SIT9505

MEMS Differential Oscillators | Ultra-Low Jitter SiT9505 Series

Core Advantages

• Ultra-Low 41 fs Phase Jitter: Industry-leading typical phase jitter of just 41 fs (12 kHz–20 MHz integration bandwidth) ensures superior signal integrity, dramatically reducing bit error rates (BER) in 400G/800G high-speed serial links and optical transceivers.
• 20× Better Shock & Vibration Immunity: SiT9505 leverages SITIME's proprietary MEMS resonator technology to deliver 20× higher shock and vibration resistance compared to traditional quartz-based oscillators. It maintains stable operation under harsh mechanical stress, strong electromagnetic interference, and rapid temperature transients — eliminating field failures caused by quartz resonator fracture.
• Extremely Low Power Supply Noise Sensitivity: With a best-in-class 0.01 ps/mV Power Supply Noise Rejection (PSNR), the SiT9505 virtually eliminates power-induced jitter — greatly simplifying power distribution network (PDN) design and decoupling requirements versus quartz oscillators that are far more sensitive to supply rail noise.
• Semiconductor-Grade Supply Stability: Unlike quartz oscillators that depend on naturally mined crystals with multi-month lead times and process variability, the SiT9505 is fabricated on silicon MEMS semiconductor processes — ensuring consistent quality, wafer-level traceability, and stable, predictable lead times without supply disruptions.
• Ultra-Compact, Design-Flexible Packaging: Available in industry-standard footprints as small as 2.0×1.6 mm, with support for multiple differential output types (LVDS, LVPECL, HCSL) and a wide supply voltage range of 1.8V–3.3V — drop-in compatible with existing quartz oscillator layouts while saving precious PCB real estate.

Product Introduction

The SiT9505 is a premium ultra-low jitter differential MEMS oscillator from SITIME, purpose-built for the most demanding high-speed communication and data center applications. Leveraging SITIME's field-proven silicon MEMS resonator platform, the SiT9505 achieves a typical integrated phase jitter of merely 41 fs (12 kHz to 20 MHz), making it an ideal timing reference for 400G/800G Ethernet PHYs, PAM4 SerDes, coherent optical DSPs, and next-generation AI/ML accelerator interconnects.

The device delivers frequency stability of ±10 ppm across commercial and industrial temperature ranges, with outstanding frequency stability maintained even under rapid thermal transients, airflow, and mechanical vibration — conditions where traditional quartz oscillators often exhibit significant frequency perturbations. Its silicon MEMS construction provides inherent immunity to microphonics, resonator aging, and activity dips that plague quartz-based designs.

With an industry-standard footprint as compact as 2.0×1.6 mm, the SiT9505 supports LVDS, LVPECL, and HCSL differential output signaling formats and operates across a flexible 1.8V to 3.3V supply range — making it a drop-in replacement for conventional 6-pin and 4-pin differential quartz oscillators without PCB layout changes. The device is fully RoHS and REACH compliant, manufactured under ISO 9001 quality systems, and backed by SITIME's industry-leading reliability pedigree with over 3 billion MEMS timing devices shipped.

Available through Yuanqimao Electronics (YQM) with local technical support, fast sample delivery, and competitive pricing, the SiT9505 is the go-to choice for system architects seeking to eliminate quartz-related reliability risks while achieving best-in-class jitter performance in space-constrained high-speed designs.

Alternative Products and Reasons

• High-Frequency Differential Quartz Oscillator Series — Various manufacturers offering LVDS/LVPECL quartz XO solutions in 3.2×2.5mm, 5.0×3.2mm, and 7.0×5.0mm packages for data center and telecom timing applications.

Replacement Reasons:

1. Superior Reliability Under Stress: SITIME MEMS technology provides approximately 20× better shock and vibration resistance compared to traditional quartz oscillators. In harsh operating environments — such as high-vibration data center rack deployments, industrial control cabinets, and aerospace electronics — quartz resonators are prone to mechanical fracture and activity dips, whereas the SiT9505 maintains stable, uninterrupted oscillation.

2. Drastically Lower Power Supply Noise Sensitivity: The SiT9505 exhibits a power supply noise rejection (PSNR) of only 0.01 ps/mV, effectively decoupling timing jitter from power rail fluctuations. Traditional quartz differential oscillators are significantly more sensitive to PDN noise, often requiring additional LDO regulators, ferrite beads, and decoupling capacitors — adding BOM cost and PCB area while complicating layout.

3. Stable, Predictable Semiconductor Supply Chain: Quartz crystal blanks are a natural resource subject to mining yield variability, geopolitics, and prolonged manufacturing lead times (often 12–20 weeks or longer). MEMS-based oscillators like the SiT9505 are fabricated on fully automated 200mm silicon wafer processes with consistent yields and predictable 4–8 week lead times — eliminating single-source bottlenecks and keeping production lines running.

Key Features

• Phase Jitter Performance: Typical integrated RMS phase jitter of 41 fs (12 kHz–20 MHz), ensuring superior signal-to-noise ratio and margin for 56Gbps/112Gbps PAM4 SerDes lanes in high-speed communication systems.
• Frequency Range & Stability: Supports output frequencies from 1 MHz to 725 MHz with ±10 ppm frequency stability over operating temperature range; excellent total frequency stability maintained across thermal transients, airflow, and mechanical stress.
• Differential Output Options: Factory-configurable for LVDS, LVPECL, and HCSL differential signaling standards — one platform covers multiple end-application interface requirements without re-qualification.
• Wide Supply Voltage Range: Supports 1.8V, 2.5V, and 3.3V supply rails, enabling seamless integration into mixed-voltage board designs without external level translation.
• Compact Package Options: Industry-standard footprints including 2.0×1.6 mm, 2.5×2.0 mm, 3.2×2.5 mm, 5.0×3.2 mm, and 7.0×5.0 mm — drop-in PCB-compatible with conventional quartz differential XO layouts.
• Shock & Vibration Resistance: MEMS resonator construction provides 20× higher resistance to shock (tested to 50,000 g) and vibration (tested to 70 g RMS, 10 Hz–2 kHz) versus quartz equivalents — eliminates field failures due to cracked crystal blanks.
• Power Supply Noise Rejection: Industry-best 0.01 ps/mV PSNR minimizes power-induced jitter, reducing the need for ultra-low-noise LDOs and dense decoupling networks — saving BOM cost and PCB area.
• Quality & Environmental Compliance: Fully RoHS and REACH compliant; manufactured in ISO 9001 and IATF 16949 certified facilities; backed by SITIME's billions-of-units-shipped reliability track record with<1 DPPM field failure rates.

Applications

• High-Speed Optical Networking: Precision timing reference for 400G/800G Ethernet PHYs, PAM4 DSP-based optical transceivers (QSFP-DD, OSFP, CFP2), coherent optics, and OTN line cards — where ultra-low 41 fs jitter directly translates to superior link margin and lower BER.
• Data Center & AI/ML Infrastructure: Clock source for high-performance server CPU/PCIe Gen5/Gen6 reference clocks, HPC interconnect fabrics, NVLink/NVSwitch timing, AI training/inference accelerator cards (GPU, ASIC, FPGA), and NVMe storage arrays — enabling maximum compute throughput with deterministic timing.
• Test & Measurement Equipment: Low-noise reference oscillator for high-bandwidth oscilloscopes, spectrum/signal analyzers, bit error rate testers (BERT), vector network analyzers, and precision RF signal generators — where ultra-low phase noise and jitter directly determine measurement accuracy.
• Industrial Automation & Control: Reliable timing for high-performance industrial computers (IPC), PLCs, distributed I/O systems, and motion controllers operating in harsh factory-floor environments — where 20× vibration immunity and wide temperature stability ensure uninterrupted operation.
• Aerospace & Defense Electronics: Mission-critical timing for avionics, radar signal processing, SATCOM terminals, and guidance/navigation systems — leveraging the SiT9505's 50,000 g shock survivability, 70 g vibration tolerance, and inherent hermetic MEMS reliability in extreme operating environments.
• 5G Wireless & IoT Infrastructure: Precision clocking for 5G baseband units (BBU), remote radio units (RRU), edge computing gateways, and high-speed wireless backhaul equipment — providing clean, low-jitter timing for CPRI/eCPRI and JESD204B/C data converter interfaces.

Certifications

RoHS, REACH compliant. Manufactured under ISO 9001 and IATF 16949 certified quality management systems. SITIME MEMS timing devices with over 3 billion units shipped and field-proven<1 DPPM reliability.

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