BZD27C33PHRFG

Diodes - Zener - Single

The BZD27C33PHRFG is a single Zener diode that provides a stable voltage reference under highly precise temperature and current conditions. It is typically used in a variety of electronic circuits and systems as a protective or clamping device or in a voltage/current limiting configuration. It is available in either a through-hole or surface mount package.

Application Field

The BZD27C33PHRFG is an ideal Zener diode for applications that require a precise voltage and current source such as audio filtering, DC/DC Converters and Linear regulators. It can be used to protect circuits from excessive voltages, to reduce the effects of circuit noise, and to provide voltage stabilization, voltage regulation, and voltage sensing. It is also suitable for RF signal detection and conditioning applications as well as low frequency audio filtering operations.

Working Principle

The BZD27C33PHRFG is a single Zener diode that utilizes the principle of a reverse-biased PN junction to references a precise voltage. When the diode is forward biased, the current flowing through the junction is limited due to the diode’s relatively low forward resistance. Once the forward voltage reaches a certain level, it reaches the Zener voltage or breakdown point, causing the current to dramatically increase as the voltage remains at a constant level.

The difference in current flow between the Zener diode’s forward and reverse bias results in its voltage regulation ability. In the forward bias condition, the diode will approximately track the source voltage until it reaches the Zener voltage and in the reverse bias condition it will hold the voltage level just below the breakdown level. This is because the voltage across the diode is mainly determined by the power supply and the current in the bias condition is not substantially affected by the change in voltage.

The BZD27C33PHRFG offers a wide temperature range with a highly precise repeatability of less than 1% over temperature, as well as excellent current limiting capabilities in both conditions. This gives the diode the ability to accurately regulate a voltage over a wide range of temperatures, and to protect a circuit from high voltage peaks and damaging current.