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Microchip Technology 1N5257BUR-1/TR
- Part No.:
- 1N5257BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5257BUR-1/TR.pdf
- Description:
- DIODE ZENER 33V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,067
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Product details
Overview
1N5257BUR-1/TR from Microsemi is a surface-mount 33 V, 500 mW Zener diode in DO-213AA (SOD-80/MELF) package with ±5% tolerance, 3.8 mA test current, and 58 Ω dynamic impedance at IZT, used for precision voltage regulation in power supply feedback loops and reference circuits.
For engineers reviewing the 1N5257BUR-1/TR datasheet, 1N5257BUR-1/TR pinout, 1N5257BUR-1/TR application, or 1N5257BUR-1/TR equivalent, key selection criteria include Zener voltage accuracy, temperature coefficient (+0.092 %/°C), low leakage (<0.1 µA @ 24 V), hermetic glass packaging, and RoHS-compliant commercial-grade availability.
Technical Context
This device operates as a reverse-biased voltage reference with a nominal Zener voltage of 33 V at 3.8 mA, exhibiting a positive temperature coefficient of +0.092 %/°C and dynamic impedance of 58 Ω - optimized for stable regulation across -65 °C to +175 °C junction temperature range.
Its metallurgically bonded glass construction ensures hermetic sealing and radiation hardness per MicroNote 050, while the DO-213AA package delivers minimal parasitic capacitance and ESD insensitivity per MIL-STD-750 Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 33 V ±5% at 3.8 mA - defines precise regulation point for feedback networks |
| Power Dissipation | 0.5 W - supports continuous operation up to 50 °C ambient on FR4 board |
| Dynamic Impedance ZZT | 58 Ω at IZT - determines output voltage stability under load variation |
| Reverse Leakage IR | <0.1 µA at 24 V - ensures negligible error current in high-impedance references |
| Temp. Coefficient αVZ | +0.092 %/°C - enables predictable drift compensation in wide-temperature designs |
| Junction Temp. Range | -65 °C to +175 °C - suitable for aerospace, industrial, and downhole applications |
| Forward Voltage VF | 1.1 V max @ 200 mA - allows use as clamp or protection diode in forward bias |
Pinout & Package
DO-213AA (SOD-80 / MELF) hermetically sealed glass package with axial symmetry and cathode band marking; terminals are solderable end caps with tin-lead or RoHS-compliant matte-tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection in reverse bias | Must be held positive relative to anode to enable breakdown regulation at 33 V |
| Anode (unbanded end) | Zener cathode connection in reverse bias | Reference ground or return node in shunt regulator configuration |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgically bonded glass construction | Enables hermetic sealing, radiation hardness, and long-term parameter stability |
| Low dynamic impedance (58 Ω) | Minimizes output voltage deviation under varying load currents in feedback paths |
| Minimal capacitance (typ. ~2 pF) | Preserves high-frequency response in RF biasing and fast-switching reference circuits |
| ESD insensitivity (MIL-STD-750 Method 1020) | Eliminates need for external ESD protection in handling and assembly |
| RoHS-compliant commercial version | Meets environmental compliance without derating or performance trade-offs |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
|
Use Scenario: Provides stable 33 V reference for optocoupler-based feedback in isolated DC-DC converters. IC Role / Device Role / Timing Role: Shunt voltage regulator defining secondary-side output voltage setpoint. Use Value: Tight 5% tolerance and low 58 Ω ZZT ensure <±1% output regulation across line/load/temperature. |
Use Scenario: Supplies excitation voltage to precision RTD or bridge sensor circuits in PLC analog input modules. IC Role / Device Role / Timing Role: Low-drift voltage reference source with predictable +0.092 %/°C TC for ratiometric measurement. Use Value: Hermetic DO-213AA package prevents parameter shift in humid industrial environments over 10+ year service life. |
| Aerospace Power Conditioning | Test & Measurement Equipment |
|
Use Scenario: Regulates auxiliary rail in satellite power management units exposed to total ionizing dose (TID). IC Role / Device Role / Timing Role: Radiation-hardened Zener reference for voltage supervision and sequencing logic. Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for shielding or derating in LEO missions. |
Use Scenario: Sets calibration reference in portable multimeters and benchtop power supplies requiring traceable stability. IC Role / Device Role / Timing Role: Primary shunt reference in precision voltage divider networks. Use Value: <0.1 µA leakage at 24 V prevents loading errors in high-impedance 16-bit ADC front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5257B-1TR | Same electrical specs but in axial DO-35 package; no hermetic glass seal | Suitable for cost-sensitive consumer PCBs where MELF mounting is impractical | Select when board space permits axial leads and radiation hardness is not required |
| BZX55C33-TR | 33 V ±5%, 500 mW, but in DO-35 with higher ZZT (70 Ω) and wider temp coefficient (±0.09 %/°C) | General-purpose regulation where tighter TC or lower ZZT is non-critical | Choose for legacy designs using standard DO-35 footprints and lower-cost sourcing |
Compared with 1N5257B-1TR and BZX55C33-TR, the 1N5257BUR-1/TR offers superior thermal stability, hermetic reliability, and lower dynamic impedance - critical for aerospace, industrial, and high-accuracy reference designs where long-term parameter drift must be minimized.
Availability
1N5257BUR-1/TR is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, and aerospace power conditioning requiring stable component supply with full traceability and long-lifecycle support.
Supply support for 1N5257BUR-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 analog, mixed-signal, and radiation-hardened components.
The 1N5257BUR-1/TR belongs to Microsemi's legacy 1N52xxBUR-1 Zener series designed for military, aerospace, and industrial applications demanding hermetic packaging, extended temperature operation, and proven radiation tolerance.
FAQ
What is the Zener voltage tolerance for 1N5257BUR-1/TR?
The 1N5257BUR-1/TR has a nominal Zener voltage of 33 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 3.8 mA test current and 25 °C ambient temperature, and remains stable across its full operating temperature range due to the device's metallurgical bond and hermetic packaging.
Is 1N5257BUR-1/TR RoHS compliant?
Yes, the 1N5257BUR-1/TR is RoHS compliant (designated by the "e3" suffix in full part marking), with annealed matte-tin plating on its end caps. RoHS compliance is available only on commercial-grade versions, and this part meets EU Directive 2011/65/EU requirements without performance derating or reliability impact.
What is the maximum power dissipation of 1N5257BUR-1/TR?
The 1N5257BUR-1/TR has a steady-state power dissipation rating of 0.5 W. This value is valid when mounted on an FR4 PCB with 1 oz copper and the recommended footprint, provided the end cap temperature stays below 125 °C or ambient temperature remains under 50 °C - otherwise, linear derating per Figure 2 in the datasheet applies.
How does the temperature coefficient affect 1N5257BUR-1/TR performance?
The 1N5257BUR-1/TR exhibits a positive temperature coefficient of +0.092 %/°C, meaning its Zener voltage increases predictably with rising temperature. This behavior is fully characterized from 25 °C to 125 °C and enables accurate drift compensation in precision reference designs, especially when paired with complementary TC components.
Can 1N5257BUR-1/TR be used in forward bias?
Yes, the 1N5257BUR-1/TR functions as a standard silicon diode in forward bias, with a maximum forward voltage of 1.1 V at 200 mA. This capability supports dual-use applications such as reverse-polarity protection or clamping, though its primary design intent and characterization are for reverse-bias Zener regulation at 33 V.
1N5257BUR-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):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 58 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 25 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
1N5257BUR-1/TR FAQ
1.How can I place an order for 1N5257BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5257BUR-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 1N5257BUR-1/TR reliable?
The price and inventory of 1N5257BUR-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 1N5257BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5257BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5257BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5257BUR-1/TR?
1N5257BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5257BUR-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 1N5257BUR-1/TR?
For technical support, including 1N5257BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5257BUR-1/TR requirements.
6.How does Aetrix verify that 1N5257BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5257BUR-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 1N5257BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5257BUR-1/TR?
All 1N5257BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5257BUR-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 1N5257BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5257BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5257BUR-1/TR Tags
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