Crystals

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	Mfr Part #	Quantity Available	Price	Series	Package	Product Status	Type	Frequency	Frequency Stability	Frequency Tolerance	Load Capacitance	ESR (Equivalent Series Resistance)	Operating Mode	Operating Temperature	Ratings	Mounting Type	Package / Case	Size / Dimension	Height - Seated (Max)
	AS-12.000-20 CRYSTAL 12.0000MHZ 20PF TH Raltron Electronics	2,242 In Stock	1 : $0.24000 Bulk	AS	Bulk	Active	MHz Crystal	12 MHz	±50ppm	±30ppm	20pF	50 Ohms	Fundamental	-20°C ~ 70°C	-	Through Hole	HC-49/US	0.447" L x 0.197" W (11.35mm x 5.00mm)	0.138" (3.50mm)
	ECS-80-18-4X-CKM CRYSTAL 8.0000MHZ 18PF TH ECS Inc.	1,179 In Stock	1 : $0.69000 Bulk	HC-49USX	Bulk	Active	MHz Crystal	8 MHz	±10ppm	±10ppm	18pF	80 Ohms	Fundamental	-20°C ~ 70°C	-	Through Hole	HC-49/US	0.447" L x 0.183" W (11.35mm x 4.65mm)	0.138" (3.50mm)

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Crystal products are passive components most commonly used as time or frequency references in electronic systems. Consisting of a piezoelectric crystal that mechanically vibrates at a known frequency, their use requires provision of an external oscillator circuit with carefully designed capacitance, drive voltage, and series resistance characteristics, to generate a signal at the indicated crystal frequency that operates successfully over the operating temperature range, without damaging the crystal element. Active devices which integrate this additional necessary circuitry are considered oscillators and are catalogued separately.