UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Hot-carrier diodes. What became of them?

Al (astral highway) · 24th Nov 2022, 2:37 pm

Hi there,

Hasn't the name just been largely replaced over time by the descriptor Schottky diode/ Schottky barrier diode, very commonly in use?

Here's one current offering from On Semiconductor which uses dual terminology in its blurb. 100pS typ switching time.

https://pdf1.alldatasheet.com/datash...MBD301LT1.html

On the other hand I have a couple of the snazzy gold-plated types ex RADAR mixer cct, from the period you are describing, and I imagine expensive at the time, as you say.

I've also used the small-signal types that are available.

Interesting to read here;

Schottky metal–semiconductor junctions are featured in the successors to the 7400 TTL family of logic devices, the 74S, 74LS and 74ALS series, where they are employed as Baker clamps in parallel with the collector-base junctions of the bipolar transistors to prevent their saturation, thereby greatly reducing their turn-off delays.

24th Nov 2022, 2:37 pm	#2
Al (astral highway) Dekatron Join Date: Nov 2006 Location: London, UK. Posts: 3,496	Re: Hot-carrier diodes. What became of them? Hi there, Hasn't the name just been largely replaced over time by the descriptor Schottky diode/ Schottky barrier diode, very commonly in use? Here's one current offering from On Semiconductor which uses dual terminology in its blurb. 100pS typ switching time. https://pdf1.alldatasheet.com/datash...MBD301LT1.html On the other hand I have a couple of the snazzy gold-plated types ex RADAR mixer cct, from the period you are describing, and I imagine expensive at the time, as you say. I've also used the small-signal types that are available. Interesting to read here; Schottky metal–semiconductor junctions are featured in the successors to the 7400 TTL family of logic devices, the 74S, 74LS and 74ALS series, where they are employed as Baker clamps in parallel with the collector-base junctions of the bipolar transistors to prevent their saturation, thereby greatly reducing their turn-off delays. __________________ Al Last edited by Al (astral highway); 24th Nov 2022 at 2:54 pm.