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Quartz crystal

Products > General Information for Quartz Crystal

Quartz Crystal (Select Type to see complete product list)

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Quartz Crystal General Information

Quartz crystal HC49S Thru Hole 32.768 KHz SMD Quartz Crystal Tuning Fork 5x7mm Surface Mount Quartz Crystal 4 Pad HC49SMD Surface Mount Low Cost Quartz Crystal
Go to all [ Quartz Crystal ] [ Surface Mount Quartz Crystal ]

1. Constant Electrical Parameters of Quartz Crystals

Generally, Quartz Crystals are manufactured according to industry standard guidelines pertaining to such variables as package type, (a.) Mode of Operation, (b.) Equivalent Series Resistance, (c.) Shunt Capacitance, and (d.) Drive Level. Although these parameters may vary slightly between manufactures, and review of these parameters should be done when crossing between manufacturers, one can generally assume that these parameters will remain constant.

a. Mode of Operation (Resonance Frequency):
A Quartz Crystal has two basic modes of operation comprising Fundamental and Overtone Modes. For frequencies below 30MHz, a crystal manufacturer will use the Fundamental Mode of operation. For frequencies exceeding 30 MHz, overtone modes are recommended (overtones are not precise integer multiples of the fundamental as in a similar concept found in harmonics) Higher Fundamental mode Crystals are possible, however the crossover at 30MHz is generally considered the point where the Fundamental mode Crystal becomes more expensive to produce due to thinning of the quartz blank (increasing breakage during production). Using Overtone Modes in production therefore reduces manufacturing costs for higher frequency applications. A good rule of thumb is to assume the a Crystal manufacturer will produce a Fundamental Crystal below 30MHz, and an Overtone Crystal above 30MHz. If higher frequencies are required in the Fundamental Mode, please contact Oscilent for support and details on Inverted Mesa technology.

b. Equivalent Series Resistance (ESR):
The Equivalent Series Resistance is the resistive element of the quartz crystal equivalent circuit. This range is normally found to be 25-100 ohms for most Quartz Crystals and is usually specified as a maximum value. Typically, these values are specified according to frequency ranges and are very similar across multiple manufactures because similar holder types, electrodes, modes of operation, and mounting structures are used in achieving specific frequencies. More significant at lower frequencies, it should be noted that ESR values at a given frequency for an AT- strip cut crystal (commonly used in Surface Mount devices) are higher than that of the standard (round blank) design (commonly found in Through Hole devices)

c. Shunt Capacitance:
The electrodes present in a Quartz Crystal, plus the stray capacitance of the holder, form a capacitance in parallel with the LC model. Generally, the Shunt Capacitance is sought to be as low as possible in manufacturing the device, as some oscillators cannot tolerate an excessive value. Because Shunt Capacitance may vary according to the size of the Crystal, manufacturers will normally designate a maximum value usually at 7.0pF. If a lower value is required, we suggest contacting Oscilent Engineering Support.

d. Drive Level:
Specified by Quartz Crystal manufacturers to provide a guideline for maximum values, the Drive Level should be held to a minimum to avoid problems with Aging, Stability, nonlinear coupled modes, and other nonlinear effects. Improvements in phase noise performance can be realized with increased drive levels, however, so careful consideration should be given to this Electrical Parameter when approaching the maximum suggested level.

2. Specifying an Oscilent Quartz Crystal
(Variables that must be selected by the design engineer)

Variable Electrical parameters are those that the Design Engineer must specify when selecting a Quartz Crystal device for any particular application. Although Oscilent offers a wide range of these variables in the Part Number Guide section of our Specification, other, more custom parameters, are available:

a. Package Type: Will the package be Through Hole or Surface Mount, and are there size constraints with either.

b. Frequency

c. Load Capacitance: The specified Load Capacitance is dependent on the Resonance Mode required in the application ( for more detailed information on this subject Definitions of Load Capacitance ) For Series resonance, no Load Capacitance is required ("SR" in the Oscilent part number). For Parallel Resonance, the Load Capacitance specified by the Design Engineer will be used to calibrate the Quartz Crystal thereby effecting the major operating characteristics of the device, including initial Frequency Tolerance.

d. Frequency Tolerance: At 25 degree Celsius, an amount of initial frequency deviation acceptable for the application is required. Tighter specifications of Frequency Tolerance lower yield in Quartz Crystal Blank production thereby serving to increase production costs.

e. Stability: Over the Operating Temperature Range, an amount of total deviation acceptable for the application. Tighter specifications of Stability lower yield in Quartz Crystal Blank production thereby serving to increase production costs.

f. Operating Temperature: Standard Operating Temperature ranges are generally considered as -20-+70 degrees Celsius (considered "commercial" Operating Temperature), and -40-+85 degrees Celsius (considered "Industrial" Operating Temperature) Other Operating temperature ranges are available and should be specified and/or discussed with an Oscilent Technical advisor.

For more more technical information, including Term Definitions, Suggested Reading Material, and Engineering Support, please visit the Oscilent Engineering Support page.

PDF Library of Quartz Crystal Products
Oscilent Series
Number [ pdf spec ]
Type Package Frequency Range html Version

111 ~ 113

Thru Hole Tuning Fork 32.768 KHz
121 ~ 122 Thru Hole Cylindrical 40 ~ 76.8 KHz
141 ~ 142 Thru Hole HC49U 1.8 ~ 100 MHz

151

Thru Hole HC49S 3 ~ 75 MHz
152 Thru Hole HC49S LP 3.2 ~ 85 MHz

153

Thru Hole HC49S 3 ~ 75 MHz
161 ~ 162 Thru Hole UM-1 10 ~ 125 MHz
171 ~ 175 Thru Hole Cylindrical 3.57 ~ 60 MHz

221 ~ 222

Surface Mount Gull Wing 25 ~ 300 MHz

223

Surface Mount Tuning Fork 32.768 KHz

224

Surface Mount Ultra Slim 32.768 KHz

228

Surface Mount 4.1x1.5mm 2pad 32.768 KHz
229 Surface Mount 3.2x1.5mm 2pad 32.768 KHz
230 Surface Mount 2x1.2mm 12 ~ 35 MHz

250 ~ 251

Surface Mount HC49SMD 3 ~ 75 MHz
252 ~ 255 Surface Mount HC49SMD 4pad 3.58 ~ 70 MHz
264 Surface Mount 5x7mm 12 ~ 35 MHz
265 Surface Mount 5x7mm 2pad 12 ~ 35 MHz
266 Surface Mount 5x3.2mm 12 ~ 40 MHz
267 Surface Mount   5x3.2mm 2pad 12 ~ 40 MHz
268 Surface Mount 6x3mm 12 ~ 40 MHz
269 Surface Mount 6x3mm 2pad 12 ~ 40 MHz
274 Surface Mount 5x7mm 6 ~ 80 MHz
276 Surface Mount 5x3.2mm 12 ~ 36 MHz
278 Surface Mount 3.2x2.5 13 ~ 54 MHz
279 Surface Mount 4x2.5mm 12 ~ 32 MHz
282 Surface Mount 5x7mm 2pad 9.8 ~ 100 MHz
290 Surface Mount 6x3.5mm 10 ~ 40 MHz
294 Surface Mount 8x4.5mm 6 ~ 40 MHz
295 Surface Mount 2x1.6mm 20 ~ 80 MHz
296 Surface Mount 2.5x2mm 16 ~ 60 MHz
201 Surface Mount UM-1 SMD 7 ~ 225 MHz
202 Surface Mount UM-5 SMD 10 ~ 200 MHz
203 Surface Mount HC49U SMD 1.8 ~ 85 MHz

Oscilent is a manufactuer of quartz crystal and a supplier worldwide for various applications and markets. Oscilent offers standard products and have designers in-house for custom quartz crystal devices.


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