This is a specification for a quartz crystal unit, including frequency, resonant frequency, operating temperature range, storage temperature range, aging per year, load capacitance, bypass capacitance, equivalent series resistance, drive level and soldering reflow characteristics.
The HC-49/U-S is a through‑hole quartz crystal unit offered by Aker. It complies with RoHS and is lead‑free, suitable for a range of electronic applications. The document provides detailed electrical and mechanical parameters, as well as reflow and temperature limits.
Key specifications include a nominal frequency of 11.0592 MHz, load capacitance of 18 pF, ESR up to 50 Ω, and an operating temperature range of –40 °C to +85 °C. Mechanical dimensions and solder reflow characteristics are also listed for design and manufacturing reference.
| Nominal Frequency | 11.0592 MHz |
|---|---|
| Mode of Oscillation | Fundamental |
| Frequency Tolerance at 25°C | +30 ppm |
| Frequency Stability over Temperature Range | +50 ppm Max |
| Operating Temperature Range (Extended) | -40 °C to +85 °C |
| Storage Temperature Range | -55 °C to +125 °C |
| Aging per Year | +3 ppm Max |
| Load Capacitance | 18 pF |
| Shunt Capacitance (Maximum) | 7 pF |
| Equivalent Series Resistance (ESR) | 50 Ω Max |
| Drive Level | 100 µW Typ – 500 µW Max |
| Solder Reflow Characteristics | +260 °C for 10 s Max |
The nominal frequency is 11.0592 MHz.
It operates from –40 °C to +85 °C.
The required load capacitance is 18 pF.