Hi OB_1,
See this offer and write him to ask validity:
**broken link removed**
IF you wish to use such diode at frequencies under say 100 MHz then I suggest using the so called Lambda diode because you can actually assemble a Lambda diode you yourself from two JFETs (from a P and an N channel type) or from an N channel JFET and a PNP transistor because a P channel JFET is becoming also obsolote...:shock: The difference between a Lambda and a real tunnel diode is in the forward bias voltage and current, apart from the operational frequency limit.
Just found this manufacturer for tunnel diodes:
http://www.aeroflex.com/ams/metelics/micro-metelics-prods-TD-MBD.cfm
Regading a model in Spice:
**broken link removed**
unkarc