603-40-48

Crystals Overview

The Fox Electronics 603-40-48 is a surface-mount ceramic crystal oscillator operating at a fundamental frequency of 40.000 MHz. It features a 12 pF load capacitance and a maximum equivalent series resistance (ESR) of 30 Ohms. The component supports a wide industrial temperature range from -40°C to +85°C with a frequency tolerance of ±20 ppm across the full range. Packaged in a compact 4-SMD, no-lead form factor, it is RoHS and REACH compliant without exemptions, ensuring suitability for global regulatory standards.

Crystals Feature Summary

• Fundamental mode operation eliminates the need for overtone suppression circuitry
• Industrial-grade thermal stability ensures consistent performance in harsh environments
• Low ESR facilitates direct driving by standard microcontroller internal oscillators

Crystals Applications

• Industrial gateway main control clocking
• Outdoor equipment requiring wide temperature resilience
• Industrial control boards and non-safety automotive domains

Crystals Procurement Notes

Verify that the specific order matches the updated C3BS series designation rather than legacy FX325BS nomenclature, although pin-to-pin compatibility remains intact. Confirm compliance documentation explicitly states no exemptions for RoHS/REACH directives prior to finalizing procurement for export markets. Ensure the 12pF load capacitance aligns with the target circuit design requirements.

Crystals Selection Notes

Select this component when a fundamental frequency crystal is required to simplify clock circuit design. The low ESR specification allows direct integration with popular MCU families like STM32 or i.MX RT without additional amplification stages. The wide temperature range makes it suitable for applications exposed to significant thermal fluctuations, provided the ±20 ppm tolerance meets the system's timing accuracy constraints.

Crystals Part Context

This part belongs to the C3BS series, formerly known as FX325BS. It represents a modernized version of a widely used industrial crystal, maintaining physical and electrical compatibility with previous iterations. The series is characterized by its robust ceramic construction and reliability in demanding electronic environments, serving as a drop-in replacement for older designs while meeting current environmental regulations.

Crystals Replacement Considerations

The 603-40-48 is functionally equivalent to the legacy FX325BS series parts. No alternative manufacturer part numbers are confirmed in the provided data; substitution should be limited to the same Fox Electronics series to ensure parameter consistency.