This document is the specification for the HC-49/U-S type crystal oscillator produced by Aker. The crystal oscillator has a frequency of 16.384 MHz and a frequency stability of ±50 ppm. The operating temperature range is -40 to +85 °C and the storage temperature range is -55 to +125 °C.
The HC-49/U-S quartz crystal unit from AKER is a through‑hole component designed for precise frequency control in electronic circuits. It complies with RoHS and is lead‑free, making it suitable for environmentally conscious designs.
Key specifications include a nominal frequency of 27 MHz, a load capacitance of 18 pF, and an ESR of 40 Ω max. The device operates from –40 °C to +85 °C (extended range) and can be stored from –55 °C to +125 °C. Mechanical dimensions are provided in millimetres, and the part is compatible with standard HC‑49/U‑S footprints.
| Nominal Frequency | 27.000 MHz |
|---|---|
| Frequency Tolerance (25 °C) | +30 ppm |
| Frequency Stability over Temperature | +50 ppm Max |
| Operating Temperature Range | -40 °C to +85 °C |
| Storage Temperature Range | -55 °C to +125 °C |
| Load Capacitance | 18 pF |
| Equivalent Series Resistance (ESR) | 40 Ω Max |
| Drive Level | 100 µW Typ – 500 µW Max |
| Solder Reflow Temperature | +260 °C for 10 s Max |
| Maximum Height (Mechanical) | 11.35 mm |
The nominal frequency is 27.000 MHz.
It requires a load capacitance of 18 pF.
It operates from –40 °C to +85 °C (extended range).
The ESR is limited to 40 Ω max.