QT532S-25.000MAHJ-T

Overview

The QT532S-25.000MAHJ-T is a quartz crystal resonator manufactured by QST, operating at a fundamental frequency of 25 MHz. It features a frequency stability and tolerance of ±30 ppm across the commercial temperature range of -40°C to +85°C. The component utilizes a load capacitance of 18 pF and exhibits an equivalent series resistance (ESR) of 40 Ohms. Designed for surface-mount technology, it is housed in a compact 4-SMD, no-lead package with dimensions of 5.0 mm x 3.2 mm x 0.9 mm.

Feature Summary

• Seam seal construction utilizing ceramic materials for enhanced environmental protection
• Surface-mount design compatible with automated pick-and-place assembly processes
• Stable frequency performance maintained within specified limits over extended temperature ranges

Applications

• Microcontroller clock source generation
• Communication interface timing synchronization
• Digital signal processing circuit oscillators

Procurement Notes

Verify the manufacturer designation on official documentation, as this part number appears associated with both QST and TXC Corporation in distributor listings. Confirm that the specific datasheet provided matches the required 40 Ohm ESR and 5.0x3.2mm package dimensions. Ensure the selected variant meets the -40°C to +85°C operating temperature specification required for the target application environment.

Selection Notes

Select this component when a 25 MHz reference signal is required for space-constrained designs. The 18 pF load capacitance must align with the oscillator circuit's input capacitance requirements. Consider the 40 Ohm ESR value to ensure adequate drive level management, typically limited to 50 uW, preventing frequency drift or mechanical damage to the quartz element during operation.

Part Context

This crystal belongs to the seam-seal SMD family, offering superior hermeticity compared to standard epoxy-sealed packages. The 4-SMD no-lead configuration facilitates low-profile mounting on printed circuit boards. It serves as a critical timing element in digital systems requiring precise clock signals without the bulk of through-hole alternatives.

Replacement Considerations

The 7M-25.000MAHJ-T from TXC Corporation is a documented alternative with identical 25 MHz frequency and 18 pF load capacitance. However, verify if the TXC variant's 60 Ohm ESR is acceptable for the existing oscillator circuit, as it differs from the QST part's 40 Ohm specification.