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

Microchip Technology 1N5917BUR-1/TR

Name: 1N5917BUR-1/TR
Brand: Microchip Technology
SKU: 1N5917BUR-1/TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5917BUR-1/TR

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-213AB, MELF (Glass)

Datasheet:: 1N5917BUR-1/TR.pdf

Description:: DIODE ZENER 4.7V 1.25W DO213AB

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Product details

Overview

1N5917BUR-1/TR from Microsemi is a 1.5 W surface-mount Zener diode in DO-213AB (MELF) glass package, rated for 4.7 V ±5% Zener voltage at 79.8 mA test current, with 5.0 Ω dynamic impedance and 5.0 µA reverse leakage at 3.76 V. It delivers stable voltage regulation in high-density power supply rails and precision reference circuits.

For engineers reviewing the 1N5917BUR-1/TR datasheet, 1N5917BUR-1/TR pinout, 1N5917BUR-1/TR application, or 1N5917BUR-1/TR equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (R_θJA = 120 °C/W), hermetic glass packaging, MIL-PRF-19500 screening capability, and RoHS-compliant plating.

Technical Context

This device operates as a two-terminal voltage regulator in reverse-bias breakdown mode, with specified knee current (I_ZK = 1.0 mA) and knee impedance (Z_ZK = 500 Ω), enabling stable regulation across wide current ranges (I_ZM = 319 mA max). Its metallurgically bonded tungsten slug construction ensures low thermal resistance (R_θJEC = 40 °C/W) and enhanced reliability under thermal cycling.

The DO-213AB MELF package provides hermetic glass sealing, non-ESD-sensitive behavior per MIL-STD-750 Method 1020, and inherent radiation hardness per MicroNote 050. Capacitance is characterized per Figure 2 and varies with Zener voltage - for 1N5917BUR-1/TR, typical C ≈ 1000 pF at 1 MHz.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	4.7 V ±5% at I_ZT = 79.8 mA - defines nominal regulation point with tight tolerance for precision references.
Power Dissipation (P_D)	1.5 W @ T_EC ≤ 115 °C - supports continuous operation in compact layouts with adequate end-cap heatsinking.
Dynamic Impedance (Z_ZT)	5.0 Ω - ensures minimal output voltage variation under load transients in feedback or shunt regulator designs.
Reverse Leakage (I_R)	5.0 µA @ V_R = 3.76 V - guarantees low quiescent current in battery-powered or low-power standby circuits.
Thermal Resistance (R_θJA)	120 °C/W on FR4 (1 oz Cu) - informs PCB thermal design requirements for sustained 1.25 W operation at 25 °C ambient.
Junction Temperature Range	–65 to +175 °C - enables deployment in extended industrial, aerospace, and downhole environments.

Pinout & Package

DO-213AB (MELF) glass package: hermetically sealed cylindrical body with metallurgically bonded tungsten slugs; cathode indicated by single black band; leadless, symmetric terminals; weight ≈ 0.05 g; dimensions BD = 2.39–2.67 mm, BL = 4.80–5.21 mm.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Positive terminal in forward bias; negative terminal during Zener regulation	Connected to lower-potential node in shunt regulator configuration; requires current-limiting resistor upstream.
Cathode	Negative terminal in forward bias; positive terminal during Zener regulation	Banded end - must be held at higher potential than anode to activate breakdown; serves as regulated output reference node.

Key Features

Feature	Design Value
Hermetic glass MELF construction	Eliminates moisture ingress and long-term parameter drift; qualified for high-reliability applications per MIL-PRF-19500 screening.
Metallurgically enhanced internal contacts	Reduces interfacial thermal resistance and improves power cycling endurance vs. standard wire-bonded Zeners.
RoHS-compliant matte tin plating	Enables lead-free reflow assembly (260 °C/10 s) without solderability degradation or whisker risk.
Non-ESD-sensitive design	Withstands handling per MIL-STD-750 Method 1020 without preconditioning - simplifies manufacturing ESD controls.

Applications

Industrial Power Supply Reference	Aerospace Voltage Clamp
Use Scenario: Stabilizing feedback node in isolated DC-DC converter secondary-side error amplifiers. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 4.7 V setpoint for optocoupler-driven regulation loop. Use Value: Tight 5% V_Z tolerance and low Z_ZT maintain <±1% output accuracy across line/load/temperature variations.	Use Scenario: Overvoltage protection on 5 V avionics bus lines subject to lightning-induced transients. IC Role / Device Role / Timing Role: Fast-acting clamp limiting transient excursions to ≤5.2 V peak during 10/700 µs surge events. Use Value: Hermetic glass package withstands harsh environmental stressors while maintaining regulation integrity after repeated surges.
Test Equipment Calibration Standard	Downhole Sensor Bias Network
Use Scenario: Generating traceable 4.7 V reference in portable multimeter front-end ADC biasing circuitry. IC Role / Device Role / Timing Role: Precision shunt regulator supplying stable bias to op-amp input stages and reference dividers. Use Value: Low 5.0 µA I_R minimizes loading error on high-impedance divider networks; –65 to +175 °C range supports calibration across temperature chambers.	Use Scenario: Providing regulated bias voltage to piezoresistive pressure sensors in oil/gas wellhead electronics. IC Role / Device Role / Timing Role: High-temperature-stable Zener establishing sensor excitation voltage in 150 °C ambient environments. Use Value: Metallurgically bonded construction prevents contact degradation at elevated temperatures; R_θJEC = 40 °C/W enables direct end-cap thermal coupling to heat-sinked housing.

Industrial Power Supply Reference

Aerospace Voltage Clamp

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

IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 4.7 V setpoint for optocoupler-driven regulation loop.

Use Value: Tight 5% V_Z tolerance and low Z_ZT maintain <±1% output accuracy across line/load/temperature variations.

Use Scenario: Overvoltage protection on 5 V avionics bus lines subject to lightning-induced transients.

IC Role / Device Role / Timing Role: Fast-acting clamp limiting transient excursions to ≤5.2 V peak during 10/700 µs surge events.

Use Value: Hermetic glass package withstands harsh environmental stressors while maintaining regulation integrity after repeated surges.

Test Equipment Calibration Standard

Downhole Sensor Bias Network

Use Scenario: Generating traceable 4.7 V reference in portable multimeter front-end ADC biasing circuitry.

IC Role / Device Role / Timing Role: Precision shunt regulator supplying stable bias to op-amp input stages and reference dividers.

Use Value: Low 5.0 µA I_R minimizes loading error on high-impedance divider networks; –65 to +175 °C range supports calibration across temperature chambers.

Use Scenario: Providing regulated bias voltage to piezoresistive pressure sensors in oil/gas wellhead electronics.

IC Role / Device Role / Timing Role: High-temperature-stable Zener establishing sensor excitation voltage in 150 °C ambient environments.

Use Value: Metallurgically bonded construction prevents contact degradation at elevated temperatures; R_θJEC = 40 °C/W enables direct end-cap thermal coupling to heat-sinked housing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5917B-TR	Same electrical specs but non-RoHS (SnPb plating); DO-213AB package; no "UR" reliability suffix.	Limited to legacy military/aerospace builds requiring SnPb assembly; not compliant with modern RoHS directives.	Select only if SnPb reflow is mandated and RoHS exemption applies.
SMBG5917B-T	Same V_Z and I_ZT, but SMB package (higher R_θJA = 150 °C/W); 1.5 W rating derated faster above 75 °C ambient.	Preferred for board space-constrained designs where MELF placement is impractical; less suitable for high-temp or high-reliability use.	Choose when footprint compatibility with tabbed SMT packages outweighs hermeticity and thermal performance needs.

Compared with 1N5917BUR-1/TR, 1N5917B-TR lacks RoHS compliance and reliability screening, while SMBG5917B-T trades hermetic sealing and thermal efficiency for easier pick-and-place assembly - making the original optimal for high-reliability, high-temperature, or radiation-tolerant deployments.

Availability

1N5917BUR-1/TR is available at Aetrix Electronics and suitable for industrial power supplies, aerospace clamping circuits, test equipment calibration standards, and downhole sensor bias networks requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for 1N5917BUR-1/TR 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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and radiation-hardened components for defense, aerospace, and industrial markets.

The 1N59xxBUR-1 series belongs to Microsemi's precision Zener diode product line, engineered for applications demanding hermeticity, MIL-PRF-19500 qualification, and stable voltage regulation under extreme thermal and radiation environments.

FAQ

What is the Zener voltage tolerance and test condition for 1N5917BUR-1/TR?

The 1N5917BUR-1/TR has a Zener voltage of 4.7 V with ±5% tolerance, measured at a test current (I_ZT) of 79.8 mA and end-cap temperature (T_EC) maintained at 30 °C. Voltage is recorded 90 seconds after dc current application to ensure thermal stabilization, per Microsemi T4-LDS-0300-1 specification.

Is 1N5917BUR-1/TR compatible with lead-free reflow processes?

Yes, the 1N5917BUR-1/TR features RoHS-compliant matte tin plating and is qualified for lead-free reflow soldering at 260 °C for 10 seconds per MIL-STD-750 Method 2026. Its glass MELF body remains structurally stable under these conditions, with no delamination or plating degradation observed.

Does 1N5917BUR-1/TR require external current limiting in circuit design?

Yes, the 1N5917BUR-1/TR must be used with a series current-limiting resistor to restrict operating current within its 319 mA maximum Zener current (I_ZM) and prevent thermal runaway. The resistor value is calculated based on input voltage, desired load current, and the 4.7 V regulation target - typical designs use 100–470 Ω for 12 V input rails.

Can 1N5917BUR-1/TR be used in radiation-intensive environments?

Yes, the 1N5917BUR-1/TR is inherently radiation-hardened as documented in Microsemi MicroNote 050. Its hermetic glass package and metallurgically bonded structure provide immunity to total ionizing dose (TID) effects up to 100 krad(Si), making it suitable for satellite power systems and nuclear instrumentation.

What is the meaning of the "UR-1" suffix in 1N5917BUR-1/TR?

The "UR" in 1N5917BUR-1/TR denotes Microsemi's Metallurgically Bonded Glass Surface Mount construction (DO-213AB), while "-1" indicates 5% Zener voltage tolerance. The "TR" suffix specifies EIA-481-B tape-and-reel packaging with 12 mm carrier tape - standard for automated SMT assembly at Aetrix Electronics.

1N5917BUR-1/TR Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: DO-213AB, MELF (Glass)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 4.7 V

Tolerance:: ±5%

Power - Max:: 1.25 W

Impedance (Max) (Zzt):: 5 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 1.5 V

Voltage - Forward (Vf) (Max) @ If:: 1.2 V @ 200 mA

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-213AB (MELF, LL41)

1N5917BUR-1/TR FAQ

1.How can I place an order for 1N5917BUR-1/TR through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5917BUR-1/TR 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 1N5917BUR-1/TR reliable?

The price and inventory of 1N5917BUR-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5917BUR-1/TR is usually 5 days.

3.What payment methods are accepted for 1N5917BUR-1/TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5917BUR-1/TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5917BUR-1/TR?

1N5917BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5917BUR-1/TR 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 1N5917BUR-1/TR?

For technical support, including 1N5917BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5917BUR-1/TR requirements.

6.How does Aetrix verify that 1N5917BUR-1/TR is sourced from the original manufacturer or authorized distributors?

All 1N5917BUR-1/TR 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 1N5917BUR-1/TR meets industry standards.

7.What is the process for return or replacement of 1N5917BUR-1/TR?

All 1N5917BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5917BUR-1/TR, 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 1N5917BUR-1/TR part is unused and in its original packaging.

Return procedure for 1N5917BUR-1/TR:

1.Submit a request within 90 days.

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

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