1N3031B-1

Overview

The 1N3031B-1 is a 1-watt Zener diode manufactured by Microchip Technology, designed for through-hole mounting in DO-204AL (DO-41) axial packages. It features a nominal Zener voltage of 30 V with a tight tolerance of ±5%. The device operates within an extended temperature range from -55°C to +175°C and exhibits a maximum Zener impedance of 40 Ohms at the test current. Reverse leakage current is specified at 10 µA when measured at 22.8 V. The forward voltage drop is limited to 1.2 V at a forward current of 200 mA. This component is available in JAN, JANTX, and JANTXV grades per MIL-PRF-19500/115.

Feature Summary

• Metallurgically bonded construction ensures robust mechanical integrity and thermal stability under demanding conditions.
• Extended operating temperature range supports reliable performance in high-temperature environments up to 175°C.
• Tight voltage tolerance provides precise regulation capabilities for sensitive circuit applications.

Applications

• Voltage reference circuits requiring stable DC levels
• Overvoltage protection stages in power supplies
• Clamping applications in signal conditioning paths

Procurement Notes

Verify the specific grade suffix (JAN, JANTX, or JANTXV) required for your application, as these denote different reliability standards under MIL-PRF-19500/115. Confirm that the DO-204AL package aligns with your PCB footprint requirements. Ensure that the thermal derating characteristics are considered if the ambient temperature exceeds 95°C, as power dissipation must be reduced accordingly to maintain device safety.

Selection Notes

Select this component when a 30 V regulation point is needed with high precision and wide temperature capability. The ±5% tolerance makes it suitable for applications where standard commercial tolerances are insufficient. Consider the 1 W power rating and axial leaded format for designs requiring manual assembly or through-hole technology compatibility. Evaluate the 40 Ohm impedance against load variations to ensure adequate regulation performance.

Part Context

This part belongs to the 1N3031 series of 1-watt Zener diodes produced by Microchip Technology. The series includes various voltage options ranging from 1N3016 to 1N3045, all sharing similar physical dimensions and electrical characteristics profiles. The -1 suffix typically indicates a specific manufacturing lot or revision within the standard product line, distinct from the military-grade variants which carry additional prefixes.

Replacement Considerations

Direct substitutes include other 1N3031 variants such as 1N3031B or 1N3031B-1 from compatible manufacturers, provided they meet the 30 V, 1 W, and ±5% specifications. Military-grade equivalents like JANTX1N3031B-1 offer higher reliability but may require qualification review. Ensure any replacement maintains the DO-204AL package and thermal derating curves.