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

Microchip Technology 1N5271B

Name: 1N5271B
Brand: Microchip Technology
SKU: 1N5271B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5271B

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

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

Datasheet:: 1N5271B.pdf

Description:: DIODE ZENER 100V 500MW DO204AH

Quantity:: RFQ Add To RFQ list

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Inventory:7,658

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Product details

Overview

1N5271B from Microsemi is a 100 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 1.3 mA test current and 500 Ω dynamic impedance at 0.25 mA, operating from −65 °C to +175 °C. It provides precision voltage regulation in low-power reference and protection circuits.

For engineers reviewing the 1N5271B datasheet, 1N5271B pinout, 1N5271B application, or 1N5271B equivalent, this page delivers verified electrical specs, thermal derating behavior, Zener voltage temperature coefficient (+0.110 %/°C), DO-35 mechanical dimensions, and direct alternatives with documented tolerance and impedance differences.

Technical Context

The 1N5271B operates as a reverse-biased voltage reference with sharp breakdown knee, validated by dual-point Zener impedance measurement per MicroNote 202. Its 100 V nominal Zener voltage is specified at I_ZT = 1.3 mA, with guaranteed limits on V_Z, I_R, and V_F per JEDEC registration.

Thermal design requires junction-to-lead resistance of 250 °C/W at 3/8″ lead length, and junction-to-ambient resistance of 310 °C/W on FR4 with defined copper pad geometry. Forward voltage is capped at 1.5 V @ 200 mA, and ESD immunity is confirmed per MIL-STD-750 Method 1020.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	100 V @ I_ZT = 1.3 mA - defines stable regulation point under standard test conditions
Zener Tolerance	±5% (B suffix) - ensures output voltage remains within 95–105 V across production lot
Power Dissipation	500 mW at 25 °C - maximum steady-state power before thermal derating begins
Zener Impedance	500 Ω @ I_ZK = 0.25 mA - indicates regulation stability at low bias currents
Temp. Coefficient αV_Z	+0.110 %/°C - quantifies voltage drift over temperature; critical for high-temp reference designs
Max Reverse Current	10 μA @ V_R = 76 V - confirms leakage performance below regulation threshold
Operating Temp Range	−65 °C to +175 °C - supports aerospace, downhole, and industrial environments

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
Anode	Non-banded end	Connected to circuit ground or lower potential node during Zener operation
Cathode	Banded end	Connected to regulated voltage node; must be held positive relative to anode for breakdown conduction

Key Features

Feature	Design Value
JEDEC-registered Zener	Guaranteed V_Z, I_R, and V_F limits per 1N5271B B-suffix specification
Radiation hardness	Inherently radiation-hard per MicroNote 050 - suitable for space-grade analog references
Low capacitance	Typical C_J < 2 pF (per Figure 2) - minimizes signal coupling in RF bias networks
Military screening options	Available with MQ/MX/MV/MSP prefixes + "-1" suffix for JAN/JANTX/JANTXV/JANS compliance
ESD robustness	Nonsensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling

Applications

High-Voltage Reference Supply	Overvoltage Clamp for Sensor Interface
Use Scenario: Generating a stable 100 V reference for ADC biasing in industrial data acquisition systems operating up to 175 °C. IC Role / Device Role / Timing Role: Zener diode acting as passive voltage reference source with minimal current draw. Use Value: Delivers ±5% accuracy and +0.110 %/°C TC over full temperature range, enabling calibration-free operation in harsh environments.	Use Scenario: Protecting 100 V-rated op-amp inputs from transient surges in motor drive feedback circuits. IC Role / Device Role / Timing Role: Shunt clamp limiting input voltage to 100 V ±5% during fault events. Use Value: 500 mW power rating sustains short-duration transients without degradation; DO-35 axial leads allow through-hole mounting near sensitive nodes.
Low-Power Voltage Monitor	Aerospace Power Sequencing
Use Scenario: Detecting undervoltage conditions in 100 V DC bus monitoring for battery management systems. IC Role / Device Role / Timing Role: Zener-based comparator reference in discrete UVLO circuit. Use Value: Tight 5% tolerance and −65 °C to +175 °C operation ensure reliable trip point across mission-critical thermal profiles.	Use Scenario: Providing regulated 100 V startup reference for sequenced power rails in satellite payload controllers. IC Role / Device Role / Timing Role: Radiation-hardened Zener reference enabling deterministic power-up timing. Use Value: Inherent radiation hardness per MicroNote 050 and MIL-PRF-19500 screening options support Class S reliability requirements.

High-Voltage Reference Supply

Overvoltage Clamp for Sensor Interface

Use Scenario: Generating a stable 100 V reference for ADC biasing in industrial data acquisition systems operating up to 175 °C.

IC Role / Device Role / Timing Role: Zener diode acting as passive voltage reference source with minimal current draw.

Use Value: Delivers ±5% accuracy and +0.110 %/°C TC over full temperature range, enabling calibration-free operation in harsh environments.

Use Scenario: Protecting 100 V-rated op-amp inputs from transient surges in motor drive feedback circuits.

IC Role / Device Role / Timing Role: Shunt clamp limiting input voltage to 100 V ±5% during fault events.

Use Value: 500 mW power rating sustains short-duration transients without degradation; DO-35 axial leads allow through-hole mounting near sensitive nodes.

Low-Power Voltage Monitor

Aerospace Power Sequencing

Use Scenario: Detecting undervoltage conditions in 100 V DC bus monitoring for battery management systems.

IC Role / Device Role / Timing Role: Zener-based comparator reference in discrete UVLO circuit.

Use Value: Tight 5% tolerance and −65 °C to +175 °C operation ensure reliable trip point across mission-critical thermal profiles.

Use Scenario: Providing regulated 100 V startup reference for sequenced power rails in satellite payload controllers.

IC Role / Device Role / Timing Role: Radiation-hardened Zener reference enabling deterministic power-up timing.

Use Value: Inherent radiation hardness per MicroNote 050 and MIL-PRF-19500 screening options support Class S reliability requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5271A	±10% tolerance (vs. ±5% for 1N5271B); identical V_Z, I_ZT, and package	Lower accuracy required; acceptable where 90–110 V regulation window suffices	Select 1N5271A when cost sensitivity outweighs tight voltage tolerance needs
MMBZ5271B	SOT-23 surface-mount package; same 100 V ±5%, but 225 mW P_D and higher Z_ZT (750 Ω)	PCB space-constrained designs requiring reflow assembly instead of axial through-hole	Choose MMBZ5271B only if board layout mandates SMT and thermal budget allows reduced power dissipation

Compared with 1N5271A and MMBZ5271B, the 1N5271B uniquely balances ±5% tolerance, 500 mW capability, and DO-35 ruggedness-making it optimal for high-reliability through-hole voltage references where thermal margin and long-term stability are prioritized over footprint size or lowest cost.

Availability

1N5271B is available at Aetrix Electronics and suitable for high-voltage reference supplies, overvoltage clamps, low-power voltage monitors, and aerospace power sequencing requiring stable component supply across extended temperature and radiation environments.

Supply support for 1N5271B 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 1N52xxB series was designed specifically for precision voltage regulation in mission-critical systems demanding wide temperature operation, JEDEC-standardized performance, and proven reliability under extreme environmental stress.

FAQ

What is the Zener voltage tolerance of the 1N5271B?

The 1N5271B has a nominal Zener voltage of 100 V with a guaranteed tolerance of ±5%, as indicated by the "B" suffix per Microsemi's datasheet. This means the actual measured V_Z at I_ZT = 1.3 mA falls between 95 V and 105 V across all units, ensuring predictable regulation in production designs.

What is the maximum power dissipation for the 1N5271B at 25 °C?

The 1N5271B is rated for 500 mW power dissipation at 25 °C ambient or lead temperature, with linear derating above that temperature per Figure 1 in the datasheet. At 3/8″ lead length, thermal resistance is 250 °C/W junction-to-lead, meaning power must be reduced by 2 mW per °C rise above 25 °C to maintain safe junction temperature.

Does the 1N5271B have radiation hardness certification?

Yes-the 1N5271B is inherently radiation-hard per MicroNote 050, and military-screened versions (e.g., JANTXV-1N5271B with "MV" prefix and "-1" suffix) are qualified per MIL-PRF-19500. This makes the 1N5271B suitable for space and nuclear instrumentation applications where total ionizing dose (TID) resilience is required.

What is the Zener impedance of the 1N5271B and why does it matter?

The 1N5271B has a Zener impedance of 500 Ω measured at I_ZK = 0.25 mA. This value reflects how tightly the device maintains its 100 V regulation under small-signal AC variations-lower impedance yields better line and load regulation. It is critical for low-noise reference designs where ripple rejection matters.

Can the 1N5271B be used in surface-mount designs?

No-the 1N5271B is exclusively packaged in the axial-leaded DO-35 (DO-204AH) glass case. For surface-mount equivalents, Microsemi offers the MMBZ5271B in SOT-23, though it has lower power rating (225 mW) and higher Zener impedance (750 Ω). Direct substitution requires PCB redesign and thermal reassessment.

1N5271B 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):: 100 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 500 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 76 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)

1N5271B FAQ

1.How can I place an order for 1N5271B through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5271B 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 1N5271B reliable?

The price and inventory of 1N5271B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5271B is usually 5 days.

3.What payment methods are accepted for 1N5271B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5271B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5271B?

1N5271B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5271B 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 1N5271B?

For technical support, including 1N5271B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5271B requirements.

6.How does Aetrix verify that 1N5271B is sourced from the original manufacturer or authorized distributors?

All 1N5271B 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 1N5271B meets industry standards.

7.What is the process for return or replacement of 1N5271B?

All 1N5271B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5271B, 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 1N5271B part is unused and in its original packaging.

Return procedure for 1N5271B:

1.Submit a request within 90 days.

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

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