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Microchip Technology 1N3018BUR-1
- Part No.:
- 1N3018BUR-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF
- Datasheet:
-
1N3018BUR-1.pdf
- Description:
- DIODE ZENER 8.2V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,913
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Product details
Overview
1N3018BUR-1 from Microsemi is a surface-mount glass-hermetic Zener diode in DO-213AB (MELF) package, rated for 1.5 W power dissipation at 25°C, with nominal Zener voltage 8.2 V ±5%, 31 mA test current, 4.5 Ω dynamic impedance at IZT, and maximum reverse leakage of 0.5 μA at 6.2 V. It delivers stable voltage regulation in high-density power supply feedback loops and precision reference circuits.
For engineers reviewing the 1N3018BUR-1 datasheet, 1N3018BUR-1 pinout, 1N3018BUR-1 application, or 1N3018BUR-1 equivalent, key selection criteria include its 8.2 V regulation tolerance, low 4.5 Ω ZZT, hermetic glass construction for reliability, -65°C to +175°C operating range, and compatibility with RoHS-compliant reflow soldering per MIL-STD-750.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown to maintain a stable 8.2 V across its terminals over a wide current range (0.25 mA to 172.5 mA). Its metallurgically enhanced contact design reduces thermal resistance (40°C/W junction-to-end-cap), enabling reliable operation under sustained power stress.
The DO-213AB MELF package provides low parasitic capacitance (typical 2.5 pF at 4 V), tight voltage tolerance (±5% standard), and inherent radiation hardness per MicroNote 050 - critical for aerospace and industrial control applications requiring long-term parametric stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 8.2 V ±5% - defines precise regulation point for feedback networks and reference rails |
| Power Dissipation | 1.5 W at 25°C end-cap temperature - supports robust thermal margin in compact layouts |
| Zener Test Current | 31 mA - establishes stable operating point where VZ and ZZT are specified |
| Zener Impedance | 4.5 Ω at IZT - ensures minimal output voltage variation under load transients |
| Reverse Leakage | 0.5 μA at 6.2 V - guarantees low quiescent current in high-impedance bias/reference paths |
| Operating Temperature | -65°C to +175°C - enables deployment in extended-environment automotive, avionics, and downhole systems |
| Thermal Resistance | 40°C/W junction-to-end-cap - allows direct thermal coupling to heatsink or copper pour for sustained 1.5 W operation |
Pinout & Package
DO-213AB (MELF) glass package: cylindrical, leadless, hermetically sealed; cathode indicated by single black band; terminals are axial ends - no polarity-specific pins; mounting requires symmetric solder pads per Microsemi-recommended footprint (Page 3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower-potential node in Zener regulation configuration |
| Cathode (banded end) | Reverse breakdown terminal / Regulated output node | Provides stable 8.2 V relative to anode when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and long-term parameter drift - essential for 20+ year field life in sealed modules |
| Metallurgically enhanced contact | Reduces interfacial thermal resistance by >30% vs. standard glass diodes - improves power handling consistency |
| Low 4.5 Ω ZZT at 31 mA | Enables <±10 mV regulation shift across 10–100 mA load changes in feedback divider networks |
| Nonsensitive to ESD | Withstands >8 kV HBM without parameter shift - simplifies handling and eliminates need for on-board protection |
| RoHS-compliant (e3 suffix) | Meets IPC-J-STD-020D reflow profile (260°C/10 s) - compatible with lead-free manufacturing without derating |
Applications
| Industrial Power Supply Feedback | Aerospace Voltage Reference |
|---|---|
|
Use Scenario: Regulating output voltage in isolated DC-DC converters using optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener diode provides precise 8.2 V reference for TL431 shunt regulator input or optocoupler LED bias. Use Value: Tight ±5% tolerance and low 4.5 Ω impedance ensure <±0.5% output voltage accuracy across line/load/temperature. |
Use Scenario: Providing stable bias voltage for radiation-hardened op-amps in satellite telemetry conditioning circuits. IC Role / Device Role / Timing Role: Acts as primary voltage reference in analog signal chain where long-term drift must be <10 ppm/°C. Use Value: Hermetic glass seal and radiation-hardened structure per MicroNote 050 prevent parametric degradation in total ionizing dose environments. |
| Downhole Sensor Excitation | High-Temperature Motor Control |
|
Use Scenario: Supplying excitation voltage to piezoresistive pressure sensors in oil/gas wellhead monitoring systems. IC Role / Device Role / Timing Role: Zener regulates sensor bridge bias at 8.2 V despite ambient temperatures up to +175°C. Use Value: -65°C to +175°C operating range and 40°C/W junction-to-end-cap thermal resistance enable direct mounting to sensor housing without heatsink. |
Use Scenario: Stabilizing gate drive voltage references in IGBT-based motor inverters exposed to engine bay thermal cycling. IC Role / Device Role / Timing Role: Provides clamped reference for isolated gate driver ICs during transient overvoltage events. Use Value: Low 0.5 μA leakage at 6.2 V prevents false triggering; 1.5 W rating sustains surge energy absorption without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N3018B (DO-13) | Same electrical specs but axial-leaded DO-13 package; higher thermal resistance (120°C/W on FR4); no RoHS e3 option | Requires through-hole PCB layout; unsuitable for high-density SMT assemblies | Select only if legacy through-hole assembly or manual repair is required |
| MMBZ5231B (SOT-23) | Surface-mount but plastic-packaged; 500 mW rating; 6.2 V nominal; ±5% tolerance; 17 Ω ZZT | Limited to low-power logic-level references; not rated for >125°C or radiation environments | Choose only for cost-sensitive consumer applications below 100 mW and <125°C ambient |
Compared with 1N3018B and MMBZ5231B, the 1N3018BUR-1 uniquely combines 1.5 W power handling, hermetic MELF reliability, full military-temperature range, and RoHS compliance - making it the sole choice for high-reliability SMT voltage regulation where long-term stability and environmental resilience are mandatory.
Availability
1N3018BUR-1 is available at Aetrix Electronics and suitable for industrial power supplies, aerospace telemetry systems, downhole instrumentation, and high-temperature motor controls requiring stable component supply across extended product lifecycles.
Supply support for 1N3018BUR-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 (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 1N3018BUR-1 belongs to Microsemi's legacy glass Zener diode family designed specifically for mission-critical voltage regulation where hermetic sealing, wide temperature operation, and parametric stability outweigh cost-driven trade-offs.
FAQ
What is the Zener voltage tolerance for 1N3018BUR-1?
The 1N3018BUR-1 has a nominal Zener voltage of 8.2 V with a standard tolerance of ±5%, indicated by the "B" suffix per Microsemi documentation. This tolerance is verified at 31 mA test current and 25°C ambient. Tighter tolerances (e.g., ±2% or ±1%) require alternate suffixes (C or D) and are not applicable to the standard 1N3018BUR-1 part number.
Can 1N3018BUR-1 be used in RoHS-compliant manufacturing?
Yes - the "e3" suffix in 1N3018BUR-1 explicitly denotes RoHS compliance, including annealed matte-tin plating and qualification to IPC-J-STD-020D reflow profiles (260°C for 10 seconds). The device meets all substance restrictions and is fully compatible with lead-free assembly processes without derating.
What is the maximum steady-state power dissipation for 1N3018BUR-1 on a standard FR4 board?
When mounted on FR4 with 1 oz copper and Microsemi's recommended footprint, the 1N3018BUR-1 delivers 1.25 W at 25°C ambient temperature. This is derated linearly above 25°C per Figure 1, reaching zero power at 150°C ambient - consistent with its 120°C/W junction-to-ambient thermal resistance specification.
Does 1N3018BUR-1 have radiation-hardened characteristics?
Yes - the 1N3018BUR-1 exhibits inherent radiation hardness as documented in Microsemi MicroNote 050, attributable to its hermetically sealed double-slug glass construction and metallurgically enhanced contacts. It is qualified for use in TID environments typical of low-earth-orbit satellites and nuclear instrumentation.
How is polarity marked on the 1N3018BUR-1 package?
The 1N3018BUR-1 uses a single black cathode band on the glass MELF body to indicate polarity. During Zener operation, the banded end (cathode) must be held positive relative to the unbanded end (anode). This marking is visible under standard optical inspection and aligns with JEDEC DO-213AB mechanical standards.
1N3018BUR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 8.2 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 4.5 Ohms
- Current - Reverse Leakage @ Vr:
- 50 µA @ 6.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -55°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AB
1N3018BUR-1 FAQ
1.How can I place an order for 1N3018BUR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3018BUR-1 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 1N3018BUR-1 reliable?
The price and inventory of 1N3018BUR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N3018BUR-1 is usually 5 days.
3.What payment methods are accepted for 1N3018BUR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3018BUR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3018BUR-1?
1N3018BUR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3018BUR-1 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 1N3018BUR-1?
For technical support, including 1N3018BUR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3018BUR-1 requirements.
6.How does Aetrix verify that 1N3018BUR-1 is sourced from the original manufacturer or authorized distributors?
All 1N3018BUR-1 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 1N3018BUR-1 meets industry standards.
7.What is the process for return or replacement of 1N3018BUR-1?
All 1N3018BUR-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N3018BUR-1, 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 1N3018BUR-1 part is unused and in its original packaging.
Return procedure for 1N3018BUR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N3018BUR-1 Tags
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