PIC12CE518-04I/SN
PIC12CE518-04I/SN - 8-bit 4MHz OTP MCU w/ EEPROM | Microchip
The Microchip Technology PIC12CE518-04I/SN is an 8-bit CMOS OTP-based microcontroller in the PIC12C family, featuring 768 bytes of program memory (512 x 12 words), 25 bytes of RAM, 16 bytes of EEPROM data memory, and 6 I/O pins, packaged in an 8-pin SOIC (SN) and rated for 4 MHz operation over the industrial temperature range. The device executes single-cycle instructions in 1 microsecond at 4 MHz, providing deterministic timing for embedded control loops in compact form factors. The -04I suffix indicates the 4 MHz speed grade with industrial temperature range (-40C to +85C), while /SN denotes the 8-SOIC surface-mount package.
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral I/O on a single silicon die. The PIC12CE518 belongs to the OTP (One-Time-Programmable) PIC12C family, which historically targeted low-cost, low-pin-count embedded applications where production volumes justify one-time programming. Within the broader taxonomy, an 8-bit MCU sits between simple 4-bit controllers and 32-bit microprocessors, offering a balance of cost, ease of use, and code density for applications such as consumer appliances, sensor interfaces, and battery-operated devices. The on-chip EEPROM data memory is a distinguishing feature, allowing parameter storage without external serial EEPROM.
Key features include the Enhanced PIC16C5X core architecture with only 33 single-word instructions, four oscillator selections (including an internal 4 MHz RC oscillator with programmable factory calibration), 25 mA source/sink capability per I/O pin suitable for direct LED driving, programmable code protection, a Watchdog Timer with independent oscillator, Power-on Reset, and an operating voltage range of 2.5V to 5.5V. The device consumes only a few milliamps in active mode and supports a power-saving SLEEP mode. Each I/O pin can source or sink 25 mA, eliminating the need for external driver transistors in many interface circuits.
The PIC12CE518 uses a Harvard RISC architecture with separate program and data buses, executing most instructions in a single instruction cycle. The 12-bit wide instruction word optimizes code density for the PIC instruction set, and the two-level deep hardware stack supports subroutine nesting. The 16 bytes of on-chip EEPROM provide non-volatile storage for calibration constants, configuration parameters, or user preferences, with endurance rated for one million erase/write cycles typical. The internal 4 MHz RC oscillator eliminates external crystal components in cost-sensitive designs.
Typical applications include remote control transmitters, low-end consumer electronics, LED lighting controllers, battery chargers, sensor signal conditioning front-ends, smart card readers, and replacement of discrete logic in glue-logic consolidation designs. The 8-pin SOIC package and minimal external component count make it suitable for space-constrained PCB designs. The wide operating voltage range (2.5V to 5.5V) supports both 3.3V and 5V system rails directly from common battery chemistries.
When designing with this device, note that OTP memory cannot be reprogrammed in-circuit, so code development must use a windowed (JW) or compatible flash-based PIC12F part for prototyping. Microchip recommends migrating to PIC12F629 or PIC10F series for new designs. Ensure the MCLR pin is properly tied high via a resistor for normal operation, and place decoupling capacitors close to VDD.
This page synthesizes distributor pricing, drop-in alternatives within the same 8-SOIC footprint, and practical design notes not consolidated on any single manufacturer or distributor page, accelerating part selection and BOM validation.
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