This document describes the electrical and mechanical specifications of the Quartz Crystal Unit HC-49/U-S-SMD - 4 Pad product from AKER-USA, including frequency, temperature range, load capacitance, and solder reflow characteristics.
The AKER CA4-4.194304-18-3050-X is a HC-49/U-S-SMD quartz crystal unit designed for precise frequency control in electronic circuits. It complies with RoHS and is lead‑free.
Key specifications include a nominal frequency of 4.194304 MHz, load capacitance of 18 pF, ESR up to 120 Ω, and an operating temperature range of –40 °C to +85 °C. Mechanical dimensions are provided in millimetres for PCB layout.
| Nominal Frequency | 4.194304 MHz |
|---|---|
| Frequency Tolerance at 25°C | +30 |
| Frequency Stability over Temperature Range | +50 PPM Max |
| Operating Temperature Range (Extended) | -40 to +85 °C |
| Storage Temperature Range | -55 to +125 °C |
| Aging per Year | +3 PPM Max |
| Load Capacitance | 18 pF |
| Shunt Capacitance (Maximum) | 7 pF |
| Equivalent Series Resistance (ESR) | 120 Ω Max |
| Drive Level | 100 µW Typ – 500 µW Max |
| Solder Reflow Characteristics | +260 °C for 10 s Max |
The nominal frequency is 4.194304 MHz.
It operates from –40 °C to +85 °C.
The required load capacitance is 18 pF.
The part number is CA4-4.194304-18-3050-X.