PIC12C508A-04/P - 8-bit 4MHz OTP MCU 768B | Microchip | DIP-8
MPN: PIC12C508A-04/P ✓ Hoạt độngPIC12C508A-04/P Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho PIC12C508A-04/P — 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 PIC12C508A-04/P (cùng hình factor và footprint) — khác nhau ở Package, Timers, Program Memory Type, Core Architecture, Program Memory Size.
PIC12C508A-04I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC12C508-04/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC12F508-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC12C508A-04E/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC12C509A-04/P
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC12C508A-04/P Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 768 B (512 x 12 words) |
| Data RAM | 25 B |
| CPU Speed | 4 MHz (1 us instruction cycle) |
| Instruction Set | 33 single-word/single-cycle instructions |
| General-Purpose I/O | 6 pins |
| Timers | 1 x 8-bit TMR0 with programmable prescaler |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| Oscillator Modes | RC, LP, XT, HS (4 options) |
| In-Circuit Serial Programming (ICSP) | Yes |
| Operating Voltage | 2.5 V to 5.5 V |
| Supply Current (active, 4 MHz/5V) | < 2 mA typical |
| Supply Current (sleep) | < 1 uA typical |
| Nhiệt độ hoạt động | 0C to +70C (commercial) |
| Hộp | PDIP-8 (300 mil) |
| Kiểu lắp đặt | Through-Hole |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC12C508A-04/P
| Chân 1 | VSS — Ground reference |
| Chân 2 | T0CKI/GP5 — Timer0 clock input / general-purpose I/O pin 5 |
| Chân 3 | GP4/OSC2 — General-purpose I/O pin 4 / oscillator output |
| Chân 4 | GP3/MCLR — General-purpose I/O pin 3 / Master Clear (reset) input |
| Chân 5 | GP2/OSC1 — General-purpose I/O pin 2 / oscillator input |
| Chân 6 | GP1 — General-purpose I/O pin 1 |
| Chân 7 | GP0 — General-purpose I/O pin 0 |
| Chân 8 | VDD — Positive supply voltage (2.5V to 5.5V) |
Ứng dụng tiêu biểu
PIC12C508A-04/P phù hợp cho 6 Áp dụngs: Appliance Control Modules, LED Driver Controllers, Simple Sensor Interface Hubs, Low-End Consumer Electronics, Battery-Powered Devices, Automotive Interior Accessories.
Appliance Control Modules
The PIC12C508A-04/P fits appliance control modules such as microwave oven user interfaces, washing-machine front panels, and dishwasher timer boards, where 6 general-purpose I/O pins are sufficient to drive a 7-segment display, scan a 4x3 keypad, and control a relay or triac. Its 4 MHz CPU provides enough bandwidth for keypad debounce, relay timing, and basic state-machine logic without external components. Compared with discrete logic, the MCU's 33 single-cycle instructions collapse what would be a dozen gates into a single 1.60 USD part, and the 8-pin PDIP footprint drops directly onto legacy through-hole PCBs used in white goods. The 25-byte RAM accommodates debounce counters and mode flags; the 768-byte OTP memory holds the full appliance state machine.
Được đề xuất
LED Driver Controllers
The PIC12C508A-04/P serves as a low-cost LED driver controller in decorative lighting, signage, and indicator-strip applications, where 6 I/O pins can drive multiple LED channels via PWM generated in software. Its 4 MHz core allows software PWM at refresh rates above 100 Hz with 8-bit resolution, sufficient to avoid visible flicker in dimming applications. The MCU's 2.5-5.5V operating range matches typical LED-rail voltages, and the less-than-1 uA sleep current enables battery-backed LED nightlights that idle for months. Compared with dedicated LED-driver ICs, the PIC12C508A-04/P adds general-purpose programmability, letting one MCU control RGB color mix and blink patterns across multiple channels.
Được đề xuất
Simple Sensor Interface Hubs
The PIC12C508A-04/P is well-suited as a simple sensor interface hub for thermistor reading, photoresistor light-level sampling, and mechanical-switch polling, where a single 8-bit ADC channel and a few digital I/O lines replace dedicated sensor-conditioning circuits. Its 8-bit TMR0 with programmable prescaler provides accurate timing for periodic sensor reads at intervals from microseconds to seconds. The on-chip watchdog timer ensures the sensor-reading firmware recovers from glitches in electrically noisy industrial environments. Compared with a dedicated sensor-interface ASIC, the PIC12C508A-04/P offers calibration flexibility through software, allowing one part number to serve multiple product variants by changing the firmware stored in 768 bytes of OTP.
Được đề xuất
Low-End Consumer Electronics
The PIC12C508A-04/P is deployed in low-end consumer electronics such as remote-control key fobs, novelty toys, and small kitchen gadgets, where 6 I/O pins and 768 bytes of program memory are sufficient to handle button inputs, IR transmission, and basic sound or motion effects. Its 1 us instruction cycle at 4 MHz easily decodes RC5 or NEC IR protocols in software without an external decoder IC. The PDIP-8 package supports both automated through-hole assembly and hand-prototyping in maker communities, lowering entry barriers for hobby products. The MCU's 2.5-5.5V operating range and under-2-mA active current align with 3V coin-cell and 5V USB-supplied consumer products.
Được đề xuất
Battery-Powered Devices
The PIC12C508A-04/P is ideal for battery-powered devices such as wireless doorbell transmitters, smoke-detector test circuits, and personal health monitors, where the sub-1 uA sleep current extends battery life into the multi-year range. The MCU wakes from sleep on watchdog overflow or external interrupt, executes a brief measurement or transmit routine, and returns to sleep, all within a few hundred microseconds of active time per duty cycle. Its 2.5V minimum operating voltage allows operation from two nearly-depleted AA cells. Compared with discrete low-power timer circuits, the PIC12C508A-04/P replaces 4-6 analog components with a single programmable part that adapts to changing product requirements through software updates prior to OTP programming.
Được đề xuất
Automotive Interior Accessories
The PIC12C508A-04/P serves in non-safety automotive interior accessories such as ambient lighting controllers, USB-charger status indicators, and seat-occupancy indicator LEDs, where 6 I/O pins drive a small number of outputs and the commercial 0C to +70C temperature range is sufficient for cabin environments. Its 33-instruction RISC core handles LIN-like bit-banged communication or simple PWM dimming of interior LED strips. The PDIP-8 package suits through-hole assemblies in aftermarket accessory modules. The 768-byte OTP memory holds the full accessory state machine, and the sub-1 uA sleep current prevents vehicle battery drain when the car is parked for weeks.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC12C508A-04/P — 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 | PIC12C508A-04I/P | PIC12C508-04/P | PIC12F508-I/P | PIC12C508A-04E/P | PIC12C509A-04/P |
|---|---|---|---|---|---|---|
| Package | PDIP-8 | PDIP-8 (same) | PDIP-8 (same) | PDIP-8 (same) | PDIP-8 (same) | PDIP-8 (same) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 768 B OTP | 768 B OTP | 768 B OTP | 768 B Flash | 768 B OTP | 1.5 KB OTP |
| Data RAM | 25 B | 25 B | 25 B | 25 B | 25 B | 41 B |
| Max CPU Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Memory Type | OTP | OTP | OTP | Flash | OTP | OTP |
| I/O Pins | 6 | 6 | 6 | 6 | 6 | 6 |
| Operating Temperature | 0C to +70C | -40C to +85C | 0C to +70C | -40C to +85C | -40C to +125C | 0C to +70C |
| Reprogrammable | No (OTP) | No (OTP) | No (OTP) | Yes (Flash) | No (OTP) | No (OTP) |
Bảo phân biệt quan trọng
- Industry-standard 8-pin PDIP through-hole package for hand-prototyping and legacy designs (vsPIC12C508A-04/SM (SOIC-8 surface mount))
- OTP memory for lowest per-unit cost at high volume (vsPIC12F508-I/P (Flash-based equivalent))
- RISC architecture with 33 single-cycle instructions simplifies firmware development (vsDiscrete logic or 8051-based 8-bit MCUs)
Ghi chú thiết kế
Because the PIC12C508A-04/P uses OTP program memory, it cannot be reprogrammed once written. Engineers must fully validate firmware on a Flash-based equivalent (such as the PIC12F508-I/P, same PDIP-8 footprint) before committing to OTP volume production. Programming is performed via Microchip's MPLAB X IDE and ICD or PICkit programmers using the ICSP interface (GP0/GP1/GP3 pins). Always order at least 5-10% extra OTP units for engineering rework and field-replacement inventory.
Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 8) to suppress digital switching noise, and a 10 uF bulk capacitor on the same supply rail if the PCB is shared with relays or other noisy loads. The MCLR pin (pin 4) requires a 10 kohm pull-up to VDD; a 100 nF capacitor from MCLR to ground is optional but recommended for noisy environments. The OSC1/OSC2 pins should be routed with short traces to the crystal or resonator to reduce EMI and oscillator startup issues.
For battery-powered designs, leverage the PIC12C508A-04/P's sub-1 uA sleep current by entering sleep mode (SLEEP instruction) and waking on watchdog overflow (WDT) or external interrupt (GP0/GP1/GP3). Average current consumption can drop below 10 uA in typical 1% duty-cycle sensor-reading applications, enabling 2-5 year battery life from a single CR2032 coin cell. Estimated: 10 uA average from 1% active duty cycle (2 mA active / 100) + 1 uA sleep current. Use the internal 4 MHz RC oscillator to avoid the additional current draw of an external crystal in cost-sensitive applications.
Keep the ICSP programming lines (GP0/GP1/GP3) accessible on the PCB via a 3-pin or 5-pin header for in-circuit programming during production. If the design uses GP0/GP1/GP3 as outputs, ensure they can be temporarily tri-stated during programming by adding 10 kohm series resistors or jumpers. The MCLR pull-up should remain present even when the ICSP header is disconnected, otherwise the MCU will not run. Avoid routing high-frequency or high-current signals adjacent to OSC1/OSC2 to prevent oscillator drift.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Not AEC-Q100 qualified; for AEC-Q100 automotive applications consider PIC12F508-E/P or PIC16F family. Lead-free PDIP-8 package, halogen-free per Microchip material declaration.
