PIC16F1708-I/ML - 8-Bit 32MHz MCU, 7KB Flash, 20-QFN | Microchip
MPN: PIC16F1708-I/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.05 | $2.05 |
| 10 | $1.83 | $18.30 |
| 100 | $1.56 | $156.00 |
| 500 | $1.34 | $670.00 |
| 1,000 | $1.18 | $1,180.00 |
PIC16F1708-I/ML Overview
What is a PIC16F170x microcontroller? The PIC16F1704/1708/1709 family sits within Microchip's enhanced mid-range PIC16 lineup - an 8-bit RISC architecture MCU family used in cost-sensitive general-purpose embedded designs. It bridges low-end PIC10/12/16 baseline parts and higher-end PIC18/PIC24 devices, integrating analog functions traditionally implemented as external op-amps, comparators and reference circuits. The -I/ML suffix indicates the industrial temperature grade (-40C to +85C) and the QFN-20 (4x4 mm) package option.
Key features include 32 MHz operation (200 ns instruction execution), 7 KB self-programmable Flash, 256 bytes EEPROM, 4-channel 10-bit ADC with hardware Capacitive Voltage Divider, two rail-to-rail op-amps, two high-speed comparators, Complementary Output Generator (COG), Configurable Logic Cell (CLC) modules, Zero-Cross Detect (ZCD), EUSART, two I2C/SPI interfaces, 2x 10-bit PWM, and eXtreme Low Power features including <50 nA sleep currents. These peripherals are accessible through Peripheral Pin Select (PPS), giving board designers flexibility to remap digital functions on most I/O pins.
Typical applications span IoT sensor nodes, white goods and home appliances, lighting controls with TRIAC dimming, battery chargers, power-conversion secondary-side control, low-cost medical and consumer devices, and small motor-control subsystems. The combination of analog integration and XLP low-power modes allows the device to replace multiple discrete analog components and run from small batteries for years.
When designing with the PIC16F1708-I/ML, ensure the QFN exposed pad is soldered to the PCB ground plane for thermal dissipation and electrical performance. Use MPLAB X IDE with the XC8 compiler and the PICkit or ICD programmer/debugger. Consider migrating to PIC16F171x (28- and 40-pin siblings) when more peripherals are needed without changing the firmware architecture. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes beyond the manufacturer datasheet to assist BOM selection and second-sourcing.
Drop-in alternatives for PIC16F1708-I/ML — 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 PIC16F1708-I/ML (same form factor and footprint) — differing in ADC, Package, Timers, I/O Pins, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F1707-I/ML
✅ Drop-In✓ In Stock
$0.72 / Unit
View Datasheet →PIC16F1615-I/ML
✅ Drop-In✓ In Stock
$0.84 / Unit
View Datasheet →PIC16F1509-I/ML
✅ Drop-In✓ In Stock
$1.02 / Unit
View Datasheet →PIC16F1708-I/ML Maximum Ratings & Electrical Characteristics
| Core | PIC16 8-bit RISC |
| Program Memory (Flash) | 7 KB (4K x 14 words) |
| Data SRAM | 512 bytes |
| Data EEPROM | 256 bytes |
| CPU Speed | 32 MHz (200 ns instruction cycle) |
| Supply Voltage Range | 2.3 V to 5.5 V |
| Operating Temperature | -40C to +85C (Industrial, -I) |
| Package | 20-pin QFN (4x4 mm) |
| I/O Pins | 17 |
| ADC | 10-bit, up to 12 channels (CVD support) |
| Comparators | 2x high-speed comparators |
| Op-Amps | 2x on-chip rail-to-rail op-amps |
| Core Independent Peripherals | CLC, COG/NCO, ZCD, PPS |
| Communication | EUSART, 2x I2C/SPI |
| PWM | 2x 10-bit PWM |
| Timers | 8-bit and 16-bit timers |
| RoHS Status | Compliant |
| Mounting Type | Surface Mount |
PIC16F1708-I/ML Pin Configuration
| Pin 1 | RA5 — GPIO/AN4/C1OUT/PPS |
| Pin 2 | RA4 — GPIO/AN3/C1IN+/PPS |
| Pin 3 | RA3 — GPIO/AN2/C1IN0-/VREF+/PPS |
| Pin 4 | RA2 — GPIO/AN1/C2IN+/PPS |
| Pin 5 | RA1 — GPIO/AN0/C2IN0-/ICSPCLK/PPS |
| Pin 6 | RA0 — GPIO/ICSPDAT/PPS |
| Pin 7 | VSS — Ground |
| Pin 8 | RA7 — GPIO/OSC1/CLKIN/PPS |
| Pin 9 | RA6 — GPIO/OSC2/CLKOUT/PPS |
| Pin 10 | RC0 — GPIO/SOSC/T1CKI/PPS |
| Pin 11 | RC1 — GPIO/CCP2/PPS |
| Pin 12 | RC2 — GPIO/CCP1/PPS |
| Pin 13 | RC3 — GPIO/SCL1/PPS |
| Pin 14 | RC4 — GPIO/SDA1/PPS |
| Pin 15 | RC5 — GPIO/SDO1/PPS |
| Pin 16 | RC6 — GPIO/TX/CK/PPS |
| Pin 17 | RC7 — GPIO/RX/DT/PPS |
| Pin 18 | RB7 — GPIO/ICSPDAT/PGED/PPS |
| Pin 19 | VDD — Positive supply |
| Pin 20 | VSS/EP — Ground / exposed thermal pad (must be soldered to PCB ground plane) |
Typical Applications
PIC16F1708-I/ML is suitable for 6 applications: IoT Sensor Node Firmware Controller, AC-Line TRIAC Dimming Lighting Control, White Goods and Home Appliance Control, Battery Charger Secondary-Side Control, Capacitive Touch User Interface, Small DC Motor and Fan Speed Control.
IoT Sensor Node Firmware Controller
The PIC16F1708-I/ML is well suited as the main MCU in battery-powered IoT sensor nodes. Its 32 MHz core runs sensor-fusion and Modbus/I2C handler firmware while the on-chip op-amps condition bridge and thermocouple signals at <0.1% FS error. The 10-bit ADC with CVD provides capacitive-touch and ratiometric measurement support. eXtreme Low Power modes drop quiescent current below 50 nA between transmissions, allowing years of life from a CR2032 cell. The 20-QFN footprint keeps the PCB under 10 mm x 10 mm for miniature sensor modules.
Recommended
AC-Line TRIAC Dimming Lighting Control
The PIC16F1708-I/ML integrates the Zero-Cross Detect (ZCD) and Complementary Output Generator (COG) peripherals needed for AC-line TRIAC dimming without external zero-cross circuits. The two 10-bit PWM outputs provide smooth dim curves while the high-speed comparator handles current-zero detection for inductive loads. Industrial temperature grade and QFN ground-pad thermal performance sustain operation in enclosed fixture environments. Firmware can store dim presets in 256 bytes of EEPROM and respond to wall switch events through the CLC peripheral.
Recommended
White Goods and Home Appliance Control
The PIC16F1708-I/ML powers control boards in washing machines, dishwashers, refrigerators, and microwave ovens. Its integrated op-amps close current loops for small BLDC pumps and fans while the 17 I/O pins drive keypads, seven-segment displays, and buzzer drivers. PPS reassigns peripheral functions across pins to simplify PCB routing in cramped enclosures. Industrial -40C to +85C operation tolerates kitchen and laundry thermal swings, and XLP sleep supports battery-backed clock retention across power cycles.
Recommended
Battery Charger Secondary-Side Control
The PIC16F1708-I/ML functions as the secondary-side controller in flyback or buck-derived Li-ion/LiFePO4 chargers. The two rail-to-rail op-amps close voltage and current regulation loops directly from the sense resistor and divider. The high-speed comparator supports synchronous rectification timing, and the 10-bit ADC reads battery thermistor and pack voltage for CC/CV profile enforcement. QFN-20 (4x4 mm) packaging suits compact 5-25 W charger wall-cube form factors.
Recommended
Capacitive Touch User Interface
The PIC16F1708-I/ML supports up to 12 capacitive touch channels via the integrated 10-bit ADC with hardware Capacitive Voltage Divider (CVD), removing the need for an external touch controller in small keypads and slider interfaces. CLC modules combine sensor inputs for gesture and proximity detection, while PPS routes wake-up lines to reduce current draw in standby. The QFN-20 package sits behind glass or plastic overlays in home automation and consumer products.
Recommended
Small DC Motor and Fan Speed Control
The PIC16F1708-I/ML drives small brushless DC or brushed DC fans and pumps using its 10-bit PWM with COG complementary outputs and on-chip op-amps for closed-loop current control. The high-speed comparator provides back-EMF sensing for sensorless trapezoidal commutation in low-cost BLDC designs. EUSART enables telemetry to a master controller for HVAC and small appliance feedback, while the 20-QFN footprint fits inside the motor housing for compact integrated designs.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F1708-I/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F1707-I/ML | PIC16F1615-I/ML | PIC16F1509-I/ML |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-QFN (4x4 mm) | 20-QFN (4x4 mm) - same | 20-QFN (4x4 mm) - same | 20-QFN (4x4 mm) - same |
| Flash Memory | 7 KB (4K x 14) | 3.5 KB (-50%) | 14 KB (+100%) | 14 KB (+100%) |
| SRAM | 512 B | 512 B | 1 KB | 1 KB |
| On-chip Op-Amps | 2 | 2 | 0 | 0 |
| Core Independent Peripherals (CLC/COG/ZCD) | Yes | Yes | Partial | No |
| CPU Speed | 32 MHz | 32 MHz | 32 MHz | 20 MHz |
| Operating Voltage | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V |
Key Differentiators
- On-chip analog integration (2 op-amps + 2 comparators + 10-bit ADC CVD) (vs PIC16F1509-I/ML)
- Core Independent Peripherals (CLC/COG/ZCD) for hardware-offloaded control (vs PIC16F1615-I/ML)
- Optimal Flash/SRAM balance for cost-sensitive designs (vs PIC16F1615-I/ML)
- 32 MHz CPU speed at same supply voltage (vs PIC16F1509-I/ML)
Design Notes
The 20-pin QFN (4x4 mm) PIC16F1708-I/ML requires the central exposed thermal pad (EP) to be soldered to a ground-plane pad on the PCB. A grid of thermal vias (typically 5-9 vias, 0.3 mm drill) under the EP improves thermal performance to approximately 40 C/W theta-JA and provides a low-impedance ground reference for the analog peripherals. Failure to solder the EP will cause thermal stress, erratic ADC readings, and reduced mechanical reliability.
Use a 100 nF ceramic decoupling capacitor within 3 mm of the VDD pin and a bulk capacitor (e.g. 1-10 uF) on the supply rail. For battery applications, leverage XLP sleep modes: configure the PIC16F1708 for <50 nA deep-sleep with RTC or WDT wake-up, and wake on interrupt from peripherals such as the comparator or Zero-Cross Detect. The MCP1700 LDO paired with this MCU achieves <2 uA quiescent current for always-on sensor designs.
Peripheral Pin Select (PPS) is unlocked by writing a specific sequence to the PPSLOCK register. Forgetting to unlock/lock PPS will cause peripheral functions not to appear on the assigned pins. Also note that the PIC16F1708-I/ML industrial grade is specified for -40C to +85C - if the design sees higher temperatures (e.g. enclosed fixtures), derate or use the -E (extended) variant if available. Do not confuse the -I/ML industrial QFN with the -I/SO industrial SOIC - they are NOT PCB drop-in compatible.
When using the on-chip ADC with CVD (capacitive voltage divider) for touch sensing or ratiometric measurements, route analog traces away from PWM and digital switching lines. The QFN-20 EP ground plane and dedicated analog AVSS/AVDD pins (if present in derivative parts) must be kept low-impedance. Use 100 nF + 1 uF decoupling on AVSS/AVDD. Sample acquisition time should be set generously (e.g. 4-8 us) when source impedance exceeds 5 kohm to avoid ADC gain errors.
Compliance Information
RoHS and REACH compliant per Microchip product page. Industrial temperature grade (-I). Not AEC-Q100 qualified; for automotive designs use PIC16F1708-E/SS or PIC16F1708-E/SO extended grade parts.