1 to 60 MHz, ±10 ppb Endura Ruggedized Precision Super-TCXO


The Endura™ ruggedized SiT5541 is a precision Super-TCXO® with ±10 ppb stability over temperature, from -40°C to 105°C. Engineered for exceptional dynamic performance, this device provides ultra-stable timing in the presence of environmental stressors such as airflow, temperature perturbation, vibration, shock, and EMI. It delivers ±0.3 ppb/°C typical frequency slope (dF/dT) and 1.5e-11 ADEV at 10 second averaging time, and is resistant to shock and vibration with 0.01 ppb/g acceleration sensitivity.

The MEMS-based SiT5541 is ideal for replacing larger and less-robust power-hungry quartz OCXOs in PNT, aerospace-defense networking and communication systems. It is 40% smaller, 100x more resilient, and up to 2x lower power than comparable OCXOs.

The SiT5541 is 100% screened through the SiTime Endura process flow to provide high reliability. It can be factory-programmed to any combination of frequency, voltage, and pull range, enabling designers to optimize the clock configuration while eliminating the long lead time and customization costs associated with quartz products where each frequency is custom-built.

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10 pin package Elite X
"Specs" "Value"
Frequency 1 to 60 MHz
Frequency Stability (ppm) ±0.01 (±10 ppb), ±0.02 (±20 ppb)
Operating Temperature Range (°C) -40 to 85, -40 to 105
Package Type (mm²) 7.0 x 5.0
Oscillator Type TCXO-SE
Pull Range (ppm) ±6.25, ±10, ±12.5, ±25, ±50, ±80, ±100, ±125, ±150 , ±200, ±400, ±600, ±800, ±1200, ±1600, ±3200
Pin1 Feature Output Enable, No Connect, software OE control
Voltage Supply (V) 2.5 ±10%, 2.8 ±10%, 3.0 ±10%, 3.3 ±10%
Features 0.01 ppb/g acceleration sensitivity, ±0.5 ppb/°C frequency slope, ±150 ppb 20-year aging, 1.5e-11 ADEV at 10 second averaging time, 110 mW typ. power consumption
Availability Production

Exceptional dynamic stability under airflow, fast temp. ramp

  • ±10 ppb over-temp. stability from -40°C to 105°C 
  • ±0.5 ppb/°C frequency slope (dF/dT), 10°C/min ramp, ensures performance under fast temp. transients
  • ±150 ppb 20-year aging, 16x better than quartz, eliminates in-factory calibration required with less stable devices
  • 1.5e-11 ADEV at 10 second averaging time

2x smaller and up to 10x lower power than comparable OCXOs

  • 110 mW typical power consumption (2.5V)
  • Robust 7.0 mm x 5.0 mm ceramic package, insensitive to board bending stress, reducing PCB layout constraints
  • Ideal for replacing larger power-hungry quartz OCXOs 

Better acceleration sensitivity and 20x better phase noise under vibration

  • 0.01 ppb/g g-sensitivity, per IAW MIL-PRF-55310 section
  • Minimizes packet loss in high-vibration environments

No activity dips or microjumps

  • Eliminates any need for costly screening or burn-in tests

0.2 ps/mV power supply noise rejection (PSNR)

  • Reduces BOM by eliminating a dedicated LDO for TCXO

LVCMOS or clipped sinewave output

  • Optimize for best balance between EMI and jitter

Programmable features

  • Any frequency between 1 to 60 MHz
  • 2.25 to 3.63 V
  • Wide pull range

Digital frequency tuning through I2C

  • Digital control eliminates frequency shift caused by board noise
  • No frequency-pull non-linearity, improves dynamic performance in closed-loop applications
  • 5 ppt resolution minimizes time error in synch applications
  • ±6.25 to ±3200 ppm range provides designers flexibility and optimal system performance

Superior reliability

  • 2 billion hours MTBF
  • 20x higher shock survivability
  • Lifetime warranty
  • Reduces field failures due to clock components and associated trouble shooting and repair costs
  • Ruggedized Applications
  • Defense & Aerospace
  • Networking & Communication Systems
  • Long-range Communications
  • LEO SatCom
  • Airborne Communications
  • Field Communications
  • Manpack Radios
  • GPS / GNSS Modules
  • Vehicle Communications

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

Time Error Simulation Software – Simulate and analyze the impact of the local oscillator

TimeMaster Configuration Software – Configure and evaluate oscillators via I2C/SP

Reliability Calculator – Get FIT/MTBF data for various operating conditions

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