Microchip Technology 1N5269A

Overview

1N5269A from Microsemi is a 87 V, ±10% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 1.4 mA test current and 2200 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 1N5269A datasheet, 1N5269A pinout, 1N5269A application, or 1N5269A equivalent, this page delivers verified electrical parameters, thermal derating behavior, Zener voltage temperature coefficient (+0.099 %/°C), DO-35 mechanical dimensions, and RoHS-compliant packaging options with e3 suffix.

Technical Context

This device operates in reverse-biased breakdown mode with a sharp knee at 87 V nominal Zener voltage, validated at IZT = 1.4 mA and characterized for stable regulation across –65°C to +175°C ambient range. Its 2200 Ω Zener impedance at IZK = 0.25 mA confirms low dynamic resistance near knee region.

Thermal resistance is 250 °C/W junction-to-lead (3/8″ lead length) and 310 °C/W junction-to-ambient on FR4 board; maximum steady-state power is 0.5 W at TL < 50°C or 0.48 W at TA < 25°C. Forward voltage is ≤1.5 V at 200 mA.

Key Specifications

Pinout & Package

DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode indicated by colored 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 regulation applications.

Compared with 1N5269B and MMBZ5269B, the 1N5269A provides optimal balance of cost, legacy compatibility, and thermal robustness for through-hole industrial systems-offering ±10% tolerance at full 500 mW rating and proven DO-35 reliability across extreme temperatures.

Availability

1N5269A is available at Aetrix Electronics and suitable for industrial power supply feedback, aerospace voltage reference, and overvoltage protection clamp applications requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for 1N5269A 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-temperature analog components.

The 1N52xx series was designed for mission-critical voltage regulation in aerospace, defense, and industrial systems where long-term stability, wide temperature operation, and JEDEC-standardized form factor are mandatory.

FAQ

What is the nominal Zener voltage and tolerance of the 1N5269A?

The 1N5269A has a nominal Zener voltage of 87 V with a guaranteed tolerance of ±10%, as defined by the "A" suffix per Microsemi's datasheet. This tolerance applies under standard test conditions (IZT = 1.4 mA, TA = 25°C) and is validated across the full operating temperature range of –65°C to +175°C. The 1N5269A is not rated for tighter tolerances unless re-screened or replaced with 1N5269B (±5%).

What is the maximum power dissipation and thermal derating behavior of the 1N5269A?

The 1N5269A is rated for 500 mW at 25°C ambient or lead temperature < 50°C (3/8″ from body). Power must be linearly derated above 25°C at 4.0 mW/°C (based on 250 °C/W junction-to-lead thermal resistance). At 100°C, maximum dissipation drops to 300 mW. Mounting on FR4 with specified copper pads reduces derating margin due to higher 310 °C/W junction-to-ambient resistance.

How is polarity marked and how should the 1N5269A be connected in circuit?

The 1N5269A uses a cathode band to indicate polarity: the banded end is the cathode and must be held at a higher potential than the anode to achieve Zener regulation. In shunt regulator configurations, the cathode connects to the voltage rail being regulated, while the anode connects to ground or a lower reference. Reversing polarity subjects the device to forward conduction (VF ≤ 1.5 V @ 200 mA), not regulation.

Is the 1N5269A RoHS compliant and what suffix indicates compliance?

Yes, the 1N5269A is available in RoHS-compliant form with the "e3" suffix (e.g., 1N5269Ae3), indicating annealed matte-tin plating per MIL-STD-750 Method 2026. Standard 1N5269A parts use tin-lead plating unless otherwise specified. Both versions share identical electrical and thermal specifications; only the finish differs for environmental compliance.

What is the Zener impedance and why does it matter for regulation stability?

The 1N5269A exhibits 2200 Ω dynamic impedance (ZZT) measured at IZK = 0.25 mA, reflecting its small-signal AC resistance in breakdown. Lower impedance improves load regulation and ripple rejection - this value confirms stable knee behavior per Microsemi's screening. At higher currents (e.g., IZT = 1.4 mA), impedance drops further, but 2200 Ω governs performance in low-current bias networks and precision references.