12.85559

Crystals Overview

The Geyer Electronic America, Inc. part number 12.85559 is a fundamental mode quartz crystal resonator designed for surface-mount applications. It operates at a nominal frequency of 40 MHz with a frequency tolerance of ±30 ppm. The component features a load capacitance of 8 pF and an equivalent series resistance (ESR) of 80 Ohms. It is housed in a compact 4-SMD, No Lead package suitable for automated assembly processes. The device is rated for operation within a temperature range of -20°C to +70°C, ensuring stability in standard commercial environments.

Crystals Feature Summary

• Fundamental oscillation mode for precise frequency generation
• Compact 4-SMD no-lead surface mount package design
• Stable performance within specified commercial temperature limits

Crystals Applications

• General purpose clock signal generation
• Microcontroller system timing references
• Communication module frequency control

Crystals Procurement Notes

Verify the specific manufacturer datasheet for the 12.85559 part number to confirm exact electrical parameters and mechanical dimensions before integration. Ensure that the operating environment remains within the stated -20°C to +70°C range to maintain the specified ±30 ppm frequency tolerance. Cross-reference the 4-SMD package outline with PCB footprint requirements to guarantee proper solder joint formation and mechanical reliability during thermal cycling.

Crystals Selection Notes

Select this component when a 40 MHz reference with moderate stability is required for space-constrained designs. The 80 Ohm ESR value indicates suitability for standard oscillator circuits without excessive loading. Consider the ±30 ppm tolerance against system jitter requirements. The fundamental mode operation provides efficient energy conversion compared to overtone modes, simplifying circuit design for basic timing applications.

Crystals Part Context

This crystal belongs to Geyer Electronic America's standard SMD crystal lineup, which focuses on providing reliable frequency control solutions for consumer and industrial electronics. The company manufactures a broad range of quartz components, including oscillators and ceramic resonators. This specific model represents a common frequency point used in digital logic and communication interfaces requiring stable clock sources.

Crystals Replacement Considerations

Direct substitutes must match the 40 MHz frequency, 8 pF load capacitance, and 4-SMD package dimensions. Verify that alternative parts meet or exceed the ±30 ppm tolerance and 80 Ohm ESR specifications. Ensure the replacement supports fundamental mode operation and the same temperature range. Consult official manufacturer cross-reference lists for validated equivalents.