PIC12F609-E/SN - 8-Bit 20MHz 1.75KB Flash MCU | Microchip | SOIC-8
MPN: PIC12F609-E/SN ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.94 | $0.94 |
| 10 | $0.89 | $8.90 |
| 100 | $0.82 | $82.00 |
| 500 | $0.74 | $370.00 |
| 1,000 | $0.66 | $660.00 |
| 3,000 | $0.55 | $1,650.00 |
PIC12F609-E/SN Overview
A mid-range 8-bit microcontroller (MCU) is a single-chip computer integrating a CPU, non-volatile program memory, working RAM, and configurable I/O peripherals onto one silicon die. Within the broader taxonomy, an 8-bit MCU sits inside the microcontroller family, which itself falls under microcontrollers and processors, then embedded computing, then semiconductors. The PIC12F609 specifically uses Microchip's PIC RISC architecture, executing most instructions in a single 200 ns cycle at 20 MHz, supported by only 35 single-word instructions. This combination of small footprint, easy programmability, and predictable timing is why 8-bit mid-range MCUs remain popular for simple control loops and glue logic.
Key features of the PIC12F609 include 6 general-purpose digital I/O pins (with multiplexed analog and comparator functions), a 4-channel 10-bit ADC, two analog comparators with a fixed voltage reference, an enhanced universal synchronous/asynchronous receiver-transmitter (EUSART) module, brown-out reset (BOR) and power-on reset (POR), an 8 MHz internal oscillator (calibrated to ±1 %), and nanoWatt power management that drops quiescent current to the sub-microamp range during sleep. The -E temperature grade specifies an operating range of -40 °C to +125 °C, which is broader than the -I grade and suitable for industrial and outdoor enclosures.
Typical applications include consumer remote controls, sensor signal conditioning front-ends, white-goods and small-appliance controllers, LED lighting drivers, low-end battery chargers, and HVAC auxiliary boards. With 6 I/O, a built-in comparator, and an EUSART, designers often use the PIC12F609 to replace discrete logic or older 8-pin legacy microcontrollers, consolidating several discrete functions into a single programmable device.
When designing with this part, place a 0.1 µF decoupling capacitor as close as possible to VDD, configure the internal oscillator calibration register during initialization to maximize timing accuracy, and respect the 5.5 V absolute maximum supply rating. For low-power battery applications, leverage the nanoWatt sleep modes and gate the EUSART and ADC off when idle to extend battery life.
Drop-in alternatives for PIC12F609-E/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-E/SN (same form factor and footprint) — differing in Package, Internal Oscillator, ADC, Comparators, Data EEPROM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC12F609-I/SN
✅ Drop-In✓ In Stock
$0.45 / Unit
View Datasheet →PIC12F609-E/P
✅ Drop-In✓ In Stock
$0.78 / Unit
View Datasheet →PIC12F609-E/MS
✅ Drop-In✓ In Stock
$0.59 / Unit
View Datasheet →PIC12F609-E/MD
✅ Drop-In✓ In Stock
$0.66 / Unit
View Datasheet →PIC12F615-E/SN
✅ Drop-In✓ In Stock
$0.84 / Unit
View Datasheet →PIC12F609-E/SN Maximum Ratings & Electrical Characteristics
| Manufacturer | Microchip Technology |
| Series | PIC12F609 |
| Core Processor | PIC |
| Core Size | 8-bit |
| Speed (Max) | 20 MHz |
| Program Memory Size | 1.75 KB (1K x 14) Flash |
| RAM | 64 bytes |
| Data EEPROM | 0 bytes (not present on this family) |
| Number of I/O | 6 |
| ADC | 4-channel x 10-bit |
| Comparators | 2 analog comparators with programmable reference |
| Communication Module | 1 x EUSART |
| Timers | 1 x 8-bit, 1 x 16-bit |
| Internal Oscillator | 8 MHz (calibrated ±1%), with 31 kHz LF oscillator |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| Operating Temperature | -40 °C to +125 °C (-E grade) |
| Package | 8-SOIC (SN), 0.154" / 3.90 mm body width |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited floor life) |
| RoHS Status | Compliant |
| Lead-Free / Halogen-Free | Lead-free finish; halogen-free status per Microchip product page |
PIC12F609-E/SN Pin Configuration
| Pin 1 | VDD — Positive power supply input (2.0 V to 5.5 V) |
| Pin 2 | GP5/T1CKI/OSC1/CLKIN — GPIO5 / Timer1 clock input / crystal oscillator input / external clock input |
| Pin 3 | GP4/AN3/T1G/OSC2/CLKOUT — GPIO4 / ADC channel 3 / Timer1 gate / crystal oscillator output / clock output |
| Pin 4 | GP3/MCLR/VPP — GPIO3 / Master Clear (reset) input / programming voltage input |
| Pin 5 | GP2/AN2/T0CKI/INT/COUT — GPIO2 / ADC channel 2 / Timer0 clock input / external interrupt / comparator output |
| Pin 6 | GP1/AN1/CIN-/ICSPCLK — GPIO1 / ADC channel 1 / comparator inverting input / ICSP clock |
| Pin 7 | GP0/AN0/CIN+/ICSPDAT — GPIO0 / ADC channel 0 / comparator non-inverting input / ICSP data |
| Pin 8 | VSS — Ground reference |
Typical Applications
PIC12F609-E/SN is suitable for 6 applications: Consumer Remote Control and IR Transmitter, Industrial Sensor Signal Conditioning Front-End, White Goods and Small Appliance Controllers, LED Lighting Driver and Dimming Controller, Battery Charger for Single-Cell Li-Ion / NiMH Packs, HVAC Auxiliary and Thermostat Board.
Consumer Remote Control and IR Transmitter
The PIC12F609-E/SN's 6 I/O pins, single EUSART, and 20 MHz core make it well-suited for IR remote control transmitters where timing-accurate carrier generation (typically 38 kHz) is essential. With 64 bytes of RAM, the MCU comfortably handles protocol state machines such as NEC, RC5, and SIRC while leaving headroom for low-battery detection via the analog comparator. Its 2.0 V minimum supply means it can run from a single CR2032 coin cell for years. The wide -40 °C to +125 °C operating range ensures the device survives being left on a sunny dashboard or in a cold garage. For cost-driven consumer remotes, designers often disable the ADC entirely and dedicate 4 I/O lines to a single 4x4 matrix scan plus one EUSART TX for IR modulation.
Recommended
Industrial Sensor Signal Conditioning Front-End
The PIC12F609-E/SN integrates a 4-channel 10-bit ADC and two analog comparators with a programmable voltage reference, making it an ideal front-end for analog sensor conditioning in industrial environments. Engineers can digitize up to four thermistor, RTD, or 4-20 mA-derived voltages and apply linearization in firmware without external op-amps. The E grade -40 °C to +125 °C range covers outdoor enclosures and under-hood mounting, while the 5.5 V VDD tolerance simplifies powering from 5 V industrial rails. The 64 bytes RAM suffices for moving-average filtering and threshold hysteresis but not for full PID control, so the PIC12F609 is typically paired with a downstream controller for closed-loop systems.
Recommended
White Goods and Small Appliance Controllers
Small appliances such as coffee makers, blenders, toasters, and air purifiers need a low-cost MCU to drive relays, read buttons, time cycles, and provide safety interlocks - exactly the use case the PIC12F609-E/SN addresses. Its 6 I/O lines can be split into 3 outputs for relay/TRIAC drivers and 3 inputs for membrane switches and door sensors, with the EUSART reserved for factory calibration or fault-log download. The 20 MHz core delivers 5 MIPS, easily handling capacitive-touch sensing via software and 50/60 Hz zero-cross detection. The extended -40 °C to +125 °C temperature grade handles under-cabinet heat and freezer exposure for refrigerator accessories.
Recommended
LED Lighting Driver and Dimming Controller
The PIC12F609-E/SN can serve as the brain of low-cost constant-current LED drivers, particularly in architectural and accent lighting where individual addressability is not required. The MCU uses the analog comparators to regulate current through a sense resistor in a buck topology, while a 16-bit timer generates PWM for dimming at up to 20 kHz - above the audible band and free of flicker. Its 8 MHz calibrated internal oscillator removes the cost of an external crystal while keeping timing within 1%. With 64 bytes of RAM the PIC12F609 can store dimming curves, fade profiles, and DMX-style address bytes for sub-$5 fixture designs.
Recommended
Battery Charger for Single-Cell Li-Ion / NiMH Packs
Charging single-cell Li-Ion or NiMH battery packs demands accurate voltage and current monitoring plus a state machine for CC/CV transitions - a perfect fit for the PIC12F609-E/SN's ADC and comparator mix. The 10-bit ADC reads battery voltage and charge current with adequate resolution for ±1 % termination accuracy, while the two analog comparators handle instantaneous over-current and over-voltage protection independent of firmware latency. The 2.0 V minimum VDD allows the device to operate directly from a single Li-Ion cell down to depletion. nanoWatt sleep drops quiescent current under 1 µA when the charger is idle, which is critical for always-on wall-wart designs.
Recommended
HVAC Auxiliary and Thermostat Board
Auxiliary HVAC boards such as damper controllers, condensate pump monitors, and remote temperature sensors often have only 6 I/O available and live in harsh environments - both constraints fit the PIC12F609-E/SN. The MCU reads 10 kΩ thermistors through the 10-bit ADC and switches 24 VAC damper actuators via opto-isolated TRIAC outputs. The -40 °C to +125 °C operating range handles attic and rooftop installations where temperatures swing through 60 °C daily. The EUSART is invaluable for Modbus RTU communication with the main HVAC controller, and the calibrated ±1 % internal oscillator saves the cost and footprint of an external crystal in a sealed unit.
Recommended
Recommended Products Summary
Engineering reference data for PIC12F609-E/SN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC12F609-I/SN | PIC12F609-E/P | PIC12F609-E/MS | PIC12F609-E/MD | PIC12F615-E/SN |
|---|---|---|---|---|---|---|
| Package | 8-SOIC (SN) | 8-SOIC (SN) - same | 8-PDIP - through-hole | 8-MSOP - smaller | 8-DFN - smallest | 8-SOIC (SN) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Temperature Grade | -40 °C to +125 °C (E) | -40 °C to +85 °C (I) | -40 °C to +125 °C (E) | -40 °C to +125 °C (E) | -40 °C to +125 °C (E) | -40 °C to +125 °C (E) |
| Flash Memory | 1.75 KB (1024 x 14) | 1.75 KB | 1.75 KB | 1.75 KB | 1.75 KB | 2 KB (+14%) |
| RAM | 64 bytes | 64 bytes | 64 bytes | 64 bytes | 64 bytes | 128 bytes (+100%) |
| Core Speed | 20 MHz / 5 MIPS | 20 MHz / 5 MIPS | 20 MHz / 5 MIPS | 20 MHz / 5 MIPS | 20 MHz / 5 MIPS | 20 MHz / 5 MIPS |
| I/O Pins | 6 | 6 | 6 | 6 | 6 | 6 |
| ADC Channels | 4 x 10-bit | 4 x 10-bit | 4 x 10-bit | 4 x 10-bit | 4 x 10-bit | 4 x 10-bit |
| Unit Price (qty 1000, USD) | $0.66 | $0.55 (typ) | $0.70 (typ) | $0.72 (typ) | $0.78 (typ) | $0.80 (typ) |
Key Differentiators
- 8-pin flash-based 8-bit MCU with extended -E temperature grade (vs PIC12F509-I/SN)
- Same-die package options for thermal and assembly flexibility (vs PIC12F609-E/SN (SOIC-8) vs PIC12F609-E/MS (MSOP-8))
- Pin-compatible upgrade path to PIC12F615 (vs PIC12F615-E/SN)
Design Notes
Place a 0.1 µF decoupling capacitor within 5 mm of the VDD pin and a bulk 1-10 µF electrolytic or tantalum on the same rail if the device is more than 30 mm from the regulator. The PIC12F609-E/SN draws 1-3 mA when active at 20 MHz and drops to under 1 µA in sleep, so the bulk cap must be sized to handle the inrush of waking peripheral modules (especially the ADC and EUSART). Estimated worst-case inrush on wake: ~2 mA for 50 µs, which a 1 µF X7R cap easily absorbs with <100 mV ripple. For battery applications, gate the brown-out reset threshold (BOR) to a low-voltage value such as 2.0 V to maximize usable capacity while protecting against flash corruption.
Three pitfalls to avoid: (1) The MCLR/GP3 pin (pin 4) is the only reset input and must be pulled high through a 10 kΩ resistor; leaving it floating can cause spurious resets from EMI. (2) The internal 8 MHz oscillator is calibrated at 3.3 V, 25 °C and drifts ±1 % over voltage and ±2 % over temperature - use the LFINTOSC (31 kHz) for timing-critical applications or add a 4 MHz-20 MHz crystal between OSC1/OSC2 if UART accuracy must beat 0.5 %. (3) The flash memory has an endurance of 100K erase/write cycles per block - do not use self-write routines inside high-frequency interrupt loops or you will wear out the program memory in days.
The PIC12F609-E/SN is rated -40 °C to +125 °C ambient, but actual junction temperature must be kept under 150 °C. The 8-SOIC package has θJA around 100 °C/W in still air on a 1 oz. 1 square inch copper pour, so a 1 W dissipation causes a 100 °C rise - derate carefully in sealed enclosures. For -E grade automotive and outdoor applications, design with a 25 °C margin below +125 °C ambient to absorb solar gain. Power consumption scales linearly with oscillator frequency (P ≈ 1.5 mA × f(MHz) / 4), so reducing the core to 4 MHz at 1 MIPS cuts quiescent current by ~80 %.
For best noise immunity on the analog comparator and ADC inputs, route GP0/GP1 (analog) traces away from the EUSART TX line and any PWM output. Ground the exposed pad (none on SOIC-8) and use a star-ground topology where VSS returns directly to the regulator rather than daisy-chained through other ICs. For ICSP programming, keep the ICSPCLK and ICSPDAT traces short (<50 mm) and avoid running them parallel to noise sources. Adding a 5.1 V TVS diode such as PESD5V0S1BA on VDD protects against ESD events during handling and field deployment, especially for outdoor and automotive designs.
Compliance Information
RoHS and REACH compliant per Microchip product page; lead-free matte-tin finish; halogen-free per Microchip 2013 declaration. Not AEC-Q100 qualified - automotive customers should select PIC12F609-E/SN for non-safety-critical auxiliary modules.
