3N187, where to find this type of MOSFET in LTSpice

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Discussion Overview

The discussion revolves around finding the 3N187 MOSFET model in LTSpice, with participants seeking guidance on locating this specific component and understanding how to implement it in simulations. The conversation includes inquiries about equivalent components, DIY alternatives, and modeling techniques for dual gate MOSFETs.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant asks where to find the 3N187 MOSFET in LTSpice, indicating they are referencing a book.
  • Another participant provides links to a website and a PDF for equivalent components, suggesting a Google search for alternatives.
  • A participant expresses uncertainty about the cost and feasibility of creating a similar component themselves.
  • Some participants assert that transistor components must be purchased, as manufacturing them to specification is impractical for hobbyists.
  • There is a discussion about modeling a dual gate MOSFET as two stacked single gate FETs, with specific instructions on setting threshold voltages.
  • A participant mentions fixing an issue related to the dual gate model, but does not clarify the nature of the fix.
  • Several participants express gratitude for the assistance and share additional resources, including a text library file for dual gate FET LTSpice models.

Areas of Agreement / Disagreement

Participants generally agree that the 3N187 MOSFET is not readily available for DIY manufacturing and that purchasing components is necessary. However, there is no consensus on the best method to model the dual gate MOSFET in LTSpice, as different approaches are discussed without resolution.

Contextual Notes

Some participants reference external resources and communities, such as the LTSpice Yahoo group, for further assistance, indicating a reliance on collaborative knowledge sharing. There are also mentions of specific modeling techniques that may depend on individual understanding of LTSpice functionalities.

michael1978
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hello 3N187, where to find this type of mosfet in ltspice, , because i am reading one good book and i need this 3N187, any help is welcome
 
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is that with money?

is possible something similar to make self, me i don't know, only if somebody help me
 
You must buy transistor components. They would be impossible for a hobbyist to manufacture to spec.
 
jedishrfu said:
You must buy transistor components. They would be impossible for a hobbyist to manufacture to spec.
i just need one dual gate, gratis, i find one, but i don't know how to install in ltspcie
https://forum.allaboutcircuits.com/threads/dual-gate-mosfet-model-for-ltspice.131162/
 
michael1978 said:
than you, i will try to make
no i don't know is dual gate model
 
michael1978 said:
no i don't know is dual gate model

that doesn't make sense
 
  • #10
You should be able to model it as two stacked single gate fets. That's really all it is inside, sharing one channel so the drain of the lower one is also the source of the upper one. Set Vthresh for the upper one equal to the difference between the external lower and upper gate thresholds.
 
  • #11
olaney said:
You should be able to model it as two stacked single gate fets. That's really all it is inside, sharing one channel so the drain of the lower one is also the source of the upper one. Set Vthresh for the upper one equal to the difference between the external lower and upper gate thresholds.
thank you but i fix it
 
  • #12
thnx to everybody
 
  • #13
michael1978 said:
3N187, where to find this type of mosfet in ltspice, , because i am reading one good book and i need this 3N187,
What is that “one good book” ?

Michael1978 also posted on the "All About Circuits" website. A solution was provided by Bordodynov who is also a stalwart of the Ltspice yahoo group. It is well worth joining the yahoo group if you are using Ltspice.

A text library file is attached for those who are interested in dual gate FET Ltspice models.
 

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  • #14
Baluncore said:
What is that “one good book” ?

Michael1978 also posted on the "All About Circuits" website. A solution was provided by Bordodynov who is also a stalwart of the Ltspice yahoo group. It is well worth joining the yahoo group if you are using Ltspice.

A text library file is attached for those who are interested in dual gate FET Ltspice models.
thnx and happy new year
 

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