Semicon Associates has been supplying dispenser cathodes for cathode ray tubes and cathode ray tube applications for over 20 years. The typical dispenser for cathode ray tubes is constructed from a porous tungsten pellet impregnated with a barium emission enhancing compound. The tungsten pellet may be machined from a billet or pressed and sintered to final dimensional requirements. A support structure and heater may also be included. (See Value Added Assemblies.)

Dispenser cathodes are used in cathode ray tubes requiring high brightness, high resolution electron beams. Applications include medical monitors, avionics displays, projection tubes, and photo lithography tubes.

Beyond technical expertise, we offer a market and team driven approach. Semicon Associates will partner with you to develop customized solutions tailored to your needs. Our partnership continues after the sale is completed to ensure you get maximum benefit from your purchase.





Typical Specifications

Size - Emitting Surface	.041" (1.04mm)
Tungsten Density Range	80 +/- 1.5%
Impregnated Types	4:1:1 (S), 5:3:2 (B),6:1:2, others
Sputter Coating	Osmium Ruthenium (M), Iridium, other coatings
Tolerances	To +/- .0005" (+/-0.013 mm)
Operating Temperature	From 900°CB to 1050°CB
Emission Density	As high as 15 A/cm2, typically 5-8 A/cm2
Life Expectancy	From 3,000 hours to 20,000 hours