Description
1N4746 18V Zener Voltage Regulator Diode
Product Overview
The 1N4746 is a robust, 1-watt Zener diode engineered to provide a stable, fixed reference voltage of 18V. Designed for power management and circuit protection, this component effectively “clamps” voltage at its threshold, ensuring that downstream electronics are shielded from harmful surges while maintaining a clean, consistent voltage rail.
Housed in a durable DO-41 axial-lead package, the 1N4746 offers high thermal reliability and consistent performance in demanding environments. It is an essential component for engineers developing power supply circuits, automotive electronics, or industrial control systems that require a precise 18V reference point.
Key Features
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Precision 18V Regulation: Calibrated to maintain a nominal Zener voltage of 18V, providing a reliable voltage benchmark for circuits requiring this specific threshold.
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1W Power Dissipation: Offers significant thermal headroom, making it a dependable choice for regulation applications that generate more heat than signal-level diodes can handle.
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Tight Breakdown Characteristic: Features a sharp voltage transition, minimizing ripple and providing a steady output even as current varies.
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Rugged Construction: The DO-41 glass-passivated package ensures long-term endurance against environmental moisture and thermal cycling.
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Versatile Integration: Standard axial-lead design allows for easy assembly on both breadboards and permanent PCB through-hole designs.
Technical Specifications
| Parameter | Specification |
| Component Type | Zener Voltage Regulator Diode |
| Nominal Zener Voltage ($V_Z$) | 18V |
| Power Dissipation ($P_D$) | 1W |
| Test Current ($I_{ZT}$) | 14mA |
| Package Type | DO-41 (Axial Lead) |
| Operating Temperature | -65°C to +200°C |
Applications
The go-to solution for 18V rail stabilization and transient suppression:
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Voltage Regulation: Ideal for building stable 18V power supplies for analog circuits, audio equipment, or specialized instrumentation.
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Overvoltage Protection: Functions as a protective shunt to safeguard sensitive components from transient voltage spikes on 18V supply lines.
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Voltage Referencing: Serves as a fixed reference for comparators, ADCs, and high-precision sensor biasing circuits.
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Industrial Control: Essential for signal-level clamping in automated factory machinery where 18V control signals are used.
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