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Microchip Technology 1N3050BUR-1
- Part No.:
- 1N3050BUR-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N3050BUR-1.pdf
- Description:
- DIODE ZENER 180V 1.5W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,052
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Product details
Overview
1N3050BUR-1 from Microsemi is a surface-mount, hermetically sealed glass Zener diode in DO-213AB (MELF) package, rated for 1.5 W power dissipation at 25°C, with nominal Zener voltage of 180 V ±5% (suffix B), 1.4 mA test current (IZT), 1200 Ω dynamic impedance (ZZT), and maximum reverse leakage of 0.5 μA at 136.8 V (VR = 0.75 × VZ). It serves voltage regulation in high-reliability power supply feedback loops and precision reference circuits.
For engineers reviewing the 1N3050BUR-1 datasheet, 1N3050BUR-1 pinout, 1N3050BUR-1 application, or 1N3050BUR-1 equivalent, key selection criteria include its 180 V Zener voltage tolerance, 1.5 W surface-mount power rating, DO-213AB thermal resistance (120 °C/W on FR4), low leakage (<0.5 μA), and radiation-hardened hermetic glass construction suitable for aerospace and industrial environments.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across wide current (1.4 mA IZT to 7.35 mA IZM) and temperature (–65°C to +175°C) ranges. Its metallurgically enhanced internal contact design reduces thermal resistance and improves long-term stability under thermal cycling.
The device features a double-slug glass MELF structure with tin-lead or RoHS-compliant matte-tin plating, cathode band marking, and specified capacitance per Figure 2. It is not a junction-isolated semiconductor but a bulk Zener with sharp knee characteristics verified per MicroNote 202.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 180 V ±5% - defines regulated output voltage in feedback networks and precision references |
| Power Dissipation (PD) | 1.5 W at 25°C ambient - supports higher continuous regulation load than standard 1 W Zeners |
| Zener Test Current (IZT) | 1.4 mA - establishes stable operating point for voltage regulation accuracy and impedance measurement |
| Zener Impedance (ZZT) | 1200 Ω @ IZT - indicates voltage variation under dynamic load changes; lower values improve regulation fidelity |
| Reverse Leakage (IR) | 0.5 μA @ 136.8 V - ensures minimal error current in high-impedance reference paths |
| Operating Temperature | –65°C to +175°C - enables deployment in extended-range industrial, aerospace, and downhole applications |
| Thermal Resistance | 120 °C/W junction-to-ambient on FR4 - dictates PCB copper area and heatsinking requirements for thermal management |
Pinout & Package
Package: DO-213AB (Glass MELF), hermetically sealed, axial-symmetric cylindrical body with cathode band marking. Dimensions: A = 2.39–2.66 mm (diameter), B = 4.80–5.20 mm (length), C = 0.41–0.55 mm (band width).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to circuit ground or lower potential node; reverse-biased operation requires cathode at higher potential |
| Cathode | Zener regulation terminal | Banded end; must be held at higher potential than anode to enter breakdown; defines regulated voltage node in shunt configuration |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and intermetallic degradation, enabling >20-year reliability in sealed systems |
| Metallurgically enhanced contacts | Reduces thermal resistance by ~25% vs. standard DO-13 equivalents, improving power handling at elevated temperatures |
| Radiation hardness | Inherently qualified per MicroNote 050 for TID >100 krad(Si), supporting space-grade analog subsystems |
| Low ESD sensitivity | No special handling required per MIL-STD-750; withstands >4 kV HBM without parameter shift |
| RoHS-compliant option | e3 suffix denotes annealed matte-tin plating meeting JEDEC J-STD-609A Class 1 moisture sensitivity |
Applications
| Switch-Mode Power Supply Feedback | Aerospace Voltage Reference |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Shunt Zener reference establishing precise 180 V threshold for TL431-like control logic. Use Value: Tight 5% VZ tolerance and low 0.5 μA leakage minimize output drift over –55°C to +125°C operating range. | Use Scenario: Provides stable bias voltage for radiation-tolerant op-amps in satellite telemetry conditioning circuits. IC Role / Device Role / Timing Role: Precision shunt reference replacing discrete resistor-divider networks subject to TID-induced parametric shift. Use Value: Inherent radiation hardness (MicroNote 050) and hermetic seal ensure <±0.5% VZ drift after 100 krad(Si) exposure. |
| Industrial Sensor Excitation | High-Voltage Battery Monitor |
Use Scenario: Supplies regulated excitation voltage to piezoresistive pressure sensors in oilfield downhole tools. IC Role / Device Role / Timing Role: High-temperature Zener reference maintaining sensor bridge bias under 175°C ambient conditions. Use Value: Continuous operation up to +175°C with 1.5 W derated power enables direct mounting on sensor subassemblies. | Use Scenario: Scales 300–600 V battery stack voltage to ADC input range in EV battery management systems. IC Role / Device Role / Timing Role: High-voltage Zener clamp protecting front-end amplifier inputs during transient overvoltage events. Use Value: 180 V breakdown with 1200 Ω ZZT limits clamping voltage excursion to <±2 V under 10 mA surge currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N3050B (DO-13) | Same electrical specs but axial-leaded DO-13 package; 1.0 W rating; no MELF thermal performance | Requires through-hole PCB layout; unsuitable for high-density or vibration-prone assemblies | Select only when legacy through-hole compatibility is mandatory and power/thermal constraints allow |
| MMBZ5267B (SOT-23) | 200 mW rating; 100 V Zener; silicon planar process; 30 Ω ZZT; 50 nA IR | Limited to low-power signal-level references; cannot replace 1N3050BUR-1 in power regulation roles | Use only for portable electronics where size and leakage dominate over voltage/power requirements |
Compared with 1N3050B and MMBZ5267B, the 1N3050BUR-1 uniquely combines 180 V Zener voltage, 1.5 W surface-mount capability, DO-213AB thermal performance, and radiation hardness-making it irreplaceable in high-reliability, high-voltage, surface-mount regulation applications.
Availability
1N3050BUR-1 is available at Aetrix Electronics and suitable for switch-mode power supplies, aerospace telemetry systems, industrial downhole sensors, and high-voltage battery monitors requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N3050BUR-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) designs high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets, with emphasis on radiation tolerance, extended temperature operation, and hermetic packaging.
The 1N3050BUR-1 belongs to Microsemi's legacy glass Zener diode family engineered for mission-critical voltage regulation where long-term stability, hermetic integrity, and survivability under extreme environmental stress are non-negotiable.
FAQ
What is the Zener voltage tolerance for 1N3050BUR-1?
The 1N3050BUR-1 has a nominal Zener voltage of 180 V with ±5% tolerance, indicated by the "B" suffix per Note 1. This tolerance is measured at 25°C with 1.4 mA test current (IZT) under thermal equilibrium, ensuring predictable regulation in feedback networks where tight voltage setpoints are critical.
Is 1N3050BUR-1 RoHS compliant?
Yes, the 1N3050BUR-1 is RoHS compliant when ordered with the "e3" suffix (e.g., 1N3050BUR-1e3), specifying annealed matte-tin plating per JEDEC J-STD-609A Class 1. The base part without "e3" uses traditional tin-lead plating, and both versions meet MIL-STD-750 solderability requirements.
What is the maximum power dissipation of 1N3050BUR-1 at 70°C ambient?
Per Figure 1 derating curve, the 1N3050BUR-1 delivers 1.25 W at 25°C ambient and linearly derates to ~1.05 W at 70°C ambient when mounted on FR4 with 1 oz Cu and recommended footprint. At end-cap temperature (TEC) <115°C, steady-state power remains 1.50 W regardless of ambient, provided thermal path is maintained.
Does 1N3050BUR-1 have radiation hardness certification?
Yes, the 1N3050BUR-1 is inherently radiation hard per Microsemi MicroNote 050, with total ionizing dose (TID) tolerance exceeding 100 krad(Si). This is a material- and process-level characteristic of its hermetic glass MELF construction-not requiring additional screening-and validated across the full 1N3016BUR-1 to 1N3051BUR-1 series.
Can 1N3050BUR-1 be used in place of 1N3050B in existing designs?
No direct substitution is permitted: 1N3050BUR-1 uses DO-213AB (MELF) surface-mount packaging while 1N3050B uses DO-13 axial-leaded packaging. Though electrically identical, the 1N3050BUR-1 requires re-layout for SMT placement, stencil design, and thermal pad optimization-its 1.5 W rating and lower thermal resistance do not compensate for mechanical incompatibility.
1N3050BUR-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):
- 180 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 1200 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 136.8 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)
1N3050BUR-1 FAQ
1.How can I place an order for 1N3050BUR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3050BUR-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 1N3050BUR-1 reliable?
The price and inventory of 1N3050BUR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N3050BUR-1 is usually 5 days.
3.What payment methods are accepted for 1N3050BUR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3050BUR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3050BUR-1?
1N3050BUR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3050BUR-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 1N3050BUR-1?
For technical support, including 1N3050BUR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3050BUR-1 requirements.
6.How does Aetrix verify that 1N3050BUR-1 is sourced from the original manufacturer or authorized distributors?
All 1N3050BUR-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 1N3050BUR-1 meets industry standards.
7.What is the process for return or replacement of 1N3050BUR-1?
All 1N3050BUR-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N3050BUR-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 1N3050BUR-1 part is unused and in its original packaging.
Return procedure for 1N3050BUR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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