How to find the right Industrial Electrical Crystals AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Industrial Electrical Crystals
- Frequency and mode
- Match the exact frequency. For higher frequencies, confirm fundamental vs overtone mode as your circuit expects. An overtone crystal in a fundamental-mode circuit may oscillate at the wrong frequency or not at all.
- Load capacitance
- Match the crystal's specified load capacitance. External load capacitors are roughly twice the difference between CL and stray capacitance. Mismatched load capacitance pulls the frequency off target and can affect startup.
- Tolerance and stability
- Check initial tolerance and stability over temperature in ppm against your accuracy needs. Clock accuracy, UART timing and RF channels depend on total frequency error.
- ESR and drive level
- Crystal ESR must be within the oscillator circuit's limits, and drive level must not exceed the crystal's rating. High ESR causes startup failures. Overdriving ages or damages the crystal.
- Package
- Match footprint and pinout, such as through-hole HC-49 or SMD sizes like 3225 or 2016, including any ground pins. SMD crystal packages of similar size often differ in pin assignment.
Brands that matter
- Epson: Leading quartz crystal and timing device maker.
- Abracon: Broad crystal catalog with clear datasheets.
- ECS: Wide range of crystals in common packages.
- NDK: Major Japanese crystal manufacturer.
- Kyocera: Crystals and timing components.
- TXC: High-volume crystal maker widely used in consumer and industrial boards.
- CTS: Frequency control products for industrial use.
What to avoid
- Crystals listed without load capacitance or tolerance specifications
- Assuming SMD crystals of the same size share a pinout
- Using an overtone crystal where a fundamental-mode part is required
Questions
What is the difference between a crystal and an oscillator?
A crystal is a passive resonator that needs an external oscillator circuit, usually inside the microcontroller. An oscillator module includes the circuit, needs power, and outputs a ready-to-use clock.