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...
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 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.
- UART
- UART is a simple serial connection that sends data over separate transmit and receive wires, often labelled TX and RX. It matters because this module is designed to replace a wired UART cable with a wireless link while keeping the same serial data format.
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