This file is about the specification of CA4-18.432-18-3050-X Quartz Crystal Unit HC-49/U-S-SMD - 4 Pad.
The AKER HC-49/U-SMD quartz crystal unit is a surface‑mount component designed for precise frequency generation in electronic circuits. It is RoHS compliant and lead‑free, suitable for a wide range of temperature conditions.
Key electrical parameters include a nominal frequency of 18.432 MHz, a frequency tolerance of +30 ppm at 25 °C, and a stability of +50 ppm over temperature. Mechanical dimensions are provided in millimetres, and the part meets standard solder‑reflow specifications.
| Nominal Frequency | 18.432 MHz |
|---|---|
| Frequency Tolerance (25 °C) | +30 ppm |
| Frequency Stability over Temperature | +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) | 40 Ω Max |
| Drive Level | 100 µW Typ – 500 µW Max |
| Solder Reflow Characteristics | +260 °C for 10 s Max |
The nominal frequency is 18.432 MHz.
It operates from –40 °C to +85 °C.
The load capacitance is 18 pF.
Yes, the crystal unit is RoHS compliant and lead‑free.