Description
1N4739A 9.1V Zener Voltage Regulator Diode
Product Overview
The 1N4739A is a high-precision, 1-watt Zener diode designed to provide stable voltage regulation in electronic circuits. By maintaining a constant reference voltage of 9.1V across a wide range of currents, it serves as a fundamental building block for power supply stability, overvoltage protection, and voltage reference applications.
This component is housed in a rugged DO-41 axial-lead package, offering excellent power dissipation capabilities and thermal reliability. Whether used to clamp voltage spikes to protect sensitive logic components or to create a steady reference rail for analog instrumentation, the 1N4739A is a trusted industry standard for reliable voltage management.
Key Features
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Precision Voltage Regulation: Specifically calibrated for a nominal Zener voltage ($V_Z$) of 9.1V, ensuring consistent output even when input voltages fluctuate.
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1W Power Dissipation: Engineered to handle up to 1 watt of power, making it suitable for circuits requiring more thermal robustness than standard signal-level Zeners.
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High Stability: Provides a sharp breakdown characteristic, essential for maintaining tight voltage tolerances in demanding analog and digital circuits.
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Rugged Construction: The DO-41 glass-passivated package offers superior environmental protection and reliable performance in both industrial and consumer-grade assemblies.
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Low Dynamic Impedance: Ensures minimal voltage variation as current changes, providing a cleaner, more stable regulated voltage rail.
Technical Specifications
| Parameter | Specification |
| Component Type | Zener Voltage Regulator Diode |
| Nominal Zener Voltage ($V_Z$) | 9.1V |
| Power Dissipation ($P_D$) | 1W |
| Test Current ($I_{ZT}$) | 28mA |
| Package Type | DO-41 (Axial Lead) |
| Operating Temperature | -65°C to +200°C |
| Tolerance | $\pm 5\%$ |
Applications
The ideal choice for voltage stabilization and circuit protection:
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Voltage Regulation: Perfect for creating simple, cost-effective 9.1V regulated power rails from higher supply voltages.
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Overvoltage Protection: Functions as a shunt regulator to clamp transient voltage spikes and protect sensitive downstream components like microcontrollers or sensors.
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Reference Voltage Source: Provides a stable voltage reference for analog-to-digital converters (ADCs), op-amps, and precision measurement equipment.
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Level Shifting: Useful in signal-conditioning circuits to shift or limit signal levels to compatible voltage thresholds.
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