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Product Detailed Parameters
- Description：2.0X1.6 SEAM SEAL MHZ QUARTZ XTA
- Series：QT216S
- Mfr：QST
- Package：Tape & Reel (TR)
- Type：MHz Crystal
- Frequency：40 MHz
- Frequency Stability：±30ppm
- Frequency Tolerance：±30ppm
- Load Capacitance：-
- 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：0.079" L x 0.063" W (2.00mm x 1.60mm)
- Height - Seated (Max)：0.020" (0.50mm)
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Overview
The QT216S-40.000MAHJ-T is a quartz crystal resonator manufactured by QST, operating at a fundamental frequency of 40 MHz. It features a surface-mount package with dimensions of 2.0 mm x 1.6 mm x 0.5 mm. The component has a load capacitance of 18 pF and an equivalent series resistance of 90 Ohms. Frequency stability is specified at ±30 ppm at 25°C and ±30 ppm over the temperature range of -40°C to +85°C.
Feature Summary
- Seam-sealed SMD construction for environmental protection
- High frequency stability across industrial temperature ranges
- Compact footprint suitable for space-constrained designs
Applications
- Microcontroller clock sources
- Communication module timing references
- Industrial control system oscillators
Procurement Notes
Verify the manufacturer designation on the datasheet, as some listings may attribute this part number to TXC Corporation despite the QST model prefix. Confirm the specific suffix 'MAHJ' matches the required load capacitance and tolerance specifications before ordering. Ensure the package outline drawing aligns with the PCB footprint requirements for the 2.0x1.6mm form factor.
Selection Notes
Select this component when a 40 MHz reference is required in a small surface-mount package. The 18 pF load capacitance must match the oscillator circuit design. Consider the ±30 ppm stability requirement against the system's timing accuracy needs. The industrial temperature range supports operation in varied environmental conditions without additional derating.
Part Context
This part belongs to the QT216S series of seam-sealed quartz crystals. The series offers various frequencies with consistent 2.0x1.6mm packaging. Similar parts in the family include different frequency variants like the 24 MHz or 26 MHz versions, maintaining identical electrical characteristics and physical dimensions.
Replacement Considerations
Direct substitutes include other manufacturers offering 40 MHz crystals in 2.0x1.6mm packages with 18 pF load capacitance and ±30 ppm stability. Verify pin compatibility and mounting pad layout before swapping suppliers.
