This document provides the specifications and characteristics of the HC-49/U-S-SMD - 4 Pad Quartz Crystal Unit product from Aker, based in Taiwan. It is a fundamental mode oscillator with good frequency stability and suitable for a wide operating temperature range. The product is RoHS compliant and lead-free.
The AKER CA4-3.6864-18-3050-X is a RoHS‑compliant quartz crystal unit designed for precise frequency control in electronic circuits. It is supplied in an HC‑49/U SMD package with four pads and meets lead‑free manufacturing standards.
Key electrical parameters include a nominal frequency of 3.6864 MHz, tight frequency tolerance, and robust temperature stability. Mechanical dimensions and solder reflow characteristics are also provided for reliable assembly.
| Nominal Frequency | 3.6864 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 |
| Aging per Year | +3 PPM Max |
| Load Capacitance | 18 |
| Shunt Capacitance (Maximum) | 7 pF |
| Equivalent Series Resistance (ESR) | 200 Ohms Max |
| Drive Level | 100 Typ - 500 Max µW |
| Solder Reflow Characteristics | +260 for 10 s Max °C |
The nominal frequency is 3.6864 MHz.
It operates from –40 °C to +85 °C (extended range).
The load capacitance is 18 (units as given).