7A-8.000MBBK-T

Crystals Overview

The TXC Corporation 7A-8.000MBBK-T is a surface-mount quartz crystal resonator operating at a nominal frequency of 20 MHz, as documented in distributor specifications. It features a 50 ppm frequency stability and utilizes a 20 pF load capacitance. The component is housed in a compact 2-SMD package with dimensions of 5.00 mm x 3.20 mm and a maximum height of 1.35 mm. Designed for fundamental mode operation, it supports an operating temperature range of -20°C to +70°C and includes a typical equivalent series resistance (ESR) of 50 Ohms.

Crystals Feature Summary

• Glass-sealed construction provides enhanced environmental stress resistance compared to standard ceramic or resin packages.
• RoHS compliant design suitable for modern manufacturing processes, with lead content in the glass seal falling under regulatory exemptions.

Crystals Applications

• Portable USB data acquisition cards
• Personal Digital Assistants (PDAs)
• Digital cameras

Crystals Procurement Notes

Verify current availability status as this part number is listed as obsolete and no longer manufactured by TXC Corporation. Confirm that any replacement components meet the required electrical parameters, specifically the 20 MHz frequency, 20 pF load capacitance, and 50 ppm stability tolerance. Ensure the substitute device matches the 5x3.2 mm SMD footprint and operates within the specified -20°C to +70°C temperature range to maintain system reliability.

Crystals Selection Notes

Select this component for applications requiring high reliability in portable consumer electronics where thermal cycling resistance is critical. The glass-sealed technology mitigates frequency drift issues often encountered with ceramic packages during reflow soldering. Consider alternative sources due to the discontinued status, ensuring the replacement maintains identical mechanical dimensions and electrical characteristics for seamless integration into existing PCB layouts.

Crystals Part Context

This component belongs to the TXC 7A series, which specializes in 5x3.2 mm glass-sealed quartz crystals. This series is engineered to address frequency instability problems found in standard ceramic packages, particularly after multiple reflow cycles. The 7A series targets high-reliability portable devices, offering superior performance against moisture and mechanical shock compared to conventional SMD crystals.

Crystals Replacement Considerations

Publicly confirmed parameter-equivalent substitutes include the QT532G-20.000MBBK-T from QST. Verify that the replacement matches the 20 MHz frequency, 20 pF load capacitance, and 50 ppm stability. Ensure the physical footprint remains compatible with the original 5x3.2 mm SMD layout.