Microchip Technology 1N5268BUR-1

Overview

1N5268BUR-1 from Microsemi is a 82 V, ±5% tolerance, 500 mW surface-mount Zener diode in DO-213AA (SOD-80/MELF) glass package, designed for precision voltage regulation in power supply feedback loops, reference circuits, and overvoltage protection at junction temperatures up to +175 °C.

For engineers reviewing the 1N5268BUR-1 datasheet, 1N5268BUR-1 pinout, 1N5268BUR-1 application, or 1N5268BUR-1 equivalent, key selection criteria include Zener voltage temperature coefficient (+0.098 %/°C), dynamic impedance (330 Ω @ 1.5 mA), reverse leakage (≤0.1 µA @ 65 V), and hermetic metallurgical bonding for high-reliability industrial and aerospace environments.

Technical Context

This device operates as a two-terminal voltage reference in reverse-biased breakdown mode, with regulation specified at I_ZT = 1.5 mA and characterized across -65 °C to +175 °C. Its low capacitance (typ. <1.5 pF at 1 MHz) and radiation-hardened construction per MicroNote 050 support stable performance in EMI-sensitive and space-grade applications.

The DO-213AA package enables surface-mount assembly with end-cap soldering per MIL-STD-750 Method 2026, and thermal resistance of 100 °C/W junction-to-end-cap supports operation at T_EC < 125 °C under 500 mW dissipation - critical for compact, thermally constrained PCB layouts.

Key Specifications

Pinout & Package

DO-213AA (SOD-80/MELF) is a cylindrical, hermetically sealed glass surface-mount package with two solderable end caps. Cathode polarity is marked by a single band; the banded end is positive during Zener operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener voltage regulation applications.

Compared with 1N5268B-1 and BZX55C82, the 1N5268BUR-1 delivers superior reliability via metallurgical bonding and hermetic glass packaging - essential for aerospace, defense, and downhole electronics where field failure is unacceptable.

Availability

1N5268BUR-1 is available at Aetrix Electronics and suitable for industrial power supplies, aerospace voltage references, automotive engine control units, and test equipment calibration requiring stable component supply across extended temperature and radiation environments.

Supply support for 1N5268BUR-1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microsemi Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.

The 1N52xxBUR-1 series belongs to Microsemi's legacy Zener regulator product line, engineered specifically for applications demanding hermetic sealing, metallurgical bonding, and verified radiation hardness - targeting mission-critical systems where parameter stability under extreme stress is non-negotiable.

FAQ

What is the Zener voltage tolerance and test current for the 1N5268BUR-1?

The 1N5268BUR-1 has a nominal Zener voltage of 82 V with a ±5% tolerance, measured at a test current I_ZT of 1.5 mA. This tolerance is guaranteed per the "B" suffix in the part number and applies across the full operating temperature range of -65 °C to +175 °C, making the 1N5268BUR-1 suitable for precision reference applications where consistent regulation is required despite thermal variation.

Does the 1N5268BUR-1 have radiation hardness certification?

Yes, the 1N5268BUR-1 is inherently radiation hard per Microsemi MicroNote 050, which documents its performance under total ionizing dose (TID) exposure. While not individually certified per MIL-STD-883, this characterization supports use in low-earth orbit (LEO) and other radiation-prone environments - a key differentiator versus standard commercial Zeners like the BZX55C82, which lack published radiation data. The 1N5268BUR-1's hermetic DO-213AA package further enhances survivability.

What is the maximum reverse leakage current for the 1N5268BUR-1, and at what voltage is it specified?

The maximum reverse leakage current for the 1N5268BUR-1 is 0.1 µA, specified at a reverse voltage (V_R) of 65 V. This ultra-low leakage ensures minimal error contribution in high-impedance reference divider networks and maintains regulation accuracy even in battery-powered or low-power monitoring circuits. The value is confirmed in the Electrical Characteristics table on page 3 of the official Microsemi datasheet T4-LDS-0232-1.

Can the 1N5268BUR-1 be used in surface-mount reflow processes, and what is its peak solder temperature rating?

Yes, the 1N5268BUR-1 supports standard surface-mount reflow assembly with a peak solder temperature rating of 260 °C for 10 seconds, compliant with J-STD-020. Its DO-213AA package uses tin-lead or RoHS-compliant matte-tin end-cap plating, solderable per MIL-STD-750 Method 2026. Thermal resistance junction-to-end-cap is 100 °C/W, so proper pad layout per the datasheet's recommended footprint is essential to avoid exceeding the 125 °C end-cap temperature limit during sustained 500 mW operation.

How does the temperature coefficient of the 1N5268BUR-1 affect its regulation accuracy over temperature?

The 1N5268BUR-1 has a positive temperature coefficient of +0.098 %/°C, meaning its Zener voltage increases by approximately 80.6 mV per °C rise above 25 °C. For example, over a -40 °C to +105 °C range, the total drift is ~14.1 V - a 17.2% shift relative to 82 V. Designers must account for this in feedback compensation or use it in conjunction with complementary TC components. This coefficient is measured per Note 3 on page 4 of the datasheet, confirming stability under regulated current conditions.