Crystal Unit – Frequency Range 12 MHz to 50 MHz

Category: Crystals Resonators, Electronics, Seiko Epson Corporation

Overview

The datasheet details SEIKO EPSON CORPORATION’s FA-238V and FA-238 family of crystal units, designed for applications in various electronic devices. Both models operate in a frequency range of 12 MHz to 50 MHz, with an overtone order that is fundamental. Recommended for use in mobile phones, Bluetooth devices, W-LAN and ISM band radios, and as a clock for MPUs, these crystal units are built to meet precise frequency requirements for high-technology electronics.

Physical Specifications

Dimension-wise, the units have external dimensions of 3.2 x 2.5 x 0.6 mm in the case of the standard FA-238 and FA-238V, and 3.2 x 2.5 x 0.7 mm for the TSX-3225 model. The design includes an internal connection top view, indicating pin configurations, and a footprint for recommended mounting on a circuit board.

Performance Specifications

Performance characteristics cover a storage temperature range from -40°C to +125°C and an operating temperature range from -40°C to +85°C or +105°C, depending on the variant. Frequency tolerance at room temperature is specified at ±10 ppm or ±15 ppm, and for frequency versus temperature characteristics, it advises to contact SEIKO EPSON CORPORATION for specifications not listed.

The load capacitance can be specified by the customer, ranging from 7 pF to 20 pF, and the frequency aging is ±10 ppm per year maximum. Electrical specifications are also provided, with motional resistance values (ESR) detailed for different frequency bands, suggesting maximum resistance figures depending on the operating frequency.

Designation and Ordering Information

For ordering, the product name should be formed as FA-238V 12 OOOOOOMHZ 120 +15.0-15.0, with the corresponding model, operating frequency, load capacitance, and frequency tolerance provided in the designation. The datasheet also provides a notice that for the FA-238 variant above 40 MHz, only standard specifications apply.

Additional Notes

Purchasers are advised to specify any required frequency temperature characteristics and the operating temperature range upon inquiry. It is also noted that certain pins on the package should be connected to ground, as indicated in the internal connection diagram.

Environmental Compliance

The product complies with RoHS restrictions on hazardous substances, ensuring the crystal units are suitable for use in equipment that must meet these environmental standards.

Final Remark

This datasheet serves as a quick reference guide for understanding the basic features, specifications, and design considerations of SEIKO EPSON CORPORATION’s crystal units applicable to high-frequency precision devices.