Description
Identification Overview
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Likely Part Identification: The “C22” indicates a nominal Zener voltage of 22V. The “PH” suffix is often a internal batch or factory indicator used by Philips/NXP.
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Common Equivalents: Components marked “C22PH” often correspond to the BZX79-C22 (in a DO-35 glass package) or sometimes the BZV85-C22 (in a larger DO-41 package), depending on the physical size of the component you have.
Technical Specifications (Typical for 22V Zener)
| Parameter | Specification |
| Nominal Zener Voltage ($V_Z$) | 22V |
| Power Dissipation ($P_D$) | 500mW (DO-35) or 1W+ (DO-41) |
| Tolerance | $\pm 5\%$ |
| Configuration | Unidirectional |
| Package Type | Glass Axial Lead (DO-35 or DO-41) |
How to Verify for Your Application
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Check Physical Size:
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DO-35: Small glass body (approx. 4mm long), thin leads. This usually corresponds to the 500mW BZX79 series.
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DO-41: Larger glass body (approx. 5mm long), thicker leads. This usually corresponds to the 1W+ BZV85 series.
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Verify Circuit Context: If the component is placed in parallel with a load (connected to ground) and is intended to stabilize a voltage rail, it is functioning as a shunt regulator. If it is placed across a relay coil or motor, it is functioning as a flyback (protection) diode.
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Use a Multimeter: If the component is removed from the circuit, you can test it using the “Diode Test” mode on a multimeter. It will show a standard forward voltage drop (approx. 0.6V–0.7V) in one direction and behave as an open circuit in the other, unless the test voltage exceeds the Zener voltage (22V).
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