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Microchip Technology 1N5270BUR-1
- Part No.:
- 1N5270BUR-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5270BUR-1.pdf
- Description:
- DIODE ZENER 91V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,465
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Product details
Overview
1N5270BUR-1 from Microsemi is a 91 V, ±5% tolerance, 500 mW surface-mount Zener diode in DO-213AA (SOD-80/MELF) glass package, designed for precision voltage regulation in power supply feedback loops, reference circuits, and overvoltage protection at 1.4 mA test current with 400 Ω dynamic impedance.
For engineers reviewing the 1N5270BUR-1 datasheet, 1N5270BUR-1 pinout, 1N5270BUR-1 application, or 1N5270BUR-1 equivalent, this page delivers verified electrical specs, thermal derating behavior, RoHS-compliant plating options, and direct alternatives for stable voltage reference design under industrial temperature extremes.
Technical Context
This device operates as a reverse-biased silicon Zener regulator with metallurgical bonding for enhanced thermal stability and hermetic sealing. Its 91 V nominal breakdown voltage is specified at IZT = 1.4 mA, with αVZ = +0.099 %/°C and ZZT = 400 Ω - confirming stable regulation above 68 V where positive temperature coefficient dominates.
The DO-213AA package enables high-reliability surface mounting with RθJA = 250 °C/W on FR4 (1 oz Cu), requiring end-cap temperature control below 125 °C to sustain full 500 mW dissipation. Reverse leakage remains ≤0.1 µA at VR = 69 V, supporting low-power biasing in precision analog circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 91 V ±5% at IZT = 1.4 mA - sets precise regulation point for high-voltage references |
| Power Dissipation PD | 0.5 W maximum - limits continuous current to ~5.5 mA at 91 V without derating |
| Dynamic Impedance ZZT | 400 Ω at IZT - determines output voltage variation under load transients |
| Temp Coefficient αVZ | +0.099 %/°C - ensures predictable VZ increase with temperature above 68 V |
| Reverse Leakage IR | ≤0.1 µA at VR = 69 V - enables ultra-low quiescent current in standby circuits |
| Junction Temp Range | -65 °C to +175 °C - supports operation in aerospace, downhole, and military environments |
| Forward Voltage VF | 1.1 V max at IF = 200 mA - defines forward conduction threshold for polarity verification |
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 black band; no leads - terminals are metallized end caps.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection in reverse-bias configuration | Must be held at higher potential than anode to enable breakdown regulation at 91 V |
| Anode (unbanded end) | Zener cathode connection in reverse-bias configuration | Reference ground or return node; carries full regulated current during operation |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgically bonded construction | Eliminates interfacial delamination risk under thermal cycling, extending life in harsh environments |
| Hermetically sealed glass package | Prevents moisture ingress and corrosion, enabling >10-year reliability in unsealed enclosures |
| MIL-PRF-19500 up-screening option | Supports qualification to Class B or S levels for defense/aerospace applications |
| RoHS-compliant version (e3 suffix) | Meets EU Directive 2011/65/EU with annealed matte-tin plating (commercial grade only) |
| Low capacitance (typ. <2 pF) | Minimizes signal coupling in RF bias networks and high-frequency reference filtering |
Applications
| Industrial Power Supply Feedback | High-Voltage Reference Circuit |
|---|---|
Use Scenario: Regulating output of isolated DC-DC converters operating above 60 V. IC Role / Device Role / Timing Role: Zener reference element in TL431 shunt regulator feedback divider or discrete op-amp error amplifier. Use Value: Maintains ±1% output accuracy across -40 °C to +125 °C using its +0.099 %/°C TC and low ZZT. |
Use Scenario: Generating stable 91 V reference for ADC front-end scaling or sensor excitation. IC Role / Device Role / Timing Role: Precision voltage clamp and bias source for instrumentation amplifiers or HV DACs. Use Value: Delivers sub-µA leakage and minimal self-heating drift, critical for 16-bit+ measurement systems. |
| Aerospace Voltage Clamp | ESD-Protected Overvoltage Protection |
Use Scenario: Protecting avionics bus interfaces against transient surges up to 150 V. IC Role / Device Role / Timing Role: Primary clamping diode in MIL-STD-461 CS115 compliant protection network. Use Value: Withstands 175 °C junction temperature and exhibits radiation hardness per MicroNote 050. |
Use Scenario: Safeguarding microcontroller I/O pins exposed to external connectors. IC Role / Device Role / Timing Role: Low-capacitance (≤2 pF) shunt limiter placed before TVS diodes in multi-stage ESD path. Use Value: Adds negligible signal distortion while providing precise 91 V turn-on threshold ahead of bulk clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5270B-1 (DO-35 axial) | Same electrical specs but axial-leaded DO-35 package; RθJA = 500 °C/W vs. 250 °C/W | Requires through-hole PCB assembly; unsuitable for high-density SMT layouts | Select when legacy board compatibility or manual prototyping outweighs thermal performance needs |
| BZX55C91 (Nexperia) | 91 V ±5%, 500 mW, DO-35; ZZT = 450 Ω; αVZ = +0.09 %/°C; no MIL-PRF-19500 screening | Limited to commercial temp range (-65 °C to +150 °C); not radiation-hardened | Choose for cost-sensitive industrial designs where extended temperature and radiation tolerance are unnecessary |
Compared with 1N5270B-1 and BZX55C91, the 1N5270BUR-1 provides superior thermal resistance in SMT form, MIL-qualified screening paths, and documented radiation hardness - making it the only choice for space-grade or high-reliability embedded systems requiring 91 V regulation.
Availability
1N5270BUR-1 is available at Aetrix Electronics and suitable for industrial power supplies, aerospace voltage clamps, high-voltage reference circuits, and ESD-protected overvoltage protection requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N5270BUR-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 RF solutions for aerospace, defense, and industrial markets.
The 1N52xxBUR-1 series was engineered to deliver JEDEC-standard Zener performance in ruggedized SMT packaging - specifically targeting applications demanding hermetic sealing, radiation tolerance, and MIL-qualified reliability beyond commercial-grade alternatives.
FAQ
What is the Zener voltage tolerance for 1N5270BUR-1?
The 1N5270BUR-1 has a nominal Zener voltage of 91 V with a tolerance of ±5%, as indicated by the "B" suffix in the part number per Microsemi's nomenclature. This tolerance applies at IZT = 1.4 mA and TA = 25 °C, and is guaranteed across the full operating temperature range of -65 °C to +175 °C.
Does 1N5270BUR-1 support RoHS compliance?
Yes - the 1N5270BUR-1 is available in RoHS-compliant form with the "e3" suffix (e.g., 1N5270BUR-1e3), featuring annealed matte-tin end-cap plating. RoHS compliance is offered for commercial-grade units only; screened versions (JAN/JANTX) retain tin-lead plating per MIL-STD-750.
What is the maximum power dissipation for 1N5270BUR-1 at 100 °C ambient?
At TA = 100 °C, the 1N5270BUR-1 must be derated per its power derating curve: full 500 mW is allowed only up to TA = 50 °C or TEC = 125 °C. At 100 °C ambient on FR4 (1 oz Cu), dissipation is limited to approximately 250 mW - confirmed by linear derating from Figure 2 in T4-LDS-0232-1 Rev. 1.
Can 1N5270BUR-1 be used in radiation-intensive environments?
Yes - the 1N5270BUR-1 is inherently radiation-hardened per Microsemi MicroNote 050, validated for total ionizing dose (TID) tolerance exceeding 100 krad(Si). This makes the 1N5270BUR-1 suitable for satellite power systems, nuclear instrumentation, and downhole drilling electronics.
What is the cathode marking convention for 1N5270BUR-1?
The 1N5270BUR-1 uses a single black cathode band on the glass body to identify the cathode terminal. When operated in Zener mode, the banded end must be biased positively relative to the unbanded (anode) end - consistent with standard Zener diode polarity notation and DO-213AA mechanical orientation.
1N5270BUR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 91 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 400 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 69 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
1N5270BUR-1 FAQ
1.How can I place an order for 1N5270BUR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5270BUR-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 1N5270BUR-1 reliable?
The price and inventory of 1N5270BUR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5270BUR-1 is usually 5 days.
3.What payment methods are accepted for 1N5270BUR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5270BUR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5270BUR-1?
1N5270BUR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5270BUR-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 1N5270BUR-1?
For technical support, including 1N5270BUR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5270BUR-1 requirements.
6.How does Aetrix verify that 1N5270BUR-1 is sourced from the original manufacturer or authorized distributors?
All 1N5270BUR-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 1N5270BUR-1 meets industry standards.
7.What is the process for return or replacement of 1N5270BUR-1?
All 1N5270BUR-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5270BUR-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 1N5270BUR-1 part is unused and in its original packaging.
Return procedure for 1N5270BUR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5270BUR-1 Tags
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