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PIC12C508AT-04I/SN - 8-bit OTP MCU, 768B, 4MHz, 8-SOIC | Microchip
PIC12C508AT-04I/SN

PIC12C508AT-04I/SN - 8-bit OTP MCU, 768B, 4MHz, 8-SOIC | Microchip

The Microchip Technology PIC12C508AT-04I/SN is a baseline PIC12 family 8-bit CMOS OTP-based microcontroller that delivers 1 microsecond instruction execution in an 8-pin SOIC package. It integrates a PIC RISC CPU core running at 4 MHz with 768 bytes (512 x 12) of OTP program memory, 25 bytes of RAM, and 6 I/O pins, all powered from a 3.0V to 5.5V supply. The "-04" suffix indicates 4 MHz maximum oscillator frequency, the "T" indicates tape and reel packaging, and the "I" denotes the industrial temperature grade of -40C to +85C. A PIC12C5xx-class microcontroller belongs to the 8-bit microcontroller family, which in turn sits within the broader category of microcontrollers (MCUs) and embedded controllers in semiconductor systems. These 8-bit MCUs are widely used in cost-sensitive, low-pin-count applications because they combine a compact footprint with deterministic RISC execution and a small, easy-to-learn instruction set. The PIC12C5xx uses only 33 single-word instructions and provides 2:1 code compression over typical 8-bit CISC competitors, allowing small OTP programs to deliver meaningful control functionality. Key features of the PIC12C508AT-04I/SN include the 4 MHz internal/external oscillator option, six general-purpose digital I/O pins, a power-on reset (POR) circuit, a watchdog timer (WDT) with on-chip RC oscillator, a programmable code protection mechanism, and an in-circuit serial programming (ICSP) interface. The device offers low power consumption with typical sleep current in the microamp range and supports operating voltages from 3.0V to 5.5V. The 12-bit wide instruction word and Harvard architecture allow single-cycle instruction fetch and execution. Architecturally, the PIC12C508A combines a RISC engine with separate program and data buses (Harvard architecture), enabling simultaneous instruction fetch and data access. The OTP program memory uses 12-bit-wide words, providing efficient encoding for the 33-instruction RISC set. On-chip peripherals include an 8-bit real-time timer/counter (TMR0), a watchdog timer with its own dedicated RC oscillator, and a power-on reset generator, eliminating many external components and reducing BOM cost. Typical applications include appliance control, automotive body electronics (after market), industrial control, intelligent instrumentation, remote transmitters, security systems, and small consumer products such as LED drivers, fan controllers, and battery chargers. The 8-pin footprint makes it suitable for space-constrained PCB designs where simple, deterministic logic replacement is required. When designing with this part, note that OTP memory is one-time programmable, so code must be fully verified before production programming. Decoupling capacitors (typically 0.1 uF ceramic) should be placed close to VDD, and unused I/O pins should be configured as outputs to minimize power consumption. For new designs, evaluate the PIC10F200/PIC10F202 or PIC12F508 flash-based equivalents, which support in-circuit reprogramming and may reduce development time. This page synthesizes distributor pricing, drop-in OTP and flash-replacement alternatives, and practical design notes not found in the manufacturer datasheet alone. Engineers can use the comparison table and design notes below to evaluate the PIC12C508AT-04I/SN against modern flash alternatives.

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PIC12C508T-04/SM - 8-Bit 4MHz OTP MCU 768B | Microchip
PIC12C508T-04/SM

PIC12C508T-04/SM - 8-Bit 4MHz OTP MCU 768B | Microchip

The Microchip PIC12C508T-04/SM is an 8-bit RISC microcontroller in the PIC12C5xx family, offering 4 MHz maximum operating frequency, 768 bytes of One-Time-Programmable (OTP) program memory (organized as 512 x 12-bit words), and 25 bytes of RAM in a compact 8-pin SOIJ surface-mount package. It is the tape-and-reel packaging variant of the PIC12C508-04/SM with identical silicon and electrical characteristics. An 8-bit microcontroller (MCU) is a single-chip computer that integrates an 8-bit CPU core, program memory (ROM/EPROM/Flash/OTP), data RAM, and peripheral interfaces such as I/O ports, timers, and sometimes comparators or ADCs. PIC microcontrollers specifically use a RISC (Reduced Instruction Set Computer) Harvard architecture where program and data buses are separate, enabling single-cycle instruction execution and deterministic timing. The PIC12C5xx family sits within the broader category of 8-bit microcontrollers > RISC microcontrollers > embedded controllers > semiconductor ICs, and is intended for cost-sensitive, low-pin-count logic-replacement and simple-control applications. Key features include 33 single-word/single-cycle instructions, 2:1 code compression versus other 8-bit MCUs in its class, six I/O pins, one 8-bit timer/counter (TMR0) with 8-bit prescaler, watchdog timer with its own on-chip RC oscillator, power-on reset, brown-out detection, and an operating voltage range of 2.5 V to 5.5 V. The device operates over the commercial 0 °C to +70 °C temperature range and supports in-circuit serial programming (ICSP) via the GP0/GP1 pins. Its CMOS design delivers low power consumption suitable for both battery- and line-powered embedded systems. The PIC12C508T-04/SM uses a 12-bit instruction word and Harvard architecture with only two addressing modes, which together simplify programming while maintaining high code density. Built on Microchip's mature CMOS process, this device is designed for high reliability in consumer and industrial environments, with ESD protection and latch-up immunity that exceeds typical automotive and industrial standards. The 8-SOIJ package provides a compact 3.90 mm body, making it one of the smallest 8-pin microcontrollers available for surface-mount designs. Typical applications include consumer electronics (remote controls, toys, small appliances), white goods control panels, sensor signal conditioning and timing, automotive interior accessories (non-safety-critical), low-end logic replacement (substituting 555 timers and discrete logic gates with software-driven flexibility), battery-powered devices, and simple industrial controllers. Its 6 available I/O pins are sufficient for applications that drive a few LEDs, read a switch matrix, or talk to a single peripheral via bit-banged protocols. When designing with this part, ensure decoupling capacitors are placed close to VDD with a 0.1 µF ceramic recommended. Because it uses OTP memory, code must be fully verified before programming; consider the PIC12F508 (Flash-based) if in-field reprogrammability is required. Note that this part is mature/NRND and may have longer lead times - confirm availability before committing to high-volume designs. This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC12C508T-04E/SM - 8-Bit 4MHz OTP MCU 768B | Microchip
PIC12C508T-04E/SM

PIC12C508T-04E/SM - 8-Bit 4MHz OTP MCU 768B | Microchip

The Microchip Technology PIC12C508T-04E/SM is an 8-bit, fully-static CMOS microcontroller in the PIC12C5xx family, housed in an 8-pin SOIJ surface-mount package. It integrates a 33-instruction RISC core running at 4 MHz, 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, and 25 bytes of data RAM, making it a compact, low-cost solution for simple embedded control tasks. What is an 8-bit OTP microcontroller? An 8-bit OTP MCU is a small single-chip computer that executes one instruction per clock cycle through a reduced-instruction-set core, where program memory is written once at production or in-circuit and cannot be electrically erased. The PIC12C5xx family sits in the hierarchy: 8-bit microcontroller -> RISC microcontroller -> embedded MCU -> semiconductor. It is designed for cost-sensitive, space-constrained applications where a full flash-based MCU would be overkill. Key features include a 4 MHz maximum operating frequency, 2.0 V to 5.5 V supply range, an integrated 8-bit timer/counter (TMR0) with 8-bit programmable prescaler, watchdog timer with its own on-chip RC oscillator, power-on reset (POR), device reset timer (DRT), and selectable 4 MHz or 37 kHz internal oscillator modes. The PIC12C508T-04E/SM operates across the extended -40°C to +125°C temperature range. The device uses a 12-bit instruction word architecture yielding a 2:1 code compression advantage over competing 8-bit MCUs, allowing more functional code in 768 bytes of OTP than most peers. With only 33 single-word/single-cycle instructions, the learning curve is short and interrupt latency is deterministic. Typical applications include consumer electronics remote controls, sensor interface front-ends, LED driver controllers, small appliance control boards, battery chargers, and low-end industrial control modules where minimal BOM and small footprint matter most. When designing with this part, note that the OTP memory cannot be reprogrammed in the field - choose the PIC12C508A flash-based variants or the PIC10F/12F series for development or in-field updates. The '04' speed suffix denotes the 4 MHz internal oscillator; the 'E' suffix denotes the extended temperature grade. This page synthesizes distributor pricing, verified drop-in alternatives, application context, and design considerations not aggregated in the manufacturer datasheet alone.

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PIC12C509-04/P - 8-Bit 4MHz OTP MCU 1.5KB | Microchip
PIC12C509-04/P

PIC12C509-04/P - 8-Bit 4MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC12C509-04/P is an 8-bit CMOS one-time-programmable (OTP) microcontroller from the baseline PIC12C family, packaged in a 8-pin PDIP through-hole format. It executes instructions in 200 ns at a 4 MHz clock rate and integrates 1.5 KB (1K x 12) of OTP program memory, 41 bytes of data RAM, and 6 general-purpose I/O pins on an 8-pin footprint. An 8-bit microcontroller is a single-chip computer that processes data in 8-bit-wide chunks using a Harvard or modified-Harvard architecture; in the Microchip taxonomy it sits under the PIC family, which is itself a sub-family of microcontrollers, embedded controllers, and ultimately standard ICs. OTP variants are programmed once by the user or contract manufacturer, in contrast to flash-based PICs that allow field re-programming, which makes them attractive for low-cost, high-volume, fixed-function applications. Key features include a RISC core with 33 single-cycle instructions, a programmable 4 MHz internal/external oscillator option, a watchdog timer with its own on-chip RC oscillator for reliable recovery, power-saving Sleep mode, and a wide operating voltage range of 2.5 V to 5.5 V. The 8-pin footprint gives 6 usable I/O lines plus VDD and VSS, with each I/O capable of sourcing up to 25 mA for direct LED drive. The device is qualified for the standard 0 °C to +70 °C commercial temperature range (the -04 speed grade and /P PDIP suffix) and is RoHS-compliant. Typical applications span low-cost consumer appliances, hobby/educational projects, simple sensor interfaces, and replacement of discrete logic. Designers should leave enough PCB area for the through-leads and apply decoupling capacitors within 5 mm of VDD/VSS; the MCLR pin must be tied high through a resistor for normal operation and pulled low only for in-circuit serial programming.

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PIC12C509-04/SM - 8-Bit 4MHz OTP MCU | Microchip | 8-SOIC
PIC12C509-04/SM

PIC12C509-04/SM - 8-Bit 4MHz OTP MCU | Microchip | 8-SOIC

The Microchip Technology PIC12C509-04/SM is an 8-bit CMOS OTP-based microcontroller operating at up to 4 MHz, integrating 1.5 KB (1K x 12) of One-Time-Programmable program memory, 41 bytes of RAM, and 6 general-purpose I/O pins in an 8-lead SOIJ (SOIC-8, 5.30 mm body width) surface-mount package. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, a compact instruction set, on-chip program memory, working RAM, and configurable I/O. The PIC12C509 belongs to Microchip's foundational PIC12C sub-family of 8-pin mid-range devices, occupying the hierarchy: microcontroller -> embedded MCU -> 8-bit MCU -> PIC12 family -> PIC12C5xx OTP series -> semiconductor. These devices are favored for legacy designs, cost-sensitive consumer products, and applications where Flash reprogrammability is not required. Key features include 25 mA source/sink capability per I/O pin (sufficient to drive small relays, LEDs, or power MOSFET gates directly), four selectable oscillator modes including a factory-calibrated internal 4 MHz RC oscillator, on-chip Power-on Reset (POR), and an instruction execution time of 1 microsecond at 4 MHz. The device is supported by a 33 single-word instruction set optimized for code density, and its 8-pin footprint enables compact PCB designs. The PIC12C509 uses a Harvard-architecture RISC core with separate program and data buses. The 12-bit-wide instruction word delivers a typical 2:1 code compression over competing 8-bit architectures, allowing more functionality in the constrained 1.5 KB OTP. The OTP memory is programmed once via Microchip's ICSP (In-Circuit Serial Programming) interface and is not erasable; for field-updatable designs, the PIC12F509 (Flash-based successor) is recommended. Typical applications include small appliance control (coffee makers, fans, remote-control toys), low-end sensor signal conditioning, simple LED drivers, and replacement of discrete logic glue in legacy industrial systems. The wide operating temperature range (commercial 0C to +70C) supports indoor commercial and light-industrial use. When designing with this device, ensure that the selected oscillator mode is compatible with the application timing budget. Because the program memory is OTP, firmware must be fully validated before committing to production programming. The internal 4 MHz RC oscillator is factory-calibrated, eliminating external crystal components in cost-sensitive designs. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes compiled from manufacturer datasheets and authorized distributor listings, providing information gain beyond what a single datasheet or catalog entry offers.

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PIC12C509-04E/P - 8-bit OTP MCU, 1.5KB, 4MHz, PDIP-8 | Microchip
PIC12C509-04E/P

PIC12C509-04E/P - 8-bit OTP MCU, 1.5KB, 4MHz, PDIP-8 | Microchip

The Microchip Technology PIC12C509-04E/P is a member of the PIC12C 8-bit CMOS microcontroller family, featuring a 12-bit instruction word, 1.5 KB of One-Time-Programmable (OTP) program memory, 41 bytes of RAM, and six general-purpose digital I/O pins operating from a 4 MHz internal RC oscillator (extended temperature grade) inside an 8-pin PDIP (0.300 inch / 7.62 mm pitch) through-hole package. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and peripheral interfaces onto one silicon die. Within the broader taxonomy, the PIC12C509 sits at the bottom of the 8-bit RISC microcontroller hierarchy: microcontroller -> 8-bit MCU -> RISC MCU -> PIC architecture -> Microchip PIC12 sub-family -> PIC12C509 part. PIC12C devices are widely used as glue logic, timers, low-cost controllers, and OTP-based fixed-function modules where flash reprogrammability is not required. Key specifications of the PIC12C509-04E/P include a 4 MHz maximum operating frequency, a 1 us instruction cycle time (4 MHz oscillator / 4), 1.5 KB OTP program memory organized as 1K x 12 words, 41 bytes of data RAM, six I/O pins with 25 mA source/sink drive capability per pin, four oscillator selections (including the factory-calibrated internal 4 MHz RC), and Power-on Reset (POR). The "E" suffix designates the extended temperature range of -40C to +125C, while the "04" indicates the 4 MHz speed grade. Architecturally, the PIC12C509 uses Microchip's classic PIC RISC core with a two-stage pipeline and a single accumulator (W register). It supports 33 single-word instructions, has eight special function registers mapped into a small data RAM bank, and features a 5-bit GPIO port shared with the internal oscillator and MCLR functions. A watchdog timer with its own on-chip RC oscillator is optional for safety-critical applications. Typical applications include low-cost appliance control, sensor interface modules, battery chargers, LED controllers, and replacement of discrete logic in space-constrained designs. The extended temperature range allows use in automotive underhood environments and outdoor industrial equipment. Because the part is OTP rather than Flash, it is best suited to high-volume production where firmware is final and stable, rather than iterative prototyping. When designing with this device, allocate sufficient decoupling (a 0.1 uF ceramic on VDD close to the pin) and reserve the MCLR/VPP pin for in-circuit programming or tie it to VDD through a 10 kohm resistor for normal operation. Note that the PIC12C509 series has been succeeded by Flash-based PIC10F/PIC12F families for new designs; choose PIC12C509-04E/P only when matching an existing OTP BOM. This page synthesizes distributor stock data, drop-in alternatives from the PIC12C509 family, and practical design notes not found in the bare datasheet. All pricing reflects market conditions as of 2026-09-14.

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PIC12C509-04E/SM - 8-bit MCU 1.5KB OTP 4MHz SOIJ-8 | Microchip
PIC12C509-04E/SM

PIC12C509-04E/SM - 8-bit MCU 1.5KB OTP 4MHz SOIJ-8 | Microchip

The Microchip Technology PIC12C509-04E/SM is an 8-bit PIC12-series RISC microcontroller with 1.5 KB (1K x 12) One-Time-Programmable (OTP) program memory, 41 bytes of RAM, and 6 I/O pins, running at 4 MHz from a 2.5 V to 5.5 V supply in an 8-pin SOIJ (SM) surface-mount package. The "-04E" suffix indicates a 4 MHz internal oscillator speed grade and the "E" extended temperature range of -40 °C to +125 °C, while the "/SM" suffix denotes the SOIJ-8 (5.30 mm body) tube-packaged variant. An 8-bit microcontroller (MCU) is a single-chip computer integrating a CPU, non-volatile program memory, RAM, and peripherals (timers, I/O, watchdog, reset) optimized for embedded control tasks. PIC12-series microcontrollers sit at the low end of Microchip's 8-bit PIC® family hierarchy: PIC12 -> PIC10/12/16/18 -> 8-bit PIC -> 8-bit microcontroller -> embedded MCU. They are valued for low cost, small footprint, and ease of use in cost-sensitive applications such as appliance control, sensor signal conditioning, and simple glue logic replacement. Key features of the PIC12C509-04E/SM include a Harvard RISC architecture with 33 single-word instructions and a 12-bit instruction word, an internal 4 MHz RC oscillator (no external crystal required), one 8-bit timer (TMR0) plus a Watchdog Timer (WDT), Power-On Reset (POR), 6 general-purpose digital I/O pins (5 true I/O plus 1 input-only), and brown-out-free low-power operation. The OTP program memory enables one-time factory or in-circuit programming, lowering unit cost relative to Flash-based MCUs. Typical applications include low-cost consumer appliance controllers (rice cookers, coffee machines, fans), sensor interfaces, LED driving, battery-powered timer circuits, and replacement of discrete logic or 555 timers. The wide 2.5 V to 5.5 V supply range allows direct operation from 3.3 V or 5 V rails without level shifting. The extended -40 °C to +125 °C temperature grade also makes this part usable in industrial environments. When designing with the PIC12C509-04E/SM, note that OTP memory cannot be re-programmed; for development, Microchip recommends the PIC12F509 Flash equivalent in the same 8-pin footprint. Decoupling VDD with a 100 nF ceramic capacitor placed within 5 mm of the pin is essential. Reset is internal - no external MCLR pull-up is required when using the internal POR. This page synthesizes distributor pricing, drop-in OTP and Flash alternatives, and practical design notes not found in the bare manufacturer datasheet. Compare before committing to the OTP-only variant for production volumes.

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PIC12C509-04I/SM - 8-Bit 4MHz OTP MCU, 1.5KB | Microchip
PIC12C509-04I/SM

PIC12C509-04I/SM - 8-Bit 4MHz OTP MCU, 1.5KB | Microchip

The Microchip Technology PIC12C509-04I/SM is an 8-bit CMOS RISC microcontroller featuring 1.5KB (1K x 12) of One-Time Programmable (OTP) program memory, 41 bytes of RAM, and 6 I/O pins, housed in an 8-pin SOIJ (SM) package rated for industrial temperature operation (-40C to +85C). An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, integrating a CPU core, program memory, data RAM, and peripherals. The PIC12C509 belongs to Microchip's baseline PIC10/12/16 family of OTP-based microcontrollers, which sit at the simplest end of the PIC architecture hierarchy: microcontroller -> embedded controller -> microprocessor -> semiconductor. Baseline PIC12 devices execute one instruction per 1us at 4 MHz and provide a minimal footprint solution for cost-sensitive, low-pin-count applications. The PIC12C509-04I/SM operates at a clock frequency of up to 4 MHz with an instruction execution time of 1 microsecond, using a RISC instruction set of only 33 single-word instructions. It features a 12-bit program counter capable of addressing 1K x 12 of OTP, on-chip RC oscillator, and 6 general-purpose digital I/O pins. The OTP memory allows one-time field programming, lowering unit cost versus flash-based parts. Internally, the device uses a Harvard architecture with separate program and data buses, a precision 4 MHz internal RC oscillator (no external crystal required), and a watchdog timer with on-chip RC oscillator for reliable unattended operation. Power consumption is approximately 2 mA typical at 5V/4 MHz and falls to microampere levels in SLEEP mode, making the part practical for battery-powered sensor and appliance designs. Typical applications include simple timing and pulse generation, household appliance control (toasters, fans, coffee makers), battery chargers, LED drivers, security sensors, and any low-cost 6-I/O embedded task. The industrial temperature grade (-40C to +85C, suffix "I") broadens deployment into factory and outdoor enclosures. When designing with the PIC12C509-04I/SM, note that OTP cannot be erased, so firmware must be fully verified before programming. For new designs or those requiring in-system reprogrammability, the pin-compatible PIC12F509 (Flash, 1.5KB) is typically preferred. For designs needing >1.5KB of code, consider PIC12C508A (512 words) or PIC16C5xx family with more I/O and memory. This page consolidates distributor pricing, same-package drop-in alternatives, and practical design guidance drawn from the Microchip PIC12C509 datasheet family. Information not present in the verified datasheet is marked as [DATA_NEEDED] for engineering review.

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PIC12C509/JW - 8-Bit 4MHz EPROM MCU, 1.5KB | Microchip
PIC12C509/JW

PIC12C509/JW - 8-Bit 4MHz EPROM MCU, 1.5KB | Microchip

The Microchip Technology PIC12C509/JW is an 8-bit PIC RISC microcontroller with 1.5KB (1K x 12) of UV-erasable EPROM program memory, 41 bytes of RAM, and a maximum CPU clock of 4 MHz, housed in an 8-pin windowed Ceramic DIP (CDIP-8) package. The /JW suffix denotes the erasable windowed ceramic package, intended for prototyping and field re-programmability, and the part operates from a 2.5V to 5.5V supply. A PIC microcontroller is a compact 8-bit RISC-based CMOS MCU built around a Harvard architecture with separate program and data buses. The PIC12C5xx family that PIC12C509/JW belongs to is the lowest pin-count and lowest cost tier of the classic PIC12 line, designed for glue logic replacement, simple state machines, and space-constrained embedded control. The 12-bit instruction width keeps the core simple, while the reduced instruction set (33 single-word, single-cycle instructions) makes timing predictable for interrupt-driven and polled firmware designs. Key features of the PIC12C509/JW include 5 general-purpose I/O pins (25 mA source/sink per pin), an 8-bit real-time clock/counter (TMR0) with an 8-bit programmable prescaler, a Watchdog Timer (WDT) with its own on-chip RC oscillator, a Power-on Reset (POR), a Device Reset Timer (DRT), and four selectable oscillator modes including the internal 4 MHz RC oscillator with programmable calibration. The part is fully static and supports a DC to 4 MHz operating range across the commercial temperature grade (0C to +70C). The architecture is RISC with 33 single-word/single-cycle instructions, 2-level hardware stack, and direct/indirect addressing modes. EPROM-based program memory with 1,000,000 erase/write endurance makes the JW variant ideal for development. Programmable code protection is supported, and the device can be erased by exposing the quartz window to UV light, then re-programmed on standard EPROM programmers - this is the key reason /JW parts remain in service for engineering prototypes and small production runs. Typical applications for the PIC12C509/JW include personal care appliances, simple IR remote control transmitters, low-end consumer toys, automotive body electronics sub-modules, battery chargers, and any embedded design that benefits from a sub-$1 8-pin MCU. It also functions as a programmable logic replacement, timer sequencer, or PWM controller. The windowed CDIP-8 package is intentionally chosen for prototype re-programmability rather than high-volume SMT manufacturing. When designing with this part, note that JW ceramic parts are NOT recommended for new high-volume designs - Microchip recommends the OTP PIC12C509A in PDIP/SOIC or migrating to the PIC10F/12F Flash families. The /JW is reserved for development, evaluation, and legacy support. Always verify the oscillator selection bit setting (RC vs XT vs LP vs HS) and place a 0.1uF decoupling capacitor close to VDD. This page synthesizes distributor pricing, drop-in compatible alternatives, and practical design notes not found in the standalone manufacturer datasheet, giving engineers a single source for lifecycle status, comparison data, and procurement guidance.

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

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

The Microchip Technology PIC12C509A-04/SM is an 8-bit CMOS OTP-based PIC microcontroller housed in an 8-pin SOIJ package, featuring a 4 MHz maximum clock frequency, 1.5 KB (1K x 12) of one-time programmable program memory, 41 bytes of data RAM, and 6 I/O pins. The -04 speed suffix denotes a 4 MHz oscillator, while the /SM suffix denotes the SOIJ-8 surface-mount package. According to the Microchip PIC12C509A datasheet, the part executes instructions in a single 1 us cycle (RISC architecture with only 33 single-word instructions), enabling compact code density and fast interrupt response. A PIC microcontroller (Programmable Interrupt Controller) is a family of 8-bit RISC microcontrollers built around a Harvard architecture with separate program and data buses. The PIC12C family represents the lowest pin-count segment of the PIC family (8 pins) and is widely used as a 'glue logic' replacement, intelligent sensor interface, or simple state controller where space and cost dominate the design budget. The PIC12C509A uses CMOS process technology and is fully static, allowing the clock to be stopped without losing register state. Key features of the PIC12C509A-04/SM include a watchdog timer with on-chip RC oscillator for reliable operation, power-on reset, power-saving SLEEP mode, and a precision 4 MHz internal RC oscillator option. The device operates over the standard commercial 0C to +70C range (no /I industrial or /E extended temp suffix on this MPN). With 1024 words of OTP program memory and 41 bytes of RAM, it targets small, low-cost, code-volume applications such as sensor signal conditioning, LED blink controllers, and appliance user-interface logic. Architecturally, the PIC12C509A uses a 12-bit instruction word and an 8-bit data path, with two I/O ports (GPIO, GP1-GP5) that share pins with the device's internal functions such as the T0CKI timer input, the MCLR reset, and the GP3 general-purpose pin. The oscillator can be selected from an external RC, external crystal/ceramic resonator, or the internal 4 MHz RC, simplifying BOM cost. Code protection is supported via a configuration bit to lock OTP contents. Typical applications for the PIC12C509A-04/SM include simple sensor interfaces (e.g., thermistor or thermopile readout), battery-powered LED drivers, low-end appliance controls (rice cookers, fans, coffee makers), and consumer accessories (toys, IR remote transmitters, personal care devices). It is commonly paired with an EEPROM such as 24LC02 for non-volatile parameter storage, and a low-cost op-amp for analog signal conditioning. When designing with this device, select a programmer/debugger compatible with OTP PIC12C parts (e.g., PICSTART Plus, MPLAB ICD 2/3, or PICkit 3). Because OTP memory cannot be erased, choose the PIC12C509A-04/SM only when the firmware is final; for development use the PIC12F509 flash-based pin-compatible alternative. Ensure decoupling capacitors of 0.1 uF are placed close to VDD and that unused I/O pins are configured as outputs or inputs with weak pull-up. This page synthesizes distributor pricing, drop-in SOIJ-8 alternatives, comparison tables, and practical design notes not found on the manufacturer product page alone.

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PIC12C509A-04/SN - 8-Bit 4MHz OTP MCU 1.5KB | Microchip
PIC12C509A-04/SN

PIC12C509A-04/SN - 8-Bit 4MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC12C509A-04/SN is an 8-bit CMOS RISC microcontroller in the PIC12C family, featuring 1.5KB (1K x 12) of One-Time Programmable (OTP) program memory, 41 bytes of data RAM, and a 4MHz internal oscillator in an 8-pin SOIC (SN) package. It executes instructions in a single 1us cycle and offers 33 single-word instructions, making it suitable for compact embedded applications where board space and simplicity are paramount. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripheral interfaces into one IC. The PIC12C5xx family is one of the smallest 8-bit microcontrollers Microchip produces, packaging the full PIC architecture into an 8-pin footprint. It belongs to the broader category of embedded microcontrollers -> 8-bit microcontrollers -> CMOS RISC microcontrollers -> PIC microcontrollers -> semiconductors. Key features of the PIC12C509A-04/SN include six general-purpose I/O lines, two timers, a Watchdog Timer (WDT) for reliable operation, a Power-on Reset (POR) circuit, and an internal 4MHz oscillator. The device operates across a 2.5V to 5.5V supply range (typical 3.3V/5V operation) and is rated for the commercial 0C to +70C temperature range (the -04 speed grade denotes 4MHz). OTP memory is factory-programmable and ideal for low-to-medium volume production runs. The PIC12C509A uses a Harvard architecture with a 12-bit program word and an 8-bit data path, allowing predictable single-cycle instruction execution. Its compact register file contains 7 special function registers and 25 general purpose registers plus 16 addressable via banking. The 8-pin SOIC (SN) package supports surface-mount assembly on 1.27mm pitch pads. Typical applications include automotive subsystems, industrial appliance control, consumer electronics entry-level products, sensor interface front-ends, and low-cost timing/replacement logic. Six I/O pins are sufficient for simple state machines, LED drivers, and signal conditioning. Industrial designers often use the PIC12C509A for cost-sensitive and space-constrained glue logic replacement. When designing, note that the OTP memory requires a device programmer (e.g., PICkit) and cannot be re-programmed in-circuit. For prototype or field-updatable designs, consider the Flash-based PIC12F509 alternative, which is pin-compatible with most PIC12C509A designs. The 8-SOIC package requires 1.27mm pitch land pattern and a clean analog supply if used with ADC. This page synthesizes distributor pricing, drop-in PIC12C509A family alternatives, and practical design notes not consolidated on the manufacturer datasheet.

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PIC12C509A-04E/P - 8-Bit 4MHz OTP MCU 1.5KB | Microchip
PIC12C509A-04E/P

PIC12C509A-04E/P - 8-Bit 4MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC12C509A-04E/P is an 8-bit CMOS OTP-based microcontroller in a 8-pin PDIP package, built on the PIC12C5XX family architecture. It integrates a 1.5KB (1K x 12) one-time programmable program memory, 41 bytes of RAM, a hardware 8-bit timer/counter (TMR0) with 8-bit programmable prescaler, and a watchdog timer (WDT) with its own dedicated on-chip RC oscillator, all in a compact 8-pin footprint. The "-04E" suffix denotes the 4 MHz operating speed grade and the extended (-40C to +125C) industrial temperature range. A microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral interfaces onto one IC. The 8-bit PIC MCU family from Microchip uses a RISC (Reduced Instruction Set Computer) architecture with only 33 single-word single-cycle instructions, so most instructions execute in 1 us at 4 MHz. Within the broader taxonomy, the PIC12C509A belongs to the 8-bit PIC microcontrollers category, which sits under the wider umbrella of microcontrollers, embedded processors, and ultimately semiconductor integrated circuits. Key features of this device include six general-purpose digital I/O pins with 25 mA source/sink drive capability, selectable oscillator modes (internal 4 MHz RC, external RC, external crystal, or low-cost RC), Power-On Reset (POR), Device Reset Timer (DRT), in-circuit serial programming (ICSP) support, and programmable code protection. The OTP program memory is one-time programmable yet retains field-reprogrammability through the ICSP interface during development, simplifying firmware iteration. The PIC12C509A's RISC core executes instructions in a single cycle (1 us at 4 MHz) except for program branches (two cycles), and its Harvard architecture with separate program and data buses lets the CPU fetch the next instruction while executing the current one. The integrated 4 MHz internal RC oscillator with programmable calibration removes the need for external crystals in cost-sensitive designs, while external oscillator options support timing-critical or low-EMI applications. Typical applications include automotive body and chassis subsystems, industrial sensor interfaces and small appliance controllers, low-end consumer electronics, and remote control transmitters. The wide 3.0V to 5.5V operating range and extended temperature grade make it well-suited to harsh-environment 8-bit embedded designs where cost and pin count dominate over raw computational horsepower. When designing with the PIC12C509A-04E/P, the main trade-off is OTP memory: once locked, the program cannot be changed. Designers should plan for ICSP header access and consider whether an EPROM- or Flash-based cousin (PIC12F509, PIC10F202) is more appropriate for firmware that will be revised in the field. The 6 I/O pins also limit peripheral count, often requiring I/O expansion via shift registers or I2C port expanders. This page synthesizes distributor pricing, drop-in alternatives within the PIC12C family, and practical design notes not found in the manufacturer datasheet alone, providing a single reference for BOM selection, lifecycle planning, and cross-vendor risk mitigation.

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

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

The Microchip Technology PIC12C509A-04E/SM is an 8-bit CMOS RISC microcontroller with 1.5KB (1K x 12) of One-Time-Programmable (OTP) program memory and 41 bytes of data RAM, housed in an 8-pin SOIJ (SM) package with extended operating temperature range. It executes one instruction per 1 microsecond at a maximum 4MHz clock rate from only 33 single-word instructions, packing the PIC 12C baseline architecture into a tiny 8-pin footprint with 6 general-purpose I/O pins. An 8-bit microcontroller (MCU) is a small computer-on-a-chip integrating an 8-bit CPU, program memory (ROM/Flash/OTP), data RAM, I/O peripherals, and timers on a single die. The PIC12C509A belongs to the baseline PIC12C family, which targets cost-sensitive, space-constrained embedded applications. Within the broader taxonomy it sits as: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor device. Its RISC Harvard architecture separates program and data buses for predictable single-cycle instruction execution, while CMOS process technology minimizes quiescent current for battery-powered designs. Key features include an 8-bit real-time clock/counter (TMR0) with programmable prescaler, internal 4MHz RC oscillator (and external oscillator option), Power-On Reset (POR), Device Reset Timer (DRT), Watchdog Timer (WDT) with its own dedicated on-chip RC oscillator for reliable operation, and programmable code protection. It supports 1,000,000 erase/write cycles on internal EEPROM emulation cells and operates over 2.5V to 5.5V across the extended -40C to +125C industrial temperature range. The architecture uses a 12-bit instruction word with 8-bit data path and a two-stage pipeline, achieving deterministic interrupt latency. The OTP program memory is factory-or-user-programmable using Microchip's development tools, while internal EEPROM emulation provides 16 bytes of non-volatile data storage. The WDT's independent RC oscillator ensures reliable system recovery even when the main clock fails - critical for unattended industrial and appliance installations. Typical applications include automotive subsystems (interior lighting, sensor interfaces), industrial control (small appliance controllers, fan drivers, low-end sensor signal conditioning), consumer electronics (remote controls, toys, LED drivers), and IoT edge nodes. The 6 I/O pins support direct LED drive, button input scanning, and serial bit-banged protocols (UART/IR) without external peripherals. When designing with this device, note that OTP memory cannot be re-programmed - use PIC12F509 (Flash) for prototypes or PIC12C509A for production. The 8-pin SOIJ package is more compact than standard SOIC but requires reflow-compatible land patterns. Ensure the WDT is enabled via configuration bits for unattended applications. This page synthesizes distributor pricing, drop-in package equivalents, and practical design considerations not found in the standalone manufacturer datasheet, accelerating BOM selection for cost-sensitive 8-bit MCU designs.

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

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

The Microchip Technology PIC12C509A-04I/MF is a low-cost, high-performance 8-bit CMOS microcontroller built on Microchip's RISC PIC architecture, delivered in an 8-pin DFN-S (6x5 mm) package. It integrates 1.5KB (1K x 12) of One-Time Programmable (OTP) program memory, 41 bytes of RAM, and 5 general-purpose I/O pins, executing instructions at 4 MHz with 1 microsecond per instruction cycle. The device operates from 2.5V to 5.5V across the industrial -40C to +85C temperature range. An 8-bit microcontroller (MCU) is a small computer-on-a-chip integrating a CPU, memory (ROM/Flash/OTP and RAM), I/O peripherals, and timers on a single die. The PIC12C5XX family belongs to the baseline PIC12C microcontrollers, sitting in Microchip's hierarchy of 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. These parts target cost-sensitive, space-constrained embedded control applications where simple RISC instruction sets and ultra-low pin counts outweigh the need for large memories. Key features include 33 single-word/single-cycle instructions, an 8-bit real-time clock/counter (TMR0) with programmable prescaler, Power-On Reset (POR), Device Reset Timer (DRT), Watchdog Timer (WDT) with its own on-chip RC oscillator, and programmable code protection. The internal 4 MHz RC oscillator eliminates external clock components, reducing BOM cost. The 8-bit instruction word and 12-bit opcode architecture provide deterministic execution for real-time control loops. Typical applications include automotive body electronics, industrial control, appliance control, sensor signal conditioning, and low-end consumer devices. With only 5 I/O pins available after accounting for VDD/VSS and reset, the part is best suited to simple state machines, timing-based controllers, and glue-logic replacement. The DFN-S 6x5 mm surface-mount package suits reflow assembly on compact PCBs, and the 04 MHz speed grade balances instruction throughput against power consumption in always-on applications. When designing with this device, ensure the MCLR pin is properly handled (it can be left open in many cases due to internal weak pull-up), and that the WDT is either enabled in software or disabled via configuration bits. The OTP memory means firmware must be fully validated before programming; use the PIC12C509A JW UV-erasable windowed version for prototype development. Five I/O pins (GP0-GP4 with GP3 only available as input) must be allocated carefully between user I/O and the optional oscillator/reset functions. This page synthesizes distributor pricing, drop-in same-package alternatives, comparison data, and practical design notes for the PIC12C509A-04I/MF that are not consolidated on any single manufacturer or distributor page, helping engineers evaluate replacements and design trade-offs in one place.

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

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

The Microchip PIC12C509A-04I/P is a 4 MHz 8-bit CMOS OTP (One-Time-Programmable) microcontroller in an 8-pin PDIP package with 1.5 KB (1K x 12) program memory, 41 bytes of RAM, and 6 I/O pins, designed around Microchip's enhanced PIC16C5X RISC core. It executes instructions in a single 1 microsecond instruction cycle and ships with only 33 single-word instructions, which makes it one of the easiest microcontrollers to learn and deploy in cost-sensitive designs. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and programmable I/O on one die. Within the broader product taxonomy, an 8-bit RISC MCU is a sub-category of microcontrollers -> microcontrollers (Integrated Circuits) -> semiconductors. The PIC12C5XX family, including PIC12C508, PIC12C509, PIC12C509A, PIC12CR509A, and PIC12CE519, is the compact 8-pin cousin of the classic PIC16C5X architecture and is well known for fitting control logic into a DIP-8 footprint. Key features of the PIC12C509A-04I/P include 4 MHz maximum oscillator frequency (the "/04" suffix), an industrial-grade operating temperature range of -40C to +85C (the "I" suffix), 6 bidirectional I/O pins multiplexed with the device's peripherals, an 8-bit timer/counter (TMR0) with an 8-bit programmable prescaler, a watchdog timer with its own on-chip RC oscillator for reliable resets, and a power-on reset circuit. It is built on CMOS EPROM/OTP technology and operates from 2.5V to 5.5V VDD, drawing only microampere-level sleep current. From an architectural perspective, the PIC12C509A uses a Harvard RISC architecture with separate program and data paths, a 12-bit-wide program word, and a two-level hardware stack. The PIC12C509A revision adds improvements in oscillator tolerance, DC RAM, and reset behavior versus the original PIC12C509, which is why datasheet users normally select the 'A' silicon for new designs. Program memory is OTP, so firmware is committed during device programming and is not field-rewriteable - choose PIC12CR509A or PIC12F509 if in-system reprogrammability is required. Typical applications for the PIC12C509A-04I/P include appliance and white-goods controllers, automotive body and interior electronics (non-safety), small sensor signal processing and conditioning, smart battery chargers and low-cost power management controllers, and consumer remote controls. The industrial temperature grade makes it appropriate for outdoor controllers, building automation, and harsh industrial environments. When designing with this device, observe the 4 MHz maximum clock, ensure that the MCLR pin is properly tied through the recommended RC reset network or pulled high, and respect the 25 mA per-pin / 150 mA per-port sink limits. Because the program memory is OTP, a device programmer (e.g., PICkit or MPLAB ICD) must be used during prototype bring-up before committing to masked/OTP silicon. This page synthesizes drop-in same-package alternatives, distributor pricing as of 2026-10-09, and practical design considerations that go beyond what is in the manufacturer datasheet.

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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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