THIN SMD HIGH-FREQUENCY CRYSTAL UNIT FA-238 Datasheet Summary

Category: Crystals Resonators, Electronics, Epson Toyocom Corporation

Overview of the FA-238 High-Frequency Crystal Unit

The FA-238 crystal unit is a thin surface-mounted device (SMD) designed for high-density mounting on circuit boards. It boasts excellent reliability and environmental capability, perfectly tailored for applications in a wide frequency range between 20 MHz and 50 MHz. With a remarkably low profile of 0.7 mm, it is equivalent in thickness to SMD-type integrated circuits (ICs), making it suitable for compact electronic devices.

Key Specifications

The product’s nominal frequency range spans from 16.000 MHz to 50.000 MHz, operating in the fundamental mode. Its storage temperature range is from -55°C to +125°C, ensuring durability even when stored as unpacked bare product. The operating temperature range is slightly narrower, keeping the crystal stable from -20°C to +70°C. The device is designed for a maximum drive level of 2 mW, but a typical recommended drive level is set at 100 μW.

Frequency Tolerance and Stability

Frequency tolerance for the FA-238 is typically ±30 x 10^-6 with a standard option of ±150 x 10^-6, with custom options available on request. Frequency stability against temperature variations is also available custom or as standard, ranging from +12×10^-6 to +15×10^-6, across different operating temperature conditions.

Load Capacitance and Electrical Characteristics

Load capacitance for the product is usually set at 12 pF, but a range from 10 pF to standard is available. Series resistance is within the range of 100 Ω Max for frequencies between 16 MHz and 30 MHz, increasing up to 150 Ω Max for 30 MHz to 50 MHz frequency range. Shunt capacitance is constrained to 5.0 pF Max. The device’s insulation resistance is commendable at 500 MΩ Min, ensuring stability and sound electrical insulation.

Aging and Shock Resistance

The FA-238 is designed to be stable over time, with aging specified at +5×10^-6/year Max. The unit exhibits strong shock resistance able to withstand three drops from a height of 750 mm or an excitation test with 29400 m/s² X 0.3 ms X half sine wave X 3 directions.

Physical Attributes

Detailed internal connection diagrams and recommended soldering pattern dimensions are provided to facilitate easy integration into various design layouts. The datasheet includes a schematic representation of the crystal unit and the soldering pattern. Notably, terminals #2 and #4 are internally connected with a cover, a critical piece of information for circuit designers.

Optimization for Search Engines

For better search engine visibility, key technical parameters such as frequency range, drive level, series resistance, tolerance, and operational temperatures are highlighted. The emphasis on the unit’s slim profile, reliability, and resistance to environmental and mechanical stress adds to its appeal in the compact electronic component market.