Dave,

This is the reason why we have this painful tx calibration routine to level the output. The device variations are prettt wide.

On Fri, Jun 16, 2023, 8:26 AM stone_ridge_road <AB7Echo@...> wrote:

Yes, they do apply in analog use.? They aren't directly applicable, but they represent the ability of the device to change voltage level.? A slow switch is going to have a low Ft.? The IRF510 is literally twice as fast a switch as the IRZ24N ... at least at their recommended bias conditions.

I worked in the discrete semiconductor industry (engineer, then business manager) for over 30 years.? Saturation certainly affects the turn on delay (how hard are you driving it to put it into saturation) and turn off delay (how hard was it saturated), but it doesn't significantly affect the rise and fall times as the device traverses the linear region.

Besides, I was actually asking more about the effect of possible variations from batch to batch.? The listed specs only give typicals ... and trust me, as an ex-producer of semiconductors I know that variations can be significant.

Dave?? AB7E

On 6/15/2023 3:54 PM, ajparent1/kb1gmx wrote:

Dave,

Ton and Toff do not apply in analog use.? Those are saturated switch numbers.
Unlike bipolar MOSFETs do not exhibit FT (Frequency where gain goes to 1)..
They sorta do but the mechanism is different.

For example I've used IRF510s at 70mhz and they are real good at 50mhz.
I see no reason the IRFz24 would be different save for the input C is greater
so the matching is more critical as you go up in frequency.

--
Allison
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Please use the forum, offline and private will go to bit bucket.