Understanding FSC 5955: Oscillators and Piezoelectric Crystals

Quartz-based frequency control components are integral to modern electronics, and those classified under Federal Supply Class (FSC) 5955 play a central role in precision timing, signal generation, and frequency stabilization across countless industries. This FSC encompasses piezoelectric crystal units and oscillators engineered to harness the uniquely stable properties of quartz for applications ranging from telecommunications devices to aerospace systems. This blog will delve into all that you need to know about FSC 5955, providing insight into the parts it encompasses and their uses.

What Is FSC 5955?

FSC 5955 specifically categorizes oscillators and piezoelectric crystals, including crystal units and processed unmounted crystals, all of which assist in frequency control and signal generation. It is important to note that this class focuses on standalone piezoelectric elements and oscillators that rely on the intrinsic properties of quartz to generate and regulate frequencies, excluding crystal-controlled and non-crystal-controlled oscillators that are classified as complete electronic modules which fall under FSC 5963. This distinction directly contributes to a more efficient and targeted procurement process for government agencies and industry professionals alike.

Key Part Types Within FSC 5955

Piezoelectric Crystal Units

Piezoelectric crystal units leverage the piezoelectric effect, which is the ability of certain crystals to generate an electric charge when subjected to mechanical stress. These crystals are carefully cut and manufactured to resonate at specific frequencies, with their physical properties directly influencing their performance. With this in mind, their designs vary in shape, size, and crystal cut to meet different operational demands, the most common cut options including:

AT-Cut Crystals: These crystals are prized for their excellent frequency stability over a broad temperature range. They are typically cut at an angle of approximately 35 degrees to the quartz crystal’s optical axis, optimizing their thermal characteristics and making them ideal for precision timing applications–such as in quartz watches, telecommunications systems, and GPS devices.
BT-Cut Crystals: BT-cut crystals are cut at around 49 degrees to the quartz optical axis, giving them a different thermal response than AT-cuts. They are often used in applications where resistance to temperature fluctuations is less critical, such as lower-cost frequency control circuits or non-precision oscillators. However, they are still suitable for many industrial and commercial electronic applications.
SC-Cut Crystals: Known for their exceptional frequency stability, SC-cut crystals are designed specifically for high-precision applications. They are cut at a unique 35°15' angle to the crystal’s Z-axis, which minimizes stress and thermal fluctuations by reducing mechanical coupling and frequency drift. Their superior performance comes at the cost of more complex manufacturing processes, but their ability to maintain accuracy in demanding conditions makes them perfect for space applications, advanced communication systems, and generally meeting laboratory-grade frequency standards.

Processed Unmounted Crystals

Processed unmounted crystals are raw piezoelectric elements that have undergone precision shaping and preparation, but remain unmounted for customization. These crystals are the foundation for many specialized frequency control devices, where standard pre-packaged crystal units would be unsuitable. As a result of their flexibility in application, they are frequently used in laboratory research, custom oscillators, and experimental electronic circuits requiring precise frequency control.

Oscillators (Non-Module)

While module-based crystal oscillators are classified under FSC 5963, oscillators in FSC 5955 include standalone circuits that integrate piezoelectric crystals without being categorized as complete modules. These oscillators exploit the resonant properties of quartz crystals to generate stable electronic signals, often serving as essential timing elements in electronic systems. Their designs vary depending on the intended function; for instance, some employ simple feedback loop circuits, while others incorporate additional components to enhance output precision.

A Strategic Sourcing Platform for FSC 5955 Items

For those seeking high-quality oscillators and piezoelectric crystals, ASAP Aviation Unlimited provides a vast selection sourced from trusted manufacturers. Our platform offers access to a diverse inventory of products, ensuring that you can find exactly what your operations need. More than that, we offer competitive pricing and timely delivery along with solutions tailored to your unique requirements, so explore our website and get started on procuring all that you need today.