0.1 ppm, µPower, Low-Jitter, Ruggedized 32.768 kHz Super-TCXO


The Endura™ SiT7910 ruggedized 32.768 kHz Super-TCXO is designed for pulse-per-second (pps) timekeeping in aerospace, defense and other applications that operate in harsh environments.

With best-in-class ±0.1 to 0.4 ppm frequency stability, this 32.768 kHz reference clock is ideal for GNSS receivers. It has 25x better stability which enables GNSS signal lock within seconds (compared to 30+ sec with legacy quartz clocks) to provide accurate timing and location data much faster. Performance is further enhanced with low 2-ns RMS phase jitter and 20-year aging of only ±2.5 ppm.

The SiT7910 Super-TCXO is built for ruggedized hand radios, portable equipment, ground vehicles and airborne environments. It has an operating temperature range from -55°C to 105°C, has best-in-class 20 ppb/g g-sensitivity for resilience in high vibration environments, and consumes only 6.0 µA to extend battery life. It is 100% screened through the SiTime Endura process flow to provide high reliability.

"Specs" "Value"
Frequency 32.768 kHz
Frequency Stability (ppm) ±0.1, ±0.2, ±0.4
Output Type LVCMOS
Operating Temperature Range (°C) -40 to 85, -40 to 105, -55 to 105
Voltage Supply (V) 1.8, 1.62 to 3.63
Package Type (mm²) 2.5x2.0 ceramic
Features Low g-sensitivity (20 ppb/g), low phase jitter (2 ns RMS), low 20-year aging (±5 ppm)
Availability Pre-production Sampling

Most accurate 32.768 kHz TCXO on the market for the fastest GNSS signal lock, most accurate time synchronization, and fastest position acquisition

  • ±0.1 ppm over -40°C to +85°C for 1.8V
  • ±0.2 ppm over -55°C to +105°C for 1.8V
  • ±0.4 ppm over -55°C to +105°C for 1.62 to 3.63V
  • ±2.5 ppm 20-year aging

Robust against shock, vibration, and temperature

  • Low g-sensitivity: 20 ppb/g

Ultra-low power: 6 µA (typ)

  • Maximizes battery life

Low jitter 2 ns RMS (typ) Integrated Phase Jitter

  • Ideal for communications and radio applications

Small footprint 

  • 2.5 x 2.0 mm ceramic package saves board space
  • Pulse-per-second (PPS) timekeeping
  • RTC reference clock
  • GPS/GNSS modules
  • Defense & aerospace
  • Land mobile radio
  • Audio and processor clocking in portable navigation devices (PND)
  • Vehicle comms/telemetry
  • Airborne communications