Microchip Technology 1N5265B

Overview

1N5265B 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 paths, and overvoltage protection.

For engineers reviewing the 1N5265B datasheet, 1N5265B pinout, 1N5265B application, or 1N5265B equivalent, key selection factors include its 62 V nominal Zener voltage, 5% tolerance (B suffix), 1400 Ω Zener impedance at IZK = 0.25 mA, temperature coefficient of +0.097 %/°C, and DO-35 mechanical compatibility with axial-leaded through-hole assembly.

Technical Context

The 1N5265B operates as a silicon planar Zener diode with controlled avalanche breakdown at 62 V under reverse bias. Its regulation performance is specified at IZT = 2.0 mA and validated across −65 °C to +175 °C ambient range, with thermal resistance of 250 °C/W junction-to-lead (3/8″ lead length).

It exhibits a positive temperature coefficient (+0.097 %/°C), indicating increasing Zener voltage with rising temperature - a critical factor in temperature-stable reference designs. The device uses hermetically sealed glass encapsulation and tin-lead or RoHS-compliant matte-tin plating per MIL-STD-750.

Key Specifications

Pinout & Package

DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode indicated by color band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5265B, 1N4748A offers higher power but cannot replace it in 62 V circuits, while BZX55C62 matches voltage and package but omits radiation hardening, military screening, and guaranteed six-parameter JEDEC compliance.

Availability

1N5265B is available at Aetrix Electronics and suitable for industrial power supply feedback, overvoltage protection clamps, and precision analog reference designs requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for 1N5265B 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, RF, and radiation-hardened components for aerospace, defense, and industrial markets.

The 1N52xxB series was designed for precision voltage regulation in mission-critical systems demanding wide temperature operation, hermetic reliability, and JEDEC-guaranteed parametric consistency.

FAQ

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

The 1N5265B has a nominal Zener voltage of 62 V with a tolerance of ±5%, as indicated by the "B" suffix per JEDEC registration. This tolerance applies at 25 °C with IZT = 2.0 mA, and the device guarantees full six-parameter compliance including VZ, IR, ZZT, ZZK, αVZ, and VF.

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

The 1N5265B uses a DO-35 (DO-204AH) hermetically sealed glass axial-leaded package. It mounts via through-hole insertion with the banded end designated as the cathode, requiring orientation-aware placement on PCBs for correct Zener operation.

What is the maximum power dissipation and thermal derating behavior of the 1N5265B?

The 1N5265B is rated for 500 mW at 25 °C, with thermal resistance of 250 °C/W junction-to-lead at 3/8″ lead length. Derating begins linearly above 25 °C, reaching zero power at 175 °C - consistent with its −65 °C to +175 °C operating range.

Does the 1N5265B have radiation hardness and military screening options?

Yes, the 1N5265B is inherently radiation-hardened per MicroNote 050. Military screening to MIL-PRF-19500 (JAN, JANTX, JANTXV, JANS) is available by adding MQ, MX, MV, or MSP prefixes respectively - provided the part number includes the "-1" internal bond suffix.

How does the temperature coefficient affect the 1N5265B's performance in precision circuits?

The 1N5265B has a temperature coefficient of +0.097 %/°C, meaning its Zener voltage increases by approximately 60 mV per °C rise at 62 V. This must be accounted for in high-accuracy references using passive compensation or active TC cancellation techniques.