Description
HZ9A2 (9A2) Technical Overview
The HZ9A2 is typically designed for use in voltage stabilization circuits where a precise, low-noise reference is required.
Key Specifications (Typical)
| Parameter | Specification |
| Nominal Zener Voltage ($V_Z$) | ~9.1V (Nominal) |
| Power Dissipation ($P_D$) | 400mW – 500mW |
| Package Type | DO-35 (Glass Axial Lead) |
| Configuration | Unidirectional |
| Application | Stabilized Power Supply / Voltage Reference |
Important Identification Notes
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Marking Ambiguity: Because many manufacturers use proprietary codes, a “9A2” mark could theoretically belong to different parts from different vendors. Always look for the manufacturer’s logo on the packaging or the full part number if available.
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Visual Inspection: These are often found in glass DO-35 packages. The cathode is indicated by a colored band on one end of the glass body.
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Verification: If you are repairing a board, check the PCB silkscreen near the component. If it is labeled “ZD” or “DZ”, it is confirmed to be a Zener diode. If it is labeled “D”, it could potentially be a standard switching diode (like a 1N4148), so be careful not to confuse the two.
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