The YPS-174 is the most common standard Schottky field emitter module, equivalent in dimensions to both FEI (18210) – and Denka (174C).

The YPS-174 is compatible with thermal field emission sources used on systems including Amray, Hitachi, ISI/Topcon, JEOL, ZEISS/LEO (Gemini), FEI (pre-2002), Tescan.

Technical Specifications

  • Operating Temperature: 1800k 
  • Operating Pressure (recommended): < 5 × 10⁻⁹ mbar
  • Filament Current: 2.2 – 2.5 A
  • Suppressor protrusion: 250µm
  • Standard Emitter Radius: 0.4 – 0.6 µm*

    *We offer a variety of radii to accommodate different requirements. For customised emitter radius or instrument type needs, please contact us.

Key Features

  • YPS Schottky TFEs exhibit excellent stability over a wide range of acceleration voltages and long operating times.
  • These products are suitable for users proficient in replacing TFEs and familiar with changing, loading, and aligning them in a clean environment.
  • YPS TFEs have a long life, are competitively priced, and come with a 12-month warranty.
  • Each YPS TFE includes an extensive and unique datasheet detailing the supplied emitter characteristics: radii in µm, current vs voltage, and filament current vs emitter temperature graph.