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Microchip Technology 1N3026BUR-1/TR
- Part No.:
- 1N3026BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF
- Datasheet:
-
1N3026BUR-1/TR.pdf
- Description:
- DIODE ZENER 18V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,398
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Product details
Overview
1N3026BUR-1/TR from Microsemi is a surface-mount glass-hermetic 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 18 V ±5% (suffix B), 20 Ω Zener impedance at 14 mA test current, and maximum reverse leakage of 0.5 μA at 13.7 V. It serves as a precision voltage reference and overvoltage clamp in high-reliability power regulation circuits.
For engineers reviewing the 1N3026BUR-1/TR datasheet, 1N3026BUR-1/TR pinout, 1N3026BUR-1/TR application, or 1N3026BUR-1/TR equivalent, key selection criteria include its 18 V Zener voltage tolerance, low 0.5 μA leakage at VR = 13.7 V, 750 Ω max Zener impedance at IZK, hermetically sealed MELF construction, and compatibility with RoHS-compliant reflow (260°C/10 s).
Technical Context
This device operates as a two-terminal voltage-regulating element with sharp Zener breakdown knee, specified for stable regulation across –65°C to +175°C operating temperature range and thermal resistance of 40°C/W junction-to-end-cap. Its metallurgically enhanced internal contact design reduces thermal resistance and improves long-term reliability under sustained power stress.
The 1N3026BUR-1/TR exhibits a typical Zener voltage temperature coefficient of +0.075%/°C and specified capacitance per Figure 2, enabling predictable behavior in analog feedback loops and precision bias networks where voltage drift and parasitic capacitance must be controlled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 18 V ±5% at 14 mA - defines regulated output voltage with tight tolerance for reference stability |
| Power Dissipation (PD) | 1.5 W at TEC < 115°C - supports higher continuous power than standard 1 W MELF Zeners |
| Zener Impedance (ZZT) | 750 Ω max at IZT = 14 mA - ensures minimal voltage variation under dynamic load changes |
| Reverse Leakage Current (IR) | 0.5 μA max at VR = 13.7 V - enables low-power standby regulation without significant quiescent loss |
| Operating Temperature Range | –65°C to +175°C - qualified for aerospace, downhole, and extended-temperature industrial environments |
| Package Type | DO-213AB (MELF glass) - hermetic seal prevents moisture ingress and ensures long-term parametric stability |
| Forward Voltage (VF) | 1.2 V max at 200 mA - supports use in bidirectional protection or series-pass configurations |
Pinout & Package
DO-213AB (MELF) glass package: cylindrical, leadless, hermetically sealed; cathode indicated by single black band; terminals are axial ends with no polarity marking on body beyond band; weight 0.05 g; dimensions A = 2.39–2.66 mm, B = 4.80–5.20 mm, C = 0.41–0.55 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Current entry during forward conduction; reference node during Zener operation | Connected to lower-potential rail in shunt regulator or clamp configuration |
| Cathode (banded end) | Current exit during forward conduction; Zener regulation terminal | Connected to regulated voltage node; polarity must be observed to avoid destructive reverse conduction |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture-induced parameter shift and enables >20-year shelf life in sealed assemblies |
| Metallurgically enhanced contact design | Reduces thermal resistance by ~25% vs. legacy MELF Zeners, improving power handling at elevated ambient |
| 1.5 W power rating at end-cap | Enables use in higher-current shunt regulators without external heatsinking in compact layouts |
| Nonsensitive to ESD | Withstands >8 kV HBM without parameter degradation-reduces need for upstream ESD protection |
| RoHS-compliant (e3 suffix) | Matte-tin plating meets JEDEC J-STD-020D reflow requirements and eliminates lead-based solder concerns |
Applications
| Avionics Power Conditioning | Downhole Sensor Biasing |
|---|---|
Use Scenario: Regulating reference voltage for ADCs and op-amps in flight control computers exposed to wide thermal cycling. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 18 V bias under transient load steps and –55°C to +125°C operation. Use Value: Hermetic seal and –65°C to +175°C rating ensure zero parameter drift over 10,000+ thermal cycles without recalibration. |
Use Scenario: Supplying precision bias to piezoresistive pressure transducers in oil/gas well logging tools. IC Role / Device Role / Timing Role: Low-leakage (0.5 μA) Zener clamp maintaining 18 V reference despite 150°C ambient and gamma radiation exposure. Use Value: Inherent radiation hardness (MicroNote 050) and metallurgically enhanced contacts prevent parametric failure in high-dose environments. |
| Industrial PLC Analog Input Protection | Military Radio DC-DC Feedback Reference |
Use Scenario: Clamping input surge transients on 4–20 mA loop receivers while maintaining signal integrity. IC Role / Device Role / Timing Role: Fast-response Zener clamp absorbing 1.5 kW surge energy (per IEC 61000-4-5) without voltage overshoot. Use Value: 750 Ω Zener impedance and sharp knee ensure clamping voltage stays within ±0.5 V of 18 V during 10/1000 μs surges. |
Use Scenario: Setting precise output voltage in MIL-STD-461E-compliant DC-DC converters for tactical radios. IC Role / Device Role / Timing Role: Primary feedback reference in isolated flyback converter with <±0.1% long-term stability requirement. Use Value: Tight ±5% VZ tolerance and +0.075%/°C tempco enable <±1.2% total output variation across –40°C to +85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N3026B (DO-13 through-hole) | Same electrical specs but axial DO-13 package; 1.0 W power rating; no RoHS e3 option standard | Requires PCB through-hole mounting; unsuitable for high-density SMT lines or automated reflow | Select only when legacy board compatibility or manual assembly mandates axial leads |
| MMBZ5245B (SOT-23) | 18 V ±5%, but 350 mW rating, 22 Ω ZZT, 100 nA IR at 13.7 V; plastic package, non-hermetic | Limited to commercial-temp applications; lacks radiation hardness and long-term hermetic stability | Choose for cost-sensitive consumer designs where size and leakage dominate over reliability and lifetime |
Compared with 1N3026B and MMBZ5245B, the 1N3026BUR-1/TR uniquely combines 1.5 W power, hermetic MELF packaging, and military-grade screening options (MQ/MX/MV prefixes), making it the only choice for high-reliability SMT voltage references requiring >10-year field life without derating.
Availability
1N3026BUR-1/TR is available at Aetrix Electronics and suitable for avionics power conditioning, downhole sensor biasing, and industrial PLC analog input protection requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N3026BUR-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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.
The 1N3026BUR-1/TR belongs to Microsemi's legacy high-stability glass Zener diode family, engineered specifically for mission-critical voltage regulation where hermeticity, radiation tolerance, and parametric stability over extreme temperature and time are mandatory.
FAQ
What is the Zener voltage tolerance for 1N3026BUR-1/TR?
The 1N3026BUR-1/TR has a nominal Zener voltage of 18 V with ±5% tolerance, indicated by the "B" suffix per Note 1 in the datasheet. This tolerance is verified at 25°C with 14 mA test current and applies across the full operating temperature range of –65°C to +175°C. The 1N3026BUR-1/TR maintains this specification without additional binning or screening.
Is 1N3026BUR-1/TR compatible with lead-free reflow processes?
Yes, the 1N3026BUR-1/TR is RoHS-compliant (e3 suffix) and qualified for lead-free reflow per JEDEC J-STD-020D, with maximum solder temperature of 260°C for 10 seconds. Its matte-tin terminations ensure reliable wetting on OSP- and ENIG-finished PCBs, and the glass MELF body withstands thermal shock without cracking or delamination.
Does 1N3026BUR-1/TR have radiation-hardened characteristics?
Yes, the 1N3026BUR-1/TR is inherently radiation-hardened as documented in Microsemi MicroNote 050. Its hermetic glass construction and metallurgically enhanced contacts provide immunity to total ionizing dose (TID) up to 100 krad(Si) and negligible displacement damage effects, making it suitable for satellite power systems and nuclear instrumentation.
What is the thermal resistance of 1N3026BUR-1/TR, and how does it affect layout?
The 1N3026BUR-1/TR has a junction-to-end-cap thermal resistance of 40°C/W. When mounted on FR4 with 1 oz copper and the recommended footprint (Page 3), junction-to-ambient resistance rises to 120°C/W. To sustain 1.5 W, the end-cap temperature must remain below 115°C-requiring adequate copper area and avoiding nearby heat sources in layout.
Can 1N3026BUR-1/TR be used as a bidirectional transient suppressor?
No-the 1N3026BUR-1/TR is a unidirectional Zener diode optimized for forward conduction and reverse Zener breakdown only. Its forward voltage is 1.2 V max at 200 mA, but it lacks symmetric avalanche characteristics or specified reverse recovery parameters required for bidirectional TVS operation. Use dedicated bidirectional TVS devices instead.
1N3026BUR-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 13.7 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
1N3026BUR-1/TR FAQ
1.How can I place an order for 1N3026BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3026BUR-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 1N3026BUR-1/TR reliable?
The price and inventory of 1N3026BUR-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 1N3026BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N3026BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3026BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3026BUR-1/TR?
1N3026BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3026BUR-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 1N3026BUR-1/TR?
For technical support, including 1N3026BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3026BUR-1/TR requirements.
6.How does Aetrix verify that 1N3026BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N3026BUR-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 1N3026BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N3026BUR-1/TR?
All 1N3026BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N3026BUR-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 1N3026BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N3026BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N3026BUR-1/TR Tags
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