The ECS-35-S crystal series from ECS Inc. International provides 3.579545 MHz crystals suitable for use in microprocessor applications. These crystals come in both Surface Mount Device (SMD) and Through-Hole (TH) configurations, making them versatile for a wide range of PCB designs. If you're working on embedded systems, these crystals are a common choice due to their frequency stability and reliability.

One thing worth noting is that these crystals offer excellent performance for clocking microprocessors, ensuring precise timing which is crucial for maintaining system stability and functionality. Engineers tend to reach for this frequency specifically because it’s a standard clock rate for many microcontrollers, particularly those used in digital cameras, smartphones, and other consumer electronics.

Another practical aspect is the availability in both SMD and TH formats. This dual availability allows designers to easily integrate these crystals into existing designs without having to redesign the entire board layout. For instance, if your project already has a TH pad layout, you can use the TH version; otherwise, the SMD variant is perfect for modern, space-constrained designs. Overall, the ECS-35-S crystals provide a reliable solution for maintaining accurate timing in microprocessor-based systems.