RF & Microwave, , Component Distributors Inc. (CDI) A temperature-controlled crystal oscillator (TCXO) is a voltage-controlled crystal oscillator (VCXO) with an on-board circuit that will tune the crystal as the surrounding temperature changes.  In many cases, the voltage-control pin is also available to the user, making this a hybrid voltage/temperature controlled oscillator (VCTCXO).  TCXO oscillators are more stable than XO or VCXO products, but generally not as stable as an OCXO product.
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