VBIC is a bipolar junction transistor (BJT) model that was developed as a public domain replacement for the SPICE Gummel-Poon (SGP) model. VBIC is designed to be as similar as possible to the SGP model, yet overcomes its major deficiencies. VBIC improvements on SGP:

• Improved Early effect modeling
• Quasi-saturation modeling
• Parasitic substrate transistor modeling
• Parasitic fixed (oxide) capacitance modeling
• Includes an avalanche multiplication model
• Improved temperature modeling
• Base current is decoupled from collector current
• Electrothermal modeling
• Smooth, continuous model