Oscillator Selection Guide

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Oscillator Selection Guide

Your Application Points to the Oscillator Type. Start Here.

Match your scenario to the right series. One click to see what fits.

Room-temperature, cost-sensitive, general-purpose clocking.

Standard reference clocks for microcontroller units and digital architectures.

Crystal Oscillators

Browse XO

Wide temperature range, frequency must hold tight.

Temperature-compensated. ±0.5 to ±2.5 ppm over −40°C to +85°C. No oven warm-up time.

TCXO's / VCTCXO's

Browse TCXO / VCTCXO

PLL clock recovery, frequency synchronization, tunable output.

Voltage-controlled pull range for flexible frequency locking to an external reference.

VCXO's

Browse VCXO

Communications base station, test instrumentation, ultra-high stability.

Oven-controlled core delivering ±0.5 ppb to ±50 ppb stability where every Hz counts.

OCXO's

Browse OCXO

Laboratory-grade instrumentation, critical timing references.

Engineered stability matrices to eliminate drift under varying operating conditions.

High Precision Oscillators

Browse High Precision

Battery-powered IoT, coin-cell wearables, always-on sensors.

Optimized for micro-ampere current draw to maximize system operational lifetime.

Low Power Oscillators

Browse Low Power

High-speed digital links, SerDes clocking, PCIe interfaces.

Sub-picosecond integrated phase jitter to preserve data integrity and timing margins.

Low Jitter Oscillators

Browse Low Jitter

RF transceivers, radar systems, sensitive analog front-ends.

Optimized close-in noise floor for high channel selectivity and signal purity.

Low Phase Noise Oscillators

Browse Low Phase Noise

Automotive under-the-hood, industrial downhole, outdoor infrastructure.

Extended thermal operating range supporting reliable startup up to +125°C.

High Temperature Oscillators

Browse High Temperature

EMI-sensitive systems, high-density digital boards.

Peak electromagnetic interference radiation reduction through internal frequency modulation.

Spread Spectrum Oscillators

Browse Spread Spectrum

High-speed differential signaling applications.

Supports LVDS, LVPECL, and HCSL outputs for robust noise immunity in complex layouts.

Differential Output Oscillators

Browse Differential Output

Know Your Type? Now Get to The Part Number.

Three ways to go from oscillator type to the exact model on your BOM.

Filter it yourself.

Go straight to Parametric Search. Set your frequency, stability, package, and output waveform. See matching part series with specs side by side. The fastest path if you know exactly what you need.

Open Parametric Search

Download the comparison sheet.

XO. TCXO. OCXO. VCXO. All four types, key parameters in one .xlsx spreadsheet — frequency range, stability grades, package dimensions, output options, and ordering codes. Print it. Mark it up. Share it with your team.

Download Spreadsheet (.xlsx)

Upload your design requirement.

Drop your spec sheet, BOM draft, or block diagram here. Our engineering team maps your requirements to specific Fcom part numbers — and explains why each one fits. No catalog link. An engineer reviews your spec.

Upload your spec

What If the Standard Range Doesn't Have Your Spec?

Oscillator selection doesn’t end at the catalog. Three ways we close the gap.

Your frequency falls between standard values.

The exact frequency your design needs — 19.44 MHz, 38.88 MHz, 122.88 MHz — isn’t in the standard lineup. Fcom’s custom crystal engineering produces oscillators at non-standard frequencies with the same stability, package, and output options as the catalog parts. You specify the frequency. We build to it.

View custom parameters

Your stability or phase noise requirement is tighter than the standard grades.

±1 ppm over temperature for a TCXO. -165 dBc/Hz at 10 kHz offset for an OCXO. These aren’t catalog specs — they’re engineering targets. Our team can review what’s achievable within your frequency, package, and budget constraints.

Talk to an engineer about your spec

Your package and output combination doesn't exist in the standard portfolio.

HC-49S with LVPECL output. SMD 2.0×1.6 with CMOS at 3.3 V. An OE pin on a TCXO in a 5×3.2 package. These are configuration problems, not feasibility problems. Send us your mechanical and electrical requirements — we’ll confirm what can be built.

Upload your full requirements