PIC12F508-I/MS - 8-bit 4MHz Flash MCU 768B | Microchip
MPN: PIC12F508-I/MS ✓ Hoạt độngPIC12F508-I/MS Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates an 8-bit data-path CPU, program memory, working RAM, and peripherals on one die. The PIC12F508 belongs to Microchip's baseline PIC10/12 architecture family, sitting within the broader hierarchy of microcontrollers -> embedded processors -> semiconductors -> integrated circuits. Baseline PIC devices use a 12-bit wide instruction set that yields roughly 2:1 code compression versus competing 8-bit cores, enabling more application logic in fewer bytes of flash.
Key features include a hardware single-cycle multiplier-free ALU, internal 4 MHz RC oscillator calibrated to +/- 1 percent typical accuracy, watchdog timer with on-chip low-power RC oscillator, power-on reset, brown-out reset, and an in-circuit serial programming (ICSP) interface. The device sources/sinks up to 25 mA per I/O pin and supports industrial -40C to +85C operating temperatures.
Architecturally the PIC12F508 uses a RISC-style Harvard design with separate program and data buses, a single accumulator (W register) plus a 32-byte register file, and a 2-stage pipeline. The flash memory supports in-circuit serial programming, allowing firmware to be updated on assembled boards without removing the device. A 4 MHz internal oscillator eliminates the external crystal typically required, reducing BOM cost and PCB area.
Typical applications include LED lighting controllers, battery chargers, simple sensor signal conditioning, low-cost consumer appliances, and pin-compatible upgrades to legacy PIC12C508A designs. The compact MSOP-8 footprint makes it ideal for space-constrained designs.
When designing with this MCU, allocate adequate decoupling (100 nF + 10 uF bulk) near the VDD pin. The ICSP pins (GP1/GP0) must be accessible for in-circuit programming; consider adding test points or a 2x3 header to the PCB.
This page synthesizes verified distributor pricing, pin-compatible drop-in alternatives from Microchip and competitor equivalents, and practical design notes not found in a single source.
Bộ thay thế dễ dàng lắp đặt cho PIC12F508-I/MS — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC12F508-I/MS (cùng hình factor và footprint) — khác nhau ở Package, Timers, Watchdog Timer, Internal Oscillator, RoHS Status.
PIC12F509-I/MS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC12F508-E/MS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC12F508-I/SN
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC12F509-I/SN
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC12F508T-I/MS
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC12F508-I/MC
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC12F508-I/MS Tỷ lệ tối đa & tính chất điện
| Product Family | PIC12 baseline |
| Core | 8-bit RISC Harvard |
| Instruction Set | 12-bit wide, 33 instructions |
| Program Memory (Flash) | 768 B (512 x 12 words) |
| RAM | 25 B |
| Maximum CPU Speed | 4 MHz |
| Performance | 4 MIPS @ 4 MHz |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 6 (GP0-GP5) |
| Timers | 1 x 8-bit (TMR0 with watchdog) |
| Watchdog Timer | Yes (independent RC oscillator) |
| Brown-Out Reset | Yes |
| Power-On Reset | Yes |
| In-Circuit Serial Programming (ICSP) | Yes |
| Internal Oscillator | 4 MHz RC (+/- 1 percent typical) |
| I/O Pin Current (source/sink) | 25 mA / 25 mA |
| Nhiệt độ hoạt động | -40 C to +85 C (industrial) |
| Hộp | MSOP-8 (3 x 3 mm) |
| Kiểu lắp đặt | Surface Mount |
| Lead-Free / RoHS | Yes (lead-free finish) |
Cấu hình chân PIC12F508-I/MS
| Chân 1 | GP5/OSC1/CLKIN — General-purpose I/O / external oscillator input |
| Chân 2 | GP4/OSC2/CLKOUT — General-purpose I/O / oscillator output |
| Chân 3 | GP3/MCLR/VPP — General-purpose input only / Master Clear reset / programming voltage |
| Chân 4 | GP2/T0CKI/INT/COUT — General-purpose I/O / Timer0 clock input / external interrupt / comparator output |
| Chân 5 | GP1/ICSPCLK — General-purpose I/O / ICSP serial clock |
| Chân 6 | GP0/ICSPDAT — General-purpose I/O / ICSP serial data |
| Chân 7 | VSS — Ground reference |
| Chân 8 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
Ứng dụng tiêu biểu
PIC12F508-I/MS phù hợp cho 6 Áp dụngs: LED Lighting Controller, Battery Charger / Monitor, Simple Sensor Signal Conditioning, Low-Cost Consumer Appliance Controller, Legacy PIC12C508A Replacement, Hobby / Maker Educational Projects.
LED Lighting Controller
The PIC12F508-I/MS is well suited to LED lighting controllers and decorative light drivers where cost and PCB area dominate the design. Its 6 bidirectional I/O pins can each source/sink 25 mA per the Microchip datasheet 41236E, which is enough to drive small indicator LEDs or low-current LED strips via transistors. The 4 MHz internal oscillator eliminates external crystals, and the 768-byte flash holds typical PWM-pattern or chase-effect firmware comfortably. The wide 2.0-5.5V supply range supports both 3.3V and 5V LED designs, while brown-out reset prevents flicker during brown-outs. The compact MSOP-8 footprint fits inside bulb-base PCBs where every square millimeter matters.
Được đề xuất
Battery Charger / Monitor
The PIC12F508-I/MS fits low-cost single-cell and multi-cell battery chargers and simple fuel-gauge monitors. The 2.0-5.5V operating range covers 1S lithium packs down to depletion and 4-cell NiMH packs up to full charge. Per Microchip datasheet 41236E, the 25 mA I/O sourcing capability is sufficient to drive indicator LEDs and small MOSFET gate signals for protection circuits. The internal 4 MHz RC oscillator and on-chip watchdog reduce BOM cost - no external crystal or supervisor IC required. The 768-byte flash fits typical CC-CV charge profiles and timeout-based termination logic.
Được đề xuất
Simple Sensor Signal Conditioning
The PIC12F508-I/MS is a good fit for simple sensor signal-conditioning tasks like thermistor linearization, switch debouncing, or threshold detectors. Per datasheet 41236E, the 8-bit ADC-free architecture is best for digital sensors or comparator-style analog tasks; designers can implement software timing loops using TMR0 for periodic sampling. The 6 I/O pins provide enough headroom for sensor input, control output, status LED, and ICSP programming without multiplexing. Industrial -40C to +85C temperature range supports outdoor sensor housings and factory-floor environments.
Được đề xuất
Low-Cost Consumer Appliance Controller
The PIC12F508-I/MS is widely deployed in low-cost consumer appliances such as fans, toasters, coffee makers, and personal care devices. Per Microchip datasheet 41236E, the combination of 6 I/O, watchdog timer, brown-out reset, and 25 mA I/O drive directly addresses the BOM-conscious appliance market. The internal RC oscillator and 2.0-5.5V range handle 3.3V battery-powered or 5V mains-derived supplies equally well. The 768-byte flash accommodates typical state-machine firmware with mode buttons, timers, and indicator LEDs.
Được đề xuất
Legacy PIC12C508A Replacement
The PIC12F508-I/MS is the flash-based replacement for the older EPROM-based PIC12C508A in the same MSOP-8 package and pinout, providing a drop-in upgrade path. Per Microchip datasheet 41236E, the PIC12F508 adds in-circuit serial programming and offers the same 768-byte program memory. Designers retiring the obsolete PIC12C508A in favor of an active-life-cycle part can usually swap directly with no PCB change. Per the FindMyChip alternatives data, the /MS variant is one of the most commonly requested PIC12C508A equivalents.
Được đề xuất
Hobby / Maker Educational Projects
The PIC12F508-I/MS is a popular entry point for hobbyists, students, and makers learning 8-bit embedded development. The MSOP-8 footprint is breadboard-friendly with a breakout adapter, and the wide 2.0-5.5V range lets learners power the chip from a single Li-ion cell or USB 5V. Per Microchip datasheet 41236E, the in-circuit serial programming interface lets students reprogram the device in-place without removing it from the breadboard. The PICkit programmer and MPLAB X IDE are free, and the 768-byte flash is enough to host classic blink-LED, button-debounce, and tone-generation exercises.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC12F508-I/MS — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PIC12F509-I/MS | PIC12F508-E/MS | PIC12F508-I/SN | PIC12F509-I/SN | PIC12F508T-I/MS | PIC12F508-I/MC |
|---|---|---|---|---|---|---|---|
| Package | MSOP-8 | MSOP-8 | MSOP-8 | SOIC-8 | SOIC-8 | MSOP-8 | DFN-8 |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 768 B | 1.5 KB | 768 B | 768 B | 1.5 KB | 768 B | 768 B |
| RAM | 25 B | 41 B | 25 B | 25 B | 41 B | 25 B | 25 B |
| Maximum CPU Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Supply Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| I/O Pins | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Internal RC Oscillator | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| ICSP Support | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Bảo phân biệt quan trọng
- Lowest-cost Microchip baseline MCU in active production (vsPIC12F1822-I/MS)
- MSOP-8 surface-mount package option (vsPIC12F508-I/P (DIP-8))
- Drop-in compatibility with PIC12F509 family (vsPIC12F508 vs PIC12C508A)
Ghi chú thiết kế
Place a 100 nF ceramic decoupling capacitor as close as possible to the VDD pin (pin 8), plus a 10 uF bulk capacitor on the same supply trace. The PIC12F508 datasheet (41236E) recommends minimizing VDD trace inductance to prevent logic errors during high-current I/O switching events. If using GP3 as MCLR, route the MCLR pull-up resistor network close to pin 3 to ensure clean reset behavior.
Reserve the ICSP signals GP1/ICSPCLK (pin 5) and GP0/ICSPDAT (pin 6) for programming - do not load them with heavy external circuitry that would prevent the PICkit from driving them during programming. A 2x3 0.1-inch header footprint or simple test pads is the recommended approach. Per Microchip development guidelines, adding a small resistor in series with the ICSP lines (under 1 kohm) can protect the programmer from production-board shorts.
Configuration word bits must be set correctly or the MCU may fail to start. The PIC12F508 datasheet (41236E) flags the WDT (watchdog timer) and code-protection bits as commonly missed - leaving WDT enabled in a tight loop without servicing will trigger a reset. Brown-out voltage threshold (BOD) should be selected to match your supply rail; an incorrect threshold causes either spurious resets (too high) or undefined execution at low voltage (too low).
The MSOP-8 thermal pad (if present) is electrically floating and should be soldered to a small copper pour for mechanical reliability, but it is NOT a ground connection on this part. Per the Microchip MSOP-8 package drawing, the center pad on some MSOP-8 derivatives is a no-connect - verify against the specific package outline before tying it to ground.
Thông tin tuân thủ
RoHS compliant and lead-free per Microchip product page and DigiKey listing (2026-09-15). Not AEC-Q100 qualified - automotive applications should use PIC16F or PIC18 families. Halogen-free status not stated in available data.
