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Microchip Technology 1N3028BUR-1/TR
- Part No.:
- 1N3028BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N3028BUR-1/TR.pdf
- Description:
- DIODE ZENER 22V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,771
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Product details
Overview
1N3028BUR-1 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 22 V at 11.5 mA test current, dynamic impedance 23 Ω at IZT, and maximum reverse leakage current 0.25 mA at 17 V. It serves as a precision voltage reference or regulator in high-reliability analog power supply circuits.
For engineers reviewing the 1N3028BUR-1 datasheet, 1N3028BUR-1 pinout, 1N3028BUR-1 application, or 1N3028BUR-1 equivalent, key selection criteria include its ±5% voltage tolerance option, -55 °C to +175 °C junction temperature range, 50 °C/W junction-to-end-cap thermal resistance, and MIL-PRF-19500/115 qualification readiness for aerospace and defense systems.
Technical Context
This device implements a silicon planar Zener structure with double-plug glass hermetic sealing and metallurgically enhanced internal contact design, enabling stable regulation across wide temperature and current ranges. Its breakdown knee is characterized by low dynamic impedance (23 Ω at 11.5 mA) and tightly controlled temperature coefficient (0.093 %/°C).
The DO-213AB MELF package provides low parasitic inductance and capacitance, making it suitable for noise-sensitive regulation and high-frequency transient suppression. Polarity is defined by a cathode band, requiring the banded end to be biased positive relative to the opposite terminal during Zener operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22 V nominal at 11.5 mA - defines precise regulation point for feedback loops and reference generation |
| Power Dissipation (PD) | 1.0 W - supports continuous regulation in compact SMT layouts without forced cooling |
| Dynamic Impedance (ZZT) | 23 Ω at IZT - ensures minimal output voltage variation under load transients |
| Reverse Leakage Current (IR) | 0.25 mA max at 17 V - guarantees low quiescent current in standby or battery-powered circuits |
| Junction Temperature Range | -55 °C to +175 °C - enables operation in extreme environments including avionics and downhole electronics |
| Thermal Resistance (RθJEC) | 50 °C/W - allows accurate thermal modeling when mounted on copper end caps or thermally conductive pads |
Pinout & Package
DO-213AB (MELF/LL41) glass hermetic package: cylindrical body with axial symmetry, cathode band marking, no leads - designed for reflow soldering on end-cap pads. Dimensions: BD = 2.39–2.67 mm, BL = 4.80–5.21 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode of reverse-biased Zener | Must be connected to higher potential node to enable Zener conduction and regulation |
| Anode (unbanded end) | Cathode of reverse-biased Zener | Connected to lower potential node; forms regulated output reference point |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass seal | Prevents moisture ingress and long-term parameter drift in harsh environments |
| Metallurgically bonded construction | Reduces thermal resistance and improves reliability under thermal cycling stress |
| MIL-PRF-19500/115 qualification path | Supports JAN/JANTX/JANTXV screening for mission-critical military and space applications |
| Low ESD sensitivity | Eliminates need for external ESD protection in handling and assembly |
| Radiation hardness | Inherently tolerant to total ionizing dose per Microsemi MicroNote 050 - suitable for satellite subsystems |
Applications
| Avionics Power Regulation | Downhole Instrumentation Reference |
|---|---|
|
Use Scenario: Regulating auxiliary 24 V rail in flight control computers where ambient temperature swings from -55 °C to +125 °C. IC Role / Device Role / Timing Role: Precision shunt voltage reference providing stable bias for op-amps and ADC references. Use Value: Maintains <±1% output stability over full temperature range due to low αVZ (0.093 %/°C) and hermetic packaging. |
Use Scenario: Providing stable 22 V reference in high-temperature logging tools operating at 175 °C downhole. IC Role / Device Role / Timing Role: High-temperature Zener regulator for sensor excitation and signal conditioning front-ends. Use Value: Operates continuously at 175 °C junction temperature with no derating loss below 125 °C, enabled by 50 °C/W RθJEC. |
| Satellite Power Management | Military Radio Bias Supply |
|
Use Scenario: Voltage clamping and reference generation in LEO satellite EPS units exposed to >100 krad(Si) TID. IC Role / Device Role / Timing Role: Radiation-hardened shunt regulator protecting downstream DC-DC converters. Use Value: Inherent radiation tolerance eliminates need for shielding or redundancy, reducing SWaP-C. |
Use Scenario: Setting stable bias points in wideband HF transceiver RF power amplifier stages. IC Role / Device Role / Timing Role: Low-noise, low-parasitic Zener reference for gain control and AGC circuitry. Use Value: MELF geometry minimizes stray inductance/capacitance, preserving RF signal integrity up to 100 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N3028B-1 | Same electrical specs but in DO-41 axial-leaded package; lacks MIL-PRF-19500/115 qualification path | Preferred for prototyping or through-hole legacy designs; not suitable for high-density SMT or high-reliability screening | Select only if board layout requires axial leads or qualification is unnecessary |
| BZX84-C22 | 22 V, 300 mW SOT-23 package; ±5% tolerance; RoHS-compliant; no military qualification or hermetic seal | Used in commercial portable electronics; unsuitable for >125 °C or radiation-exposed environments | Choose for cost-sensitive, low-power consumer applications where size and lead-free compliance are primary |
Compared with 1N3028B-1 and BZX84-C22, the 1N3028BUR-1 uniquely combines 1 W power handling, DO-213AB low-parasitic packaging, hermetic sealing, and MIL-PRF-19500 qualification readiness-making it the sole choice for high-reliability SMT Zener regulation where thermal, radiation, and mechanical robustness are non-negotiable.
Availability
1N3028BUR-1 is available at Aetrix Electronics and suitable for avionics power regulation, downhole instrumentation reference, and satellite power management requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N3028BUR-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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N3028BUR-1 belongs to Microsemi's MIL-qualified Zener diode family designed specifically for precision voltage regulation in mission-critical systems where long-term stability, hermetic integrity, and extreme environmental resilience are mandatory.
FAQ
What is the Zener voltage tolerance option available for 1N3028BUR-1?
The 1N3028BUR-1 is offered with ±5% Zener voltage tolerance (denoted by "B" in part nomenclature). This tolerance is verified per MIL-PRF-19500/115 test requirements and applies across the full operating temperature range of -55 °C to +175 °C. The 1N3028BUR-1 does not support tighter 2% or 1% tolerances - those are available only in other variants like 1N3028CUR-1 or 1N3028DUR-1.
Is 1N3028BUR-1 qualified to MIL-PRF-19500/115 standards?
The 1N3028BUR-1 is manufactured to meet MIL-PRF-19500/115 requirements and is available in JAN, JANTX, and JANTXV reliability levels upon order. The "UR" suffix indicates surface-mount MELF construction and metallurgical bonding, both required for qualification. Commercial-grade 1N3028BUR-1 units are fully process-qualified and can be screened to military levels per customer specification.
What is the maximum steady-state power dissipation for 1N3028BUR-1 at 125 °C ambient?
At 125 °C case (end-cap) temperature, the 1N3028BUR-1 must be derated linearly from 1.0 W at 125 °C to 0 W at 175 °C per Figure 1 in the datasheet. Therefore, maximum allowable power at 125 °C is 1.0 W; at 150 °C it is 0.5 W. Derating is based on end-cap temperature (TEC), not ambient - proper thermal pad design is essential to maintain TEC ≤ 125 °C.
Does 1N3028BUR-1 have a specified forward voltage rating?
Yes - the 1N3028BUR-1 has a maximum forward voltage (VF) of 1.2 V at 200 mA forward current, as stated in the Maximum Ratings table. This value is measured under DC conditions and reflects the diode's anode-to-cathode conduction drop when used in forward-biased configurations such as ESD protection or polarity protection circuits.
Can 1N3028BUR-1 be used in reflow soldering processes?
Yes - the 1N3028BUR-1 is qualified for standard lead-free reflow soldering with peak temperature up to 260 °C for 10 seconds, per MIL-STD-750 Method 2026. Its DO-213AB glass MELF package and matte-tin or tin/lead terminations ensure reliable wetting and joint integrity. Thermal profile must avoid thermal shock; ramp rates should comply with IPC-J-STD-020.
1N3028BUR-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):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 23 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 16.7 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)
1N3028BUR-1/TR FAQ
1.How can I place an order for 1N3028BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3028BUR-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 1N3028BUR-1/TR reliable?
The price and inventory of 1N3028BUR-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 1N3028BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N3028BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3028BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3028BUR-1/TR?
1N3028BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3028BUR-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 1N3028BUR-1/TR?
For technical support, including 1N3028BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3028BUR-1/TR requirements.
6.How does Aetrix verify that 1N3028BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N3028BUR-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 1N3028BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N3028BUR-1/TR?
All 1N3028BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N3028BUR-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 1N3028BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N3028BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N3028BUR-1/TR Tags
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