{"title":"Adafruit Si5351A Clock Generator with STEMMA QT - 8KHz to 160MHz","handle":"adafruit-si5351a-clock-generator-with-stemma-qt-8khz-to-160mhz","url":"/products/adafruit-si5351a-clock-generator-with-stemma-qt-8khz-to-160mhz","description":"The Adafruit Si5351A Clock Generator with STEMMA QT lets you generate precise, arbitrary clock frequencies from 8 kHz to over 150 MHz using a simple I2C interface. This updated version adds STEMMA QT / Qwiic connectors for solderless hookup alongside the traditional breadboard headers.\n\nWith a precision 25 MHz crystal reference and internal PLLs and dividers, it provides three independent outputs, each configurable to a different frequency with 3 Vpp output levels. Output #1 supports an optional edge-launch SMA connector for RF work. Onboard 3.3 V regulation and I2C level shifting allow use with both 3 V and 5 V systems.\n\nKey Features\n\n\nSi5351A Clock Generator – I2C-controlled with onboard 25 MHz precision crystal reference\n\nWide Frequency Range – 8 kHz to 150+ MHz output\n\n3 Independent Outputs – Each output can be set to a different frequency\n\n3 Vpp Output – Via header pins; output #1 supports optional edge-launch SMA connector\n\nSTEMMA QT / Qwiic Connectors – Solderless I2C connection and daisy-chaining\n\n3–5 V Power – Onboard 3.3 V LDO regulator and level shifting\n\nArduino & CircuitPython – Library support for both platforms\n\n\nAlso Consider\n\n\nSi5351A Clock Generator Breakout (non-QT) – Original version with SMA connector pads on all three outputs\n\n\nIdeal For\n\nReplacing fixed crystals and oscillators in prototypes\nRF and radio projects requiring precise clock signals\nTest and measurement equipment\nDigital signal processing and clock generation\n\n\nPackage Contents\n\n1× Adafruit Si5351A Clock Generator with STEMMA QT\n\n\n\nNote: STEMMA QT / Qwiic cable and SMA connector are not included.\n\n\nResources\n\nAdafruit Si5351 Clock Generator Guide & Library\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":1847,"title":"Default Title","sku":"AF-5640","price":15.33,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":63,"option1":"Default Title"}]}