Semiconductors Formulas
Semiconductor formulas describe the behaviour of diodes, transistors, and their biasing networks. These calculators help you set operating points and predict device currents and voltages. They underpin amplifier, switch, and logic-level interface design.
Semiconductors Formula Calculators
- MOSFET Conduction Loss P = I² × Rds(on)
- MOSFET Switching Loss P = ½ × V × I × (tr + tf) × f
- BJT Total Dissipation P = VCE × IC + VBE × IB
- Diode Power Loss P = Vf × If
- Zener Regulation Resistor R = (Vin − Vz) / (Iz + Iload)
- Transistor Current Gain (β) β = IC / IB
- MOSFET Gate Drive Power Pd = Qg × Vgs × f
- MOSFET Rds(on) vs Temperature RDS(T) = RDS_ref × (1 + tc × ΔT)
- Op-Amp Slew Rate Limit fmax = SR / (2π × Vpk)
- BJT Vbe vs Temperature Vbe(T) = Vbe_ref − 0.002 × ΔT
- Diode Vf vs Temperature Vf(T) = Vf_ref − 0.002 × ΔT
- Op-Amp Input Offset Error Vos_total = Vos + drift × ΔT
- MOSFET Gate Drive Headroom Vmargin = Vgs − Vth
- BJT Emitter Bias Current Ic ≈ (VB − 0.7) / RE
- Shockley Diode Equation I = Is × (e^(V/(n×Vt)) − 1)
- IGBT Total Loss P = Vce × Ic × D + Esw × f
- MOSFET Body Diode Loss P = Vf × If × (1 − D)
- MOSFET Avalanche Energy Eas = 0.5 × L × I² × Vbr/(Vbr − Vcc)
- Varactor Diode Capacitance C = Cj0 / (1 + V/Vbi)^m
- Gate-Driver Peak Current Ipk = Vdrive / (Rdrv + Rg)
- Bootstrap Capacitor Cboot = Qg / ΔV
- MOSFET Output Capacitance Loss P = ½ · Coss · Vds² · fsw
- Diode Reverse-Recovery Loss P = Qrr · Vin · fsw
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