NPN Device Recommendation?

Lotta base current. Why not use a mosfet?

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

Thinking outside the box... producing elegant solutions.

Am 11.02.2017 um 21:44 schrieb Jim Thompson:

FZT859TA & friends by Zetex, now Diodes,Inc.

I currently use them as a cascode behind an array of IF3601/2. Like.

regards, Gerhard

Thanks, Gerhard! ...Jim Thompson

EVERYBODY loves the 2N2222 foe everything, so...find a SMT version.

Was that FZT869 ? I'm a big fan of the Zetex low R_CE(sat) transistors. I also like the SOT-223 package, although I'm disappointed in their commonly-poor thermal resistance specs.

The FZT851 is a good pulsing NPN, rated at 20A.

Nahh.

Naaah! Dumping a small capacitor, starting from 4.2V ...Jim Thompson

A little bitty 3-cent mosfet would discharge that cap just fine. If recharge linearity matters, a phemt would have much lower drain capacitance change vs voltage.

There are tricks for making and resetting fast linear ramps, but helping Jim doesn't seem to be a sensible activity.

Oh, yes! And I even opened the Altium Designer in a Windows virtual machine to be sure... Probably serious depletion of coffee.

I prefer SOT-89, for size, power and RF reasons.

The lead frame of the sot-223 is really thin because they have to bend it 4 times and the contact area to the board is not under the chip, but as far outside as possible.

Not unlikely. Can't say much. Customer. ...Jim Thompson

Not to mention the < 0.42 ohm impedance, demanding a loop inductance under

This isn't monolithic, Jim ;-)

Tim

Isn't the whole world monolithic ?>:-} ...Jim Thompson

Yes, right, much better. But not many dies one wants to use come in that package.

And encrypted.

It looks like Infineon are phasing out Sot-223. My BFG196 transistors are gone.

But there are some new ones in sot-89 for GHz medium power, including at least one that has the emitter on the middle tab, not the collector. Ideal for CE RF stages, no parasitics from cooling.

Just a moment,

Cheers, Gerhard

MMBT2222?

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

If it were, geologists would sure have a lot less to study!

Tim