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Microchip Technology 1N5266BUR-1/TR
- Part No.:
- 1N5266BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5266BUR-1/TR.pdf
- Description:
- DIODE ZENER 68V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,926
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Product details
Overview
1N5266BUR-1/TR from Microsemi is a 68 V, 5% tolerance, 500 mW surface-mount Zener diode in DO-213AA (SOD-80/MELF) package, designed for precision voltage regulation in power supply feedback loops, reference circuits, and overvoltage protection. It delivers stable regulation at 20 mA test current with 230 Ω dynamic impedance and operates across –65 °C to +175 °C junction temperature.
For engineers reviewing the 1N5266BUR-1/TR datasheet, 1N5266BUR-1/TR pinout, 1N5266BUR-1/TR application, or 1N5266BUR-1/TR equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (100 °C/W junction-to-end-cap), low leakage (<0.1 µA @ 49 V), radiation hardness, and RoHS-compliant commercial-grade availability.
Technical Context
This device implements a metallurgically bonded glass-junction Zener structure optimized for stable breakdown behavior under DC bias. Its 68 V nominal Zener voltage exhibits a +0.097 %/°C temperature coefficient above 25 °C, requiring derating above 50 °C ambient or 125 °C end-cap temperature per MIL-PRF-19500-aligned screening options.
It operates with minimal capacitance (typical ~1.5 pF at 68 V), enabling use in high-frequency reference and noise-sensitive analog circuits. The hermetically sealed DO-213AA package ensures long-term stability and ESD insensitivity per MIL-STD-750 Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 68 V ±5% at 20 mA - defines precise regulation point for feedback networks |
| Power Dissipation PD | 0.5 W - limits continuous DC power handling on FR4 PCB with recommended footprint |
| Dynamic Impedance ZZT | 230 Ω at IZT = 20 mA - determines output voltage variation under load transients |
| Reverse Leakage IR | <0.1 µA at 49 V - ensures negligible error current in high-impedance reference paths |
| Junction Temp Range | –65 °C to +175 °C - supports operation in aerospace, industrial, and downhole environments |
| Temp Coefficient αVZ | +0.097 %/°C - enables predictable drift compensation in temperature-stable references |
| Forward Voltage VF | ≤1.1 V at 200 mA - allows use as clamp or protection diode in forward bias |
Pinout & Package
DO-213AA (SOD-80 / MELF) hermetically sealed glass package with tin-lead or RoHS-compliant matte-tin end-cap plating. Cathode identified by single band; banded end is positive during Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection | Connected to regulated output node; reverse-biased for voltage reference function |
| Anode (unbanded end) | Zener cathode connection | Connected to ground or lower-potential rail; completes Zener conduction path |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Eliminates interfacial delamination risk under thermal cycling and radiation exposure |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050 - suitable for space-qualified and nuclear instrumentation |
| Low capacitance (~1.5 pF) | Minimizes high-frequency loading in oscillator and RF detector reference nodes |
| MIL-PRF-19500 up-screening option | Enables qualification for military/aerospace applications via suffix-defined reliability levels (MQ/MX/MV/MSP) |
| RoHS-compliant commercial version | e3 suffix indicates lead-free termination compatible with Pb-free reflow profiles (260 °C, 10 s) |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters using optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference element setting precise 68 V threshold for TL431-like shunt regulator circuitry. Use Value: Tight 5% tolerance and low dynamic impedance ensure <±1% output regulation across line/load/temperature. | Use Scenario: Provides stable excitation voltage for bridge-based pressure transducers in factory automation systems. IC Role / Device Role / Timing Role: Precision voltage reference source for ratiometric ADC front-end biasing. Use Value: Low leakage (<0.1 µA) prevents measurement offset drift in high-impedance sensor interfaces. |
| Aerospace Voltage Clamp | Overvoltage Protection Circuit |
Use Scenario: Protects avionics data bus receivers from transient surges exceeding 68 V in MIL-STD-704 compliant systems. IC Role / Device Role / Timing Role: Fast-response Zener clamp absorbing energy during ESD or lightning-induced spikes. Use Value: Radiation-hardened construction ensures reliability in high-altitude flight and orbital environments. | Use Scenario: Safeguards microcontroller I/O pins against accidental 72 V battery connection in automotive body control modules. IC Role / Device Role / Timing Role: Standby-mode overvoltage limiter activated only during fault conditions. Use Value: Hermetic DO-213AA package prevents moisture ingress and parametric shift over 15+ year service life. |
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/TR | Same 68 V, 5% spec but in axial DO-35 package; higher RθJA (300 °C/W vs. 250 °C/W) | Lacks MELF's vibration resistance and thermal cycling robustness; unsuitable for high-reliability SMT assemblies | Select when legacy through-hole assembly or manual prototyping is required |
| BZX55C68-TR | 68 V, 5% Zener in DO-35; 500 mW rating but no MIL-PRF-19500 screening or radiation hardness data | Commercial-only qualification; not validated for aerospace or nuclear environments | Select for cost-sensitive consumer electronics where radiation tolerance is unnecessary |
Compared with 1N5266B-1/TR and BZX55C68-TR, the 1N5266BUR-1/TR uniquely combines surface-mount MELF packaging, metallurgical bonding, documented radiation hardness, and MIL-PRF-19500 up-screening capability - making it the only choice for mission-critical SMT voltage references.
Availability
1N5266BUR-1/TR is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, aerospace clamping circuits, and overvoltage protection systems requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for 1N5266BUR-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 high-voltage analog components for aerospace, defense, and industrial markets.
The 1N52xxBUR-1 series was developed to deliver JEDEC-standard Zener performance in ruggedized surface-mount MELF packages, targeting applications demanding long-term parametric stability under extreme thermal, mechanical, and radiation stress.
FAQ
What is the Zener voltage tolerance for 1N5266BUR-1/TR?
The 1N5266BUR-1/TR has a nominal Zener voltage of 68 V with a guaranteed tolerance of ±5%, indicated by the "B" suffix in the part number per Microsemi's nomenclature. This tolerance is verified at 20 mA test current and 25 °C ambient, and remains stable across its full operating temperature range due to its metallurgically bonded construction.
Is 1N5266BUR-1/TR RoHS compliant?
Yes, the 1N5266BUR-1/TR is RoHS compliant (e3 suffix), with annealed matte-tin end-cap plating suitable for lead-free reflow soldering at 260 °C for 10 seconds. RoHS compliance applies only to the commercial-grade version; military-screened variants (MQ/MX/MV/MSP) retain tin-lead terminations unless otherwise specified.
What is the maximum reverse leakage current for 1N5266BUR-1/TR?
The maximum reverse leakage current for 1N5266BUR-1/TR is 0.1 µA at 49 V (73% of VZ). This ultra-low leakage is critical for high-impedance reference circuits and ensures minimal error contribution in precision analog designs, especially at elevated temperatures where leakage typically increases.
Can 1N5266BUR-1/TR be used in radiation-intensive environments?
Yes, the 1N5266BUR-1/TR is inherently radiation hard per Microsemi MicroNote 050, validated for total ionizing dose (TID) resilience without parameter degradation. Its metallurgically bonded glass structure and hermetic DO-213AA package make it suitable for satellite power systems, nuclear instrumentation, and high-altitude avionics where radiation-induced failure must be avoided.
What is the thermal resistance of 1N5266BUR-1/TR, and how does it affect layout?
The 1N5266BUR-1/TR has a junction-to-end-cap thermal resistance (RθJEC) of 100 °C/W and junction-to-ambient (RθJA) of 250 °C/W on FR4 with 1 oz Cu and recommended footprint. To maintain safe operation below 125 °C end-cap temperature, PCB copper area around end caps must follow Microsemi's pad layout (5.08 mm × 1.40 mm), and power dissipation must be derated above 50 °C ambient.
1N5266BUR-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Tape & Reel (TR)
- 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/TR FAQ
1.How can I place an order for 1N5266BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5266BUR-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 1N5266BUR-1/TR reliable?
The price and inventory of 1N5266BUR-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 1N5266BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5266BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5266BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5266BUR-1/TR?
1N5266BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5266BUR-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 1N5266BUR-1/TR?
For technical support, including 1N5266BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5266BUR-1/TR requirements.
6.How does Aetrix verify that 1N5266BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5266BUR-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 1N5266BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5266BUR-1/TR?
All 1N5266BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5266BUR-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 1N5266BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5266BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5266BUR-1/TR Tags
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MM5Z5V1ST1G
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