Adafruit
8 MHz Ceramic Resonator / Oscillator
This 8 MHz ceramic resonator is a breadboard-friendly oscillator with built-in load capacitors, making it a simple drop-in timing source for microcontrollers...
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This 8 MHz ceramic resonator is a breadboard-friendly oscillator with built-in load capacitors, making it a simple drop-in timing source for microcontrollers. With 0.5% accuracy, it's well suited for everyday electronics, UART baud-rate generation, and general microcontroller clocking.
The 3-pin package has 0.1" pin spacing — connect the two outer pins to XTAL-in and XTAL-out (the package is symmetric), and the centre pin to ground. No external capacitors needed.
Key Features
- 8 MHz Frequency – Common microcontroller clock speed
- Built-In Load Capacitors – No external caps required
- 0.5% Accuracy – Suitable for UART and general timing
- Breadboard Friendly – 0.1" (2.54 mm) pin spacing, 3-pin package
- Symmetric Package – Either outer pin can be XTAL-in or XTAL-out
Also Available
- 8 MHz Crystal + 20 pF Capacitors – Higher precision (30 PPM) for USB timing and RF applications
Package Contents
- 1× 8 MHz Ceramic Resonator
Jargon buster
Plain-language definitions for the technical terms used above.
- baud
- Baud is the signalling rate of a serial connection, often used as the speed setting for UART communication. Matching the baud rate matters because both connected devices must use the same setting for readable data.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- 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.
- UART
- UART is a simple asynchronous serial interface that sends data over separate transmit and receive wires, usually labelled TX and RX, with both ends set to the same baud rate. It is a common way for microcontrollers and other serial devices to exchange data.
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