The HC-49USX is a low-profile, resistance-welded through-hole quartz crystal designed for stable frequency generation in electronic circuits. It is housed in a standard through-hole package with dimensions specified for the HC-49USX form factor. The device operates over a temperature range of -10°C to +70°C with a frequency stability of ±50 ppm and a frequency tolerance of ±30 ppm at +25°C. It supports fundamental mode oscillation up to 30 MHz and third overtone operation from 27 MHz to 70 MHz, with maximum equivalent series resistance ranging from 100 Ω to 200 Ω depending on frequency. The crystal is rated for a maximum drive level of 500 μW, has a shunt capacitance of 7 pF, and is RoHS compliant with MSL 1 moisture sensitivity rating. Load capacitance is user-specified via part number. The soldering profile allows up to two cycles at a peak temperature of +260°C for a maximum of 10 seconds.
Despite the rise in popularity of surface mount technology (SMT) in passive components, through hole packaging has remained an industry staple for eight decades for a reason. The simplicity and efficacy of this technology, along with its ability to be incorporated into a vast array of designs, make it an excellent choice for many different applications.
Crystals with through hole packing are ideal for larger components that will undergo a significant amount of mechanical stress, high voltage, and/or high power. This is because through hole soldering results in a stronger bond between the passive components and the circuit board. Example applications include transformers, connectors, semiconductors and electrolytic capacitors.
Other advantages to using through hole-mounted components include the compact design to decrease the component’s footprint on the circuit board, exceptional shock and vibration resistance, low frequencies and options for industrial temperature ranges and excellent aging and component longevity and durability.
3.579545MHz ±30ppm Crystal 18pF 200 Ohms HC-49/US
| ECS Inc. International | DigiKey | Shenzhen Shengyu Electronics Technology Limited | |
|---|---|---|---|
| Product Category | Crystals | Crystals | Crystals |
| Product Number | ECS-35-18-4XEN | XC1734-ND | ECS-35-18-4XEN |
| Product Name | Through Hole Crystals | Crystals | Crystals |
| Package / Form Factor | Through Hole Crystals | Through Hole; HC-49/US | Through Hole |
| Features / Standards | RoHS | Lead-Free | |
| Frequency | 3.58 MHz | 3.58 MHz | |
| Frequency Stability | 50 ppm | 50 ppm |
