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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Microchip Technology 1N5270A

Name: 1N5270A
Brand: Microchip Technology
SKU: 1N5270A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5270A

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-204AH, DO-35, Axial

Datasheet:: 1N5270A.pdf

Description:: DIODE ZENER 91V 500MW DO204AH

Quantity:: RFQ Add To RFQ list

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Inventory:3,747

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Product details

Overview

1N5270A from Microsemi is a 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 91 V nominal Zener voltage at 1.4 mA test current, with ±10% tolerance, 2300 Ω maximum Zener impedance at IZK = 0.25 mA, and temperature coefficient of +0.099 %/°C - used for precision voltage reference and overvoltage protection in industrial power supplies.

For engineers reviewing the 1N5270A datasheet, 1N5270A pinout, 1N5270A application, or 1N5270A equivalent, key selection criteria include Zener voltage stability across temperature, low leakage (<0.1 μA at 73 V), thermal resistance (250 °C/W junction-to-lead), and compatibility with through-hole PCB assembly under MIL-PRF-19500 screening options.

Technical Context

This discrete Zener diode operates in reverse breakdown to maintain stable voltage regulation across wide current (0.25–1.4 mA) and temperature (−65 °C to +175 °C) ranges. Its DO-35 glass package provides hermetic sealing and inherent radiation hardness per MicroNote 050.

It exhibits minimal capacitance (typical <2 pF at 0 V), nonsensitive ESD behavior (MIL-STD-750 Method 1020), and forward voltage ≤1.5 V at 200 mA - enabling use in low-noise analog references and transient suppression where parasitic effects must be minimized.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage (V_Z)	91 V at 1.4 mA test current - defines regulated output voltage under standard bias conditions
Zener Tolerance	±10% (A suffix) - sets worst-case voltage deviation for design margining in feedback loops
Maximum Zener Impedance (Z_ZT)	2300 Ω at I_ZK = 0.25 mA - determines dynamic voltage variation under load transients
Max Reverse Current (I_R)	0.1 μA at 73 V - ensures negligible leakage in high-impedance reference circuits
Power Dissipation	500 mW at 25 °C - limits continuous operating current to ~5.5 mA at 91 V
Temperature Coefficient (αV_Z)	+0.099 %/°C - quantifies voltage drift magnitude over industrial temperature range
Operating Temperature Range	−65 °C to +175 °C - supports deployment in aerospace, downhole, and automotive under-hood environments

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.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Reverse-biased terminal during Zener operation	Connected to lower-potential node; accepts full reverse current during regulation
Cathode	Zener voltage reference terminal	Banded end; held at stable 91 V above anode when biased correctly

Key Features

Feature	Design Value
JEDEC-registered Zener series	Ensures standardized electrical behavior and interchangeability across qualified suppliers
Hermetic glass DO-35 package	Provides long-term reliability and moisture resistance without conformal coating
Inherent radiation hardness	Validated per MicroNote 050 - suitable for space-qualified and nuclear instrumentation applications
Nonsensitive to ESD	Withstands >4 kV HBM per MIL-STD-750 Method 1020 - reduces handling precautions in production
Minimal junction capacitance	Typical <2 pF (Figure 2) - preserves signal integrity in RF bias and fast-switching regulator feedback paths

Applications

Industrial Power Supply Reference	Aerospace Voltage Clamp
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter secondary-side error amplifiers. IC Role / Device Role / Timing Role: Precision voltage reference establishing 91 V setpoint for optocoupler-driven regulation loop. Use Value: ±10% tolerance and +0.099 %/°C TC enable stable output within ±2.5% over −40 °C to +85 °C ambient.	Use Scenario: Protecting avionics sensor inputs against induced transients on 28 V aircraft buses. IC Role / Device Role / Timing Role: Overvoltage clamp limiting input to 91 V during lightning-induced surges. Use Value: 500 mW rating and −65 °C to +175 °C range ensure survivability in uncontrolled environmental bays.
Downhole Instrumentation Bias	Test Equipment Calibration Standard
Use Scenario: Providing stable bias for piezoresistive pressure transducers in oil/gas well logging tools. IC Role / Device Role / Timing Role: Low-drift Zener reference supplying excitation voltage to Wheatstone bridge sensors. Use Value: Hermetic DO-35 package and radiation hardness prevent parameter shift under gamma exposure and high-temperature downhole conditions.	Use Scenario: Serving as traceable voltage standard in benchtop multimeter calibration fixtures. IC Role / Device Role / Timing Role: Primary 91 V reference source for automated calibration sequence verification. Use Value: Guaranteed V_Z, I_R, and V_F limits (JEDEC Type No.) support NIST-traceable uncertainty budgets.

Industrial Power Supply Reference

Aerospace Voltage Clamp

Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter secondary-side error amplifiers.

IC Role / Device Role / Timing Role: Precision voltage reference establishing 91 V setpoint for optocoupler-driven regulation loop.

Use Value: ±10% tolerance and +0.099 %/°C TC enable stable output within ±2.5% over −40 °C to +85 °C ambient.

Use Scenario: Protecting avionics sensor inputs against induced transients on 28 V aircraft buses.

IC Role / Device Role / Timing Role: Overvoltage clamp limiting input to 91 V during lightning-induced surges.

Use Value: 500 mW rating and −65 °C to +175 °C range ensure survivability in uncontrolled environmental bays.

Downhole Instrumentation Bias

Test Equipment Calibration Standard

Use Scenario: Providing stable bias for piezoresistive pressure transducers in oil/gas well logging tools.

IC Role / Device Role / Timing Role: Low-drift Zener reference supplying excitation voltage to Wheatstone bridge sensors.

Use Value: Hermetic DO-35 package and radiation hardness prevent parameter shift under gamma exposure and high-temperature downhole conditions.

Use Scenario: Serving as traceable voltage standard in benchtop multimeter calibration fixtures.

IC Role / Device Role / Timing Role: Primary 91 V reference source for automated calibration sequence verification.

Use Value: Guaranteed V_Z, I_R, and V_F limits (JEDEC Type No.) support NIST-traceable uncertainty budgets.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5270B	±5% tolerance (vs. ±10% for 1N5270A); same V_Z, I_ZT, Z_ZT, and package	Higher accuracy required in closed-loop feedback where tighter regulation margin is critical	Select 1N5270B when system-level voltage error budget demands <±0.5 V deviation at 91 V
MMBZ5270AL	Surface-mount SOD-123 package; same 91 V/±10%; 250 mW rating (half power)	Space-constrained PCBs where axial-leaded DO-35 footprint is incompatible with layout	Choose MMBZ5270AL only if thermal derating and reduced power capability (250 mW) are acceptable

Compared with 1N5270B and MMBZ5270AL, the 1N5270A offers optimal balance of cost, legacy compatibility, and sufficient accuracy for non-critical industrial references - while retaining full DO-35 mechanical robustness and MIL-PRF-19500 screening path via prefix options.

Availability

1N5270A is available at Aetrix Electronics and suitable for industrial power supplies, aerospace clamping circuits, and downhole instrumentation requiring stable component supply with long-lifecycle support and traceable sourcing.

Supply support for 1N5270A 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 defense, aerospace, and industrial markets.

The 1N52xx series belongs to Microsemi's legacy Zener diode product line designed specifically for precision voltage regulation in harsh-environment applications demanding extended temperature range and hermetic packaging.

FAQ

What is the nominal Zener voltage and test current for the 1N5270A?

The 1N5270A has a nominal Zener voltage of 91 V measured at a test current (I_ZT) of 1.4 mA. This value is guaranteed per JEDEC specification and forms the basis for regulation performance in linear power supply feedback networks and voltage reference designs using the 1N5270A.

Does the 1N5270A meet RoHS requirements?

Yes, the 1N5270A is RoHS compliant when ordered with the "e3" suffix (e.g., 1N5270Ae3). The base 1N5270A uses tin-lead plating, but RoHS-compliant matte-tin plating is available per MIL-STD-750 Method 2026 - confirmed in Microsemi's official documentation for the 1N5221–1N5281B series.

What is the maximum reverse leakage current for the 1N5270A?

The 1N5270A specifies a maximum reverse current (I_R) of 0.1 μA at 73 V (80% of V_Z). This ultra-low leakage supports high-impedance reference applications such as sensor biasing and precision comparator thresholds where current draw must remain below 100 nA.

Can the 1N5270A be used in military-grade applications?

Yes, the 1N5270A can be screened to MIL-PRF-19500 levels (JAN, JANTX, JANTXV, JANS) by adding appropriate prefixes (MQ, MX, MV, MSP) and the "-1" suffix - e.g., MQ1N5270A-1. These versions undergo rigorous environmental and electrical testing per military standards, making them suitable for defense and space programs requiring certified reliability.

What is the thermal resistance of the 1N5270A and how does it affect power handling?

The 1N5270A has a thermal resistance of 250 °C/W junction-to-lead at 3/8″ (10 mm) lead length. At 25 °C ambient, this allows full 500 mW dissipation; above 50 °C lead temperature, power must be linearly derated - e.g., only ~300 mW at TL = 100 °C - directly impacting sustained current capability in enclosed or high-temperature enclosures.

1N5270A Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: DO-204AH, DO-35, Axial

Packaging:: Bulk

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 91 V

Tolerance:: ±10%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 400 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 69 V

Voltage - Forward (Vf) (Max) @ If:: 1.5 V @ 200 mA

Operating Temperature:: -65°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AH (DO-35)

1N5270A FAQ

1.How can I place an order for 1N5270A through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5270A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 1N5270A reliable?

The price and inventory of 1N5270A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5270A is usually 5 days.

3.What payment methods are accepted for 1N5270A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5270A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5270A?

1N5270A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5270A order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 1N5270A?

For technical support, including 1N5270A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5270A requirements.

6.How does Aetrix verify that 1N5270A is sourced from the original manufacturer or authorized distributors?

All 1N5270A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1N5270A meets industry standards.

7.What is the process for return or replacement of 1N5270A?

All 1N5270A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5270A, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 1N5270A part is unused and in its original packaging.

Return procedure for 1N5270A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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