This is a product specification document that introduces the brand, model, frequency, tolerance, temperature range, storage temperature range, annual aging, load capacitance, parallel capacitance, equivalent series resistance, drive level, reflow characteristics, etc. of the product.
The HC-49/U-SMD is a surface‑mount quartz crystal unit designed for precise frequency control in electronic circuits. It complies with RoHS standards and is lead‑free.
Key specifications include a nominal frequency of 24 MHz, frequency tolerance of ±30 ppm at 25 °C, and an extended operating temperature range from –40 °C to +85 °C. Electrical parameters such as load capacitance (18 pF), ESR (40 Ω max), and drive level (100 µW typ – 500 µW max) are also provided, along with mechanical dimensions in millimeters.
| Nominal Frequency | 24.000 MHz |
|---|---|
| Frequency Tolerance at 25°C | +30 ppm |
| Frequency Stability over Temperature Range | +50 ppm Max |
| Operating Temperature Range (Extended) | -40 to +85 °C |
| Storage Temperature Range | -55 to +125 °C |
| Aging per Year | +3 ppm Max |
| Load Capacitance | 18 pF |
| Shunt Capacitance (Maximum) | 7 pF |
| Equivalent Series Resistance (ESR) | 40 Ω Max |
| Drive Level | 100 µW typ – 500 µW Max |
| Solder Reflow Characteristics | +260 °C for 10 s Max |
The nominal frequency is 24.000 MHz.
It operates from –40 °C to +85 °C (extended range).
The load capacitance is 18 pF.