Any thoughts on glass bead rectifiers vs epoxy rectifiers for DC power supply?

[Hgspine]

Any thoughts on glass bead rectifiers vs epoxy rectifiers for DC power supply?

Thank you.

[Gyro]

I've always suspected that they must behigher quality, presumably they are hermetic and must be more expensive to package.

I have absolutely no evidence that they are any more reliable than the epoxy packaged equivalents in practice though.

[T3sl4co1l]

Well, they meet the specs in the datasheet.  Is that what your application needs?

Both are typically "glass passivated", which means the die itself has some kind of glass coating (probably SiO2).  Obviously, the sinterglass type goes on to have a full glass body, of whatever type of glass has a fairly low melting point (probably not a silica-based glass, because the alkali content would contaminate the die; may be phosphate based or something like that).

Don't think I ever looked up the cost difference.  Sinterglass types seem to be more of an anachronism, I see them so rarely (if ever).

Tim

[amyk]

I believe the ceramic package has slightly higher power dissipation capability and temperature range.