Field Programmable | Learn More

The SiT8921B is the most robust and reliable high-frequency oscillator on the market with 0.1 ppb/g vibration sensitivity (g-sensitivity), 50,000 g shock and 70 g vibration resistance and 500 million hour MTBF. This device delivers a perfect combination of high frequency (up to 137 MHz), best stability (±20 ppm), military temperature (-55 °C to 125 °C) and smallest package (2.0 x 1.6 mm) that are not available from quartz.

For the same device in a SOT23-5 package, refer to the SiT2021B.

FlexEdgeTM Rise/Fall Time
119 to 137 MHz
Frequency Stability (ppm)
±20, ±25, ±50
Operating Temperature Range (°C)
-55 to +125
Oscillator Type
Output type
Package Type (mm²)
2.0x1.6, 2.5x2.0, 3.2x2.5, 5.0x3.2, 7.0x5.0
Phase Jitter (RMS)
1.3 ps
Field programmable, Military temperature -55 to 125°C
Voltage Supply (V)
1.8, 2.5 to 3.3
  • Oil exploration drilling
  • Power amplifiers
  • Industrial motors
  • Pressure meters
  • Aerospace equipment
  • Geothermal energy equipment


Features & Benefits

Unique combination of

  • high frequency (119 to 137 MHz)
  • ±20 ppm
  • military temperature range (-55 to 125 °C)
  • smallest package (2.0 x 1.6 mm x mm)
    • Best-in-class stability and temp. range for space-constrained environments

0.1 ppb/g low g-sensitivity

  • No performance degradation in harsh environments

50,000 g shock and 70 g vibration

  • Indestructible

FlexEdge™ rise/fall time

  • Optimize EMI to reduce interference to other systems

Ultra-fast lead time (4 to 6 weeks)

  • Reduce inventory overhead
  • Mitigate shortage risks


Performance Reports

The following PDF reports contain details of actual measurements on SiTime devices at the frequencies mentioned below and are intended to supplement the datasheet. Measurement conditions and equipment are specified in the individual files. If you desire a more detailed report than the ones provided below, please contact your local SiTime sales representative or email

IBIS Models

LVCMOS IBIS 1.8V SiT8921 (LVCMOS, 1.8 V)
LVCMOS IBIS SiT8921 (LVCMOS, 2.25 to 3.63 V)
LVCMOS IBIS 2.5V SiT8921 (LVCMOS, 2.5 V)
LVCMOS IBIS 2.8V SiT8921 (LVCMOS, 2.8 V)
LVCMOS IBIS 3.0V SiT8921 (LVCMOS, 3.0 V)
LVCMOS IBIS 3.3V SiT8921 (LVCMOS, 3.3 V)

Quality Documents

Additional Resources