AB-1.856MHZ-20-R700-B4

Overview

The Abracon AB-1.856MHZ-20-R700-B4 is a through-hole quartz crystal oscillator designed for general-purpose timing applications. It operates at a standard frequency of 1.856 MHz with a frequency tolerance of ±30 ppm and stability of ±100 ppm across the operating temperature range. The component features an HC-49/U package, measuring 11.5 mm in length, 5 mm in width, and 3.5 mm in height. It utilizes a load capacitance of 20 pF and exhibits a series resistance (ESR) of 700 Ohms. The device supports a minimum operating temperature of -20°C and a maximum of +70°C.

Feature Summary

• Provides stable oscillation at 1.856 MHz for microprocessor clock circuits
• Utilizes HC-49/U through-hole packaging for reliable board mounting
• Complies with RoHS and REACH environmental standards

Applications

• Microprocessor clock generation
• General-purpose timing circuits
• Embedded system control logic

Procurement Notes

Verify that the specific part number matches the required electrical parameters, particularly the 700 Ohm ESR and 20 pF load capacitance, as these differ from common low-impedance variants. Confirm compliance with project-specific environmental regulations such as RoHS and REACH. Ensure the HC-49/U package dimensions align with the target PCB footprint and clearance requirements before finalizing procurement.

Selection Notes

Select this component when a low-frequency, high-impedance crystal is required for through-hole assembly. The 700 Ohm ESR indicates suitability for specific oscillator circuits that cannot drive lower impedance loads. Consider the ±100 ppm stability requirement against the application's jitter sensitivity. The HC-49/U form factor offers robust mechanical stability compared to surface-mount alternatives.

Part Context

This component belongs to the Abracon ABL/AB series of general-purpose quartz crystals. It is distinct from the ABLS surface-mount series and higher-stability automotive-grade variants. The part is designed for commercial electronics rather than military or aviation applications, which require specialized qualification processes not included in this product line.

Replacement Considerations

Direct substitutes include other HC-49/U crystals with matching 1.856 MHz frequency, 20 pF load capacitance, and approximately 700 Ohm ESR. Verify that alternative manufacturers' parts meet the same ±30 ppm tolerance and -20°C to +70°C temperature range specifications.