This document describes the product specification of the HC-49/U-S-SMD Quartz Crystal Unit produced by Aker. It is a 32.000 MHz fundamental mode oscillator with a frequency tolerance of ±30 PPM and a frequency stability of ±50 PPM over the temperature range.
The HC-49/U-S-SMD quartz crystal unit from AKER is a surface‑mount crystal designed for precise frequency generation in electronic circuits. It complies with RoHS and is lead‑free, making it suitable for modern, environmentally‑friendly designs.
Key specifications include a nominal frequency of 32 MHz, load capacitance of 18 pF, ESR up to 40 Ω, and operating temperature range from –40 °C to +85 °C. Mechanical dimensions are given in millimetres, and the part can withstand a solder reflow of up to 260 °C for 10 seconds.
| Nominal Frequency | 32.000 MHz |
|---|---|
| Frequency Tolerance at 25°C | +30 ppm |
| Frequency Stability over Temperature Range | +50 ppm Max |
| Operating Temperature Range | -40 to +85 °C |
| Storage Temperature Range | -55 to +125 °C |
| 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 32.000 MHz.
It requires a load capacitance of 18 pF.
The unit operates from –40 °C to +85 °C.