This document describes the specifications and characteristics of a Quartz Crystal Unit HC-49/U-S-SMD - 4 Pad product, including frequency, temperature range, load capacitance, etc.
This document describes the AKER CA4-4.194304-18-3050-X quartz crystal, a HC‑49/U‑S‑SMD 4‑pad device operating at a nominal frequency of 4.194304 MHz. The crystal is designed for use in precision timing circuits and includes detailed electrical parameters such as load capacitance, ESR, and drive level.
The crystal complies with RoHS requirements (Pb‑free) and includes mechanical dimensions and solder reflow characteristics. It is suitable for operation from –40 °C to +85 °C (extended) and can be stored from –55 °C to +125 °C.
| Nominal Frequency | 4.194304 MHz |
|---|---|
| Frequency Tolerance at 25°C | +30 ppm |
| 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 (extended range).
Yes, the crystal is RoHS compliant and lead‑free.
The load capacitance is 18 pF.