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Product Detailed Parameters
- Description：3.2X2.5 SEAM SEAL MHZ QUARTZ XTA
- Series：QT325S
- Mfr：QST
- Package：Tape & Reel (TR)
- Type：MHz Crystal
- Frequency：25 MHz
- Frequency Stability：±30ppm
- Frequency Tolerance：±20ppm
- Load Capacitance：18pF
- ESR (Equivalent Series Resistance)：50 Ohms
- Operating Mode：Fundamental
- Operating Temperature：-40°C ~ 85°C
- Ratings：-
- Mounting Type：Surface Mount
- Package / Case：4-SMD, No Lead
- Size / Dimension：0.126" L x 0.098" W (3.20mm x 2.50mm)
- Height - Seated (Max)：0.031" (0.80mm)
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Overview
The QT325S-25.000MDHJ-T is a surface-mount quartz crystal oscillator manufactured by QST. It operates at a nominal frequency of 25 MHz with a load capacitance of 18 pF and an equivalent series resistance of 50 Ohms. The component utilizes a 4-SMD, no-lead package with dimensions of 3.2 x 2.5 mm. Frequency stability is specified at ±20 ppm at 25°C and ±30 ppm across the temperature range of -40°C to +85°C.
Feature Summary
- Seam seal construction for environmental protection
- Surface mount design for automated assembly
- High frequency stability across industrial temperature ranges
Applications
- Embedded communication systems
- Microcontroller clock sources
- Consumer electronics timing circuits
Procurement Notes
Verify the manufacturer designation carefully, as the QT325S series is produced by both TXC Corporation and QST. Ensure the specific suffix MDHJ-T matches the required stability and packaging specifications. Confirm that the supplier provides genuine components from the authorized QST supply chain to guarantee performance consistency.
Selection Notes
Select this component when a 25 MHz reference is required in a compact 3.2x2.5mm footprint. The ±20 ppm tolerance at room temperature suits applications needing precise timing. Consider the -40°C to +85°C operating range for industrial or automotive environments where standard commercial grades are insufficient.
Part Context
This part belongs to the QT325S family of thin-mode quartz crystals. These components are designed for high-frequency applications requiring small form factors. The series supports various load capacitances and stability grades, allowing designers to balance cost and performance requirements for different electronic products.
Replacement Considerations
Direct substitutes include other QT325S variants with identical 25 MHz frequency and compatible load capacitance. Verify that alternative parts match the 50 Ohm ESR and the 4-SMD no-lead package profile to ensure PCB compatibility without mechanical redesign.
