1 to 60 MHz, ±5 ppb Endura Ruggedized Precision Super-TCXO


The Endura™ ruggedized SiT5543 Super-TCXO® provides ±5 ppb stability over temperature, from -40°C to 95°C, delivering OCXO-level frequency stability without the use of custom-made, low g-sensitivity quartz OCXOs. The MEMS-based SiT5543 is ideal for PNT, aerospace-defense networking and communication systems. In a small 5 x 7 mm footprint and 2 mm high ceramic package, the SiT5543 is ideal for replacing bulky, less-robust, and power-consuming quartz OCXOs. The SiT5543 is 40% smaller, 100x more resilient, and up to 2x lower power.

This Super-TCXO is engineered for exceptional dynamic performance—offering the most stable timing in the presence of environmental stressors such as airflow, temperature perturbation, vibration, shock, and EMI. It delivers ±0.3 ppb/°C typ. frequency slope (dF/dT), 1.5e-11 ADEV at 10 second averaging time and 0.01 ppb/g acceleration sensitivity.

The SiT5543 is 100% screened through the SiTime Endura process flow to provide high reliability. It can be factory-programmed to a variety of configurations, eliminating the long lead time and customization costs of quartz products.

10 pin package Elite X
"Specs" "Value"
Oscillator Type TCXO-SE
Frequency 1 to 60 MHz
Frequency Stability (ppm) ±0.005 (±5 ppb)
Output Type LVCMOS, Clipped Sinewave
Operating Temperature Range (°C) -40 to 85, -40 to 95
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%
Package Type (mm²) 7.0 x 5.0
Features 0.01 ppb/g acceleration sensitivity, ±0.3 ppb/°C frequency slope, ±150 ppb 20-year aging, 1.5e-11 ADEV at 10 second averaging time, I2C digital control
Availability Pre-production Sampling

Exceptional dynamic stability under airflow, fast temp. ramp

  • ±5 ppb over-temp. stability from -40°C to 95°C 
  • ±0.3 ppb/°C frequency slope (ΔF/ΔT), 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

40% smaller and 2x 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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