2N datasheet 2N component 2N integrated circuit 2N schematic 2N application note N 2N 2N34 2N3. 2N Description = Low Power Field Effect Transistor ;; Case Style = TO18 ;; Geometry = FN ;; Page Number = E28+E Page 1. This datasheet has been downloaded from at this page. Page 2.

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2N Datasheet(PDF) – New Jersey Semi-Conductor Products, Inc.

I can sort of understand why TI wouldn’t bother updating an old app note, but I find it strange that LT wouldn’t update one of its “solutions” on its website. The important point here is that all the current goes thru R1. I understand that the 2N JFET is there to remove the beta error caused by connecting the BJT base directly to the op amp output datasjeet in this circuit. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Datzsheetand our Terms of Service.

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By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Sign up or log dqtasheet Sign up using Google. Home Questions Tags Users Unanswered. That’s what makes it dahasheet “precision” current source.

The old solutions still work! However, you’d need to be careful about the gate capacitance causing stability problems. Both of the example circuits are old; the 2N transistor is a metal-case unit no longer easily available.

There is no error due to base current.

The point of the FET and NPN transistors is to provide current gain so that the output current can be a lot more than the opamp output can provide. In fact, in this case the opamp output current is ideally 0.

2N3456 – N-CHANNEL SILICON JUNCTION FIELD-EFFECT

Null 4, 10 22 Probably updating solutions is not a business priority. Olin Lathrop k 30 Sign up using Email and Password. Email Required, but never shown.

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Post as a guest Name. Note that the LM is very old. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. If the opamp is powered so that its output can swing to 12 V or so, then just a single modern MOSFET would suffice, even for very large currents. Why — was it an electrical limitation or cost or something else?

Whit3rd 4, 10 Sign up using Facebook. The size of the silicon slab used was very limited.