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Microchip Technology 1N3043BUR-1/TR
- Part No.:
- 1N3043BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N3043BUR-1/TR.pdf
- Description:
- DIODE ZENER 91V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,189
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Product details
Overview
1N3043BUR-1 from Microsemi is a hermetically sealed, metallurgically bonded surface-mount Zener diode in DO-213AB (MELF/LL41) package, rated for 1 W DC power dissipation, with nominal Zener voltage of 91 V at 2.8 mA test current, dynamic impedance of 69.2 Ω at IZT, and maximum reverse leakage current of 10 µA at 73.7 V. It serves as a precision voltage reference and regulation element in high-reliability power supply and protection circuits.
For engineers reviewing the 1N3043BUR-1 datasheet, 1N3043BUR-1 pinout, 1N3043BUR-1 application, or 1N3043BUR-1 equivalent, key selection criteria include its ±5% voltage tolerance (B-grade), -55 °C to +175 °C junction temperature range, 50 °C/W junction-to-end-cap thermal resistance, RoHS-compliant commercial variants, and MIL-PRF-19500/115 qualification options (JAN/JANTX/JANTXV).
Technical Context
This device operates as a two-terminal voltage regulator in reverse-biased mode, with Zener breakdown engineered for stable regulation across 10 µA to 250 mA operating current range. Its glass MELF construction provides low parasitic capacitance and inherent radiation hardness per MicroNote 050, supporting operation in harsh thermal and radiation environments.
The 1N3043BUR-1 exhibits a positive temperature coefficient of +0.108 %/°C for Zener voltage, indicating voltage increases with temperature - critical for thermal drift compensation in reference designs. Its metallurgically enhanced internal contact reduces thermal resistance and improves long-term reliability versus standard axial-leaded equivalents.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 91 V at 2.8 mA test current - defines primary regulation point under standard bias conditions |
| Power Dissipation (PD) | 1.0 W - maximum continuous DC power handling at TEC ≤ 125 °C, derating linearly to zero at 175 °C |
| Dynamic Impedance (ZZT) | 69.2 Ω at IZT - determines AC regulation stability and output ripple rejection capability |
| Reverse Leakage Current (IR) | 10 µA at 73.7 V - ensures minimal standby power loss and high off-state impedance in clamping applications |
| Junction Temperature Range | -55 °C to +175 °C - enables deployment in extended industrial, aerospace, and downhole environments |
| Thermal Resistance (RθJEC) | 50 °C/W - quantifies thermal path efficiency from junction to end cap, critical for thermal design margining |
| Package Outline | DO-213AB (MELF/LL41) - leadless cylindrical surface-mount form factor enabling high-density PCB layout and low parasitics |
Pinout & Package
DO-213AB (MELF) glass package: hermetically sealed, cylindrical body with cathode band marking; terminals are metallurgically bonded copper-clad steel ends, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Positive terminal during Zener regulation | Must be biased positive relative to anode to operate in breakdown region; polarity marking is critical for correct orientation on PCB |
| Anode (unbanded end) | Negative terminal during Zener regulation | Serves as reference ground node in shunt regulator configurations; connects to system ground or lower-potential rail |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and long-term parameter drift; supports >20-year field life in sealed enclosures |
| Metallurgically bonded internal contacts | Reduces interfacial thermal resistance by ~30% vs. solder-bonded alternatives, improving power cycling endurance |
| ±5% Zener voltage tolerance (B-grade) | Enables cost-effective precision regulation without trimming; suitable for non-critical reference and clamp functions |
| MIL-PRF-19500/115 qualification (JAN/JANTX/JANTXV) | Validated screening and testing for military/aerospace use including burn-in, temperature cycling, and lot acceptance |
| Inherent radiation hardness | Meets total ionizing dose (TID) requirements per MicroNote 050 - no additional shielding needed in space-qualified systems |
Applications
| High-Voltage Power Supply Regulation | Aerospace DC-DC Converter Reference |
|---|---|
|
Use Scenario: Stabilizing 90–100 V intermediate bus in isolated flyback converters for avionics power modules. IC Role / Device Role / Timing Role: Shunt voltage reference and overvoltage clamp protecting secondary-side controller ICs. Use Value: Maintains regulation within ±5% across -55 °C to +125 °C ambient, leveraging 91 V nominal VZ and low αVZ drift. |
Use Scenario: Providing stable feedback reference for radiation-hardened DC-DC controllers in satellite power distribution units. IC Role / Device Role / Timing Role: Precision Zener reference replacing adjustable TL431-based networks where component count and failure modes must be minimized. Use Value: Eliminates external resistive divider and op-amp, reducing BOM count and single-point failure risk while meeting TID >100 krad(Si). |
| Industrial Motor Drive Overvoltage Protection | Downhole Oilfield Sensor Biasing |
|
Use Scenario: Clamping transient spikes on 72 V DC link in variable-frequency drives during IGBT switching events. IC Role / Device Role / Timing Role: Fast-response overvoltage suppressor placed directly across bus capacitors. Use Value: Withstands 250 mA peak Zener current and 10 µA leakage at 73.7 V, ensuring low standby loss and robust surge absorption. |
Use Scenario: Generating stable 91 V bias for piezoelectric transducers in high-temperature (>150 °C) wellbore logging tools. IC Role / Device Role / Timing Role: High-temperature-stable voltage source for sensor excitation and signal conditioning front-ends. Use Value: Operates continuously at +175 °C junction temperature with verified parametric stability per MIL-PRF-19500/115 JANTXV screening. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N3043UR-1 (Microchip) | Same nominal VZ (91 V), but DO-41 axial package; lacks MIL-PRF-19500 qualification and hermetic MELF seal | Lower-cost alternative for commercial-grade, non-high-density PCBs where axial mounting is acceptable | Select when board space and reliability requirements permit non-surface-mount, non-hermetic construction |
| BZX85C91 (ON Semiconductor) | 91 V Zener, ±5%, TO-204AA (DO-41); 1.3 W rating; higher leakage (50 µA @ 73 V); not radiation-hardened | General-purpose commercial regulation where radiation tolerance and extreme temperature range are not required | Choose for cost-sensitive consumer or industrial applications with <125 °C max ambient and no radiation exposure |
Compared with 1N3043BUR-1, the 1N3043UR-1 offers identical electrical specs but sacrifices surface-mount compatibility and hermetic reliability, while the BZX85C91 trades radiation hardness and thermal range for higher power rating and broader commercial availability - making the 1N3043BUR-1 optimal for mission-critical, high-temperature, or radiation-prone deployments.
Availability
1N3043BUR-1 is available at Aetrix Electronics and suitable for high-reliability power supply regulation, aerospace DC-DC converter reference, and downhole oilfield sensor biasing requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N3043BUR-1 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 1N3043BUR-1 belongs to Microsemi's legacy MIL-PRF-19500-qualified Zener diode family, designed specifically for high-density, high-reliability voltage regulation in mission-critical systems where hermeticity, thermal stability, and radiation tolerance are mandatory.
FAQ
What is the Zener voltage tolerance for 1N3043BUR-1?
The 1N3043BUR-1 has a nominal Zener voltage of 91 V with a ±5% tolerance (denoted by the "B" in the part nomenclature), meaning its actual VZ falls between 86.45 V and 95.55 V at 2.8 mA test current and 25 °C. This tolerance is verified per MIL-PRF-19500/115 screening and applies across the full qualified temperature range.
Is 1N3043BUR-1 suitable for surface-mount assembly using standard reflow profiles?
Yes, the 1N3043BUR-1 is qualified for surface-mount assembly with a maximum solder temperature of 260 °C for 10 seconds, compliant with IPC-J-STD-020. Its DO-213AB (MELF) package and matte-tin or tin/lead terminations meet MIL-STD-750 Method 2026 solderability requirements, supporting automated pick-and-place and reflow processes.
Does 1N3043BUR-1 have radiation hardness certification?
Yes, the 1N3043BUR-1 exhibits inherent radiation hardness as documented in Microsemi MicroNote 050. While not individually certified per MIL-STD-883, its hermetic glass MELF construction and metallurgical bonding provide proven resilience to total ionizing dose (TID) up to 100 krad(Si), making it suitable for low-earth orbit and nuclear instrumentation applications.
What is the maximum reverse leakage current specification for 1N3043BUR-1?
The 1N3043BUR-1 specifies a maximum reverse leakage current (IR) of 10 µA at 73.7 V (81% of nominal VZ) and 25 °C. This low leakage ensures minimal power loss in standby mode and high impedance in clamping configurations, contributing to system-level energy efficiency and noise immunity.
Can 1N3043BUR-1 be used in place of axial-leaded 1N3043B-1?
No - the 1N3043BUR-1 is a surface-mount DO-213AB (MELF) variant, while the 1N3043B-1 uses the DO-41 axial package. Though electrically equivalent in VZ, tolerance, and power rating, their mechanical form factors, thermal paths, and mounting methods differ fundamentally; PCB redesign and thermal validation are required for substitution.
1N3043BUR-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):
- 91 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 250 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 69.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AB (MELF, LL41)
1N3043BUR-1/TR FAQ
1.How can I place an order for 1N3043BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3043BUR-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 1N3043BUR-1/TR reliable?
The price and inventory of 1N3043BUR-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 1N3043BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N3043BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3043BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3043BUR-1/TR?
1N3043BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3043BUR-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 1N3043BUR-1/TR?
For technical support, including 1N3043BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3043BUR-1/TR requirements.
6.How does Aetrix verify that 1N3043BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N3043BUR-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 1N3043BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N3043BUR-1/TR?
All 1N3043BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N3043BUR-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 1N3043BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N3043BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N3043BUR-1/TR Tags
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