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.

Want other options? 200 fs jitter | 600 fs jitter 

6-pin Atna
"Specs" "Value"
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 Production

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
  • 服务器与存储
  • 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
SiTime Conflict Minerals Policy Other Quality Documents
SiT937x, SiT9501 Product Qualification Report Reliability Reports
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