PIC12LC508AT-04/SM Tech Specifications
Microchip - PIC12LC508AT-04/SM technical specifications, attributes, parameters and parts with similar specifications to Microchip - PIC12LC508AT-04/SM

Product Attribute	Attribute Value
Part Number	PIC12LC508AT-04/SM
Package	-
Description	-
Stock Condition	Get 6820 pcs available quantity at Allelco
Payment	PayPal / TT / Credit Card / Western Union
Allelco Certifications	ESD / ISO 9001 / ISO 13485 / ISO 28000

Product Attribute	Attribute Value
Manufacturer	Microchip Technology
RoHs Status	-
Warranty	100% Perfect Functions
Transport port	Hong Kong
Shipping by	DHL / FedEx / UPS / TNT / SF Express
RFQ Email	info@allelco.com

Parts Introduction

Manufacturer Part Number

PIC12LC508AT-04/SM

Manufacturer

microchip-technology

Introduction

The PIC12LC508AT-04/SM is a low-power, 8-bit microcontroller from the PIC® 12C series. It features a PIC core, 768 bytes of OTP program memory, and 25 bytes of RAM. The device is designed for a wide range of embedded applications that require a compact and cost-effective solution.

Product Features and Performance

8-bit PIC core

4 MHz operating speed

768 bytes of OTP program memory

25 bytes of RAM

Power-on Reset (POR) and Watchdog Timer (WDT) peripherals

5 I/O pins

Operating voltage range of 2.5V to 5.5V

Operating temperature range of 0°C to 70°C

Product Advantages

Compact and cost-effective solution for embedded applications

Low-power consumption for battery-powered devices

Reliable operation with built-in POR and WDT peripherals

Flexible I/O options for interfacing with various sensors and peripherals

Key Reasons to Choose This Product

Proven Microchip technology for reliable performance

Suitable for a wide range of embedded applications

Easy to integrate into your design with the available development tools

Competitive pricing and availability

Quality and Safety Features

Robust design and manufacturing process

Compliance with industry standards for safety and reliability

Compatibility

Compatible with Microchip's extensive ecosystem of development tools and software

Application Areas

Automotive and industrial control systems

Home automation and security systems

Portable and battery-powered devices

Sensor and measurement applications

Product Lifecycle

The PIC12LC508AT-04/SM is an active product. There may be equivalent or alternative models available from Microchip. Please contact our website's sales team for more information on the current product status and availability of similar or updated models.

Frequently Asked Questions(FAQ)

How does the PIC12LC508AT-04/SM compare to the PIC12F508T-I/SN in terms of program memory access and reliability for low-cost embedded control applications?: The PIC12LC508AT-04/SM uses One-Time Programmable (OTP) memory, which means it cannot be reprogrammed after manufacturing, making it suitable for stable, non-updatable firmware. In contrast, the PIC12F508T-I/SN typically employs Flash memory, allowing in-system reprogramming. For applications where code stability is critical and updates are not required—such as fixed-function sensors or consumer electronics—the OTP architecture of the PIC12LC508AT-04/SM offers enhanced security against unintended modifications but lacks flexibility. This trade-off favors long-term reliability over development iteration speed.

What are the implications of using the 8-SOIJ package on thermal performance and PCB layout for the PIC12LC508AT-04/SM in compact designs?: The 8-SOIJ package has a smaller footprint than standard SOIC variants due to its recessed leads, which can improve space efficiency in dense PCBs. However, the reduced lead exposure may limit thermal dissipation compared to wider or exposed pad packages. When designing with the PIC12LC508AT-04/SM, ensure adequate copper pour under the device for heat spreading, especially during power-up surges or when driving external loads through its five I/O pins. Proper layout minimizes parasitic inductance and supports stable operation across the full operating temperature range of 0°C to 70°C.

Can the PIC12LC508AT-04/SM reliably operate at supply voltages near the lower end of its 2.5V to 5.5V range, particularly for battery-powered devices?: Yes, the PIC12LC508AT-04/SM is designed to function down to 2.5V, making it viable for low-power applications such as remote sensors or portable instrumentation. At 2.5V, internal oscillator accuracy may degrade slightly due to reduced noise margins, and execution speed could be impacted if clock scaling is not implemented. Nevertheless, its built-in Power-on Reset (POR) and Watchdog Timer (WDT) help maintain system integrity under voltage fluctuations. Careful consideration of instruction cycle timing and peripheral initialization is advised when operating near the minimum supply threshold.

How does the internal oscillator configuration affect timing precision in the PIC12LC508AT-04/SM when used without an external crystal?: The PIC12LC508AT-04/SM relies on an internal RC oscillator running at approximately 4MHz, which provides sufficient timing for most basic control tasks but exhibits tolerance variations of ±10% typical (±2% initial accuracy). This variability impacts delay loops and time-critical operations unless compensated via calibration routines or external synchronization. For applications requiring tighter timing control, such as UART baud rate generation or PWM resolution, users should implement software correction or consider alternative clock sources despite the absence of dedicated external oscillator support.

Is it feasible to use the PIC12LC508AT-04/SM in automotive environments, given its specified operating temperature range?: No, the PIC12LC508AT-04/SM is rated for industrial or commercial environments only, with an operating temperature range of 0°C to 70°C. Automotive-grade components must withstand broader thermal extremes, often from -40°C to +125°C, along with higher vibration and humidity exposure. While the device performs well within office or industrial settings, substituting it into automotive systems would violate reliability standards and risk premature failure. For similar functionality in harsher conditions, Microchip offers qualified automotive variants like the AEC-Q100 compliant PIC12(LC)F508 family.

What considerations apply when selecting pull-up resistors for the open-drain I/O pins on the PIC12LC508AT-04/SM interfacing with external logic levels?: Since the PIC12LC508AT-04/SM’s I/O pins are bidirectional but not inherently strong drivers, external pull-up resistors are often necessary when driving open-collector outputs or reading open inputs. Typical values range from 4.7kΩ to 10kΩ depending on bus capacitance and desired rise times. When interfacing between 3.3V and 5V logic domains, resistor selection must balance current consumption against signal integrity. Using excessively high resistances increases susceptibility to noise, while low values raise quiescent current in battery-operated designs. Always verify switching characteristics under worst-case load conditions.

How much RAM is available for stack and variable storage in the PIC12LC508AT-04/SM, and what limitations does this impose on recursive algorithms?: The PIC12LC508AT-04/SM includes 25 bytes of RAM organized as 25 x 8-bit registers. Of these, only 13–14 general-purpose registers are directly addressable; the remaining bytes serve special functions including the STATUS register and indirect addressing space. Given that subroutine calls consume stack depth incrementally, deep nesting or recursion is impractical due to limited stack capacity. Developers should prefer iterative constructs or inline expansion for complex logic, ensuring no single task exceeds 3–4 nested call levels to avoid unpredictable behavior from stack overflow.

What role does the Watchdog Timer (WDT) play in enhancing system robustness when using the PIC12LC508AT-04/SM in unattended installations?: The WDT in the PIC12LC508AT-04/SM resets the microcontroller if software execution stalls due to infinite loops, unhandled interrupts, or corrupted program flow. Configured typically with a 18ms timeout (adjustable via fuses), it restores normal operation automatically, improving reliability in field-deployed systems like metering or monitoring devices. However, proper servicing—clearing the WDT regularly within the main loop—is essential; failure to do so triggers a reset cycle that may mask underlying software defects. This feature complements POR but does not protect against hardware faults like brownout conditions.

Why might someone choose the PIC12LC508AT-04/SM over newer Flash-based PIC12 series microcontrollers despite its OTP limitation?: The decision hinges on cost-sensitive production volumes where NRE savings outweigh reflash capability needs. OTP devices like the PIC12LC508AT-04/SM eliminate programming infrastructure during mass production, reducing per-unit cost and simplifying supply chain logistics. Additionally, OTP offers inherent protection against firmware piracy or accidental overwrite, which benefits products with fixed intellectual property. While development iterations require mask changes or pre-programmed units, this model suits high-volume, unchanging firmware applications such as utility meters or disposable medical devices.

Does the PIC12LC508AT-04/SM support interrupt-driven design patterns effectively given its limited peripheral set?: Yes, the PIC12LC508AT-04/SM supports interrupt-on-change on its five I/O pins and internal peripherals like the WDT, enabling responsive event handling without constant polling. However, the narrow interrupt vector table and lack of advanced modules (e.g., comparators or ADCs) constrain complexity. Developers can implement lightweight ISRs for pin state changes or timer events, but must minimize ISR duration to preserve real-time responsiveness. Given the 8-bit core and 4MHz clock, interrupt latency remains manageable for simple tasks like button debouncing or sensor sampling.

How does the Moisture Sensitivity Level (MSL) rating of 1 for the PIC12LC508AT-04/SM simplify handling and storage in manufacturing environments?: MSL 1 indicates unlimited floor life—the PIC12LC508AT-04/SM can sit unprotected on a factory bench indefinitely without requiring bake cycles or dry storage prior to assembly. This significantly eases inventory management and reduces processing steps in SMT lines, lowering overall manufacturing cost. Combined with RoHS3 compliance and EAR99 classification, the device integrates smoothly into global supply chains without export restrictions or special handling protocols, supporting agile production schedules.

What are the consequences of exceeding the maximum junction temperature during prolonged operation of the PIC12LC508AT-04/SM?: Operating beyond the absolute maximum rating of 150°C risks permanent damage to the silicon die, though the specified operational range caps at 70°C ambient. Even within specification, sustained high ambient temperatures reduce mean time between failures by accelerating electromigration and oxide degradation. In enclosures with poor airflow or adjacent hot components, derating the duty cycle or adding thermal relief may be necessary. Thermal modeling using package thermal resistance values helps predict junction temperature under real-world conditions, ensuring long-term reliability.

Can the PIC12LC508AT-04/SM drive inductive loads directly through its I/O pins, or is an external driver required?: Direct driving of moderate inductive loads (e.g., small relays or LEDs) is possible due to the device’s 25mA sink/source capability per pin (typical), but sustained switching of larger loads demands external transistors or MOSFETs. Inductive kickback from coils requires flyback diodes across the load to protect I/O pins from voltage spikes. Without such protection, repeated switching can degrade output drivers over time. Therefore, while the PIC12LC508AT-04/SM can initiate control actions, robust interface circuits are recommended for energy-harvesting or motor-control scenarios.

How does program memory organization (512 x 12 bits) influence firmware structure in the PIC12LC508AT-04/SM?: Each instruction occupies one 12-bit word, so the 768-byte program memory translates to exactly 6144 bits (768 × 12). This limits executable code size severely: a typical C-compiled application may occupy 70–80% of available space even without libraries. Developers must optimize algorithms, minimize string usage, and avoid floating-point operations. Linker scripts should prioritize critical functions in lower memory addresses to accommodate bootloaders or interrupt vectors, ensuring predictable behavior during power-on sequences.

What alternatives exist if the PIC12LC508AT-04/SM runs out of program memory for a growing firmware requirement?: Migration to a larger member of the PIC12F508 family—such as the PIC12F510 or PIC12F519—provides expanded flash memory (up to 2KB) while retaining compatibility in pin count and basic peripherals. Alternatively, upgrading to the PIC16F505 or PIC12LF1552 offers more headroom with modern features like internal oscillators calibrated to ±1%. Transitioning from OTP to Flash also enables over-the-air updates or debugging support. Evaluation boards and migration guides from Microchip facilitate smooth transitions with minimal redesign effort.

Is reverse-engineering or cloning of firmware stored in the OTP ROM of the PIC12LC508AT-04/SM feasible?: Yes, but with significant technical barriers. Extracting raw data requires specialized UV-erasable EPROM programmers or physical decapsulation followed by electron microscopy, both costly and destructive. Once obtained, decoding the proprietary PIC assembly language demands deep expertise in PIC instruction sets. While not impossible, this process is impractical for casual attackers and serves as a deterrent rather than an impenetrable barrier. For sensitive applications, combining OTP with obfuscated code flow or external encryption keys adds further layers of protection.

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Customer Reviews

Evaluation: 10 Articles

Nath***rooks

Jun 11, 2026

Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.
Dani***alkerTech

Jun 1, 2026

Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.
Yuki***aka88

May 26, 2026

信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。
Stev***aker

May 20, 2026

Solid diode for power rectification. Works well in switching circuits.
Bran***Lewis

May 11, 2026

Compact FPGA with good performance. Suitable for basic signal processing tasks.
Oliv***arris

May 7, 2026

Reliable I/O expander. Works well in embedded control applications.
Jess***Jones

Apr 17, 2026

It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.
Mich***Smith

Apr 17, 2026

Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.
Aman***arris

Apr 3, 2026

It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.
Mike***nch

Apr 3, 2026

Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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America	Brazil	7
Europe	Germany	5
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Oceania	Australia	6
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