SIT3373AC-4B9-25NE491.520000

Oscillators Overview

The SIT3373AC-4B9-25NE491.520000 is a MEMS voltage-controlled oscillator (VCXO) from SiTime’s Elite Platform, operating at a nominal frequency of 491.52 MHz. It features HCSL output signaling and requires a 2.5V supply voltage. The device is housed in a compact 6-SMD, No Lead package with dimensions of 3.20mm x 2.50mm. Designed for low-jitter applications, it utilizes DualMEMS temperature sensing and TurboCompensation technology to ensure stability against thermal gradients, shock, and vibration. The component integrates on-chip regulators to filter power supply noise, eliminating the need for external LDOs.

Oscillators Feature Summary

• Integrates multiple on-chip regulators to filter power supply noise without requiring dedicated external LDOs
• Utilizes DualMEMS temperature sensing and TurboCompensation technology for resistance to airflow, thermal gradients, shock, and vibration
• Factory programmable for specific combinations of frequency, stability, voltage, output signaling, and pull range

Oscillators Applications

• Telecommunications systems requiring precise clocking
• Networking equipment demanding low-jitter differential signals
• Industrial applications operating in noisy environments with dynamic stressors

Oscillators Procurement Notes

Verify the complete part number including all suffixes to ensure correct output type, voltage, and frequency specifications. Confirm that the required pull range and stability meet the design requirements, as these are factory-programmed parameters. Check the datasheet for the specific reflow profile and tape and reel dimensions to ensure compatibility with automated assembly processes. Ensure the application environment falls within the specified operating temperature range.

Oscillators Selection Notes

Select this component when a differential VCXO with HCSL outputs is required in the 220 MHz to 725 MHz range. It is suitable for designs needing immunity to environmental stressors like vibration and thermal shifts. Consider this part if the system benefits from integrated power regulation to reduce bill-of-materials complexity. Verify that the 2.5V supply voltage aligns with the target platform's power architecture.

Oscillators Part Context

This model belongs to the SiT3373 series, which covers frequencies from 220 MHz to 725 MHz. It is part of SiTime’s Elite Platform, designed to replace quartz oscillators in high-performance applications. The series offers customizable pull ranges and output types, providing designers with flexibility to optimize clock configurations while avoiding long lead times associated with custom quartz devices.

Oscillators Replacement Considerations

Direct replacements must match the 491.52 MHz frequency, HCSL output, and 2.5V supply. Equivalent parts from other manufacturers may require different biasing or lack the same environmental robustness. Verify pinout compatibility and thermal characteristics before substitution.