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ECS expands line-up of SMD quartz crystals

26 Nov 2014

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ECS Inc. International, a designer and maker of silicon-based frequency control products, has expanded its portfolio of ECX-3SX SMD quartz crystals to include even tighter stability and tolerance levels. According to the company, the SMD quartz crystal features an industry-standard footprint of 12.5 x 4.6 x 3.7mm and can function as a drop-in replacement for the end-of-life Citizen CM309S.

Featuring 3.57-70MHz frequency range, the ECX-3SX boasts an excellent frequency stability of ±50ppm at -10°C to 70°C, and frequency tolerance is an equally outstanding ±30ppm at 25°C, making this crystal an excellent choice for surface-mount applications, noted ECS. An extended temperature range also becomes an option for the device. In terms of aging, ECX-3SX averages 5ppm at 25°C ±3°C.


Notable applications for ECX-3SX include reference clocks for microprocessors and communications devices, including RF devices.

This SMD quartz crystal complies with both the RoHS 2 and REACH requirements of the EU. The ruggedised melded package is made from the same industry-standard thermoplastic normally used for IC production.

ECS has also announced the availability of the ECX-32-CKM sub-miniature SMD crystal, delivering extremely tight tolerance and stability in a 3.2 x 2.5mm footprint. This CKM version has an industry-leading frequency tolerance of ±10ppm at 25°C, flaunted the company.

The sub-miniature 3.2 x 2.5 x 0.8mm (LWH) ceramic package is intended for high-efficiency SMT-line manufacturing environments delivering high-density circuit boards.


The ECX-32-CKM crystal is fully compliant with the RoHS 2 and REACH requirements of the EU. The packaging is rated at Moisture Sensitivity Level (MSL)1. The lead finish is gold (Au).

A typical application for ECX-32-CKM would be a timing reference for highly compact mobile devices where pristine wireless communication is a crucial requirement, including low-power wireless implementations such as those at the IEEE 802.15.4 standard, including ZigBee.

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