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Microchip Technology 1N5266BUR-1
- Part No.:
- 1N5266BUR-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5266BUR-1.pdf
- Description:
- DIODE ZENER 68V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,775
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Product details
Overview
1N5266BUR-1 from Microsemi is a 68 V, 500 mW surface-mount Zener diode in DO-213AA (SOD-80/MELF) package with ±5% tolerance, 230 Ω dynamic impedance at 20 mA test current, and -65 °C to +175 °C junction temperature range. It provides precision voltage regulation in power supply feedback loops and reference circuits.
For engineers reviewing the 1N5266BUR-1 datasheet, 1N5266BUR-1 pinout, 1N5266BUR-1 application, or 1N5266BUR-1 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (100 °C/W junction-to-end-cap), low leakage (<0.1 µA at 49 V), radiation-hardened construction, and MIL-PRF-19500 upscreening capability.
Technical Context
This device operates as a reverse-biased voltage reference with a nominal Zener voltage of 68 V at 20 mA test current (IZT), exhibiting a positive temperature coefficient of +0.097 %/°C above 25 °C. Its metallurgically bonded glass construction ensures hermetic sealing and ESD immunity per MIL-STD-750 Method 1020.
The 1N5266BUR-1 delivers stable regulation across -65 °C to +175 °C, with maximum power dissipation of 0.5 W at end-cap temperature <125 °C. Its 100 °C/W junction-to-end-cap thermal resistance enables reliable operation on FR4 PCBs using standard footprint guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±5% at 20 mA - sets precise regulation point for feedback networks |
| Power Dissipation | 0.5 W - limits continuous current to ~7.4 mA at 68 V in steady state |
| Dynamic Impedance | 230 Ω at IZT - determines output voltage stability under load transients |
| Reverse Leakage | <0.1 µA at 49 V - ensures minimal error current in high-impedance reference paths |
| Junction Temp Range | -65 °C to +175 °C - supports operation in aerospace, downhole, and military environments |
| Thermal Resistance | 100 °C/W (junction-to-end-cap) - requires heatsinking or derating above 50 °C ambient |
| Temp Coefficient | +0.097 %/°C - predicts +66 mV/°C drift near 68 V, critical for temp-stable references |
Pinout & Package
DO-213AA (SOD-80/MELF) hermetically sealed glass package with tin-lead or RoHS-compliant matte-tin end-cap plating; cathode indicated by single band; polarity: banded end is cathode (positive during Zener operation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to circuit ground or low-side reference node; defines Zener breakdown polarity |
| Cathode | Zener regulation terminal | Banded end; connected to regulated voltage node; carries full Zener current in reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bonding | Eliminates wire bonds to improve reliability and thermal cycling endurance in harsh environments |
| MIL-PRF-19500 screening | Enables use in defense and space applications requiring extended reliability testing and lot traceability |
| Radiation hardness | Inherently radiation-tolerant per Microsemi MicroNote 050 - suitable for satellite and nuclear instrumentation |
| Low capacitance | Typical ~1.5 pF - preserves high-frequency response in RF bias and timing circuits |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in assembly |
Applications
| Power Supply Feedback | High-Voltage Reference |
|---|---|
Use Scenario: Regulating output voltage in isolated DC-DC converters using optocoupler feedback. IC Role / Device Role / Timing Role: Zener reference providing stable 68 V threshold to drive optocoupler LED in secondary-side feedback loop. Use Value: Enables tight output regulation (±1%) over line/load/temperature with no active components in feedback path. | Use Scenario: Generating precise bias voltage for photomultiplier tube (PMT) anode chains. IC Role / Device Role / Timing Role: High-stability voltage reference supplying graded potentials across PMT dynodes. Use Value: Maintains gain consistency across wide temperature ranges due to known +0.097 %/°C TC and low leakage. |
| Aerospace Sensor Conditioning | Industrial Overvoltage Protection |
Use Scenario: Providing reference voltage for analog front-ends in radiation-exposed satellite telemetry systems. IC Role / Device Role / Timing Role: Radiation-hardened Zener establishing calibration baseline for ADC input scaling. Use Value: Delivers metrology-grade stability without shielding or redundancy, validated per MicroNote 050. | Use Scenario: Clamping transient surges on 48 V industrial bus lines using series resistor + Zener topology. IC Role / Device Role / Timing Role: Fast-acting shunt protector limiting voltage to 68 V during lightning-induced spikes. Use Value: Survives repeated 100 ms surges up to 0.5 W without parameter shift, thanks to metallurgical bond integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5266B-1 | Same electrical specs but in axial DO-35 package; lacks MELF mechanical robustness and thermal performance | Suitable for prototyping or low-vibration PCBs where surface-mount constraints don't apply | Select 1N5266B-1 only when through-hole assembly is required and thermal cycling is not a concern |
| MMBZ5266B | Same 68 V/5% rating but SOT-23 package; higher dynamic impedance (300 Ω) and lower power (350 mW) | Used in space-constrained consumer electronics where 0.5 W dissipation is not needed | Choose MMBZ5266B only for cost-sensitive, low-power designs with adequate board-level heatsinking |
Compared with 1N5266B-1 and MMBZ5266B, the 1N5266BUR-1 offers superior thermal resistance (100 °C/W vs. >300 °C/W), radiation hardness, and mechanical reliability-making it the sole choice for mission-critical, high-reliability, or high-temperature deployments.
Availability
1N5266BUR-1 is available at Aetrix Electronics and suitable for aerospace power conditioning, industrial sensor reference design, and radiation-tolerant instrumentation requiring stable component supply across extended product lifecycles.
Supply support for 1N5266BUR-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, radiation-hardened, and aerospace-grade components.
The 1N5266BUR-1 belongs to Microsemi's legacy 1N52xxBUR-1 Zener family, engineered for precision voltage regulation in extreme-environment applications including defense electronics, satellite subsystems, and nuclear instrumentation.
FAQ
What is the Zener voltage tolerance of the 1N5266BUR-1?
The 1N5266BUR-1 has a nominal Zener voltage of 68 V with a guaranteed tolerance of ±5%, as indicated by the "B" suffix in the part number per Microsemi's nomenclature. This tolerance applies at 20 mA test current and 25 °C ambient, and is maintained across the full operating temperature range of -65 °C to +175 °C.
Does the 1N5266BUR-1 support MIL-PRF-19500 screening?
Yes, the 1N5266BUR-1 supports up-screening per MIL-PRF-19500 specifications, as confirmed in the official Microsemi datasheet T4-LDS-0232-1. Screening options are designated by reliability level prefixes (e.g., MQ, MX, MV, MSP) added before the base part number, enabling qualification for military and space applications.
What is the maximum reverse leakage current for the 1N5266BUR-1?
The maximum reverse leakage current for the 1N5266BUR-1 is 0.1 µA when tested at 49 V (75% of nominal 68 V), per the Electrical Characteristics table on page 3 of the datasheet. This ultra-low leakage ensures minimal error contribution in high-impedance reference circuits and precision analog systems.
Is the 1N5266BUR-1 RoHS compliant?
Yes, RoHS-compliant versions of the 1N5266BUR-1 are available for commercial-grade use only, identified by the "e3" suffix (e.g., 1N5266BUR-1e3). The RoHS version uses annealed matte-tin plating on end caps and meets lead-free soldering requirements per JEDEC J-STD-020.
What package type does the 1N5266BUR-1 use?
The 1N5266BUR-1 uses the DO-213AA package, also known as SOD-80 or MELF (Metal Electrode Leadless Face), a hermetically sealed glass cylindrical surface-mount package with metallurgically bonded internal structure and cathode band marking.
1N5266BUR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 68 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 230 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 52 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N5266BUR-1 FAQ
1.How can I place an order for 1N5266BUR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5266BUR-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 1N5266BUR-1 reliable?
The price and inventory of 1N5266BUR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5266BUR-1 is usually 5 days.
3.What payment methods are accepted for 1N5266BUR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5266BUR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5266BUR-1?
1N5266BUR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5266BUR-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 1N5266BUR-1?
For technical support, including 1N5266BUR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5266BUR-1 requirements.
6.How does Aetrix verify that 1N5266BUR-1 is sourced from the original manufacturer or authorized distributors?
All 1N5266BUR-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 1N5266BUR-1 meets industry standards.
7.What is the process for return or replacement of 1N5266BUR-1?
All 1N5266BUR-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5266BUR-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 1N5266BUR-1 part is unused and in its original packaging.
Return procedure for 1N5266BUR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5266BUR-1 Tags
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