PIC12C509-04E/SM - 8-bit MCU 1.5KB OTP 4MHz SOIJ-8 | Microchip
MPN: PIC12C509-04E/SM ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.1 | $2.10 |
| 10 | $1.89 | $18.90 |
| 100 | $1.65 | $165.00 |
| 500 | $1.42 | $710.00 |
| 1,000 | $1.18 | $1,180.00 |
PIC12C509-04E/SM Overview
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.
Drop-in alternatives for PIC12C509-04E/SM — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC12C509-04E/SM (same form factor and footprint) — differing in Core Architecture, Package, Program Memory Size, Timers, Program Memory Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC12C509A-04E/SM
✅ Drop-In✓ In Stock
$1.55 / Unit
View Datasheet →PIC12C509-04/SM
✅ Drop-In✓ In Stock
$1.87 / Unit
View Datasheet →PIC12C509A-04/SM
✅ Drop-In✓ In Stock
$0.99 / Unit
View Datasheet →PIC12C509AT-04E/SM
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC12C509T-04E/SM
✅ Drop-In📋 Reference alternative (not in catalog)
PIC12F508-I/SM
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC12F509-I/SM
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC12C509-04E/SM Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC® Harvard RISC |
| Program Memory Type | OTP (One-Time-Programmable) EPROM |
| Program Memory Size | 1.5 KB (1K x 12 words) |
| RAM Size | 41 bytes |
| Maximum CPU Speed | 4 MHz |
| Instruction Set | 33 single-word instructions, 12-bit instruction width |
| Supply Voltage (Vdd) | 2.5 V to 5.5 V |
| I/O Pins | 6 (5 bidirectional GPIO + 1 input-only) |
| Timers | 1 x 8-bit (TMR0) + Watchdog Timer (WDT) |
| Oscillator | Internal 4 MHz RC (no external crystal) |
| Peripherals | POR (Power-On Reset), WDT |
| Operating Temperature | -40 °C to +125 °C (Extended "E" grade) |
| Package | 8-pin SOIJ (SM), 5.30 mm body width, tube packaging |
| Mounting Type | Surface Mount |
| ADC / Comparators / PWM | None (no ADC, no comparators, no PWM on this part) |
| Speed Grade Suffix | -04 (4 MHz internal oscillator) |
PIC12C509-04E/SM Pin Configuration
| Pin 1 | GP5/OSC1/CLKIN — GPIO bit 5 / oscillator input / external clock input |
| Pin 2 | GP4/OSC2/CLKOUT — GPIO bit 4 / oscillator output / clock output |
| Pin 3 | GP3/MCLR/Vpp — GPIO bit 3 (input only) / Master Clear reset / programming voltage input |
| Pin 4 | GP2/T0CKI — GPIO bit 2 / Timer 0 clock input |
| Pin 5 | GP1 — GPIO bit 1 (bidirectional) |
| Pin 6 | GP0 — GPIO bit 0 (bidirectional) |
| Pin 7 | VSS — Ground reference |
| Pin 8 | VDD — Positive supply voltage (2.5 V to 5.5 V) |
Typical Applications
PIC12C509-04E/SM is suitable for 6 applications: Low-Cost Consumer Appliance Controller, Sensor Signal Conditioning / Threshold Detection, LED Lighting Controller / PWM-free LED Driver, Battery-Powered Timer / Pulse Generator, Automotive Aftermarket / 12V Accessory Logic, Industrial Discrete Logic Replacement.
Low-Cost Consumer Appliance Controller
The PIC12C509-04E/SM is well-suited for low-cost consumer appliance controllers (rice cookers, coffee machines, fans, hair dryers) where a small digital-only MCU replaces discrete 555 timers or logic gates. With 1.5 KB OTP and 41 bytes RAM, the part handles basic state machines, button debouncing, and LED driving without the cost overhead of larger PIC16/PIC18 devices. Its internal 4 MHz RC oscillator eliminates the need for an external crystal, reducing BOM cost and PCB area. Operating from 2.5 V to 5.5 V at -40 °C to +125 °C, the device tolerates both 3.3 V and 5 V rails and survives harsh kitchen environments.
Recommended
Sensor Signal Conditioning / Threshold Detection
The PIC12C509-04E/SM can perform simple sensor threshold detection and conditioning for thermistors, photoresistors, reed switches, and Hall-effect sensors. With one 8-bit timer (TMR0) plus WDT, the MCU can implement debounce and timing logic without external components. The 6 I/O pins drive indicator LEDs, control relays, or feed upstream microcontrollers. The extended temperature range (-40 °C to +125 °C) and 2.5 V to 5.5 V supply permit battery-powered or 24 V industrial-rail operation after a small regulator.
Recommended
LED Lighting Controller / PWM-free LED Driver
For non-dimmable or simple on/off LED lighting controllers (sign lighting, indicator strips, decorative lamps), the PIC12C509-04E/SM offers a low-cost digital control path. Without an on-chip PWM, brightness control is done via timer-based software bit-banging or simple on/off patterns. The 6 I/O pins can drive multiple LED channels through external transistors. At 5 V supply with internal 4 MHz oscillator, the MCU consumes very low quiescent current, ideal for mains-powered LED fixtures. The SOIJ-8 surface-mount package suits compact PCB designs.
Recommended
Battery-Powered Timer / Pulse Generator
In battery-powered timer applications (1 Hz pulse generation, watchdog kickers, sleep-mode timers for larger systems), the PIC12C509-04E/SM delivers reliable timing with its internal 4 MHz RC oscillator and 8-bit TMR0. The PIC12 series is known for very low sleep current (microamp range) and runs on 2.5 V to 5.5 V, allowing direct battery operation (2xAA, CR2032, coin cells). Its small SOIJ-8 footprint fits behind coin-cell battery holders in wearable or remote-sensor form factors, with a Watchdog Timer to recover from software faults.
Recommended
Automotive Aftermarket / 12V Accessory Logic
While not AEC-Q100 qualified, the PIC12C509-04E/SM's -40 °C to +125 °C extended temperature range and 5 V tolerance make it usable in non-safety automotive aftermarket accessories such as LED accent lights, alarm add-ons, and gauge controllers. The MCU runs directly from a 5 V regulator off the 12 V vehicle bus. Its internal POR and WDT provide robust startup and recovery from voltage transients. For OEM safety-critical applications, use a PIC16F or PIC18F MCU with AEC-Q100 qualification instead.
Recommended
Industrial Discrete Logic Replacement
The PIC12C509-04E/SM replaces dozens of 74xx-series TTL/CMOS logic gates with a single programmable device, simplifying inventory and BOM in industrial control boxes. Engineers can implement sequencers, interlocks, delay lines, and signal shapers in firmware with just 1.5 KB of OTP code. The 2.5 V to 5.5 V supply and internal 4 MHz oscillator tolerate 24 V industrial rails after a small buck regulator, and the -40 °C to +125 °C range survives factory-floor conditions. Re-programming is not required once OTP is fused.
Recommended
Recommended Products Summary
Engineering reference data for PIC12C509-04E/SM — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC12C509A-04E/SM | PIC12C509-04/SM | PIC12C509T-04E/SM | PIC12F509-I/SM | PIC12F508-I/SM |
|---|---|---|---|---|---|---|
| Package | 8-pin SOIJ (SM) | 8-pin SOIJ (SM) - same | 8-pin SOIJ (SM) - same | 8-pin SOIJ (SM) - same | 8-pin SOIJ (SM) - same | 8-pin SOIJ (SM) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Type | OTP (1.5 KB) | OTP (1.5 KB) | OTP (1.5 KB) | OTP (1.5 KB) | Flash (1.5 KB) | Flash (768 bytes) |
| Maximum CPU Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| RAM Size | 41 bytes | 41 bytes | 41 bytes | 41 bytes | 41 bytes | 25 bytes |
| Supply Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.0 V to 5.5 V (wider) | 2.0 V to 5.5 V (wider) |
| Operating Temperature | -40 °C to +125 °C (E) | -40 °C to +125 °C (E) | -40 °C to +85 °C (commercial) | -40 °C to +125 °C (E) | -40 °C to +85 °C (industrial) | -40 °C to +85 °C (industrial) |
| I/O Pins | 6 | 6 | 6 | 6 | 6 | 6 |
| Timers | 1 x 8-bit + WDT | 1 x 8-bit + WDT | 1 x 8-bit + WDT | 1 x 8-bit + WDT | 1 x 8-bit + WDT | 1 x 8-bit + WDT |
Key Differentiators
- Extended -40 °C to +125 °C temperature grade in compact SOIJ-8 (vs PIC12C509-04/SM)
- OTP memory for high-volume cost optimization (vs PIC12F509-I/SM)
- 8-pin SOIJ (SM) surface-mount package in tube packaging (vs PIC12C509-04E/P)
Design Notes
Place a 100 nF ceramic decoupling capacitor within 5 mm of the VDD pin (pin 8) and a bulk capacitor (1-10 µF) at the regulator output. The PIC12C509-04E/SM draws very low operating current (typically <1 mA at 4 MHz) but voltage transients during I/O switching can corrupt internal logic without proper decoupling. The internal Power-On Reset (POR) eliminates the need for an external MCLR pull-up in most applications.
OTP memory can be written only ONCE - there is no re-programming path. For development, use the PIC12F509-I/SM Flash equivalent in the same SOIJ-8 footprint; once firmware is finalized, migrate to the PIC12C509-04E/SM OTP version for high-volume production to save unit cost. Programming voltage (Vpp, typically 13.5 V) is applied to pin 3 (GP3/MCLR/Vpp) - do not connect external circuitry to this pin if it must remain usable as GPIO after programming.
The internal 4 MHz RC oscillator is calibrated to ±1% at room temperature but drifts with temperature and Vdd. For timing-critical applications (UART bit-banging, precision interval timing), use the PIC12F509 with its calibrated 4 MHz internal oscillator or add an external 4 MHz crystal on pins 1-2 (crystal mode replaces RC mode). Keep the GP3/MCLR trace short to minimize noise coupling into the reset line.
Compliance Information
Compliance information not explicitly provided in the verified web data. RoHS/REACH compliance should be confirmed on the Microchip product page before use in EU-restricted applications. Not AEC-Q100 qualified - choose a PIC16F/PIC18F automotive-grade MCU for vehicle safety applications.
