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# matching simulation with bias conditions

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#### yefj

Hello,for Bjt to be in working state. we need to V_B>V_E and V_C>V_B
How do i know the saturation current of 1.3A from mathematical point of view using the data sheet.
I know that the formula is as shown bellow.
the datasheet is as shown bellow:
the spice model is as shown bellow,Where can i see the formula parameters at the spice model description?
Thanks.

#### BigBoss

$\frac{A_{E}qD_{n}n_{i}^2}{N_{B}W_{B}}$ is called as $I_{s}$ (Saturation Current and you will never know this Manufacturer Parameters.That's why you should use given upper level circuit parameters

#### FvM

##### Super Moderator
Staff member
SPICE uses Gummel-Poon model. Refer to LTspice help for bipolar transistor model and literature, e.g. https://en.wikipedia.org/wiki/Gummel–Poon_model

You are operating the small signal transistor far beyond it's maximum ratings, unlikely that the simulation result matches real component behavior.

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