Microchip Technology 1N5265B/TR

Overview

1N5265B/TR from Microsemi is a 62 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 2.0 mA test current and 1400 Ω dynamic impedance at 0.25 mA, operating from –65°C to +175°C. It serves as a precision voltage reference or shunt regulator in low-power analog circuits, power supply feedback loops, and overvoltage protection.

For engineers reviewing the 1N5265B/TR datasheet, 1N5265B/TR pinout, 1N5265B/TR application, or 1N5265B/TR equivalent, key selection criteria include its 62 V nominal Zener voltage, ±5% tolerance (B suffix), 500 mW power rating at 25°C, DO-35 mechanical form factor, and temperature coefficient of +0.097 %/°C - all critical for stable regulation under thermal stress and layout-constrained designs.

Technical Context

This discrete Zener diode operates in reverse breakdown mode with cathode band marking polarity. Its regulation relies on controlled avalanche behavior at 62 V, exhibiting a sharp knee at IZK = 0.25 mA and specified dynamic impedance (ZZK = 1400 Ω) to ensure predictable voltage stability across load variations.

The device features hermetically sealed glass construction, tin-lead or RoHS-compliant matte-tin plating, and is rated for 260°C soldering (10 s). Its radiation-hardened design per MicroNote 050 and ESD insensitivity (MIL-STD-750 Method 1020) support reliability in aerospace and industrial environments.

Key Specifications

Pinout & Package

DO-35 (DO-204AH) glass axial-leaded package: hermetically sealed cylindrical body with 0.2 g mass, 3/8″ (10 mm) lead length standard, tin-lead or RoHS-compliant matte-tin plating, cathode indicated by single black band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5265B/TR, 1N4748A offers higher power but mismatches voltage requirement, while BZX55C62 matches voltage and package but sacrifices impedance and tempco performance - making 1N5265B/TR optimal for 62 V precision regulation where stability and radiation tolerance are mandatory.

Availability

1N5265B/TR is available at Aetrix Electronics and suitable for industrial power supply feedback, aerospace voltage reference, and automotive overvoltage clamp applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 1N5265B/TR 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, radiation-hardened, and high-voltage analog components for defense, aerospace, and industrial markets.

The 1N52xxB series was designed specifically for precision voltage regulation in harsh-environment electronics, emphasizing tight tolerance, wide temperature operation, and intrinsic radiation hardness without external hardening.

FAQ

What is the nominal Zener voltage and tolerance of the 1N5265B/TR?

The 1N5265B/TR has a nominal Zener voltage of 62 V with a tolerance of ±5%, as indicated by the "B" suffix per Microsemi's datasheet. This tolerance is guaranteed across the full operating temperature range of –65°C to +175°C, and the device is tested at 2.0 mA Zener test current (IZT) to confirm compliance. The 1N5265B/TR maintains this specification under JEDEC-registered conditions and is validated for use in precision reference applications where voltage stability is critical.

What package type and mounting configuration does the 1N5265B/TR use?

The 1N5265B/TR uses the DO-35 (DO-204AH) glass axial-leaded package with hermetically sealed construction, 0.2 g mass, and cathode identified by a single black band. It is designed for through-hole mounting with 3/8″ (10 mm) minimum lead length from the body, and accepts standard 260°C soldering for 10 seconds. The 1N5265B/TR's axial leads provide mechanical flexibility and thermal path efficiency, supporting both manual and automated assembly in high-reliability PCBs.

How does the temperature coefficient of the 1N5265B/TR affect its regulation performance?

The 1N5265B/TR has a positive temperature coefficient of +0.097 %/°C, meaning its Zener voltage increases by approximately 60 mV per 10°C rise above 25°C. This behavior is fully characterized per MicroNote 050 and must be factored into thermal design - for example, in a 62 V reference used near a heat-generating IC, a 50°C ambient rise adds ~300 mV offset. The 1N5265B/TR's predictable tempco enables accurate compensation in precision analog circuits without requiring external thermistors.

Is the 1N5265B/TR suitable for radiation-intensive environments such as space applications?

Yes, the 1N5265B/TR is inherently radiation hard per MicroNote 050 and qualified for use in space-grade systems. It exhibits no parametric shift after exposure to total ionizing dose (TID) up to 100 krad(Si), and its glass-encapsulated DO-35 structure provides superior single-event effect immunity compared to plastic-packaged alternatives. The 1N5265B/TR is routinely deployed in satellite power management units and launch vehicle telemetry systems where long-term reliability under radiation is non-negotiable.

What is the maximum reverse leakage current specification for the 1N5265B/TR?

The 1N5265B/TR specifies a maximum reverse leakage current (IR) of 0.1 μA when measured at VR = 47 V - well below its 62 V Zener voltage. This ultra-low leakage ensures minimal quiescent current draw in high-impedance reference nodes and preserves battery life in always-on monitoring circuits. The 1N5265B/TR's leakage remains stable across temperature and is verified per JEDEC test methods, making it suitable for low-power sensor interfaces and precision comparator biasing.