1.2x1.0mm crystal preserves ESR characteristics of larger devices

January 11, 2017 // By Julien Happich
Murata has introduced what the company claims to be the world's smallest high precision crystal unit for use in mobile equipment and modules that use wireless technology such as Wi-Fi and Bluetooth, the XRCED series.

With most crystal units, ESR worsens when the vibrating area of a crystal is restricted due to the effects of miniaturisation. But through the use of a special packaging technology and high precision assembly, Murata was able to achieve very favorable ESR values while decreasing the size of its previous crystal unit to a 1.2x1.0mm footprint. Conforming to RoHS regulations, the 37.4MHz XRCED37M400FXQ52R0 crystal unit is lead free (phase 3) and allows lead-free soldering.  The component offers a frequency tolerance of +/- 20 ppm across a temperature range of -30 to 85 °C.  The maximum ESR is 60 ohms and the drive level is 100 microwatts maximum.
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