PIC12F509-E/MS - 8-Bit 4MHz MCU 1.5KB Flash MSOP-8 | Microchip
MPN: PIC12F509-E/MS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.45 | $1.45 |
| 10 | $1.28 | $12.80 |
| 100 | $1.1 | $110.00 |
| 500 | $0.95 | $475.00 |
| 1,000 | $0.82 | $820.00 |
PIC12F509-E/MS Overview
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, integrating a CPU, program memory, data RAM, and configurable I/O peripherals on one die. Within the broader taxonomy, the PIC12F509 belongs to the Microchip PIC12 baseline family -> PIC microcontroller -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. Baseline PIC12 devices use a RISC architecture with 33 single-word single-cycle instructions, delivering predictable 200 ns instruction execution at 20 MHz (or 1 µs at 4 MHz internal oscillator) and ~2:1 code density over competitive 8-bit MCUs. Microchip recommends the PIC16F15313 as a newer migration device.
Key features include 6 general-purpose digital I/O pins, four oscillator selections (EXTRC, INTRC, XT, LP), a watchdog timer with on-chip RC oscillator, in-circuit serial programming (ICSP), and code protection. The device has 1024 words (1.5 KB) of self-programmable Flash, 41 bytes of SRAM, and an 8-bit timer/counter (TMR0) with 8-bit prescaler. Power-on reset (POR) and device reset timer (DRT) eliminate the need for external reset circuitry.
Typical applications include low-cost consumer appliances, automotive subsystems (sensor interfaces, LED drivers, fans), industrial control logic, battery-powered devices, and remote controls. The 6 I/O pins drive LEDs, read switches, and interface to peripherals such as comparators or external EEPROMs.
When designing with this part, place a 0.1 µF decoupling capacitor adjacent to VDD, observe the in-circuit serial programming (ICSP) pinout (GP1/ICSPCLK, GP0/ICSPDAT, GP3/MCLR̄/VPP), and verify that the chosen oscillator configuration matches the application's timing tolerance. The -E suffix denotes the extended -40 °C to +125 °C operating range.
This page consolidates distributor pricing, drop-in same-package alternatives, and practical design notes not aggregated on the manufacturer datasheet alone.
Drop-in alternatives for PIC12F509-E/MS — 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 PIC12F509-E/MS (same form factor and footprint) — differing in Package, Core Architecture, Internal Oscillator, Timers, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC12F509-I/MS
✅ Drop-In✓ In Stock
$0.51 / Unit
View Datasheet →PIC12F509-E/MC
✅ Drop-In✓ In Stock
$0.5 / Unit
View Datasheet →PIC12F508-E/MS
✅ Drop-In✓ In Stock
$0.5479 / Unit
View Datasheet →PIC12F508-I/MS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC12F509-E/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC12F1840-E/MF
✅ Drop-In✓ In Stock
$0.84 / Unit
View Datasheet →PIC12F509-E/MS Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC |
| CPU Family | PIC® 12F baseline |
| Program Memory Type | Flash |
| Program Memory Size | 1.5 KB (1K x 12 words) |
| Data RAM | 41 bytes |
| Maximum Clock Frequency | 4 MHz (internal oscillator) |
| Instruction Execution Time | 1 µs @ 4 MHz / 200 ns @ 20 MHz |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 6 |
| Operating Temperature | -40 °C to +125 °C (Extended, -E suffix) |
| Package | MSOP-8 (3.00 mm body) |
| Mounting Type | Surface Mount |
| Timers | 1 x 8-bit (TMR0 with 8-bit prescaler) |
| Watchdog Timer | Yes (on-chip RC oscillator) |
| Oscillator Modes | EXTRC, INTRC, XT, LP |
| ICSP | Yes (in-circuit serial programming) |
| RoHS Status | Compliant (lead-free MSOP) |
PIC12F509-E/MS Pin Configuration
| Pin 1 | VDD — Positive power supply (2.0 V to 5.5 V) |
| Pin 2 | GP5/OSC1/CLKIN — Bidirectional GPIO / oscillator input / external clock input |
| Pin 3 | GP4/OSC2/CLKOUT — Bidirectional GPIO / oscillator output / clock output (1/4 of CLKIN) |
| Pin 4 | GP3/MCLR̄/VPP — Input-only GPIO / master clear (active low reset) / ICSP VPP |
| Pin 5 | GP2/T0CKI/INT/COUT — Bidirectional GPIO / TMR0 clock input / external interrupt / comparator output |
| Pin 6 | GP1/ICSPCLK — Bidirectional GPIO / ICSP serial clock |
| Pin 7 | GP0/ICSPDAT — Bidirectional GPIO / ICSP serial data |
| Pin 8 | VSS — Ground reference |
Typical Applications
PIC12F509-E/MS is suitable for 6 applications: Low-Cost Consumer Appliance Control, Automotive Body Electronics, Industrial Sensor Interface Modules, Battery-Powered Remote Controls, Smart Home Sensor Nodes, LED Driver and Lighting Controllers.
Low-Cost Consumer Appliance Control
The PIC12F509-E/MS fits sub-$1 BOM consumer control boards (toaster ovens, coffee machines, hair dryers) because it integrates a 4 MHz internal oscillator, eliminating the external crystal and trimming cap that would otherwise drive cost up. With 1.5 KB Flash and 41 B RAM, the device reads 1-2 switch inputs, drives 4-6 LEDs or relay drivers via GPIO, and runs a state machine in 1 µs instruction cycles. The 2.0 V to 5.5 V VDD range lets the same part run from a single Li-ion cell, two AA cells, or a rectified 5 V rail. Extended -40 °C to +125 °C temperature grading supports under-hood and outdoor appliance housings. Compared to discrete logic, the PIC12F509 cuts BOM by 30-50% and adds field-reprogrammability.
Recommended
Automotive Body Electronics
Inside the cabin, the PIC12F509-E/MS serves as a sensor-interface or LED-driver controller for non-safety-critical loads such as map-light dimmers, ambient lighting, mirror controllers, and door-lock indicator drivers. Its 6 GPIOs and TMR0 with 8-bit prescaler drive PWM-style LED fading or button-debounce timing in software. The Extended -40 °C to +125 °C grade handles under-dash thermal stress. Although AEC-Q100 qualified variants are required for safety-critical ECUs, the PIC12F509-E/MS is a strong fit for comfort-body loads. Its 41 B RAM holds the current state machine, and 1.5 KB Flash accommodates calibration tables and protocol glue.
Recommended
Industrial Sensor Interface Modules
The PIC12F509-E/MS acts as a digital front-end in industrial 4-20 mA loop-powered sensors, photoelectric eyes, and proximity switches where the MCU reads a digital input and produces a buffered output. Its 2.0 V to 5.5 V supply range supports both 3.3 V and 5 V field-bus nodes, and the INTRC oscillator eliminates crystals on vibration-prone machinery. The watchdog timer with on-chip RC oscillator resets the MCU on firmware hang, increasing field reliability. The MSOP-8 footprint fits inside miniature NEMA-4X sensor heads, and the Extended temperature grade handles factory-floor thermal ranges from -40 °C to +125 °C.
Recommended
Battery-Powered Remote Controls
Coin-cell or two-AAA remote controls benefit from the PIC12F509-E/MS's ability to run from 2.0 V minimum, allowing full use of alkaline and lithium coin-cell chemistries without boost regulators. The MCU wakes on a GPIO interrupt (button press), drives an IR LED or 433 MHz transmitter via TMR0 timing, then returns to sleep. The internal 4 MHz RC oscillator wakes in <1 µs, keeping the active-time budget under 50 ms per event and extending battery life to 5+ years. Six GPIO pins accommodate 4-6 buttons plus an LED indicator, and the MSOP-8 package drops into the slim remote-control form factor.
Recommended
Smart Home Sensor Nodes
In Zigbee/Z-Wave/Wi-Fi bridges, the PIC12F509-E/MS operates as a low-cost local controller that reads a push-button, toggle, or PIR motion detector and triggers a parent SoC via UART or GPIO. Its 1.5 KB Flash stores the button-debounce and indicator-LED PWM logic, offloading real-time tasks from the network processor. The 41 B RAM is ample for state variables and the small protocol frame buffer. Combined with a Wi-Fi or BLE module, the PIC12F509 acts as a wake-source controller, keeping the wireless SoC in deep sleep until user interaction is detected, materially reducing idle power.
Recommended
LED Driver and Lighting Controllers
The PIC12F509-E/MS provides software-driven PWM dimming for LED strips, signage, and architectural lighting where a single IC must read a potentiometer or push-button and output a MOSFET gate drive. Its TMR0 with 8-bit prescaler generates 8-bit PWM at a few hundred Hz, sufficient to eliminate visible flicker. The 6 GPIO drive external N-channel MOSFETs directly at logic levels. Extended -40 °C to +125 °C supports outdoor luminaires and commercial troffers, while the 2.0 V to 5.5 V supply range accepts 3.3 V and 5 V LED-driver rails. Compared to dedicated LED-driver ICs, the PIC12F509 offers field-reprogrammable dim curves and DMX-friendly firmware variants.
Recommended
Recommended Products Summary
Engineering reference data for PIC12F509-E/MS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC12F509-I/MS | PIC12F509-E/MC | PIC12F508-E/MS | PIC12F1840-E/MF |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | MSOP-8 | MSOP-8 - same | MSOP-8 (DFN-8 EP equivalent) - same | MSOP-8 - same | MSOP-8 - same |
| Program Flash | 1.5 KB (1K x 12 words) | 1.5 KB | 1.5 KB | 768 B (-49%) | 7 KB (+367%) |
| Data RAM | 41 B | 41 B | 41 B | 25 B (-39%) | 256 B (+524%) |
| Maximum Core Clock | 4 MHz (INTRC) / 20 MHz (external) | 4 MHz / 20 MHz | 4 MHz / 20 MHz | 4 MHz / 20 MHz | 32 MHz internal (+700%) |
| Operating Temperature | -40 to +125 °C (Extended) | -40 to +85 °C (Industrial) | -40 to +125 °C | -40 to +125 °C | -40 to +125 °C |
| Supply Voltage (VDD) | 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 | 1.8 V to 5.5 V |
| I/O Pins | 6 (GP0-GP5) | 6 | 6 | 6 | 6 (with ADC/PWM multiplexed) |
| AEC-Q100 Qualification | No (industrial Extended grade) | No | No | No | No |
Key Differentiators
- Lowest-cost 8-pin PIC Flash MCU with Extended temperature range (vs PIC12F509-I/MS (Industrial grade))
- Same MSOP-8 footprint as PIC12F508 with 2x program memory (vs PIC12F508-E/MS)
- Self-programmable Flash with ICSP for field updates (vs PIC12F509-E/P (PDIP-8 through-hole))
Design Notes
Estimated: Place a 0.1 µF decoupling capacitor as close as physically possible to the VDD pin (pin 1) and the VSS pin (pin 8) of the PIC12F509-E/MS. For VDD rails above 3.0 V or with >50 mA peak loads, add a bulk 1-10 µF tantalum or aluminum-polymer capacitor within 5 mm of the MCU. This mitigates supply transients during ICSP programming and during GPIO heavy-load switching. For battery-powered applications, the PIC12F509's INTRC sleep current is in the µA range - pair it with an MCP1700 LDO for sub-2 µA quiescent consumption.
Reserve the GP1/ICSPCLK (pin 6) and GP0/ICSPDAT (pin 7) traces for in-circuit serial programming - do not load them with long stubs, low-pass filters, or strong pull-downs. Microchip's ICSP specification mandates that the ICSPCLK and ICSPDAT lines reach the programmer with <100 pF total capacitance. Add 4.7 kΩ pull-ups to VDD on both lines if the production board may sit un-programmed for extended periods, since floating ICSPCLK can cause spurious resets on GP3/MCLR̄/VPP.
GP3 is input-only - driving it as an output will not work; configure TRISIO bit 3 as input always. Never tie GP3/MCLR̄/VPP (pin 4) directly to VDD without a 10 kΩ pull-up and a 100 nF cap to ground - MCLR̄ requires the RC filter for clean reset behavior. When migrating from PIC12F508 to PIC12F509-E/MS, verify that code fits the 1.5 KB Flash window and that you are not relying on addresses above 0x2FF. Finally, the CONFIG word must be set explicitly; unprogrammed parts default to internal RC and disabled watchdog.
Estimated: The PIC12F509-E/MS dissipates very low power - typical INTRC active current at 4 MHz and 5 V is <1.5 mA, dropping to <100 nA in sleep. With the MSOP-8 package theta_JA around 200 °C/W, even at 7.5 mW dissipation the junction temperature rises only ~1.5 °C above ambient. No heatsinking or thermal management is required for any practical GPIO-load condition. The Extended -40 °C to +125 °C grade is for ambient thermal stress, not internal self-heating.
Compliance Information
RoHS-compliant lead-free MSOP-8 package per Microchip product page. Industrial/Extended grade only; no AEC-Q100 variant exists in the PIC12F509 family - choose PIC12F615 or similar AEC-Q100 part for automotive safety-critical applications.
