Microchip Technology 1N5276A

Overview

1N5276A from Microsemi is a 150 V, ±10% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 0.85 mA test current, 1500 Ω dynamic impedance at IZK, and operating across –65°C to +175°C. It serves as a precision voltage reference or overvoltage clamp in low-power analog monitoring circuits.

For engineers reviewing the 1N5276A datasheet, 1N5276A pinout, 1N5276A application, or 1N5276A equivalent, this page delivers verified electrical specs, thermal derating behavior, Zener impedance vs. current relationship, temperature coefficient, and direct alternatives with documented tolerance and impedance differences.

Technical Context

The 1N5276A operates as a two-terminal voltage-regulating device relying on controlled reverse-biased avalanche breakdown. Its 150 V nominal Zener voltage is specified at 0.85 mA test current (IZT), with dynamic impedance measured at both IZT and IZK = 0.25 mA - 1500 Ω and 5000 Ω respectively - confirming sharp knee behavior critical for stable regulation under light-load conditions.

It exhibits a +0.110 %/°C temperature coefficient (αVZ) over 25°C–125°C, consistent with high-voltage Zeners in the 1N5271–1N5281 series. The DO-35 glass package provides hermetic sealing, ESD insensitivity per MIL-STD-750 Method 1020, and radiation hardness per MicroNote 050.

Key Specifications

Pinout & Package

DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode indicated by a single black band. Leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026. Weight: 0.2 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5276B and 1N5276C, the 1N5276A offers the lowest-cost option for applications where ±15 V regulation window is acceptable - preserving PCB layout, thermal management, and bill-of-materials continuity while meeting MIL-PRF-19500 Class B screening requirements.

Availability

1N5276A is available at Aetrix Electronics and suitable for high-voltage reference design, telecom surge protection, and aerospace voltage monitoring requiring stable component supply across extended temperature and radiation environments.

Supply support for 1N5276A 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 1N52xx series was designed specifically for ruggedized voltage regulation in mission-critical systems - emphasizing wide temperature operation, hermetic packaging, and MIL-PRF-19500 compliance from the outset.

FAQ

What is the Zener voltage tolerance of the 1N5276A?

The 1N5276A has a nominal Zener voltage of 150 V with a guaranteed tolerance of ±10%, as confirmed by Microsemi's official datasheet revision D. This tolerance applies under standard test conditions (IZT = 0.85 mA, TA = 25°C) and is validated per JEDEC registration for the 1N52xx series. The "A" suffix explicitly denotes the ±10% grade, distinguishing it from "B" (±5%), "C" (±2%), and "D" (±1%) variants of the same 1N5276 base number.

What is the maximum power dissipation for the 1N5276A at room temperature?

The 1N5276A is rated for 500 mW steady-state power dissipation at a lead temperature (TL) below 50°C with 3/8″ (10 mm) lead length from the glass body. When mounted on an FR4 PCB with 1 oz copper, its derated power drops to 480 mW at TA < 25°C due to higher thermal resistance (310°C/W junction-to-ambient). Derating curves in Figure 1 of the datasheet define linear reduction above these thresholds.

Does the 1N5276A have a specified temperature coefficient?

Yes, the 1N5276A has a temperature coefficient (αVZ) of +0.110 %/°C, measured between 25°C and 125°C at rated IZT. This value is consistent across the 1N5271–1N5281 family and reflects the positive drift characteristic typical of high-voltage Zeners. It means the 1N5276A's Zener voltage increases by approximately 165 mV per °C rise in junction temperature.

Is the 1N5276A suitable for surface-mount designs?

No - the 1N5276A is exclusively offered in the through-hole DO-35 (DO-204AH) glass axial-leaded package. For surface-mount equivalents, Microsemi lists the MLL5276 series in DO-213AA (MELF) package; however, that variant is not functionally identical to the 1N5276A and requires separate validation for thermal, mechanical, and electrical compatibility.

What is the reverse leakage current specification for the 1N5276A?

The 1N5276A specifies a maximum reverse current (IR) of 10 μA at VR = 114 V, as shown in the Electrical Characteristics table. This parameter is critical for low-power standby circuits, ensuring minimal quiescent current draw when the device is held below its 150 V Zener threshold. The value is guaranteed for all units meeting the "A" suffix screening level.