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Microchip Technology 1N3029BUR-1/TR
- Part No.:
- 1N3029BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N3029BUR-1/TR.pdf
- Description:
- DIODE ZENER 24V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,233
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Product details
Overview
1N3029BUR-1/TR 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 24 V at 10.5 mA test current, dynamic impedance 25 Ω at IZT, and reverse leakage ≤0.25 µA at 19.2 V. It serves as a precision voltage reference or shunt regulator in high-reliability power supply feedback paths.
For engineers reviewing the 1N3029BUR-1/TR datasheet, 1N3029BUR-1/TR pinout, 1N3029BUR-1/TR application, or 1N3029BUR-1/TR 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 matte-tin termination option, and MIL-PRF-19500/115 qualification availability (JAN/JANTX/JANTXV).
Technical Context
This device operates as a silicon planar Zener diode with sharp breakdown knee and low dynamic impedance, optimized for stable regulation across wide current (IZK = 10.5 mA to IZM = 25 mA) and temperature (-55°C to +175°C) ranges. Its double-plug glass hermetic seal and metallurgically enhanced internal contact structure deliver low thermal resistance and radiation hardness per MicroNote 050.
The DO-213AB MELF package provides low parasitic inductance/capacitance and axial coefficient of expansion (+6 ppm/°C) matched to common PCB substrates. Polarity is defined by cathode band; operation requires banded end positive for Zener regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 24 V ±5% at 10.5 mA - defines regulated output voltage with tight tolerance for feedback loop accuracy |
| Power Dissipation PD | 1.0 W - maximum continuous DC power handling at TEC ≤125°C, derated linearly to zero at 175°C |
| Zener Impedance ZZT | 25 Ω at IZT - low dynamic impedance ensures minimal output voltage variation under load transients |
| Reverse Leakage IR | ≤0.25 µA at VR = 19.2 V - ultra-low leakage preserves regulation stability in high-impedance bias networks |
| Junction Temp Range | -55°C to +175°C - supports operation in extended industrial, aerospace, and downhole environments |
| Thermal Resistance RθJEC | 50°C/W - enables predictable thermal design when mounted on thermally conductive end caps or pads |
| Forward Voltage VF | 1.2 V at 200 mA - specifies forward conduction drop for polarity verification or clamping use cases |
Pinout & Package
DO-213AB (MELF/LL41) glass hermetic package: cylindrical body with axial leads, cathode identified by black band; dimensions BD = 2.39–2.67 mm, BL = 4.80–5.21 mm; weight ≈0.05 g; RoHS-compliant matte-tin or SnPb terminations available.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode of Zener breakdown path | Connected to higher potential node during regulation; defines polarity for proper shunt operation |
| Anode (unbanded end) | Cathode of Zener breakdown path | Connected to lower potential node (e.g., ground or feedback reference); completes Zener conduction path |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and long-term parameter drift in harsh environments |
| Metallurgically bonded junction | Reduces thermal resistance and improves reliability under thermal cycling stress |
| Low ESD sensitivity | Enables safe handling without special grounding protocols during SMT assembly |
| Radiation hardness | Validated per MicroNote 050 for total ionizing dose (TID) resilience in space applications |
| MIL-PRF-19500/115 qualification | Supports JAN/JANTX/JANTXV screening for defense and aerospace programs requiring traceable reliability data |
Applications
| Industrial Power Supply Feedback | Aerospace Voltage Reference |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converter feedback loops where primary-side sensing is required. IC Role / Device Role / Timing Role: Shunt regulator providing precise 24 V reference to optocoupler input or TL431 comparator. Use Value: Maintains ±1% output regulation over -40°C to +125°C ambient due to low αVZ (0.094%/°C) and stable ZZT. |
Use Scenario: Providing stable bias voltage for analog front-ends in satellite telemetry modules exposed to radiation. IC Role / Device Role / Timing Role: Radiation-hardened Zener reference replacing less robust commercial alternatives in critical signal chains. Use Value: Delivers verified TID resilience and <0.25 µA leakage at 19.2 V, ensuring reference integrity after 100 krad(Si) exposure. |
| Downhole Oilfield Sensor Bias | High-Temperature Motor Control |
Use Scenario: Generating stable 24 V bias for pressure/temperature transducers operating at 150°C wellhead temperatures. IC Role / Device Role / Timing Role: High-temperature Zener reference enabling sensor excitation and ADC reference scaling. Use Value: Operates continuously at TJ = 175°C with 1 W dissipation capability and validated -55°C to +175°C qualification envelope. |
Use Scenario: Clamping gate drive voltages in IGBT-based motor inverters subjected to thermal cycling and EMI. IC Role / Device Role / Timing Role: Transient voltage suppressor and clamp diode protecting gate drivers from overshoot. Use Value: Low ZZT (25 Ω) and fast response ensure sub-10 ns clamping with minimal energy absorption during switching spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N3029UR-1 | Same 24 V Zener voltage and DO-213AB package, but commercial-grade only (no MIL-PRF-19500/115 qualification) | Lacks JAN/JANTX/JANTXV screening; suitable for non-military industrial designs with relaxed reliability requirements | Select when cost sensitivity outweighs need for military screening and full traceability |
| BZX84-C24LT1G | SOT-23 package, 24 V ±5%, 350 mW rating, 80 Ω ZZT - smaller footprint but lower power and higher impedance | Used in space-constrained consumer electronics; not rated for >125°C or radiation environments | Choose for compact PCB layouts where 1 W dissipation and extended temperature range are unnecessary |
Compared with 1N3029BUR-1/TR, 1N3029UR-1 offers identical electrical specs without military qualification overhead, while BZX84-C24LT1G trades power handling and thermal robustness for miniaturization-making the former ideal for high-reliability systems and the latter for cost-optimized consumer designs.
Availability
1N3029BUR-1/TR is available at Aetrix Electronics and suitable for industrial power supplies, aerospace telemetry systems, downhole oilfield sensors, and high-temperature motor control circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N3029BUR-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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and military-qualified analog and mixed-signal components.
The 1N3029BUR-1/TR belongs to Microsemi's legacy MIL-PRF-19500/115-qualified Zener diode family, engineered for mission-critical voltage regulation in aerospace, defense, and extreme-environment industrial systems.
FAQ
What is the Zener voltage tolerance for 1N3029BUR-1/TR?
The 1N3029BUR-1/TR has a nominal Zener voltage of 24 V with a ±5% tolerance (B-grade), meaning the actual VZ falls between 22.8 V and 25.2 V when measured at 10.5 mA and 25°C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0285-1 Rev. 1, and applies to all units regardless of qualification level (JAN/JANTX/JANTXV/commercial).
Is 1N3029BUR-1/TR RoHS compliant?
Yes, 1N3029BUR-1/TR is available in RoHS-compliant versions with matte-tin termination (designated by "e3" suffix per nomenclature), but only for commercial-grade units. MIL-qualified variants (JAN/JANTX/JANTXV) retain SnPb terminations to meet legacy military soldering standards and are not RoHS compliant.
What is the maximum reverse leakage current for 1N3029BUR-1/TR?
The maximum reverse leakage current (IR) for 1N3029BUR-1/TR is 0.25 µA at VR = 19.2 V and 25°C, as specified in the Electrical Characteristics table. This ultra-low leakage ensures minimal error in high-impedance reference circuits and contributes to stable regulation over temperature.
Can 1N3029BUR-1/TR be used in high-temperature environments?
Yes, 1N3029BUR-1/TR is rated for junction temperatures from -55°C to +175°C and features a thermal resistance of 50°C/W. Its hermetic glass MELF package and metallurgically bonded construction enable reliable operation in downhole, engine bay, and avionics applications where ambient temperatures exceed 125°C.
Does 1N3029BUR-1/TR require special PCB layout considerations?
Yes - the DO-213AB package has an axial coefficient of expansion of +6 ppm/°C, so the mounting surface should match this COE to minimize mechanical stress. Pad layout must follow the recommended dimensions (A = 7.00 mm, B = 1.8 mm, C = 2.8 mm) shown on page 5, and reflow profile must comply with 260°C peak for 10 seconds per MIL-STD-750.
1N3029BUR-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):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 18.2 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)
1N3029BUR-1/TR FAQ
1.How can I place an order for 1N3029BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3029BUR-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 1N3029BUR-1/TR reliable?
The price and inventory of 1N3029BUR-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 1N3029BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N3029BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3029BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3029BUR-1/TR?
1N3029BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3029BUR-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 1N3029BUR-1/TR?
For technical support, including 1N3029BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3029BUR-1/TR requirements.
6.How does Aetrix verify that 1N3029BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N3029BUR-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 1N3029BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N3029BUR-1/TR?
All 1N3029BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N3029BUR-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 1N3029BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N3029BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N3029BUR-1/TR Tags
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