Ultra-low Jitter Differential XO for Standard Networking Frequencies

The SiT9501 is optimized for communications applications requiring ultra-low jitter and low power, and is available in the industry’s smallest differential package.

This differential oscillator supports 14 commonly used networking frequencies from 25 MHz to 644.53125 MHz. It features 70 fs RMS jitter (typ.), excellent immunity to power supply noise and environmental hazards, industry-standard package sizes down to 2.0 x 1.6 mm, low-power options, and wide temperature support up to 105°C.

The SiT9501 offers popular output drivers for LVPECL, LVDS, HCSL and low-power HCSL with integrated termination resistors. It also features a unique FlexSwing™ driver that performs like LVPECL but with independent control of VOH and VOL levels to simplify interfacing with chipsets having non-standard input-voltage requirements. The SiT9501 accepts power-supply voltages down to 1.8V for additional power savings.

View related products: 200 fs jitter | 600 fs jitter | XO lineup

6-pin Atna
Oscillator Type XO-DE
Frequency 14 standard frequencies
Frequency Stability (ppm) ±20, ±25, ±30, ±50
Phase Jitter (rms) 70 fs
Output Type LVPECL, LVDS, HCSL, Low-power HCSL, FlexSwing
Operating Temperature Range (°C) -20 to +70, -40 to +85, -40 to +95, -40 to +105
Voltage Supply (V) 1.8, 2.5, 2.8, 3.3, 1.71 to 3.63, 2.25 to 3.63
Package Type (mm²) 2.0x1.6, 2.5x2.0, 3.2x2.5
Features Ultra-low jitter, small size
Availability Sampling

Exceptional dynamic performance in real-life operating conditions

  • 70 fs RMS phase jitter (typ.)
  • ±20 ppm stability
  • Excellent system performance under environmental stress

20x better vibration sensitivity

  • Minimizes packet loss in high-vibration environments

0.01 ps/mV power supply induced jitter sensitivity

  • Simplify power supply design

2.0 x 1.6 mm package

  • Enables small form-factor system with stringent jitter requirement

Flexible programmable features

  • 14 common frequencies
  • 1.8 to 3.63 V
  • LVPECL, LVDS, HCSL, Low-power HCSL, FlexSwing: Flexible and low power, output drivers and terminations

Superior reliability

  • 1 billion hours MTBF
  • Lifetime warranty
  • Reduces field failures due to clock components and associated repair costs
  • Optical modules
  • 100G/200G/400G/800G Ethernet
  • Data centers
  • Coherent optics
  • Networking switches and gateways
  • AI/graphics cards
  • System clocking
  • Industrial applications
  • Ethernet switches and routers
  • FPGA

Narrow By:

Document Name Type
Manufacturing Notes for SiTime Products Other Quality Documents
TSMC Wafer SGS Report RoHS/Reach/Green Certificates
SiTime Environmental Compliance Declaration RoHS/Reach/Green Certificates
Certificate of Compliance-EU RoHS Declaration RoHS/Reach/Green Certificates

Frequency Slope (dF/dT) Calculator – Calculate frequency slope over temperature

3225 6-Pins | 5032 6-Pins with CP | 7050 6-Pins with CP – Preview packages with QFN 3D step models

Narrow By:

Resource Name Type
Silicon MEMS Reliability and Resilience Presentations
Performance Comparison: Silicon MEMS Verses Quartz Oscillators Presentations
How to Measure Clock Jitter in Precision Timing Applications Presentations
How to Measure Phase Jitter and Phase Noise in Precision Timing Applications Presentations
Silicon MEMS vs Quartz Supply Chain Presentations
Elite Platform - Transforming the Telecom and Networking Timing Market (Korean) Presentations
Elite Platform - Transforming the Telecom and Networking Timing Market (S. Chinese) Presentations
Elite Platform - Transforming the Telecom and Networking Timing Market (T. Chinese) Presentations
Elite Platform - Transforming the Telecom and Networking Timing Market Presentations
MEMS oscillators improve reliability and system performance in motor control applications White Papers
MEMS-Based Resonators and Oscillators are Now Replacing Quartz Presentations
Getting In Touch with MEMS: The Electromechanical Interface Presentations
J-AN10006 発振器のPCBデザインのガイドライン Application Notes
J-AN10007 クロックジッタの定義と測定方法 Application Notes
SiTime発振器の信頼性計算方法 Technology Papers
J-AN10028 プローブを使用した発振器の出力波形計測方法 Application Notes
MEMSおよび水晶ベース発振器の電磁場感受率の比較 Technology Papers
Electromagnetic Susceptibility Comparison of MEMS and Quartz-based Oscillators Technology Papers
MEMS発振器と水晶発振器の性能比較(耐衝撃と耐振動) Technology Papers
Shock and Vibration Comparison of MEMS and Quartz-based Oscillators Technology Papers
J-AN10033 発振器の周波数測定ガイドライン Application Notes
シリコンMEMS発振器の耐性および信頼性 Technology Papers
Resilience and Reliability of Silicon MEMS Oscillators Technology Papers
SiTimeの MEMS First™ プロセス技術 Technology Papers
MEMS Resonator Advantages - How MEMS Resonators Work Part 2 Presentations
How to Measure Long-term Jitter and Cycle-to-cycle Jitter in Precision Timing Applications Presentations
Silicon MEMS Oscillator Frequency Characteristics and Measurement Techniques Presentations
AN10029 Output Terminations for Differential Oscillators Application Notes
Timing Solutions for Communications & Enterprise Brochures/Fliers
Advantages of MEMS Timing - Parameters Videos
SiTime MEMS Oscillators - Revolutionizing the Timing Market Videos
Jitter Part 1: Principles and Practice with an Overview of Period Jitter Videos
Jitter Part 2: Phase Noise and Phase Jitter Videos
Jitter Part 3: C2C Jitter and Long Term Jitter Videos
QFN 3225 6-Pins 3D Step Models
QFN 5032 6-Pins with CP 3D Step Models
QFN 7050 6-Pins with CP 3D Step Models
Timing Solutions for Industrial Brochures/Fliers
SiT9501 Datasheet Datasheets
100G/200G/400G/800G Optical Modules Application Briefs
SiTime MEMS Timing Solutions for Optical Module Videos
Fronthaul and IP RAN Switches Application Briefs
SiT9501 Differential Oscillator - Enabling the Future of Optical Modules, Datacom Presentations
AN10067 Considerations for Measuring Phase Noise in Differential Oscillators Application Notes
SiT6760EB Evaluation Board User Manual User Manuals
SiTime MEMS First 工艺 Technology Papers
AN10073 How to Setup a Real-time Oscilloscope to Measure Jitter Application Notes
AN10071 Computing TIE Crest Factors for Telecom Applications Application Notes
AN10070 Computing TIE Crest Factors for Non-telecom Applications Application Notes
AN10072 Determine the Dominant Source of Phase Noise, by Inspection Application Notes
AN10074 Removing Oscilloscope Noise from RMS Jitter Measurements Application Notes