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Product Detailed Parameters
- Description：HC49 SMD MHZ QUARTZ XTAL / METAL
- Series：QT49S
- Mfr：QST
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：MHz Crystal
- Frequency：12 MHz
- Frequency Stability：±30ppm
- Frequency Tolerance：±30ppm
- Load Capacitance：18pF
- ESR (Equivalent Series Resistance)：40 Ohms
- Operating Mode：Fundamental
- Operating Temperature：-40°C ~ 85°C
- Ratings：-
- Mounting Type：Surface Mount
- Package / Case：HC-49/US
- Size / Dimension：0.449" L x 0.189" W (11.40mm x 4.80mm)
- Height - Seated (Max)：0.161" (4.10mm)
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Overview
The QT49S-12.000MAHJ-T is a quartz crystal resonator manufactured by QST, operating at a fundamental frequency of 12 MHz. It features a frequency stability and tolerance of ±30 ppm at 25°C. The component utilizes an HC-49/US surface-mount package with dimensions of 12.7 mm length, 4.8 mm width, and 3.8 mm height. It has a load capacitance of 18 pF and an equivalent series resistance (ESR) of 40 Ohms. The device operates within a temperature range of -20°C to +70°C and is RoHS3 compliant.
Feature Summary
- Fundamental mode operation for stable frequency generation
- Surface-mount HC-49/US package design for automated assembly
- ±30 ppm frequency stability across specified temperature range
Applications
- Microcontroller clock sources
- Communication module timing references
- Digital signal processing circuits
Procurement Notes
Verify the specific suffix MAHJ-T against official QST documentation to confirm package type and tolerance specifications. Ensure compatibility with existing PCB footprints designed for HC-49/US SMD components. Cross-reference manufacturer datasheets for updated environmental compliance status and recommended soldering profiles prior to integration into production designs.
Selection Notes
Select this component when a 12 MHz fundamental frequency with ±30 ppm stability is required in a compact surface-mount form factor. The HC-49/US SMD package offers a balance between size and performance suitable for space-constrained applications. Consider the 40 Ohm ESR value for oscillator circuit design to ensure reliable startup and sustained oscillation within the target temperature range.
Part Context
This part belongs to the QT49S series of quartz crystals from QST, which are designed for general-purpose timing applications. The series provides various frequency options within the standard HC-49/US SMD footprint. These components are widely used in consumer electronics and industrial control systems where moderate frequency accuracy and reliability are essential requirements.
Replacement Considerations
Public confirmed substitute: QT49S-12.000MEEJ-T (QST). Note that MEEJ-T variants may differ in frequency tolerance or stability specifications compared to the MAHJ-T version. Verify electrical parameters match before substitution.
