X21-24.000-12-30/30/-40+85

**X21 CRYSTALS** 

- **Frequency range 20MHz to 54MHz, fundamental mode Ultra-miniature package 2.05 x 1.65 x 0.6mm Packaged in standard EIA tape and reel Ideal for PDAs, hand-held GPS, PCMCIA etc. Extremely low ageing and shock & vibration resistance** 

## **2.05 x 1.65 x 0.6mm SMD** 

## **OUTLINE & DIMENSIONS** 

## **DESCRIPTION** 

X21 crystals are ultra-miniature AT-cut crystals covering the frequency range 20.0MHz to 54.0MHz in fundamental mode. The X21 crystal package is grounded via the top metal lid and two solder pads. the part exhibits very low ageing and has high shock and vibration resistance. The small size and low mass makes these crystals ideal for miniaturized hand-held equipment and similar high-density applications. 

## **SPECIFICATION** 

Frequency Range AT-Cut Fundamental: 20.0MHz to 54.0MHz Calibration Tolerance at 25ºC: ±10ppm, ±20ppm, ±30ppm Frequency stability -10° to +60°C from ±5ppm -20° to +70°C from ±10ppm -40° to +85°C from ±15ppm Storage Temperature: -50°~+105°C Equivalent Series Resistance: See table Shunt Capacitance (C0): 2pF to 4pF typical, 5pF maximum Load Capacitance (CL): Series or from 8pF to 32pF Ageing: <±3ppm per year at +25°C Drive level: 10µW typical, 100µW max. Reflow Soldering: 10s maximum at 260°C twice or once 180s at 230°C. Packaging: EIA tape and reel 

## **FREQUENCY STABILITY vs. OPERATING TEMPERATURE RANGE** 

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Stability Temperature Stability ppm<br>Code Range ±5 ±10  ±15 ±20 ±25 ±30<br>X  -10 to +60°C ü  ü  ü  ü  ü ü<br>Y  -20 to +70°C n  ü  ü  ü  ü ü<br>I  -40 to +85°C ü  ü  ü ü<br>**----- End of picture text -----**<br>


ü = available, n = contact Mercury 

## **EQUIVALENT SERIES RESISTANCE** 

|**Frequency**|**ESR**|
|---|---|
|**Range MHz**|**Ohms Max.**|
|20.0~30.0|120|
|30.1~54.0|80|



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PART NUMBER FORMAT<br>  X21 - 22.000 - 12 - 15/20/-20+70/100R<br>Example:<br>Package X21<br>Frequency in MHz I<br>      Load Capacitance (Either SR for series or CL in of<br>     Calibration tolerance<br>        at 25°C (±ppm)<br>       Temperature Stability<br>     over temp. range (±ppm)<br>         Operating Temp. Range (°C)<br>Or use<br>  'X' for -10 to +60°C<br>  'Y' for -20 to +70°C<br>(Lower and     'I' for -40 to +85°C upper limits) |<br>          Equivalent Series Resistance (Optional -value use whenis required)sec<br>**----- End of picture text -----**<br>


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