Description
1N4749 24V Zener Voltage Regulator Diode
Product Overview
The 1N4749 is a precision-engineered, 1-watt Zener diode designed to maintain a stable, fixed reference voltage of 24V. It is a critical component for power supply regulation, overvoltage protection, and voltage level shifting, particularly in industrial and automotive systems where 24V rails are standard. By operating in the Zener breakdown region, this diode effectively “clamps” voltage at the 24V threshold, ensuring that downstream sensitive electronics are protected from supply fluctuations and damaging high-voltage surges.
Housed in a rugged DO-41 axial-lead package, the 1N4749 offers excellent thermal dissipation and long-term operational reliability. It is a preferred choice for engineers developing industrial automation systems, PLC-based control logic, and custom power management solutions where a stable 24V reference is required.
Key Features
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Precision 24V Regulation: Specifically calibrated for a nominal Zener voltage of 24V, providing a dependable voltage benchmark for high-voltage industrial control and analog circuits.
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1W Power Dissipation: Engineered to handle up to 1 watt of power, offering the thermal headroom necessary for reliable operation in sustained regulation applications.
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Sharp Breakdown Characteristic: Features a tight transition into regulation, which minimizes voltage ripple and ensures a steady output even when input voltages vary.
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Rugged Construction: The DO-41 glass-passivated package is designed for endurance, resisting environmental moisture and thermal cycling in professional-grade assemblies.
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Ease of Assembly: Standard axial-lead design simplifies integration into both prototyping breadboards and permanent through-hole PCB layouts.
Technical Specifications
| Parameter | Specification |
| Component Type | Zener Voltage Regulator Diode |
| Nominal Zener Voltage ($V_Z$) | 24V |
| Power Dissipation ($P_D$) | 1W |
| Test Current ($I_{ZT}$) | 10.5mA |
| Package Type | DO-41 (Axial Lead) |
| Operating Temperature | -65°C to +200°C |
Applications
The go-to solution for 24V rail stabilization and transient protection:
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Voltage Regulation: Ideal for creating stable 24V power supplies for PLC I/O modules, industrial sensors, and solenoids.
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Overvoltage Protection: Functions as a shunt regulator to clamp transient voltage spikes, safeguarding sensitive components on 24V supply lines.
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Signal Conditioning: Useful for clamping or shifting signal levels in automated factory systems where 24V thresholds are mandatory.
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Voltage Referencing: Serves as a fixed, stable 24V reference for analog-to-digital conversion and high-side driver circuitry.
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