory, 41 bytes of RAM, and 6 I/O pins, operating at 4 MHz and housed in an 8-pin SOIC (SN) package with extended temperature range. An OTP (One-Time Programmable) microcontroller is a type of non-volatile MCU where the program memory can be written exactly once using a programmer device, after which it becomes read-only. Unlike Flash-based MCUs, OTP devices cannot be erased or reprogrammed in-circuit, making them well suited for cost-sensitive, high-volume consumer and industrial applications where the firmware is fixed at production time. The PIC12C509A belongs to the broader hierarchy of 8-bit microcontrollers -> RISC microcontrollers -> embedded MCUs -> integrated circuits, and uses Microchip's PIC RISC architecture, which executes instructions in a single instruction cycle. Key features include 33 single-word instructions, 1 us instruction execution time at 4 MHz, an 8-bit timer/counter, internal 4 MHz RC oscillator (with external clock option), and wide operating voltage range of 2.5V to 5.5V. The device also has a programmable code protection bit, a watchdog timer with on-chip RC oscillator (independent of external clock), and 6 general-purpose I/O pins capable of source/sink up to 25 mA per pin for direct LED drive. The extended temperature grade (-40C to +125C) enables deployment in harsh industrial and automotive under-hood environments. The PIC12C509AT-04E/SN uses a 12-bit instruction word and a Harvard-architecture RISC core with separate instruction and data buses, which lets the CPU fetch an instruction and access data in the same cycle. Compared to older CISC 8-bit MCUs, this architecture delivers roughly 4x the throughput per MHz, allowing the 4 MHz oscillator to deliver the equivalent of a 16 MHz CISC controller. This is critical for battery-powered applications where the MCU clock and CPU activity directly determine average current draw. Typical applications include low-cost consumer appliances, automotive body controllers (lighting, key fobs, sensors), smart sensors, battery chargers, small motor controls, IR remote-control receivers, and standalone timing/logic replacement. The SOIC-8 package and standard programming interface make it an excellent drop-in upgrade for older 8-pin PIC12C508 designs that need additional program memory. When designing with the PIC12C509AT-04E/SN, ensure you use a proper in-circuit serial programming (ICSP) header for the one-time programming step, since OTP memory cannot be re-programmed in-circuit. Decoupling capacitors (100 nF ceramic plus 10 uF bulk) should be placed within 5 mm of the VDD pin to maintain supply integrity during high-current I/O transitions. This page synthesizes distributor stock, drop-in same-package alternatives from the PIC12C family, and practical design notes not found in the manufacturer datasheet alone.

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PIC12C509AT-04I/SM - 8-bit 4MHz 1.5KB OTP MCU SOIJ-8 | Microchip
PIC12C509AT-04I/SM

PIC12C509AT-04I/SM - 8-bit 4MHz 1.5KB OTP MCU SOIJ-8 | Microchip

The Microchip Technology PIC12C509AT-04I/SM is an 8-bit CMOS one-time programmable (OTP) microcontroller from the PIC12C family, delivering 4 MHz CPU clock, 1.5 KB (1K x 12) program memory and 41 bytes of data RAM in a compact 8-pin SOIJ package. An 8-bit microcontroller (MCU) is a small computer-on-a-chip containing a processor core, program memory (ROM/Flash/OTP), data RAM, and a set of peripheral interfaces such as timers, I/O ports and analog channels. The 8-bit PIC12C5xx architecture from Microchip implements a RISC instruction set of only 33 single-word instructions and executes them in 1 µs per instruction cycle at 4 MHz, making it easy to program in assembly or C while leaving enough headroom for tight control loops. Key features include a built-in 8-bit timer/counter (TMR0) with an 8-bit programmable prescaler, power-on reset (POR), device reset timer (DRT), a watchdog timer (WDT) with its own on-chip RC oscillator for reliable operation, and programmable code protection. The 'A' revision of the PIC12C509 improves on the original PIC12C509 baseline with enhanced oscillator options and a wider operating range, while the 'T' suffix denotes tape-and-reel packaging for high-volume assembly. The PIC12C509AT-04I/SM operates from 2.5 V to 5.5 V and supports an industrial temperature range of -40 °C to +85 °C. With 6 general-purpose digital I/O pins multiplexed onto an 8-pin footprint, the device trades analog peripherals for an exceptionally small bill of materials, suiting cost-sensitive applications such as appliance controllers, sensor signal conditioning and logic replacement. The OTP program memory allows one-time programming in production, which lowers unit cost versus flash-based devices. Typical applications include automotive subsystems, white-goods and small-appliance controls, industrial sensors and actuators, consumer entry-level products, and remote-control transmitters. The PIC12C5xx family is widely used as a 'smart glue' logic replacement in designs that need a small amount of decision-making but not the overhead of a larger MCU. When designing with this part, note that OTP memory cannot be re-programmed in the field; use PIC12F or PIC16F equivalents if firmware updates are required. The 8-pin SOIJ package shares a common footprint with PIC10F, PIC12C5xx, and PIC12C6xx devices, enabling migration paths within the PIC10/12/16 ecosystem. This page synthesizes distributor pricing, drop-in alternatives and practical design notes not found in the manufacturer datasheet alone.

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PIC12C509AT-04I/SN - 8-bit OTP MCU, 4MHz, 1.5KB | Microchip
PIC12C509AT-04I/SN

PIC12C509AT-04I/SN - 8-bit OTP MCU, 4MHz, 1.5KB | Microchip

The Microchip Technology PIC12C509AT-04I/SN is an 8-bit CMOS microcontroller from the PIC® 12C family, featuring a 4MHz internal clock, 1.5KB (1K x 12) of One-Time-Programmable (OTP) program memory, 41 bytes of RAM, and 6 I/O pins, all housed in an 8-pin SOIC (SN) package rated for the industrial temperature range. The 'A' revision of the PIC12C509 implements a 12-bit instruction set with 200ns instruction execution time, giving it enough throughput for simple control loops, timing, and user-interface tasks. An 8-bit microcontroller (MCU) is a small computer-on-a-chip that integrates a CPU, RAM, non-volatile program memory, and I/O peripherals on a single die. The PIC® 12C family belongs to the broader 8-bit MCU taxonomy (8-bit microcontroller -> microcontroller -> embedded processor -> semiconductor IC), and uses Microchip's RISC-style Harvard architecture. OTP program memory means the device is programmed once and cannot be electrically erased, making it well suited to high-volume, cost-sensitive end products where firmware is fixed. Key features of the PIC12C509AT-04I/SN include a 4MHz internal oscillator, a 2.5V-5.5V wide supply-voltage range that supports both 3.3V and 5V rails, an 8-bit real-time clock/counter (TMR0) with programmable prescaler, Power-On Reset (POR), Device Reset Timer (DRT), a Watchdog Timer (WDT) with its own on-chip RC oscillator for reliable operation, and programmable code protection. The industrial temperature rating (-40C to +85C) makes it suitable for harsh-environment deployments. Architecturally, the part uses a 14-bit instruction word fetch but a 12-bit instruction set on the PIC12C509A, with a two-stage pipeline and 33 single-word instructions. The 6 I/O pins (GP0-GP5) share an interrupt-on-change capability, and the GP3 pin is input-only. With 41 bytes of data RAM, designs typically offload larger buffers to the EPROM program space or to external peripherals, and the 1000000 erase/write endurance figure applies to the EPROM-based (windowed) cousin rather than this OTP variant. Typical applications include battery chargers, low-end remote controls, automotive courtesy lighting, simple sensor interfaces, fan controllers, and white-goods user-interface boards. Its tiny 8-pin footprint, wide voltage range, and integrated oscillator make it a popular choice for replacing discrete logic and 555-timer circuits in production-grade designs. When designing with this part, pay close attention to the OTP-programming window in your production schedule - parts cannot be field-updated. The industrial-grade 'I' temperature suffix and the SOIC-8 'SN' package support standard 300mil reflow profiles, simplifying PCB assembly. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC12C509T-04/SM - 8-bit MCU, 1.5KB OTP, 4MHz, SOIJ-8 | Microchip
PIC12C509T-04/SM

PIC12C509T-04/SM - 8-bit MCU, 1.5KB OTP, 4MHz, SOIJ-8 | Microchip

The Microchip PIC12C509T-04/SM is an 8-bit CMOS microcontroller built on Microchip's baseline PIC12C core, offering 1.5KB of One-Time-Programmable (OTP) program memory, 41 bytes of RAM, and a 4 MHz internal oscillator in an 8-pin SOIJ surface-mount package. As a member of the PIC12C5xx family, it integrates a RISC-style instruction set, 6 general-purpose I/O pins, a watchdog timer, and a precision 4 MHz internal oscillator, all in a compact SOIJ-8 footprint suited for high-density consumer and industrial designs. A microcontroller (MCU) is a single-chip computer that combines a CPU, non-volatile program memory, volatile data memory, and configurable peripherals on a single die. The PIC12C509T-04 belongs to the baseline 8-bit PIC12 family, which is widely used for simple embedded control, sensor interfacing, and logic replacement. Within the system hierarchy, it sits under: microcontroller -> 8-bit MCU -> PIC12C family -> baseline PIC architecture -> RISC processor -> semiconductor IC. Key features include 33 single-word instructions, a 12-bit wide instruction set, a 2-level hardware stack, and an operating voltage range of 2.5V to 5.5V. The device supports in-circuit serial programming (ICSP) for OTP programming in production environments, and its low-power CMOS design draws only a few milliamps at full speed. Internal brown-out reset, power-on reset, and a watchdog timer provide robustness against firmware runaway and power transients in harsh embedded environments. The 4 MHz internal RC oscillator and 1 us instruction cycle time enable deterministic timing for control loops. Six bidirectional I/O pins (GP0-GP5) are shared with comparator inputs and other functions, allowing the chip to directly drive relays, LEDs, MOSFET gates, and sensor signal conditioning circuits. The OTP program memory supports code protection for IP security. Typical applications include consumer appliance control, battery chargers, fan controllers, low-end security keypads, sensor interface modules, and small appliance timers. The wide 2.5V-5.5V supply range simplifies designs powered by 3V button cells, USB-derived 5V, or unregulated 5V adapters. When designing with the PIC12C509T-04/SM, always provide a 0.1 uF decoupling capacitor directly between VDD and VSS within 5 mm of the pins. The MCLR pin requires a properly-bounded reset network - never leave MCLR floating in noise-prone environments. The 'T' suffix denotes tape-and-reel packaging, and the '/SM' suffix indicates the 8-pin SOIJ package. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the standalone manufacturer datasheet - enabling faster design-in and procurement decisions.

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PIC12C509T-04I/SM - 8-Bit 4MHz MCU 1.5KB OTP | Microchip
PIC12C509T-04I/SM

PIC12C509T-04I/SM - 8-Bit 4MHz MCU 1.5KB OTP | Microchip

The Microchip Technology PIC12C509T-04I/SM is an 8-bit baseline PIC microcontroller in an 8-pin SOIJ package, operating at up to 4 MHz with 1.5 KB of one-time programmable (OTP) program memory organized as 1K x 12 words and 41 bytes of data RAM. The device features six general-purpose I/O pins, an internal 4 MHz oscillator, a power-on reset (POR) circuit, and a watchdog timer (WDT) for reliable embedded control in compact form factors. The "T" suffix indicates tape-and-reel packaging and the "I" suffix specifies the industrial temperature range of -40C to +85C. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripherals onto one die, optimized for deterministic control tasks. The PIC12C509 family belongs to Microchip's baseline PIC12C architecture, which uses a RISC-like instruction set with only 33 single-word/single-cycle instructions. This positions the PIC12C509 at the bottom of the PIC family hierarchy (baseline PIC12 -> mid-range PIC16 -> enhanced mid-range PIC16 -> PIC18 -> PIC24/dsPIC), offering the smallest package count and lowest cost for cost-sensitive, space-constrained applications. Key features include a 2.5V to 5.5V supply voltage range that allows direct operation from a single lithium cell or 3.3V/5V regulated rails, 200 ns instruction execution time, a programmable code protection bit, and an internal RC oscillator that eliminates the need for external clock components. The OTP program memory enables fast prototyping and short production runs without the tooling investment required for mask-ROM parts. Architecturally, the PIC12C509 uses a 12-bit instruction word with a two-stage pipeline, separate instruction and data buses (Harvard architecture), and a hardware stack for subroutine nesting. The 6 I/O pins are multiplexed with the GP3 input and the MCLR reset, providing flexible pin assignment for digital I/O, timer-driven events, and external interrupts. Typical applications include consumer appliance control, battery-powered sensor nodes, automotive interior accessories, LED driving, simple motor control, and replaceable logic in legacy designs. The wide voltage range and industrial temperature grade make it especially well-suited for harsh-environment embedded modules. When designing with this device, allocate sufficient OTP programming margin for late-stage firmware changes and ensure the GP3 pin is configured correctly because it is input-only. The internal oscillator is factory-trimmed but allows no further in-circuit calibration, so timing-sensitive designs should use the external oscillator mode. This page synthesizes distributor pricing, drop-in alternatives from the PIC12C5xx family, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single reference for cross-referencing the part against PIC12C509A and PIC12C508A family variants.

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PIC12C671-04/P - 8-Bit 4MHz OTP MCU w/ ADC | Microchip | PDIP-8
PIC12C671-04/P

PIC12C671-04/P - 8-Bit 4MHz OTP MCU w/ ADC | Microchip | PDIP-8

The Microchip Technology PIC12C671-04/P is an 8-bit CMOS one-time-programmable (OTP) microcontroller based on the PIC RISC architecture, integrating a 4-channel 8-bit A/D converter, 1.75KB (1024 x 14) of program memory, 128 bytes of RAM, and six general-purpose I/O pins in an 8-pin PDIP package. It operates from a 3.0V to 5.5V supply at clock speeds up to 4MHz, executing instructions in a 1-microsecond cycle (200ns at 20MHz for higher-speed grades). Per the verified DigiKey listing, the part is qualified ACTIVE and ships as the 8-PDIP variant. What is an 8-bit OTP microcontroller? An 8-bit OTP microcontroller is a small, low-cost, single-chip computer with a CPU datapath of 8 bits, on-chip non-volatile program memory that is one-time-programmable (can be written once and not erased), RAM for variables, integrated peripherals such as A/D converters, timers, and digital I/O. PIC microcontrollers sit within the broader taxonomy: 8-bit MCU -> microcontroller -> embedded controller -> semiconductor IC. The 12C family represents Microchip's mid-range baseline of OTP PIC MCUs in 8-pin packages. The PIC12C671-04/P features a RISC CPU with only 35 single-word instructions, a hardware multiplier-free 8-bit ALU, 4MHz maximum clock at 4V-5.5V (or 10MHz at the same range for -10 speed grades), and DC to 4MHz operation at 3V-5.5V. On-chip peripherals include a 4-channel 8-bit ADC, an 8-bit timer/counter with 8-bit prescaler, a Watchdog Timer with its own on-chip RC oscillator, and a power-on reset. The 6 I/O pins are individually direction-controlled and provide 25mA source/sink capability per pin, sufficient to drive LEDs directly. Typical applications for this device include low-cost consumer appliances, sensor signal conditioning with ADC readback, simple state machines for appliance control, battery chargers, automotive interior accessories (non-AEC-Q100 qualified), and any general-purpose 8-pin embedded control. The OTP memory suits production volumes where in-field firmware updates are not required. When designing with this part, observe that the OTP memory requires one-time programming at production; budget for an emulator (PIC12C671 ICD or ICE) during development. The 6 I/O pins are shared with the ADC, so plan analog channel assignments carefully. The internal RC oscillator can be used or an external crystal/RC selected via configuration bits.

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PIC12C671-04E/P - 8-bit 4MHz OTP MCU, 1.75KB | Microchip
PIC12C671-04E/P

PIC12C671-04E/P - 8-bit 4MHz OTP MCU, 1.75KB | Microchip

The Microchip Technology PIC12C671-04E/P is an 8-bit CMOS RISC microcontroller from the PIC12C family, featuring 4 MHz maximum operating frequency, 1.75 KB (1K x 14) of one-time-programmable (OTP) program memory, 128 bytes of RAM, and 6 I/O pins, all integrated in an 8-pin PDIP through-hole package. The "-04E" speed/temperature suffix indicates a 4 MHz oscillator grade with the extended industrial temperature range (-40C to +125C), while "/P" denotes the PDIP-8 package supplied in tube packaging. An 8-bit microcontroller (MCU) is a small computer-on-a-chip integrating a CPU, memory, and peripherals. It belongs to the broader category of microcontrollers -> embedded processors -> semiconductors. PIC12C-series parts use Microchip's Harvard-architecture RISC core with 35 single-word instructions, delivering ~400 ns instruction execution at 4 MHz. PIC microcontrollers are widely used in cost-sensitive, low-pin-count embedded applications. Key features of the PIC12C671-04E/P include an integrated 4-channel 8-bit analog-to-digital converter (ADC), 8-bit timer/counter with programmable prescaler, internal 4 MHz RC oscillator (calibrated), an internal voltage reference, and an on-chip watchdog timer for reliable operation. The device operates from 3.0V to 5.5V and includes power-managed modes such as SLEEP for low-power standby. Its CMOS RISC architecture provides deterministic timing and low power consumption typical of PIC12C-series devices. Typical applications include automotive body controllers, appliance control boards, sensor signal conditioning, low-cost consumer electronics, and industrial automation where small pin count, OTP memory, and extended temperature tolerance matter. The device's 4-channel ADC simplifies analog sensor interfaces, and the 6 GPIO pins enable direct connection to switches, LEDs, and serial interfaces (via bit-banging). When designing with this MCU, choose clock source (internal RC or external crystal/RC) carefully - the internal calibrated RC eliminates external components. Reserve one I/O pin for ICSP (In-Circuit Serial Programming) if in-field firmware updates are needed. Decouple VDD with a 100 nF ceramic capacitor placed close to the pin. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.

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PIC12C671-04I/MF - 8-Bit 4MHz OTP MCU 1.75KB | Microchip
PIC12C671-04I/MF

PIC12C671-04I/MF - 8-Bit 4MHz OTP MCU 1.75KB | Microchip

The Microchip Technology PIC12C671-04I/MF is an 8-bit PICmicro® CMOS microcontroller based on the RISC architecture, featuring 1.75KB (1K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 5 I/O pins. The device is housed in an 8-pin DFN-S exposed-pad (6x5 mm) surface-mount package and operates from 3.0V to 5.5V at a maximum clock rate of 4MHz. The industrial-grade -04I temperature rating covers -40°C to +85°C operation. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, RAM, and peripheral interfaces into one package. The PIC12C671 belongs to the PIC12 family of 8-bit RISC microcontrollers, sitting within Microchip's hierarchy of 8-bit MCUs -> microcontrollers -> microprocessors -> embedded computing ICs. This category of device is used to implement programmable logic, sensor reading, and control loops in cost- and space-constrained designs. Key features of the PIC12C671-04I/MF include a 4MHz internal oscillator, on-chip Power-On Reset (POR), Watchdog Timer (WDT), and a 35-instruction instruction set with 12-bit-wide opcodes. The 8-bit RISC CPU executes most instructions in a single 1µs instruction cycle (at 4MHz Fosc), enabling deterministic real-time control. The integrated 4-channel 8-bit ADC supports analog signal acquisition without external components, and the device supports in-circuit serial programming (ICSP) for field updates. Typical applications include low-power embedded control nodes, consumer appliance user interfaces, sensor signal conditioning, LED driver controllers, automotive body electronics, and battery-powered remote controls. The PIC12C671-04I/MF is pin-compatible with the rest of the PIC12C67x family, allowing in-system migration to PIC12CE67x parts that add on-chip EEPROM. When designing with this part, allocate PCB copper area to the exposed thermal pad beneath the DFN package for proper heat dissipation. The OTP program memory requires the firmware image to be loaded at the factory or via ICSP before deployment; for prototypes requiring repeated erase/write cycles, consider the PIC12F675 flash-based counterpart in the same DFN-S package. This page synthesizes distributor pricing, drop-in alternative MPNs, and practical design notes not found in the standalone Microchip datasheet, helping engineers source and qualify the PIC12C671-04I/MF for production.

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PIC12C671-04I/P - 4MHz 8-Bit OTP MCU, 1.75KB | Microchip
PIC12C671-04I/P

PIC12C671-04I/P - 4MHz 8-Bit OTP MCU, 1.75KB | Microchip

The Microchip Technology PIC12C671-04I/P is an 8-bit CMOS OTP microcontroller built on Microchip's PIC RISC architecture, delivering 4 MHz CPU performance (250 ns instruction cycle) with 1.75 KB (1K x 14) of program memory, 128 bytes of RAM, and an integrated 8-bit 4-channel A/D converter in an 8-pin PDIP through-hole package. It exposes 6 I/O pins on an 8-pin footprint and operates from 2.5V to 5.5V, with the -04I/P industrial-temperature grade rated from -40C to +85C. An 8-bit microcontroller (MCU) is a single-chip computer with an 8-bit data path, ALU, program memory, data memory, and peripheral set, intended to handle control and simple DSP tasks in embedded systems. PIC microcontrollers belong to the Harvard-architecture RISC MCU family, separated by the parent category of microcontrollers within Integrated Circuits. The PIC12C family is Microchip's baseline 8-pin line, positioned below PIC16 and PIC18 families for cost-sensitive applications. PIC12C671-04I/P is an OTP (one-time-programmable) variant, meaning program memory is written once and is not electrically erasable; the Flash-based counterpart is the PIC12F675, which is recommended by Microchip as the modern replacement. Key features include 35 single-word instructions, 8-bit timer/counter (TMR0) with 8-bit prescaler, watchdog timer with on-chip RC oscillator, power-on reset, power-saving Sleep mode, in-circuit serial programming (ICSP), and four analog input channels multiplexed onto GP0/GP1/GP3/GP4. The 4 MHz oscillator option (-04) supports a 1 us instruction execution time at 4 MHz. Brown-out reset is not present on the PIC12C671; the chip relies on power-on reset and the internal RC watchdog for reliable startup. The 6 I/O pins each source/sink up to 25 mA, sufficient to drive LEDs directly. Typical applications include battery chargers, security systems, remote transmitters, low-end sensors, smart cards, and small appliance controls. The integrated ADC eliminates the need for an external analog front end in simple sensor-interface designs. Industrial users favor the -04I/P variant for its wide temperature range and through-hole PDIP packaging that simplifies hand-prototyping and field repair. When designing with the PIC12C671-04I/P, allocate one I/O pin (GP3) as the ICSP clock and another (GP1) as ICSP data when in-circuit programming is required. Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of the pin. For analog readings, add a 100 nF + 10 uF decoupling pair and an RC anti-aliasing filter on each analog input. Note that OTP parts cannot be firmware-updated in the field, so design with a Flash equivalent (PIC12F675) if post-production reprogramming is required. This page combines distributor pricing, drop-in same-package alternatives, and engineering design notes that complement but do not replace the manufacturer datasheet.

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PIC12C671-10/P - 8-bit OTP MCU 1.75KB 10MHz 6 I/O | Microchip
PIC12C671-10/P

PIC12C671-10/P - 8-bit OTP MCU 1.75KB 10MHz 6 I/O | Microchip

The Microchip PIC12C671-10/P is an 8-bit CMOS OTP-based microcontroller built on the PIC architecture, delivering 10MHz (10 MIPS) performance from a Harvard RISC core with only 35 single-word instructions. The device integrates 1.75KB of one-time-programmable program memory, 128 bytes of RAM, 6 digital I/O pins, and a 4-channel 8-bit ADC into an 8-pin PDIP (through-hole) package. Operating from 3.0V to 5.5V with industrial temperature range support, the PIC12C671-10/P targets cost-sensitive embedded designs that need deterministic real-time performance. An 8-bit microcontroller (MCU) is a single-chip computer containing a CPU, non-volatile program memory, working RAM, and configurable peripherals designed for embedded control. MCUs sit beneath microprocessors in the system hierarchy (microprocessor -> microcontroller -> SoC -> semiconductor) and are the dominant building block of consumer, industrial, and automotive electronics. Within the 8-bit class, the PIC12C family occupies the low-pin-count, OTP-programmable niche and is widely used where field reprogramming is unnecessary and unit cost is paramount. Key features include 4MHz internal RC oscillator option (selected at programming), 4-channel 8-bit ADC with programmable reference, one 8-bit timer/counter plus one Watchdog Timer, 6 bidirectional I/O pins shared with ADC inputs, power-on reset, brown-out detect, and in-circuit serial programming (ICSP). The 8-pin PDIP footprint enables retrofit into legacy designs and breadboard prototyping without surface-mount tooling. The PIC12C671 employs a 14-bit instruction word with Harvard bus architecture (separate program and data paths), which fetches and executes each instruction in 400 nanoseconds at 10MHz. Compared to von-Neumann CISC designs of equivalent pin count, this yields roughly 2:1 throughput per MHz while consuming only milliamps at 5V, 4MHz typical. The architecture also supports interrupt-driven design with a single hardware interrupt vector. Typical use cases include appliance control front-ends, sensor signal conditioning front-ends, LED driving controllers, simple battery chargers, toys, and remote-control encoder logic. The OTP memory makes the part suited for high-volume production where firmware is stable and traceability of programmed parts is acceptable. For field-upgradable firmware, the PIC12F675 flash variant in the same 8-pin footprint is the recommended migration path; Microchip explicitly recommends PIC12F675 on its product page. When designing with this part, ensure MCLR is tied to VDD through a 10kΩ resistor (or driven by the programmer for ICSP), and supply the ADC reference voltage via a low-impedance source to prevent conversion errors. Decouple VDD with 100nF minimum placed within 5mm of the supply pin. This page synthesizes distributor pricing, drop-in same-package alternatives (PIC12C671T-10E/P, PIC12C671-04/P), and practical design notes not found in the manufacturer datasheet summary.

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PIC12C671-10/SM - 8-bit MCU 1.75KB OTP 10MHz SOIJ-8 | Microchip
PIC12C671-10/SM

PIC12C671-10/SM - 8-bit MCU 1.75KB OTP 10MHz SOIJ-8 | Microchip

The Microchip Technology PIC12C671-10/SM is an 8-bit PIC12C-series CMOS microcontroller with 1.75KB (1K x 14) OTP program memory, 128 bytes of RAM, an integrated 8-bit A/D converter, and a 10MHz internal instruction clock (400ns instruction cycle), all packaged in an 8-pin SOIJ surface-mount package. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/OTP/Flash), data memory (RAM), and peripherals such as timers, communication interfaces, and analog-to-digital converters on a single die. Within the embedded-system taxonomy, an MCU belongs to the broader category of microprocessors -> computing ICs -> integrated circuits. The PIC12C67X family specifically targets cost-sensitive 8-pin applications where board area and BOM count must be minimized. Key features include a RISC architecture with only 35 single-word instructions, an on-chip 4-channel 8-bit ADC, an internal 4MHz RC oscillator (selectable), a wide operating voltage range of 2.5V to 5.5V, and ultra-low-power operation with <1µA typical standby current. The SOIJ-8 (Small Outline IC, J-leaded) package is the surface-mount variant of the 8-pin DIP form factor used by Microchip's baseline PIC12Cxx family. The PIC12C671 uses a Harvard-architecture RISC core with separate program and data buses, executing one instruction per instruction cycle (4 clock cycles). The 10MHz rating (10 suffix) corresponds to a 10MHz oscillator input and a 2.5 MIPS instruction throughput. The OTP (one-time-programmable) program memory is programmed with the final firmware and cannot be erased, which suits production-grade deployments but not prototyping. Typical applications include appliance controls, sensor signal conditioning, LED driver controllers, remote transmitters, and battery-powered instruments. The 8-pin SOIJ format is well-suited for compact surface-mount designs and is footprint-compatible with the PIC12C672/PIC12CE673/PIC12CE674 family members, easing migration paths. When designing with this device, ensure the MCLR reset line has a proper pull-up and that ADC input source impedance stays below 10kΩ for adequate acquisition time. Designers should also note that this part is recommended for new designs to use the PIC12F675 instead, which offers Flash memory and enhanced peripherals in a similar footprint. This page synthesizes distributor pricing, drop-in alternatives drawn from Microchip's PIC12 family and cross-brand references, and practical design notes not aggregated on a single manufacturer page.

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PIC12C671-10E/P - 8-bit MCU, 1.75KB OTP, 10MHz, 8-PDIP | Microchip
PIC12C671-10E/P

PIC12C671-10E/P - 8-bit MCU, 1.75KB OTP, 10MHz, 8-PDIP | Microchip

The Microchip Technology PIC12C671-10E/P is an 8-bit CMOS RISC microcontroller with 1.75KB of one-time-programmable (OTP) program memory, 128 bytes of RAM, six I/O pins, and an integrated 8-bit A/D converter, housed in an 8-pin PDIP (through-hole) package rated for 10MHz operation and the extended industrial temperature range. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces on one IC. The PIC12C671 belongs to the Microchip PIC12 family of baseline/Mid-Range 8-bit RISC microcontrollers, sitting within the hierarchy: 8-bit MCU -> RISC microcontroller -> embedded controller -> semiconductor IC. It uses a 14-bit instruction word, Harvard architecture, and a 35-instruction set designed for deterministic, compact code generation. Key features include 1.75KB (typically 1024 x 14-bit words) of OTP program memory, 128 bytes of data RAM, a 4-channel 8-bit A/D converter with internal bandgap reference, an 8-bit timer/counter (TMR0), a Watchdog Timer with its own on-chip RC oscillator, an internal 4MHz RC oscillator, and an external interrupt source. The device operates across 2.5V to 5.5V (3.3V/5V operation explicitly supported), consumes very low operating current, and is offered in the industrial/automotive temperature grade (the "E" suffix in the part number denotes extended temperature range). Architecturally, the PIC12C671 is fully static and uses a two-stage pipeline to fetch and execute instructions in a single cycle (except branches). The integrated peripherals, including the A/D converter with selectable reference sources, allow direct interface to analog sensors without external signal-conditioning components, making the device well-suited to small-form-factor embedded products where PCB real estate is at a premium. Typical applications include battery chargers, sensor signal conditioning, appliance control, security systems, automotive body electronics, and small consumer devices. The wide operating voltage range and integrated A/D converter particularly suit battery-powered or sensor-interface applications. When designing with this part, note that the OTP memory is one-time programmable; for development, use a windowed (JW) or Flash variant (PIC12F675 is the recommended modern replacement per Microchip's product page). The device requires proper configuration word programming, including oscillator selection and Watchdog Timer enable/disable. This page synthesizes Microchip product specifications, current distributor pricing as of 2026-09-15, drop-in replacement alternatives, and practical design guidance not consolidated on any single datasheet page.

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PIC12C671-10I/MF - 8-Bit 10MHz OTP MCU, 8-DFN-S | Microchip
PIC12C671-10I/MF

PIC12C671-10I/MF - 8-Bit 10MHz OTP MCU, 8-DFN-S | Microchip

The Microchip Technology PIC12C671-10I/MF is a 8-bit RISC PIC microcontroller with 1.75KB (1K x 14) One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and an integrated 4-channel 8-bit ADC, packaged in an 8-pin VDFN Exposed Pad (6x5 mm) surface-mount package. It executes instructions at up to 10MHz and operates from a 3.0V to 5.5V supply across the industrial temperature range of -40C to +85C. A PIC microcontroller (Programmable Interface Controller) is a Harvard-architecture 8-bit MCU family from Microchip Technology that combines a RISC CPU core, non-volatile program memory, RAM, and integrated peripherals such as timers, ADC, and comparators into a single IC. Within the broader embedded hierarchy, PIC MCUs sit under the umbrella of microcontrollers, which themselves belong to integrated circuits and to the semiconductor product family. The PIC12C6xx sub-family is positioned as one of the smallest and lowest-pin-count PIC offerings, optimized for compact, cost-sensitive applications where small PCB area and minimal external component count matter most. Key specifications for the PIC12C671-10I/MF include 5 digital I/O pins (the remaining pins are dedicated to VDD, VSS, MCLR, and OSC), an internal RC oscillator, an internal Power-on Reset (POR) circuit, a Watchdog Timer (WDT) for code integrity, and an 8-bit ADC with 4 input channels. The device uses the standard mid-range PIC14 instruction set (35 instructions), providing predictable timing and deterministic code execution well suited to real-time control loops. Architecturally, the PIC12C671 separates program and data buses (Harvard), allowing simultaneous instruction fetch and operand access. The OTP program memory is one-time programmable, meaning each unit is dedicated to a single firmware image - ideal for production runs. Built-in peripherals such as the 8-bit ADC and timer reduce BOM count, and the internal oscillator eliminates the need for an external crystal in many designs, allowing a complete application to be realized with the IC and a few passive components. Typical applications for the PIC12C671-10I/MF include battery chargers, smart sensors, low-end appliance controllers, personal-care devices, automotive interior lighting modules, and simple closed-loop control subsystems such as fan speed controllers and small DC motor drivers. Designers also deploy the part in edge-of-network IoT sensor nodes where 8-bit processing is sufficient. When designing with this device, attention should be paid to the OTP memory constraint - firmware must be finalized before production programming, since OTP cannot be reprogrammed in-circuit. Programming is performed via the ICSP interface using tools such as MPLAB PM3. Adequate decoupling and proper layout of the exposed thermal pad to the ground plane will improve ADC noise performance. This page synthesizes distributor pricing from DigiKey and Mouser, drop-in same-package alternatives from the PIC12C family, and practical design notes that are not found in the standalone manufacturer datasheet.

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PIC12C671/JW - 8-bit MCU, 1.75KB EPROM, 10MHz, 8-CDIP | Microchip
PIC12C671/JW

PIC12C671/JW - 8-bit MCU, 1.75KB EPROM, 10MHz, 8-CDIP | Microchip

The Microchip Technology PIC12C671/JW is a 8-bit RISC CMOS microcontroller with 1.75 KB (1K x 14) of UV-erasable EPROM program memory, 128 bytes of RAM, and 5 programmable I/O pins plus one input-only pin, housed in an 8-pin Ceramic DIP (CDIP) with an erase window. The device runs up to 10 MHz (400 ns instruction cycle) from a 3.0 V to 5.5 V supply at commercial 0 °C to 70 °C temperature grade. The /JW suffix indicates the ceramic windowed package, designed for prototyping and field-reprogrammable flows where code must be erased under UV light. What is a PIC12C-series microcontroller? The PIC12C67X family belongs to Microchip's PIC microcontrollers, which are 8-bit RISC Harvard-architecture MCUs with integrated peripherals. PIC12C parts use a 14-bit instruction word and sit in the low-pin-count (8-pin) category, bridging the gap between discrete logic and larger 16- and 32-bit microcontrollers. They are widely used as glue logic, sensor conditioners, and standalone controllers where a few I/O pins plus on-chip A/D conversion replace a handful of analog and digital ICs. Key features of the PIC12C671 include four channels of 8-bit A/D conversion (replacing external ADCs in many designs), 128 bytes of SRAM, an 8-bit timer/counter (TMR0) with 8-bit programmable prescaler, and a watchdog timer with on-chip RC oscillator for reliable operation. The device provides five I/O pins with individual direction control, internal pull-ups selectable via software (GPPU bit), and current sink/source capability suitable for direct LED drive. Architecturally, the PIC12C671 uses a Harvard bus with separate program and data paths, an 8-level deep hardware stack, and a single-cycle instruction decoder that keeps most instructions executing in one instruction cycle (400 ns at 10 MHz). This deterministic instruction timing makes the part predictable for real-time control loops without pipeline stalls. Typical applications include low-cost sensor interfaces, battery chargers, small appliance controllers, automotive body modules (industrial-grade variants), and any drop-in upgrade path from PIC12C508/509 designs needing more program memory and on-chip A/D conversion. The windowed package supports iterative firmware development where code is repeatedly erased and reprogrammed during validation. When designing with this part, note that the 8-CDIP windowed package has a ceramic lid that must be removed for UV erasure; field-deployed units should migrate to the OTP version (PIC12C671/P) or the recommended successor PIC12F675 (Flash-based, lower cost). Per the manufacturer datasheet, programming requires the PRO MATE II or PICSTART Plus with an 8-pin DIP adapter. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.

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PIC12C671T-04E/SM - 4MHz 8-bit OTP MCU, 1.75KB | Microchip
PIC12C671T-04E/SM

PIC12C671T-04E/SM - 4MHz 8-bit OTP MCU, 1.75KB | Microchip

The Microchip PIC12C671T-04E/SM is an 8-bit RISC microcontroller in the PIC12C family, featuring 1.75KB (1K x 14 words) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, an integrated 8-bit A/D converter, and 6 programmable I/O lines, all housed in an 8-pin SOIJ (SM) package rated for the extended industrial temperature range. The "-04" suffix designates a 4MHz maximum clock, the "E" indicates the extended (-40C to +125C) temperature grade, the "T" denotes tape-and-reel packaging, and "/SM" specifies the 8-SOIJ surface-mount package. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, I/O peripherals, and often analog blocks into one IC. Within the broader hierarchy, the PIC12C671 belongs to the 8-bit PIC family -> PIC12C sub-family -> PIC12C67x series -> microcontroller -> embedded microcontroller -> semiconductor IC. MCUs execute user firmware stored in non-volatile memory and are the central control element in virtually every embedded product, from automotive sensors to consumer appliances. The PIC12C671T-04E/SM is built on Microchip's PIC RISC architecture with only 33 single-word instructions, most executing in a single instruction cycle. Its integrated peripherals include an 8-bit successive-approximation A/D converter with four multiplexed input channels, an 8-bit timer/counter (TMR0) with an 8-bit prescaler, a watchdog timer with its own on-chip RC oscillator, and a power-on reset / brown-out detection circuit. Programmable code protection and an In-Circuit Serial Programming (ICSP) interface simplify field updates. Typical applications include low-pin-count embedded controllers, sensor signal conditioning, battery chargers, automotive body and chassis nodes (extended temp), small appliance controls, and any space-constrained design requiring A/D conversion. The pic12c671T-04E/SM is well suited for cost-sensitive, low-complexity logic replacement and analog front-end digitization where its 4MHz instruction rate is sufficient. When designing with this device, note that it operates from 3.3V to 5.5V; programmers such as the MPLAB PM3 or PICkit are required for OTP programming. In-Circuit Serial Programming (ICSP) requires only two I/O lines plus VDD/VSS, allowing firmware to be loaded after PCB assembly. Decouple VDD with a 0.1uF ceramic capacitor placed within 5 mm of the pin. This page synthesizes verified distributor pricing, drop-in same-family alternatives, design notes, and parametric comparisons not found in the manufacturer datasheet alone.

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PIC12C671T-04I/SM - 8-Bit OTP MCU, 4MHz, 1.75KB | Microchip
PIC12C671T-04I/SM

PIC12C671T-04I/SM - 8-Bit OTP MCU, 4MHz, 1.75KB | Microchip

The Microchip PIC12C671T-04I/SM is an 8-bit, fully-static CMOS microcontroller with an integrated 8-bit A/D converter, 1.75KB (1K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 6 programmable I/O pins, all housed in an 8-pin SOIJ (SM) package. It operates at a maximum clock speed of 4 MHz, supports supply voltages from 3.0 V to 5.5 V, and is qualified for the industrial temperature range of -40C to +85C, making it well-suited for cost-sensitive embedded control tasks. What is a PIC 8-bit microcontroller? A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory (ROM/OTP/Flash), volatile data memory (RAM), and a configurable set of peripheral interfaces such as I/O ports, timers, and analog-to-digital converters (ADCs). The PIC12C67x family belongs to Microchip's mid-range 8-bit RISC architecture, which is widely used in consumer appliances, automotive subsystems, industrial sensors, and battery-powered instruments. Within the broader semiconductor taxonomy, it sits as: PIC12C671 -> PIC12C family -> PIC10/12/16 mid-range -> 8-bit MCU -> microcontroller -> integrated circuit. Key features include 35 single-word instructions (200 ns instruction cycle at 4 MHz), 8-bit ADC with 4 input channels, four oscillator options (RC, LP, XT, HS), an 8-bit real-time clock/counter with 8-bit prescaler, and a watchdog timer for reliable unattended operation. The OTP program memory supports in-circuit programming via Microchip's ICSP interface, while the brown-out detect and power-on reset blocks provide robust supply-voltage supervision. Maximum power dissipation is specified at 700 mW. The architecture combines a Harvard-bus CPU with a 14-bit instruction word and separate 8-bit data path, which is characteristic of the mid-range PIC families. The integrated ADC uses successive-approximation register (SAR) conversion with 8-bit resolution, suitable for low-bandwidth sensor sampling such as thermistor bridges, potentiometers, and battery monitors. The device supports in-system debugging through Microchip's ICD and the MPLAB PM3 programmer, which work with the entire PIC12C6xx line. Typical applications include appliance control boards, sensor signal conditioning, simple closed-loop fan or pump controllers, automotive interior accessories, battery chargers, security keypads, and low-cost consumer products. The 6 I/O pins are sufficient for driving small relays, LED indicators, and UART-style bit-banged communication. A key design consideration is OTP vs Flash: because the PIC12C671 uses one-time-programmable memory, firmware must be fully validated before programming - the part cannot be reprogrammed in the field. Designs targeting field upgrades should consider the PIC12F/F67x Flash-based siblings. The SOIJ (SM) package is a small-outline IC with J-leads, suitable for both hand-soldered prototypes and high-volume SMT lines. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes - information not consolidated in the manufacturer datasheet alone.

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PIC12C671T-10/SM - 8-Bit 10MHz OTP MCU with ADC | Microchip
PIC12C671T-10/SM

PIC12C671T-10/SM - 8-Bit 10MHz OTP MCU with ADC | Microchip

The Microchip Technology PIC12C671T-10/SM is an 8-bit, 10MHz CMOS RISC microcontroller in the PIC12C67x family, packaged in an 8-pin SOIJ (also referenced as 8-SOIC 5.30mm width) and featuring 1.75KB (1K x 14 words) of One-Time Programmable (OTP) program memory, 128 bytes of RAM, six general-purpose I/O pins, and an on-chip 8-bit analog-to-digital converter. The /SM suffix denotes the surface-mount SOIJ package and the T-suffix denotes tape-and-reel packaging for high-volume assembly lines. What is a PIC microcontroller? A PIC (Peripheral Interface Controller) is a family of 8-, 16-, and 32-bit RISC-based microcontrollers originally designed by General Instrument's microelectronics division and now produced by Microchip Technology. PIC MCUs sit in the broader hierarchy of embedded microcontrollers -> microcontrollers -> processors -> semiconductors, and the PIC12C family specifically targets low-pin-count, low-cost applications where a few I/O lines plus on-chip analog or EEPROM are sufficient. The PIC12C671 uses a 14-bit instruction word and a Harvard architecture with separate program and data buses, enabling most instructions to execute in a single instruction cycle at the 10MHz oscillator rate. The integrated 8-bit ADC provides up to four analog input channels with multiplexed I/O, suitable for sensor conditioning, battery monitoring, and simple control loops. Power-saving features include a SLEEP mode, a Watchdog Timer with its own on-chip RC oscillator, and an operating voltage range of 2.5V to 5.5V. Typical applications include appliance controllers, low-end remote controls, sensor signal conditioning, LED driving, automotive body modules (where temperature grade allows), and battery-powered toys. With only six I/O pins and OTP program memory, the PIC12C671 is best suited for fixed-function designs where the firmware is finalized before volume production and code-update capability is not required. When designing with this device, note that OTP memory cannot be re-programmed, so firmware must be fully validated before production programming. Decoupling capacitors (typically 0.1uF plus 10uF bulk) should be placed close to VDD, and unused I/O pins should be configured as outputs to minimize power consumption in SLEEP mode. The on-chip oscillator supports internal RC mode at 4MHz or external crystal/clock up to 10MHz. This page synthesizes distributor pricing, drop-in same-package alternatives (same SOIJ-8 footprint) and practical design considerations that go beyond what is found in the bare manufacturer datasheet, so engineers and procurement teams can make faster, better-informed decisions.

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PIC12C671T-10E/SM - 8-Bit 10MHz OTP MCU with ADC | Microchip
PIC12C671T-10E/SM

PIC12C671T-10E/SM - 8-Bit 10MHz OTP MCU with ADC | Microchip

The Microchip Technology PIC12C671T-10E/SM is an 8-bit CMOS RISC microcontroller based on the PIC12 core, delivering 10 MIPS throughput at a 10 MHz oscillator in an 8-pin SOIJ surface-mount package. It integrates 1.75 KB (1K x 14) of One-Time Programmable (OTP) program memory and 128 bytes of RAM, plus a 4-channel 8-bit analog-to-digital converter, a watchdog timer, and power-on reset. The tape-and-reel 'T' suffix and 'SM' package code identify the SOIJ-8 production form factor. An 8-bit microcontroller (MCU) is a single-chip computer that combines a CPU, program memory, data memory, and peripherals on one die, designed for embedded control tasks where deterministic timing, low cost, and small footprint matter more than raw compute throughput. Within the broader taxonomy, the PIC12C671 sits in the hierarchy MCU -> 8-bit microcontroller -> PIC12 family -> Microchip PIC microcontrollers, and is generally classified as a baseline-class PIC designed for cost-sensitive analog and I/O-centric applications. Key features include instruction execution in a single 200 ns cycle at 10 MHz, six general-purpose I/O pins shared with analog inputs, an internal 4 MHz RC oscillator option, a programmable code-protection scheme, and a wide 3.0 V to 5.5 V supply range. In-system serial programming is supported via GP0/GP1, allowing firmware updates after PCB assembly. The OTP program memory is factory-programmable and cannot be erased, making this part suitable for low-to-medium volume production. Architecturally, the PIC12C671 uses a Harvard RISC core with separate program and data buses, providing deterministic interrupt response and single-cycle instruction execution. Its CMOS design delivers low power consumption with typical active current of a few milliamperes, suitable for always-on or battery-backed designs where power budget is tight. Typical applications include appliance control front-ends, sensor signal conditioning, automotive body modules, simple closed-loop fan or valve controllers, and battery chargers that require local A/D conversion. Designers select this part when they need analog sensing plus a small glue-logic footprint in fewer than 10 pins. A critical design consideration is the OTP memory: the program is locked in after the first write and cannot be changed, so the firmware must be fully validated before programming. Designers should also budget for the programming adapter cost (e.g., MPLAB PM3) in low-volume prototypes, and consider migrating to the flash-based PIC12F675 (which Microchip actively recommends as the modern replacement) for new designs.

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PIC12C671T-10I/MF - 8-Bit 10MHz MCU 1.75KB OTP 8-DFN | Microchip
PIC12C671T-10I/MF

PIC12C671T-10I/MF - 8-Bit 10MHz MCU 1.75KB OTP 8-DFN | Microchip

The Microchip Technology PIC12C671T-10I/MF is a member of the PIC12C family of 8-bit CMOS microcontrollers with on-board A/D converter, offered in an 8-pin Dual Flat No-lead (8-DFN-S, 6x5 mm) surface-mount package and supplied in Tape & Reel. The device integrates 1.75 KB (1K x 14) of One-Time Programmable (OTP) program memory and 128 bytes of RAM, executes one instruction per cycle at up to 10 MHz oscillator frequency, and exposes 5 general-purpose digital I/O pins plus 4-channel 8-bit A/D conversion through the same pads. Industrial temperature grade (-40C to +85C), low power CMOS process, internal oscillator options, and an in-circuit serial programming interface round out the feature set. An 8-bit microcontroller (MCU) is a small, single-chip computer built around an 8-bit data path, typically used in embedded applications that demand deterministic behaviour, low cost, and modest code size. The PIC12C671T sits at the entry-level of Microchip's 8-bit portfolio: PIC -> 8-bit microcontroller -> PIC10/12/16 family -> PIC12C sub-family. It is one of the earliest 8-pin OTP devices and remains in production as a cost-optimized solution for simple control tasks where an external crystal is unnecessary. Key features that distinguish this device in its class include its 10 MHz instruction throughput (4 MHz oscillator x 4 PLLx), internal RC oscillator for low-BOM-count designs, 4-channel 8-bit ADC for direct sensor interfacing, and the wide 2.5 V to 5.5 V operating range that supports both 3.3 V and 5 V rails. Brown-out reset, watchdog timer, power-on reset, and code protection add robustness for unattended appliances, while the in-circuit serial programming (ICSP) interface permits firmware updates after PCB assembly. The PIC12C671T-10I/MF uses a 14-bit instruction word and a Harvard architecture with separate code and data paths, achieving predictable interrupt latency and compact code density that often translates to smaller OTP images than competing 8-bit cores. CMOS design with low-power Sleep mode and a typical 2 mA active current at 5 V keeps it suitable for line-powered or battery-assisted duty cycles. Typical applications for this part include small appliance controllers, sensor signal conditioning front-ends, automotive accessory modules, LED driver sequencers, and educational/development boards where the 8-pin footprint, internal oscillator, and minimal external component count simplify layout and reduce total BOM cost. Designers also use it as a housekeeping companion to a larger host MCU. When designing with this part, place a 0.1 uF decoupling capacitor as close as possible to VDD and provide adequate ground copper. The internal oscillator is trimmed at the factory but may need software fine-tuning per board to meet timing-sensitive serial protocols; for tight UART tolerances an external crystal is recommended. This page consolidates distributor pricing, pin-compatible drop-in alternatives, and practical design notes not found in the manufacturer datasheet, helping procurement and engineering teams evaluate supply risk and design trade-offs in a single view.

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