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Microchip Technology 1N5254BUR-1
- Part No.:
- 1N5254BUR-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5254BUR-1.pdf
- Description:
- DIODE ZENER 27V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,172
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Product details
Overview
1N5254BUR-1 from Microsemi is a 27 V, 500 mW surface-mount Zener diode in DO-213AA (SOD80/MLL34) MELF package with ±5% tolerance, 41 Ω dynamic impedance at 4.6 mA test current, and -65 °C to +175 °C operating temperature range, used for precision voltage regulation in power supply feedback loops and reference circuits.
For engineers reviewing the 1N5254BUR-1 datasheet, 1N5254BUR-1 pinout, 1N5254BUR-1 application, or 1N5254BUR-1 equivalent, this page delivers verified electrical specs, thermal derating behavior, RoHS-compliant packaging details, and direct alternatives for voltage reference design validation.
Technical Context
This device operates as a reverse-biased silicon Zener regulator, maintaining stable 27 V output across 0.25 mA to 4.6 mA nominal regulation current (IZK to IZT), with low 0.1 µA leakage at 20 V reverse bias and inherent radiation hardness per MicroNote 050.
Its metallurgically bonded glass construction enables hermetic sealing and high reliability in harsh environments, while the DO-213AA package supports automated SMT placement and provides 100 °C/W junction-to-end-cap thermal resistance when mounted on FR4 with recommended footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V at 4.6 mA test current - defines precise regulation point for feedback networks |
| Power Dissipation (PD) | 0.5 W - limits continuous DC power handling; derates linearly above 50 °C ambient |
| Zener Impedance (ZZT) | 41 Ω at IZT = 4.6 mA - determines regulation stability under load transients |
| Reverse Leakage (IR) | 0.1 µA at VR = 20 V - ensures minimal error current in high-impedance reference paths |
| Temp. Coefficient (αVZ) | +0.090 %/°C - quantifies voltage drift over temperature; critical for wide-range accuracy |
| Junction Temp. Range | -65 °C to +175 °C - supports operation in aerospace, industrial, and downhole applications |
| Forward Voltage (VF) | 1.1 V max at 200 mA - defines forward conduction threshold for polarity protection |
Pinout & Package
DO-213AA (SOD80/MLL34) MELF glass package with two end-cap terminals; cathode identified by single band; no internal leads or die attach wires - metallurgical bond directly connects silicon die to metal end caps.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener regulation terminal | Connected to positive side of regulated output; reverse bias required for breakdown operation |
| Anode (unbanded end) | Reference/ground terminal | Typically tied to system ground or feedback node; completes Zener current path |
Key Features
| Feature | Design Value |
|---|---|
| Hermetically sealed MELF construction | Eliminates moisture ingress and long-term parameter drift in humid or corrosive environments |
| Metallurgical die-to-cap bonding | Improves thermal transfer and mechanical robustness vs. wire-bonded alternatives |
| Radiation-hardened per MicroNote 050 | Validated for total ionizing dose (TID) resilience in space and nuclear applications |
| ESD immunity (MIL-STD-750 Method 1020) | Withstands >4 kV HBM without parameter shift - simplifies handling and assembly |
| RoHS-compliant plating (e3 suffix) | Tin-lead or matte-tin end-cap finish compatible with lead-free reflow profiles |
Applications
| Power Supply Feedback Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing output voltage in isolated flyback or forward converter feedback loops using optocoupler-coupled TL431 replacement. IC Role / Device Role / Timing Role: Precision 27 V shunt reference providing stable setpoint for error amplifier comparison. Use Value: Enables ±1% output regulation over line/load/temperature with minimal external components. | Use Scenario: Protecting microcontroller I/O pins from transient surges exceeding 27 V in industrial sensor interfaces. IC Role / Device Role / Timing Role: Fast-acting clamp limiting voltage excursion before damage occurs. Use Value: Absorbs up to 0.5 W surge energy without degradation, preserving downstream logic integrity. |
| High-Temperature Sensor Biasing | Aerospace Voltage Reference |
Use Scenario: Providing stable bias current to RTD or thermistor bridges in engine control units operating at 150 °C ambient. IC Role / Device Role / Timing Role: Temperature-stable 27 V source enabling ratiometric measurement accuracy. Use Value: Maintains <±0.5% voltage deviation from -55 °C to +150 °C due to compensated αVZ. | Use Scenario: Serving as primary voltage reference in satellite power management ICs requiring radiation tolerance. IC Role / Device Role / Timing Role: Radiation-hardened Zener establishing golden reference for ADC calibration and LDO trimming. Use Value: Validated TID performance up to 100 krad(Si) per MicroNote 050 ensures mission-critical stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5254B-1 | Same 27 V rating and 5% tolerance, but in axial DO-35 (DO-204AH) package | Requires through-hole PCB layout; higher thermal resistance (RθJA ≈ 500 °C/W) | Select when legacy board compatibility or manual prototyping is prioritized over SMT density |
| BZX55C27 | 27 V, 5% tolerance, 500 mW, but in DO-35 with different ZZT (30 Ω) and αVZ (+0.085 %/°C) | Lower dynamic impedance improves regulation under fast load steps; slightly reduced tempco | Choose for improved transient response where DO-35 mounting is acceptable |
Compared with 1N5254B-1 and BZX55C27, the 1N5254BUR-1 offers superior thermal performance in SMT layouts, guaranteed radiation hardness, and tighter process control for high-reliability programs - making it preferred for space-grade and automotive under-hood designs despite identical nominal voltage.
Availability
1N5254BUR-1 is available at Aetrix Electronics and suitable for power supply feedback references, overvoltage clamping circuits, high-temperature sensor biasing, and aerospace voltage references requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N5254BUR-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 and mixed-signal ICs, discrete devices, and RF solutions for aerospace, defense, and industrial markets.
The 1N52xxBUR-1 series was designed specifically to deliver JEDEC-standard Zener performance in ruggedized, surface-mount MELF packages for mission-critical voltage regulation where hermeticity, radiation tolerance, and thermal stability are mandatory.
FAQ
What is the Zener voltage tolerance for 1N5254BUR-1?
The 1N5254BUR-1 has a nominal Zener voltage of 27 V with a ±5% tolerance, as indicated by the "B" suffix in the part number per Microsemi's nomenclature. This means the actual measured VZ falls between 25.65 V and 28.35 V at 4.6 mA test current and 25 °C ambient temperature. The tolerance is guaranteed across the full operating temperature range.
Is 1N5254BUR-1 RoHS compliant?
Yes, the 1N5254BUR-1 is RoHS compliant (e3 suffix), with annealed matte-tin end-cap plating suitable for lead-free reflow soldering. RoHS compliance applies only to commercial-grade versions; MIL-spec variants use tin-lead plating and are not RoHS compliant.
What is the maximum reverse leakage current for 1N5254BUR-1?
The maximum reverse leakage current (IR) for 1N5254BUR-1 is 0.1 µA when tested at 20 V reverse bias (VR) and 25 °C. This ultra-low leakage supports high-impedance reference applications where error current must be minimized, such as in precision ADC bias networks.
Can 1N5254BUR-1 be used in high-temperature environments?
Yes, the 1N5254BUR-1 is rated for junction and storage temperatures from -65 °C to +175 °C. Its DO-213AA package and metallurgical bond enable reliable operation at sustained end-cap temperatures up to 125 °C, provided power dissipation remains within derated limits per Figure 2 in the datasheet.
How does the temperature coefficient affect 1N5254BUR-1 performance?
The 1N5254BUR-1 has a positive temperature coefficient of +0.090 %/°C, meaning its Zener voltage increases by approximately 24.3 mV per °C rise in junction temperature. This predictable drift allows compensation in reference circuits and confirms suitability for applications where monotonic voltage shift is acceptable or correctable.
1N5254BUR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 41 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 21 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
1N5254BUR-1 FAQ
1.How can I place an order for 1N5254BUR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5254BUR-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 1N5254BUR-1 reliable?
The price and inventory of 1N5254BUR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5254BUR-1 is usually 5 days.
3.What payment methods are accepted for 1N5254BUR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5254BUR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5254BUR-1?
1N5254BUR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5254BUR-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 1N5254BUR-1?
For technical support, including 1N5254BUR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5254BUR-1 requirements.
6.How does Aetrix verify that 1N5254BUR-1 is sourced from the original manufacturer or authorized distributors?
All 1N5254BUR-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 1N5254BUR-1 meets industry standards.
7.What is the process for return or replacement of 1N5254BUR-1?
All 1N5254BUR-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5254BUR-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 1N5254BUR-1 part is unused and in its original packaging.
Return procedure for 1N5254BUR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5254BUR-1 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
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