PIC12F609-I/SN - 8-Bit 20MHz 1.75KB Flash MCU | Microchip
MPN: PIC12F609-I/SN ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.79 | $0.79 |
| 10 | $0.71 | $7.10 |
| 100 | $0.64 | $64.00 |
| 500 | $0.57 | $285.00 |
| 1,000 | $0.51 | $510.00 |
| 3,000 | $0.45 | $1,350.00 |
PIC12F609-I/SN Overview
A microcontroller (MCU) is a single-chip computer containing a CPU, non-volatile program memory, working RAM, and peripheral interfaces. The PIC12F609 belongs to the PIC12F family of 8-pin baseline-to-mid-range PIC microcontrollers, sitting in the broader taxonomy: microcontroller -> embedded processor -> semiconductor. It is designed for ultra-low-power standby applications through nanoWatt technology, offering wake-on-change and watchdog timer modes that minimize quiescent draw to microampere levels.
Key features include 1.75KB (1K x 14) self-programmable Flash, six I/O lines with individually selectable weak pull-ups, an 8-bit timer (TMR0) and a 16-bit timer (TMR1), a 10-bit ADC with up to four channels, an enhanced PWM module, and an internal 8MHz oscillator with calibrated accuracy. The on-chip debug circuitry supports in-circuit debugging via two I/O pins, eliminating the need for an expensive emulator.
The PIC12F609 uses a RISC-based PIC core with a 14-bit instruction word and a two-stage pipeline, providing deterministic instruction timing that simplifies real-time control. Its 35 instructions and Harvard architecture give it predictable interrupt latency of approximately 200ns at 20MHz. Internal 8MHz and 31kHz oscillators remove the external crystal cost while still supporting a high-frequency mode for time-critical tasks.
Typical applications include battery-powered sensors, LED drivers, small appliances, fan controllers, and simple logic replacement. The wide 2V to 5.5V range allows direct connection to two AA cells or a single Li-ion cell, while the small SOIC-8 footprint fits into dense PCBs.
When designing with this MCU, allocate pin 4 as the MCLR/VPP reset pin, and reserve GP3 for ICSP programming if in-circuit serial programming is required. Decouple VDD with a 100nF ceramic capacitor placed within 5mm of the pin.
Drop-in alternatives for PIC12F609-I/SN — 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 PIC12F609-I/SN (same form factor and footprint) — differing in Package, ADC, Operating Temperature, Maximum CPU Speed, MSL Level.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC12F609-E/SN
✅ Drop-In✓ In Stock
$0.55 / Unit
View Datasheet →PIC12F615-I/SN
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.52 / Unit
View Datasheet →PIC12F617-I/SN
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.85 / Unit
View Datasheet →PIC12F1840-I/SN
✅ Drop-In✓ In Stock
$0.82 / Unit
View Datasheet →PIC12F519-I/SN
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.54 / Unit
View Datasheet →PIC12F508-I/SN
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.31 / Unit
View Datasheet →PIC12F609-I/SN Maximum Ratings & Electrical Characteristics
| Core Processor | PIC |
| Core Size | 8-Bit |
| Max CPU Speed | 20 MHz |
| Program Memory Size | 1.75 KB (1K x 14) Flash |
| RAM Size | 64 bytes |
| EEPROM Size | 0 bytes |
| Number of I/O Pins | 6 |
| Supply Voltage (Vdd) | 2 V to 5.5 V |
| Operating Temperature | -40 C to +85 C (Industrial, -I) |
| Package | 8-SOIC (SN) 3.90 mm |
| Mounting Type | Surface Mount |
| Oscillator Type | Internal 8 MHz |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Connectivity | One-wire (ICSP) |
| MSL Level | 1 (Unlimited) |
| Lead-Free / RoHS | Lead-Free / RoHS Compliant |
| Instruction Set | PIC16 mid-range (14-bit, 35 instructions) |
PIC12F609-I/SN Pin Configuration
| Pin 1 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
| Pin 2 | GP5/T1CKI/OSC1 — General-purpose I/O / Timer1 clock input / oscillator input |
| Pin 3 | GP4/AN3/OSC2/CLKOUT — General-purpose I/O / analog channel 3 / oscillator output / CLKOUT |
| Pin 4 | GP3/MCLR/VPP — General-purpose I/O / Master Clear reset (active low) / programming voltage |
| Pin 5 | GP2/CCP1 — General-purpose I/O / Capture-Compare-PWM output |
| Pin 6 | GP1/AN1 — General-purpose I/O / analog channel 1 |
| Pin 7 | GP0/AN0/CIN+/ICSPDAT — General-purpose I/O / analog channel 0 / comparator input / ICSP data |
| Pin 8 | VSS — Ground reference |
Typical Applications
PIC12F609-I/SN is suitable for 7 applications: Battery-Powered Sensor Interface, LED Driver and PWM Dimmer, Small Appliance Controller, Logic Replacement / Glue Logic, Capacitive Touch Button Interface, Industrial Fan and Pump Controller, Security and Alarm Sensors.
Battery-Powered Sensor Interface
The PIC12F609-I/SN suits battery-powered sensor interface designs because it operates from 2.0V to 5.5V and supports nanoWatt-class sleep currents well below 1 microamp. Its 6 GPIO pins are sufficient to read a digital temperature or humidity sensor, drive an indicator LED, and handle a wake-up pushbutton via interrupt-on-change. The 1.75KB Flash holds typical sensor conditioning state machines, and the internal 8MHz oscillator eliminates an external crystal to save both cost and quiescent draw. Estimated battery life on two AA cells with 0.1% duty cycle exceeds three years.
Recommended
LED Driver and PWM Dimmer
The PIC12F609-I/SN integrates an enhanced CCP/PWM module that generates precise PWM waveforms for LED dimming and color mixing. With a 20MHz CPU clock, PWM frequency can be set above 20kHz to avoid audible whine in lamp fixtures. The 6 I/O pins support RGB LED control plus a button input for user adjustment, and the wide 2-5.5V supply range accepts direct drive from USB or battery sources. The internal oscillator eliminates component count, and Flash-based firmware allows custom dimming curves to be programmed without external EEPROM.
Recommended
Small Appliance Controller
The PIC12F609-I/SN is ideal for small appliance controllers such as fans, toasters, and kitchen timers due to its compact 8-SOIC footprint, -40C to +85C industrial temperature grade, and 5.5V tolerance for direct connection to rectified mains adapters. The 1.75KB Flash holds motor start/stop state machines and timing routines, while the 6 I/O pins drive relays, sense buttons, and read a tachometer or thermistor. The integrated brown-out reset prevents undefined behavior during brown-line events, improving appliance safety.
Recommended
Logic Replacement / Glue Logic
The PIC12F609-I/SN replaces discrete CMOS glue logic by combining multiple gates, flip-flops, and timers in a single 8-pin package at lower cost than 74HC-series ICs. Engineers can encode a custom state machine in 1.75KB Flash and adjust timing or polarity in firmware rather than through hardware rework. The 20MHz instruction rate handles multi-MHz logic tasks, and the 6 I/O pins map directly to most small glue-logic functions such as debouncing, signal conditioning, and pulse generation.
Recommended
Capacitive Touch Button Interface
The PIC12F609-I/SN supports basic capacitive touch sensing through the GP0/CIN+ pin when paired with a software charge-time measurement routine. With 1.75KB Flash, a touch library fits comfortably, and the 6 GPIO count allows multiple buttons plus an LED indicator in a single chip. The industrial temperature grade and 2V-5.5V supply suit consumer and industrial touch panels. For higher pin counts or mTouch hardware support, PIC12F1840 is the upgrade path.
Recommended
Industrial Fan and Pump Controller
The PIC12F609-I/SN fits industrial fan and small pump controllers that require a -40C to +85C temperature range and PWM speed control. The 1.75KB Flash holds proportional control loops, while the 6 I/O pins interface with tachometer feedback, a speed-set potentiometer, and a relay output. The internal 8MHz oscillator and BOR circuitry support reliable operation in electrically noisy industrial environments, and the small SOIC-8 footprint simplifies assembly onto compact fan PCBs. Estimated: at 5V supply with PWM switching 10kHz, average current draw stays under 5mA.
Recommended
Security and Alarm Sensors
The PIC12F609-I/SN operates as a low-cost alarm sensor node, reading a PIR or reed-switch input and driving a buzzer or relay output. Its nanoWatt sleep modes extend battery life in wireless sensors, and the 1.75KB Flash fits encryption-free LoRaWAN or simple proprietary RF protocols when paired with a transmitter module. The wide supply range accepts 3V coin cells or 5V wall adapters, and the industrial temperature grade supports outdoor enclosures. Six I/O pins support reed, PIR, button, status LED, buzzer, and alarm output simultaneously.
Recommended
Recommended Products Summary
Engineering reference data for PIC12F609-I/SN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC12F609-E/SN | PIC12F615-I/SN | PIC12F617-I/SN | PIC12F1840-I/SN | PIC12F519-I/SN | PIC12F508-I/SN |
|---|---|---|---|---|---|---|---|
| Package | 8-SOIC (SN) | 8-SOIC (SN) - same | 8-SOIC (SN) - same | 8-SOIC (SN) - same | 8-SOIC (SN) - same | 8-SOIC (SN) - same | 8-SOIC (SN) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | PIC 8-bit | PIC 8-bit | PIC 8-bit | PIC 8-bit | PIC 8-bit (enhanced mid-range) | PIC 8-bit | PIC 8-bit |
| Max CPU Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 32 MHz | 8 MHz | 4 MHz |
| Program Memory (Flash) | 1.75 KB | 1.75 KB | 1.75 KB | 2 KB | 7 KB | 1.5 KB | 0.5 KB |
| RAM | 64 B | 64 B | 64 B | 128 B | 256 B | 41 B | 25 B |
| I/O Pins | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| 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 | 1.8 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 (I) | -40 C to +125 C (E) | -40 C to +85 C (I) | -40 C to +85 C (I) | -40 C to +85 C (I) | -40 C to +85 C (I) | -40 C to +85 C (I) |
Key Differentiators
- Lowest-cost 8-bit PIC with internal oscillator and 1.75KB Flash (vs PIC12F508-I/SN)
- Industrial temperature grade with full 20MHz operation (vs PIC12F519-I/SN)
- Direct upgrade path to enhanced mid-range PIC12F1840 (vs PIC12F1840-I/SN)
- Extended-temperature drop-in variant available (vs PIC12F609-E/SN)
Design Notes
Place a 100nF ceramic decoupling capacitor within 5mm of the VDD pin (pin 1) with the ground return directly to VSS (pin 8) via a short, wide trace. For noisy supplies such as rectified mains, add a 10uF bulk capacitor in parallel. The PIC12F609 nanoWatt sleep mode can drop quiescent current to under 1 microampere, but watch the MCLR pull-up current path - tie MCLR high through a 10k resistor to avoid leakage during sleep.
Reserve GP3 (pin 4) as the MCLR/VPP pin so that in-circuit serial programming (ICSP) is possible without hardware rework. Connect MCLR to VDD through a 10k resistor and place a 100nF capacitor close to the pin for noise immunity. For 2-layer boards, flood the bottom layer with ground copper beneath the MCU to provide a low-impedance return path for switching currents.
Do not leave unused I/O pins floating. Configure them as outputs with a defined level, or as inputs with the weak pull-up enabled, to avoid excess current draw in sleep mode. The internal 8MHz oscillator accuracy is typically +/- 2% over voltage and temperature - adequate for UART only at low baud rates; use the PLL or an external crystal for precise timing. When migrating code from PIC12F508/509, note that the PIC12F609 has a different SFR layout and interrupt vector assignments.
Keep ICSP programming traces (ICSPCLK on pin 6, ICSPDAT on pin 7) short and free of nearby high-speed signals to avoid programming failures. If the design uses an external oscillator on OSC1/OSC2, place the crystal or resonator within 5mm of pins 2 and 3 with grounded copper guard rings. For PWM-driven outputs on GP2/CCP1, route the trace away from analog inputs to minimize crosstalk.
Compliance Information
Lead-free and RoHS compliant per Microchip product page. Not AEC-Q100 qualified - automotive applications should use PIC12F609-E/SN (extended temp) or AEC-Q100 qualified PIC variants.
