10 to 60 MHz, ±1 ppb Ruggedized OCXO


The ruggedized Endura Epoch SiT7111 OCXO is a MEMS-based device, designed to the solve long-standing problems of quartz OCXOs. Leveraging SiTime’s unique temperature sensing technology and advanced CMOS design, it delivers excellent stability in the presence of environmental stressors such as airflow, temperature perturbation, vibration, shock, and EMI.

This OCXO delivers significant improvements in size, weight, and power (SWaP) with up to 20X smaller size, up to 300X less weight, and up to 2X lower power. SiTime’s silicon manufacturing process ensures the highest quality with shorter lead times for a robust supply chain.

The SiT7111 OCXO comes in a small surface mount package (9.0 mm x 7.0 mm x 3.6 mm) and offers ±3 ppb over-temp stability over -40°C to 95°C, ±0.02 ppb/°C typical frequency slope (ΔF/ΔT), and 5E-12 Allen deviation. The SiT7111 has a frequency pull range of ±400 ppm with fine resolution as low as 0.05 ppt (5E-14).

Epoch OCXO package 9.0x7.0
"Specs" "Value"
Frequency 10 to 60 MHz
Frequency Stability (ppm) ±0.001 (±1 ppb)
Operating Temperature Range (°C) -20 to 70, -40 to 85, -40 to 95
Package Type (mm²) 9.0 x 7.0
Oscillator Type OCXO
Voltage Supply (V) 2.5, 2.8, 3.3
Features ±20 ppt/°C frequency slope, 5E-12 ADEV, 420 mW steady state power consumption
Availability Pre-Production Sampling

Benchmark holdover in real world conditions for Assured PNT systems

  • Less than 3.0 µs time error after 12 hrs without GPS synchronization
  • 5E-12 ADEV at 10 second averaging time, up to 4X better than vibration-rated quartz OCXOs
  • Up to 10X better aging with ±0.1 ppb/day aging

Ultra resilient operation in harsh environments

  • Up to 70X better g-sensitivity than vibration rated quartz OCXOs
  • ±1 ppb over-temp. stability from -40 to 95°C
  • ±0.01 ppb/°C frequency slope (ΔF/ΔT)
  • 20,000 g shock survivability

Lower size, weight, and power (SWaP)

  • Up to 3X lower power at 420 mW typical power consumption (3.3 V)
  • Up to 20X less volume in a robust 9.0 x 7.0 x 3.6 mm package
  • Up to 300X less weight at 0.35 g

Best phase noise under vibration

  • Minimizes link drops in high-vibration environments

No activity dips or microjumps

  • Reduces need for costly screening or burn-in tests

On-chip power-supply noise filtering for excellent PSNR

  • Reduces BOM by eliminating a dedicated LDO for OCXO

LVCMOS or clipped sinewave output

  • Optimizes for best balance between EMI and jitter

Rich programmable features

  • Any frequency between 10 to 60 MHz
  • 2.5, 2.8, and 3.3 V power supply options

Digital frequency tuning through I2C and SPI

  • Large pull range from ±3.125 to ±400 ppm
  • 5E-14 frequency pull resolution
  • Assured Positioning Navigation Timing (PNT)
  • GNSS Receivers
  • Guidance Systems
  • Data Communication Systems
  • SatCom Terminal
  • Radar
  • Manpack and Airborne Radios
  • Vehicle Communication Holdover and IEEE 1588 Synchronization

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

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