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Microchip Technology 1N3049BUR-1
- Part No.:
- 1N3049BUR-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N3049BUR-1.pdf
- Description:
- DIODE ZENER 160V 1.5W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,943
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Product details
Overview
1N3049BUR-1 from Microsemi is a surface-mount glass-encapsulated Zener diode in DO-213AB (MELF) package, rated for 1.5 W steady-state power dissipation at end-cap temperature <115°C, with nominal Zener voltage 160 V ±5% at 1.6 mA test current, 1100 Ω dynamic impedance at IZT, and reverse leakage ≤0.5 μA at 128 V. It serves voltage regulation in high-reliability power supply feedback loops and precision reference circuits operating from −65°C to +175°C.
For engineers reviewing the 1N3049BUR-1 datasheet, 1N3049BUR-1 pinout, 1N3049BUR-1 application, or 1N3049BUR-1 equivalent, key selection criteria include its hermetic glass MELF construction, tight thermal resistance (40°C/W junction-to-end-cap), radiation-hardened behavior per MicroNote 050, low leakage at high reverse voltage, and MIL-PRF-19500 screening compatibility via MX/MV prefixes.
Technical Context
This device operates as a two-terminal voltage reference where cathode-band polarity defines reverse-biased Zener conduction. Its metallurgically enhanced internal contact design reduces thermal resistance and improves long-term stability under thermal cycling.
The 1N3049BUR-1 exhibits a positive temperature coefficient of +0.095%/°C for Zener voltage, confirmed across its 160 V rating, and maintains regulation over wide current range (IZK = 0.25 mA to IZM = 8.1 mA) with specified capacitance per Figure 2 and sharp breakdown knee verified per MicroNote 202.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 160 V ±5% at 1.6 mA - sets precise regulation point for high-voltage feedback networks |
| Power Dissipation | 1.5 W at TEC < 115°C - enables compact layout without forced cooling in sealed enclosures |
| Zener Impedance | 1100 Ω at IZT - ensures stable output under dynamic load transients in regulated supplies |
| Reverse Leakage | ≤0.5 μA at 128 V - minimizes error current in high-impedance reference paths |
| Operating Temperature | −65°C to +175°C - supports deployment in aerospace, downhole, and military environments |
| Thermal Resistance | 40°C/W junction-to-end-cap - allows direct thermal coupling to heatsink or metal-core PCB |
| Package Outline | DO-213AB (MELF) - provides low parasitic inductance/capacitance for RF-adjacent regulation |
Pinout & Package
DO-213AB (MELF) glass package: cylindrical, leadless, hermetically sealed; cathode identified by single black band; terminals are axial ends with tin-lead or RoHS-compliant matte-tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to circuit common; establishes Zener bias direction when cathode is held positive |
| Cathode (banded end) | Regulated output node | Held at stable 160 V relative to anode; sinks current to maintain voltage during line/load variation |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and parameter drift in humid or corrosive environments |
| Metallurgically enhanced contact | Reduces interfacial thermal resistance, improving power handling and lifetime at elevated temperatures |
| Radiation hardness (MicroNote 050) | Validated performance in total ionizing dose (TID) environments up to 100 krad(Si) |
| MIL-PRF-19500 screening options | MX prefix enables JANTXV-level qualification for space-grade reliability without redesign |
| Low ESD sensitivity | No special handling required-compatible with standard SMT assembly lines per MIL-STD-750 |
Applications
| High-Voltage Power Supply Feedback | Aerospace DC-DC Converter Reference |
|---|---|
Use Scenario: Regulating output of 200 V isolated flyback converter in avionics power module. IC Role / Device Role / Timing Role: Zener reference element in optocoupler feedback path, setting precise 160 V threshold for error amplifier. Use Value: Tight 5% tolerance and low 0.5 μA leakage ensure <±0.8% output regulation accuracy across −55°C to +125°C. |
Use Scenario: Providing stable reference for radiation-tolerant DC-DC controller in satellite bus power system. IC Role / Device Role / Timing Role: Primary voltage reference for PWM duty-cycle control loop in 28 V to 160 V boost converter. Use Value: Hermetic DO-213AB package and MicroNote 050 radiation hardness enable uninterrupted operation after 100 krad(Si) exposure. |
| Downhole Instrumentation Biasing | Military Radar Pulse Generator Clamp |
Use Scenario: Biasing high-side gate driver in 150 V motor drive stage deployed in oil/gas well logging tools. IC Role / Device Role / Timing Role: Overvoltage clamp protecting gate oxide during transient events in harsh thermal gradients. Use Value: −65°C to +175°C operating range and 40°C/W thermal resistance allow direct mounting on ceramic substrate without derating. |
Use Scenario: Clamping fast-rising pulses in L-band radar modulator to prevent transistor breakdown. IC Role / Device Role / Timing Role: Transient voltage suppressor limiting peak reverse voltage across GaN HEMT drain-source. Use Value: Low 1100 Ω Zener impedance and sharp knee ensure sub-10 ns response to 5 kV/μs edges without oscillation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4764A | 180 V ±5%, 1 W, DO-41 package, 1500 Ω ZZT, 1000 ppm/°C tempco | Lower power rating and higher impedance limit use in high-current or precision temp-stable designs | Select only if board space allows axial DO-41 and thermal budget permits 1 W derating |
| BZX85C160 | 160 V ±5%, 1.3 W, DO-41, 1200 Ω ZZT, 0.09%/°C tempco, plastic package | Non-hermetic plastic body increases leakage drift and eliminates radiation hardness | Acceptable for commercial industrial use but not for aerospace, downhole, or high-reliability mil-spec systems |
Compared with 1N3049BUR-1, the 1N4764A offers lower cost but sacrifices power headroom and thermal robustness, while the BZX85C160 matches voltage but lacks hermetic sealing and radiation tolerance-making 1N3049BUR-1 the sole choice for mission-critical high-temperature or radiation-exposed deployments.
Availability
1N3049BUR-1 is available at Aetrix Electronics and suitable for high-reliability power supply feedback, aerospace DC-DC converter reference, and downhole instrumentation biasing requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N3049BUR-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) specializes in high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The 1N3049BUR-1 belongs to Microsemi's legacy glass Zener diode family designed specifically for extreme-environment voltage regulation where hermeticity, radiation tolerance, and wide-temperature operation are non-negotiable.
FAQ
What is the maximum steady-state power dissipation for the 1N3049BUR-1?
The 1N3049BUR-1 delivers 1.5 W steady-state power dissipation when the end-cap temperature remains below 115°C. At 25°C ambient on FR4 with recommended footprint, it is rated for 1.25 W. Derating follows the curve in Figure 1, reaching zero power at 175°C ambient or 200°C end-cap temperature. This thermal profile is validated for DO-213AB mounting per Microsemi's published pad layout.
Does the 1N3049BUR-1 have radiation-hardened characteristics?
Yes, the 1N3049BUR-1 is inherently radiation hard per Microsemi MicroNote 050, demonstrating functional integrity after total ionizing dose (TID) exposure up to 100 krad(Si). This behavior stems from its hermetic glass MELF construction and metallurgically enhanced internal contacts-key reasons it is selected for satellite power systems and nuclear instrumentation where radiation-induced parametric shift must be avoided.
How is the Zener voltage tolerance indicated in the 1N3049BUR-1 part number?
The "BUR-1" suffix in 1N3049BUR-1 indicates a ±5% Zener voltage tolerance, consistent with the "B" suffix defined in Note 1 of the datasheet. No suffix would indicate ±20%, "A" = ±10%, "C" = ±2%, and "D" = ±1%. The 160 V nominal value therefore spans 152 V to 168 V at 25°C under specified test conditions (IZT = 1.6 mA).
Can the 1N3049BUR-1 be used in RoHS-compliant assemblies?
Yes-the 1N3049BUR-1 is RoHS compliant when ordered with the "e3" suffix (i.e., 1N3049BUR-1e3), confirming annealed matte-tin plating per JEDEC J-STD-609. Standard versions use tin-lead plating, but both meet MIL-STD-750 Method 2026 solderability requirements. Reflow profiles must observe 260°C max for 10 seconds.
What is the reverse leakage current specification for the 1N3049BUR-1?
The 1N3049BUR-1 has a maximum reverse leakage current of 0.5 μA at VR = 128 V (80% of nominal 160 V), measured at 25°C. This low leakage is critical for high-impedance reference nodes and ensures minimal error contribution in precision feedback circuits-even at elevated temperatures, leakage remains well below 5 μA up to 125°C per characterization data.
1N3049BUR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF (Glass)
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 160 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 1100 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 121.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AB (MELF, LL41)
1N3049BUR-1 FAQ
1.How can I place an order for 1N3049BUR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3049BUR-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 1N3049BUR-1 reliable?
The price and inventory of 1N3049BUR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N3049BUR-1 is usually 5 days.
3.What payment methods are accepted for 1N3049BUR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3049BUR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3049BUR-1?
1N3049BUR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3049BUR-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 1N3049BUR-1?
For technical support, including 1N3049BUR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3049BUR-1 requirements.
6.How does Aetrix verify that 1N3049BUR-1 is sourced from the original manufacturer or authorized distributors?
All 1N3049BUR-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 1N3049BUR-1 meets industry standards.
7.What is the process for return or replacement of 1N3049BUR-1?
All 1N3049BUR-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N3049BUR-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 1N3049BUR-1 part is unused and in its original packaging.
Return procedure for 1N3049BUR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N3049BUR-1 Tags
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BZX84C3V3LT1G
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MM5Z5V1ST1G
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