voltlevel

Voltlevel is a term used in electronics and electrical engineering to denote the voltage level of a signal or power supply within a circuit. It is not a single standard, but a descriptive concept that depends on context and the applicable technology. In digital electronics, voltlevel defines the boundary between logic low and logic high. Various logic families specify different voltage ranges for what constitutes a “0” or a “1.” For example, TTL logic operating from a nominal 5-volt supply typically recognizes a high at about 2.0 volts or higher and a low at about 0.8 volts or lower. CMOS devices powered by 3–5 V supplies generally use input thresholds around a fraction of the supply voltage, with high-level inputs typically above roughly 0.7 Vdd and low-level inputs below roughly 0.3 Vdd, though exact values vary by device and process.

In power distribution, voltlevel is used when describing nominal voltages on lines or equipment, such as low voltage (up to around 1 kV), medium voltage (roughly 1–35 kV), and high or extra-high voltage above that. The term is also used in measurement and testing to refer to the instantaneous or nominal amplitude of an electrical signal, including DC levels and AC peak or RMS values.

Setting appropriate voltlevels is essential for interoperability, safety, and performance; mismatches can cause logic errors, reduced noise margins, or equipment damage. See also: logic level, voltage standard, voltage regulator.