Germanium

Germanium packages

Temporarily unavailable — please consider Cernox® as an alternative.

Germanium Features

  • Recognized as a “Secondary Standard Thermometer”
  • High sensitivity provides submillikelvin control at 4.2 K and below
  • Excellent reproducibility better than ±0.5 mK at 4.2 K
  • Various models for use from 0.05 K to 100 K
  • Excellent resistance to ionizing radiation

Lake Shore germanium resistance temperature sensors are recognized as “Secondary Standard Thermometers” and have been employed in the measurement of temperature from 0.05 K to 30 K for nearly 40 years.

Germanium sensors have a useful temperature range of about two orders of magnitude. The exact range depends upon the doping of the germanium element. Cryogenic temperature sensors with ranges from below 0.05 K to 100 K are available. Between 100 K and 300 K, dR/dT changes sign and dR/dT above 100 K is very small for all models. Sensor resistance varies from several ohms at its upper useful temperature to several tens of kilohms at its lower temperature.

Because device sensitivity increases rapidly with decreasing temperature, a high degree of resolution is achieved at lower temperatures, making these resistors very useful for submillikelvin control at 4.2 K and below.

The sensors offer excellent stability, and ±0.5 mK reproducibility at 4.2 K. The germanium resistor is usually the best choice for high-accuracy work below 30 K. Use in a magnetic field is not recommended.

packaging optionsAA, CD
 

Lead extensions

 
Old part number
New part number
GR-200A-30
GR-50-AA
GR-200A-100
GR-300-AA
GR-200A-250
GR-200A-500
GR-1400-AA
GR-200A-1000
GR-200A-1500
GR-200A-2500

Typical germanium resistance

Typical germanium resistance

Typical germanium sensitivity

Typical germanium sensitivity

Typical germanium dimensionless sensitivity

Typical germanium dimensionless sensitivity