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1N3129 on quarter dollar

The 1N3129 is a 20 mA Germanium tunnel diode. 1N3129 Specifications (from http://www.americanmicrosemi.com/catalog/1N3129.html):

  • Tektronix part number: 154-0043-00 (152-043)
  • Peak current: 20 ± 1 mA
  • Total capacitance: 20 pF
  • Peak to valley current ratio: min. 8.0
  • Peak voltage: 100 mV
  • Valley voltage: 300 mV
  • Forward voltage at peak current: 575 mV
  • Series inductance: 0.6 nH
  • Series resistance: 2.5 Ω
  • Semiconductor material: Germanium
  • Maximum operating temperature: 100 °C
  • Package style: DO-25var
  • Mounting style: T

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