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Microchip Technology 1N3021BUR-1/TR
- Part No.:
- 1N3021BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF
- Datasheet:
-
1N3021BUR-1/TR.pdf
- Description:
- DIODE ZENER 11V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,076
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Product details
Overview
1N3021BUR-1/TR 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 11 V at 23 mA test current, maximum Zener impedance 8 Ω at IZT, and reverse leakage ≤1.0 μA at 8.4 V. It serves as a precision voltage reference and overvoltage clamp in high-reliability power regulation circuits.
For engineers reviewing the 1N3021BUR-1/TR datasheet, 1N3021BUR-1/TR pinout, 1N3021BUR-1/TR application, or 1N3021BUR-1/TR equivalent, key selection criteria include its 11 V Zener voltage tolerance (±5% standard), low thermal resistance (40 °C/W junction-to-end-cap), radiation-hardened construction, RoHS-compliant e3 variant availability, and tape-and-reel packaging (TR suffix) for automated assembly.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across a wide current range (IZK = 0.25 mA to IZM = 127.5 mA) and temperature range (–65°C to +175°C). Its metallurgically enhanced internal contact design reduces thermal resistance and improves long-term stability under thermal cycling.
The DO-213AB glass MELF package provides hermetic sealing, low parasitic capacitance (specified in Figure 2), ESD insensitivity, and compatibility with standard SMT reflow profiles (260°C/10 s max). Polarity is marked by a cathode band; regulation requires cathode-positive bias relative to anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 11 V at 23 mA test current - defines primary regulation point under thermal equilibrium at 25°C |
| Power Dissipation (PD) | 1.5 W at 25°C end-cap temperature - supports robust voltage clamping in compact layouts |
| Zener Impedance (ZZT) | 8 Ω at IZT - ensures minimal output voltage variation under dynamic load changes |
| Reverse Leakage Current (IR) | ≤1.0 μA at 8.4 V - enables low-power standby operation without significant quiescent loss |
| Operating Temperature Range | –65°C to +175°C - qualified for aerospace, downhole, and military-grade thermal environments |
| Thermal Resistance (RθJC) | 40 °C/W junction-to-end-cap - allows direct thermal path to heatsink or PCB copper for sustained 1.5 W operation |
| Forward Voltage (VF) | ≤1.2 V at 200 mA - supports use as polarity-sensitive protection diode in bidirectional circuits |
Pinout & Package
Package: DO-213AB (Glass MELF), hermetically sealed, leadless surface-mount. Cathode indicated by single black band; anode is unmarked end. Tin-lead or RoHS-compliant matte-tin plating, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener regulation terminal | Must be biased positive relative to anode to enter reverse breakdown; defines regulated output node |
| Anode (unmarked end) | Reference/return terminal | Serves as circuit ground or common return path; connects to lower-potential rail during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and long-term parameter drift in harsh environments |
| Metallurgically enhanced contact design | Reduces interfacial thermal resistance and improves reliability under thermal cycling stress |
| Radiation hardness (per MicroNote 050) | Enables use in space-grade and nuclear instrumentation without derating for TID effects |
| Low reverse leakage (≤1.0 μA) | Minimizes standby current in battery-backed or ultra-low-power monitoring circuits |
| e3 RoHS-compliant variant | Meets environmental compliance requirements without sacrificing electrical or thermal performance |
Applications
| Avionics Power Monitoring | Downhole Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating reference voltage for analog-to-digital converters in flight control sensor modules exposed to wide thermal excursions. IC Role / Device Role / Timing Role: Precision voltage reference and overvoltage clamp protecting ADC input stages. Use Value: Stable 11 V reference across –65°C to +175°C ensures consistent conversion accuracy without calibration drift. |
Use Scenario: Providing stable bias voltage and transient suppression for piezoresistive pressure transducers in oil/gas well logging tools. IC Role / Device Role / Timing Role: Zener shunt regulator and ESD protection element in high-temperature analog front-ends. Use Value: Hermetic glass seal prevents parameter shift under 175°C ambient and high-humidity downhole conditions. |
| Military Radio RF Stage Biasing | Satellite Payload Voltage Clamping |
Use Scenario: Establishing fixed bias points for GaAs FET amplifiers in tactical HF/VHF transceivers operating under shock/vibration. IC Role / Device Role / Timing Role: Low-noise DC bias source and transient voltage suppressor for RF amplifier chains. Use Value: Low ZZT (8 Ω) maintains stable bias under RF-induced current ripple, minimizing AM noise. |
Use Scenario: Clamping bus voltage spikes induced by single-event transients (SETs) in LEO satellite power distribution networks. IC Role / Device Role / Timing Role: Radiation-hardened shunt limiter protecting downstream DC-DC converters and microcontrollers. Use Value: Inherent TID hardness per MicroNote 050 eliminates need for additional shielding or derating in orbit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N3021B (DO-13 axial) | Same electrical specs but axial leaded DO-13 package; higher thermal resistance (junction-to-ambient ≈ 120 °C/W on FR4) | Requires through-hole mounting; unsuitable for high-density SMT designs or automated placement | Select only when legacy board layout or manual repair constraints prohibit surface-mount components |
| MMBZ5232BS-7-F (Diodes Inc.) | Surface-mount SOD-123 package, 5.1 V nominal, 225 mW rating, ±5% tolerance - not voltage- or power-compatible | Limited to low-power signal-level regulation; cannot replace 1N3021BUR-1/TR in 11 V, 1.5 W applications | Consider only for cost-sensitive consumer-grade designs where 11 V/1.5 W capability is unnecessary |
Compared with 1N3021B and MMBZ5232BS-7-F, the 1N3021BUR-1/TR uniquely delivers 11 V Zener regulation at 1.5 W in a hermetic MELF package with radiation hardness and –65°C to +175°C operation - no alternative matches this combination of voltage, power, reliability, and environmental rating.
Availability
1N3021BUR-1/TR is available at Aetrix Electronics and suitable for avionics power monitoring, downhole sensor conditioning, and military radio biasing requiring stable component supply, extended temperature support, and radiation-tolerant construction.
Supply support for 1N3021BUR-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, radiation-hardened, and high-temperature analog and mixed-signal components.
The 1N3021BUR-1/TR belongs to Microsemi's legacy glass Zener diode family designed for mission-critical applications in aerospace, defense, and energy exploration where long-term parametric stability and environmental resilience are mandatory.
FAQ
What is the Zener voltage tolerance for 1N3021BUR-1/TR?
The 1N3021BUR-1/TR has a nominal Zener voltage of 11 V with a standard tolerance of ±5%, indicated by the "B" suffix in the part number. Tighter tolerances (±2%, ±1%) are available with suffixes "C" or "D", but the TR-suffixed production version uses the B-grade tolerance. This tolerance is specified at 25°C under thermal equilibrium conditions.
Is 1N3021BUR-1/TR compatible with lead-free reflow processes?
Yes, the 1N3021BUR-1/TR is RoHS-compliant (e3 suffix) and qualified for lead-free reflow soldering at 260°C for up to 10 seconds. Its glass MELF package and matte-tin plating meet MIL-STD-750 Method 2026 solderability requirements, ensuring reliable wetting and joint integrity without cracking or delamination.
Does 1N3021BUR-1/TR require heatsinking in typical PCB layouts?
The 1N3021BUR-1/TR achieves 1.5 W dissipation with a junction-to-end-cap thermal resistance of 40 °C/W. When mounted on FR4 with recommended footprint, its junction-to-ambient resistance rises to 120 °C/W. For continuous 1.5 W operation, direct thermal coupling to a metal heatsink or large copper pour is recommended to maintain junction temperature within –65°C to +175°C limits.
How does the radiation hardness of 1N3021BUR-1/TR compare to standard Zener diodes?
The 1N3021BUR-1/TR exhibits inherent radiation hardness per Microsemi MicroNote 050, enabling operation in total ionizing dose (TID) environments exceeding 100 krad(Si) without parameter degradation. Standard commercial Zeners lack this qualification and typically fail or drift significantly above 10 krad(Si), making 1N3021BUR-1/TR essential for satellite and nuclear instrumentation.
Can 1N3021BUR-1/TR be used in bidirectional protection configurations?
No - the 1N3021BUR-1/TR is a unidirectional Zener diode optimized for reverse-bias regulation. Its forward voltage is ≤1.2 V at 200 mA, but it lacks symmetrical breakdown characteristics. For bidirectional transient suppression, paired 1N3021BUR-1/TR devices (anode-to-anode or cathode-to-cathode) or purpose-built TVS arrays must be used instead of relying on a single device.
1N3021BUR-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):
- 11 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 8.4 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
1N3021BUR-1/TR FAQ
1.How can I place an order for 1N3021BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3021BUR-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 1N3021BUR-1/TR reliable?
The price and inventory of 1N3021BUR-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 1N3021BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N3021BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3021BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3021BUR-1/TR?
1N3021BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3021BUR-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 1N3021BUR-1/TR?
For technical support, including 1N3021BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3021BUR-1/TR requirements.
6.How does Aetrix verify that 1N3021BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N3021BUR-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 1N3021BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N3021BUR-1/TR?
All 1N3021BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N3021BUR-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 1N3021BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N3021BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N3021BUR-1/TR Tags
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MM5Z5V1ST1G
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