1N5251B

Single Zener Diodes Overview

The Microchip Technology 1N5251B is a single Zener diode housed in a DO-35 (DO-204AH) glass axial-lead package. It provides a nominal Zener voltage of 22 V with a ±5% tolerance, indicated by the 'B' suffix. The device operates at a test current of 5.6 mA and exhibits a maximum Zener impedance of 29 Ohms at this point. Maximum reverse leakage current is specified as 100 nA at 17 V. Power dissipation reaches 500 mW at 25°C, with an operating temperature range from -65°C to +175°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction for robust environmental protection
• Capable of regulating voltage across a broad operating current and temperature range
• Inherently radiation hard per MicroNote 050 specifications
• Minimal capacitance characteristics suitable for high-frequency applications

Single Zener Diodes Applications

• Voltage regulation circuits requiring stable reference levels
• Protection against overvoltage transients in sensitive electronics
• Clamping applications within power supply architectures

Single Zener Diodes Procurement Notes

Verify the specific suffix letter to confirm voltage tolerance accuracy, as the B suffix denotes ±5%. Confirm RoHS compliance status if required, noting that standard versions may differ from e3 compliant variants. Ensure the procurement documentation matches the manufacturer's JEDEC registration type number for guaranteed parameter limits on all six electrical characteristics rather than partial guarantees.

Single Zener Diodes Selection Notes

Select this component when a precise 22 V reference is needed in a through-hole design. The DO-35 package offers flexible mounting terminals for standard PCB layouts. Consider the thermal resistance of 250°C/W junction-to-lead when designing heat dissipation paths. Verify that the application current remains within the safe operating area defined by the derating curve to maintain the 500 mW power rating.

Single Zener Diodes Part Context

This part belongs to the 1N5221 through 1N5281B series of 0.5 W Zener Voltage Regulators manufactured by Microsemi Scottsdale Division, now part of Microchip Technology. The series covers a wide voltage selection from 2.4 V to 200 V. These devices are JEDEC registered and available in various military screening levels using specific prefixes like MQ or MX for enhanced reliability standards.

Single Zener Diodes Replacement Considerations

Direct substitutes include other manufacturers' 1N5251B equivalents meeting identical JEDEC specifications. Surface mount equivalents are available in the MLL5281B series within the DO-213AA MELF style package. Ensure any replacement maintains the same DO-35 axial lead form factor and 500 mW power dissipation capability.