BZG05C39-HM3-18

Series:	Automotive, AEC-Q101, BZG05C-M
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	39V
Tolerance:	±5.13%
Power - Max:	1.25W
Impedance (Max) (Zzt):	50 Ohms
Current - Reverse Leakage @ Vr:	500nA @ 30V
Voltage - Forward (Vf) (Max) @ If:	1.2V @ 200mA
Operating Temperature:	150°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	DO-214AC, SMA
Supplier Device Package:	DO-214AC (SMA)

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Diodes - Zener - SingleThe BZG05C39-HM3-18 is a single zener diode designed for use in low voltage circuit applications. It is a small surface mount diode with a maximum voltage rating of 18V, a power dissipation of 100mW and an operating temperature range of -40°C to +85°C. Zener diodes are used in low voltage circuits to regulate voltage and provide protection against over-voltage or voltage spikes. The BZG05C39-HM3-18 is ideal for use in power supplies, signal conditioning, audio and video equipment, automotive electronics, computers and telecommunications equipment.Zener diodes are a form of semiconductor device and are also referred to as a voltage regulator diode. As with all diodes they have an anode and a cathode connection with the anode being the positive lead and the cathode the negative lead. They are designed to only allow electrical current to flow in one direction, with the anode being the source and the cathode the destination. As with other diodes, any voltage potential between the anode and cathode will cause a small amount of current to flow through the device.The key difference between a normal diode and a zener is that the zener has a reverse breakdown region and allows current to flow from the cathode to the anode once the voltage applied to the device exceeds a certain voltage known as the zener voltage. This process of reverse breakdown is known as avalanche breakdown, and during this process the current is not in direct proportion to the applied voltage but is limited by the diode due to the Zener effect. This behaviour allows the diode to operate as a voltage regulator, and allows current to flow in one direction only.As the voltage across the diode is increased to its zener voltage, the current conducted is limited and the voltage remains relatively constant. The BZG05C39-HM3-18 has a zener voltage of 18V, and the voltage across the diode will remain at a constant level at or below this voltage. This is known as the zener effect, and is the main feature of zener diodes. It is important to note that zener diodes do not provide protection against over-current or excessive current flow.In operation the BZG05C39-HM3-18 will regulate the voltage in low voltage circuit applications by ensuring the voltage across the diode does not exceed a certain level. This is achieved by initially allowing current to flow through the diode in the forward direction, and then limiting the current within a specific range when the reverse breakdown is triggered. This allows the diode to regulate the voltage in the circuit.When used for reverse voltage protection in circuits, the BZG05C39-HM3-18 will ensure that the voltage applied to a circuit does not exceed the specified limit. In this application the diode will act to shunt away any excess voltage, preventing any damage to the underlying circuit.In summary, the BZG05C39-HM3-18 is a single zener diode designed for use in low voltage circuit applications. It has a maximum voltage rating of 18V, a power dissipation of 100mW, an operating temperature range of -40°C to +85°C and a zener voltage of 18V. It is used to regulate voltage and provide protection against over-voltage and voltage spikes. It can be used in power supplies, signal conditioning, audio and video equipment, automotive electronics, computers and telecommunications equipment.

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