AS-25.000-18-F-SMD-TR

Crystals Overview

The AS-25.000-18-F-SMD-TR is a surface-mount quartz crystal resonator manufactured by Raltron Electronics, designed for microprocessor clock applications. It operates at a nominal frequency of 25 MHz with a fundamental oscillation mode. The component features a maximum frequency tolerance of ±30 ppm at 25°C and a total frequency stability of ±50 ppm across the operating temperature range. It supports an extended industrial temperature range from -40°C to +85°C. Key electrical specifications include a load capacitance of 18 pF, a maximum equivalent series resistance (ESR) of 40 Ω, and a maximum drive level of 500 μW. The unit has a low-profile SMD package height of 3.8 mm.

Crystals Feature Summary

• Low-profile surface mount design suitable for compact PCB layouts
• Extended industrial temperature operation capability
• Standard lead-free soldering process compatibility
• Moisture sensitivity level 1 classification

Crystals Applications

• Microprocessor main clock generation
• Ethernet PHY reference clock sources
• Industrial IoT gateway timing circuits
• Consumer electronic device control systems

Crystals Procurement Notes

Verify that the specific part number matches the required load capacitance and temperature grade for your application. Confirm compliance with RoHS and REACH regulations if exporting. Check incoming inventory dates using the silk-screen date code to avoid aged stock. Ensure PCB layout accounts for parasitic capacitance when selecting matching capacitors.

Crystals Selection Notes

Select this component for general-purpose MCU and communication interfaces requiring standard stability. Verify that the driving power remains within the specified maximum limit to prevent aging issues. Consider the ESR value to ensure reliable startup with the target oscillator circuit. Evaluate the thermal environment to confirm the extended temperature range meets operational requirements.

Crystals Part Context

This part belongs to the AS-SMD series of low-profile quartz crystals. It is engineered for high-volume SMT production lines. The series offers various frequency and load capacitance options. It targets cost-sensitive consumer and industrial electronics markets. The design prioritizes reliability and ease of integration into standard manufacturing processes.

Crystals Replacement Considerations

Direct substitutes must match the 25 MHz frequency, 18 pF load capacitance, and SMD package dimensions. Verify equivalent ESR and drive level specifications. Cross-reference manufacturer datasheets for pinout and mounting compatibility. Ensure alternative parts meet the same environmental and regulatory standards.