Microchip Technology 1N5271BE3

Overview

1N5271BE3 from Microsemi is a 100 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 1.3 mA test current and 2600 Ω dynamic impedance at 0.25 mA, operating from −65 °C to +175 °C. It serves as a precision voltage reference or overvoltage clamp in low-power analog circuits, power supply feedback loops, and industrial sensor conditioning stages.

For engineers reviewing the 1N5271BE3 datasheet, 1N5271BE3 pinout, 1N5271BE3 application, or 1N5271BE3 equivalent, key selection criteria include its 100 V nominal Zener voltage, tight ±5% tolerance (B suffix), RoHS-compliant matte-tin plating (e3 suffix), and verified thermal resistance of 250 °C/W junction-to-lead at 10 mm lead length.

Technical Context

This device operates in reverse breakdown mode with cathode band indicating the positive terminal during regulation. Its Zener voltage exhibits a +0.110 %/°C temperature coefficient above 25 °C, measured at rated I_ZT (1.3 mA) between 25 °C and 125 °C per MicroNote 202.

It delivers stable regulation across 0.25 mA to 1.3 mA operating current range, with maximum reverse leakage of 0.1 μA at 72 V and forward voltage ≤1.5 V at 200 mA - enabling use in low-current bias networks and high-impedance sensing interfaces without loading error.

Key Specifications

Pinout & Package

Hermetically sealed DO-35 (DO-204AH) glass axial-leaded package with tin-lead or RoHS-compliant matte-tin plating. Cathode identified by single black band; device operated with banded end positive relative to unbanded end during Zener regulation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5271B and MMBZ5271B, the 1N5271BE3 uniquely combines RoHS compliance, hermetic glass packaging, and axial-leaded mechanical robustness - making it optimal for high-reliability through-hole applications where solder joint integrity and long-term stability outweigh footprint savings.

Availability

1N5271BE3 is available at Aetrix Electronics and suitable for industrial power supply feedback, aerospace voltage clamp, and test equipment calibration reference requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 1N5271BE3 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 (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 1N52xx series was designed specifically for precision voltage regulation in mission-critical systems where long-term stability, extreme temperature operation, and radiation tolerance are mandatory - not general-purpose consumer applications.

FAQ

What is the Zener voltage tolerance of the 1N5271BE3?

The 1N5271BE3 has a nominal Zener voltage of 100 V with a guaranteed tolerance of ±5%, indicated by the "B" suffix in the part number. This means the actual breakdown voltage falls within 95 V to 105 V when tested at 1.3 mA and 25 °C, per JEDEC JESD24 compliance and Microsemi's published electrical characteristics table.

Does the 1N5271BE3 require heatsinking in standard PCB mounting?

No, the 1N5271BE3 does not require external heatsinking when operated at ≤500 mW and ambient temperatures below 50 °C with 10 mm lead length from the glass body. Its thermal resistance is 250 °C/W junction-to-lead; exceeding this condition triggers linear derating per Figure 1 in the datasheet, but typical 1N5271BE3 applications remain within safe limits without added copper or airflow.

How is polarity marked on the 1N5271BE3 package?

The 1N5271BE3 uses a single black band on the glass DO-35 body to identify the cathode terminal. During Zener regulation, the banded end must be held positive relative to the unbanded (anode) end. This marking is consistent across all 1N52xx series devices and aligns with JEDEC DO-204AH mechanical standards.

Can the 1N5271BE3 be used in place of the 1N5271B?

Yes, the 1N5271BE3 is a direct RoHS-compliant replacement for the 1N5271B, sharing identical electrical specifications, DO-35 package dimensions, and thermal performance. The only difference is the annealed matte-tin plating (e3 suffix) versus traditional tin-lead plating - no circuit or layout changes are needed for substitution in new designs.

What is the maximum reverse leakage current for the 1N5271BE3?

The maximum reverse leakage current for the 1N5271BE3 is 0.1 μA when measured at 72 V (0.72 × V_Z) and 25 °C. This value is confirmed in the "Max Reverse Current" column of the Electrical Characteristics table for JEDEC Type No. 1N5271, and applies to both B and e3-suffixed variants per Microsemi's revision D datasheet.