A voltage clamp is an electronic device used to maintain a specific voltage level in a circuit, preventing it from exceeding a predetermined threshold. This is crucial in protecting sensitive components from damage due to voltage spikes or fluctuations. Voltage clamps are commonly used in various applications, including power supplies, telecommunications, and automotive electronics. These devices work by diverting excess voltage away from the protected circuit, effectively "clamping" the voltage to a safe level. They can be found in different forms, such as transient voltage suppressors and zener diodes, each designed for specific voltage ranges and applications.