1 to 150 MHz, Spread-spectrum, Extended Temperature (-55°C to 125 °C)


The Endura™ SiT9045 spread spectrum oscillator is engineered for harsh environments and is ideal for high-reliability aerospace and defense applications. This MEMS-based SSXO has ultra-low acceleration sensitivity at 0.1 ppb/g and high temp operation up to 125°C.

This device reduces EMI (up to 30 dB) by offering two techniques: spread spectrum clocking and rise/fall time adjustment of the clock signal, ensuring emissions compliance with maximum flexibility and minimum engineering effort. The SiT9045 is available in three industry-standard packages to replace quartz products without any board design changes. 

The SiT9045 is 100% screened through the SiTime Endura process flow to provide high reliability.

Industry standard packages for EMI reduction and drop-in replacement of quartz oscillators without any board changes
"Specs" "Value"
Frequency 1 to 150 MHz
Frequency Stability (ppm) ±20, ±25, ±50
Operating Temperature Range (°C) -55 to +125
Package Type (mm²) 2.0x1.6, 2.5x2.0, 3.2x2.5
Oscillator Type SSXO-SE
Spread Percentage (%) Center: ±0.125 to ±2.000, Down: -0.25 to -4.00
FlexEdgeTM Rise/Fall Time Yes
Voltage Supply (V) 1.8, 2.25 to 3.3
Features Ultra-low acceleration sensitivity, MIL-STD-55310, MIL-PRF-883, AEC-Q100
Availability Production

Low acceleration sensitivity

  • As low as 0.1 ppb/g

Spread spectrum clocking

  • Up to 30 dB electromagnetic interference (EMI) reduction
  • Up to 134 times better electromagnetic susceptibility (EMS) than an external resonator plus an SSIC solution
  • Solves EMI problem and improves reliability in noisy environments

Flexible EMI reduction options

  • Wide spread range: center spread up to ±2.0%, down spread down to -4.0%
  • Configurable rise/fall time: 8 options
  • Configurable spread profile: triangular, Hershey kiss, or random

Three industry-standard packages

  • 100% drop-in replacement of quartz XO
  • Enables EMI reduction without board redesign, metal housing, or other expensive EMI reduction method

Low cycle-to-cycle jitter: 8.5 ps

  • Minimize impact to system timing budget

Extensive programmability

  • Any frequency from 1 to 150 MHz with 6 decimal-place accuracy
  • Supply voltage of 1.8 V; 2.5 to 3.3 V
  • Frequency stability from ±20 ppm to ±50 ppm
  • Airborne Communications
  • Field Communications
  • Vehicle Communications
  • Avionics
  • Ruggedized Applications

Reliability Calculator Get FIT/MTBF data for various operating conditions

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

2016 4-Pins | 2520 4-Pins | 3225 4-Pins – Preview packages with QFN 3D step models

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