Crystal Oscillators, Quartz Crystals and Resonators
Quartz timing parts: passive crystals versus powered oscillators
This collection contains quartz crystal resonators, powered clock oscillators, ceramic resonators, 315/433 MHz SAW resonators, and selected timing modules. The most important distinction is electrical: a passive quartz crystal is a resonant element that needs an oscillator circuit; a powered oscillator module or IC-based board generates a clock output when supplied correctly. A frequency printed in a product title does not make these parts interchangeable.
Types represented in the collection
- Passive quartz crystals: HC-49S/HC-49U through-hole and SMD cans, 5032 and 3225 surface-mount packages, smaller 2520 options, and cylindrical or FC-135/MC-series 32.768 kHz watch crystals are listed in different frequencies and pack sizes. Many source titles call these “passive crystal oscillators,” but the selected crystal itself does not deliver a powered CMOS clock. Match nominal frequency, specified load capacitance (CL), frequency tolerance, equivalent series resistance (ESR), drive-level limit, temperature range and footprint to the host oscillator circuit. A four-pad passive crystal need not be a powered four-pin oscillator.
- Powered clock oscillators: 7050, 5032 and 3225 active SMD choices, DIP-8/DIP-14 rectangular modules and certain SG3030 listings are offered across MHz frequencies. Confirm whether the selected item is truly an active oscillator, then check supply voltage, output waveform and logic level, enable/standby pin, output load, frequency stability, current and pinout. “3.3V–5V compatible” does not establish the same supply and output specification on every listing.
- Temperature-stabilized references: TCXO choices and a 10 MHz OCXO reference board serve designs needing controlled frequency drift. A TCXO compensates temperature-related error; an OCXO holds its crystal in a temperature-controlled environment and has distinct warm-up and power demands. Validate accuracy and stability in ppm, aging, phase noise, warm-up, supply, output level, waveform and 50 Ω termination from the selected device's documentation. The OCXO board listing mentions sine and square outputs; verify its exact option and enclosure before purchase.
- Ceramic and SAW resonators: Three-pin CSTCE/CSTLS ceramic resonators differ from quartz crystals in circuit requirements and frequency stability. LR315T2/LR433T2 and R315A/R433A 315/433 MHz acoustic-wave resonators are RF frequency-selective components, not generic 315/433 MHz logic clock oscillators; match frequency and circuit topology to the design.
- Related kits and equipment: Quartz frequency assortment kits, oscillator counter/tester DIY boards, ESP32-C6 and LGT8F328P development boards, an ATMEGA328P kit, inverter driver boards, a clock buffer board, CH340N ICs and miniature socket pins appear in search results. A board containing a crystal, a clock buffer that distributes a clock, a counter that measures one and a socket that holds a pin are not loose oscillators. Read each listing's included components and interfaces.
Practical selection checklist
- Start with the circuit's reference: passive resonator, CMOS or sine-wave oscillator, compensated frequency source or RF SAW part. Confirm exact frequency and units: 32.768 kHz is not 32.768 MHz.
- For passive crystals, match load capacitance and oscillator-driver requirements, ESR, drive level, tolerance and pad layout. The same frequency in HC-49 and 3225 packages does not guarantee an equivalent circuit.
- For powered devices, check the correct voltage and pin assignment before powering; compare output standard, output loading, jitter/phase-noise needs, stability, temperature and aging. Ppm is a frequency-error measure, not a guarantee of low jitter.
- Choose the selected frequency, package and quantity in the variant menu. Assortment packs and mixed-frequency listings should not be read as one crystal supporting every frequency in the headline.
FAQ
Will a passive 16 MHz crystal produce a 16 MHz signal by itself? No. It needs a compatible oscillator circuit and load conditions.
Can I replace a 32.768 kHz watch crystal with a 32.768 MHz oscillator? No. Their frequencies differ by a factor of 1,000 and their electrical interfaces are different.
Is a TCXO the same as an OCXO? No. Their temperature-control methods, warm-up, power and stability specifications differ; compare actual part data.
Source titles such as “original,” named manufacturers and certification claims are not independent proof of origin or approval for the selected item.
