FA-238 18.4320MB-W

Crystals Overview

The EPSON FA-238 18.4420MB-W is a passive crystal oscillator designed for surface-mount applications. It operates at a nominal frequency of 18.432 MHz with a normal temperature frequency tolerance of ±50 ppm and stability of ±30 ppm over the operating range. The component features a load capacitance of 12 pF and an equivalent series resistance (ESR) of 80 Ohms maximum. It is housed in a compact 4-SMD, no lead package suitable for automated assembly. The device supports an operating temperature range from -20°C to +70°C, ensuring reliable performance in standard commercial environments.

Crystals Feature Summary

• Compact 4-SMD no-lead package design for space-constrained PCB layouts
• High frequency stability with ±30 ppm tolerance across operating temperature range
• Optimized low ESR of 80 Ohms for efficient circuit integration
• Reliable operation within standard commercial temperature limits

Crystals Applications

• Clock generation for microprocessors and microcontrollers
• Timing reference for communication interfaces such as UART and SPI
• Frequency standards for consumer electronic devices
• Synchronization circuits in industrial control systems

Crystals Procurement Notes

Verify the specific suffix 'W' against the manufacturer's official datasheet to confirm package dimensions and tape-and-reel specifications. Ensure the load capacitance requirement of the target circuit matches the 12 pF specification to maintain frequency accuracy. Cross-reference the ESR value of 80 Ohms with the oscillator driver circuit design to prevent overdriving or startup failures.

Crystals Selection Notes

Select this component when a precise 18.432 MHz reference is required for SMD assembly processes. The ±50 ppm initial tolerance suits general timing applications where high precision is not critical. Consider the 12 pF load capacitance compatibility with the host oscillator circuit. The -20°C to +70°C range defines the thermal boundary for reliable operation in non-industrial settings.

Crystals Part Context

The FA-238 series represents Epson's line of miniature passive crystals optimized for high-volume surface-mount production. This model utilizes a leadless design to enhance solder joint reliability and reduce profile height. The 18.432 MHz frequency is a standard choice for baud rate generation in serial communications, providing a common denominator for various data rates without fractional division errors.

Crystals Replacement Considerations

Direct substitutes must match the 18.432 MHz frequency, 12 pF load capacitance, 80 Ohm ESR, and 4-SMD no-lead package dimensions. Verify that alternative manufacturers offer identical ±50 ppm tolerance and -20°C to +70°C operating range. Ensure the replacement part maintains the same mechanical footprint to avoid PCB rework.