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Microchip Technology 1N5251BUR-1
- Part No.:
- 1N5251BUR-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5251BUR-1.pdf
- Description:
- DIODE ZENER 22V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,397
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Product details
Overview
1N5251BUR-1 from Microsemi is a hermetically sealed, metallurgically bonded glass MELF Zener diode rated for 500 mW power dissipation, with a nominal Zener voltage of 22 V at 5.6 mA test current, ±5% tolerance (B-grade), and +0.087 %/°C temperature coefficient. It operates across –65 °C to +175 °C junction temperature and serves as a precision voltage reference or shunt regulator in low-power analog circuits.
For engineers reviewing the 1N5251BUR-1 datasheet, 1N5251BUR-1 pinout, 1N5251BUR-1 application, or 1N5251BUR-1 equivalent, key selection criteria include its DO-213AA (SOD80) package, low dynamic impedance (29 Ω at IZT), minimal reverse leakage (≤0.1 µA at 16.2 V), and radiation-hardened construction per MicroNote 050.
Technical Context
This device functions as a two-terminal shunt voltage regulator, operating in reverse breakdown with a well-defined Zener knee at IZK = 0.25 mA and full regulation at IZT = 5.6 mA. Its metallurgical bond ensures stable thermal performance and long-term reliability under thermal cycling.
The 1N5251BUR-1 exhibits a positive temperature coefficient (+0.087 %/°C), making it suitable for temperature-compensated references when paired with negative-TC components. Its 600 Ω maximum Zener impedance at IZK and 29 Ω at IZT support stable regulation across varying load currents within its 0.5 W power limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 22 V ±5% at 5.6 mA - defines precise regulation point for biasing or reference generation |
| Power Dissipation PD | 0.5 W - limits continuous shunt current to ~22.7 mA at 22 V without derating |
| Zener Impedance ZZT | 29 Ω at IZT - ensures <1% output variation over ±5 mA load change near regulation point |
| Reverse Leakage IR | ≤0.1 µA at 16.2 V - enables high-impedance sensing and low-quiescent-current designs |
| Temp. Coefficient αVZ | +0.087 %/°C - supports predictable drift compensation in wide-temperature industrial environments |
| Junction Temp. Range | –65 °C to +175 °C - qualified for aerospace, downhole, and high-reliability embedded systems |
| Package Type | DO-213AA (SOD80/MELF) - hermetic glass body with end-cap terminations for moisture resistance and thermal stability |
Pinout & Package
DO-213AA (SOD80) MELF glass package: cylindrical hermetically sealed body with tin-lead or RoHS-compliant matte-tin plated end caps; cathode indicated by single band; polarity: banded end is cathode (positive terminal during Zener operation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference Ground Node | Connected to circuit ground or lowest potential node; carries full Zener current during regulation |
| Cathode (banded end) | Regulated Output Node | Provides stable 22 V reference relative to anode; must be decoupled for noise-sensitive applications |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic Glass Encapsulation | Prevents moisture ingress and parameter drift over 20+ year field life in harsh environments |
| Metallurgical Bond Construction | Eliminates wire bonds and interfacial delamination risks-critical for shock/vibration resilience |
| Radiation Hardness | Inherently hardened per Microsemi MicroNote 050-no additional screening required for TID up to 100 krad(Si) |
| MIL-PRF-19500 Screening Option | Available with MQ/MX/MV/MSP reliability levels for space, defense, and nuclear instrumentation |
| Low Capacitance | Typical CJ ≈ 4 pF (per Figure 3) - preserves high-frequency signal integrity in RF bias networks |
Applications
| Industrial Sensor Signal Conditioning | Aerospace Power Supply Monitoring |
|---|---|
|
Use Scenario: Stabilizing excitation voltage for strain gauge bridges in factory-floor pressure transmitters. IC Role / Device Role / Timing Role: Shunt voltage reference providing 22 V bias with <±0.1% drift over –40 °C to +85 °C ambient. Use Value: Enables 16-bit ADC linearity by eliminating supply-induced gain error; leverages +0.087 %/°C TC for passive compensation against op-amp drift. |
Use Scenario: Monitoring 28 V aircraft bus voltage via resistive divider into comparator input. IC Role / Device Role / Timing Role: Precision 22 V Zener clamp protecting comparator input from transients while setting trip threshold. Use Value: Survives MIL-STD-704 surges due to hermetic DO-213AA package and 175 °C junction rating; ESD immune per MIL-STD-750 Method 1020. |
| Downhole Oilfield Instrumentation | Medical Imaging Bias Supplies |
|
Use Scenario: Generating stable gate bias for high-side MOSFETs in 175 °C logging tool power stages. IC Role / Device Role / Timing Role: High-temperature Zener reference maintaining regulation at 150 °C case temperature. Use Value: Maintains 22 V regulation with <5% deviation at 150 °C-enables reliable switching where silicon regulators fail. |
Use Scenario: Providing calibrated high-voltage bias (e.g., 22 V) for photomultiplier tube dynode chains in PET scanners. IC Role / Device Role / Timing Role: Low-noise, low-drift shunt reference ensuring consistent electron multiplication gain. Use Value: Sub-0.1 µA leakage prevents dark current injection; radiation hardness avoids parametric shift during repeated X-ray exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5251B-1 (DO-35) | Axial-leaded DO-35 package; identical electrical specs but higher RθJA (300 °C/W vs. 250 °C/W); no MIL-PRF-19500 screening path | Suitable for prototyping or through-hole PCBs; not recommended for high-density SMT or high-reliability screening programs | Select only if board assembly requires axial leads or legacy footprint compatibility |
| BZX55C22 (Nexperia) | Plastic DO-35 package; ±5% tolerance; 500 mW rating; 30 Ω ZZT; no radiation hardness or MIL screening options | Cost-optimized commercial use; lacks hermeticity and extended temperature capability (–65 °C to +150 °C max) | Acceptable for consumer-grade power supplies where radiation, moisture, or extreme temperature are non-critical |
Compared with 1N5251B-1 and BZX55C22, the 1N5251BUR-1 delivers superior thermal resistance, hermetic reliability, and radiation tolerance-making it the only choice for mission-critical SMT applications above 125 °C or in regulated aerospace/industrial systems.
Availability
1N5251BUR-1 is available at Aetrix Electronics and suitable for industrial sensor conditioning, aerospace power monitoring, downhole instrumentation, medical imaging biasing, and high-reliability embedded systems requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N5251BUR-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 high-performance analog and mixed-signal components.
The 1N5251BUR-1 belongs to Microsemi's legacy 1N52xxBUR-1 Zener series-designed specifically for surface-mount, high-stability voltage regulation in aerospace, defense, oilfield, and medical systems demanding hermetic packaging and extended temperature operation.
FAQ
What is the Zener voltage tolerance for 1N5251BUR-1?
The 1N5251BUR-1 has a nominal Zener voltage of 22 V with a ±5% tolerance, indicated by the "B" suffix in the part number per Microsemi's nomenclature. This means the actual VZ falls between 20.9 V and 23.1 V when measured at IZT = 5.6 mA and TA = 25 °C. Tighter tolerances (±2%, ±1%) are available under different suffixes (C/D), but the 1N5251BUR-1 is specifically the 5% grade.
Does 1N5251BUR-1 support MIL-PRF-19500 screening?
Yes, the 1N5251BUR-1 supports MIL-PRF-19500 up-screening through Microsemi's reliability level coding: MQ (JAN), MX (JANTX), MV (JANTXV), or MSP (JANS). The base commercial part (no prefix) can be ordered with these screening levels-enabling qualification for military, space, and nuclear applications. Full test documentation and lot traceability are provided per screening level requirements.
What is the maximum steady-state power dissipation for 1N5251BUR-1?
The 1N5251BUR-1 has a rated steady-state power dissipation of 0.5 W. This applies when the end cap temperature (TEC) remains below 125 °C or ambient temperature (TA) stays under 50 °C on a standard FR4 board with 1 oz copper and Microsemi's recommended footprint. Derating is required above those temperatures per the curve in Figure 2 of the datasheet.
Is 1N5251BUR-1 RoHS compliant?
Yes, RoHS-compliant versions of 1N5251BUR-1 are available for commercial-grade use only, marked with the "e3" suffix (e.g., 1N5251BUR-1e3). These use annealed matte-tin plating instead of tin-lead. Note that RoHS compliance is not offered for screened (MQ/MX/MV/MSP) versions, which retain tin-lead terminations to meet MIL-STD-202 and MIL-STD-750 solderability requirements.
How does the temperature coefficient of 1N5251BUR-1 affect its regulation accuracy?
The 1N5251BUR-1 has a temperature coefficient of +0.087 %/°C, meaning its Zener voltage increases by approximately 19.1 mV per °C rise from 25 °C. Over a –55 °C to +125 °C range, this results in a total VZ shift of roughly ±1.3 V. Designers use this predictable drift for passive compensation-e.g., pairing with negative-TC components-to achieve net zero drift in precision references.
1N5251BUR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 29 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 17 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
1N5251BUR-1 FAQ
1.How can I place an order for 1N5251BUR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5251BUR-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 1N5251BUR-1 reliable?
The price and inventory of 1N5251BUR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5251BUR-1 is usually 5 days.
3.What payment methods are accepted for 1N5251BUR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5251BUR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5251BUR-1?
1N5251BUR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5251BUR-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 1N5251BUR-1?
For technical support, including 1N5251BUR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5251BUR-1 requirements.
6.How does Aetrix verify that 1N5251BUR-1 is sourced from the original manufacturer or authorized distributors?
All 1N5251BUR-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 1N5251BUR-1 meets industry standards.
7.What is the process for return or replacement of 1N5251BUR-1?
All 1N5251BUR-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5251BUR-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 1N5251BUR-1 part is unused and in its original packaging.
Return procedure for 1N5251BUR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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