1N5256A

Single Zener Diodes Overview

The Microchip Technology 1N5256A is a 0.5-watt glass axial-lead Zener voltage regulator in the JEDEC registered 1N5221 to 1N5281B series. It provides a nominal Zener voltage of 30 V with a standard tolerance of plus/minus 10%, indicated by the 'A' suffix. The device operates within an ambient temperature range of -65°C to +175°C and features a hermetically sealed DO-35 (DO-204AH) package. Electrical characteristics include a maximum reverse current of 20 μA at 20 V, a Zener impedance of 49 Ohms at a test current of 4.2 mA, and a positive voltage temperature coefficient of +0.091 %/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction for environmental stability
• Regulates voltage across a broad operating current and temperature range
• Minimal capacitance suitable for high-frequency applications
• Inherently radiation hard per MicroNote 050

Single Zener Diodes Applications

• Voltage regulation in power supply circuits
• Reference voltage generation in electronic instrumentation
• Overvoltage protection in sensitive signal lines

Single Zener Diodes Procurement Notes

Verify the specific ordering suffix against the manufacturer's nomenclature to confirm tolerance and screening levels. Confirm RoHS compliance status if required, as it depends on the presence of the 'e3' suffix. Ensure the procurement specification matches the required MIL-PRF-19500 screening prefix if military-grade reliability is mandated.

Single Zener Diodes Selection Notes

Select this component when a precise 30 V reference is needed with a 10% tolerance. Consider the B suffix variant if a tighter 5% tolerance is required. Evaluate the thermal derating curve for high-power dissipation scenarios and verify lead length requirements for accurate electrical testing during integration.

Single Zener Diodes Part Context

This part belongs to the popular 1N5221 through 1N5281B series of 0.5-watt Zener diodes. The series offers a wide selection of voltages from 2.4 to 200 volts. The 1N5256A specifically targets the 30-volt segment of this extensive lineup, providing a standardized solution for mid-range voltage regulation needs in commercial and industrial electronics.

Single Zener Diodes Replacement Considerations

Equivalent surface mount options are available in the MLL5221 to MLL5281B series using the DO-213AA MELF package. For higher power requirements, consider the 1N5913BG to 1N5956BG series which offer 1.5-watt ratings.