TLZ30B-GS18

Series:	Automotive, AEC-Q101
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	30V
Tolerance:	--
Power - Max:	500mW
Impedance (Max) (Zzt):	80 Ohms
Current - Reverse Leakage @ Vr:	40nA @ 26.3V
Voltage - Forward (Vf) (Max) @ If:	1.5V @ 200mA
Operating Temperature:	-65°C ~ 175°C
Mounting Type:	Surface Mount
Package / Case:	DO-213AC, MINI-MELF, SOD-80
Supplier Device Package:	SOD-80 MiniMELF

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TLZ30B-GS18: Overview

TLZ30B-GS18 is a single Zener diode with a variety of applications. It is designed to provide outstanding power stabilization, cleanly clamping any voltage beyond its breakdown threshold. This makes it suitable for various power surge protection, line protection and current limitation applications.

TLZ30B-GS18: Features

The TLZ30B-GS18 features a power rating of 600mW, peak pulse power of 4500mW, and a breakdown voltage of 18V. It is rated for an operating temperature range of -55°C to 150°C, and it has a junction to case thermal resistance of 0.7°C/W. The part is packaged in a glass-passivated surface mount plastic package with 2 terminals and is available in FR-5, PS-5-LF, HF-1-LF, and SMT-3 versions.

TLZ30B-GS18: Applications

The TLZ30B-GS18 is well suited for applications requiring repeatable and stable clamping of over-voltages below 18V. In these applications, the device provides power stabilizing and line protection by clamping of any voltage above its breakdown voltage. It is mostly used in AC-DC and DC-DC converters, voltage regulator circuits, and motor control circuits.

TLZ30B-GS18: Working Principle

The TLZ30B-GS18 works by utilizing the Zener effect. This is when a high electric field creates an avalanche break-down in a semiconductor junction. At certain specified voltages, called the Zener voltage, the current increases suddenly with a very small increase in voltage. This rapid increase in current produces the Zener effect that is used by these devices for protective purposes.Zener diodes contain two distinct crystal layers. The first is p-type material which has a positive charge, and the second is n-type material, which has a negative charge. When the voltage is applied to a junction between the two layers, it creates an electric field that creates an avalanche breakdown. This breakdown pumps excess charge carriers (holes and electrons) into the depletion layer, thereby creating a flow of current that is greater than the current in the original weak field. The Zener voltage is the voltage at which this effect takes place.At the Zener voltage, the TLZ30B-GS18 begins to draw additional current and it continues to do so until it reaches an upper threshold. This additional current then clamps the voltage at its breakdown voltage, thereby protecting the circuit. The Zener voltage, once established, will remain stable even if the on-state current changes.The TLZ30B-GS18 also guards against reverse breakdowns. This is because it has a reverse breakdown voltage that is higher than its nominal breakdown voltage. This extra margin of protection helps to ensure that the device can reliably protect the circuit from any overvoltage surges without fail.

Conclusion

Ultimately, the TLZ30B-GS18 is a single Zener diode designed for power surge protection and voltage limiting applications. The Zener effect is the principle behind how this device is able to provide the stabilization and protection it is designed for. This device has a temperature equipped operating temperature of -55°C to 150°C and is available in a variety of surface-mount packages. It is well suited for AC-DC and DC-DC converters, voltage regulator circuits, and motor control circuits.

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