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Product Detailed Parameters
- Description：3.2X2.5 30PPM @25C 30PPM (-40 TO
- Series：QT325S
- Mfr：QST
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：MHz Crystal
- Frequency：27.12 MHz
- Frequency Stability：±30ppm
- Frequency Tolerance：±30ppm
- 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-27.120MAHJ-T is a quartz crystal resonator manufactured by QST, designed for surface-mount applications. It operates at a nominal frequency of 27.12 MHz with a frequency tolerance and stability of ±30ppm. The component features a load capacitance of 18pF and an equivalent series resistance (ESR) of 50 Ohms. It utilizes a fundamental oscillation mode and is housed in a compact 4-SMD, No Lead package measuring 3.2mm x 2.5mm x 0.7mm. The device supports operation within a temperature range of -40°C to +85°C and complies with RoHS standards.
Feature Summary
- Fundamental mode quartz crystal resonator for stable frequency generation
- Compact 3.2mm x 2.5mm surface-mount package for automated assembly
- Wide operating temperature range suitable for industrial environments
Applications
- Embedded communication systems requiring 27.12 MHz clock signals
- Industrial control circuits operating in wide temperature ranges
- Consumer electronics utilizing surface-mount technology
Procurement Notes
Verify the specific suffix 'HJ-T' against official QST documentation to confirm the 18pF load capacitance and 50 Ohm ESR specifications. Ensure that the selected variant matches the required thermal grade for -40°C to +85°C operation. Cross-reference the manufacturer part number with authorized distributors to confirm current availability and compliance status.
Selection Notes
Select this component when a 27.12 MHz fundamental resonance is required with strict ±30ppm stability limits. The 18pF load capacitance must match the oscillator circuit design parameters. Consider the 50 Ohm ESR value for drive level sensitivity and power consumption constraints in low-power embedded designs.
Part Context
This component belongs to the QT325S series of ceramic and quartz crystals from QST. The series is characterized by small form factors and high reliability for SMD mounting. The 27.12 MHz frequency is commonly used in wireless transmission and data communication interfaces.
Replacement Considerations
The TXC Corporation part QT325S-27.120MAHJ-T is listed as a substitute. Verify that the replacement maintains identical electrical parameters, specifically the 18pF load capacitance and 50 Ohm ESR, before implementation.
