Circuitos integrados

PIC12C508A-04/P

PIC12C508A-04/P - 8-bit 4MHz OTP MCU 768B | Microchip | DIP-8

The Microchip Technology PIC12C508A-04/P is an 8-bit CMOS RISC microcontroller in a 8-pin PDIP package, featuring 4MHz maximum oscillator frequency, 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory, and 25 bytes of RAM, engineered for cost-sensitive embedded applications. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, data memory, and integrated peripherals. The PIC12C508A belongs to the 8-bit microcontroller category, which uses an 8-bit data path. Within the broader hierarchy, it sits as: PIC12C508A -> PIC12C5xx family -> PIC architecture -> 8-bit MCU -> microcontroller -> embedded computing IC. This MCU variant uses CMOS process technology with EPROM/OTP-based program storage, distinguishing it from Flash-based 8-bit MCUs that allow multiple reprogram cycles. Key features include 33 single-word/single-cycle instructions, 1 microsecond instruction execution time at 4MHz, 6 general-purpose I/O pins, a hardware 8-bit timer (TMR0) with 8-bit programmable prescaler, watchdog timer with on-chip RC oscillator, power-on reset, and in-circuit serial programming (ICSP) capability. The device also offers 4 oscillator options: RC, LP, XT, and HS, providing flexibility across low-power and high-speed applications. Power consumption is typically under 2 mA active at 5V/4MHz and below 1 microamp in sleep mode. The PIC12C508A-04/P employs a Harvard RISC architecture with separate program and data buses, and 12-bit wide instructions yielding 2:1 code compression over comparable 8-bit CISC controllers. The -04 speed suffix designates 4MHz operation, and the /P suffix indicates a PDIP-8 (300 mil) through-hole package. Operating voltage spans 2.5V to 5.5V across commercial and industrial temperature ranges (0C to +70C for commercial, -40C to +85C for industrial). The OTP nature of program memory means firmware is programmed once via Microchip's MPLAB ecosystem and cannot be field-updated. Typical applications include appliance control modules, LED driver controllers, simple sensor interfaces, low-end consumer electronics, and battery-powered devices. Its small 8-pin footprint and 33-instruction RISC core suit designs where PCB real estate is constrained and code volume is below 768 bytes. The device is widely deployed in cost-sensitive mass-production units. Design consideration: Because the program memory is OTP, a burned device cannot be reprogrammed, so engineers should always verify code with a development-friendly equivalent (such as the PIC12F508 with Flash memory) before committing to OTP volume production. The /P 8-pin PDIP variant is also ideal for through-hole prototyping and hobby projects. This page consolidates distributor pricing, pin-compatible drop-in alternatives, and practical design considerations that go beyond the manufacturer datasheet summary.

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PIC12C508A-04/SM

PIC12C508A-04/SM - 8-Bit 4MHz OTP MCU, 8-SOIJ | Microchip

The Microchip Technology PIC12C508A-04/SM is an 8-bit, RISC-based CMOS microcontroller from the PIC12C5xx family, packaged in an 8-lead Small Outline IC (SOIJ) form factor. It executes instructions in a single 1 us cycle (4 MHz oscillator) and integrates 768 bytes of One-Time-Programmable (OTP) program memory (512 x 12 words), 25 bytes of general-purpose RAM, and six general-purpose I/O pins within an extremely compact 8-pin footprint. Operating from 3.0 V to 5.5 V across the commercial 0 C to +70 C range, the PIC12C508A is one of the smallest OTP microcontrollers Microchip has ever offered. What is an 8-bit OTP microcontroller? An 8-bit microcontroller is a single-chip computer that processes data in 8-bit chunks and is the workhorse of cost-sensitive embedded control. OTP (One-Time-Programmable) memory can be written exactly once, which lowers die cost versus Flash and suits high-volume, fixed-function products. Within the hierarchy: microcontroller -> embedded controller -> semiconductor, the PIC12C5xx family sits at the small-footprint, low-pin-count tier aimed at replacing discrete logic and small electromechanical timers. Key differentiating features include: (1) only 33 single-word, single-cycle instructions, enabling extremely compact code; (2) 8-bit timer/counter (TMR0) with 8-bit prescaler; (3) internal 4 MHz RC oscillator option eliminating the external crystal in many designs; (4) watchdog timer with on-chip RC oscillator for reliable reset behavior; and (5) in-circuit serial programming (ICSP) capability even on the 8-pin package. Each instruction executes in 1 microsecond at 4 MHz, yielding roughly 1 MIPS performance. Architecturally, the PIC12C508A uses a Harvard-style RISC core with separate program and data buses, an 8-level deep hardware stack, and a 2-level instruction pipeline. This is sufficient for state machines, simple sensor conditioning, and logic-replacement tasks, but it is not designed for USB, Ethernet, or display interfaces. The CMOS process gives very low power consumption (typically < 2 mA active, < 1 uA standby), enabling battery-friendly designs. Typical applications include appliance timers, fan/HVAC controls, security-system keypads, IR remote-control transmitters, battery chargers for low-end consumer goods, automotive body controllers (when paired with the I-grade variant), and small consumer toys. The wide operating voltage range makes it suitable for both 3.3 V and 5 V rails, and the SOIJ package is friendly to wave-solder and reflow profiles. When designing in this part, pay attention to the OTP-only nature: code must be 100 percent verified before programming, since there is no way to re-flash a defective unit. Always budget the GP3/MCLR shared-pin behaviour and ensure adequate decoupling on VDD (0.1 uF) close to the package. OTP programming reduces unit cost versus Flash in volume production, but increases development risk for prototypes. This page synthesizes distributor stock levels, drop-in same-package alternatives from the PIC12C5xx/12F5xx family, and practical PCB design notes that go beyond the information found in the standalone manufacturer datasheet.

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PIC12C508A-04E/P

PIC12C508A-04E/P - 8-bit 4MHz OTP MCU, 8-PDIP, Extended Temp | Microchip

The Microchip Technology PIC12C508A-04E/P is an 8-bit CMOS OTP-based PIC microcontroller delivering 4 MHz instruction execution from 33 single-word RISC instructions in an 8-pin PDIP through-hole package. It integrates 768 bytes (512 x 12) of OTP program memory, 25 bytes of RAM, and 6 general-purpose I/O pins, with a 4 MHz internal/external clock domain suited for compact logic-replacement designs. An 8-bit microcontroller (MCU) is a single-chip computer containing a CPU, program memory (ROM/OTP/Flash), data RAM, and peripheral set. Within the broader hierarchy, the PIC12C508A belongs to the PIC12C5xx family of 8-bit microcontrollers -> the Microchip PIC microcontroller family -> the 8-bit MCU class -> the microcontroller category -> the embedded processing semiconductor class. The 'C' suffix denotes CMOS OTP process, the 'A' marks a die-revision upgrade, the '04' specifies the 4 MHz speed grade, 'E' marks the extended temperature range (-40C to +125C), and '/P' indicates the PDIP-8 package. Key features include a 1 microsecond instruction cycle (4 MHz oscillator divided by 4), an 8-bit timer/counter (TMR0) with 8-bit programmable prescaler, Power-On Reset (POR), Device Reset Timer (DRT), and a Watchdog Timer (WDT) with its own on-chip RC oscillator for reliable operation without external components. Programmable code protection is supported and 1,000,000 erase/write cycles endurance is rated. Architecturally, the PIC12C508A employs a RISC Harvard architecture with separate program and data paths, enabling single-cycle instruction execution except for branches. The CMOS OTP process delivers low static power consumption, and the in-circuit serial programming (ICSP) interface enables firmware updates via two pins, simplifying prototyping. Typical applications include logic replacement (replacing discrete 555/4017 circuits with one chip), appliance controllers, white-goods user interfaces, low-end automotive body electronics, remote-control transmitters, sensor signal conditioning, simple PWM/sequence generators, and battery-powered devices where the 8-pin footprint and low pin count fit the application. When designing with this device, note that OTP is one-time-programmable: firmware must be fully verified before burn. For extended temperature operation ensure the 'E' suffix part is specified; the standard '04/P' variant operates only 0C to +70C. The 6 I/O pins share package pins with VDD/VSS/GP3-only, so multi-function pin assignment requires careful review against the pinout. This page synthesizes verified distributor pricing, pin-compatible drop-in alternatives, and practical design considerations not consolidated on any single datasheet.

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PIC12C508A-04I/P

PIC12C508A-04I/P - 8-bit 4MHz OTP MCU 768B | Microchip

The Microchip Technology PIC12C508A-04I/P is an 8-bit CMOS microcontroller based on Microchip's Enhanced PIC16C5X RISC core, packaged in an 8-pin PDIP through-hole package. The device integrates 768 bytes (512 x 12 words) of One-Time-Programmable (OTP) program memory, 25 bytes of RAM, and 6 general-purpose I/O pins, executing instructions at a 1 microsecond per instruction cycle when clocked at 4 MHz. Operating voltage spans 2.5V to 5.5V, making it compatible with both 3.3V and 5V rails commonly found in industrial and appliance designs. What is a PIC12C5XX microcontroller? The PIC12C5XX family from Microchip Technology represents a class of low-cost, high-performance 8-bit fully-static CMOS microcontrollers built on a RISC architecture with only 33 single-word single-cycle instructions. Within the taxonomy, PIC microcontrollers belong to the broader category of microcontrollers (MCUs) -> embedded controllers -> semiconductor ICs. This minimalist instruction set, combined with a Harvard memory architecture, gives the PIC12C508A deterministic interrupt latency and predictable timing - qualities valued in automotive, appliance, and consumer products where code simplicity is paramount. Key features of the PIC12C508A-04I/P include an internal 4 MHz RC oscillator (with the -04 speed designation), an on-chip power-on reset, a watchdog timer with its own on-chip RC oscillator for reliable operation without external components, and code protection to prevent unauthorized memory reads. The 8-pin PDIP form factor is the most user-friendly package for prototyping and low-volume production, accepting standard DIP sockets and breadboards. Technically, the device uses a 12-bit instruction word that is byte-addressable through a 7+2 special function register + 25 general purpose register file. Power consumption is rated in the microamp range during sleep mode with the watchdog timer active, and the device supports in-circuit serial programming (ICSP) for production-line firmware loading even after the OTP window has been sealed. Typical applications include automotive sensor interfaces, appliance controls (washing machines, microwaves), security keypads, simple sensor conditioning, battery chargers, and low-cost consumer products. The industrial temperature range (-40C to +85C) is indicated by the 'I' suffix in the part number. Designers should note that OTP memory can only be programmed once - development should use the PIC12C508A-04/P (extended temperature, no 'I' suffix denotes commercial 0C to +70C) or a Flash-based pin-compatible PIC10F200/202/220/222 for prototyping. The 6 I/O pins share functions with the comparator, timer, and ICSP interfaces, so careful pin allocation is required. This page synthesizes distributor inventory, same-brand drop-in alternatives, and practical design notes that are not aggregated in a single manufacturer datasheet, giving engineers a faster path to sourcing and validation.

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PIC12C508A-04I/SM

PIC12C508A-04I/SM - 8-bit 4MHz OTP MCU, 8-SOIJ | Microchip

The Microchip Technology PIC12C508A-04I/SM is an 8-bit, fully-static CMOS microcontroller built on the PIC® 12C RISC architecture, offered in an 8-pin SOIJ package. It executes 33 single-word/single-cycle instructions, delivers 1 µs instruction execution at 4 MHz, and integrates 768 bytes of OTP program memory (512 x 12) and 25 bytes of general-purpose RAM. The device operates from 3 V to 5.5 V and is rated for the industrial temperature range of −40 °C to +85 °C. A microcontroller (MCU) is a single-chip computer containing a CPU, program and data memory, and I/O peripherals. MCUs sit within the broader taxonomy of embedded processors -> microcontrollers -> 8-bit microcontrollers -> CMOS RISC microcontrollers. The 12-bit program word width and Harvard bus architecture of the PIC12 family are deliberately simple, enabling deterministic timing and very small silicon footprints for cost-sensitive embedded applications. Key features include 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, Power-On Reset (POR), Device Reset Timer (DRT), and programmable code protection. The internal 4 MHz oscillator eliminates external timing components, freeing all eight pins for application use. The SOIJ-8 footprint allows direct reflow soldering on standard SMT lines. The architecture separates program memory (12-bit OTP) from data memory (8-bit-wide registers), enabling single-cycle instruction fetch and decode. The reduced 33-instruction RISC instruction set simplifies code generation, while the 200 ns minimum instruction cycle at 4 MHz (when derived from the internal RC oscillator divided appropriately) provides ample throughput for glue-logic replacement, sequencer, and protocol-translation tasks. Typical applications include low-cost consumer appliance control, sensor-interface front-ends, automotive interior accessories, industrial timing and sequencing, and PIC12C508 pin-compatible upgrades. The wide operating voltage window supports both 3.3 V and 5 V rails commonly found in mixed-signal systems, allowing the part to coexist with low-power sensors and 5 V relay drivers. When designing with this device, pay attention to OTP one-time programmability — once blown, code cannot be changed. For prototyping or field-upgradable designs, choose the Flash-based PIC12F508 successor (same pinout, larger memory, in-circuit serial programming). Decoupling the VDD pin with a 0.1 µF ceramic capacitor adjacent to the package is recommended for stable internal RC operation. This page synthesizes distributor pricing, pin-compatible same-family alternatives, and practical design notes not aggregated on the manufacturer datasheet, enabling faster sourcing decisions for engineers migrating legacy PIC12C508A designs to current production.

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PIC12C508A/JW

PIC12C508A/JW - 8-bit EPROM MCU, 4MHz, 768B, UV | Microchip

The Microchip Technology PIC12C508A/JW is an 8-bit CMOS RISC microcontroller housed in an 8-pin ceramic CDIP (JW) windowed package, designed for prototype and development use of one-time-programmable (OTP) PIC12C508A code. It executes instructions in a 1-microsecond cycle at 4 MHz and is based on the Enhanced PIC16C5X core with 33 single-word, single-cycle instructions. A microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data memory, and programmable I/O peripherals. The PIC12C508A belongs to the 8-bit microcontrollers -> PIC microcontrollers -> PIC12C family product hierarchy. It targets cost-sensitive embedded applications where a minimal 8-pin footprint and predictable deterministic execution are required. The /JW windowed package is specifically intended for erasing the EPROM via UV light during code development and prototyping, not for production deployment. Key features include 768 bytes of EPROM program memory (512 x 12), 25 bytes of RAM, 6 programmable I/O lines, an internal 4 MHz RC oscillator, an internal power-on reset, a watchdog timer, and power-saving SLEEP mode. The device operates from 2.5V to 5.5V across commercial 0C to +70C (this JW variant) and consumes less than 2 mA at 5V, 4 MHz. It is pin-compatible with the PIC12C508, PIC12CE518, and PIC12F508/509 Flash families, simplifying code migration during product transitions. The PIC12C508A uses a Harvard RISC architecture with separate program and data buses, a 12-bit wide instruction word delivering 2:1 code compression over typical 8-bit CISC controllers, and a hardware stack only two levels deep. The reduced instruction set and deterministic timing simplify real-time control firmware and embedded interrupt handling. The integrated MCLR/GP3 pin serves dual functions as master clear and general-purpose I/O with interrupt capability. Typical applications include low-cost appliance controllers, sensor signal conditioning, intelligent sensor front-ends, simple PWM LED drivers, automotive body modules (industrial grade variants), and educational/development kits where the EPROM window allows iterative code erase/reprogram cycles. Designers evaluating firmware before committing to OTP PIC12C508A-04/P or flash PIC12F508-I/P production parts use the JW package in the design phase. When designing with this MCU, ensure the GP3/MCLR pin is properly biased because it serves as both master clear and I/O. The device lacks an on-chip UART or ADC, so designers requiring analog or serial communication must add external components or migrate to the PIC12F675/683 Flash family with integrated peripherals. The JW ceramic windowed package is significantly more expensive than the plastic PDIP production version and should not be used in final production. This page synthesizes distributor pricing, drop-in package-compatible alternatives (PIC12C508A-04/P, PIC12F508-I/P), and practical design guidance not found in the manufacturer datasheet alone.

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PIC12C508AT-04E/SM

PIC12C508AT-04E/SM - 8-bit 4MHz OTP MCU, 768B, 6 I/O | Microchip

The Microchip Technology PIC12C508AT-04E/SM is an 8-bit, RISC-architecture CMOS microcontroller (MCU) with 4 MHz maximum clock speed, 768 bytes (512 × 12) of one-time programmable (OTP) program memory, and 25 bytes of data RAM, packaged in an 8-pin SOIJ (SM) with extended temperature grade support. An 8-bit microcontroller (MCU) is a single-chip processor that integrates a CPU core, program memory, data RAM, and I/O peripherals in a small form factor. The PIC12C508AT belongs to Microchip's PIC12C family, which sits inside the broader 8-bit PIC microcontroller hierarchy (8-bit MCU → microcontroller → embedded controller → semiconductor). These MCUs are widely used in cost-sensitive, space-constrained, and deterministic-control designs where low power and a minimal instruction set are more valuable than raw throughput. Key features include 33 single-word instructions, an 8-bit real-time clock/counter (TMR0) with an 8-bit programmable prescaler, power-on reset (POR), device reset timer (DRT), watchdog timer (WDT) with its own on-chip RC oscillator, programmable code protection, and an operating voltage range of 2.5 V to 5.5 V (extended). The part supports six general-purpose I/O pins and offers 1,000,000 erase/write cycles per the device family rating. Architecturally, the PIC12C508AT uses Harvard-style separate program and data paths with a 12-bit instruction word, enabling 200 ns instruction execution at 4 MHz. The OTP program memory (EPROM) is written during production or in-system once, supporting small-to-medium volume embedded products. The on-chip watchdog timer with its dedicated internal RC oscillator guarantees reliable operation even if the main system clock is disrupted, which is essential in industrial and automotive environments. Typical applications include low-cost consumer appliances, sensor signal conditioning, LED lighting controllers, automotive body electronics (subsystems), small motor control, and remote-control transmitters. The wide 2.5 V-5.5 V supply range and extended operating temperature range allow the part to drop into battery-powered and harsh-environment designs. When designing with this device, allocate sufficient time for OTP programming during pilot builds because OTP memory cannot be reprogrammed in-circuit. Always enable the watchdog timer in firmware and consider the EPROM device lifecycle (typically 1,000,000 erase/write cycles) when planning field updates. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers an at-a-glance comparison for sourcing and second-source planning.

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PIC12C508AT-04E/SN

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

The Microchip Technology PIC12C508AT-04E/SN is an 8-bit CMOS OTP-based microcontroller in an 8-pin SOIC package, operating at up to 4 MHz with 768 bytes (512 x 12) of program memory and 25 bytes of RAM. It uses a 12-bit instruction word PIC RISC architecture delivering 1 microsecond instruction execution with only 33 single-word instructions. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, and programmable I/O peripherals. The PIC12C508A belongs to the Microchip PIC10/12 family of small-form-factor 8-pin controllers, positioned within the broader category of microcontrollers -> microprocessors -> embedded computing -> semiconductors. These compact MCUs are the lowest-cost entry point into the PIC ecosystem and are widely deployed as glue logic replacement, sensor interface controllers, and standalone timed-control supervisors. Key features include 6 bidirectional I/O pins, an 8-bit real-time counter (TMR0) with an 8-bit programmable prescaler, Power-On Reset (POR), Device Reset Timer (DRT), a Watchdog Timer (WDT) with its own dedicated on-chip RC oscillator, programmable code protection, and 1,000,000 erase/write cycles typical endurance. The extended (-40C to +125C) operating temperature range and 3.0V-5.5V supply range make it suitable for harsh industrial environments. The PIC12C5XX architecture implements Harvard-style separate program/data paths with a 12-bit instruction word, achieving approximately 2:1 code compression over typical 8-bit microcontrollers. Its baseline core omits hardware interrupts, prioritizing code density and deterministic timing over peripheral integration - the result is a low-cost deterministic engine for tightly looped timing or state-machine tasks. Typical applications include appliance control, automotive sensor interfaces, simple sensor signal conditioning, low-cost timing controllers, and small logic replacements where an MCU adds flexibility at lower BOM cost than discrete logic. The 4 MHz internal RC option enables a clockless BOM in cost-sensitive designs. When designing, ensure Vdd decoupling uses a 0.1uF ceramic capacitor placed within 5 mm of the Vdd pin. MCLR must be tied to Vdd through a pull-up if not used externally to prevent spurious resets. With only six usable I/O, careful pin budgeting at the schematic stage is critical. This page synthesizes distributor pricing, drop-in alternatives, pin-by-pin replacement guidance, and design notes not found aggregated in the manufacturer datasheet.

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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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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PIC12C508A-04/P - 8-bit 4MHz OTP MCU 768B | Microchip | DIP-8

PIC12C508A-04/SM - 8-Bit 4MHz OTP MCU, 8-SOIJ | Microchip

PIC12C508A-04E/P - 8-bit 4MHz OTP MCU, 8-PDIP, Extended Temp | Microchip

PIC12C508A-04I/P - 8-bit 4MHz OTP MCU 768B | Microchip

PIC12C508A-04I/SM - 8-bit 4MHz OTP MCU, 8-SOIJ | Microchip

PIC12C508A/JW - 8-bit EPROM MCU, 4MHz, 768B, UV | Microchip

PIC12C508AT-04E/SM - 8-bit 4MHz OTP MCU, 768B, 6 I/O | Microchip

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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