Adafruit
16 MHz Crystal + 20pF capacitors
A 16.000 MHz quartz crystal in the HC49/US short-style package, supplied with two 20pF load capacitors. The crystal provides higher precision than ceramic re...
A 16.000 MHz quartz crystal in the HC49/US short-style package, supplied with two 20pF load capacitors. The crystal provides higher precision than ceramic resonators, with 30 PPM tolerance and 50 PPM stability — suitable for USB timing, long-term timekeeping, and RF/PLL/VCO applications.
The breadboard-friendly package has two pins with symmetric pinout. Connect one pin to XTAL-in and the other to XTAL-out on your microcontroller, with one 20pF capacitor from each crystal pin to ground. Check your microcontroller datasheet for any additional components (e.g. a 1 MΩ feedback resistor).
Specifications
- Frequency – 16.000 MHz
- Tolerance – ±30 PPM
- Stability – ±50 PPM
- Package – HC49/US (short style)
- Load Capacitance – 20pF (capacitors included)
Ideal For
- Arduino-compatible builds requiring precise 16 MHz clocking
- USB timing on ATmega32U4 and similar MCUs
- Applications requiring higher precision than ceramic resonators
Package Contents
- 1× 16 MHz quartz crystal (HC49/US)
- 2× 20pF ceramic capacitors
Jargon buster
Plain-language definitions for the technical terms used above.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- ppm
- ppm means parts per million, a common way to express very small gas concentrations in air. For CO₂ sensors, the ppm range tells you what levels the sensor can measure, such as normal indoor air through to poorly ventilated spaces.
- RF
- RF means radio frequency, referring to signals used for wireless communication and other high-frequency electronics. A low-noise, stable power supply is important for RF circuits because power noise can affect signal quality and measurements.
- Tolerance
- Tolerance tells you how far the real resistance value may be from the printed value. A 1% resistor is useful when a circuit needs more predictable behaviour than a looser 5% or 10% part.
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Circuitry & IOT
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