BJT DC bias and load line
Fixed, emitter-feedback, collector-feedback and divider bias with gain and temperature sweeps.
Development preview. Check the assumptions below before relying on a result. Calculations run in your browser.
How it calculates
Divider bias: IB = (VTH − VBE)/(RTH + (β+1)RE); VCE = VCC − IC RC − IE RE
Assumptions
- Forward-active constant-beta model with linear VBE temperature coefficient; saturated predictions are identified as invalid.
- Collector-feedback resistor current includes base current. Early effect and resistor temperature coefficients are omitted.
Worked example
These are the calculator's default inputs. Change any input above to recalculate.
Inputs
- Bias circuit
- divider
- Supply
- 12 V
- Collector resistor
- 2200 Ω
- Emitter resistor
- 1000 Ω
- Base / upper-divider resistor
- 47000 Ω
- Lower-divider resistor
- 10000 Ω
- Nominal beta
- 100
- Minimum beta
- 60
- Maximum beta
- 200
- VBE at 25 °C
- 0.7 V
- VBE temperature coefficient
- -0.002 V/K
- Device temperature
- 25 °C
Results
- Collector-emitter voltage
- 7.87087 V
- Collector current
- 0.00128633 A
- Base current
- 0.0000128633 A
- Emitter voltage
- 1.2992 V
- Collector voltage
- 9.17007 V
- Collector dissipation
- 0.0101246 W
- Operating region
- Forward active