Description
BZX79-C33 33V Zener Voltage Regulator Diode
Product Overview
The BZX79-C33 is a high-reliability, 500mW Zener diode designed for precision voltage regulation and transient suppression. Featuring a nominal Zener voltage of 33V, this component is ideal for establishing stable voltage references in higher-voltage control systems, protecting sensitive downstream components from inductive kickback, and providing reliable signal clamping in industrial electronic interfaces.
Housed in the industry-standard DO-35 glass-encapsulated package, the BZX79-C33 combines high thermal reliability with a compact form factor. This makes it a primary choice for high-density PCB designs where maintaining a stable 33V rail or clamping voltage spikes is critical for system integrity.
Key Features
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Precision 33V Regulation: Specifically calibrated for a nominal Zener voltage of 33V, offering a dependable benchmark for high-voltage logic and analog biasing.
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500mW Power Dissipation: Provides an optimized balance between thermal handling and board space, suitable for a wide range of low-to-medium power control applications.
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Stable Breakdown Characteristics: Engineered for a sharp transition into regulation, which effectively minimizes voltage ripple and ensures steady output under variable load conditions.
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Compact DO-35 Package: The miniature axial-lead design allows for efficient high-density population on printed circuit boards.
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Environmental Robustness: The glass-passivated construction ensures consistent performance and longevity against environmental moisture, heat, and vibration.
Technical Specifications
| Parameter | Specification |
| Component Type | Zener Voltage Regulator Diode |
| Nominal Zener Voltage ($V_Z$) | 33V |
| Power Dissipation ($P_D$) | 500mW |
| Test Current ($I_{ZT}$) | 2.5mA |
| Package Type | DO-35 (Axial Lead) |
| Tolerance | $\pm 5\%$ (C-suffix) |
| Operating Temperature | -65°C to +200°C |
Applications
The go-to solution for 33V rail stabilization and transient protection:
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Voltage Regulation: Ideal for maintaining fixed 33V bias voltages in communication interfaces, specialized industrial sensors, and high-voltage signal conditioning.
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Overvoltage Protection: Functions as a protective shunt to “clamp” transient spikes, shielding sensitive microcontrollers or logic circuits from higher-voltage surges.
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Signal Level Shifting: Effectively limits signals in custom control systems to a maximum threshold of 33V.
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Reference Voltage Generation: Provides a fixed reference point for high-voltage monitor circuits and precision analog instrumentation.
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