GDZ12B-HG3-08 vs ZM4747A-GS08
| Part Number |
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| Category | Diodes - Zener - Single | Diodes - Zener - Single |
| Manufacturer | Vishay Semiconductor - Diodes Division | Vishay Semiconductor - Diodes Division |
| Description | DIODE ZENER 12V 200MW SOD323 | DIODE ZENER 20V 1W DO213AB |
| Package | Tape & Reel (TR) | Tape & Reel (TR) |
| Series | Automotive, AEC-Q101, GDZ-G | Automotive, AEC-Q101 |
| Operating Temperature | -65°C ~ 150°C | 175°C |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | SC-76, SOD-323 | DO-213AB, MELF (Glass) |
| Supplier Device Package | SOD-323 | DO-213AB |
| Tolerance | ±2% | ±5% |
| Power - Max | 200 mW | 1 W |
| Voltage - Forward (Vf) (Max) @ If | - | - |
| Current - Reverse Leakage @ Vr | 100 nA @ 9 V | 5 µA @ 15.2 V |
| Voltage - Zener (Nom) (Vz) | 12 V | 20 V |
| Impedance (Max) (Zzt) | 30 Ohms | 22 Ohms |
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1. What are Zener diodes used for?
They are mainly used for voltage regulation, protecting circuits from overvoltage damage, and as a voltage reference source.
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2. Are Zener diodes unidirectional?
In normal operation mode, Zener diodes do exhibit unidirectional conductivity, but they start conducting when reverse biased to their Zener voltage.
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3. How to tell if a diode is a Zener diode?
You can tell by looking at its symbol (which is slightly different from ordinary diodes), the description in the data sheet, or by testing its reverse characteristic curve. Using a multimeter, you can also measure its forward and reverse resistance values and the voltage drop under specific conditions.
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4. What happens when a Zener diode fails?
If it is overheated or subjected to excessive current, it may cause permanent damage, which will appear as an open or short circuit state.
