SIT3821AI-2B2-XXXX000.FP0000X

Overview

The SiTime SIT3821AI-2B2-XXXX000.FP0000X is a field-programmable MEMS VCXO oscillator designed for high-performance timing applications. It operates within a frequency range of 1 MHz to 220 MHz and supports supply voltages of 2.5 V and 3.3 V. The device features LVPECL output signaling with enable/disable functionality. Total frequency stability is specified at ±25 ppm across the operating temperature range. The component is housed in a compact 6-SMD, No Lead package, offering a drop-in replacement solution for legacy quartz oscillators while providing programmable drive strength to optimize system EMI.

Feature Summary

• Field-programmable MEMS technology enables custom frequency configuration without hardware changes
• LVPECL output interface provides high-speed signal integrity with enable/disable control
• Compact 6-SMD no-lead package facilitates space-constrained PCB layouts
• Supports dual voltage operation for flexible power domain integration

Applications

• High-speed serial communication interfaces requiring precise clock synchronization
• Telecommunications equipment utilizing VCXO-based phase adjustment
• Test and measurement instruments demanding low jitter programmable clocks
• Industrial networking devices replacing legacy quartz oscillators

Procurement Notes

This part number represents an unprogrammed blank device intended for field programming by the end user or manufacturer. Verify that the specific application requires a programmable variant rather than a fixed-frequency oscillator. Ensure compatibility with SiTime's Time Machine II programmer or equivalent configuration tools before procurement. Confirm that the required frequency and stability specifications fall within the supported 1 MHz to 220 MHz range during the design phase.

Selection Notes

Select this model when design flexibility for frequency tuning is required post-manufacturing. The ±25 ppm total stability suits applications tolerant of moderate drift compared to oven-controlled variants. The LVPECL output is appropriate for differential signaling paths requiring robust noise immunity. Consider the 6-SMD package dimensions against available board real estate. This series replaces specific quartz models; verify pinout and electrical compatibility with existing circuit designs before adoption.

Part Context

The SIT3821AI belongs to SiTime’s SiT3821 family of MEMS VCXOs, which are engineered for applications needing voltage-controlled frequency adjustment. These devices utilize silicon resonator technology to replace traditional quartz components, offering superior shock resistance and lower sensitivity to environmental factors. The AI suffix typically denotes industrial temperature range performance, ensuring reliable operation across extended thermal conditions common in enterprise and infrastructure environments.

Replacement Considerations

Public confirmed substitute part numbers include SIT3821AI-1B2-XXXX000.FP0000X and SIT3821AI-2C2-XXXX000.FP0000X from the same SiT3821 family. These variants share identical packaging and core MEMS architecture but may differ in specific electrical characteristics or temperature grades. Verify exact parameter alignment before substitution.