Description
1N4748 22V Zener Voltage Regulator Diode
Product Overview
The 1N4748 is a precision-engineered, 1-watt Zener diode designed to maintain a stable, fixed reference voltage of 22V. It serves as a vital component for voltage regulation, transient suppression, and reference generation in a wide range of electronic circuits. By operating in the Zener breakdown region, this diode effectively “clamps” voltage at the 22V 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 1N4748 is built to provide excellent thermal dissipation and long-term operational reliability. It is a preferred choice for engineers developing industrial automation systems, precision measurement instrumentation, and custom power management solutions where a stable 22V rail is required.
Key Features
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Precision 22V Regulation: Specifically calibrated for a nominal Zener voltage of 22V, providing a dependable voltage benchmark for higher-voltage 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 industrial-grade assemblies.
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Ease of Assembly: The 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 ($V_Z$) | 22V |
| Power Dissipation ($P_D$) | 1W |
| Test Current ($I_{ZT}$) | 11.5mA |
| Package Type | DO-41 (Axial Lead) |
| Operating Temperature | -65°C to +200°C |
Applications
The go-to solution for 22V rail stabilization and transient protection:
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Voltage Regulation: Ideal for creating stable 22V power supplies for analog sensors, precision op-amps, and specialized industrial modules.
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Overvoltage Protection: Functions as a shunt regulator to clamp transient voltage spikes, safeguarding sensitive components on 22V supply lines.
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Signal Conditioning: Useful for clamping or shifting signal levels in complex control systems where a 22V threshold is mandatory.
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Voltage Referencing: Serves as a fixed, stable 22V reference for analog-to-digital conversion and high-side driver circuitry.
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