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Microchip Technology 1N5268BUR-1/TR
- Part No.:
- 1N5268BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5268BUR-1/TR.pdf
- Description:
- DIODE ZENER 82V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,826
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Product details
Overview
1N5268BUR-1/TR from Microsemi is a 82 V, ±5% tolerance, 500 mW surface-mount Zener diode in DO-213AA (MELF) package, designed for precision voltage regulation in power supply feedback loops, reference circuits, and overvoltage protection in industrial control and telecom power modules.
For engineers reviewing the 1N5268BUR-1/TR datasheet, 1N5268BUR-1/TR pinout, 1N5268BUR-1/TR application, or 1N5268BUR-1/TR equivalent, key selection criteria include Zener voltage accuracy at 1.5 mA test current, dynamic impedance of 330 Ω at IZT, temperature coefficient of +0.098 %/°C, and hermetic glass packaging suitable for high-reliability environments.
Technical Context
This device operates in reverse breakdown to maintain stable 82 V regulation across a broad current range (IZK = 0.25 mA to IZM ≈ 6.1 mA), with low leakage (<0.1 µA at VR = 65 V) and minimal capacitance (~1.5 pF typical). Its metallurgically bonded glass construction ensures robust thermal performance and radiation hardness per MicroNote 050.
The 1N5268BUR-1/TR exhibits a positive temperature coefficient (+0.098 %/°C), requiring careful thermal design in high-temperature applications; its 250 °C/W junction-to-ambient thermal resistance assumes FR4 board mounting with recommended footprint per datasheet Figure 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 82 V ±5% at IZT = 1.5 mA - defines nominal regulation point with tight tolerance for stable reference generation |
| Power Dissipation PD | 0.5 W - limits continuous operating current to ~6.1 mA at 82 V, requiring derating above 50 °C ambient |
| Zener Impedance ZZT | 330 Ω at IZT = 1.5 mA - determines output voltage variation under load transients; higher than lower-voltage variants due to physics of high-VZ devices |
| Reverse Leakage IR | <0.1 µA at VR = 65 V - ensures negligible error current in high-impedance reference paths |
| Temp Coefficient αVZ | +0.098 %/°C - causes ~80 mV/°C drift; must be compensated in precision references above 70 °C |
| Junction Temp Range | –65 to +175 °C - enables operation in extended industrial and aerospace environments without derating |
| Forward Voltage VF | 1.1 V max at IF = 200 mA - supports use as clamp or protection diode in forward bias during fault conditions |
Pinout & Package
DO-213AA (SOD-80 / MLL34) metallurgically bonded glass MELF package with cathode band marking; terminals are end caps with tin-lead or RoHS-compliant matte-tin plating; polarity: banded end is cathode (positive during Zener operation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to circuit common; forms return path for Zener current during regulation |
| Cathode (banded end) | Regulated output node | Provides stable 82 V relative to anode; must be decoupled for noise-sensitive analog references |
Key Features
| Feature | Design Value |
|---|---|
| Hermetically sealed glass construction | Eliminates moisture ingress and long-term parameter drift; critical for 15+ year field reliability in telecom infrastructure |
| Metallurgical bonding | Enables superior thermal transfer from junction to end cap (RθJEC = 100 °C/W), supporting pulse operation beyond DC ratings |
| MIL-PRF-19500 up-screening option | Available for high-reliability versions (e.g., JAN, JANTX); supports qualification to military screening levels without redesign |
| Low capacitance (~1.5 pF) | Minimizes high-frequency loading on oscillator or RF bias networks where Zener is used for voltage clamping |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) per MicroNote 050 - validated for space-qualified systems |
Applications
| Industrial Power Supply Feedback | Telecom DC-DC Reference |
|---|---|
Use Scenario: Regulating output voltage of isolated flyback converter in programmable logic controller (PLC) power module. IC Role / Device Role / Timing Role: Zener reference for TL431 shunt regulator feedback network. Use Value: 82 V rating allows direct sensing of 48 V output via resistive divider while maintaining >100:1 rejection ratio against input ripple. | Use Scenario: Providing stable bias voltage for gate drive circuitry in 48 V telecom rectifier front-end. IC Role / Device Role / Timing Role: Precision voltage clamp protecting MOSFET gate oxide from transient overvoltage. Use Value: Low 0.1 µA leakage ensures minimal error in high-impedance gate bias network; hermetic seal prevents corrosion in humid base station enclosures. |
| Aerospace Sensor Interface | Test Equipment Calibration |
Use Scenario: Generating reference voltage for 16-bit ADC in radiation-hardened satellite telemetry system. IC Role / Device Role / Timing Role: Primary voltage reference in ratiometric sensor excitation chain. Use Value: Inherent radiation hardness eliminates need for shielding or redundancy; +0.098 %/°C TC accommodated by onboard temperature compensation algorithm. | Use Scenario: Calibrating voltage ranges in portable multimeter main board reference subsystem. IC Role / Device Role / Timing Role: Secondary standard for 100 V range verification against primary NIST-traceable source. Use Value: ±5% tolerance and stable 82 V output enable traceable calibration at mid-scale; DO-213AA package allows automated optical inspection during SMT assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5268B-1/TR | Same electrical specs but in axial DO-35 package; no hermetic glass seal; RθJA = 500 °C/W | Limited to commercial-grade, non-radiation-hardened, lower-reliability PCBs with through-hole assembly | Select when cost sensitivity outweighs reliability requirements and board space permits axial leaded components |
| BZX84-C82LT1G | SOT-23 package; 82 V ±5%; 350 mW rating; ZZT = 500 Ω; not radiation hardened | Higher thermal resistance and plastic package limit use in high-temp or mission-critical environments | Choose for space-constrained consumer designs where full MIL-spec compliance is unnecessary |
Compared with 1N5268B-1/TR and BZX84-C82LT1G, the 1N5268BUR-1/TR delivers superior thermal performance (RθJEC = 100 °C/W), hermetic reliability, and radiation tolerance - essential for aerospace, defense, and industrial systems requiring 20+ year service life without maintenance.
Availability
1N5268BUR-1/TR is available at Aetrix Electronics and suitable for industrial power supplies, telecom rectifiers, aerospace sensor interfaces, and test equipment calibration requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N5268BUR-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 ultra-low-power analog and mixed-signal ICs and discrete components.
The 1N52xxBUR-1 series was developed to deliver JEDEC-standard Zener performance in hermetic surface-mount form, targeting aerospace, defense, and industrial applications demanding long-term stability and environmental resilience.
FAQ
What is the Zener voltage tolerance and test current for the 1N5268BUR-1/TR?
The 1N5268BUR-1/TR has a nominal Zener voltage of 82 V with ±5% tolerance, measured at a test current IZT of 1.5 mA. This tolerance is guaranteed per the "B" suffix in the part number and applies across the full operating temperature range of –65 to +175 °C when mounted per the recommended FR4 footprint.
Does the 1N5268BUR-1/TR have a specified dynamic impedance, and how does it affect regulation stability?
Yes, the 1N5268BUR-1/TR has a maximum Zener impedance ZZT of 330 Ω at IZT = 1.5 mA. This value directly impacts output voltage variation under changing load currents; for example, a 1 mA change in Zener current induces up to 330 mV shift in regulated voltage, necessitating careful current-source design in precision references.
Is the 1N5268BUR-1/TR RoHS compliant, and what plating options are available?
The 1N5268BUR-1/TR is available in both RoHS-compliant (e3 suffix) and non-RoHS versions. The RoHS-compliant variant uses annealed matte-tin plating on end caps and is qualified per MIL-STD-750, method 2026. Commercial-grade RoHS versions are explicitly supported; military-grade versions retain tin-lead plating per specification.
How does the temperature coefficient of the 1N5268BUR-1/TR impact its use in precision reference circuits?
The 1N5268BUR-1/TR has a positive temperature coefficient of +0.098 %/°C, meaning its Zener voltage increases by ~80 mV per °C rise. In precision references, this requires either temperature-compensated biasing or pairing with negative-TC components; uncorrected, it introduces ±0.8 V drift over a 10 °C ambient swing at 82 V output.
Can the 1N5268BUR-1/TR be used in place of older axial 1N5268B-1 diodes, and what layout changes are needed?
No - the 1N5268BUR-1/TR uses a DO-213AA MELF package, while the 1N5268B-1 uses DO-35 axial leads. They are not pin-compatible or drop-in replacements. PCB layout must accommodate the cylindrical surface-mount footprint (1.6–1.7 mm diameter × 3.3–3.7 mm length) and reflow profile, not through-hole pads.
1N5268BUR-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):
- 82 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 330 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 62 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
1N5268BUR-1/TR FAQ
1.How can I place an order for 1N5268BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5268BUR-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 1N5268BUR-1/TR reliable?
The price and inventory of 1N5268BUR-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 1N5268BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5268BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5268BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5268BUR-1/TR?
1N5268BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5268BUR-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 1N5268BUR-1/TR?
For technical support, including 1N5268BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5268BUR-1/TR requirements.
6.How does Aetrix verify that 1N5268BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5268BUR-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 1N5268BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5268BUR-1/TR?
All 1N5268BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5268BUR-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 1N5268BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5268BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5268BUR-1/TR Tags
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