This document is a specification sheet for Aker-USA Quartz Crystal Unit HC-49/U-S-SMD product, which provides detailed information on the product's frequency, temperature range, mode of oscillation, load capacitance, etc.
The HC-49/U-S-SMD is a 4‑pad quartz crystal unit designed for high‑frequency applications. It meets RoHS requirements and is manufactured lead‑free (Pb - Lead Free).\n\nKey electrical specifications include a 20 MHz nominal frequency, 18 pF load capacitance, 40 Ω maximum ESR, and a frequency stability of +50 ppm over the extended temperature range of –40 °C to +85 °C. Mechanical dimensions are given in millimeters, and the part is supplied with a specific order code (1538800).
| Nominal Frequency | 20.000 MHz |
|---|---|
| Load Capacitance | 18 pF |
| Equivalent Series Resistance (ESR) | 40 Ω Max |
| Frequency Tolerance at 25°C | +30 ppm |
| Frequency Stability (Extended Temp) | +50 ppm Max |
| Operating Temperature Range (Extended) | -40 to +85 °C |
| Storage Temperature Range | -55 to +125 °C |
| Aging per Year | +3 ppm Max |
| Shunt Capacitance (Maximum) | 7 pF |
| Drive Level | 100 µW Typ – 500 µW Max |
| Solder Reflow Characteristics | +260 °C for 10 s Max |
The nominal frequency is 20.000 MHz.
Yes, it is RoHS compliant and lead‑free.
The load capacitance is 18 pF.
The maximum equivalent series resistance is 40 Ω.