ZM4730A-GS18 vs 1SMB5931 M4G
| Part Number |
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| Category | Diodes - Zener - Single | Diodes - Zener - Single |
| Manufacturer | Vishay Semiconductor - Diodes Division | Taiwan Semiconductor Corporation |
| Description | DIODE ZENER 3.9V 1W DO213AB | DIODE ZENER 18V 3W DO214AA |
| Package | Tape & Reel (TR) | Tape & Reel (TR) |
| Series | Automotive, AEC-Q101 | - |
| Operating Temperature | 175°C | -55°C ~ 150°C (TJ) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | DO-213AB, MELF (Glass) | DO-214AA, SMB |
| Supplier Device Package | DO-213AB | DO-214AA (SMB) |
| Tolerance | ±5% | ±5% |
| Power - Max | 1 W | 3 W |
| Voltage - Forward (Vf) (Max) @ If | - | - |
| Current - Reverse Leakage @ Vr | 50 µA @ 1 V | 1 µA @ 13.7 V |
| Voltage - Zener (Nom) (Vz) | 3.9 V | 18 V |
| Impedance (Max) (Zzt) | 9 Ohms | 12 Ohms |
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1. What is the difference between a diode and a Zener diode?
While a normal diode is mainly used for unidirectional current flow, a Zener diode is designed to provide a stable voltage reference point when reverse biased. A normal diode conducts when forward biased and does not conduct or has only a small leakage current when reverse biased; a Zener diode can start conducting after reaching a specific reverse voltage (called the Zener voltage).
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2. 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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3. Where are Zener diodes used in real life?
Applied to power adapters, overvoltage protection in electronic devices, LED drive circuits, etc.
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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.
