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Microchip Technology 1N5257BUR-1
- Part No.:
- 1N5257BUR-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5257BUR-1.pdf
- Description:
- DIODE ZENER 33V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,097
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Product details
Overview
1N5257BUR-1 from Microsemi is a 33 V, 5% tolerance, 500 mW surface-mount Zener diode in a DO-213AA (SOD80/MLL34) MELF glass package, designed for precision voltage regulation in space-constrained industrial and aerospace power supply circuits.
For engineers reviewing the 1N5257BUR-1 datasheet, 1N5257BUR-1 pinout, 1N5257BUR-1 application, or 1N5257BUR-1 equivalent, key selection criteria include Zener voltage temperature coefficient (+0.092 %/°C), dynamic impedance (58 Ω @ 3.8 mA), reverse leakage (0.1 µA @ 24 V), and hermetic metallurgical bonding for radiation-hardened operation.
Technical Context
This Zener regulator operates in reverse breakdown with a nominal 33 V Zener voltage at 3.8 mA test current, exhibiting low capacitance and minimal ESD sensitivity per MIL-STD-750 Method 1020. Its metallurgically bonded glass construction ensures stable performance across -65 °C to +175 °C junction temperature range.
The device delivers regulated voltage over broad current (0.25 mA to 3.8 mA) and temperature ranges, with thermal resistance of 100 °C/W junction-to-end-cap and 250 °C/W junction-to-ambient on FR4 board - enabling reliable operation in high-reliability analog reference and biasing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 33 V ±5% at 3.8 mA - sets precise DC reference level for feedback loops and voltage clamping |
| Power Dissipation | 0.5 W steady-state - supports continuous regulation without forced cooling in compact layouts |
| Zener Impedance ZZT | 58 Ω @ IZT = 3.8 mA - determines output voltage stability under load transients |
| Temp. Coefficient αVZ | +0.092 %/°C - enables predictable drift compensation in wide-temperature-range designs |
| Reverse Leakage IR | 0.1 µA @ 24 V - ensures negligible error current in high-impedance reference networks |
| Junction Temp. Range | -65 °C to +175 °C - qualifies for extended-temperature industrial, avionics, and downhole electronics |
| Package | DO-213AA (SOD80/MLL34) MELF - provides hermetic sealing and radiation hardness per MicroNote 050 |
Pinout & Package
DO-213AA (SOD80/MLL34) MELF glass package with metallurgically bonded end caps; cathode indicated by single band; RoHS-compliant matte-tin plating; weight 0.04 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node during Zener operation; carries forward current up to 200 mA |
| Cathode | Regulated output terminal | Banded end; held at stable 33 V relative to anode during reverse breakdown; referenced to system ground in shunt regulators |
Key Features
| Feature | Design Value |
|---|---|
| Hermetically sealed glass construction | Prevents moisture ingress and long-term parameter drift in harsh environments |
| Metallurgical bond interface | Ensures mechanical robustness and thermal cycling reliability for aerospace-grade applications |
| Radiation hardness | Inherently qualified per Microsemi MicroNote 050 for total ionizing dose (TID) resilience |
| Low capacitance | Typical <2 pF - preserves signal integrity in RF-coupled bias networks and fast-switching references |
| ESD insensitivity | Non-sensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling |
Applications
| Industrial Power Supply Reference | Aerospace Voltage Clamp |
|---|---|
Use Scenario: Stable 33 V reference in isolated DC-DC converter feedback loop operating from -40 °C to +85 °C ambient. IC Role / Device Role / Timing Role: Shunt voltage regulator providing precision bias for optocoupler-based error amplifier. Use Value: 58 Ω dynamic impedance and +0.092 %/°C tempco enable ±1.5% output regulation over full temperature range without trimming. | Use Scenario: Overvoltage clamp protecting 28 V avionics bus from transient spikes during load dump events. IC Role / Device Role / Timing Role: Fast-acting Zener clamp absorbing surge energy while maintaining bus integrity. Use Value: Hermetic DO-213AA package and radiation hardness ensure operational reliability in flight-critical systems. |
| Downhole Sensor Biasing | Medical Instrument Calibration |
Use Scenario: Providing stable bias voltage for MEMS pressure sensor front-end in oil/gas wellhead electronics at 150 °C junction temperature. IC Role / Device Role / Timing Role: High-temperature Zener reference source for ADC input scaling network. Use Value: -65 °C to +175 °C rating and 100 °C/W RθJEC allow direct mounting to heat-sinking end cap for thermal management. | Use Scenario: Precision voltage reference in portable ECG amplifier calibration circuit requiring low-drift, low-noise DC offset. IC Role / Device Role / Timing Role: Low-leakage (0.1 µA) shunt regulator establishing accurate 33 V reference for DAC output scaling. Use Value: Minimal capacitance (<2 pF) prevents phase shift in high-frequency calibration signal paths. |
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-1 | Same 33 V, 5% tolerance, but in axial DO-35 package; no metallurgical bond; non-hermetic | Limited to commercial-grade PCB-mounted applications; unsuitable for high-reliability or radiation-exposed use | Select when cost and through-hole assembly dominate; avoid where hermeticity or TID resilience required |
| MMBZ5257B | SOT-23 package; same 33 V, 5%; higher dynamic impedance (70 Ω); max 350 mW dissipation | Higher board density but reduced power handling; not qualified to MIL-PRF-19500 screening levels | Select for space-constrained consumer designs; avoid in aerospace or extended-temp industrial systems |
Compared with 1N5257B-1 and MMBZ5257B, the 1N5257BUR-1 uniquely combines hermetic DO-213AA packaging, metallurgical bonding, radiation hardness, and 0.5 W power rating - making it the only choice for mission-critical analog references where long-term stability and environmental resilience are mandatory.
Availability
1N5257BUR-1 is available at Aetrix Electronics and suitable for industrial power supplies, aerospace voltage clamps, downhole sensor biasing, and medical instrument calibration requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N5257BUR-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 1N52xxBUR-1 series was developed to deliver JEDEC-standard Zener regulation in hermetic surface-mount form, targeting defense, space, and critical infrastructure applications demanding long-term parametric stability.
FAQ
What is the Zener voltage tolerance for 1N5257BUR-1?
The 1N5257BUR-1 has a nominal Zener voltage of 33 V with a tolerance of ±5%, as indicated by the "B" suffix in the part number per Microsemi's nomenclature. This tolerance applies at 25 °C with 3.8 mA test current and remains stable across its rated junction temperature range of -65 °C to +175 °C due to its metallurgically bonded construction.
Does 1N5257BUR-1 meet MIL-PRF-19500 requirements?
Yes, the 1N5257BUR-1 is available with up-screening per MIL-PRF-19500 - specifically for the JAN, JANTX, JANTXV, and JANS reliability levels. The "UR" in the part number denotes the metallurgically bonded surface-mount configuration, and screening options are defined in the part nomenclature table; commercial-grade units (blank reliability level) are RoHS-compliant.
What is the maximum reverse leakage current for 1N5257BUR-1?
The maximum reverse leakage current for 1N5257BUR-1 is 0.1 µA measured at 24 V reverse voltage (VR), per the Electrical Characteristics table on page 3 of the T4-LDS-0232-1 datasheet. This ultra-low leakage supports high-impedance reference networks in precision analog circuits without introducing measurable error current.
Can 1N5257BUR-1 be used in radiation-intensive environments?
Yes, the 1N5257BUR-1 is inherently radiation-hardened per Microsemi MicroNote 050, verified through total ionizing dose (TID) testing. Its hermetically sealed DO-213AA glass package and internal metallurgical bond contribute to this resilience, making it suitable for satellite, avionics, and nuclear instrumentation applications where radiation-induced parameter shift must be minimized.
What is the thermal resistance specification for 1N5257BUR-1?
The 1N5257BUR-1 has a junction-to-end-cap thermal resistance (RθJEC) of 100 °C/W and a junction-to-ambient resistance (RθJA) of 250 °C/W when mounted on an FR4 board with 1 oz copper and the recommended footprint. These values enable thermal design margin for continuous 0.5 W operation at end-cap temperatures below 125 °C or ambient temperatures below 50 °C.
1N5257BUR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- 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 FAQ
1.How can I place an order for 1N5257BUR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5257BUR-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 1N5257BUR-1 reliable?
The price and inventory of 1N5257BUR-1 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 is usually 5 days.
3.What payment methods are accepted for 1N5257BUR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5257BUR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5257BUR-1?
1N5257BUR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5257BUR-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 1N5257BUR-1?
For technical support, including 1N5257BUR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5257BUR-1 requirements.
6.How does Aetrix verify that 1N5257BUR-1 is sourced from the original manufacturer or authorized distributors?
All 1N5257BUR-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 1N5257BUR-1 meets industry standards.
7.What is the process for return or replacement of 1N5257BUR-1?
All 1N5257BUR-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5257BUR-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 1N5257BUR-1 part is unused and in its original packaging.
Return procedure for 1N5257BUR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5257BUR-1 Tags
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