1N5543B

Single Zener Diodes Overview

The Microchip Technology 1N5543B is a low voltage avalanche Zener diode with a nominal breakdown voltage of 25 V and a ±5% tolerance. It operates within a power dissipation rating of 0.5 W and features a hermetically sealed axial-lead glass DO-35 (DO-204AH) package. The device supports an operating temperature range from -65°C to +175°C, with a maximum reverse leakage current of 10 µA at 22.4 V and a dynamic impedance of 100 Ohms.

Single Zener Diodes Feature Summary

• Hermetically sealed axial-lead glass construction for environmental stability
• Low noise density characteristics suitable for precision regulation
• Inherently radiation hard design compliant with MIL-STD-750 Method 1020
• Minimal capacitance profile for high-frequency signal integrity

Single Zener Diodes Applications

• Voltage regulation across broad operating current ranges
• Precision reference circuits requiring stable breakdown voltage
• Harsh environment electronics utilizing radiation-hardened components
• Temperature-compensated circuit designs

Single Zener Diodes Procurement Notes

Verify the specific suffix configuration against the datasheet nomenclature table to ensure correct voltage tolerance and metallurgical bond options. Confirm RoHS compliance status as it varies by commercial grade availability. Check manufacturing origin details regarding Microsemi or Microchip Technology branding transitions. Validate package dimensions against DO-35 specifications before integration into PCB layouts.

Single Zener Diodes Selection Notes

Select this component when a 25 V breakdown voltage with tight ±5% tolerance is required in a through-hole axial package. Consider the 0.5 W power rating and thermal resistance values for derating calculations. Evaluate the low noise density specification if the application involves sensitive analog signal processing. Ensure the operating temperature range aligns with the specified -65°C to +175°C limits.

Single Zener Diodes Part Context

This part belongs to the 1N5518B through 1N5546B series of low voltage avalanche Zener diodes manufactured by Microchip Technology. The series offers various voltage selections from 3.3 V to 33 V with different tolerance options. The 1N5543B specifically targets applications needing a 25 V regulated output in a standard DO-35 package.

Single Zener Diodes Replacement Considerations

Consult the manufacturer's cross-reference documentation for verified equivalents. Verify that any substitute maintains the same DO-35 package footprint and 25 V nominal voltage. Ensure replacement parts meet the same MIL-PRF-19500/437 qualification levels if military-grade reliability is required.