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The Microchip Technology 1N4438S is a silicon planar Zener diode designed for voltage regulation and reference applications. It features a nominal Zener voltage of 39V at a test current of 3.2mA, with a maximum impedance of 55 Ohms. The device operates within a temperature range of -65°C to +175°C and is housed in the DO-213AA (SOD-80) surface-mount package. Key electrical characteristics include a maximum leakage current of 1µA at reverse voltage and a power dissipation rating of 500mW. This component is suitable for precision voltage clamping and protection circuits requiring stable performance across wide thermal conditions.
Verify the specific suffix 'S' against the manufacturer's official datasheet to confirm the exact package type and tape-and-reel specifications. Ensure that the required Zener voltage tolerance and power dissipation ratings align with the system design constraints before procurement. Cross-reference the RoHS compliance status with the latest production documentation.
Select this component when a 39V Zener voltage is required in a compact surface-mount form factor. Consider the 55 Ohm impedance and 500mW power rating to ensure adequate performance under expected load conditions. Verify that the 175°C maximum junction temperature meets the environmental requirements of the target application.
The 1N4438S belongs to Microchip Technology's line of discrete semiconductor devices, specifically within the Zener diode category. These components are engineered for reliable voltage control in electronic systems. The 'S' designation typically indicates a specific surface-mount packaging variant, distinguishing it from through-hole equivalents in the same voltage series.
Consult the official Microchip replacement guide or equivalent manufacturer datasheets for direct pin-compatible substitutes. Verify that any alternative component matches the 39V Zener voltage, 55 Ohm impedance, and DO-213AA package dimensions to ensure seamless integration without circuit redesign.