> ## Documentation Index
> Fetch the complete documentation index at: https://docs.atopile.io/llms.txt
> Use this file to discover all available pages before exploring further.

# BJT

## Parameters

<ParamField path="doping_type" type="dimensionless" />

<ParamField path="operation_region" type="dimensionless" />

## Interfaces

<ParamField path="base" type="Electrical" />

<ParamField path="collector" type="Electrical" />

<ParamField path="emitter" type="Electrical" />

## Global Attributes

These attributes are available to all modules and interfaces in a design.

<ParamField path="lcsc_id" type="str">
  Assign the LCSC ID of the module.

  If set, this will tell the picker to select that part from LCSC for this block.
</ParamField>

<ParamField path="manufacturer" type="str">
  This module's manufacturer name, as a string.

  Only exact matches on the manufacturer's name will be found by the picker.
  It's recommended to fill this information based on what `ato create component`
  provides.
</ParamField>

<ParamField path="mpn" type="str">
  This module's manufacturer part number, as a string.

  For the picker to select the correct part from the manufacturer,
  this must be set.
</ParamField>

<ParamField path="package" type="str">
  The package of the module.

  This drives which components can be selected, and what footprint is used.

  Must exactly match a known package name.
</ParamField>

<ParamField path="exclude_from_bom" type="bool" />

<ParamField path="override_net_name" type="str">
  When set on an interface, this will override the net name of the interface.

  This is useful for renaming nets which are automatically generated.
</ParamField>

<ParamField path="required" type="bool">
  Only for ModuleInterfaces.
  If set to `True`, require that interface is connected to something outside
  of the module it's defined in.
</ParamField>

<RequestExample>
  ```ato Basic Usage theme={null}
  import BJT, Resistor, ElectricPower

  bjt = new BJT
  bjt.doping_type ="NPN"
  bjt.mpn = "C373737

  # Use as amplifier with bias resistors
  base_resistor = new Resistor
  collector_resistor = new Resistor
  power_supply = new ElectricPower

  # Basic amplifier configuration
  power_supply.hv ~> collector_resistor ~> bjt.collector
  bjt.emitter ~ power_supply.lv
  input_signal ~> base_resistor ~> bjt.base
  output_signal ~ bjt.collector
  ```
</RequestExample>