PIC16F1709-I/SO - 8-bit 32MHz 14KB Flash MCU | Microchip
MPN: PIC16F1709-I/SO β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.3 | $2.30 |
| 10 | $2.07 | $20.70 |
| 100 | $1.84 | $184.00 |
| 500 | $1.61 | $805.00 |
| 1,000 | $1.38 | $1,380.00 |
PIC16F1709-I/SO Overview
An 8-bit flash microcontroller is a single-chip computer built around an 8-bit data path and on-chip non-volatile program memory. Within the broader taxonomy, PIC16F1709 sits inside Microchip's mid-range PIC16 family, which itself belongs to the 8-bit MCU category, then microcontrollers, then integrated circuits. The mid-range core delivers 200 ns instruction execution at 32 MHz, with a 14-bit instruction word and a hardware stack - the architectural sweet spot for cost-sensitive embedded control that still needs analog integration and deterministic interrupt response.
Key features include 1024 bytes of SRAM, 256 bytes of EEPROM, up to 18 I/O pins, a 10-bit ADC with up to 12 channels, two 8-bit DACs, two comparators, and up to two on-chip operational amplifiers. The PIC16F1709 also offers a UART, two SPI/I2C, eight PWM channels, and a 32 MHz internal oscillator that eliminates the need for an external crystal in many designs.
Typical applications include LED lighting controllers, sensor conditioning front-ends, battery chargers, small appliance controls, consumer white goods, IoT endpoints, and low-cost general-purpose analog signal conditioning. The on-chip op-amps and DACs make the PIC16F1709 well-suited to analog-front-end designs where a discrete op-amp and an MCU would otherwise consume board space and budget.
When designing with this MCU, engineers should note that the on-chip peripherals are mapped via PPS, which simplifies PCB layout but requires the latest MPLAB X configuration. The PIC16F1709 runs from 1.8 V to 5.5 V; for a true low-voltage variant, Microchip offers the PIC16LF1709 with the same die and pinout. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC16F1709-I/SO β 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 PIC16F1709-I/SO (same form factor and footprint) β differing in ADC, I/O Pins, MSL Level, Data EEPROM, Package.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16F1709-I/SP
β Drop-Inπ Reference alternative (not in catalog)
PIC16LF1709-I/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16F1708-I/SO
β Drop-Inβ In Stock
$0.92 / Unit
View Datasheet βPIC16F1718-I/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16F1509-I/SO
β Drop-Inβ In Stock
$1.34 / Unit
View Datasheet βPIC16F1709-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16 enhanced mid-range (8-bit, 14-bit instruction word) |
| Program Memory (Flash) | 14 KB (8K x 14 words) |
| Data SRAM | 1024 bytes |
| Data EEPROM | 256 bytes |
| Maximum CPU Frequency | 32 MHz (200 ns instruction cycle) |
| Supply Voltage (VDD) | 1.8 V to 5.5 V |
| Operating Temperature | -40C to +85C (Industrial, -I grade) |
| I/O Pins | Up to 18 |
| ADC | 10-bit, up to 12 channels |
| DAC | 2 x 8-bit |
| Comparators | 2 |
| Op-Amps | Up to 2 on-chip |
| PWM Outputs | Up to 8 channels |
| Communication | 1 x UART, 2 x SPI/I2C |
| Core-Independent Peripherals | CLC, COG, Zero Cross Detect, PPS |
| Timers | Multiple 8/16-bit timers |
| Package | 20-pin SOIC (SO) |
| Mounting Type | Surface Mount |
| MSL Level | 1 |
| RoHS Status | Compliant |
| AEC-Q100 | Not qualified (industrial grade) |
PIC16F1709-I/SO Pin Configuration
| Pin 1 | RA3/AN3/C1IN+/C2IN+/VREF+ β PORTA bit 3 / Analog input 3 / Comparator input |
| Pin 2 | RA4/AN4/C1OUT/T1G/SDO β PORTA bit 4 / Analog input 4 / Comparator 1 output / SPI data out |
| Pin 3 | RA5/MCLR/VPP/AN5/OPA1IN+ β PORTA bit 5 / Master Clear (reset) / Programming voltage / OPA1 positive input |
| Pin 4 | RA6/OSC2/CLKOUT/OPA1OUT β PORTA bit 6 / Crystal oscillator output / Clock output / OPA1 output |
| Pin 5 | RA7/OSC1/CLKIN/OPA2IN+ β PORTA bit 7 / Crystal oscillator input / External clock input / OPA2 positive input |
| Pin 6 | VSS β Ground reference |
| Pin 7 | VDD β Positive supply voltage (1.8 V to 5.5 V) |
| Pin 8 | RB0/AN12/OPA1IN-/SDI/SDA β PORTB bit 0 / Analog input 12 / OPA1 negative input / SPI data in / I2C data |
| Pin 9 | RB1/AN10/OPA2OUT/SCK/SCL β PORTB bit 1 / Analog input 10 / OPA2 output / SPI clock / I2C clock |
| Pin 10 | RB2/AN8/OPA2IN-/PWM3 β PORTB bit 2 / Analog input 8 / OPA2 negative input / PWM output 3 |
| Pin 11 | RB3/AN9/C2OUT/PWM4 β PORTB bit 3 / Analog input 9 / Comparator 2 output / PWM output 4 |
| Pin 12 | RB4/AN11/SDA/SDI/PWM5 β PORTB bit 4 / Analog input 11 / I2C data / SPI data in / PWM output 5 |
| Pin 13 | RB5/AN13/TX/CK/PWM6 β PORTB bit 5 / Analog input 13 / UART TX / PWM output 6 |
| Pin 14 | RB6/ICSPCLK/ICDCLK/PGC β PORTB bit 6 / In-Circuit Serial Programming clock / Debug clock |
| Pin 15 | RB7/ICSPDAT/ICDDAT/PGD β PORTB bit 7 / In-Circuit Serial Programming data / Debug data |
| Pin 16 | RC0/SOSCO/AN16/PWM2 β PORTC bit 0 / Secondary oscillator output / Analog input 16 / PWM output 2 |
| Pin 17 | RC1/SOSCI/AN17/PWM1 β PORTC bit 1 / Secondary oscillator input / Analog input 17 / PWM output 1 |
| Pin 18 | RC2/AN14/CCP1 β PORTC bit 2 / Analog input 14 / Capture/Compare/PWM 1 |
| Pin 19 | RC3/AN15/SS/CCP2 β PORTC bit 3 / Analog input 15 / SPI slave select / Capture/Compare/PWM 2 |
| Pin 20 | RC4/RX/DT/C2IN- β PORTC bit 4 / UART RX / Comparator 2 negative input |
Typical Applications
PIC16F1709-I/SO is suitable for 7 applications: Sensor Signal Conditioning Front-End, LED Lighting Controllers, Battery Chargers and Power Management, Small Appliance Control, IoT Endpoint Nodes, Industrial Sensor Transmitters, Consumer White Goods and HVAC Controls.
Sensor Signal Conditioning Front-End
The PIC16F1709-I/SO is exceptionally well-suited for transducer signal conditioning because it integrates up to 2 on-chip operational amplifiers alongside 2 8-bit DACs, 2 comparators, and a 10-bit ADC with 12 channels - all in a single 20-SOIC package. The op-amps support inverting, non-inverting, and transimpedance amplifier topologies with firmware-selectable gain, eliminating the need for 1-2 external op-amp ICs and reducing BOM cost and PCB area. For thermocouple or strain-gauge conditioning, the 10-bit ADC provides adequate resolution while the integrated op-amp drives the sensor bridge or provides cold-junction compensation. Designers can use the DACs to generate sensor excitation bias voltages, and the XLP sleep current under 1 uA enables battery-powered wireless sensor nodes that sample infrequently.
Recommended
LED Lighting Controllers
The PIC16F1709-I/SO drives multi-channel LED lighting systems using its 8 PWM channels, on-chip comparators for current sensing, and Zero Cross Detect for AC-line dimming. The COG (Complementary Output Generator) produces hardware-based dead-band control for half-bridge LED drivers without software overhead, freeing the CPU for color-mixing algorithms. Operating from 1.8-5.5 V, the part accepts direct power from a single-cell Li-ion battery for portable fixtures or a 3.3 V/5 V rail for mains-connected drivers. The integrated op-amps amplify current-sense shunt signals, while the DACs set LED current reference levels for analog dimming. Industrial temperature range -40C to +85C supports outdoor and architectural lighting deployments.
Recommended
Battery Chargers and Power Management
The PIC16F1709-I/SO functions as the controller in single or multi-cell Li-ion, NiMH, or lead-acid battery chargers thanks to its 10-bit ADC for voltage/current monitoring, on-chip comparators for over-current protection, and DACs for reference voltage generation. The CLC (Configurable Logic Cell) implements hardware-based charge-state sequencing without CPU intervention, allowing the core to sleep and wake on interrupt - critical for energy-efficient charger designs. The 1.8-5.5 V operating range supports direct connection to 1S Li-ion packs, while op-amps amplify sense-resistor signals for accurate coulomb counting. UART enables host communication for state-of-charge reporting in UPS or solar charge controller applications.
Recommended
Small Appliance Control
The PIC16F1709-I/SO is widely deployed in small household appliances such as coffee makers, blenders, humidifiers, and rice cookers where it integrates user-interface control, motor drive PWM, and sensor feedback in a single 20-SOIC MCU. The 32 MHz CPU speed handles LCD or LED display refresh, button debouncing, and PID control loops simultaneously. Op-amps condition NTC thermistor inputs for temperature regulation, while the 8 PWM channels drive TRIAC gates, MOSFET bridges, or buzzer tones. XLP sleep currents under 1 uA extend battery life in cordless appliances. The 20-SOIC package enables low-cost single-sided PCB assembly common in consumer-grade small appliances.
Recommended
IoT Endpoint Nodes
The PIC16F1709-I/SO anchors low-power IoT sensor nodes where its XLP sleep current under 1 uA enables multi-year battery life on a single coin cell. The on-chip op-amps amplify sensor outputs, the 10-bit ADC digitizes them, and the UART/SPI/I2C peripherals connect to wireless modules such as the MRF24XA or external LoRa/BLE transceivers. PPS (Peripheral Pin Select) remaps digital functions to any I/O pin, simplifying PCB layout for compact wearable or smart-sensor form factors. The 32 MHz internal oscillator eliminates the external crystal for low-cost nodes, while the -40C to +85C industrial temperature range supports outdoor deployment. A typical IoT node sleeps at 0.6 uA and wakes briefly to transmit.
Recommended
Industrial Sensor Transmitters
The PIC16F1709-I/SO powers 4-20 mA loop-powered industrial sensor transmitters where its integrated op-amps condition bridge or RTD inputs, its 10-bit ADC digitizes the signal, and its UART outputs the result. The 1.8-5.5 V supply range is compatible with loop-power architectures after a small LDO, while the -40C to +85C industrial temperature grade handles factory-floor environments. CLC cells implement hardware linearization for thermocouple or RTD curves, offloading the CPU. The 8 PWM outputs can drive HART modem chips or analog output DACs for current-loop signaling. The 20-SOIC package fits inside standard industrial sensor heads.
Recommended
Consumer White Goods and HVAC Controls
The PIC16F1709-I/SO serves as the main controller in white goods such as washing machines, dishwashers, and HVAC thermostats where it must simultaneously read temperature sensors, drive motor PWM, control solenoid valves, and manage user interfaces. The 32 MHz CPU runs multiple control loops without scheduling pressure, while the on-chip op-amps amplify NTC/PTC thermistor signals for accurate temperature regulation. Comparators provide over-current protection for motor drivers, and the CLC peripheral implements zero-cross switching for AC load control, reducing EMI. UART enables diagnostic interfaces or connectivity to Wi-Fi modules for smart-appliance retrofit. Industrial temperature range supports under-cabinet or outdoor HVAC installations.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F1709-I/SO β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F1709-I/SP | PIC16LF1709-I/SO | PIC16F1708-I/SO | PIC16F1718-I/SO | PIC16F1509-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-pin SOIC (SO) | 20-pin PDIP - through-hole | 20-pin SOIC - same | 20-pin SOIC - same | 20-pin SOIC - same | 20-pin SOIC - same |
| Flash Memory | 14 KB | 14 KB | 14 KB | 7 KB | 28 KB | 8 KB |
| SRAM | 1024 bytes | 1024 bytes | 1024 bytes | 512 bytes | 2048 bytes | 512 bytes |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Max CPU Frequency | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 20 MHz |
| On-Chip Op-Amps | Up to 2 | Up to 2 | Up to 2 | Up to 2 | 0 | 0 |
| VDD Range | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 3.6 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| ADC | 10-bit, 12 channels | 10-bit, 12 channels | 10-bit, 12 channels | 10-bit, 12 channels | 10-bit, 17 channels | 10-bit, 12 channels |
| PWM Channels | 8 | 8 | 8 | 8 | 10 | 4 |
Key Differentiators
- Integrated on-chip op-amps reduce BOM and PCB area (vs PIC16F1509-I/SO)
- Core-Independent Peripherals (CLC, COG) offload CPU (vs PIC16F1708-I/SO)
- Peripheral Pin Select simplifies PCB layout (vs PIC16F1718-I/SO)
- Industrial temperature grade for harsh environments (vs PIC16F1709-E/SO (extended -40C to +125C))
Design Notes
The PIC16F1709-I/SO operates from 1.8 V to 5.5 V with a typical active current of 1.4 mA at 32 MHz and XLP sleep current under 1 uA. Place a 0.1 uF decoupling capacitor within 5 mm of the VDD pin and a bulk 10 uF tantalum or aluminum capacitor near the supply entry point. For battery-powered designs, use the LF variant for sub-1 uA sleep performance, but verify peripheral functionality at the lower voltage range.
When using the on-chip op-amps, route analog input traces away from digital switching signals and keep the OPA feedback network close to the OPA1IN-/OPA1IN+ pins to minimize parasitic capacitance. The DAC outputs should be buffered externally if driving low-impedance loads - the 8-bit DACs have limited drive strength. Use a ground plane and place analog and digital ground returns to a single star point near the MCU VSS pin.
The PIC16F1709 uses Peripheral Pin Select (PPS) to remap digital functions, but PPS must be unlocked in software before configuration - a locked PPS is a common debugging mistake. Also note that the on-chip op-amps consume the analog pins RA6/RA7/RC0/RC1 - if you need both op-amp outputs and the crystal oscillator, you must choose between them. Always check the PPS mapping table in MPLAB X Code Configurator before finalizing the pinout.
For UART communications at 115200 baud and above, the internal 32 MHz oscillator may need calibration to maintain timing accuracy. The factory HFINTOSC tolerance is +/-2% across voltage and temperature - adequate for most protocols but borderline for CAN or high-speed SPI. For precision timing, switch to an external 32.768 kHz crystal on SOSCO/SOSCI for the Timer1 timebase, which provides +/-20 ppm accuracy for RTC applications.
Compliance Information
Industrial-grade -I variant (-40C to +85C). Not AEC-Q100 qualified - for automotive applications consider AEC-Q100 qualified dsPIC33 or PIC16F18855 families. RoHS and REACH compliant per Microchip material declaration.